Current Control for Dual Three-Phase Permanent Magnet Synchronous Motors Accounting for Current Unbalance and Harmonics
Current Control for Dual Three-Phase Permanent Magnet Synchronous Motors Accounting for Current Unbalance and Harmonics
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DOI：
10.1109/jestpe.2014.2299240
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发表时间：
2014-01
影响因子：
5.5
通讯作者：
Yashan Hu;Z. Zhu;Kan Liu
中科院分区：
文献类型：
--
作者：
Yashan Hu;Z. Zhu;Kan Liu
本文提出了一种改进的矢量空间分解电流控制方案，适用于具有两组空间偏移 30° 电角度的三相绕组的双三相永磁 (PM) 同步电机。为了消除αβ子平面中的电流不平衡，开发了比例积分（PI）和谐振（二次）控制器，无论电流不平衡的程度如何，该控制器都有效，而PI加多频谐振（二次和六次）控制则用于消除z1z2子平面中的电流不平衡以及五次和七次电流谐波。与现有方法仅考虑z1z2子平面的电流不平衡相比，该方法考虑了z1z2和αβ子平面的电流不平衡，并且可以在稳态运行时同时消除它们。从而实现电流不平衡的充分补偿，既消除了两组之间的电流不平衡，又消除了每组相绕组之间的电流不平衡。同时，非正弦反电动势和逆变器非线性引起的五次和七次电流谐波也能得到充分补偿。通过在双三相永磁电机原型系统上进行的一组对比实验验证了该方法的有效性。结果表明，在稳定运行状态下可以实现完全平衡的电流，没有五次和七次电流谐波。
This paper proposes an improved vector space decomposition current control scheme for dual three-phase permanent magnet (PM) synchronous motors having two sets of three-phase windings spatially shifted by 30° electrical degrees. A proportional-integral (PI) and resonant (second) controller is developed for eliminating the current unbalance in αβ subplane, which is effective irrespective of the degree of current unbalance, while PI plus multifrequency resonant (second and sixth) control is employed to eliminate the current unbalance, fifth and seventh current harmonics in z1z2 subplane. Compared with existing methods only accounting for current unbalance in z1z2 subplane, the proposed method has considered the current unbalances in both z1z2 and αβ subplanes and can eliminate them simultaneously at the steady-state of operation. Consequently, the full compensation of current unbalance can be achieved, by which both the current unbalance between two sets and current unbalance between phase windings in each set are eliminated. Meanwhile, the fifth and seventh current harmonics caused by nonsinusoidal back electromotive force and inverter nonlinearity can also be fully compensated. The effectiveness of proposed method is verified by a set of comparative experiments on a prototype dual three-phase PM machine system. It shows that fully balanced currents without the fifth and seventh current harmonics at the steady state of operation can be achieved.