电网技术Issue(9)：2632-2638,7.
级联H桥SVG直流侧电容电压平衡控制方法
A Balancing Control Method of DC Capacitor Voltage for Cascaded H-Bridge SVG
摘要
Abstract
The stable control of capacitor voltages of all modules at DC side is an important condition to ensure normal operation of cascaded H-Bridge static var generator (SVG). The mathematical model of active power exchanged between cascaded H-bridge SVG and power grid is derived and the relation of the active power absorbed among phases and the active power absorbed by modules in a phase is obtained, and the reasons causing imbalance among capacitor voltages at DC side of modules in a phase are summarized. In allusion to capacitor voltage imbalance at DC side of cascaded H-bridge SVG, which is caused by pulse delay, a method to dynamically adjust the active power of each module is put forward, that is, an active voltage in the same direction with the compensating current is superimposed to global modulation signal, and the real-time compensation of reactive power by SVG is ensured by applying global control strategy with active-reactive power decoupling. Simulation results validate the effectiveness of the proposed method.关键词
静止无功发生器/级联H桥/电容电压平衡控制/载波移相Key words
SVG/cascaded H-bridge/capacitor voltage balance control/carrier phase shift分类
信息技术与安全科学引用本文复制引用
田铭兴,阎宏,赵雨欣..级联H桥SVG直流侧电容电压平衡控制方法[J].电网技术,2013,(9):2632-2638,7.基金项目
国家自然科学基金项目(51167009)。Project Supported by National Natural Science Foundation of China (51167009) （51167009）
