KR101918625B1 - System and method for providing power service to a plurality of customers using an energy storage device - Google Patents

Abstract

According to the present invention, disclosed are a system for providing power services to a plurality of consumers using an energy storage device and a method thereof. According to an embodiment of the present invention, the system for providing power services to a plurality of consumers using an energy storage device includes: a photovoltaic power generation module for generating electric energy using solar light, an energy storage system (ESS) for storing the electric energy produced by the photovoltaic power generation module; a controller for controlling the movement of the electric energy produced by the photovoltaic power generation module and the movement of the electric energy stored in the ESS; and a customer group selection unit for analyzing the load pattern of a customer on the basis of information of the provided customer and selecting a customer group including a plurality of customers as a load side to which the electric energy stored in the ESS is supplied.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a system and method for providing a power service to a plurality of customers using an energy storage device,

The present invention relates to a system and method for providing power services to a plurality of customers using an energy storage device, and more particularly to a system and method for providing power services to a plurality of customers using a single energy storage device System and method.

An energy storage system (ESS) is a device that stores electrical energy and uses it when needed to improve energy utilization efficiency and stabilize the power supply system. Generally, ESS is used to prevent large power outages in areas where power consumption is concentrated during the summer or where many factories are densely populated. Especially in areas where power plants are frequently used, such as large industrial complexes, it is necessary to use ESS to prevent blackouts and lower electricity rates.

The conventional ESS is a method of supplying electric power stored in the ESS during the day in which electric power is consumed at a low cost and the electric power is relatively low at the night, It is mainly used as a method of generating electricity in daytime with solar energy using renewable energy and mixing it with grid power.

As such, ESS needs to spread to various types of customer groups (industrial complex, commercial building, apartment house, etc.) due to its various advantages, but low operating profit and high initial investment cost are factors that impede the spread of ESS . Therefore, new value creation methods are emerging using ESS.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a system and method for providing a plurality of cus- tomer services using a single ESS, including a peak cut service, a PQ service, A system and method for providing power services to a plurality of customers using an energy storage device capable of providing power services.

It is another object of the present invention to provide an energy storage device capable of increasing the operating efficiency of an ESS by constructing a group of power service provision target customers based on power consumption trends of a plurality of customers, A system and method for providing power services.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided an ESS (Energy Storage System) for storing electric energy produced by the solar power generation module, And analyzing the load pattern of the customer based on the information of the controller and the provided customer to control the movement of the electric energy produced by the solar power generation module and the movement of the electric energy stored in the ESS, There is provided a system for providing a power service to a plurality of customers using an energy storage device, comprising a customer group selection unit for selecting a customer group including a plurality of customers as a load side to be supplied.

In one embodiment of the present invention, the controller includes: a solar PCS having a solar inverter for converting the DC electric energy produced by the solar PV module into an AC electric energy form; A plurality of load side PCSs for transmitting the electric energy to the load side and for blocking the electric energy of the load side from moving to the ESS side, and a plurality of load side PCSs for transmitting the alternating electric energy to the ESS, And an ESS PCS having a bi-directional inverter to transmit the bi-directional inverter.

In one embodiment of the present invention, the solar PCS further comprises a solar energy meter for measuring an amount of electric energy produced by the solar power generation module, wherein the load side PCS is a quantity of electric energy delivered to the load side And the ESS PCS may further include an ESS meter for measuring an amount of electrical energy stored in the ESS and an amount of electrical energy supplied to the ESS.

In one embodiment of the present invention, the system further comprises a power system for supplying external grid power, wherein the electric energy stored in the ESS may be transferred to the power system via the bi-directional inverter by the controller to be transmitted to the outside .

In one embodiment of the present invention, the customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer based on the information of the provided customer, and determines the type of customer according to the analysis result, Use cus- tomer, and the group of cus- tomers may be formed to include one or more regular power-consuming cus- tomer and irregular power-consuming cus- tomers.

In one embodiment of the present invention, the customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer based on the information of the provided customer, and according to the analysis result, Use consumer and a specific time zone high power use consumer, wherein the group of consumers is formed to include one or more weekly high power consumption consumers and night high power consumption consumers, or one or more daytime constant power use consumers and a specific time period high power use consumer .

In one embodiment of the present invention, the pre-provided information of the consumer is at least one of the type of the consumer, the maximum power usage of the consumer, the minimum power usage of the consumer, the power usage time of the consumer, the location of the consumer, Or more.

