KR20190007664A - Stablization system for distribution system - Google Patents

Abstract

According to an embodiment of the present invention, provided is a distribution system stabilizing system, which comprises: a weight factor calculating unit for calculating a weight factor of a distance impedance, a power factor and a load amount of each distribution type power linked to a railway; a communication unit for receiving a voltage variation value of a feeder railway from a terminal device mounted on the feeder railway; a voltage variation relation index calculating unit for calculating a voltage variation relation index using the weight factor and the voltage variation value of the feeder railway; a charge factor calculating unit for calculating a charge factor of an energy storage system (ESS) required to maintain voltage of the feeder railway within a predetermined stable voltage range when the voltage of the feeder railway is changed; a calculation unit for calculating a railway unique stability factor using the voltage variation relation index and the charge factor; and a control unit for controlling charging and discharging of the energy storage system to converge the same on the railway unique stability factor when the voltage variation of the feeder railway is generated.

Description

{STABLIZATION SYSTEM FOR DISTRIBUTION SYSTEM}

One embodiment of the present invention relates to a distribution system stabilization system, and more particularly to a distribution system stabilization system that can be applied to a distribution system incorporating distributed power and energy storage systems.

When distributed power supply voltage increases when LDC (Line Drop Compensator) and distributed power supply are connected in the grid, the grid current decreases. The LDC recognizes the reduction of the grid current and judges that the load of the grid is reduced. By decreasing the tap, the discharge reference voltage is lowered. As a result, a voltage drop connected to the feeder line occurs.

In order to solve the voltage fluctuation in the conventional feeder line, a method of solving the voltage fluctuation through the power factor cooperative method between the LDC (Line Drop Compensator) and the large-capacity distributed power source has been proposed. This method tries to solve the voltage fluctuation by the power factor coordination method between the LDC and the large distributed power source when a plurality of distributed power sources are connected to the line.

However, this method can solve the voltage drop (fluctuation) to other lines in the feeder if the power factor cooperative operation between the LDC and the large-capacity distributed power supply is possible. However, when a large number of distributed power is supplied to the line, If the voltage drop (fluctuation) is to be solved by the power factor coordination method, since the tap adjustment is performed without considering a large number of distributed power sources other than the large dispersion power source in the LDC tap adjustment, Fluctuation) can not be solved

However, this method can not solve the voltage drop (fluctuation) to the other line due to many distributed power sources that are not taken into consideration because the adjustment of the tap is performed without considering a large number of distributed power sources other than the large distributed power sources .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power system stabilization system capable of eliminating voltage fluctuations in a feeder that may occur when a plurality of distributed power sources are connected to a power distribution system.

According to an embodiment of the present invention, a weighting factor calculation unit for calculating a weighting factor of a distance impedance, a power factor and a load of each distributed power source connected to a line; A communication unit for receiving a voltage variation value of the feeder line from a terminal device mounted on a feeder line; A voltage fluctuation relation index calculating unit for calculating a voltage fluctuation relation index using the weighting factor and the voltage variation value of the feeder line; A charge factor calculating unit for calculating a charge factor of an energy storage system (ESS) required to maintain the voltage of the feeder line within a predetermined stable voltage range when the voltage of the feeder line fluctuates; An arithmetic unit for calculating a line inherent stability coefficient using the voltage fluctuation relation index and the charge coefficient; And a control unit for controlling charging and discharging of the energy storage system so as to converge to the line inherent stability coefficient when voltage fluctuation occurs in the feeder line.

Wherein the weighting coefficient calculator comprises: a distance impedance weighting factor calculator for calculating a distance impedance using the voltage variation measurement value and the voltage variation calculation value of each distributed power source; A power factor weighting factor calculating unit for calculating a power factor weighting factor using the power factor measured value of each distributed power source, and a load weight factor calculating unit for calculating a load factor factor using the combined capacity value of each distributed power source have.

The voltage fluctuation relation index calculating section may calculate the weighting factor (f) according to the following expression (1).

