This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor...This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor(PMSM) in d-q frame and its space-state equation are established. The slide model control method is used to estimate the electromotive force of PMSM under static frame, while the position of rotor and its actual speed are estimated by using phase loop lock(PLL) method. Next,using Lyapunov stability theorem, the asymptotical stability condition of the slide model observer is presented. Furthermore, based on the backstepping control theory, the PMSM rotor speed and current tracking backstepping controllers are designed, because such controllers display excellent speed tracking and anti-disturbance performance. Finally, Matlab simulation results show that the slide model observer can not only estimate the rotor position and speed of the PMSM accurately, but also ensure the asymptotical stability of the system and effective adjustment of rotor speed and current.展开更多
特高压直流输电(ultra high voltage direct current,UHVDC)故障对电网影响严重,建立精确的可靠性模型十分必要。交流滤波器(ACfilter,ACF)子系统与交流母线并联,可补偿无功,减少谐波。谐波过大或无功不足均可能导致UHVDC降额。提出一...特高压直流输电(ultra high voltage direct current,UHVDC)故障对电网影响严重,建立精确的可靠性模型十分必要。交流滤波器(ACfilter,ACF)子系统与交流母线并联,可补偿无功,减少谐波。谐波过大或无功不足均可能导致UHVDC降额。提出一种计及无功补偿和谐波特性的ACF可靠性模型,用矩阵组合将单一型号滤波器状态空间(state space,SS)合并成ACF所有配置方案的SS模型。由ACUHVDC基波潮流确定ACF需提供无功容量等级,进而将配置方案分组。由谐波潮流计算各配置方案的谐波指标,若谐波电流超标,将配置方案移至容量等级较低分组。根据分组情况,合并配置方案为五状态容量模型。算例表明,配置方案按无功补偿分组后,可能会因不满足滤波指标而被移至0%CL分组,故0%CL状态概率可能比75%CL、50%CL或25%CL状态高。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
基金supported by National Natural Science Foundation of China(Nos.61104072 and 11271309)
文摘This paper presents a backstepping control method for speed sensorless permanent magnet synchronous motor based on slide model observer. First, a comprehensive dynamical model of the permanent magnet synchronous motor(PMSM) in d-q frame and its space-state equation are established. The slide model control method is used to estimate the electromotive force of PMSM under static frame, while the position of rotor and its actual speed are estimated by using phase loop lock(PLL) method. Next,using Lyapunov stability theorem, the asymptotical stability condition of the slide model observer is presented. Furthermore, based on the backstepping control theory, the PMSM rotor speed and current tracking backstepping controllers are designed, because such controllers display excellent speed tracking and anti-disturbance performance. Finally, Matlab simulation results show that the slide model observer can not only estimate the rotor position and speed of the PMSM accurately, but also ensure the asymptotical stability of the system and effective adjustment of rotor speed and current.
文摘特高压直流输电(ultra high voltage direct current,UHVDC)故障对电网影响严重,建立精确的可靠性模型十分必要。交流滤波器(ACfilter,ACF)子系统与交流母线并联,可补偿无功,减少谐波。谐波过大或无功不足均可能导致UHVDC降额。提出一种计及无功补偿和谐波特性的ACF可靠性模型,用矩阵组合将单一型号滤波器状态空间(state space,SS)合并成ACF所有配置方案的SS模型。由ACUHVDC基波潮流确定ACF需提供无功容量等级,进而将配置方案分组。由谐波潮流计算各配置方案的谐波指标,若谐波电流超标,将配置方案移至容量等级较低分组。根据分组情况,合并配置方案为五状态容量模型。算例表明,配置方案按无功补偿分组后,可能会因不满足滤波指标而被移至0%CL分组,故0%CL状态概率可能比75%CL、50%CL或25%CL状态高。
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。