In one embodiment of the present invention, the controller receives the desired service information corresponding to one of the peak cut service, the PQ service, and the UPS service from each of the plurality of customers, and uses the electric energy stored in the ESS And provide a service according to the desired service information to each of the plurality of customers.

In one embodiment of the present invention, based on the target demand power information of the plurality of customers, the generation amount information of the solar power generation module, the electric energy information stored in the ESS, and the current time information, If the real-time use power of the specific customer is greater than the usage power according to the target demand power information of the specific customer by checking the real-time use power of the customer, the electric energy produced by the solar power generation module or the electricity stored in the ESS Energy can be provided.

In one embodiment of the present invention, when the power generation amount of the photovoltaic power generation module is greater than the usage power of the load side in a predetermined time of day, the controller uses the electric energy produced by the photovoltaic power generation module, And the remaining electric energy can be stored in the ESS.

In one embodiment of the present invention, when the SOC of the ESS becomes equal to or greater than a predetermined ratio as the controller stores the remaining electric energy among the electric energy produced by the solar power generation module in the ESS, And may transmit electrical energy stored in the ESS to the power system via a bi-directional inverter.

In one embodiment of the present invention, when the power generation amount of the photovoltaic power generation module is smaller than the usage power of the load side in a predetermined time of day, the controller stores the electric energy stored in the ESS as a predetermined ratio of the SOC of the ESS The electric energy can be supplied to the specific customer.

According to another aspect of the present invention, there is provided a solar power generation module for generating electric energy using solar light, an ESS (Energy Storage System) for storing electric energy produced by the solar power generation module, A controller for controlling movement of electric energy produced by the solar power generation module and movement of electric energy stored in the ESS, and a customer group selection unit for selecting a service target customer group, An analysis step of analyzing the load pattern of the customer on the basis of the information of the customer provided by the customer group selection unit, a process of analyzing a customer group that forms a customer group including a plurality of customers to be served based on the result of the analysis step Forming a plurality of receptacles, A service providing step of receiving a desired service information and providing a service according to the desired service information to each of the plurality of customers using electric energy stored in the ESS, And provides a method of providing the service.

In another embodiment of the present invention, the analyzing step comprises: Wherein the customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer based on the information of the provided customer and sets the type of the customer to the regular power use customer and the irregular power use customer according to the analysis result, The forming step may be such that the customer group selection unit is configured to include the customer group to include at least one regular power use customer and an irregular power use customer.

In another embodiment of the present invention, the analyzing step comprises: The customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer based on the information of the provided customer and divides the customer into the weekly high power use customer, the night high power use customer, the daytime specific power use customer and the specific time zone high power use customer according to the analysis result Wherein the acceptor group formation step includes forming the acceptance group to include at least one weekly high power use consumer and a night high power use consumer or at least one daytime constant power use consumer and a specific time period high power use consumer As shown in FIG.

In another embodiment of the present invention, the desired service information corresponds to any one of a peak cut service, a PQ service, and a UPS service, and the information of the pre-provided customer may include at least one of a type of the customer, The amount of electric power used, the electric power use time of the consumer, the location of the consumer, and the electric charge of the consumer.

In another embodiment of the present invention, the service providing step may include a step of providing, by the controller, based on target demand power information of the plurality of customers, generation amount information of the solar power generation module, electric energy information stored in the ESS, The real-time use power of the plurality of customers is checked, and if the real-time use power of the specific customer is larger than the usage power according to the target demand power information of the specific customer, the electric energy or the electric energy And providing electrical energy stored in the ESS.

In another embodiment of the present invention, the service providing step may include the step of, when the power generation amount of the photovoltaic power generation module is greater than the usage power of the load side in a predetermined time of day, And storing electric energy remaining in the ESS by supplying electrical energy to the specific customer.

In another embodiment of the present invention, a system for providing power services to a plurality of customers using the energy storage device further comprises a power system for supplying external grid power, The controller may transmit the electrical energy stored in the ESS to the power system to the power system so that the controller can sell the electrical energy stored in the ESS according to the SOC of the ESS.

In another embodiment of the present invention, when the power generation amount of the photovoltaic power generation module is less than the usage power of the load side at a predetermined time of day, the controller transmits the electric energy stored in the ESS to the SOC Discharging the electric power until the predetermined ratio is reached, and supplying electric energy to the specific consumer.