[Equation 1]

는 피더 선로의 최대 전압 변동치이고,

는 k번째 분산형 전원별 거리 임피던스 가중계수이고,(1)

Is the maximum voltage fluctuation value of the feeder line,

Is the k-th distributed power source-specific distance impedance weighting factor,

은 k번째 분산형 전원의 전압 변동 계측값이고,

은 k번째 분산형 전원의 전압 변동 계산값이고,

는 K번째 분산형 전원의 정격 출력 전류이고,

는 K번째 분산형 전원의 운전역률각, R은 선로저항이고, X는 선로리액턴스이다.

Is the voltage variation measurement value of the k-th distributed power source,

Is the voltage variation calculation value of the k-th distributed power source,

Is the rated output current of the K-th distributed power supply,

R is the line resistance, and X is the line reactance.

는 계통내 k번째 분산형 전원의 운전 역률값으로 분산형 전원 관리 시스템의 전력 계측 장치 또는 능동형 전압 조절 장치의 전력 계통 데이터로부터 취득할 수 있고,

는 계통내 k번째 분산형 전원의 연계 용량값이다.

Can be obtained from the power system data of the power measurement device of the distributed power management system or the active voltage control device as the value of the operating power factor of the k-th distributed power source in the grid,

Is the combined capacity value of the kth distributed power source in the grid.

The line inherent stability coefficient calculating unit may calculate the line inherent stability coefficient according to Equation (2).

&Quot; (2) "

(Where f is the voltage fluctuation relationship index and E is the charge factor)

The power distribution system stabilization system of the present invention can calculate the influence of a plurality of distributed power sources on the voltage of the feeder line by using the power system data, and stabilize the voltage of the feeder line by using the calculated power.

In addition, it is possible to stabilize the voltage of the feeder line by controlling the charge / discharge of the energy storage system when the distributed power source is added or removed.

1 is a conceptual diagram of a power distribution system according to an embodiment of the present invention.
2 is a block diagram of a configuration of a distribution system stabilization system according to an embodiment of the present invention.
3 is a view for explaining the operation of the system stabilization system according to an embodiment of the present invention.
4 is an operational flowchart of a power distribution system stabilization system according to an embodiment of the present invention.
5 is an operational flowchart of a power distribution system stabilization system according to another embodiment of the present invention.
6 is a conceptual diagram of a dispersion-type power supply-related low-voltage distribution line related to a voltage variation calculation value of a distributed power supply

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these 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 second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a conceptual diagram of a power distribution system according to an embodiment of the present invention.

Referring to FIG. 1, the distributed power source 200 is a system for generating electric power using an energy source. The distributed power supply 200 can supply the produced power to the energy storage system. The distributed power source 200 may be a solar power generation system, a wind power generation system, a tidal power generation system, or the like, and may further include a power generation system that generates power using renewable energy using solar heat or geothermal power. In particular, a solar cell that generates electric energy using solar light is easy to install in each home or factory, and is suitable for application to an energy storage system dispersed in each home. The distributed power supply 200 may include a plurality of power generation modules in parallel to generate power for each power generation module, thereby constituting a large-capacity energy system.

The system 1 includes a power plant, a substation, a transmission line, and the like. The system 1 supplies power to the energy storage system 300 or the feeder 2 and receives power supplied from the energy storage system 300 when the system 1 is in a normal state. The supply of power from the system 1 to the energy storage system 300 or the feeder 2 is stopped and the supply of power from the energy storage system 300 to the system 1 is also stopped when the system 1 is in an abnormal state do.

The feeder 2 may be, for example, a household, a factory, or the like, which consumes power generated from the distributed power source 200, power stored in the battery, or power supplied from the system.

The LDC (Line Drop Compensator) (3) is a voltage regulator that can collectively adjust the voltages of all distribution lines and facilities below the main transformer.

