PSS和TCSC抑制低频振荡交互及协调研究
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摘要
电力系统稳定器和可控串联补偿器的附加阻尼控制器能分别有效阻尼机间振荡和区域振荡,但是当同时用于电力系统控制时很可能产生负交互作用。本文建立了含PSS和TCSC的系统模型,用RTDS仿真证明这种负的交互作用确实存在。并通过整定控制器的参数,分析两者对多机电力系统低频振荡的抑制效果的影响,证明合理的配置控制器参数能更有效地抑制低频振荡。首次采用改进的粒子群算法对PSS和TCSC阻尼控制器进行协调优化。优化中使用的目标函数考虑了系统多种典型运行方式下的机电振荡模态性能,因而设计出的阻尼控制器具有较强的鲁棒性.在IEEE-4机11节点的系统上进行了测试。时域仿真与特征值分析表明,该方法能有效地将系统特征根移到复平面目标函数限定的区域内,很好的抑制低频振荡。
Power system oscillations of both local mode and inter area mode can be successfully suppressed if auxiliary damping controllers such as power system stabilizer(PSS) and thyristor controlled series compensators(TCSC) are well tuned. When PSS and TCSC are both installed in power system, it is possible they may interact negatively. System mathematic models that contain PSS and TCSC are established and the damping characteristic is studied in detail .The negative interaction was validated through simulation in RTDS. Simulating also indicate that the damping can be improved through coordinating the parameters of the controllers. This thesis employes the Modified Particle Swarm Optimization(MPSO) that was an improved Particle Swarm Optimization(PSO) to coordinate the design of PSS and TCSC controllers. By considering multiple representative operating conditions in constructing the objective function, robustness of the damping controllers is guaranteed. An example is demonstrated using the IEEE4-generator 11-bus test system. Eigenvalue analysis and nonlinear simulation results have verified that the proposed method is capable of displacing eigenvalues into the specified area on the complex plan, and thus the PSS and TCSC controllors can effectively damp low frequency oscillation.
引文
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