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Grid connection method of chained statcom high voltage static var generator

A static reactive power generator technology, applied in reactive power adjustment/elimination/compensation, AC network circuits, electrical components, etc. Impact reduction effect

Active Publication Date: 2020-01-24
烟台东方科技环保节能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a grid-connected method for chain-type STATCOM high-voltage static var generators to overcome the defect of large instantaneous impact current in grid-connection in the prior art

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  • Grid connection method of chained statcom high voltage static var generator
  • Grid connection method of chained statcom high voltage static var generator
  • Grid connection method of chained statcom high voltage static var generator

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] refer to Figure 5 , Figure 5 is the circuit equivalent diagram of the chained STATCOM high-voltage static var generator in the prior art, where L ω R is the impedance of the grid-connected reactor; R is the impedance of the pre-charging resistor; KM2 is the pre-charging switch, and KM1 is the grid-connecting switch. PT1 is a voltage transformer installed on the grid side of the system, assuming that the transformation ratio of PT1 is 10000V / 100V, and CT1 is a current transformer installed on the grid side of the system, assuming that the transformation ratio of CT1 is 400A / 5A. PT2 is the voltage transformer installed on the device side (chain-type STATCOM high-voltage static var generator side), assuming that the transformation ratio of PT2 is 10000V / 100V, CT2 is installed on the device side (chain-type STATCOM high-voltage static var generator sid...

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Abstract

The invention discloses a grid-connection method for chain-type STATCOM high-voltage static var generators, which is used for limiting the impact current when the chain-type STATCOM high-voltage static var generators are connected to the grid. The method first collects the input voltage U S and output voltage U C Phase sequence, phase, amplitude; input current I S and output current I OUT Phase sequence, phase, amplitude; judge and adjust the phase sequence to be positive sequence, judge and adjust the amplitude to be equal, judge and adjust the phase difference to zero. Ensure complete synchronism (same sequence, same phase, same amplitude) when grid-connected, greatly reduce grid-connected impact current, and achieve non-disturbance grid-connected.

Description

technical field [0001] The invention relates to the field of chain-type STATCOM high-voltage static var generators, more specifically, it is a method for reducing the impact current of the chain-type high-voltage static var generator and power grid connected to the grid. Background technique [0002] When the devices in the field of high-voltage reactive power compensation are connected to the grid, there is a common phenomenon of large instantaneous grid-connected impact current. The extremely large grid-connected impact current has a large impact on the circuit breaker and overcurrent tripping, destroying the grid-connected reactor insulation, damage Some of the shortcomings such as power electronic components cannot even be successfully connected to the grid. In order to overcome these shortcomings and ensure smooth grid connection, the following inventions have been made for the high voltage reactive power compensation method. Contents of the invention [0003] The pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCH02J3/1871Y02E40/10
Inventor 杜刚强施明贤刘富永于广张宏岭袁海涛蒋广杰高海荣李庆忠
Owner 烟台东方科技环保节能有限公司