The energy storage system 300 can store the power generated by the distributed power supply 200 in the battery and send the generated power to the system 1. [ The energy storage system 300 may also transfer power stored in the battery to the system 1 or store the power supplied from the system 1 in the battery. The energy storage system 300 may also provide power to the feeder 2 by performing an uninterruptible power supply (UPS) operation in the event of an outage such as a system 1 failure, The power generated by the distributed power source 200 or the power stored in the battery can be supplied to the feeder 2 even in a normal state.

The power distribution system stabilization system 100 may be implemented in a distributed power management system (not shown) or the energy storage system 300, or may be implemented as a separate system. The power distribution system stabilization system 300 acquires power system data from a power measurement device VCB or an active voltage control device ACB of a distributed power management system and a feeder remote terminal unit (FRTU) provided on a feeder line , And the charge / discharge of the energy storage system can be controlled using this.

FIG. 2 is a block diagram illustrating a system for stabilizing a power distribution system according to an embodiment of the present invention. FIG. 3 is a diagram for explaining operations of a system stabilization system according to an embodiment of the present invention. 2 and 3, a power distribution system stabilization system 100 according to an embodiment of the present invention includes a weighting factor calculation unit 10, a communication unit 30, a voltage fluctuation relation index calculation unit 20, A calculation unit 40, an operation unit 60, a control unit 50, and a database 70. [

The weighting factor calculation unit 10 can calculate the weighting factor of the distance impedance, the power factor and the load of each distributed power source connected to the line. The system voltage is affected by the distance impedance, the power factor, and the system load. The weight factor calculator can calculate the weight factor by numerically converting the degree of influence on the system voltage change in consideration of these three factors.

The weighting factor calculation unit 10 may include a distance impedance weighting factor calculation unit 11, a power factor calculation unit 12, and a load weighting factor calculation unit 13.

The distance impedance weighting coefficient calculator 11 can calculate the distance impedance weighting factor using the voltage variation measurement value and the voltage variation calculation value of each distributed power source. The voltage variation of the feeder line increases in proportion to the distance. The distance impedance weighting coefficient calculating unit 11 can calculate the distance variation weighting coefficient by calculating the voltage variation measurement value and the voltage variation calculation value of the distributed power source.

를 산출할 수 있다.The distance impedance weighting coefficient calculator 11 calculates the distance impedance weighting coefficient

Can be calculated.

&Quot; (3) "

는 k번째 분산형 전원별 거리 임피던스 가중계수이다.

은 k번째 분산형 전원의 전압 변동 계측값으로 피더내 단말장치와 분산형 전원 관리 시스템의 전력 계측 장치 또는 능동형 전압 조절 장치의 전력 계통 데이터로부터 취득하여 하기의 수학식 4로 산출 될 수 있다. In Equation 3,

Is the k-th distributed-power-dependent distance-impedance weighting factor.

Can be calculated from the power system data of the power measuring device of the terminal device in the feeder and the distributed power management system or the power system data of the active voltage regulator by the voltage variation measurement value of the k-th distributed power source,

&Quot; (4) "

는 k번째 분산형 전원의 전압 변동 계산값으로 하기 수학식 5에 따라 산출될 수 있다.

Can be calculated according to the following equation (5) as the voltage variation calculation value of the k-th distributed power source.

&Quot; (5) "

는 분산형 전원의 정격 출력 전류이고,

는 분산형 전원의 운전역률각, R은 선로저항이고, X는 선로리액턴스로, 피더내 단말장치와 분산형 전원 관리 시스템의 전력 계측 장치 또는 능동형 전압 조절 장치의 전력 계통 데이터로부터 될 수 있다.In Equation (5)

Is the rated output current of the distributed power supply,

R is the line resistance, and X is the line reactance, which can be derived from the power system data of the power measuring device of the terminal device in the feeder and the distributed power management system or the active voltage regulating device.

