JP2009148098A - System, method, and program for performing distribution line automatic control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform recovery from an accident by taking into consideration the reserve power capacity of distributed power sources as well as surely detecting a distribution line accident of a loop-shaped distribution system linked with the distributed power sources. <P>SOLUTION: In a system 1 for performing distribution line automatic control, the equipment information of the loop-shaped distribution system 20 linked with the distribution power sources is fetched by a communication means to monitor and control the loop-shaped distribution system. This system includes: an accident section detecting means 21 for determining whether or not power transmission can cover a whole range by reclosing at one place by additionally considering a transmission range during the reclosing and a range transmittable from each distributed power source when the accident occurs in the loop-shaped distributed system linked with the distributed power sources, deciding the transmission range by adjustment of the amount of power generation when the power transmission can not cover the whole range, and locating an accident section of the loop-shaped distribution line linked with the distributed power sources by cutting power off again through execution of the reclosing; an interchange procedure formation means 22 for forming an interchange procedure to transmit power to a sound power interruption section by taking into consideration the amount of the power generation of the distributed power sources when the accident section is located; and a system recovering means for restoring the system to the loop-shaped distribution state before the accident, in the accident removal according to this formed interchange procedure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a distribution line automatic control system having a distribution line accident recovery function for monitoring and controlling a loop distribution system connected to a distributed power source, and a distribution line automatic control method and program.

  In general, Japan's power distribution system is constructed radially from the main system through the distribution substation, and basically, distribution line accident recovery is carried out on the assumption that there is only a load on the distribution line.

  FIG. 8 shows a radial distribution line automatic control having a function of detecting a fault section when a distribution line fault occurs in a system that monitors and controls using a voltage type switch (hereinafter referred to as a voltage type distribution system). It is a figure which shows the structure of a system.

  As shown in FIG. 8, the distribution line automatic control system 1 captures information and controls control information on distribution devices such as the distribution circuit breaker on and off state and the voltage type switch opening and closing state for the radial distribution system 10. The control and control means 11 for outputting the power, the state grasping means 12 for judging the charge / power failure state of the distribution system based on the power distribution device information captured by the monitor control means 11, and the state grasping means 12 The switch state capturing means 13 that captures the state of the voltage type switch in the range that was transmitted from the distribution line in which the accident occurred before the accident as needed, and the voltage type switch that is captured by the switch state capturing means 13 From the information on the switch, search for the switch that has been locked due to no voltage during the detection time limit, and detect the fault section of the radial distribution line that judges the load side of the voltage type switch to be the fault section 14 and when the state grasping means 12 determines that an accident has occurred, the accident section 15 is disconnected from the system, and a power transmission operation (hereinafter referred to as interchanged power transmission) is performed on a power outage section other than the accident section. It comprises interchange procedure creation means 16 for creating an interchange power transmission procedure for a power outage section other than the accident section based on the control of the switch, and a pre-accident system restoration means 17 for restoring the system state before the accident after the accident section is restored.

  In addition, since the voltage type switch in a blackout section cannot be controlled, it is necessary to control sequentially from the power supply side.

  Here, the supervisory control unit 11 receives the distribution device information from the radial distribution system 10, and when there is a device state change (hereinafter referred to as a state change) due to a difference from the previously received information, the monitoring control unit 11 goes to the state grasping unit 12. Notify the status change. Moreover, the monitoring control means 11 sends out a control signal to the power distribution equipment which comprises the radial power distribution system 10 by a control request.

  The state grasping unit 12 performs charging / discharging determination of the distribution system and determination of occurrence of an accident based on the distribution device information notified from the monitoring control unit 11. When the state grasping unit 12 determines that an accident has occurred, the state grasping unit 12 notifies the switch state capturing unit 13 of the occurrence of the accident, and after a certain period of time has elapsed since the occurrence of the accident, the accident section detecting unit 14 determines the accident section. Make a request.

  Based on the notification from the state grasping means 12, the switch state capturing means 13 searches for a switch in the range where power was transmitted from the distribution line where the accident occurred before the accident, and for the searched switch, A request for status acquisition is requested to the monitoring control means 11 and the result of status acquisition is received via the status grasping means 12.

  In response to the fault section detection request from the state grasping means 12, the fault section detection means 14 of the radial distribution line searches for the voltage switch in the lock-on state from the information on the voltage type switch taken in, and the voltage type switch The load side of the device is determined as the accident section, and the accident processing means 15 is notified of the accident section detection result.

  The accident processing means 15 requests the monitoring control means 11 for a control request for separating the accident section and a control request for performing flexible power transmission to the healthy power outage section, and receives the control result via the state grasping means 12.

  The accommodation procedure creation means 16 creates an accommodation procedure for a healthy power outage section in response to a request from the accident processing means 15 and notifies the accident processing means 15 of the result (see Patent Document 1).

  In recent years, the introduction of distributed power sources, which are new energy sources such as solar, wind, and fuel cells, has progressed due to various factors such as environmental issues, economics, and policies, and these distributed power sources have already become part of the distribution system. Accident recovery methods that are interconnected and take into account distributed power sources are being studied (see, for example, Patent Documents 2 to 5).

