摘要
统一潮流控制器(Unified power flow Controller,UPFC)是目前最先进的柔性交流输电系统技术。分析UPFC工作在潮流控制时的有功/无功功率平衡,提出一种改进实时功率协调控制方法,通过在UPFC并联侧变流器的有功、无功控制环路中增加改进实时前馈电流,减小动态过程中不平衡功率引起的过电压。基于RT-LAB的硬件在环仿真结果表明,相比现有常规协调控制方法,所提方法减小了潮流控制和系统故障时送端电压和直流电容电压的过电压,提高了系统故障后恢复速度。
Unified power flow controller(UPFC) is the most advance flexible ac transmission system(FACTS). Active/reactive power bal-ance for UPFC is analyzed in this paper when it is working in power flow control mode, and an improved real time power coordi-nate control strategy is proposed in paper. In the parallel converter control loops, an improved real-time dynamic feed forward method is added to reduce over voltage caused by imbalance power. The results of hardware-in-loop simulation based RT-LAB platform show that this new coordinate control strategy,comparing with the conventional one, can decrease excessive voltage excursions of the send terminal ac voltage and DC-link voltage and improve the control performance during power flow changing or system occurring fault.
引文
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