JP2011193587A - Private power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems due to inspection or failure of a private power generation device controller as a master machine or a corresponding private power generation device in a conventional private power generation system. <P>SOLUTION: The private power generation device controllers Crl1, Crl2, ... each sum the outputs of private power generation devices G1, G2, ... corresponding to private power generation device controllers to obtain a load amount, calculate a load sharing amount of a private power generation device corresponding to its own private power generation device controller, calculate a target control amount for controlling the corresponding private power generation device from the present power generator output of the corresponding private power generation device and the calculated load sharing amount of the corresponding private power generation device so that the generator output of the corresponding private power generation device can be the calculated load sharing amount of the corresponding private power generation device, and controls the corresponding private power generation device on the basis of the calculated target control amount so that the corresponding private power generation device can have the load sharing amount of the corresponding private power generation device, thereby controlling the load share. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a private power generation system, and more particularly, to a private power generation system that performs load sharing control with a plurality of private power generation devices that are operated in parallel.

  A private power generation system that supplies power to a load with a plurality of private power generators that are operated in parallel is disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-184933 (Patent Document 1), Japanese Patent Application Laid-Open No. 2006-25496 (Patent Document 2), and the like. Yes.

  As shown in FIG. 7, load sharing control in a conventional private power generation system in which power is supplied to a load by a plurality of private power generators operated in parallel as disclosed in Patent Documents 1 and 2, for example, three private power generators. This is performed by each of the private power generator controllers Crlm, Crls1, and Crls2 of the power generators No.1, No.2, and No.3.

Of the three in-house power generator controllers Crlm, Crls1, and Crls2, one in-house power generator controller Crlm has the function of the master machine, and the other remaining in-house power generator controllers Crls1 and Crls2 have the functions of the slave machines. is doing.
In other words, the private power generator controller Crlm having the function of the master machine determines the target load sharing of the private power generator corresponding to each of the private power generator controllers Crlm, Crls1, and Crls2, and the determined target load sharing amount is determined by the slave machine. The private power generator controllers Crls1 and Crls2 that are slave devices are configured to perform output control of the corresponding private power generator according to the allocated target load sharing amount. .

  Specifically, the private power generator controllers Crlm, Crls1, and Crls2 operate as shown in the operation flow of FIG. 8A corresponds to the operation flow of the private power generation device controller Crlm (master machine) of the private power generation device No. 1, and FIG. 8B corresponds to the operation flow of the private power generation device controller Crls1 of the private power generation device No. 2. Correspondingly, (c) corresponds to the operation flow of the private power generator controller Crls2 of the private power generator No. 3, respectively.

In FIG. 8A, the private power generator controller Crlm (master machine) of the private power generator No. 1 uses the private power generator No. 2 status information (current load share (generator output)) as the private power generator. Received from the controller Crls1 (step STP11),
Furthermore, the private power generator controller Crlm (master machine) receives the status information of the private power generator No. 3 (current load sharing (generator output)) from the private power generator controller Crls2 (step STP12),
After that, the private power generator controller Crlm (master machine) will determine the load sharing amount of all private power generators, including the status information of its own machine (self-supporting private power generator) so that it becomes the load sharing amount determined A control target value for all private power generators is calculated (step STP13).
The private power generator controller Crlm (master machine) calculates the control target value of all private power generators, and then sends the corresponding control target value to the private power generator controller Crls1 corresponding to private power generator No. 2 (step) STP14),
Furthermore, the private power generation device controller Crlm (master machine) transmits the corresponding control target value to the private power generation device controller Crls2 corresponding to the private power generation device No. 3 (step STP15),
The private generator controller Crlm (master machine) outputs a control command corresponding to the control target value of the private machine to the private machine (private power generator No. 1) (step STP16).
After that, the private power generator controller Crlm (master machine) checks the status (generator output) of its own machine (in-house power generator No. 1), while the output of its own machine (in-house power generator No. 1) Control is performed to achieve the control target value (step STP17).

