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提出了一种改进的装有静止同步串联补偿器(SSSC)的单机、多机系统Phillips-Heffron模型,并由此得出了SSSC在单机、多机系统中能够抑制低频振荡的理论依据。通过重新构建控制量的方法,得到了装有SSSC的单机系统仿射非线性方程,进而应用非线性变换与非线性反馈理论求解SSSC的非线性控制策略。结合最优控制理论,得到了单机系统SSSC非线性最优控制策略,并将其应用于提高系统阻尼。基于实时数字仿真(RTDS)的仿真结果,证实所做理论分析的正确性以及所提出的非线性控制策略的有效性。
An improved Phillips-Heffron model of single-machine and multi-machine systems with stationary synchronous series compensator (SSSC) is proposed. Based on this, a theoretical basis for SSSC to suppress low-frequency oscillations in single-machine and multi-machine systems is derived. By reconstructing the control variables, the affine nonlinear equations of SSSC with SSSC are obtained, and then the nonlinear control strategy of SSSC is solved by applying nonlinear transformation and nonlinear feedback theory. Combined with the optimal control theory, the SSSC nonlinear single-machine system optimal control strategy is obtained and applied to improve the system damping. Based on the simulation results of real-time digital simulation (RTDS), the correctness of the theoretical analysis and the validity of the proposed nonlinear control strategy are verified.