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Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage

A technology of static synchronous compensation and compensation method, which is applied in the direction of reactive power adjustment/elimination/compensation, electrical components, circuit devices, etc., can solve the problems of inability to provide active power compensation, capacitors cannot be compensated by distribution lines, etc., to improve electric energy quality, reducing the number of failures, improving stability and robustness

Pending Publication Date: 2021-08-13
STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +1
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Problems solved by technology

Therefore, capacitors cannot be used for distribution line compensation under varying load conditions
Also, capacitors or other traditional compensating devices cannot provide any active power compensation in distribution lines
For these reasons, traditional compensation devices are not suitable for providing reactive and active power compensation under dynamic load changes

Method used

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  • Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage
  • Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage
  • Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage

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Experimental program
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Embodiment

[0107] A method for compensating active power and reactive power of a power distribution network based on an energy storage static synchronous compensator, comprising the following steps:

[0108] Step 1: Build a static synchronous compensator D-STATCOM with energy storage, such as figure 1 As shown, the nonlinear dynamic model of STATCOM / BESS is obtained, describing the dynamic process of STATCOM / BESS and the relationship between the voltage and current of the interface with the system, specifically:

[0109] The three-phase dynamic differential equation of the AC side of STATCOM / BESS and the system interface is:

[0110]

[0111] Among them, L and R are the inductance and resistance of the transformer respectively, u a , u b , u c is the three-phase-to-ground voltage of the STATCOM / BESS access point, e a 、e b 、e c is the three-phase-to-ground voltage output by the inverter, i ea i eb i ec is the three-phase current output by the inverter;

[0112] Taking the acc...

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Abstract

The invention discloses a power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage. A static synchronous compensator D-STATCOM containing energy storage based on an instantaneous symmetric component theory carries out reactive and real power compensation on a power distribution network. The method comprises the following steps of firstly, establishing an energy-storage-containing static synchronous compensator model, and describing the limitation of a traditional compensation device and the effectiveness of the energy-storage-containing static synchronous compensator device for improving the power quality of a distribution network, secondly, extracting fundamental wave positive-sequence components of three-phase voltage and current by using an instantaneous symmetric component theory, and finally, controlling the static synchronous compensator containing energy storage according to the provided control strategy, and providing reactive compensation and active power compensation. The reactive power and active power compensation of the power distribution network is realized, the electric energy quality of the power distribution network is improved, the fault frequency of the power distribution system is reduced, and the stability and robustness of the power distribution system are improved.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a power distribution static synchronous compensator based on energy storage and a power distribution network active and reactive power compensation method. Background technique [0002] A large number of inductive loads connected in the distribution network bring a lot of reactive power loss to the entire distribution network. Reactive power loss has brought many adverse effects to the distribution network. Therefore, the distribution network needs to provide reactive power compensation to alleviate or reduce these adverse effects. The resistance in the distribution network is relatively large. In order to reduce the voltage drop caused by the resistance of the distribution line, active power compensation should also be provided. Therefore, the distribution network should carry out active power compensation and reactive power compensation at the same time. There are many defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/28
CPCH02J3/1842H02J3/28H02J2203/20Y02E40/10
Inventor 张自伟伏祥运程振华岳付昌陆兵王建新朱立位黄淮
Owner STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO
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