摘要
讨论了静止同步串联补偿器(SSSC)的电抗模拟特性,在两相同步旋转dq坐标系下建立了控制系统动态模型。分析了直流母线电压的暂态过程,控制系统采用了双闭环解耦控制。由于没有外部能量供应,SSSC从线路上吸取有功功率,通过串联变换器对直流母线电容进行自充电,SVPWM技术的应用提高了直流母线电压的利用率,改善了输出电压的质量,保证系统正常运行。仿真和实验结果表明,在SSSC中采用这种控制策略可以有效地调节线路阻抗,控制系统潮流,提高系统的稳定性。
The performance of static synchronous series compensator （SSSC） to emulate an inductive or a capacitive reactance in series with a transmission line was described in the paper. The dynamic model of control system for SSSC was set up in a synchronously rotating dq frame by using Park＇s transformation. To implement the control system, the transient process of DC link capacitor voltage was analyzed. A double closed loop decoupled control scheme of SSSC was designed. A self-charging control mode which maintains a desired voltage on the DC storage capacitor without energy storage system was proposed. The utilization of DC link voltage and output voltage of series converter are increased by SVPWM technique, which ensures the operation of SSSC. Experimental results agree well with both analytical and simulated results. It demonstrates that SSSC can regulate effectively the transmission line impedance and control the power flow in transmission line by applying the proposed control scheme. As a result, power system stability is improved.
出处
《电工技术学报》
EI
CSCD
北大核心
2006年第9期37-43,共7页
Transactions of China Electrotechnical Society