According to the present invention, a single ESS can be used to provide various power services such as peak cut service, PQ service, emergency power generation service, and DR service to a plurality of customers.

Further, according to the present invention, it is possible to increase the operating efficiency of the ESS by grouping the power service provision target customer groups on the basis of the power usage trend of each of the plurality of customers.

In addition, according to the present invention, by charging electric power to the ESS using only solar energy, electric power can be provided to a plurality of customers, and electric power of the remaining ESS can be sold to increase operating profit.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a block diagram illustrating a schematic configuration of a system for providing power services to a plurality of customers using an energy storage device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a detailed configuration and a connection relationship of a system for providing a power service to a plurality of customers using an energy storage device according to an exemplary embodiment of the present invention.
Figure 3 illustrates an example of a consumer load pattern in accordance with various embodiments of the present invention.
4 is a diagram for explaining desired service information according to an embodiment of the present invention.
5 is a flow chart illustrating a procedure of a method for providing power services to a plurality of customers using an energy storage device according to another embodiment of the present invention.
FIG. 6 is a diagram illustrating a detailed procedure of a service providing step of a method of providing a power service to a plurality of customers using an energy storage device according to another embodiment of the present invention.
7 is a diagram illustrating a peak cut service according to various embodiments of the present invention.
8 to 10 are diagrams for explaining a PQ service according to various embodiments of the present invention
11 and 12 are diagrams illustrating UPS services according to various embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Water, equivalents, and alternatives. In order to clearly explain the present invention, parts not related to the description are omitted, and the size, shape, and shape of each component shown in the drawings may be variously modified, and for the same / The same or similar reference numerals are attached thereto.

The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related art is omitted when it is determined that the gist of the embodiments disclosed in the present specification may be blurred.

Throughout the specification, when a part is referred to as being "connected (connected, connected or coupled)" with another part, it is not only when it is "directly connected (connected, (Connection, contact, or combination) "between them. It is also to be understood that when a component is referred to as " comprising ", it is to be understood that it is not intended to exclude other components, .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise, and the components distributed in the present specification may be embodied in a combined form unless otherwise specified. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

1 schematically shows a schematic configuration of a system (hereinafter referred to as " solar energy operating system 100 ") for providing power services to a plurality of customers using an energy storage device according to an embodiment of the present invention. 1 is a block diagram, and FIG. 2 is a diagram illustrating the detailed configuration of the solar energy operating system 100 and its connection relationship.

1 and 2, a solar energy operating system 100 includes a solar power module 110, an ESS 120, a controller 130, and a customer population selection unit 140 .

The solar power generation module 110 generates electric energy using solar light, and may be formed in a form including one or more PV (photovoltaic) modules.

The ESS 120 stores the electric energy produced by the solar power generation module 110 and the controller 130 controls the movement of the electric energy produced by the solar power generation module 110 and the electric energy stored in the ESS 120 Control the movement. The controller 130 may be implemented in a form including a specific component described below and a separate device (e.g., a computer, a smart phone, etc.) for controlling such components.

Specifically, the controller 130 includes a solar power PCS (Power Conversion System) 131 having a solar inverter for converting the DC electric energy produced by the solar power generating module 110 into an AC electric energy form, A plurality of load side PCSs (Power Conversion Systems) 132 having a unidirectional inverter for transmitting the electrical energy stored in the load cell 120 to the load side and blocking the electrical energy of the load side from moving to the ESS 120 side, And an ESS PCS (Power Conversion System) 133 having a bi-directional inverter for transferring the electrical energy stored in the ESS 120 to the outside, to the ESS 120. In addition to the PCSs described above, the controller 130 may further include a main PCS 134 that governs the overall energy transfer of the system. The main PCS 134 may also include an inverter and measure the amount of solar energy generated, the amount of energy transferred to the load side, the amount of energy stored in the ESS or passed to the external power system from the ESS.

In addition, the solar PCS 131 further comprises a solar energy meter for quantifying the amount of electrical energy produced by the solar power generation module 110, and each load-side PCS 132 has an electrical energy meter And the ESS PCS 133 further includes an ESS 120 meter for quantifying the electrical energy stored in the ESS 120 and the amount of electrical energy supplied externally from the ESS 120, .

