适应复杂电力系统多种运行方式的PSS优化配置

Optimal Allocating of PSS for Multi - machine System with Coordinating Multiple Operation Conditions

低频振荡的抑制是电力系统规划阶段和运行过程中必须考虑的一个重要问题。抑制低频振荡一般的方法是在励磁调节器上装设电力系统稳定器(PSS)。多机系统中,PSS的配置包括PSS安装位置的选择和参数整定。现有的研究工作主要考虑一种运行方式来进行PSS的优化配置,本文提出了一种同时适应系统的多种运行方式来进行PSS优化配置的方法。通过对西北电网三种典型运行方式的计算结果表明:为了获得更好的抑制低频振荡的效果,PSS的放大倍数不应限定为正值;如按一种运行方式对PSS的参数进行优化则对其它运行方式效果较差,而同时考虑多种运行方式,统一地进行PSS的优化配置则对各种运行方式都能良好地抑制低频振荡。

To damp low frequency oscillation is very important in power system planning and operation. The general approach for damping low frequency oscillation is to equip power system stabilizer (PSS) on the generator exciters. In the multi - machine system, the allocation of PSSs includes both selecting the position of PSS and determining their parameter settings. The existing methods mostly consider one operation condition only. In this paper, an optimization approach for allocating PSSs in multi - machine system suitable for multiple operation conditions is presented. The Northwest power grid with considering three typical operation conditions is taken as an example. The results indicate that, in order to damp low frequency oscillation more effectively, the gains of PSS should not be restricted to positive values. Also, the optimal parameters of PSS determined by one operation condition are not appropriate to the other operation conditions. However, if the PSSs are optimally allocated with taken the three operation conditions into consideration by the proposed method, the effect of damping low frequency oscillation of the system for all these operation conditions is remarkable.