直驱小惯量表贴式永磁同步电机的转速脉动抑制
Suppression of speed ripple for direct-drive small inertia surface permanent magnet synchronous motor

非线性电流测量误差和电压源逆变器(VSI)非线性畸变电压造成了直驱小惯量表贴式永磁同步电机(SPMSN) 的转速脉动. 本文将q轴非线性电流测量误差等效为扰动负载电流, 提出一种复合PI(CPI)调速器抑制电机转速脉动. 该调速器由传统PI调节器与偏差补偿器并联构成, 偏差补偿器用以抑制非线性负载电流. 同时, 用分段线性函数建 立IGBT关闭时间模型, 并推导了VSI非线性畸变电压表达式. 引入积分型模型预测控制(MPC)作为电流环控制器, 利用MPC的滚动时域最优预测特性抑制VSI的非线性畸变电压, 消除了零电流钳位现象. 最后, 通过仿真分析验证 了所提控制策略的有效性.
Nonlinear current measurement error and voltage source inverter (VSI) nonlinear distorted voltage produce the speed ripple of direct-drive small inertia surface permanent magnet synchronous motor (SPMSM). This paper presents a composite PI (CPI) speed controller to suppress the speed ripple. The proposed speed regulator consists of a conventional PI controller shunted with a deviation compensator. The deviation compensator can reject the q axis nonlinear current measurement error which acts as a nonlinear load current. Meanwhile, the turn-off time of IGBT is modeled by a piecewise linear function which is used to deduce the VSI nonlinear distorted voltage. Integral model predictive control (MPC) is introduced as current controller to suppress VSI nonlinear distorted voltage and eliminate the zero-current clamping phenomenon. At last,the simulation results verify the feasibility of the control strategy.