는 계통 전원과 분산형 전원간의 전압 변동값을 의미하고, Z는 분산형 전원과 계통 전원 사이 선로의 임피던스를 의미한다.6 is a conceptual diagram of a dispersion-type power source-connected low-voltage distribution line associated with a voltage variation calculation value of a distributed-type power source. 6,

Denotes the voltage variation value between the grid power and the distributed power, and Z denotes the impedance of the line between the distributed power and the grid power.

를 산출할 수 있다.The power factor weighting factor calculator 12 can calculate the power factor factor using the power factor measured value of each distributed power source. The power factor weighting factor calculator 12 calculates, for example, a power factor weighting factor

Can be calculated.

&Quot; (6) "

는 계통내 k번째 분산형 전원의 운전 역률값으로 분산형 전원 관리 시스템의 전력 계측 장치 또는 능동형 전압 조절 장치의 전력 계통 데이터로부터 취득할 수 있다.In Equation (6)

Can be obtained from the power system data of the power measurement device of the distributed power management system or the active voltage regulator by the value of the operation power factor of the k-th distributed power source in the grid.

The load weighting factor calculating unit 13 can calculate the load weighting factor using the combined capacity value of each distributed power source. The load weighting factor calculation unit 13 can calculate the load factor weighting coefficient according to the following equation (7), for example.

&Quot; (7) "

는 계통내 k번째 분산형 전원의 연계 용량값으로 분산형 전원 관리 시스템의 전력 계측 장치 또는 능동형 전압 조절 장치의 전력 계통 데이터로부터 취득할 수 있다.In Equation (7)

Can be obtained from the power system data of the power measuring apparatus of the distributed power management system or the active voltage regulating apparatus by the combined capacity value of the k-th distributed power source in the system.

를 산출할 수 있다,The weighting factor calculation unit 10 calculates a weighting factor

Can be calculated,

&Quot; (8) "

The communication unit 30 can receive the voltage change value of the feeder line from the terminal unit (FRTU) mounted on the feeder line.

The voltage fluctuation relation index calculating section 20 can calculate the voltage fluctuation relation index using the weighting factor and the voltage fluctuation value of the feeder line. The voltage fluctuation relation index calculating section 20 can numerically calculate the influence of the weighting factor on the voltage fluctuation of the feeder line by using the weighting factor calculated by the weighting factor calculating section 10 and the maximum voltage fluctuation value of the feeder line have. The voltage fluctuation relationship index calculating section 20 can calculate the voltage fluctuation relationship index f according to the following equation (9), for example.

&Quot; (9) "

는 피더 선로의 최대 전압 변동치로 통신부에서 수신한 피더 선로의 전압 변동치로부터 추출한 값이다.In Equation (9)

Is a value extracted from the voltage change value of the feeder line received by the communication unit at the maximum voltage change value of the feeder line.

The charge factor calculator 40 may calculate a charge factor of an energy storage system (ESS) required to maintain the voltage of the feeder line within a predetermined stable voltage range when the voltage of the feeder line fluctuates. The stable voltage range of the feeder line is stored in the database 70 at a preset value. When the voltage of the feeder line varies due to the voltage of the distributed power source, the energy storage system performs charging or discharging to maintain the voltage of the feeder line at a predetermined stable voltage range. The charge-amount calculating unit 40 calculates the charge capacity of the energy storage system when the feeder line voltage is maintained within a predetermined stable voltage range by the charging or discharging operation of the energy storage system at the time of voltage fluctuation of the feeder line Can be calculated. That is, the charging factor may mean the average charging or discharging capacity of the energy storage system that allows the energy storage system, which is dispersed in the system, to charge or discharge and maintain the feeder line voltage within the stable voltage range.

&Quot; (10) "

의 의미는 계통 내에서 n개의 에너지 저장 시스템이 있음을 의미하고,

는 계통내 k번째 분산형 전원에 대한 에너지 저장 시스템의 충전 또는 방전값을 의미한다.

는 계통 내 k번째 에너지 저장 시스템부터 데이터를 취득할 수 있다.N < / RTI >

Means that there are n energy storage systems in the system,

Means the charge or discharge value of the energy storage system for the k-th distributed power source in the grid.