The customer group selection unit 140 analyzes the load pattern of the customer based on the information of the provided customer and selects a customer group including a plurality of customers as a load side to which the electric energy stored in the ESS 120 is supplied.

More specifically, the customer group selection unit 140 analyzes the load pattern of the hourly customer based on the information of the provided customer, and sets the type of the customer as a regular power user or an irregular power user according to the analysis result , A population of consumers may be formed to include one or more regular power consuming consumers and an irregular power consuming consumer.

In addition, the customer group selection unit 140 analyzes the load pattern of the customer based on the information of the pre-provided customer, and according to the analysis result, the customer type is classified into a weekly high-power user, a night high-power user, Or a specific time of day high power use consumer, and the customer population may be formed to include one or more daytime high power consumption consumers and night high power consumption consumers, or one or more daytime constant power use consumers and a specific time period high power use consumers may be included .

Here, the information of the provided custodians may include at least any one of the type of the customer, the maximum power consumption of the customer, the minimum power consumption of the customer, the power use time of the customer, the location of the customer, and the price of the customer.

3, which illustrates an example of a load pattern of a customer according to an embodiment of the present invention, a customer population selection unit 140 determines whether a customer with high power usage during a weekday, such as load pattern sample A 301, Can be set to the consumer use or the weekly high power use consumer, and the consumer with high power consumption at night time, such as the load pattern sample B (302), can be set to the regular power use consumer or the night high power use consumer. In addition, the customer group selection unit 140 can set the user having a large amount of power consumption in both the load pattern sample C (303) and day and night time zone to the regular power use customer or the day and night constant power use customer, Likewise, consumers with high power usage at specific time periods can be set to irregular power consumers or consumers with high power consumption at specific times.

Thus, by using the solar energy operating system 100, it is possible to increase the operating efficiency of the ESS by grouping the power service provision target customer groups based on the power usage trend of each of the plurality of customers.

Referring again to FIGS. 1 and 2, the solar energy operating system 100 may further include a power system 150 that supplies external grid power. Generally, power system 150 in Korea supplies electric energy provided by KEPCO.

The electrical energy stored in the ESS 120 may be transferred to the power system via the bi-directional inverter by the controller 130 and transmitted to the outside. Accordingly, the solar energy operating system 100 can increase sales revenue by providing services to the customers and selling the remaining electrical energy in the ESS 120 to the power system 150 for sale. In addition, since the unidirectional inverter is installed in the load side receiver, the general electric power used at the load side can not be transmitted to the ESS, and all the electric energy stored in the ESS is due to the solar power generation of the solar power generation module 110, The solar energy management system 100 can be maximized in terms of sales revenue

Referring to FIG. 4, the controller 130 receives the desired service information according to an embodiment of the present invention. The controller 130 receives, from each of the plurality of customers, a peak cut service, a PQ service, and a UPS service And can provide the service according to the desired service information to each of the plurality of customers by using the electric energy stored in the ESS 120. [

The controller 130 is also capable of real-time use of a plurality of receptacles based on the target demand power information of a plurality of customers, the generation amount information of the solar power generation module 110, the electric energy information stored in the ESS 120, The electric power generated by the solar power generation module 110 or the electricity stored in the ESS 120 may be stored in the specific customer when the real-time use power of the specific customer is greater than the usage power according to the target demand power information of the specific customer. Energy can be provided.

In general, the base rate of domestic electricity charges is determined based on the peak value of electrolytic electricity use, so the base rate can be saved by lowering the peak value. For example, when the target customer electric power is set to 1000 KW, the controller 130 checks the electric power of the user A and determines that the electric power of 1000 W is used by the customer A, Or electrical energy stored in the ESS 120. As a result, the customer A can obtain the effect of reducing the base rate of the electric bill. These services are called peak cut services.

Alternatively, when the customer A uses 1000 KW as the peak value, the target reduction power may be set to 200 KW and the target reduction power information may be transmitted to the controller 130. At this time, the controller 130 can provide the power corresponding to the target reduction power to the customers based on the target reduction power information of each of the plurality of receivers. As a result, the effect of lowering the peak value from 1000 KW to 800 KW can be obtained.

When the power generation amount of the solar power generation module 110 is equal to or more than the usage power of the load side in a predetermined weekly time in the peak cut service, the controller 130 uses the electric energy produced by the solar power generation module 110, The electrical energy may be supplied to the customer and the remaining electrical energy may be stored in the ESS 120.