Concepts such as microgrids, demand system, Flexible Reliable and Intelligent Energy Delivery Systems (FRIENDS), and Virtual Power Plant have been created as forms of new distribution systems using these distributed power sources. These network configurations are different from commercial networks, and it is assumed that a small-scale power supply system will be constructed with distributed power sources and will always be operated in a loop form. Examination and actual verification such as degree. (For example, see Non-Patent Documents 1 to 4)
Japanese Patent Publication No. 03-034292 JP 2005-117787 A JP 2006-068885 A JP 2006-094611 A JP2007-028769 Hayashi, Kawasaki, Matsuki, Wakao, Baba, Kitashino, Yokoyama, Kobayashi, Hirai, Ikuishi: “Cooperative operation of distribution systems corresponding to the introduction and expansion of distributed power sources”, IEEJ Transactions B, Vol. 127, no. 1, pp. 41 (2007) Shiki, Yokoyama, Baba, Takano, Goda, Izumi: “Autonomous distributed supply and demand control by distributed power supply groups using inverters in a single microgrid”, IEEJ Transactions B, Vol. 127, no. 1, pp. 95 (2007) Kakuda, Nishioka, Noro, Shinohara, Ito, Yabuki, Kawakami: “Examination of independent operation of microgrid using new energy generator”, IEEJ Transactions B, Vol. 127, no. 1, pp. 145 (2007) Sasaki, Kita, Tanaka, Hasegawa: “Study on the effects of introduction and operation of distributed power supply on economy and supply reliability”, IEEJ Transactions B, Vol. 127, no. 1, pp. 183 (2007)

  The fault section detection process in the distribution line fault recovery method of the conventional distribution line automatic control system described above assumes a radial system configuration, recloses the distribution line circuit breaker (hereinafter referred to as FCB), The accident section was specified by the FCB re-closing and re-closing circuit generated by the timed sequential function of the switch.

  However, in the system configuration that is operated in the always-loop form assumed in a microgrid or the like, if each FCB implements reclosing, the reclosing cannot be tuned and the accident section cannot be detected correctly.

  FIG. 9 is a distribution system diagram constructed in a constantly looped state using a distributed power source as a power source.

  9, G11 to G13 are distributed power sources, FCB11 to FCB13 are distribution line circuit breakers linked to the respective feeders on the distributed power sources G11 to G13 side, and S1 to S9 are distribution lines linking FCB11 and FCB12. The normally closed switches S10 to S15 are provided with an appropriate interval between them, and the normally closed switches S10 to S15 are normally closed with an appropriate interval provided between the normally closed switches S3 and S4 and the FCB 13 It is a switch.

  Here, it is assumed that each normally closed switch (hereinafter simply referred to as a switch) S1 to S15 is operated in a loop, and a slave station capable of time-sequential transmission in both directions is installed. .

  In the power distribution system having such a configuration, when an accident occurs in the section between the switch S2 and the switch S3, the switch S10 is in the X time waiting state by the timed sequential function of the FCB 13 in the conventional fault section detection. At this time, when the switch S10 is shut off again by the timed sequential function of the FCB 12, the switch S10 is turned on, and the section surrounded by the switches S10 and S11 in the turned-on lock state is erroneously determined as the accident section. Resulting in. This is because the switch S10 shuts off again when the time sequential transmission from the FCB 12 to the switch S3 is faster than the time sequential transmission from the FCB 13 to the switch S10.

  In the past, the amount of power that could supply all of the distribution lines from one FCB was guaranteed, so it was guaranteed that there was a power transmission capacity to the end by reclosing, but in the case of microgrids, etc. Therefore, there is no guarantee that power can be transmitted from one distributed power source to all sections of the distribution line.

  On the other hand, when carrying out power transmission to a healthy power outage section other than the accident section, if a distributed power source is connected to the accident distribution line in the commercial system, the power outage section is set in the sound power outage section to prevent isolated operation of the distributed power source. A distributed power source to be connected is disconnected.

  However, since a network including a group of distributed power sources such as a microgrid increases supply troubles when the distributed power source is disconnected, an interchange system in a state where the distributed power sources are operated in parallel is necessary.

  The present invention is made to solve the above-mentioned problems, and it is possible to reliably detect a distribution line accident in a loop distribution system in which distributed power sources are connected and to recover from an accident in consideration of the reserve power of the distributed power source. An object of the present invention is to provide a highly reliable distribution line automatic control system, a distribution line automatic control method, and a program that can be performed.

  In order to achieve the above object, the present invention provides an automatic distribution line control system having a distribution line fault recovery function for monitoring and controlling a loop distribution system connected to a distributed power source by the following means, and a distribution system. This is an electric wire automatic control method.

  The present invention relates to facility information that holds on / off state information of distribution line circuit breakers of a distributed distribution power source, distribution state of circuit breakers, switch state information of switches, switch attributes, and connection information between distribution sections. In a distribution line automatic control system that takes in equipment information such as power generation output information of distributed power sources through communication means and monitors and controls the loop power distribution system, an accident occurred in the loop power distribution system connected to the distributed power sources In this case, it is determined whether or not the entire range can be transmitted with one reclosing, taking into account the transmission range at the time of reclosing and the transmission possible range from each distributed power source. The accident range detection means for determining the fault section of the looped distribution line that is connected to the distributed power source by re-cutting by reclosing, and the fault section is specified by this fault section detection means. If this is the case, an accommodation procedure creation means for creating an accommodation procedure for transmitting power to a healthy power outage section in consideration of the power generation amount of the distributed power source, and a loop distribution before the accident in the accident removal according to the accommodation procedure created by the accommodation procedure creation means It is characterized by comprising a loop-like system restoration means for restoring the system.