In FIG. 8B, the private power generator controller Crls1 (slave machine) of the private power generator No. 2 is the status information (current load sharing amount (generator output)) of the private machine (private power generator No. 2). Is transmitted to the private power generator controller Crlm (master machine) of the private power generator No.1 (step STP21),
In addition, the private power generator controller Crls1 (slave machine) of the private power generator No.2 is the control target of the private power generator (private power generator No.2) from the private power generator controller Crlm (master machine) of the private power generator No.1. Receive the value (step STP22),
Next, the private power generator controller Crls1 (slave machine) of the private power generator No. 2 outputs a control command corresponding to the control target value of the own machine to the own machine (private power generator No. 2) (step STP23).
After that, the private power generator controller Crls1 (slave machine) checks the status (generator output) of its own machine (private power generator No.2), and the output of its own machine (private power generator No.2) Then, control is performed so as to achieve the control target value assigned by the private power generator controller Crlm (master machine) of the private power generator No. 1 (step STP24).

In FIG. 8C, the private power generator controller Crls2 (slave machine) of the private power generator No. 3 is the status information (current load sharing amount (generator output)) of the private machine (private power generator No. 3). Is transmitted to the private power generator controller Crlm (master machine) of the private power generator No.1 (step STP31),
In addition, the private power generator controller Crls2 (slave machine) of the private power generator No. 3 is the control target of the private power generator (private power generator No. 3) from the private power generator controller Crlm (master machine) of the private power generator No. 1. Receive the value (step STP32),
Next, the private power generator controller Crls1 (slave machine) of the private power generator No. 3 outputs a control command corresponding to the control target value of the private machine to the own machine (private power generator No. 3) (step STP33).
After that, the private power generator controller Crls2 (slave machine) checks the status (generator output) of its own machine (private power generator No. 3), and the output of its own machine (private power generator No. 3) Then, control is performed so as to achieve the control target value assigned by the private power generator controller Crlm (master machine) of the private power generator No. 1 (step STP34).

  As described above, in the conventional private power generation system, one private power generation device controller Crlm among the private power generation device controllers of the plurality of private power generation devices operated in parallel is used as a master device, and the remaining private power generation device controllers are used. Using Crls1, Crls2,... As slave machines, the private power generator controller Crlm as the master machine is the corresponding private power generator No.2, No. from the private power generator controller Crls1, Crls2,. Collect status information (current shared load (generator output)) of .3, ..., and use the collected status information (current shared load (generator output)) Each unit (each one) to calculate the load sharing amount of all units (all private power generation devices) for the current load, including the state information (current sharing load amount (generator output)) The control target value of the power generation device) is calculated and determined, and the determined control target value is determined by the private power generation device controller Crlm, which is the master device, with respect to the private power generation device controllers Crls1, Crls2,. The private power generator controllers Crls1, Crls2,..., Which are slave machines, correspond to the corresponding self-power generator No. according to their own control target values determined and transmitted by the private power generator controller Crlm which is the master machine. It is configured to control 2, No. 3, ....

Japanese Patent Laying-Open No. 2005-184933 (FIG. 1 and description thereof) Japanese Patent Laying-Open No. 2006-25496 (FIG. 1 and description thereof)

Private power generation systems are installed in factories, large-scale buildings, large-scale hospitals, large-scale data centers, etc. The number of private power generation devices ranges from several to several tens, and the number of private power generation controller controllers for private power generation devices The number of in-house power generators is also a rule. Moreover, a private power generation device and its private power generation device controller are additionally installed in accordance with the increase in scale.
The private power generator controller, which is the master machine, needs to be a controller that can handle additional installations, and is the controller that plays a central role in load sharing control in the private power generation system. Since not only the private power generation apparatus but also all other private power generation apparatuses, it is necessary to monitor the abnormality more strictly than other private power generation apparatus controllers that are slave machines.
The private power generator controller, which is a master machine, is equipped with an advanced self-diagnosis function, and periodic inspections need to be performed more frequently than other private power generator controllers, which are slave machines.
As described above, the conventional private power generation system, in particular, the private power generation system that performs load sharing control with a plurality of private power generators that are operated in parallel is, as described above, of each private power generator controller of the plurality of private power generators that are operated in parallel. One private power generator controller Crlm is a master machine, and the other private power generator controllers Crls1, Crls2,... Are slave machines, and the private power generator controller Crlm, which is the master machine, is a private power generator. Equipment controller Crls1
, Crls2, ... collects status information (current shared load (generator output)) of their corresponding private power generators No.2, No.3, ..., and collects the collected status information (current Load of all units (all private generators) with respect to the current load, including the status information (current shared load (generator output)) Calculate and determine the control target value of each unit (each private power generation device) to calculate the shared amount and make it the load shared amount, and determine the determined control target value as the private power generator controller Crlm that is the master machine Are transmitted to the slave power generator controllers Crls1, Crls2,..., And the slave power generator controllers Crls1, Crls2,... Are transmitted by the master power generator controller Crlm. Determined and sent self Because it is configured to control the corresponding private power generators No.2, No.3, etc. according to the target value, the master machine can be used when checking the private power generator controller that is the master machine or when it is abnormal. Not only will it not be possible to operate a private power generator controller in a steady state, but it will also be impossible to operate other private power generator controllers that are slave units, or load sharing control will not be performed, resulting in an imbalance between the load amount and the power generation amount. Problems arise.

