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Control method and control system for chain-type static synchronous compensator

A technology of static synchronous compensation and control method, which is applied in the direction of flexible AC transmission system, reactive power adjustment/elimination/compensation, etc., and can solve problems such as locking tripping, difficulty of chain static synchronous compensator, and supporting function of low-voltage side voltage faults

Active Publication Date: 2016-08-24
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the chained static synchronous compensator is connected to an asymmetric grid, if the asymmetrical grid fails, it is difficult for the existing chained static synchronous compensator control method to accurately distinguish the disconnection fault of the AC voltage sensor from the voltage fault on the low voltage side , so that under these two kinds of faults, the chained static synchronous compensator will lock and trip, making it difficult for the chained static synchronous compensator to support the voltage fault on the low voltage side

Method used

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  • Control method and control system for chain-type static synchronous compensator
  • Control method and control system for chain-type static synchronous compensator
  • Control method and control system for chain-type static synchronous compensator

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Embodiment 1

[0038] An embodiment of the present invention provides a chained static synchronous compensator control method, such as figure 1 As shown, the chain static synchronous compensator control method includes:

[0039] Step S1. Obtain the bridge arm information in the two-phase static coordinate system of the chain-type static synchronous compensator. The bridge arm current information in the two-phase static coordinate system includes the bridge arm current i in the two-phase static coordinate system at the current moment αβ and the reference voltage of the bridge arm in the two-phase stationary coordinate system at the previous moment

[0040] It should be noted that the "last moment" in the embodiment of the present invention refers to the moment that is different from the current moment by one time step of the chained static synchronous compensator. For the time step of the chained static synchronous compensator, this Those skilled in the art can determine it according to th...

Embodiment 2

[0088] An embodiment of the present invention provides a chained static synchronous compensator control system, such as image 3 As shown, the chain static synchronous compensator control system includes: current coordinate transformation circuit 1, asymmetric grid voltage observer 2, positive and negative separation circuit 3, double closed-loop vector control circuit 4, voltage coordinate transformation circuit 5 and modulation control circuit 6.

[0089] Wherein, the output end of the chain-type static synchronous compensator 7 is connected to the input end of the current coordinate conversion circuit 1, and the current coordinate conversion circuit 1 is used to obtain the current moment three-phase bridge arm current i of the chain-type static synchronous compensator 7 uvw , and according to the current moment three-phase bridge arm current i uvw Obtain the bridge arm current i under the two-phase static coordinate system at the current moment of the chain static synchron...

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Abstract

The invention discloses a control method and a control system for a chain-type static synchronous compensator, and relates to the technical field of electric power transformation. The control method and the control system can solve technical problem that the chain-type static synchronous compensator is difficult to play a supporting role for low pressure side voltage faults caused by the fact that an existing control method for the chain-type static synchronous compensator is difficult to accurately distinguish alternating current voltage sensor disconnection faults from the low pressure side voltage faults. The control method for the chain-type static synchronous compensator comprises the following steps: obtaining the bridge arm information under a two-phase static coordinate system of the static synchronous compensator; obtaining three-phase bridge arm reference voltage at current moment through a series of transformation according to the bridge arm information under the two-phase static coordinate system at current moment; collecting the capacitor voltage of a bridge arm subcircuit of the static synchronous compensator, obtaining the switch signal of the bridge arm subcircuit according to the three-phase bridge arm reference voltage at current moment, and controlling the chain-type static synchronous compensator through the switch signal of the bridge arm subcircuit. The control method and the control system are applied to control the chain-type static synchronous compensator.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion, in particular to a control method and a control system for a chain-type static synchronous compensator. Background technique [0002] With the development of electronic technology, the chain static synchronous compensator has been more and more widely used in the field of high voltage and high power transmission. The chain static synchronous compensator is generally connected to the power grid through a transformer, and the high and low voltage side voltage and the high and low voltage side current are collected by the AC voltage sensor for phase-locked control. However, when the chained static synchronous compensator is connected to an asymmetric grid, if the asymmetrical grid fails, it is difficult for the existing chained static synchronous compensator control method to accurately distinguish the disconnection fault of the AC voltage sensor from the voltage fault on the low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/18Y02E40/10
Inventor 龚文明冯满盈朱喆陈俊赵晓斌杨煜许树楷
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD