A Double-Sequence Control Strategy of Static Var Generators Combined with Random Space Vector Pulse Width Modulation

doi:10.7652/xjtuxb201912016

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A Double-Sequence Control Strategy of Static Var Generators Combined with Random Space Vector Pulse Width Modulation

更新时间：2025-07-09

- A Double-Sequence Control Strategy of Static Var Generators Combined with Random Space Vector Pulse Width Modulation
- Vol. 53, Issue 12, Pages: 120-130(2019)
- 作者机构：
  
  西安科技大学电气与控制工程学院,西安,710054
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201912016
  CLC： TM762.1
- Online First：10 December 2019，
  
  Published：2019
- 稿件说明：
移动端阅览
A Double-Sequence Control Strategy of Static Var Generators Combined with Random Space Vector Pulse Width Modulation[J]. 2019, 53(12): 120-130.
DOI：

A Double-Sequence Control Strategy of Static Var Generators Combined with Random Space Vector Pulse Width Modulation[J]. 2019, 53(12): 120-130. DOI： 10.7652/xjtuxb201912016.

摘要

针对采用传统空间矢量脉宽调制(SVPWM)技术的静止无功发生器(SVG)输出电流及电压中含有幅值较高的高次谐波分量问题

提出一种将双随机SVPWM与SVG双序同步相结合的控制策略。首先

在三相三线制系统中将不平衡负载电流与SVG补偿电流分别进行正负序变换

采用基于前馈解耦的电压、电流双闭环控制对正序无功及负序分量进行同步补偿

其中电压外环采用模糊PI控制器以稳定直流侧电压。然后

采用随机开关频率与随机脉冲位置相结合的双随机SVPWM技术

以获得更宽的谐波频谱

优化并网电流波形。不同工况下的仿真及实验表明:所提控制策略可大幅削减SVG输出电流及电压的谐波幅值

驱散集中于开关频率及其整数倍处的谐波能量

获得连续的功率谱密度; 实验中采用此控制策略的并网电流谐波畸变率降低至3.88%

功率因数提高到0.972

验证了此控制策略的有效性。

Abstract

A control strategy combining double random space vector pulse width modulation(SVPWM)with static var generator(SVG)double sequence synchroni-ation is proposed to solve the problem that the output current and voltage of SVG based on traditional SVPWM technology contains higher-order harmonic components with high amplitude. First

positive and negative order transformations between the unbalanced load current and the SVG compensation current are respectively carried out in the three-phase three-line system. The feed forward decoupling based voltage and current double closed-loop control is used to synchronously compensate the positive sequence reactive power and negative order components. A fu--y PI controller is used in the voltage outer loop to stabili-e the DC side voltage. Then

a double random SVPWM technique based on combination of random switching frequency and random pulse position is used to obtain a wider harmonic spectrum and to optimi-e the grid current waveform. Finally

sim

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Keywords

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