  The present invention has been made in view of the above-described circumstances, and in a private power generation system that performs load sharing control with a plurality of private power generation devices operating in parallel, the private power generation device that is a master machine in a conventional private power generation system The purpose is to eliminate problems based on inspections and abnormalities of the controller or the corresponding private power generator.

A private power generation system according to the present invention includes a plurality of private power generation devices that are connected to a load via the load bus by respectively connecting a generator main circuit to a load bus and being operated in parallel, and these private power generation devices. A self-power generation device controller that inputs a detection signal of the voltage and current of the generator main circuit of the corresponding self-power generation device provided corresponding to each of the self-power generation device, any of the self-power generation device controller of the corresponding self-power generation device The current generator output of the corresponding private power generator obtained from the voltage and current of the generator main circuit is transmitted to each other private power generator controller, and each of the private power generator controllers corresponds to the corresponding private power generator controller. Calculate the load amount by totaling the output of the power generators and the load sharing amount of the corresponding private power generators of each private power generator controller Any of the in-house power generator controllers, the generator output of the corresponding in-house power generator is calculated from the current generator output of the in-house power generator and the calculated load sharing amount of the in-house power generator. A target control amount for controlling the corresponding private power generation device is calculated so as to be a load sharing amount of the corresponding private power generation device, and any of the private power generation device controllers is adapted to the corresponding private power generation based on the calculated target control amount. It is an in-house power generation system that performs load sharing control by controlling the corresponding in-house power generation device so that the apparatus has the calculated load sharing amount of the in-house power generation device.

  The present invention corresponds to each of a plurality of private power generators each connected to a load via the load bus when the generator main circuit is connected to the load bus and operated in parallel. Provided with a private power generator controller that inputs detection signals for the voltage and current of the generator main circuit of the corresponding private power generator, and any of the private power generator controllers is configured to The current generator output of the corresponding private power generator obtained from the voltage and current is transmitted to each other private power generator controller, and each of the private power generator controllers outputs the output of the corresponding private power generator of each private power generator controller. The total amount of load is obtained and the load sharing amount of the corresponding private power generator of each private power generator controller is calculated. Any of the controllers can calculate the load of the corresponding private power generator from which the generator output of the corresponding private power generator is calculated based on the current generator output of the corresponding private power generator and the calculated load sharing amount of the corresponding private power generator. A target control amount for controlling the corresponding private power generation device so as to become a shared amount is calculated, and any of the private power generation device controllers is configured to calculate the corresponding private power generation device based on the calculated target control amount. Since it is a private power generation system that performs load sharing control by controlling the corresponding private power generation device so that it corresponds to the load sharing amount of the corresponding private power generation device, a private power generation system that performs load sharing control with a plurality of parallel private power generation devices , Based on the inspection and abnormality of the private power generator controller that is the master machine in the conventional private power generation system or the corresponding private power generator There is an effect capable of eliminating the adverse effects of the problem of the self-generating apparatus or its corresponding private power generation equipment controller (slave).

It is a figure which shows Embodiment 1 of this invention, and is a figure which shows an example of the system configuration | structure of a private power generation system. It is a figure which shows Embodiment 1 of this invention, and is a schematic diagram which shows an example of information transfer of a private power generation device controller. It is a figure which shows Embodiment 1 of this invention, and is a figure which shows an example of the internal function of a private power generation device controller. It is a figure which shows Embodiment 1 of this invention, and is a figure which shows an example of the operation | movement flow of each private power generation device controller. It is a figure which shows Embodiment 1 of this invention, and is a figure which shows an example of the communication system which performs information transfer between each private power generation device controller. It is a figure which shows Embodiment 2 of this invention, and is a figure which shows the other example of the communication system which performs information transfer between each private power generation device controller. It is a figure which shows the system configuration | structure of the conventional private power generation system. It is a figure which shows the operation | movement flow of each private power generation device controller of the conventional private power generation system.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is a diagram showing an example of a system configuration of a private power generation system, FIG. 2 is a schematic diagram showing a case of information transmission / reception of a private power generation device controller, and FIG. 3 is a diagram showing an example of internal functions of the private power generation device controller. FIG. 4 is a diagram showing an example of an operation flow of each private power generation device controller, and FIG. 5 is a diagram showing an example of a communication method for exchanging information between private power generation device controllers.

