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Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation

A technology of command current and extraction method, applied in reactive power adjustment/elimination/compensation, flexible AC transmission systems, AC networks to reduce harmonics/ripples, etc., can solve problems such as low accuracy and complex algorithms

Active Publication Date: 2013-07-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some compensation methods using the instantaneous negative sequence current component and the instantaneous current sampling method have appeared, but at the same time, new problems have been brought about, such as complex algorithms and low precision

Method used

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  • Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation
  • Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation
  • Angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation

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Embodiment Construction

[0034] figure 1 It is a schematic diagram of an angle chain SVG. The chain SVG includes three-phase links, and each link includes several H-bridge units connected in series. The three-phase links are connected in series with reactors, and the three-phase links are connected in series with reactors. The branches are angularly connected and connected between the three-phase grid and the three-phase load, and the H-bridge unit is a single-phase full-bridge inverter. u in the picture a , u b , u c is the grid voltage, i sa i sb i sc is the grid side current, i la i lb i lc is the load current, i a i b i c is the line current of the compensator, i ab i bc i ca is the phase current of the compensator.

[0035] Assuming that the grid voltage is symmetrical and has no fluctuation, u a , u b , u c They are:

[0036] u a u ...

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Abstract

The invention discloses an angle form chain-type static var generator (SVG) directive current extraction method considering negative sequence compensation. The angle form chain-type SVG directive current extraction method considering the negative sequence compensation comprises a chain-type SVG. The chain-type SVG comprises a three-phase chain link. Each chain link comprises a plurality of H bridge cells which are connected in series. The three-phase link is respectively connected with an electric reactor in serious to form a chain link subcircuit, and after being connected, three chain link subcircuits are accessed between a three-phase power grid and a three-phase load. The angle form chain-type SVG directive current extraction method considering the negative sequence compensation can be applied to a negative sequence, reactive and harmonic current comprehensive compensation system based on the angle form chain-type SVG, and is clear in physical significance and simple in algorithm.

Description

technical field [0001] The invention relates to a chain-type static var generator (Static Var Generator, SVG), in particular to an angle-type chain-type SVG command current extraction method considering negative sequence compensation. Background technique [0002] There are a large number of unbalanced industrial loads and some single-phase large-capacity loads in the power system, such as industrial AC electric arc furnaces, electrified railways, etc. The reactive power and negative-sequence current generated by these unbalanced loads cause the loss of system electric energy, which is becoming more and more serious, threatening the safe and economical operation of the power system. Negative sequence compensation schemes suitable for medium and high voltage distribution networks are divided into two categories: energy-integrating converter schemes, which use converters with a common DC side for comprehensive compensation of reactive power and negative sequence, and railway p...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/10Y02E40/40
Inventor 罗安熊桥坡黎小聪刘雷马伏军何志兴
Owner HUNAN UNIV
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