A method for suppressing speed fluctuations of air-conditioning compressors

Abstract

The invention discloses an air conditioner compressor rotational speed fluctuation suppressing method. The method includes the following steps that: when an air conditioner compressor operates under a given rotational speed, a sinusoid represents by an equation that S(t)=Asin (omegat+P) is constructed; the amplitude A in the above equation is set as A=K*deltaIq / deltaN; the value of the amplitude A is kept constant, and the value of the initial phase P is adjusted, and an initial phase P under minimum speed fluctuation recorded, and the initial phase P at this moment is an optimal compensation phase; the value of K is adjusted according to the initial phase P under the under minimum speed fluctuation, and the adjustment value of K under the under minimum speed fluctuation is recorded, and a corresponding amplitude A is an optimal compensation amplitude; and the rotation speed N is adjusted, and the above steps are repeated, so that a plurality of groups of optimal compensation points are obtained; and when an air conditioner compressor operates, if the set rotation speed N is an optimal compensation point, a corresponding optimal amplitude A and initial phase P are selected, and if the set rotation speed N is not an optimal compensation point, a point insertion method is adopted to calculate an optimal amplitude A and an initial phase P at the set rotation speed N. With the air conditioner compressor rotational speed fluctuation suppressing method of the invention adopted, the problem of speed fluctuation caused by the cyclical pulsation of the load torque of the air conditioner compressor can be solved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for suppressing fluctuations in rotational speed of an air conditioner compressor. Background technique [0002] Permanent magnet synchronous motor (PMSM) has been widely used in chemical industry, textile, home appliances and other fields due to its high torque / inertia ratio, high power density, high operating efficiency, reliable structure, and excellent control performance. At present, in order to save energy and reduce consumption, it has become a trend to use permanent magnet synchronous motors to drive compressors in variable product air conditioning systems. [0003] During the operation of the air conditioner compressor, each operation cycle can be divided into two stages, namely, suction and exhaust. The two stages, such as figure 1 As shown, it is obvious that in this process, the difference in pressure in the process of suction and air compression cause...

AI Technical Summary

Problems solved by technology

Especially in the whole low-frequency process, the periodic nonlinear change of the compressor load torque will inevitably have a negative impact on the stable operation of the system, and the change of uncertain parameters will cause the final value of the system state variable to not follow well Changes in target setpoints, resulting in increased energy consumption during actual motor operation

What's more serious is that the mechanical jitter of the compressor is caused by the periodic change of the load, which constantly fails to meet the quiet standards related to the air-conditioning compressor, and causes mechanical loss and pipeline instability, which seriously affects the life of the equipment.

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