In FIG. 1, a private power generation system includes a load bus BL to which various loads L are connected, and a plurality of private power generation devices No. connected to the load bus BL via a generator main circuit Mc1 and a generator breaker CBg. .1, No.2,... No.n (G1, G2,... Gn) and the corresponding monitoring control target provided individually corresponding to each private power generator G1, G2,. The private power generator controller No. which outputs the various control commands Ci1, Ci2,... Cin to the private power generator to be monitored and controlled by inputting the output state information of the private power generator of the current transformer CT and the instrument transformer VT. 1, No. 2,... No. n (Crl 1, Crl 2,... Crln) and status information of the corresponding private power generators to be monitored and controlled by the respective private power generator controllers Crl 1, Crl 1,. Is composed of a communication line CL, which is a transmission medium for transmitting and receiving each of the private power generator controllers Crl1, Crl2,.
For simplicity of explanation, only two self-power generation devices and self-power-generation device controllers are shown, self-power-generation devices ... No.n (Gn), self-power-generation device controllers ... Crln are not shown. is there.

  The in-house power generator controllers Crl1, Crl2,... Crln are the same products, and all have the same configuration and the same functions, and as shown in FIG. , Synchronous input control unit Crlb, own generator load sharing calculation control unit Crlc, own generator output quantity input / output unit Crld, other generator output state information input unit Crle, and each generator rated storage unit Crlf is doing.

The start / stop control unit Crla is a functional unit that controls start and stop of the corresponding private power generation device.
The synchronous input control unit Crlb is a functional unit that controls synchronous input when a corresponding private power generator is installed in parallel.
The self-generator load sharing calculation control unit Crlc is based on the current output status information, failure information, and maintenance information of the corresponding self-power generation devices obtained from all other self-power generation device controllers. A target for calculating the load sharing amount of each private power generator in steady operation including output status information, and controlling the corresponding private power generator so that the corresponding private power generator generates power corresponding to the shared load amount. It is a functional unit that calculates a control amount (difference between a shared load amount of its own corresponding private power generation device and a current power generation amount).
The self-generator output quantity input / output unit Crld is a current transformer CT connected to the generator main circuit Mc1 of the self-supporting private power generator, and information on the output voltage and output current of the self-supporting private power generator. It is a functional unit that inputs from the output of a current detector such as a transformer VT or a voltage detector.
The other generator output state information input unit Crle is a functional unit that inputs current output state information, failure information, maintenance information, and the like of the corresponding private power generation device from other all private power generation device controllers via the communication line CL. It is.
Each generator rated storage unit Crlf is a function that stores in advance the generator rated output value of the self-supporting self-generating device and all other self-generating devices, that is, all the self-generating devices of the self-generating system, prior to load sharing control. Part. In addition, although the generator rated output value of all private power generation devices may be input in advance, each private power generation device controller receives the generator rated output of each corresponding private power generation device from other private power generation device controllers. Those who collect the values can flexibly and accurately respond to changes in the system scale, etc., and the collection may be input together with the current output status information, failure information, maintenance information, etc. of the private power generator, Information may be input separately.

FIG. 2 shows an example of a schematic diagram of information exchange between the three private power generator controllers Crl1, Crl2, and Crl3. As illustrated in FIG. 2, each of the private power generator controllers Crl1, Crl2, and Crl3 is Information on the current output state of the own machine (self-supported private power generator) is transmitted to other private power generator controllers via the communication line CL, and each private power generator controller Crl1, Crl2, Crl3 is connected. It receives information on the current output status of all private power generators and the rated output value.
Thus, the information exchanged between the private power generator controllers Crl1, Crl2, and Crl3 is only the output state signal and the rated output value of the private power generator, and control system signals such as the control target value and the control command value. And control system data is not exchanged via communication.

Hereinafter, the operation of each private power generation device controller No. 1, No. 2,... No. n (Crl1, Crl2,... Crln) will be described with reference to FIG.
(A) in FIG. 4 corresponds to the operation flow of private power generator controller No. 1 (Crl 1) of private power generator No. 1 (G1), and (b) is private power generation of private power generator No. 2 (G2). This corresponds to the operation flow of the device controller No. 2 (Crl2), and (c) corresponds to the operation flow of the private power generation device controller No. 3 (Crl3) of the private power generation device No. 3 (G3).

