基于一种扩张状态观测器的负荷频率控制

Load Frequency Control for Power Systems via Extended State Observer

在供电系统负荷稳定性控制问题的研究中,负荷频率控制(LFC)是保证供电质量及电力系统安全、可靠与经济运行的一种重要的手段。互联电力系统具有结构复杂,受非线性动态、模型不确定性及外部扰动等系统不确定因素影响,存在系统建模不精确,抗干扰要求高等问题。为提高电力系统稳定性,提出一种采用扩张状态观测器的PID控制器设计方法,并应用到电力系统的负荷频率控制中。上述方法基于线性自抗扰控制(LADRC)结构简单又不完全依赖系统模型、具有良好的鲁棒性的特点上,将闭环形式近似为PID控制器,以便其工程实现。仿真结果表明,改进方法控制效果良好,与传统的PID方法相比,抗负荷扰动性和鲁棒性更强,为供电系统稳定性优化提供了依据。

Load frequency control （LFC） is an important technique in providing good power quality and maintaining safety, reliability and economics of power systems. As interconnected power system has a complex structure, which is affected by the non-linear dynamics, model uncertainties and external disturbances and other uncertainties, so there are many problems such as system modeling inaccuracies and higher anti-interference requirements. There- fore, in order to improve the stability of the power system, this paper presented an extended state observer PID controller design method, and applied it to the load frequency control problems. This method is based on a linear active disturbance rejection control （LADRC） which has simple structure, not relies on the system model entirely, and is with good characteristics of robustness, to approximate a closed loop PID controller in order to achieve its projects. Simulation results show that the proposed method can achieve good performance compared with the traditional PID method, with better load disturbance rejection and robustness.