In addition, when the controller 130 stores the remaining electrical energy among the electrical energy generated by the solar power generation module 110 in the ESS 120, the state of charge (SOC) of the ESS 120 becomes a predetermined ratio or more Controller 130 may transmit electrical energy stored in ESS 120 to power system 150 via a bi-directional inverter. As a result, the system operator can increase sales revenues by selling power to the power system. Here, the ratio of the predetermined SOC may be set to 80% or 100%, but the present invention is not limited thereto.

When the power generation amount of the solar power generation module 110 is less than the usage power of the load side in a predetermined weekly time, the controller 130 supplies the electric energy stored in the ESS 120 to the ESS 120 at a predetermined ratio To provide electrical energy to a particular customer, where the ratio of the predetermined SOC may be 20%, but is not limited thereto.

In this manner, when the real-time use power of a specific customer is larger than the usage power according to the target demand power information of a specific customer, the system manager calculates the power generation amount of the solar power generation module 110 It is possible to efficiently determine whether electric energy produced by the solar power generation module 110 is to be supplied to the consumer or the energy stored in the ESS 120 is discharged by using the electric energy generated by the solar power generation module 110 by comparing the usage power of the load.

FIG. 5 is a flowchart illustrating a procedure of a method of providing power services to a plurality of customers using an energy storage device according to another embodiment of the present invention, and FIG. 6 is a flowchart FIG. 3 is a view illustrating a detailed process of a service providing step of a method of providing a power service to a plurality of customers using a device.

Since the method of providing power service to a plurality of customers using the energy storage device according to another embodiment of the present invention is an operation method using the solar energy operating system 100 described with reference to FIGS. 1 to 4, Hereinafter, description overlapping with the above description will be omitted.

Referring to FIG. 5, a method for providing power service to a plurality of customers using the energy storage device according to the present embodiment includes a solar power generation module for generating electric energy using solar light, a solar power generation module ESS (Energy Storage System) for storing the generated electric energy, controller for controlling the movement of electric energy produced by the solar power generation module, movement of the electric energy stored in the ESS, and a group of selecting the customer group (S510) for analyzing the load pattern of the customer based on the information of the customer provided by the customer group selection unit, and a method for operating the solar energy operation system using the plurality of customers A customer population formation step (s520) of forming a customer population including the customer, Of the desired service information being transmitted from suyongga respectively, and a service providing step (s530) for providing a service according to the desired service information using the electric energy stored for each of a plurality of suyongga the ESS.

In the analyzing step (s510), the customer selecting unit analyzes the load pattern of the customer according to the time based on the information of the provided customer, and sets the type of the customer as a regular power user or an irregular power user Step. At this time, the customer population selection step (s520) may be such that the customer group selection unit forms the customer group including at least one regular power use customer and an irregular power use customer.

In addition, the analysis step (s510) The customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer on the basis of the information of the provided customer and analyzes the type of the customer according to the result of the analysis based on the information of the customer who uses high power, And setting it to the use consumer. At this time, the customer group formation step (s520) may be such that the customer group selection unit forms the customer group to include one or more high-power users and high-power users at night, or one or more high- To be included.

Also, the desired service information corresponds to one of a peak cut service, a PQ service, and a UPS service, and the information of the pre-provided customer includes information on the type of the customer, the maximum power consumption of the customer, Time, location of the consumer, and electricity price of the consumer.

Referring to FIG. 6, the service providing step (s530) includes a step of providing the service based on the target demand power information of the plurality of customers, the generation amount information of the solar power generation module, the electric energy information stored in the ESS, The real-time use power of a plurality of customers is checked, and when the real-time use power of the specific customer is larger than the usage power according to the target demand power information of the specific customer, the electric energy or the electric energy produced by the solar power generation module And providing electrical energy stored in the ESS (s610).

In addition, in the service providing step (s530), when the power generation amount of the photovoltaic power generation module is equal to or more than the usage power of the load side in a predetermined weekly time, the controller And the storage process (s621) of storing energy in the ESS and remaining electric energy in the ESS.

In this case, the system for providing power services to a plurality of customers using the energy storage device further includes a power system for supplying external system power, and the service providing step (s530) And a sales process (S622) of transmitting, to the power system, the electric energy stored in the ESS to the power system when the SOC of the ESS becomes a predetermined ratio or more.

