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通过构造扩张状态观测器(extended state observer,ESO)对发电机励磁系统模型误差和不确定外扰进行动态补偿,并运用反步法对补偿后的模型设计非线性解耦控制律。由于该方法对系统模型的非线性部分有选择地利用ESO进行动态补偿,既避免了运用反步法设计时自适应参数的引入,又能充分利用系统的特性,减轻ESO的估计负担,有效地兼顾了控制器鲁棒性及控制精度这两方面的要求。仿真表明:该方法鲁棒性强,参数易于选取,与比例–积分–微分(proportion-integration-differentiation,PID)+电力系统稳定(power system stabilizer,PSS)控制器励磁控制器相比较,具有更为优秀的动态品质,方法简单有效。
An extended state observer (ESO) is used to dynamically compensate model errors and uncertain external disturbances of generator excitation system, and a non-linear decoupling control law is designed for the compensated model by the backstepping method. Because this method selectively compensates the non-linear part of the system model by using ESO, it avoids the introduction of adaptive parameters when designing with backstepping method, and makes full use of the characteristics of the system to reduce the ESO’s estimation burden effectively Taking into account the controller robustness and control accuracy of these two requirements. The simulation results show that the proposed method is robust and easy to choose parameters. Compared with proportional-integration-differentiation (PID) + power system stabilizer (PSS) controller, For excellent dynamic quality, the method is simple and effective.