Can acquire data from the kth energy storage system in the system.

를 산출할 수 있다.The calculation unit 60 can calculate the line inherent stability coefficient using the voltage fluctuation relation index and the charge coefficient. The calculation unit calculates, for example, the line inherent stability coefficient

Can be calculated.

&Quot; (11) "

In Equation (11), E denotes a charging coefficient of the energy storage system. The line inherent stability factor is inherent in the grid and can be set to a unique value regardless of the addition, dropout, and change in feeder line voltage of the distributed power source.

The control unit 50 can control the charging and discharging of the energy storage system so as to converge to the line inherent stability coefficient when the voltage fluctuation of the feeder line occurs.

When distributed power supply is added and the feeder line system current decreases, the voltage of the feeder line drops because LDC lowers the output reference voltage. At this time, the weighting factor calculation unit 10 calculates a new weighting factor in accordance with the addition of the distributed power source, and the voltage variation relation index calculation unit 20 calculates a voltage variation relation index by applying a new weighting factor. The newly calculated voltage fluctuation relationship index has an increased value than the value before the addition of the distributed power source and the control unit 50 increases the value E by charging the energy charging system to converge to the line inherent stability coefficient value calculated according to Equation (11) And the feeder line voltage can be maintained within a predetermined stable voltage range by satisfying the S value.

Alternatively, when the distributed power source is dropped and the feeder line current increases, the voltage of the feeder line rises by raising the delivery reference voltage of the LDC. At this time, the weighting factor calculation unit 10 calculates a new weighting factor in accordance with the addition of the distributed power source, and the voltage variation relation index calculation unit 20 calculates a voltage variation relation index by applying a new weighting factor. The newly calculated voltage fluctuation relationship index has a value smaller than the value before addition of the distributed power source and the control unit 50 decreases the value E by discharging the energy charging system to converge to the line inherent stability coefficient value calculated according to Equation (11) And the feeder line voltage can be maintained within a predetermined stable voltage range by satisfying the S value.

4 is an operational flowchart of a power distribution system stabilization system according to an embodiment of the present invention. Referring to FIG. 4, the weighting coefficient calculator calculates the weighting factors of the distance impedance, power factor, and load of each distributed power source connected to the line. The weighting factor calculator calculates the weighting factor of the system using the distance impedance, the power factor, and the weighting factor of the load (S401).

Next, the communication unit receives the voltage change value of the feeder line from the terminal device mounted on the feeder line (S402).

The voltage fluctuation relation index calculating unit calculates the voltage fluctuation relation index using the weighting factor and the voltage fluctuation value of the feeder line (S403).

The charge factor calculator calculates the charge factor of the energy storage system required to maintain the voltage of the feeder line within the predetermined stable voltage range when the voltage of the feeder line fluctuates (S404).

The calculation unit calculates the line inherent stability coefficient using the voltage fluctuation relation index and the charge coefficient. The line inherent stability coefficient is set to a unique value in the system and stored in the database (S405).

Next, the control unit senses the feeder line system current which decreases due to the addition of the distributed power source (S406).

The weighting factor calculator recalculates the weighting factor of the distance impedance, power factor and load for each distributed power source associated with the line. The weighting factor calculator calculates the weighting factor of the system using the re-calculated distance impedance, the power factor, and the weighting factor of the load (S407).

The voltage fluctuation relationship index calculating unit calculates a voltage fluctuation relational index by applying a new weighting factor (S408).

The newly calculated voltage fluctuation relationship index has a value higher than the value before the addition of the distributed power source, and the control unit increases the value E by charging the energy charging system to converge to the line inherent stability coefficient value, The voltage is maintained within the predetermined stable voltage range (S409).

5 is an operational flowchart of a power distribution system stabilization system according to another embodiment of the present invention. Referring to FIG. 5, the weighting factor calculator calculates the weighting factor of the distance impedance, the power factor, and the load of each distributed power source connected to the line. The weighting factor calculator calculates the weighting factor of the system using the distance impedance, the power factor, and the weighting factor of the load (S501).

