基于线性最优控制的交直流低频振荡附加阻尼控制器设计

Design of AC-DC low frequency oscillation controller with additional damping based on linear optimal control

对于低频振荡抑制问题,提出了一种新的电力系统稳定器(PSS)及直流附加控制的设计方法。通过改进的总体最小二乘-旋转不变(TLS-ESPRIT)辨识技术分析系统振荡特性,再对各个振荡模态分别辨识出相应的被控传递函数,最后利用带观测器的线性最优控制(LQR)方法设计出相应控制器,达到抑制低频振荡的目的。在设计过程中,利用基于LQR的PSS抑制区域内低频振荡,区域间低频振荡通过基于LQR的直流附加控制完成。

A new design way for power system stabilizer （PSS） and DC additionalcontroller to solve low frequency os- cillation （LFO） problem is proposed. The oscillation characteristics of the system are analyzed through total least squares-estimation of signal parameters via improved rotational invariance techniques （TLS-ESPRIT） firstly, and then the transfer functions of all oscillation modes are captured respectively. linear quadratic ea LFO and DC regulator （LQR） method with observer. In the designing additional LQR controller is used for inter-area LFO. Finally, the controllers are designed out by procedure, the LQR PSS is used for intra-ar-