双三相永磁同步电机多谐波电流协同控制策略

Control Strategies of Dual Three-phase Permanent Magnet Machines With Multi-harmonics

利用双三相永磁同步电机的定子电流中低次谐波电流,可以提升电机的输出转矩。虽然控制五、七次谐波电流相对简单、易于实现,但提升电机的输出转矩有限。尽管三次谐波电流能够有效地提升电机的输出转矩,但其控制复杂。为解决电机电流维数利用不足的问题,将传统的两空间矢量控制算法推广至零序子空间,实现对基波电流、三次谐波电流和五、七次谐波电流的解耦控制,能够充分利用双三相电机的谐波电流,提高双三相电机的控制性能。实验结果验证了三空间矢量控制策略的可行性和多谐波电流协同控制提升系统输出转矩的有效性。

The average torque of dual three-phase permanent magnet machines can be improved by harmonic current injection.Specific harmonics are decomposed into different sub-spaces.Compared with the 3 rd harmonic,5 th and 7 th harmonic currents injected into z1-z2 subspace limits the improvement of output torque.Thus,multi-harmonic injections of 3 rd,5 th and 7 th are the optimal control strategy for increasing output torque of dual three-phase machines.Optimal injection ratios of harmonics were analyzed.The traditional dual-plane vector control algorithm of dual three-phase permanent magnet machines was extended to the zero-sequence subspace.It can be achieved decoupling control of fundamental currents,5 th and 7 th harmonic currents and 3 rd harmonic currents.Experimental results demonstrate the feasibility of the triple-plane vector control method and the effectiveness of output torque improved by multi-harmonic current injection.