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针对精确反馈线性化(EFL)的非线性控制器鲁棒性差、结构复杂的缺点,提出了基于扩张状态观测器(ESO)的多机电力系统汽门和励磁的非线性分散协调控制策略。同时给出了基于EFL的分散协调控制策略。数字仿真表明,当标称参数与电网实际一致时,基于ESO的非线性控制器能达到EFL控制器的非线性控制效果,但基于ESO的非线性控制器设计无需电网的有关参数,在标称参数与实际电网参数有误差时,基于ESO的非线性控制器较EFL具有更佳的鲁棒性和适应性。
In order to overcome the poor robustness and complex structure of the nonlinear feedback controller based on exact feedback linearization (EFL), a nonlinear decentralized coordinated control strategy based on extended state observer (ESO) is proposed for multi-machine power system. At the same time, a decentralized coordination control strategy based on EFL is given. The numerical simulation shows that the ESO-based nonlinear controller can achieve the nonlinear control effect of the EFL controller when the nominal parameters are exactly the same as the power grid. However, ESO-based nonlinear controller design does not need the relevant parameters of the power grid. ESO-based nonlinear controllers have better robustness and adaptability than EFL when the parameters are different from the actual grid parameters.