利用SSSC阻尼电力系统低频振荡

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.

Damping Low Frequency Oscillation by Static Synchronous Series Compensator

This paper proposes an improved Phillips-Heffron model with the single-machine infinite-bus(SMIB)power system and the multi-machine power system including static synchronous series compensator(SSSC).Based on this improved model,the mechanism of damping low frequency oscillation by the SSSC in SMIB power system and multi-machine power system is analyzed.By renewing the control variables,the affine nonlinear equation of SMIB power system including SSSC is obtained.Combining optimal control theory,the nonlinear transformation and nonlinear feedback theory are used to obtain the nonlinear optimal control law of SSSC.Finally,the electromagnetic transient model of SMIB power system with SSSC is established in RTDS to prove the feasibility of the proposed nonlinear optimal control law in damping out power system low frequency oscillations.