【摘要】 针对统一潮流控制器(UPFC)阻尼控制器在镇定信号传输存在时滞时会导致电力系统阻尼性能降低甚至失稳的问题,建立计及信号传输时滞的UPFC阻尼控制模型,提出综合考虑阻尼比和时滞稳定裕度的UPFC阻尼控制策略设计方法,将该设计问题转化为约束优化问题,并提出求解该问题的双层优化结构算法(TLOSA),其内层采用基于自由权矩阵的线性矩阵不等式(LMI)方法求解电力系统时滞稳定裕度,外层采用粒子群优化算法获取最优阻尼控制策略。研究结果表明:该算法具有保守性低和易于实现等优点;利用该方法可以获得最优的UPFC阻尼控制策略,使得电力系统既能有效阻尼低频振荡,又能容忍一定的信号传输时滞。更多还原

【Abstract】 Damping controller of unified power flow controller(UPFC) may degrade its damping performance or even cause power system instability when its stabilizing signal is delayed for a certain period. Based on the newly constructed UPFC damping control model with signal transmission delay, UPFC damping control strategy design problem was discussed by taking into account of damping ratio and delay margin. The design problem was converted to a constrained optimization problem and then a two-layer optimization structure algorithm(TLOSA) was proposed to solve it. In TLOSA, delay margin was solved by free-weight matrix based linear matrix inequality(LMI) method for inner layer and optimal damping control strategy was searched by particle swarm optimization for outer layer. The results show that the proposed algorithm has low conservativeness and is easy to be implemented. The proposed algorithm can obtain optimal UPFC damping control strategy which ensures that power system can damp low frequency oscillation effectively and tolerance a certain signal transmission delay.更多还原