基于逆变器功率调节的永磁电机无电解电容控制策略

Control Strategy of Electrolytic Capacitor-less Permanent Magnet Synchronous Motor Drive Based on Regulation of Inverter Power

永磁同步电机无电解电容驱动系统具有寿命长和功率密度高的优点。为了提高无电解电容永磁电机驱动系统的功率因数,并减小输入电流谐波,研究一种基于逆变器输出功率调节的无电解电容控制策略。在建立输入电流与负载功率关系基础上,设计基于逆变器输出功率的比例谐振控制器,其输出作为交轴电流给定,实现功率波动量的同步跟踪。同时,直轴电流采用弱磁控制方式且与输入电网电压同步。最后,通过空调实验平台验证了基于逆变器输出功率控制的无电解电容驱动器高功率因数控制算法的有效性。

Electrolytic capacitor-less permanent magnet synchronous motor drive has the advantages of long life and high power density. In order to improve the input power factor and reduce the harmonics of the grid current in the electrolytic capacitor-less motor drive system, a novel control method based on the regulation of the inverter power is proposed in this paper. On the basis of the establishment of the relationship between the grid current and the inverter power, a proportional-resonant controller is designed to regulate the inverter power, the output of which is regarded as the reference of the q-axis current. Meanwhile, the generation of d-axis flux-weakening current is synchronous with the phase of the grid voltage. The effectiveness of the proposed method is demonstrated by the experiment results on an air conditioner. © 2016 Chin. Soc. for Elec. Eng.