Research on DC-link Capacitor Voltage Control Strategies of the Cascaded STATCOM

ZANG Chun-yan1; PEI Zhen-jiang2; HE Jun-jia1; GOU Rui-feng2; ZHU Jing2; SUN Wei2

doi:10.13296/j.1001-1609.hva.2010.01.026

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Research on DC-link Capacitor Voltage Control Strategies of the Cascaded STATCOM

更新时间：2025-04-26

- Research on DC-link Capacitor Voltage Control Strategies of the Cascaded STATCOM
- High VoltageApparatus Vol. 46, Issue 1, Pages: 17-21(2010)
- 作者机构：
  
  1. 华中科技大学电气与电子工程学院
  2. 西安电力机械制造公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2010.01.026
  CLC： TM761
- Published：2010
- 稿件说明：
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[1]臧春艳,裴振江,何俊佳,苟锐锋,朱静,孙伟.链式STATCOM直流侧电容电压控制策略研究[J].高压电器,2010,46(01):17-21.

ZANG Chun-yan1, PEI Zhen-jiang2, HE Jun-jia1, et al. Research on DC-link Capacitor Voltage Control Strategies of the Cascaded STATCOM[J]. High voltageapparatus, 2010, 46(1): 17-21.
[1]臧春艳,裴振江,何俊佳,苟锐锋,朱静,孙伟.链式STATCOM直流侧电容电压控制策略研究[J].高压电器,2010,46(01):17-21. DOI： 10.13296/j.1001-1609.hva.2010.01.026.

ZANG Chun-yan1, PEI Zhen-jiang2, HE Jun-jia1, et al. Research on DC-link Capacitor Voltage Control Strategies of the Cascaded STATCOM[J]. High voltageapparatus, 2010, 46(1): 17-21. DOI： 10.13296/j.1001-1609.hva.2010.01.026.

摘要

链式结构的STATCOM以其损耗小、效率高、输出电压谐波含量少、易于模块化等优点

被广泛应用于各类STATCOM样机及工程中。然而这种结构的STATCOM存在直流侧电容电压不平衡的问题

严重时可能导致STATCOM装置无法正常工作。针对这一突出问题展开研究

分析了各种可能影响到直流侧电容电压不平衡的因素

认为并联损耗、混合损耗和脉冲延时是主要的影响因素。从能量平衡角度归纳了4种常见控制策略

从控制变量角度归纳了3种常见控制策略

最后介绍了1种便于软件实现的新型直流侧电容电压不平衡控制策略

并给出了相关推荐意见。这些可为STATCOM工程设计者提供参考。

Abstract

The cascaded STATCOM has been widely used in various STATCOM prototypes and projects due to its advantages such as low loss

high efficiency

little harmonic content in output voltage

easy modularization

and so on.However

this kind of STATCOM structure contains inherent unbalance capacitor voltage in the DC-link

which may lead to abnormal running of STATCOM.This paper analyzes various factors which may influence this unbalance capacitor voltage

and considers parallel connection loss

mixed loss and pulse delay as the main influence factors.It sums up four common control strategies as viewed from energy balance

and three common control strategies as viewed from control variable.In addition

this paper introduces a novel DC-link capacitor voltage control strategy with convenient software implementation

and offers some recommendations.Its work can be helpful to the STATCOM designers.

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