  In addition, the present invention can be connected to a commercial system via a connection line, and is normally connected independently as a single system. In the distribution line automatic control system that takes in equipment information such as switch information and distribution section mutual connection information, equipment information such as power generation output information of the distributed power source by monitoring means, and monitors and controls the micro grid system, Accident determination means for determining an accident occurring in the microgrid, and an accident section detection means for detecting an accident section of a loop distribution line connected to a distributed power source when the occurrence of the accident is recognized by the accident determination means, When the accident section is identified by this accident section detection means, power is transmitted to the section for accident recovery considering the distributed power source, and the single accident recovery in the microgrid If there is a supply hindrance, it is determined whether there is a supply hindrance when power is transmitted to the area subject to accident recovery using the lending procedure creation means for creating a lending procedure for implementation and the accommodation procedure created by this accommodation procedure creation means. Includes a reserve power confirmation means for confirming the reserve power on the commercial system side, and a restoration operation procedure creation for creating a restoration operation procedure by performing a flexible calculation using the reserve power of the commercial system confirmed by the reserve power confirmation means And a recovery operation procedure execution means for executing the recovery operation procedure created by the recovery operation procedure creation means, and early transmission of power to a healthy power outage section other than the accident section when a grid fault occurs in the microgrid, It is characterized by minimizing supply problems.

  Furthermore, the present invention provides a computer, a turn-on / off state information of a distribution line circuit breaker of a loop distribution system linked to a distributed power source, an open / close state information of a switch, an attribute of the switch and connection information between distribution sections. If an accident occurs in a loop-type power distribution system connected to a distributed power source using equipment information such as facility information holding the power source and information on the power generation output of the distributed power source, the power transmission range at the time of reclosing and each distributed power source Judging whether the entire range can be transmitted in one reclosing cycle, taking into account the possible transmission range from the power source, if the entire range cannot be transmitted, determine the transmission range by adjusting the amount of power generation, and reclosing Accident section detection means for identifying the fault section of a looped distribution line that is connected to a distributed power source by re-interruption, and soundness considering the power generation amount of the distributed power source when the fault section is specified by this fault section detection means Power transmission to power outage section A program for functioning as a loop-like pre-accident system restoration means for restoring a loop-type power distribution system before an accident in accident removal according to the accommodation procedure created by the accommodation procedure-creating means. Is to provide.

  Further, the present invention can connect a computer to a commercial system via a connection line, and is always operated independently as a single system. Accident determination means for determining an accident occurring in the microgrid using device information such as switching state information, switch attributes and facility information holding connection information between distribution sections, and power generation output information of the distributed power source When the accident determination means recognizes the occurrence of the accident, the accident section detecting means for detecting the accident section of the loop distribution line connected to the distributed power source, and the accident section is specified by the accident section detection means An interchange procedure creation means for creating an interchange procedure for implementing a single accident recovery within the microgrid by transmitting power to the accident recovery target section considering distributed power sources, and this interchange procedure A reserve capacity check means for determining whether or not there is a supply failure when power is transmitted to the accident recovery section in the interchange procedure created by the means, and if there is a supply failure, Perform recovery operation procedure creation means that creates a restoration operation procedure by performing accommodation calculation using the reserve capacity of the commercial system confirmed by the reserve capacity confirmation means, and a restoration operation procedure created by this restoration operation procedure creation means A program for functioning as a recovery operation procedure execution means is provided.

  According to the present invention, a highly reliable distribution line automatic capable of reliably detecting a distribution line accident in a loop-type distribution system in which distributed power sources are connected and performing an accident recovery in consideration of the reserve power of the distributed power source A control system and a distribution line automatic control method and program can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1 to 5 and 9.

  FIG. 1 is a block diagram showing a first embodiment for explaining a distribution line automatic control system and distribution line automatic control method according to the present invention. The same parts as those in FIG. The detailed explanation is omitted.

  In FIG. 1, a distribution line automatic control system 1 for monitoring and controlling a loop distribution system connected to a distributed power source using a voltage type switch is connected to a loop distribution system 20 connected to a distributed power source. On the other hand, the supervisory control means 11 for fetching information on the power distribution equipment such as the on / off status of the distribution line breaker and the open / close state of the voltage type switch and the output of control information, and the power distribution taken into the supervisory control means 11 The state grasping means 12 for judging the charging / discharging state of the distribution system based on the device information, and the voltage type in the range in which power was transmitted before the accident from the distribution line where the accident occurred when the state grasping means 12 determined that the accident occurred. Based on the information of the switch-type state capturing means 13 for capturing the state of the switch as required and the voltage type switch captured by the state grasping means 12, the fault section of the loop distribution line connected to the distributed power source is determined. The accident section detecting means 21 to be disconnected, the state grasping means 12 determines that an accident has occurred, the accident section is disconnected from the system, and the accident processing means 15 for performing power transmission to the power outage section other than the accident section, and the distributed power source An interchange procedure creation means 22 that considers a distributed power source that creates an interchange transmission procedure for a power outage section other than the accident section on the premise of parallel operation and voltage type switch control, and a loop system before the accident after the accident section is restored It is comprised from the system recovery means 23 before the loop-like accident to recover, and these are implement | achieved by computer processing.

