Method, device and system for controlling a compressor

Abstract

The invention discloses a method, device and system for controlling a compressor. The method comprises the steps that input current input by an alternating current power source is obtained and input power pulse input to a PFC converter is reduced, wherein harmonic components at least include triple frequency harmonic components and / or quintuple harmonic components; after the input current into which the harmonic components are injected is input to the PFC converter, a PFC control circuit adjusts output power of the PFC converter by controlling on-off of a controllable switching tube in the PFC converter, so that the input power and the output power of the PFC converter are balanced. The technical problem that voltage ripples of a motor drive circuit are high due to the fact that no electrolytic capacitor exists in the prior art is solved.

Description

technical field [0001] The present invention relates to the field of compressor control, in particular, to a method, device and system for controlling a compressor. Background technique [0002] In order to replace electrolytic capacitors with small-volume and low-cost film capacitors, the motor drive system without electrolytic capacitors in the prior art has the following disadvantages: [0003] 1. Although the purpose of overvoltage protection can be achieved, the calculation is complicated due to the judgment of the Q-axis current compensation value, which increases the running time of the processor and reduces the response speed of the system. [0004] 2. Although the electronic circuit can be installed inside the motor to achieve mechatronics, it is not conducive to the maintenance of circuit components and motor parts in the later stage, and due to the corrosion inside the compressor, it cannot be used on the variable frequency drive system of the air conditioner exte...

AI Technical Summary

Problems solved by technology

[0003] 1. Although the purpose of overvoltage protection can be achieved, due to the judgment of the Q-axis current compensation value, the calculation is complicated, which increases the running time of the processor and reduces the response speed of the system

[0004] 2. Although the electronic circuit can be installed inside the motor to achieve mechatronics, it is not conducive to the maintenance of circuit components and motor parts in the later stage, and due to the corrosion inside the compressor, it cannot be used on the variable frequency drive system of the air conditioner external unit. application

However, it cannot solve the problem of bus voltage drop caused by replacing electrolytic capacitors with film capacitors, and cannot guarantee the smooth operation of the motor

[0006] Aiming at the technical problem of high voltage ripple in the electrolytic capacitor motor drive circuit in the prior art, no effective solution has been proposed yet

Images