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Double SVC coordination control device

A technology of coordinated control and thyristor control, applied in harmonic reduction devices, reactive power adjustment/elimination/compensation, flexible AC transmission systems, etc. accident capacity, improved stability, effect of improved stability and reliability

Active Publication Date: 2014-06-04
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to coordinate the adjustment of TCR capacity, switching on and off of the filter branch, parallel capacitor branch and parallel reactance branch, two sets of independent control systems must rely on communication connections to achieve control cooperation. This control method is neither flexible nor effective. Unreliable

Method used

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Embodiment Construction

[0055] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0056] The structural block diagram of the dual sets of SVC coordinated control devices provided by the present invention is as follows: figure 1 As shown, each set of SVC main circuit mainly includes thyristor controlled reactor (TCR), passive filter, shunt capacitor and shunt reactor. Among them, TCR and shunt reactor are used to output inductive reactive power, and passive filter and shunt capacitor are used to output capacitive reactive power. The reactive power output by the SVC can be continuously adjusted by changing the firing angle of the TCR. The passive filter is also used to suppress the harmonics generated by the TCR and the background harmonics in the system, and can also avoid the occurrence of parallel resonance to amplify certain harmonic currents in the system.

[0057] Such as figure 1 As shown, the...

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Abstract

The invention relates to a control device of an electric system static var compensator (SVC), in particular to a double SVC coordination control device. The control device comprises a measuring unit, a voltage adjustor, a distributing unit, a synchronizing system, a protecting unit, an on-off input unit, an on-off output unit and a valve base electronic unit; the measuring unit is respectively connected with the voltage adjustor and the protecting unit, the voltage adjustor is connected with the distributing unit, the protecting unit is respectively connected with the distributing unit and the on-off output unit, the distributing unit is respectively connected with the on-off input unit, the on-off output unit and the valve base electronic unit, and the valve base electronic unit is connected with the synchronizing system and a thyristor control reactor (TCR). Double SVC coordination control is achieved by the adoption of one control system, TCR coordination control and gain optimization under two main transformers in the same transformer substation are achieved, and circulating switching and capacitive reactance interlocking logic of multi-group parallel-connection capacitive circuit branches or sensitive circuit branches under all sections of buses are achieved.

Description

technical field [0001] The invention relates to a control device of a static var compensation device SVC in an electric power system, in particular to a double-set SVC coordination control device. Background technique [0002] Static var compensator (SVC) is more and more widely used in power system, and its main purpose is to stabilize the grid voltage and provide necessary reactive power compensation. If the short-circuit current level in the area where the SVC is connected is low, there will be more obvious interactions between independently controlled SVC devices, resulting in grid instability. [0003] The low-voltage side of the two main transformers in the substation is generally operated separately, and a set of SVC devices is installed on each section of the bus. The control range of each SVC includes the thyristor-controlled reactor (TCR) of the main transformer, the filter branch, Parallel tolerating branch and resisting branch. The control target of the two set...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/10Y02E40/40
Inventor 李兰芳徐丽娟崔大伟王俊永贾跟卯魏春霞
Owner STATE GRID CORP OF CHINA
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