  FIG. 2 is a block diagram showing the configuration of the fault section detecting means 21 of the loop-shaped distribution line connected to the distributed power source.

  In FIG. 2, the fault section detection means 21 for the loop-shaped distribution line connected to the distributed power source includes the pre-accident system information 100, the FCB on / off state information 101, the accident information 102, and the switch state stored in the memory, respectively. Information 103, facility information 104, distributed power generation output information 105, distributed power transmission range determination unit 200, FCB reclosing priority determination unit 201, distributed power generation output adjustment unit 202, FCB reclosing in the system before the accident The execution command unit 203 and the accident section detection unit 204 are configured.

  FIG. 3 is a block diagram showing a configuration of the accommodation procedure creation means 22 considering a distributed power source.

  In FIG. 3, the accommodation procedure creation means 22 considering the distributed power source includes switch state information 103, facility information 104, distributed power generation output information 105, accommodation target system information 106, and distributed type respectively stored in the memory. The power generation output adjustment unit 202, a reserve power calculation unit 205 considering a distributed power source, and a healthy power failure section restoration unit 206 are configured.

  FIG. 4 is a diagram for explaining an example of reserve power calculation in consideration of the distributed power source of the reserve power calculation unit 205 in consideration of the distributed power source in FIG.

  FIG. 5 is a block diagram showing the configuration of the loop-like pre-accident system recovery means 23. As shown in FIG.

  In FIG. 5, the loop-like pre-accident system restoration means 23 includes pre-accident system information 100, FCB on / off state information 101, accident information 102, switch state information 103, facility information 104, distributed power source, which are stored in the memory, respectively. The power generation output information 105, the post-accident system information 107, the accident cause removal unit 207 in the accident section, the power transmission unit 208 to the accident removal section, the switchback operation execution unit 209, and the system state check unit 210 are configured.

  Next, the operation of the distribution line automatic control system configured as described above will be described with reference to FIGS. 1 to 5 and FIG. 9.

  When an accident occurs in the section surrounded by the switch S2 and switch S3 of the distribution system shown in FIG. 9, in the distribution line automatic control system 1, the state grasping means 12 takes the loop-shaped power distribution taken into the monitoring control means 11. The first interruption of FCB1, FCB2, and FCB3 is detected from the information of the distribution equipment of the system 20, and the information is given to the accident detection means 21 of the loop distribution line connected to the distributed power source.

  In the fault detection means 21 of the loop distribution line connected to the distributed power source, the distributed power transmission range determination unit 200 in the pre-accident system shown in FIG. The switch state information 103 and the facility information 104 are read from the memory, and the supply range in each distributed power source is specified from the load in the power transmission range before the accident and the power generation amount of the distributed power source.

  The FCB reclosing priority determining unit 201 reads the distributed power generation output information 105 from the memory, and extracts FCBs that can transmit the entire range by reclosing the FCB at one location. At that time, when the FCB that transmits the entire range cannot be extracted with only one FCB, the distributed power generation output adjustment unit 202 can generate the power of the distributed power source so that the entire range can be transmitted with one FCB. The power generation output is adjusted so as to be output, and the FCB reclosing priority determination unit 201 again extracts FCBs that can transmit the entire range by one FCB.

  If the target FCB cannot be extracted even if the distributed power generation output adjustment unit 202 increases the power generation output of the distributed power source, the FCB reclosing priority determination unit 201 determines whether the reserve power of the distributed power source The FCB re-closing order is determined from the priority according to the order in which the amount of power outage decreases due to power transmission in the circuit.

  Further, the FCB reclosing execution command unit 203 that has received the FCB reclosing execution request reads the accident information 102 and the facility information 104 from the memory, and executes the FCB reclosing extracted by the FCB reclosing priority determination unit 201. To do. However, when a plurality of FCBs are extracted, the reclosing of each FCB is sequentially performed according to the priority order.

  In addition, the accident section detection unit 204 reads the accident information 102 and the switch state information 103 from the memory, and inputs the time limit from the power source side to the switch adjacent to the accident section by the FCB reclosing operation by the FCB reclosing execution command unit 203. Then, the switch on the power supply side adjacent to the accident section detects the switch that has been locked by the slave station function, and the load-side section of the switch is determined as the accident section, and the accident shown in FIG. The accident section detection result is notified to the processing means 15.

  The accident processing means 15 requests the monitoring control means 11 for a control request for separating the accident section and a control request for performing flexible power transmission to the healthy power outage section, and receives the control result via the state grasping means 12.

  When the accommodation procedure creation means 22 considering the distributed power source receives a request for creating the accommodation procedure from the accident processing means 15 to the healthy power failure section, the reserve capacity calculation unit 205 considering the distributed power source shown in FIG. The power generation output information 105 and the interchange target system information 106 are read from the memory to calculate the reserve capacity at the interconnection point.

  Conventionally, the reserve force by the accommodation procedure creation means 16 in FIG. 8 is calculated from the difference between the capacity of each switch and the current passing current in each switch, and the smallest reserve force in the path of the interchange source distribution line is calculated. As reserve power. Therefore, the reserve power of the distributed power source cannot be considered.

  Taking FIG. 4 as an example, in the conventional case in which the reserve power of the distributed power source is not taken into account, the reserve power of the normally closed switch S21 is 20A, which is the minimum, so that the normally opened switch S25 that is the interconnection point is used. The reserve power is 20A.