In FIG. 4A, the private power generation device controller Crl1 of the private power generation device No. 1 obtains the state information (current load sharing amount (generator output)) of its own machine (private power generation device No. 1) Send to all private power generator controllers Crl2 and Crl3 (step ST11),
Furthermore, the private power generator controller Crl1 of the private power generator No. 1 is the status information of the private power generator No. 2 from the private power generator controller Crl2 of the private power generator No. 2 (current load sharing amount (generator output)). (Step ST12)
Furthermore, the private power generation device controller Crl1 of the private power generation device No. 1 receives the state information of the private power generation device No. 3 from the private power generation device controller Crl3 of the private power generation device No. 3 (current load sharing amount (generator output)). (Step ST13)
After that, the private power generator controller Crl1 of the private power generator No. 1 includes the state information of the output of all private power generators (including the state information of the output of the self-powered private power generator No. 1). Determine the load sharing amount of your own private power generator (No.1), and calculate the control target value of your own machine (your own private power plant No.1) so that it becomes this determined load sharing amount (step ST14).
Next, the private power generator controller Crl1 of the private power generator No.1 matches the control target value of the private machine (self-supported private power generator No.1) with the own machine (self-supported private power generator No.1). A control command is output (step ST15).
After a predetermined time from the end of the processing in step ST15, the private power generator controller Crl1 of the private power generator No. 1 confirms the state (generator output) of its own machine (self-supported private power generator No. 1). Control unit No. 1 (self-supporting private power generation device No. 1) so that the output reaches the control target value and the calculated load sharing amount of the own unit (self-supporting private power generation device No. 1) (Step ST16).
When the process in step ST16 ends, the process returns to step ST11 to perform the above-described operation, and thereafter the operation is repeatedly executed. These operations are performed automatically.

In FIG. 4B, the private power generation device controller Crl2 of the private power generation device No. 2 receives the state information (current load sharing amount (current load amount) (from the private power generation device controller Crl1 of the private power generation device No. 1). Generator output))) (step ST21)
In addition, the private power generator controller Crl2 of the private power generator No. 2 uses the status information (current load sharing (generator output)) of the own machine (private power generator No. 2), and all other private power generator controllers. Send to Crl1, Crl3 (step ST22),
Furthermore, the private power generation device controller Crl2 of the private power generation device No. 2 receives the state information of the private power generation device No. 3 from the private power generation device controller Crl3 of the private power generation device No. 3 (current load sharing amount (generator output)). (Step ST23)
After that, the private power generator controller Crl2 of the private power generator No. 2 includes the state information of the output of the private power generator (self-supported private power generator No. 2) from the state information of the output of all private power generators ( Determine the load sharing amount of your own private power generation device (No.2) and calculate the control target value of your own machine (your own private power generation device No.2) so that it becomes this determined load sharing amount (step) ST24).
Next, the private power generator controller Crl2 of the private power generator No. 2 matches the control target value of the own machine (own self power generator No. 2) with its own machine (self self power generator No. 2). A control command is output (step ST25).
After a predetermined time from the end of the processing in step ST25, the private power generator controller Crl2 of private power generator No. 2 confirms the state (generator output) of its own machine (self-supported private power generator No. 2). Control unit No. 2 (self-supporting self-power generation device No. 2) so that its output reaches the control target value and becomes the load sharing amount of the self-machine (self-supporting self-power generation device No. 2) calculated above (Step ST26).
When the process in step ST26 is completed, the process returns to step ST21 to perform the above-described operation, and thereafter the operation is repeatedly executed. These operations are performed automatically.

