基于多工况综合留数及H_2/H_∞的多回直流系统阻尼控制鲁棒设计方法

Robust design of multi-HVDC system damping control based on synthetic residues of multiple operating conditions and H_2/H_∞

直流附加阻尼控制是提高电力系统区域间低频振荡阻尼的有效措施,但阻尼控制器的安装地点和调制信号的选取是影响阻尼控制器性能的重要因素。综合考虑了控制器安装地点和调制信号组合方案对主导模式的可观可控性、对其他模式的耦合作用和对多种运行工况的鲁棒性3个因素,提出了多工况综合留数指标来确定最优方案,所设计控制器的H2/H∞综合性能验证了多工况综合留数指标的有效性。最后,对一个大规模交直流混联系统在多种运行工况、多种故障情况下进行了仿真,仿真结果验证了基于多工况综合留数和H2/H∞的多回直流系统阻尼控制鲁棒设计方法能有效提高系统区间振荡模式的阻尼。

HVDC supplementary damping control is an effective measure to improve the damping of interarea low-frequency oscillation,but the installation location of damping controller and the selection of input signal are key influencing factors on the performance of damping controllers. A synthetic residues index of multiple operating conditions is proposed to determine the optimal combination of installation location and input signal,which comprehensively considers the controllability and observability of dominated mode,the coupling effect on other modes and the robustness under various operating conditions. Its effectiveness is verified by the comprehensive H2/H∞ performance of the designed damping controller. Simulations are carried out for a large-scale AC/DC hybrid power system with multiple faults under multiple operating conditions and results verify that,the robust design of muhi-HVDC system damping control based on the synthetic residues of multiple operating conditions and the H2/H∞ improves effectively the damping in inter- area low-frequency oscillation mode.