Flux-Weakening Control of Nonsalient Pole PMSM Having Large Winding Inductance, Accounting for Resistive Voltage Drop and Inverter Nonlinearities
Flux-Weakening Control of Nonsalient Pole PMSM Having Large Winding Inductance, Accounting for Resistive Voltage Drop and Inverter Nonlinearities
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DOI：
10.1109/tpel.2011.2159398
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发表时间：
2012-02-01
影响因子：
6.7
通讯作者：
Qi, Xiaoye
中科院分区：
文献类型：
--
作者：
Liu, Hesong;Zhu, Z. Q.;Qi, Xiaoye
提出了一种改进的弱磁控制方法，以改善绕组电感大、功率比为无穷大的隐极永磁同步电动机的驱动性能。该方法由两部分组成。第一部分利用幅度误差最小的过调制块的输入和输出之间的电压差来修改d轴基准电流。第二部分利用补偿后的Q轴电压，考虑了阻性压降和逆变器非线性引起的电压失真，检测最大每电压扭矩(MTPV)线。在MTPV条件下，提出了一种带低通滤波器的PI控制器来修正Q轴电流基准。结合这两个部分，所提方法的母线电压利用率接近六步运行，实际电流轨迹接近理想的MTPV线路。结果，整个弱磁区的驱动性能以最大化输出扭矩/功率为目标进行了优化。该方法在暂态响应方面也表现出了良好的性能。实验结果验证了该方法的有效性和优越性。
This paper proposes an improved flux-weakening control method to improve the drive performance of nonsalient pole permanent magnet synchronous motors having large winding inductance and consequently an infinite constant power speed ratio. The proposed method consists of two parts. The first part utilizes the voltage differences between the input and output of a minimum-magnitude-error over-modulation block to modify the d-axis current references. The second part uses the compensated q-axis voltage, in which the resistive voltage drop and the distorted voltage due to inverter nonlinearities are taken into account, to detect the maximum torque per voltage (MTPV) line. Under the MTPV condition, a PI controller with a low-pass filter is presented to modify the q-axis current reference. With these two parts, the bus voltage utilization in the proposed method is close to the six-step operation and the actual current trajectory approaches the ideal MTPV line. As a result, the drive performance in the whole flux-weakening region is optimized in terms of maximizing the output torque/power. The method also shows a good performance in transient response. Effectiveness and superiorities of the proposed method are verified by experimental results.