  On the other hand, in the reserve power calculation of the reserve power calculation unit 205 in consideration of the distributed power source shown in FIG. 3, when the distributed power source is connected on the path of the interchangeable distribution line, the distributed power source is connected. This is calculated by adding the reserve power of the distributed power source to the reserve power that is minimum on the power source side from the section in which the system is connected.

  FIG. 4 shows an example of the calculation of the reserve power by the reserve power calculator 205 considering the distributed power source. G11, G12, and G13 are distributed power sources, FCB11, FCB12, and FCB13 are circuit breakers. S24 is a normally closed switch and S25 is a normally open switch (hereinafter simply referred to as a switch).

  First, the reserve power of the distributed power source is calculated from the difference between the current power generation amount and the power generation amount that can generate the maximum power output by reading the distributed power generation output information by the distributed power generation output adjustment unit 202 shown in FIG. In this case, the calculation of the maximum power generation output takes into account factors related to the power generation output adjustment of various distributed power sources, such as the energy cost required for the operation of the distributed power source and the state of heat and natural environment.

  In FIG. 4, the minimum reserve force from the FCB 11 to the switch S22 is 20A. Since the distributed power source G12 is linked to the section between the switch S22 and the switch S23, the minimum reserve force 20A up to the switch S22 and 20A that is the reserve force of the distributed power source G2 are added, and 40A Increased to reserve power.

  Next, since the distributed power supply G13 is also linked to the section between the switch S23 and the switch S24, 10A, which is the reserve capacity of the distributed power supply G13, is added to the reserve power 40A up to the switch S23. The reserve power of the switch S24 is increased to 50A. The reserve power 50A up to the switch S24 considering the distributed power source does not exceed 60A, which is the capacity of the switch S25 serving as the connection point, and therefore the reserve power at the connection point is calculated as 50A.

  The healthy power failure section restoration unit 206 shown in FIG. 3 creates a procedure for accommodation to the healthy power failure section using the reserve power calculated by the reserve power calculation unit 205 considering the distributed power source, and the result is shown in FIG. Notify the accident handling means 15 shown.

  On the other hand, the pre-loop accident system restoration means 23 removes the accident factor by the human system based on the post-accident system information 107 and the accident information 102 by the accident cause removal unit 207 of the accident section shown in FIG. Power is transmitted from the power transmission unit 208 to the power outage section where the accident is removed.

  In addition, the switchback operation execution unit 209 confirms that all the power outage sections are gone from the FCB input / cutoff information 101, the switch state information 103, and the facility information 104, and creates an operation procedure for returning to the power transmission form before the accident. Execute. In the case of a loop system in which distributed power sources are connected in the system before the accident, the power status calculation is performed by the system status check unit 210 based on the switch state information 103, the facility information 104, and the distributed power generation output information, Check voltage, current, loop cross current, etc. As a power flow calculation method for the distribution system, there is, for example, Japanese Patent Application Laid-Open No. 2006-246683.

  Here, it is as follows when the distribution line accident recovery method in consideration of the above distributed power sources is described.

(1) In reclosing for accident section determination, reclosing is performed by taking into account the power transmission range at the time of reclosing and the power transmission range from each distributed power source.

(2) As a result of the above (1), when the entire range cannot be transmitted in one reclosing circuit, the power generation amount is adjusted and the transmission range is determined.

(3) As a result of the above (2), when the entire range cannot be transmitted by one reclosing, reclosing from a plurality of locations is performed.

(4) The circuit is reclosed by the processes (1) to (3), and the accident section is specified by re-blocking.

(5) When transmitting power to the healthy power outage range, take into account the power outage load and power generation amount, adjust the power generation amount, and minimize the inoperability.

(6) When switching back to the system before the accident, if power was transmitted from multiple distributed power sources prior to the accident, the loop cross current was calculated to restore the form, and relay malfunction and equipment protection were avoided. Carry out system operation in consideration.

  As described above, according to the first embodiment, when an accident occurs in the loop power distribution system in which distributed power sources are linked by the accident section detecting means 21, the transmission range at the time of reclosing and the power from each distributed power source are Determine whether or not the entire range can be transmitted in one reclosing cycle, taking into account the possible transmission range. If the entire range cannot be transmitted, determine the transmission range by adjusting the power generation amount. When the entire transmission range cannot be transmitted by one reclosing as the transmission range, the fault section of the loop distribution line connected to the distributed power source by re-blocking by reclosing is specified from multiple places Therefore, it becomes possible to prevent an error in detecting an accident section and to reduce supply trouble by creating an accommodation procedure considering the reserve capacity of the distributed power source by the accommodation procedure creating means 22 considering the distributed power source. To do The ability. Further, the system recovery means 23 before the loop-like accident can check the system state and protect the power supply equipment when the system is restored to the loop-type distribution system before the accident after the accident is removed.

(Second Embodiment)
Next, a second distribution line automatic control system and distribution line automatic control method that considers interconnection between a system that is always independently operated as a single system (hereinafter referred to as a microgrid) and a commercial system. This embodiment will be described with reference to FIGS.

  FIG. 6 is a system diagram showing a configuration example of a microgrid that is connected to a commercial system via a connection line and is always operated as a single system.

