CAJ | 학술논문

直流侧电容电压平衡是链式静止同步补偿器安全稳定运行的前提.针对直流电容电压不平衡现象做出分析,提出了一种叠加有功电压矢量的直流电容电压平衡控制策略.通过上下层分层控制和叠加有功电压矢量调整控制信号,使得有功功率能按需分配以弥补各级联模块间损耗的差异.上层控制通过解耦实现总体有功、无功功率控制,下层控制通过叠加有功电压矢量实现电容电压平衡控制.该策略物理意义明确、算法简洁、与其他控制量无耦合.通过基于Matlab的时域仿真和实验证明了该策略的正确性、有效性和可行性.
직류측전용전압평형시련식정지동보보상기안전은정운행적전제.침대직류전용전압불평형현상주출분석,제출료일충첩가유공전압시량적직류전용전압평형공제책략.통과상하층분층공제화첩가유공전압시량조정공제신호,사득유공공솔능안수분배이미보각급련모괴간손모적차이.상층공제통과해우실현총체유공、무공공솔공제,하층공제통과첩가유공전압시량실현전용전압평형공제.해책략물리의의명학、산법간길、여기타공제량무우합.통과기우Matlab적시역방진화실험증명료해책략적정학성、유효성화가행성.
DC capacitor voltage balance is the prerequisite for the safe and stable operation of static synchronous compensator (STATCOM). After analyzing the phenomenon of imbalance of DC capacitor voltage of cascaded static synchronous compensator, a method based on active power vector addition is presented to solve this problem. Through adding active power voltage vector and hierarchical control (the upper and the lower control), control signals can be adjusted and active power can be distributed on demands to supply the loss difference among the cascaded modules. The upper control realizes the whole active and reactive power control by decoupling, the lower control realizes voltage balancing control by adding active power voltage vector. The tactic is clear of physics meaning, simple of algorithm and few coupling among control signals. Simulation results based on Matlab/Simulink and experimental results verify that the presented tactic is correct, effective and workable.