Abstract

Linear active disturbance rejection control (LADRC) is applied as power system stabilizer (PSS) in power systems to damp the low-frequency oscillations. A tuning method for second-order LADRC is proposed specifically for damping the low-frequency oscillations. The tuning method is based on its own structure (zeros and poles) and the oscillation frequencies that need to be damped, thus it is independent of system models and not restricted to single-machine-infinite-bus (SMIB) systems. Moreover, a method to analyze the robustness is proposed for SMIB systems using the structured singular value method. Simulation studies on a SMIB system and two multi-machine power systems show that LADRC is easy to tune and can achieve good performance in damping both the local modes and the inter-area modes, thus it has great potential in power system stability control.

摘要

线性自抗扰控制 (LADRC) 在电力系统中用作电力系统稳定器 (PSS) 以抑制低频振荡。提出了一种二阶 LADRC 调谐方法，专门用于抑制低频振荡。调谐方法基于其自身的结构（零点和极点）和需要阻尼的振荡频率，因此它独立于系统模型并且不限于单机无限总线（SMIB）系统。此外，提出了一种使用结构化奇异值方法对 SMIB 系统进行鲁棒性分析的方法。对一个 SMIB 系统和两个多机电力系统的仿真研究表明，LADRC 易于调谐，并且在抑制局部模态和区域间模态方面都具有良好的性能，