  In FIG. 6, Ga and Gb are distributed power sources. FCBa is connected to a feeder on the distributed power source Ga side, and distribution switches 43a to 43c and interconnection switches 44a are appropriately connected to a distribution line 42a connected to the FCBa. The commercial system AC is connected to the interconnecting switch 44a so as to be interconnected. Further, the distribution lines between the division switches 43a and 43b are branched, and the division switches 43f and 43g and the interconnection switch 44b are provided at an appropriate distance.

  The FCBb is connected to the feeder on the distributed power source Gb side, and the distribution switches 42f and 43g are provided at appropriate distances on the distribution line 42b connected to the FCBb. The switch 43e is connected to the switch 43e by a link switch 44b.

  FIG. 7 is a diagram showing an overall processing procedure in the second embodiment of the present invention applied to the system shown in FIG.

  As in the first embodiment, the distribution line automatic control system includes the monitoring control means 11, the state grasping means 12, the switch taking-in means 13, and the fault section detecting means for the looped distribution line connected to the distributed power source. 21 and an accommodation procedure creation means 22 taking account of the distributed power source are provided, but detailed description thereof is omitted here.

  In the second embodiment, the accident determination means 30, the fault section detection means 21 of the loop distribution line connected to the distributed power source, and the distributed power source that performs the single accident recovery process in the microgrid are considered. It comprises an accident processing means 22, a commercial system side reserve capacity check section 31, a recovery operation procedure creation section 32 using a commercial system reserve capacity, and a recovery operation procedure execution section 33.

  The operation of the second embodiment configured as described above will be described with reference to FIGS.

  In the microgrid system of FIG. 6, when an accident occurs in the section 45a of the distribution line 42a, the accident determination means 30 recognizes that a system accident has occurred and starts the accident recovery process.

  The accident section detecting means 21 of the loop-shaped distribution line connected to the distributed power source determines that the accident section is 45a, and the recovery target sections are the healthy power outage sections 45b, 45c, 45d, 45e, and 45f. decide.

  Next, an accommodation operation is performed from the distribution line 42b by the accommodation procedure creation means 22 considering a distributed power source. Here, it is assumed that the load of each section 45b, 45c, 45d, 45e, 45f is 20A, and the reserve power of the distribution line 42b calculated from the bank allowable current / feeder allowable current and the bank current Ib2 / feeder current If2 is 50A. Then, the distribution line 42b is interchanged with the sections 45e and 45f, and the sections 45b, 45c, and 45d remain as supply troubles (power failure sections).

  In the microgrid alone, no further accident recovery can be performed and supply hindrance remains. Therefore, interchange from the commercial system is performed according to the following procedure.

  Next, the commercial system reserve capacity is determined by the commercial system reserve capacity checking means 31. A method for inputting reserve capacity (or information necessary for calculating reserve capacity) into the system through linkage with the distribution system automatic distribution system control system, and reserve capacity (or information necessary for calculating reserve capacity) There is a method of obtaining and inputting by an operator.

  The reserve power on the commercial system side is calculated from the current (lf3, lb3) of the feeder connected to the microgrid and the bank to which the feeder belongs and its allowable current.

  Next, the interchange operation procedure from the commercial system is created by the restoration operation procedure creation means 32 that uses the reserve power of the commercial system to create the restoration operation procedure by performing the interchange calculation using the reserve capacity of the commercial system.

  By using the reserve power calculated by the reserve power confirmation means 31 on the commercial system side described above, interchange calculation is performed by using the feeder of the linked commercial system as a feeder equivalent to that in the microgrid, and an interchange operation procedure is created.

  However, commercial feeders are treated in the same way as feeders with different upper systems in the current distribution line automatic control system. Here, assuming that the reserve power of the feeder of the commercial system is 70A, a procedure (an opening operation of the switch 44a, an operation of turning on the switch 43c, an operation of turning on the switch 43b) is created from the commercial feeder to the sections 45b, 45c, 45d. .

  Further, the recovery operation procedure execution means 33 for executing the recovery operation procedure executes the operation procedure created by the recovery operation procedure creation means 32 using the reserve power of the commercial system in accordance with a command from the computer system.

  In addition, when using a commercial feeder as a ball feeder, it is necessary to perform a power failure switching or a mechanism for performing synchronous input by matching the frequency, voltage, and phase of the commercial system and the microgrid.

  As described above, according to the second embodiment of the present invention, in the case where supply trouble remains without being able to recover from an accident only within the microgrid, the supply trouble can be minimized by allowing interchange from the commercial system side. .

