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A three-phase static var compensation system and its control method

A technology of static var compensation and control method, which is applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, harmonic reduction device, etc. It can solve the problem that capacitor compensation cannot be adjusted continuously, and achieve low cost and fast response Fast, easy-to-control effects

Active Publication Date: 2021-08-06
NANJING SHEN NINGDA INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The second object of the present invention is to provide a control method for a three-phase static var compensation system that can overcome the shortcoming that capacitor compensation cannot be continuously adjusted, and combines the advantages of accurate compensation of static var compensators

Method used

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  • A three-phase static var compensation system and its control method
  • A three-phase static var compensation system and its control method
  • A three-phase static var compensation system and its control method

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Embodiment Construction

[0070] See attached picture. This embodiment can be used in a three-phase four-wire system, such as figure 2 The three-phase three-wire system diagram shown. In order to illustrate the working process of the system, a three-phase four-wire system is used as an example.

[0071] This embodiment includes A, B, C three-phase lines and a neutral line N, and a static var compensator is respectively connected to the three-phase lines and the neutral line; the static var compensator on the A line is composed of a filter reactor Lfa, filter capacitor Cfa, RC absorption circuit Rca, transformer Ta, first power switch Sa1, second power switch Sa2, capacitive power switch Sac, reactance power switch SaL, compensation capacitor Ca, and compensation reactance La. The static var compensator on the B line is composed of a filter reactor Lfb, a filter capacitor Cfb, a resistance-capacitance absorption circuit Rcb, a transformer Tb, a first power switch Sb1, a second power switch Sb2, a cap...

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Abstract

The invention discloses a three-phase static var compensation system and a control method thereof. The static var compensator includes a high-pass filter composed of a filter reactor and a filter capacitor, and also includes a transformer, and the positive terminals of the primary sides of the transformer are respectively connected to the The negative terminal of the first power switch and the positive terminal of the second power switch, the positive terminal of the first power switch is connected to the filter reactor; a capacitance compensation set in parallel is provided between the positive terminal of the secondary side of the transformer and the filter reactor circuit and reactance compensation circuit, the negative terminals of the primary side, the negative terminals of the secondary side and the negative terminals of the second power switch of the transformers in all static var compensators are connected to each other; , Reactance power switch is controlled by the control system on and off. The invention overcomes the shortcoming that capacitor compensation cannot be adjusted continuously, combines the advantages of accurate compensation of static var compensator, and improves the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of static var compensators, and in particular relates to a three-phase static var compensation system and a control method thereof. Background technique [0002] Electric energy is an indispensable and important energy source in modern society, and it has been widely used in different fields, which also makes the load capacity of modern power grid very severe. With the development of modern industrial technology, the nonlinear load in the power system has increased a lot, and with the improvement of our living standards and the development of technology, many power electronic loads have appeared. Especially with the emergence of electric vehicles, a large number of charging piles have been connected to the distribution network, and with the development of battery technology, various fast charging technologies and batteries have emerged, resulting in an increasing demand for distribution network capacity, ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/1821Y02E40/30Y02E40/40
Inventor 陈如申黎勇跃季伟栋章俊王建华邓海祥
Owner NANJING SHEN NINGDA INTELLIGENT TECH CO LTD
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