Control method and system of compressor

Abstract

The invention discloses a control method and system of a compressor. The control method of the compressor comprises the following steps of obtaining the target rotational speed and the feedback rotational speed of the compressor, and generating a speed error fluctuation signal according to the target rotational speed and the feedback rotational speed; performing speed loop adjustment on the speed error fluctuation signal to generate an output load moment reference signal; generating a moment compensation angle signal according to an absolute speed error fluctuation signal, generating a moment compensation amplitude signal according to the absolute speed error fluctuation signal and the output load moment reference signal, and generating a feed-forward moment compensation signal according to the moment compensation angle signal and the moment compensation amplitude signal; generating an output moment according to the output load moment reference signal and the feed-forward moment compensation signal; performing electric current loop adjustment on the output moment to generate a motor control signal; controlling the compressor according to the motor control signal. According to the control method of the compressor, feed-forward compensation is performed on the output moment, and vibration during the low-frequency operation of the compressor can be effectively restrained.

Description

Technical field [0001] The present invention relates to the technical field of inverter compressors, in particular to a compressor control method and a compressor control system. Background technique [0002] In recent years, with the rapid development of frequency conversion control technology and the promotion of the concept of high efficiency and energy saving, frequency conversion air conditioners have been rapidly promoted and applied. Among them, the inverter air conditioner achieves the purpose of controlling the room temperature by changing the power supply frequency of the compressor and adjusting the speed of the compressor speed. It has the advantages of small room temperature fluctuation, low power consumption, and high comfort. [0003] At present, all energy-efficient inverter air conditioners on the market use DC inverter compressors, and the DC inverter compressors are powered by permanent magnet synchronous motors. Among them, the DC variable frequency single-cyli...

AI Technical Summary

Problems solved by technology

Among them, DC variable frequency single-cylinder compressors below 2HP are the mainstream products. However, single-cylinder compressors have the characteristics of uneven load. In the air-conditioning vector control system, the speed loop bandwidth is low, which will cause the electromagnetic torque to fail to track the actual load. Torque, so the vibration is larger at low frequency, so the single-cylinder compressor needs to add torque compensation to run stably at low frequency

However, in the prior art, ordinary sinusoidal torque compensation needs to find the best angle value and the best amplitude value according to the vibration in the air conditioni

Images