The block diagram which shows 1st Embodiment of the distribution line automatic control system by this invention. The block diagram which shows the structure of the fault area detection means of the loop-shaped distribution line with which the distributed power source was connected in the embodiment. The block diagram which shows the structure of the accident process means which considered the distributed power supply in door embodiment. Explanatory drawing of the reserve power calculation example in consideration of the distributed power supply in the embodiment. The block diagram which shows the structure of the system recovery means before the loop type system accident in the same embodiment. The system diagram which shows the structural example of the microgrid by which a commercial system is connected and always operates independently as a single system. The figure which shows the process sequence for describing 2nd Embodiment of the distribution line automatic control system by this invention. The block diagram which shows the structure of the distribution line automatic control system with respect to the conventional radial distribution system. Distribution system diagram constructed with a distributed power source as the power source and always built in a loop.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Distribution line automatic control system, 11 ... Monitoring control means, 12 ... State grasping means, 13 ... Switch state acquisition means, 14 ... Radial distribution line accident section detection means, 15 ... Accident handling means, 16 ... Interchange procedure preparation means , 17... Pre-accident system restoration means, 20... Loop distribution system connected to distributed power supply, 21... Fault section detection means for loop distribution line connected to distributed power supply, 22. Consideration of accommodation procedure creation means, 23... Loop-pre-accident system restoration means, 30 .. accident determination processing processing, 31... Commercial system side reserve capacity confirmation means, 32. 33 ... Recovery operation procedure execution means, 100 ... System information before accident, 101 ... FCB on / off state information, 102 ... Accident information, 103 ... Switch state information, 104 ... Equipment information, 105 ... Distributed power generation Force information 106 ... interchange target system information 107 107 post-accident system information 200 200 distributed power transmission range determination unit in the system before the accident 201 201 FCB reclosing priority determination unit 202 202 distributed power generation output adjustment unit , 203... FCB re-closing execution command unit, 204... Accident section detection unit, 205... Reserve power calculation unit considering distributed power source, 206... Healthy power outage section recovery unit, 207. Power transmission unit to the accident removal section, 209 ... switchback operation execution unit, 210 ... system state check unit,

Claims (12)