Alternatively, the service providing step s530 may be arranged such that when the power generation amount of the photovoltaic power generation module is less than the usage power of the load side in a predetermined time period since the step S610, the controller transmits the electric energy stored in the ESS to the SOC of the ESS (S630) discharging electric power to the specific customer to supply electrical energy to the specific customer.

In addition, the method of providing power service to a plurality of customers using the energy storage device according to the present embodiment may be performed by using all the functions and procedures performed by the solar energy operating system 100 described with reference to FIGS. 1 to 4 .

7 is a diagram illustrating a peak cut service according to various embodiments of the present invention.

As described above, the peak-cut service refers to a service that provides a power value for a difference between a peak value and a target demand power to a customer through an ESS when a peak value higher than the target demand power of the customer occurs.

An embodiment of a method of providing a peak cut service using a solar energy operating system according to an embodiment of the present invention will be described with reference to FIG.

First, the target demand power of N customers is calculated, and the solar power generation amount of the solar power generation module is confirmed. Thereafter, the real-time usage power of N customers is monitored. For example, in the method of providing a peak cut service according to an embodiment of the present invention, if the real time use power P1 of the first customer is larger than the target demand power P1 target of the first customer, the remaining second, ... . We can also compare the real-time usage power (P2, P3, P4, ...) and the target demand power (P2 target, P3 target, P4 target, ...) of each of the customers to determine which customer will provide the peak cut service.

At the end of the selection process, the controller can calculate the amount of solar power generated and the power to be supplied to the customer, and perform the peak cut service considering the SOC of the ESS.

In addition, the method of providing a peak cut service according to the present invention may further include a process of selecting a priority to which power is to be preferentially given to a certain customer. The priority selection process is to provide power to the customer with a big difference between the peak value and the target demand power and to provide the peak cut service to the customer immediately when the SOC of the ESS is 50% or more. However, if the SOC of the ESS is 20% But it is not limited thereto, for example, by increasing the charged amount of the ESS and then providing a peak cut service to the customer. In addition, the method of providing the peak cut service may include a process of providing the peak cut service and allowing the remaining power to be sold to the power system.

8 to 10 are diagrams for explaining a PQ (Power Quality) service according to various embodiments of the present invention. Referring to FIG. 8, a PQ One embodiment of the service providing method will be described.

First, the PQ service providing method checks the solar power generation amount of the PV module and the SOC of the ESS, and monitors the main load voltage and the load current for N customers. This process measures the bus voltages V1, V2, .., Vn of the customer 1, 2, 3 .. to compensate for the voltage dip (instantaneous voltage drop), which is one of the power quality of the corresponding customer, Lt; / RTI >

Next, the method of providing PQ service, if there are differences in the parts sensitive to voltage fluctuation according to the manufacturing industries of each customer, the lower limit value V1 target of each customer, ... Vn target is preliminarily determined to determine whether the bus voltage of the customer is less than or equal to the voltage fluctuation lower limit value and if it is equal to or less than the voltage fluctuation lower limit value, the voltage fluctuation compensation service is performed for the corresponding customer.

The method of providing the PQ service comprises the steps of operating the installed PCS of each customer and raising the PCS rated current value by a predetermined value (for example, 10%) to increase the PCS current value so that the busbar voltage of the customer is above the lower limit of the voltage fluctuation . Thereafter, when the system bus voltage of the corresponding customer returns to a normal state, it is determined whether there is a system abnormality or not, and all procedures of the PQ service providing method can be terminated.

Referring to FIG. 9, when the load of a specific customer is increased (P _load ) in a concentrated area such as an industrial complex, the supply power of the system may become insufficient. At this time, the bus voltage of the system decreases ( V ≤ V _stable ) and the frequency also fluctuates, which may cause a problem in the production facility of the customer.

Therefore, according to the present embodiment, when the voltage compensation is performed through the ESS equipment to a specific customer, if the current is supplemented through the ESS + PCS, there is a margin of the system supply capacity, so that the bus voltage does not fluctuate and the fluctuation of the frequency is also compensated .

Also, when the ground load of the customer is large, the PQ service can also be used to increase the marginal capacity of the system by supplying the phase current through the PCS. This can provide an effect similar to the effect of installing a phase-leading capacitor.

