级联式SSSC上层非线性控制方法  

Top Level Nonlinear Control Approach of Cascade SSSC

作　　者：赵洋[1] 肖湘宁[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京102206

出　　处：《高电压技术》2008年第3期583-586,608,共5页High Voltage Engineering

基　　金：国家自然科学基金(50577024)~~

摘　　要：为了优化系统潮流,提高系统稳定性,提出了当静止同步串联补偿器(SSSC)中层采用恒阻抗控制时的SSSC上层非线性控制方法,给出了基于电压源型逆变器(VSC)的无功补偿装置分层控制结构。通过分层控制结构及直接求解方法的应用,简化了基于微分几何理论的反馈精确线性化方法应用于SSSC非线性控制策略的求解过程;结合线性最优控制理论,将基于微分几何理论的精确线性化方法应用于SSSC控制,并应用实时数学仿真器(RTDS)建立了包括SSSC主电路结构、底层调制算法等在内的单机无穷大系统的详细的电磁暂态模型。仿真验证了提出的分层控制结构的可行性及非线性控制方法的有效性。Static Synchronous Series Compensator （SSSC） is a sort of series FACTS equipments based on the Voltage Source Converter （VSC）. Through the layered control strategy of SSSC, which is proposed in this paper, this paper firstly proposes the SSSC＇s up-level nonlinear control strategy based on differential Geometry theory when the SSSC adopts constant impendence middle-level control to improve the power oscillation damping. It＇s proved that the SSSC can be seemed as a controllable impendence in solving the up-level eontrol strategy with constant impendence middle-level control. Usually, the derivation of the nonlinear control approach of SSSC is complex. In this paper, the solving process of SSSC＇s up-level nonlinear control strategy is simplified through the use of three-level control strategy of SSSC and the direct solving approach of differential equations. The input affine equation of the power system including SSSC can be obtained without the coordinate transformation which is proposed by other document and the exact linearization method can be used directly to obtain the nonlinear control approach of SSSC up-level control. The derivation of output function in this paper is simple and applied without applying the compound mapping method. Then the optimal control theory is used to obtain nonlinear optimal control approach of SSSC. Finally, the paper establish detailed the electromagnetic simulation model of a single generation infinite bus power system including SSSC＇s , such as generation model, transmission line model, load model and SSSC＇s main circuit and switch modulation method, in RTDS. The simulation results validate that the proposed the up-level nonlinear optimal control strategy is feasible and efficient in improving the power oscillation damping.

关 键 词：静止同步串联补偿器 分层控制结构 上层控制 非线性控制 直接求解方法 实时数学仿真器 

分 类 号：TM761[电气工程—电力系统及自动化]