A global fast terminal sliding mode(GFTSM)-based model predictive torque control(MPTC)strategy is developed for permanent magnet synchronous motor(PMSM)drive system with only one phase current sensor.Generally two pha...A global fast terminal sliding mode(GFTSM)-based model predictive torque control(MPTC)strategy is developed for permanent magnet synchronous motor(PMSM)drive system with only one phase current sensor.Generally two phase-current sensors are indispensable for MPTC.In response to only one phase current sensor available and the change of stator resistance,a novel adaptive observer for estimating the remaining two phase currents and time-varying stator resistance is proposed to perform MPTC.Moreover,in view of the variation of system parameters and external disturbance,a new GFTSM-based speed regulator is synthesized to enhance the drive system robustness.In this paper,the GFTSM,based on sliding mode theory,employs the fast terminal sliding mode in both the reaching stage and the sliding stage.The resultant GFTSM-based MPTC PMSM drive system with single phase current sensor has excellent dynamical performance which is very close to the GFTSM-based MPTC PMSM drive system with two-phase current sensors.On the other hand,compared with proportional-integral(PI)-based and sliding mode(SM)-based MPTC PMSM drive systems,it possesses better dynamical response and stronger robustness as well as smaller total harmonic distortion(THD)index of three-phase stator currents in the presence of variation of load torque.The simulation results validate the feasibility and effectiveness of the proposed scheme.展开更多
为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一...为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一阶,在有效减少整体计算量的同时,降低对虚拟控制量的求导次数;然后,利用滑模观测器对加权平均电流进行观测,以减小LCL滤波器参数摄动对加权平均电流精度的影响;最后,依据所建立的等效系统模型设计反步控制器,控制并网电流。仿真与实验结果表明,所提控制策略具有良好的稳态性能和较高的鲁棒性。展开更多
基金supported by the National Natural Science Foundation of China(61463025).
文摘A global fast terminal sliding mode(GFTSM)-based model predictive torque control(MPTC)strategy is developed for permanent magnet synchronous motor(PMSM)drive system with only one phase current sensor.Generally two phase-current sensors are indispensable for MPTC.In response to only one phase current sensor available and the change of stator resistance,a novel adaptive observer for estimating the remaining two phase currents and time-varying stator resistance is proposed to perform MPTC.Moreover,in view of the variation of system parameters and external disturbance,a new GFTSM-based speed regulator is synthesized to enhance the drive system robustness.In this paper,the GFTSM,based on sliding mode theory,employs the fast terminal sliding mode in both the reaching stage and the sliding stage.The resultant GFTSM-based MPTC PMSM drive system with single phase current sensor has excellent dynamical performance which is very close to the GFTSM-based MPTC PMSM drive system with two-phase current sensors.On the other hand,compared with proportional-integral(PI)-based and sliding mode(SM)-based MPTC PMSM drive systems,it possesses better dynamical response and stronger robustness as well as smaller total harmonic distortion(THD)index of three-phase stator currents in the presence of variation of load torque.The simulation results validate the feasibility and effectiveness of the proposed scheme.
文摘为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一阶,在有效减少整体计算量的同时,降低对虚拟控制量的求导次数;然后,利用滑模观测器对加权平均电流进行观测,以减小LCL滤波器参数摄动对加权平均电流精度的影响;最后,依据所建立的等效系统模型设计反步控制器,控制并网电流。仿真与实验结果表明,所提控制策略具有良好的稳态性能和较高的鲁棒性。