In other words, an increase in the power consumption of a customer located at the end of the grid results in a drop in grid voltage. Therefore, it is the PQ service that compensates the load current through the ESS connected to the customer to reduce the load on the supply current of the system, and the grid voltage becomes stable due to the increase of the margin of the system. It is also meaningful to reduce the apparent current of the system by supplying the phase current through the PCS when the power factor of the customer is the ground power factor.

FIG. 10 shows the effect of improving the power factor of the consumer as described with reference to FIG. As the power factor improves, the line current is reduced from I ₀ to I by In. In this case, the loss of power distribution lines is reduced by the reduced line current, and the power system can be used efficiently.

Referring to FIG. 10, the loss reduction ratio according to the installation of the PCS for the PQ service at the end of the customer is as follows.

의 계산과, 수용가 역률 개선에 따른 선로 전류가 감소하여 배전선로 전압강하가 줄어드는 것을 수식으로 나타내면 아래와 같다(E_R : 수전측 전압, E_S: 송전측 전압 R, X : 선로의 저항 및 리액턴스).When the line resistance is R, the loss reduction ratio

(E _R : receiving side voltage, E _S : transmitting side voltage R, X: resistance and reactance of the line), and the reduction of the voltage drop to the distribution line due to the reduction of the line current due to the improvement of the power factor of the consumer, .

11 and 12 are diagrams for explaining an uninterruptible power supply (UPS) service according to various embodiments of the present invention.

11 is a flowchart showing a case where a UPS service is performed on a critical facility in a customer (ex: computational load).

For example, the solar energy management system according to an embodiment of the present invention may be used to monitor the bus voltage of a customer and automatically perform a switching operation using an automatic transfer switch (ATS) Power can be supplied to the customers through the PCS + ESS of the energy management system.

In addition, the method of providing UPS service using the solar energy operating system according to an embodiment of the present invention is such that when the system is restored, the ATS is returned to use the grid voltage, and the ESS provider and the customer side, And recording the time record and the power record with respect to providing the service for a predetermined time period.

Referring to FIG. 12, the UPS service is a service for minimizing damage to a computer or a microprocessor-incorporated equipment used for office automation equipment (OA) and factory automation equipment (FA) Fig. 12 shows an example of wiring for providing a UPS model.

Referring to FIG. 12, in order to provide a UPS service, a DC link bus of a solar energy operating system according to an embodiment of the present invention may be connected instead of a battery of an existing UPS. Alternatively, when there is no UPS system, It can also be used.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (20)