In FIG. 4 (c), the private power generator controller Crl3 of the private power generator No. 3 receives the state information (current load sharing amount (current load) (from the private power generator controller Crl1 of the private power generator No. 1). Generator output))) (step ST31)
Furthermore, the private power generation device controller Crl3 of the private power generation device No. 3 receives the status information of the private power generation device No. 2 from the private power generation device controller Crl2 of the private power generation device No. 2 (current load sharing amount (generator output)). (Step ST32)
Furthermore, the private power generator controller Crl3 of the private power generator No. 3 uses the status information (current load sharing (generator output)) of the own machine (private power generator No. 3), and all other private power generator controllers. Send to Crl1, Crl2 (step ST33),
Thereafter, the private power generator controller Crl3 of the private power generator No. 3 includes the output status information of the own machine (self-powered private power generator No. 3), and outputs of all private power generators No. 1 to No. 3. The load sharing amount of the own machine (self-supporting private power generation device No. 3) is determined from the state information of the vehicle, and the own machine (self-supporting private power generation device No. 3) is controlled so as to become the determined load sharing amount A target value is calculated (step ST34).
Next, the private power generator controller Crl3 of the private power generator No. 3 matches the control target value of the private machine (self-supported private power generator No. 3) with its own machine (self-supported private power generator No. 3). A control command is output (step ST35).
After a predetermined time from the end of the processing in step ST35, the private power generator controller Crl3 of private power generator No. 3 confirms the state (generator output) of its own machine (self-supported private power generator No. 3). Control unit No. 3 (self-supporting self-power generation device No. 3) so that its output reaches the control target value and becomes the load sharing amount of the above-mentioned self-powered device (self-supporting self-power generation device No. 3) (Step ST36).
When the process in step ST36 ends, the process returns to step ST31 to perform the above-described operation, and thereafter the operation is repeatedly executed. These operations are performed automatically.

  As described above, the information exchanged between the private power generation device controllers Crl1, Crl2, and Crl3 is only the output state signal of the private power generation device, and the control target value between the private power generation device controllers Crl1, Crl2, and Crl3. And information on control command values is not exchanged.

  In addition, if the said information between each private power generation device controller Crl1, Crl2, Crl3 is exchanged by the half-duplex communication system illustrated in FIG. 5, for example, the reliability can be ensured.

In addition, private power generator controller No.1 (Crl1) confirms the output state of its own machine (private power generator No.1) (step ST16) and then outputs the output state data of its own machine (private power generator No.1). A signal is transmitted (step ST11).
Private power generator controller No.2 (Crl2) receives the transmission data of private power generator controller No.1 (Cll1) (step ST21), and triggers the output state of its own machine (private power generator No.2). A data signal is transmitted (step ST22).
Private power generator controller No.3 (Crl3) receives the transmission data of private power generator controller No.2 (Crl2) (step ST32), and triggers the output state of its own machine (private power generator No.3). A data signal is transmitted (step ST33).

Each private power generator controller collects the output status information of all of the private power generator controllers connected to the load bus BL Crl1, Crl2,... Crln, and then the control target of its own machine (self-supported private power generator) The value is calculated and a control command is output to the own machine (self-supporting private power generator). The private power generator operates in accordance with the control command and the output state changes, and the private power generator controller confirms the changed output state of the own machine (self-supporting private power generator).
The private power generator controller No. 1 (Cll1) confirms the changed output state (step ST16), and then transmits a data signal of the output state of the own machine (private power generator No. 1) (step ST11).
Private power generator controller No.2 (Crl2) confirms the changed output state (step ST26) and then receives the data signal of the output state of the other private power generator No.1 (step ST21). A data signal of the output state of the power generator No. 2) is transmitted (step ST22).
The private power generator controller No. 3 (Crl3) receives the data signal of the output state of the other private power generators No. 1 and 2 after confirming the changed output state (step ST36) (step ST31).
, 32), a data signal of the output state of the own machine (in-house power generator No. 3) is transmitted (step ST33).

IDNo. (No.1, No.2, No.3) is not necessarily a serial number. For example, in FIG.
If No. is a missing number, the operation of No. 3 in (c) is as follows. After receiving the No. 1 transmission data (step ST31), the transmission of No. 2 transmission data in step ST32 even if a predetermined waiting time has elapsed. If not received, No. 2 is judged as a missing number, the No. 2 outgoing data reception process (step ST32) is skipped, and the private power generator controller No. 3 (Crl3) is assigned to the own power generator (corresponding private power generator). The data signal of the output state No. 3) is transmitted (step ST33).
In the case of skipping the processing step in the case of the ID No. missing number, in order to determine whether it is missing from the beginning or if it could not be detected due to a communication error, if it is intentionally missing (when power is shut down due to maintenance etc.) It can be realized by sending a maintenance start signal before turning off the power and enabling each of the private power generation device controllers not subject to maintenance to recognize the private power generation device controller (or private power generation device) that is the maintenance target, Even if the private power generation device controller (or the private power generation device) is faulty or abnormal, it can be similarly dealt with by transmitting a signal indicating the failure or abnormality.
Also, if each private power generator controller calculates "Number of connected units" = "Number of connected units given in advance"-"Number of units that sent maintenance start signal" and information for the number of connected units cannot be received, communication error If an alarm is issued as described above, it is possible to monitor a communication abnormality between the private power generator controllers.

