基于实用稳定域的次同步振荡阻尼控制器设计  

Subsynchronous Damping Controller Design Based on Practical Stability Region

作　　者：吴熙[1] 蒋平[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《中国电机工程学报》2013年第25期123-129,19,共7页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划项目(2008BAA13B07);江苏省研究生科研创新计划项目(CXZZ11_0151)~~

摘　　要：随着高压直流输电、柔性交流输电装置的广泛应用,电力系统运行方式灵活多变,对次同步振荡有着显著的影响,传统的采用"逐点法"设计的阻尼控制器可能存在鲁棒性不足的问题。为提高控制器的鲁棒性,提出一种基于实用次同步振荡稳定域的阻尼控制器优化设计方法。采用临界阻尼定义一种新的稳定边界,构成实用次同步振荡稳定域,并直接以该稳定域为目标进行阻尼控制器参数优化。分析一个含可控串联补偿(thyristor controlled series capacitor,TCSC)系统的多个运行参数对次同步振荡的影响,发现TCSC导通角是影响次同步振荡模式阻尼的主导因素。采用遗传算法,以TCSC导通角构成的实用次同步振荡稳定域为目标,设计附加励磁阻尼控制器(supplementary excitation damping controller,SEDC)的参数。结果表明,所设计的SEDC能大大扩展TCSC的安全工作范围。Along with the wide applications of nonlinear power device such as high voltage direct current transmission and flexible AC transmission system, power grid operation mode is flexible and changeable. Traditional subsynchronous oscillation （SSO） damping controllers designed by point-to- point method face the problem of poor robustness. In order to improve the robustness of SSO damping controllers, a design method for damping controllers based on practical subsynchronous stability region was suggested. A new type of stability boundary was defined by critical damping level. The new-type boundary was used to construct the practical subsynchronous stability region, which was employed directly in optimizing the parameters of damping controllers. The impact of operational parameters on SSO in a power system including a thyristor-controlled series capacitor （TCSC） was studied, and the conducting angle of TCSC was found to be the leading factor impacting the damping of SSO mode. Aiming at the best subsynchronous stability region of conducting angle of TCSC, the parameters of supplementary excitation damping controller （SEDC） is optimized with genetic algorithm. The results show that SEDC designed by this method can greatly increase the safety operating range of TCSC.

关 键 词：次同步振荡 稳定域 可控串联补偿 附加励磁阻尼控制器 参数优化 

分 类 号：TM71[电气工程—电力系统及自动化]