Electroless control method of compressor

Abstract

The invention is suitable for the field of improvement of a non-electrolysis control technology, and provides a non-electrolysis control method of a compressor. The method comprises the following steps: S1, calculating a relation between instantaneous power of compressor operation and a power grid input phase through system modeling and theoretical analysis, and calculating a feed-forward component given by dq axis current; S2, taking an output result of input current closed-loop control as a given part of dq-axis current, and realizing the vector control of the compressor and the harmonic requirement of the grid-side incoming line current to complete the control of the compressor. A motor control algorithm is combined with power factor control, a relation between compressor operation instantaneous power and a power grid input phase is calculated theoretically, a feed-forward component given by dq-axis current is calculated, and then a closed-loop control result of input current is also used as a given part of the dq-axis current; therefore, the vector control of the compressor and the harmonic wave requirement of the grid-side incoming line current are realized at the same time.

Description

technical field [0001] The invention belongs to the technical improvement field of electrolysis control, and in particular relates to an electrolysis control method of a compressor. Background technique [0002] The master's thesis "High Power Factor Control of Air-conditioning Permanent Magnet Compressor Drive System without Electrolytic Capacitor" is the result of a cooperation project between Harbin Institute of Technology and Guangdong Midea Refrigeration Equipment Co., Ltd. The idea is to perform Fourier decomposition of the current in dq according to the double frequency of the grid frequency, and take the DC component and the fundamental wave component as the given current in dq. After experiments, the grid waveform sine degree and power factor obtained by this method Both are higher. [0003] However, the existing technology does not deduce the given method of dq-axis current in detail. The given value of dq-axis current can only be obtained offline, and it needs to...

AI Technical Summary

Problems solved by technology

[0003] However, the existing technology does not deduce the given method of the dq-axis current in detail. The given value of the dq-axis current can only be obtained offline, and it needs to be experimented, tested and corrected at different operating points and stored in the lookup table for online calling.

In this way, the matching of compressors becomes extremely cumbersome, and the workload is heavy. There is an urgent need for a method that can perform dq-axis current distribution online.

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