基于实测相频特性的电力系统稳定器参数设计

摘要

电力系统稳定器是抑制电力系统低频振荡最为有效的措施之一,其参数整定比较复杂和困难.该文依据实测的励磁系统未补偿相频特性,以励磁系统所需要补偿相位的平方与电力系统稳定器可提供相位的平方差的绝对值之和达到最小为优化目标,采用Levenberg-Marquardt优化算法,求取电力系统稳定器超前/滞后环节参数.现场机组实测相频特性的仿真结果表明,该文优化得到的电力系统稳定器参数,能较好地改善相关模式的阻尼特性,抑制电力系统低频振荡.%Power system stabilizer (PSS) is one of the most effective measures to damp the low frequency oscillation in the power system,and its parameter setting is comparatively complex and difficult.According to the measured uncompensated phase frequency characteristics of the excitation system,and based on the objective function of minimizing the sum of absolute value of the difference between the square of compensation phase required by excitation system and the square of PSS phase,this paper uses Levenberg-Marquardt optimization algorithm to obtain the PSS lead/lag link parameters.Based on the measured phase frequency characteristics,the simulation result shows that the proposed method can effectively improve the damping characteristics in certain mode and restrain the low frequency oscillation in the power system.The optimization of this paper mainly helps the PSS provide the excitation system with enough phase compensation,and it is noted that Levenberg-Marquardt optimization algorithm is applied to this area for the first time.