  In the first embodiment, each private power generator controller has information on the rated output of each of its own private power generator and other private power generators, and does not exceed the rated output of the private power generator. The load sharing amount is calculated within the range. Further, the load sharing control is performed so that the output frequency of the private power generator becomes a predetermined frequency.

When supplying power from multiple private power generators to the load connected to the load bus via the generator main circuit and generator breaker, various loads are connected to the load bus. Accordingly, it is necessary to control the output (voltage, current) of the private power generator, and in order to operate the private power generator connected in parallel efficiently, the load to be connected is shared in a balanced manner by each private power generator. In this embodiment, as described above, each of the private power generator controllers No.1, No.2,... No.n (Crl1, Crl2,... Crln) performs the complete autonomous distributed control. Take the role by doing.

  Here, when each private power generator controller is No.1, No.2, No.3 (that is, three private generators No.1, No.2, No.3 are operated in parallel) The case of load sharing control will be explained using specific numerical values.

Private power generator No.1, No.2, No.3 rated output (also called rated capacity) are all 2000kW, private power generator No.1, No.2, No.3 current output is 1000kW, Assuming 1200 kW and 1400 kW, all of the private power generator controllers No. 1, No. 2, and No. 3 perform the following arithmetic processing.
(1) The current total power (that is, the current total load) is calculated from the received generator output.
Total power = 1000kW + 1200kW + 1400kW = 3600kW
(2) Since the rated output ratio of private power generators No.1, No.2, No.3 is 1: 1: 1,
Calculate the load share of private power generator No.1, No.2, No.3 by the ratio of the rated output ratio,
Derive the load sharing amount = 1200kW (target value) for private power generators No.1, No.2, and No.3.
(3) A target control amount is calculated from the derived load sharing amount and the current output of the corresponding private power generator.
Private power generator controller No.1 derives 1200kW-1000kW = 200kW.
Private power generator controller No.2 derives 1200kW-1200kW = 0kW.
Private power generator controller No.3 derives 1200kW-1400kW = -200kW.
(4) Based on the derived target control amount, a control command is output to the corresponding private power generator.
The private power generator controller No.1 has a 200kW output compared to the corresponding private power generator No.1.
A control command for ascending is issued.
In-house power generator controller No. 2 has the same output as the load sharing amount (target value) derived from the corresponding in-house power generator No. 2, so the corresponding in-house power generator No. 2 that relies on load sharing control. It does not control. However, control is performed to keep the output frequency of the corresponding private power generator constant. Other private power generator controllers also perform control to keep the output frequency of the corresponding private power generator constant.
Private power generator controller No. 3 issues a control command to lower the output by 200 kW to the corresponding private power generator No. 3.

When the private power generator No.1 enters the manual operation mode due to maintenance instead of the automatic operation mode by the private power generator controller, the output of the private power generator No.1 in the manual operation mode is unstable. Load sharing control is performed only with private power generators No.2 and No.3 in operation mode.
If the total power just before entering the manual operation mode is 1000kW + 1200kW + 1400kW = 3600kW,
(1) Since the rated output ratio of private power generators No.2 and No.3 is 1: 1,
Calculate the load share of private power generators No.2 and No.3 by the ratio of the rated output ratio,
Calculate the load sharing of private power generation devices No. 2 and No. 3 = 1300kW (target value).
(2) The target control amount is calculated from the derived load sharing amount and the current output of the corresponding private power generator.
Private power generator controller No.2 derives 1300kW-1200kW = 100kW.
Private power generator controller No.3 derives 1300kW-1400kW = -100kW.
(3) Based on the derived target control amount, a control command is output to the corresponding private power generator.
Since the private power generator controller No. 1 is in the manual operation mode, the control output to the corresponding private power generator No. 1 is not output, and the corresponding private power generator No. 1 maintains an output of 1000 kW.
The private power generator controller No.2 has an output of 100kW compared to the corresponding private power generator No.2.
A control command for ascending is issued.
The private power generator controller No.3 has a 100kW output compared to the corresponding private power generator No.3.
Issue a descent control command.

