基于分层控制和均压电容的链式STATCOM直流电压控制方法
A Novel Balancing Method for DC Voltage of Cascaded Multi-level STATCOM
龙飞 1易于 1屈志坚2
作者信息
- 1. 国网上海市南供电公司,上海201100
- 2. 国网上海市区供电公司,上海200080
- 折叠
摘要
链式STATCOM可以有效解决高电压大功率场合下的电能质量问题,直流侧功率模块电压的均衡和稳定性对链式STATCOM安全稳定运行是至关重要的.为了保证其直流侧电压的稳定性,在分析电压不平衡机理的基础上,提出一种基于分层控制和均压电容的多电平STATCOM直流电压控制方法,并进行相应控制方法的参数设计.该控制方法分为两个层次:第一层控制相电压幅值和相位;第二层通过均压电容实现功率单元之间的电压均衡.仿真结果验证了该控制方法的有效性和可行性.
Abstract
The stability of DC voltage is crucial to cascaded multilevel converter-based STATCOM.This paper introduces a hierarchical control scheme for DC voltage of cascaded STATCOM.The first layer of the control scheme maintains the phase voltage and the second layer balance the capacitor voltage within each phase.Specially,for the second layer we propose a novel method incorporating an extra balancing capacitor to redistribute energy among inverter modules.We develop two control strategies for the balancing process.Two-module five-level STATCOM was simulated as an example and results indicate that the proposed control scheme effectively stabilized the DC voltage.Additionally,the two balancing strategies are compared.
关键词
多电平/STATCOM/无功功率补偿/直流均压/分层控制Key words
cascaded multilevel/STATCOM/reactive power compensation/DC voltage balancing/hierarchical control引用本文复制引用
出版年
2014
NETL
NSTL
万方数据