基于柔性负荷及UPFC的低频振荡抑制策略

Low frequency oscillation suppression method based on flexible load and UPFC

随着电力系统结构日益复杂,越来越多的区域电网逐渐实现互联。如何提高电力系统稳定性、供电可靠性成为急需解决的问题。低频振荡是随着电网互联而产生的,给电网安全稳定运行带来了巨大的挑战。研究了大规模柔性负荷及统一潮流控制器(UPFC)相结合的协同控制策略,抑制电力系统低频振荡。建立基于频率反馈的大规模柔性负荷控制策略,并针对UPFC串联侧设计基于功率反馈附加控制策略。最后采用遗传算法对柔性负荷与UPFC协同控制策略的各参数进行优化,得到最优协同控制策略。通过算例验证了该控制策略的有效性。

With the increasing complexity of the power system, more and more regional power grids are connected with each other. Hence, how to improve the stability and reliability of the power system is in urgent need to be solved. Low frequency oscillation, generated from the connection of different grids, brings high challenge to the safe and stable operation of the power grids. In this paper, the collaborative control strategy of large-scale flexible load and Unified Power Flow Controller(UPFC) is studied to suppress the low-frequency oscillation of the power system. The control strategy for large-scale flexible load based on frequency feedback is established, and the additional control strategy based on active-power feedback is designed at the UPFC series side. Finally, genetic algorithm is adopted to optimize the parameters of the cooperative control strategy, so as to develop an optimal cooperative control strategy. The proposed method is validated by numerous examples.