The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the ...The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the design of stabilizing controllers. A PWM-based current-sensorless robust sliding mode controller is developed that requires only the measurement of the output voltage. An extended state observer is developed to estimate a lumped uncertainty signal that comprises the uncertain load power and the input voltage, the converter parasitics, the component uncertainties and the estimation of the derivative of the output voltage needed in the implementation of the controller. A linear sliding surface is used to derive the controller, which is simple in its design and yet exhibits excellent features in terms of robustness to external disturbances, parameter uncertainties, and parasitics despite the absence of the inductor’s current feedback. The robustness of the controller is validated by computer simulations.展开更多
【目的】为提高交流电力弹簧(AC electric spring,ACES)在负载投切和网侧电压波动场景下稳定关键性负载(critical load,CL)电压的能力,提出一种模型预测电流控制(model predictive current control,MPCC)策略。【方法】首先,针对可变负...【目的】为提高交流电力弹簧(AC electric spring,ACES)在负载投切和网侧电压波动场景下稳定关键性负载(critical load,CL)电压的能力,提出一种模型预测电流控制(model predictive current control,MPCC)策略。【方法】首先,针对可变负载工况,将关键性负载电流参考模型搭建为下一时刻关键性负载参考电压与当前时刻关键性负载等效阻抗值之比,通过可变的关键性负载电流参考值,提高了负载投切时ACES的动态响应能力。其次,针对关键性负载电压波动,控制策略通过ACES工作在不同的模式,使得关键性负载电流预测值追踪变化的电流参考值,从而使关键性负载电压追踪给定值。【结果】所提控制策略在负载投切和网侧电压波动的工况下,将关键性负载电压波动抑制在0.45%以内的同时兼顾了非关键性负载的电能质量,并且关键性负载电压的畸变率被控制在0.6%以下。【结论】该控制策略有效地提高了电力弹簧抑制负载电压波动的能力,为电力弹簧并入电网的工作提供了参考。展开更多
文摘The boost converter feeding a constant power load (CPL) is a non-minimum phase system that is prone to the destabilizing effects of the negative incremental resistance of the CPL and presents a major challenge in the design of stabilizing controllers. A PWM-based current-sensorless robust sliding mode controller is developed that requires only the measurement of the output voltage. An extended state observer is developed to estimate a lumped uncertainty signal that comprises the uncertain load power and the input voltage, the converter parasitics, the component uncertainties and the estimation of the derivative of the output voltage needed in the implementation of the controller. A linear sliding surface is used to derive the controller, which is simple in its design and yet exhibits excellent features in terms of robustness to external disturbances, parameter uncertainties, and parasitics despite the absence of the inductor’s current feedback. The robustness of the controller is validated by computer simulations.
文摘【目的】为提高交流电力弹簧(AC electric spring,ACES)在负载投切和网侧电压波动场景下稳定关键性负载(critical load,CL)电压的能力,提出一种模型预测电流控制(model predictive current control,MPCC)策略。【方法】首先,针对可变负载工况,将关键性负载电流参考模型搭建为下一时刻关键性负载参考电压与当前时刻关键性负载等效阻抗值之比,通过可变的关键性负载电流参考值,提高了负载投切时ACES的动态响应能力。其次,针对关键性负载电压波动,控制策略通过ACES工作在不同的模式,使得关键性负载电流预测值追踪变化的电流参考值,从而使关键性负载电压追踪给定值。【结果】所提控制策略在负载投切和网侧电压波动的工况下,将关键性负载电压波动抑制在0.45%以内的同时兼顾了非关键性负载的电能质量,并且关键性负载电压的畸变率被控制在0.6%以下。【结论】该控制策略有效地提高了电力弹簧抑制负载电压波动的能力,为电力弹簧并入电网的工作提供了参考。