Next, the communication unit receives the voltage change value of the feeder line from the terminal device mounted on the feeder line (S502).

The voltage fluctuation relation index calculating unit calculates the voltage fluctuation relation index using the weighting factor and the voltage fluctuation value of the feeder line (S503).

The charge factor calculator calculates a charge factor of the energy storage system required to maintain the voltage of the feeder line within a predetermined stable voltage range when the voltage of the feeder line fluctuates (S504).

The calculation unit calculates the line inherent stability coefficient using the voltage fluctuation relation index and the charge coefficient. The line inherent stability factor is set to a unique value in the system and stored in the database (S505).

Next, the control unit senses the feeder line system current that is increased due to dropout of the distributed power source (S506).

The weighting factor calculator recalculates the weighting factor of the distance impedance, power factor and load for each distributed power source associated with the line. The weighting factor calculator calculates the weighting factor of the system using the re-calculated distance impedance, the power factor, and the weighting factor of the load (S507).

The voltage fluctuation relationship index calculating unit calculates a voltage fluctuation relational index by applying a new weighting factor (S508).

The newly calculated voltage fluctuation relationship index has a value smaller than the value before the addition of the distributed power source, and the control unit reduces the E value by discharging the energy charging system so as to converge to the line inherent stability coefficient value, The voltage is maintained within the predetermined stable voltage range (S509).

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

10: Weighting factor calculation unit
20: Voltage variation relation index calculating section
30:
40: Charge factor calculating unit
50:
60:
70: Database

Claims (4)

A weighting factor calculator for calculating a weighting factor of a distance impedance, a power factor and a load of each distributed power source connected to the line;
A communication unit for receiving a voltage variation value of the feeder line from a terminal device mounted on a feeder line;
A voltage fluctuation relation index calculating unit for calculating a voltage fluctuation relation index using the weighting factor and the voltage variation value of the feeder line;
A charge factor calculating unit for calculating a charge factor of an energy storage system (ESS) required to maintain the voltage of the feeder line within a predetermined stable voltage range when the voltage of the feeder line fluctuates;
An arithmetic unit for calculating a line inherent stability coefficient using the voltage fluctuation relation index and the charge coefficient; And
And a control unit for controlling charging and discharging of the energy storage system so as to converge to the line inherent stability coefficient when voltage fluctuation occurs in the feeder line. The method according to claim 1,
The weighting coefficient calculator calculates,
A distance impedance weighting factor calculator for calculating a distance impedance using the voltage variation measurement value and the voltage variation calculation value of each distributed power source;
A power factor weighting factor calculating unit for calculating a power factor weighting factor using the power factor measured value of each distributed power source;
And a load weight coefficient calculating unit for calculating a load weight factor using the combined capacitance value of each distributed power source. 3. The method of claim 2,
Wherein the voltage fluctuation relation index calculating section calculates the weighting factor (f) according to the following equation (1).
[Equation 1]

(1)

Is the maximum voltage fluctuation value of the feeder line,

Is the k-th distributed power source-specific distance impedance weighting factor,

Is the voltage variation measurement value of the k-th distributed power source,

Is the voltage variation calculation value of the k-th distributed power source,

Is the rated output current of the K-th distributed power supply,

Is the operating power factor angle of the K-th distributed power supply, R is the line resistance, X is the line reactance,

Can be obtained from the power system data of the power measurement device of the distributed power management system or the active voltage control device as the value of the operating power factor of the k-th distributed power source in the grid,

Is the combined capacity value of the k-th distributed power source in the grid) The method of claim 3,
Wherein the line inherent stability coefficient calculating unit calculates the line inherent stability coefficient according to Equation (2): " (2) "
&Quot; (2) "

(Where f is the voltage fluctuation relationship index, E is the charge coefficient,

Is the charge or discharge value of the energy storage system for the kth distributed power supply in the grid)

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