一种提高多小水电群送出能力的PSS参数协调优化方法

摘要

A PSS parameters coordinated optimization algorithm based on PSO is proposed which improves the transmission capacities of multiple small hydropower station groups by increasing damping ratio of critical low frequency oscillation modes. Firstly, critical low frequency oscillation modes which influence the transmission capacities of small hydropower station groups are calculated. Then generators that participate in the PSS parameters optimization are selected based on the residue index which can comprehensively reflect the controllability and the observability of generators that involved in the critical low frequency oscillation mode. Lastly, the modified searching strategy is proposed to improve the efficiency of the PSO optimization searching. The proposed method is applied in Baoshan, Nujiang and Diqing small hydropower station groups in Dianxi area of Yunnan Power Grid to improve the total transmission capacity in Dianxi area. Simulation results show that the proposed method is feasible and effective.%提出了一种基于粒子群算法的PSS参数协调优化方法，通过增加主导低频振荡模式阻尼比的方式来提高小水电群的送出能力。所提方法首先计算出影响各小水电群送出能力的主导低频振荡模式。然后利用留数指标来筛选出参与PSS参数协调优化的机组，留数指标能够综合反映出机组参与主导低频振荡模式的可控性及可观性程度。最后提出了改进的PSO搜索策略以提高粒子群寻优的效率。将该方法应用到云南电网滇西地区的保山、怒江和迪庆三个小水电群中，以提高滇西地区小水电群的整体送出能力。计算结果表明提出的方法是可行和有效的。