针对传统弱磁控制策略在深度弱磁区域电流、转矩脉动较大,电流调节器易饱和等问题,提出一种基于q轴电流增量与误差积分的深度弱磁控制策略。通过q轴电流误差积分减缓q轴电流变化率,抑制电流调节器饱和；再根据最大转矩电压比曲线对d轴电流限幅,确定q轴电流增量,重新规划PMSM弱磁电流轨迹；结合电流环模糊PI控制,进一步抑制深度弱磁区域电流、转矩振荡。仿真结果表明:该弱磁控制策略下,系统在深度弱磁区域的电流、转矩振荡及电流调节器饱和得到了明显抑制,系统运行稳定。

Aiming at the problems of the traditional fieldweakening technology such as large current and torque ripple and current regulator easily saturated in deep fieldweakening operation, a deep fieldweakening control strategy based on increment and error integration of qaxis current was presented. Firstly, the qaxis current change rate was slowed down by qaxis current error integral control to restrain the current regulator from saturation. Then according to the curve of the maximum torque per voltage limit daxis current, giving the qaxis current increment, replanning PMSM fieldweakening current trajectory. Combined with the current loop fuzzy PI, to further inhibit the current and torque ripple in deep fieldweakening operation. The simulation results showed that under the fluxweakening control strategy, the ripple of current and torque and the saturation of the current regulator in deep fieldweakening operation were obviously restrained, and the system was stable.

TM 301.2

辽宁省自然科学基金重点项目(20170540141);辽宁省自然科学基金项目(201602130)