高压电器2018，Vol.54Issue(3)：122-127,6.DOI:10.13296/j.1001-1609.hva.2018.03.018
H桥级联STATCOM直流侧电容电压平衡控制的研究
Research on DC Capacitor Voltage Balance Control for Cascaded H-bridge STATCOM
摘要
Abstract
Aiming at the problem that the voltage fluctuation of single capacitor on DC side of the cascaded H-bridge static synchronous compensator(STATCOM) causes unbalance of the phase and the total voltage,a coordinated control strategy of three controllers was proposed.In this strategy,the DC-side single-capacitor voltage controller is of voltage loop,and the single-capacitor voltage is compared with the reference voltage for PI adjustment to achieve voltage balance control of the H-bridge unit capacitor.The controller for DC-side voltage and reactive current is of voltage and current double-loop control,and the square sum of the total capacitance voltage is compared with the reference voltage for PI adjustment to achieve balance control of the total capacitance voltage.Moreover,a simple method for obtaining the reactive reference current was proposed to effectively improve the reliability of the system.Simulation and experiment on the cascaded H-bridge seven-level STATCOM showed that the proposed control strategy could keep the DC-side capacitor voltage within the allowable range with good dynamic performance and robustness when the system is in steady state and the load changes suddenly,and could make the phases of the grid-side voltage and current approximately same.Ultimately,balance control of the DC-side capacitor voltage was achieved,which verifies the effectiveness of the proposed control strategy.关键词
静止同步补偿器/直流侧/电压平衡/无功参考电流Key words
static synchronous compensator/DC link/voltage balancing/reactive current reference引用本文复制引用
汪玉凤,段本涛,赵维东..H桥级联STATCOM直流侧电容电压平衡控制的研究[J].高压电器,2018,54(3):122-127,6.基金项目
国家自然科学基金资助项目(51307076).Project Supported by National Natural Science Foundation of China(51307076). （51307076）