Discharge power supply circuit breaker on / off status information, switch open / close status information, switch attributes, and facility information that holds connection information between distribution sections, distributed power supply In the distribution line automatic control system that takes in the equipment information such as the power generation output information by the communication means and performs the monitoring control of the loop distribution system,
If an accident occurs in a looped distribution system with distributed power sources connected, can the entire range be transmitted with one reclosing circuit, taking into account the transmission range at the time of reclosing and the power transmission possible range from each distributed power source? If the entire range cannot be transmitted, determine the transmission range by adjusting the power generation amount, and identify the fault section of the loop distribution line connected to the distributed power source by re-cutting by reclosing Accident section detection means, an accommodation procedure creation means for creating a procedure for transmitting power to a healthy power outage section in consideration of the amount of power generated by the distributed power source when the accident section is specified by the accident section detection means, and this accommodation procedure creation means An automatic distribution line control system comprising: a loop-shaped pre-accident system restoration means for restoring the pre-accident loop-shaped power distribution system in the accident removal according to the interchange procedure created in (1). In the distribution line automatic control system according to claim 1,
The fault section detection means of the loop distribution line includes a distributed power transmission range determination unit that identifies a transmission range of each distributed power source in the system before the accident, and a distribution line breaker that preferentially performs reclosing. If the entire range cannot be transmitted by the reclosing priority determination unit of the distribution circuit breaker that performs prioritization and the reclosing of one distribution line circuit breaker, the power transmission range is adjusted by adjusting the power generation amount of the distributed power source. The distributed power generation output adjustment unit to be determined, the reclosing execution command unit that performs reclosing of the distribution line breaker to detect the accident section, and the accident section that identifies the accident section by shutting off the distribution line breaker again An automatic distribution line control system comprising a detection unit. In the distribution line automatic control system according to claim 1,
The interchange procedure creation means considering the distributed power source includes a distributed power generation output adjustment unit that changes the power generation amount of the distributed power source that can adjust the power generation amount when accommodating a healthy power outage section, and a power reserve for the distributed power source. A distribution line automatic control system, comprising a reserve power calculation unit that takes into account and a healthy power outage section recovery unit that performs interchange processing to a healthy power outage section. In the distribution line automatic control system according to claim 1,
The system to restore the system before the loop accident includes the accident cause removal section in the accident section where the cause of the accident is removed by the human system, the power transmission section to the accident removal section that transmits power to the power outage section where the accident has been removed, and all power outages. A switchback operation execution unit that creates and executes an operation procedure to return to the power transmission form before the accident due to the absence of the section, and a system state check unit that checks the frequency, voltage, phase, etc. in the system returned to the system before the accident Distribution line automatic control system characterized by comprising. It can be connected to a commercial system via a connection line, and it is always operated independently as a single system, and the distribution circuit breaker on / off status information, switch open / close status information, switch attributes and In distribution line automatic control system that takes in equipment information such as facility information holding distribution section mutual connection information, power generation output information of distributed power supply by communication means and monitors and controls the micro grid system,
Accident determination means for determining an accident occurring in the microgrid, and an accident section detection means for detecting an accident section of a loop distribution line connected to a distributed power source when the occurrence of the accident is recognized by the accident determination means, When the accident section is specified by the accident section detection means, the power generation procedure creating means for creating a procedure for power transmission to the accident recovery target section in consideration of the distributed power source and performing the single accident recovery in the microgrid, It is determined whether there is a supply hindrance when power is transmitted to the accident recovery target section in the accommodation procedure created by this accommodation procedure creating means, and if there is a supply hindrance, a reserve capacity check is performed to confirm the reserve capacity on the commercial system side. A recovery operation procedure creating means for creating a restoration operation procedure by performing accommodation calculation using the reserve capacity of the commercial system confirmed by the reserve capacity confirmation means, and the restoration operation procedure The recovery operation procedure execution means that implements the recovery operation procedure created by the creation means is provided, and power transmission to a healthy power outage section other than the accident section is performed at an early stage when a grid fault in the microgrid occurs, thereby minimizing supply problems Distribution line automatic control system characterized by that. In the distribution line automatic control system according to claim 5,
The reserve capacity confirmation means on the commercial system side inputs information necessary for calculating reserve capacity or reserve capacity to the system by linking with the distribution line automatic control system of the commercial system, or information necessary for calculating reserve capacity or reserve capacity. The distribution line automatic control system is characterized in that the reserve power on the commercial system side is confirmed by the operator entering the commercial system manager and inputting it. In the distribution line automatic control system according to claim 6,
The restoration operation procedure creation means uses the reserve power confirmed by the reserve power confirmation means on the commercial system side to perform interchange calculation using the feeder of the linked commercial system as an equivalent feeder in the microgrid. Distribution line automatic control system characterized by creating operation procedures. In the distribution line automatic control system according to claim 7,
The distribution line automatic control system, wherein the restoration operation procedure execution means executes the manipulation procedure according to the accommodation procedure created by the restoration operation procedure creation means. Discharge power supply circuit breaker on / off status information, switch open / close status information, switch attributes, and facility information that holds connection information between distribution sections, distributed power supply In the distribution line automatic control method for taking in the equipment information such as the power generation output information by the communication means and monitoring and controlling the loop distribution system,
If an accident occurs in a looped distribution system with distributed power sources connected, can the entire range be transmitted with one reclosing circuit, taking into account the transmission range at the time of reclosing and the power transmission possible range from each distributed power source? If the entire range cannot be transmitted, determine the transmission range by adjusting the power generation amount, and identify the fault section of the loop distribution line connected to the distributed power source by re-cutting by reclosing Accident section detection step, an interchange procedure creation step for creating an accommodation procedure for transmitting power to a healthy power outage section in consideration of the power generation amount of the distributed power source when the accident section is identified by this accident section detection step, and this accommodation procedure creation step A distribution line automatic control method comprising: a loop-shaped pre-accident system restoration step for restoring the pre-accident loop-shaped power distribution system in accident removal according to the interchange procedure created in step (1). It can be connected to a commercial system via a connection line, and it is always operated independently as a single system, and the distribution circuit breaker on / off status information, switch open / close status information, switch attributes and In the distribution line automatic control method for monitoring and controlling the micro grid system by taking in equipment information such as facility information holding distribution section mutual connection information, power generation output information of distributed power sources by communication means,
An accident determination step for determining an accident occurring in the microgrid, and an accident section detection step for detecting an accident section of a loop distribution line connected to a distributed power source when the occurrence of the accident is recognized by the accident determination step; When the accident section is identified by this accident section detection step, an accommodation procedure creation step for creating a accommodation procedure for carrying out the single accident recovery in the microgrid by transmitting power to the accident recovery target section in consideration of the distributed power source, It is determined whether there is a supply failure when power is transmitted to the accident recovery target section in the accommodation procedure created in this accommodation procedure creation step, and if there is a supply failure, a reserve capacity check is performed to confirm the reserve power on the commercial system side Step and a restoration operation procedure using the reserve capacity of the commercial system confirmed in the reserve capacity confirmation step to create a restoration operation procedure It includes an operation procedure creation step and a recovery operation procedure execution step that implements the recovery operation procedure created in this recovery operation procedure creation step, and early transmission of power to healthy power outage sections other than the accident section when a grid fault occurs in the microgrid An automatic distribution line control method characterized by being implemented and minimizing supply problems. Computer
Discharge power supply circuit breaker on / off status information, switch open / close status information, switch attributes, and facility information that holds connection information between distribution sections, distributed power supply Using device information such as power generation output information of
If an accident occurs in a looped distribution system with distributed power sources connected, can the entire range be transmitted with one reclosing circuit, taking into account the transmission range at the time of reclosing and the power transmission possible range from each distributed power source? If the entire range cannot be transmitted, determine the transmission range by adjusting the power generation amount, and identify the fault section of the loop distribution line connected to the distributed power source by re-cutting by reclosing Accident section detection means, an accommodation procedure creation means for creating a procedure for transmitting power to a healthy power outage section in consideration of the amount of power generated by the distributed power source when the accident section is specified by the accident section detection means, and this accommodation procedure creation means A program for functioning as a loop-type pre-accident system restoration means to restore the pre-accident loop-type power distribution system in accident removal according to the interchange procedure created in step 1. Computer
It can be connected to a commercial system via a connection line, and it is always operated independently as a single system.Distribution / breaking state information of distribution line circuit breakers, switching state information of switches, switch attributes and By using equipment information such as facility information that holds connection information between distribution sections and power generation output information of distributed power sources,
Accident determination means for determining an accident occurring in the microgrid, and an accident section detection means for detecting an accident section of a loop distribution line connected to a distributed power source when the occurrence of the accident is recognized by the accident determination means, When the accident section is specified by the accident section detection means, an accommodation procedure creation means for creating a accommodation procedure for carrying out the single accident recovery in the microgrid by power transmission to the section for accident recovery considering the distributed power source, It is determined whether there is a supply hindrance when power is transmitted to the accident recovery target section in the accommodation procedure created by this accommodation procedure creating means, and if there is a supply hindrance, a reserve capacity check is performed to confirm the reserve capacity on the commercial system side. Means, a recovery operation procedure creating means for creating a restoration operation procedure by performing accommodation calculation using the reserve capacity of the commercial system confirmed by the reserve capacity confirmation means, and the restoration operation procedure Program for functioning as a restoration operation procedure means for executing a recovery operation procedure that was created in step creation means.

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