A photovoltaic module for generating electric energy using solar light;
An ESS (Energy Storage System) for storing electric energy produced by the solar cell module;
A controller for controlling movement of electric energy produced by the solar cell module and movement of electric energy stored in the ESS; And
And a customer group selection unit for analyzing a load pattern of the customer on the basis of the information of the provided customer and selecting a customer group including a plurality of customers as a load side to which the electric energy stored in the ESS is supplied,
The controller comprising:
A solar power PCS (Power Conversion System) having a solar inverter for converting the DC electric energy produced by the solar power generation module into an AC electric energy form; and an electric power conversion system for transferring the electric energy stored in the ESS to the load side, A plurality of load side PCSs (Power Conversion Systems) having a unidirectional inverter that blocks electric energy from moving to the ESS side, and a bidirectional inverter that transmits the AC electric energy to the ESS and transmits the electric energy stored in the ESS to the outside And an ESS PCS (Power Conversion System) having an inverter,
The photovoltaic PCS further comprises a solar energy meter for quantifying the amount of electrical energy produced by the photovoltaic power generation module, and the load side PCS further comprises a load side meter for measuring an amount of electrical energy delivered to the load side The ESS PCS further comprises an ESS meter for measuring an amount of electrical energy stored in the ESS and an amount of electrical energy supplied to the ESS,
Further comprising a power system for supplying external grid power, wherein the electric energy stored in the ESS is transferred to the power system via the bidirectional inverter by the controller and is transmittable to the outside,
The customer group selection unit,
The load pattern of the customer according to the time is analyzed based on the information of the provided customer and the type of the customer is set as the regular power user or the irregular power user according to the result of the analysis or the user uses the day high power user or the high night power Set to a customer, set to a day or night constant power use consumer or a specific time period high power use consumer, and set the customer population to include at least one regular power use consumer and an irregular power use consumer, or one or more weekly high power use consumer and night high power consumption Use cus- tomers, or include at least one daytime constant power usage cus- tomer or a specific time period high power usage cus- tomer,
The information of the provided custody includes at least any one of a type of a customer, a maximum power consumption of the customer, a minimum power consumption of the customer, a power use time of the customer, a location of the customer,
Wherein the controller receives the desired service information corresponding to one of the peak-cut service, the power quality service, and the uninterruptible power supply service from each of the plurality of customers, receives service information corresponding to the desired service information using the electric energy stored in the ESS, To each of the plurality of customers,
The controller comprising:
Real-time use power of the plurality of customers is checked based on target demand power information of the plurality of customers, electricity generation amount information of the solar power generation module, electric energy information stored in the ESS, and current time information, Provides the electric energy produced by the solar power generation module or the electric energy stored in the ESS to the specific customer when the electric power is greater than the electric power used according to the target demand electric power information of the specific customer,
The controller comprising:
When electric power generated by the photovoltaic power generation module is greater than or equal to the usage power of the load side in a predetermined time period, electric energy generated by the photovoltaic power generation module is supplied to the specific customer, And the controller transmits the electric energy stored in the ESS to the power system through the bidirectional inverter when the SOC (State Of Charge) of the ESS reaches a preset ratio,
When the power generation amount of the photovoltaic power generation module is less than the usage power of the load side in a predetermined weekly time, the controller discharges the electric energy stored in the ESS until the SOC of the ESS becomes a predetermined ratio, Wherein the energy storage device is used to provide a power service to a plurality of customers.
delete delete delete delete delete delete delete delete delete delete delete An ESS (Energy Storage System) for storing electric energy produced by the solar photovoltaic module, a movement of electric energy produced by the solar PV module, A controller for controlling the movement of electric energy stored in the energy storage unit, and a customer group selection unit for selecting a service customer group, the method comprising:
An analysis step of analyzing the load pattern of the customer on the basis of the information of the customer provided with the customer group selection unit;
Wherein the customer group selection unit forms a customer group including a plurality of customers that are service targets based on a result of the analysis step; And
And a service providing step wherein the controller receives the desired service information from each of the plurality of customers and provides a service according to the desired service information to each of the plurality of customers using the electric energy stored in the ESS,
Wherein the analyzing step comprises: The customer group selection unit analyzes the load pattern of the customer based on the information of the provided customer based on the information of the provided customer, sets the type of the customer as a regular power user or an irregular power user according to the analysis result, A high-power-use consumer, a day-and-night constant-power consumer, or a high-power consumer at a specific time zone,
The step of forming the customer population may include forming the customer population to include at least one regular power consumer and an irregular power consumer or at least one high-power consumer at night and a high- Or one or more daytime constant power usage customers and a specific time zone high power usage consumer,
Wherein the desired service information corresponds to one of a peak cut service, a power quality service, and an uninterruptible power supply service,
The information of the provided custody includes at least any one of a type of a customer, a maximum power consumption of the customer, a minimum power consumption of the customer, a power use time of the customer, a location of the customer,
Wherein the system for providing power services to a plurality of consumers using the energy storage device further comprises a power system for supplying external system power,
The service providing step may include:
The controller checks the real-time use power of the plurality of customers based on the target demand power information of the plurality of customers, the electricity generation information of the solar power generation module, the electric energy information stored in the ESS, and the current time information, Providing the electric energy produced by the photovoltaic power generation module or the electric energy stored in the ESS to the specific customer when the real-time use electric power of the photovoltaic generation module is larger than the electric power consumption according to the target demand electric power information of the specific consumer,
When the power generation amount of the photovoltaic power generation module is equal to or greater than the usage power of the load side in a preset weekday, the controller supplies electric energy to the specific customer using the energy produced by the photovoltaic power generation module, And transmitting the electric energy stored in the ESS to the power system so that the controller can sell the electric energy stored in the ESS to the electric power system when the SOC of the ESS becomes equal to or greater than a predetermined rate as the ESS is stored in the ESS,
When the power generation amount of the photovoltaic power generation module is less than the usage power of the load, the controller discharges the electric energy stored in the ESS until the SOC of the ESS becomes a predetermined ratio, And a discharging step of supplying energy to the plurality of consumers by using the energy storage device.
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