  As described above, in the present embodiment, a plurality of private power generators each connected to a load via the load bus by the generator main circuit being connected to the load bus and being operated in parallel, and these private power generators. Each of the power generators includes a power generator controller provided to input a detection signal for the voltage and current of the generator main circuit of the corresponding power generator, and each of the power generator controllers corresponds to a corresponding power generator. The current generator output of the corresponding private power generator obtained from the voltage and current of the generator main circuit is transmitted to each other private power generator controller, and each of the private power generator controllers is connected to each private power generator controller. Calculate the load share by calculating the load amount by adding the output of the corresponding private power generator and calculating the load share of the corresponding private power generator of each private power generator controller In any of the private power generator controllers, the generator output of the corresponding private power generator is calculated from the current generator output of the compatible private power generator and the calculated load sharing amount of the corresponding private power generator. A target control amount for controlling the corresponding private power generation device is calculated so as to be a load sharing amount of the corresponding private power generation device, and any of the private power generation device controllers is adapted to the corresponding private power generation based on the calculated target control amount. The load sharing control is performed by controlling the corresponding private power generation apparatus so that the apparatus has the calculated load sharing amount of the corresponding private power generation apparatus.

  Therefore, the conventional master unit is unnecessary, and all of the private power generator controllers are in an independent and independent state, facilitating system restoration by shutting off the power for maintenance, restoring from the maintenance state, and adding. Has merit. In addition, even if one unit fails, there is an advantage that the failure does not spread to other units and risk distribution is possible. Furthermore, in the case of a conventional master / slave system, it may be unclear at the beginning of product shipment which of a number of private power generator controllers will be selected as the master machine, in which case all private power generators Although it is necessary to add the control capability of the master unit to the controller, in this embodiment, the control amount is the same for all private power generation device controllers, and the control processing amount becomes a uniform burden. Without the addition, it is possible to reduce the required maximum control capability of the private power generator controller, and the chance of failure of the private power generator controller is reduced.

Embodiment 2. FIG.
In the first embodiment described above, if the information between the private power generation controller controllers Crl1, Crl2, and Crl3 is exchanged by, for example, the half-duplex communication method illustrated in FIG. However, if the full duplex communication method is used as shown in FIG. 6, the reliability is further improved.

  In addition, in each figure, the same code | symbol shows the same or an equivalent part.

G1, G2 private power generator,
CT current transformer,
VT instrument transformer,
CBg generator breaker,
Ci1, Ci2 control command,
Crl1, Crl2 private power generator controller,
CL, CL1, CL2 communication line,
Mc1 generator main circuit,
BL load bus,
L load,
Crla start / stop controller,
Crlb synchronous input control unit,
Crlc self-generator load sharing calculation control unit,
Crld own generator output quantity input / output unit,
Cle other generator output status information input,
Crlf Each generator rated storage section.

Claims (4)

A generator main circuit is connected to a load bus and operated in parallel, so that a plurality of private power generators connected to a load via the load bus, respectively, and a corresponding one of these private power generators. A private power generator controller that inputs detection signals for the voltage and current of the generator main circuit of the private power generator;
Any of the private power generator controllers transmit the current generator output of the corresponding private power generator obtained from the voltage and current of the generator main circuit of the corresponding private power generator to each other private power generator controller,
Each of the private power generation device controllers calculates the load sharing amount of the corresponding private power generation device of each private power generation device controller while calculating the load amount by totaling the outputs of the private power generation devices corresponding to each private power generation device controller,
Each of the private power generator controllers is configured such that the generator output of the corresponding private power generator is calculated from the current generator output of the compatible private power generator and the calculated load sharing amount of the corresponding private power generator. Calculate the target control amount to control the corresponding private power generator so that it becomes the load sharing amount of the power generator,
Any of the private power generator controllers is configured to control the load by controlling the corresponding private power generation device so that the corresponding private power generation device becomes the calculated load sharing amount of the corresponding private power generation device based on the calculated target control amount. In-house power generation system with shared control. The private power generation system according to claim 1,
A private power generation system, wherein the private power generation device is excluded from the load sharing control when the private power generation device or the private power generation device controller is at least one of being inspected, in an accident, or in manual operation. The private power generation system according to claim 1 or 2,
Each private power generator controller holds information on the rated output of each of its own private power generator and other private power generators, and calculates the load sharing within a range not exceeding the rated output of the private power generator An in-house power generation system characterized by In the private electric power generation system as described in any one of Claims 1-3,
The private power generation system, wherein the load sharing control is performed so that an output frequency of the private power generation device is a predetermined frequency.

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