Guangdong Meizhi Compressor Co., Ltd.

Siqing Liao

Weimin Xiang

Wanjie Song

Xinjie Ren

Hong Guo

Cheng Zhang

Jijiang Yu

Yongjun Fu

Jingtao Yang

Guanfeng Luo

The present disclosure provides a method and a device for controlling a power factor on motor side and a system having the same, and the method includes: controlling the motor using a control approach of Id'=0 so as to obtain quadrature-axis voltage Uq&#x2032; and direct-axis voltage Ud&#x2032; in a virtual coordinate system of a current control cycle; calculating a first control value according to Uq&#x2032; and Ud&#x2032;; obtaining a power factor control target value, and calculating a target control value according to the power factor control target value; performing a PI control on a difference between the target control value and the first control value so as to obtain a coordinate deviation angle, and overlapping the coordinate deviation angle to a motor angle of the current control cycle so as to build a virtual coordinate system of a next control cycle, such that the power factor on the motor side is controllable.

Motor control system and method and device for controlling power factor on motor side

A method for suppressing a speed fluctuation of a permanent magnet synchronous motor is provided in the present disclosure, including: obtaining a target speed &#x3c9;_, a feedback speed, a fluctuation speed &#x394;&#x3c9;, a q-axis inductance Land a permanent magnet flux linkage &#x3c6;of the permanent magnet synchronous motor; performing a PI adjusting on &#x394;&#x3c9; to obtain a q-axis reference current I, and obtaining a q-axis target voltage U*according to I, &#x3c9;_, &#x394;&#x3c9; and &#x3c6;; performing a PI control on a q-axis actual voltage according to U*to obtain a q-axis compensation current I; obtaining a d-axis target voltage U*according to I, I, &#x3c9;_, &#x394;&#x3c9; and L; performing a PI control on a d-axis actual voltage according to U*to obtain a d-axis compensation current I; superposing Iand Ito perform a feedforward compensation on a q-axis current and superposing Iand the d-axis reference current to perform a feedforward compensation on a d-axis current.

Method for suppressing a speed fluctuation, a control apparatus and a compressor control system

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Foshan, China

Siqing Liao