Air conditioner, variable-frequency speed regulation system and control method thereof

Abstract

The invention discloses an air conditioner, a variable-frequency speed regulation system and a control method thereof. The control method includes the steps of: detecting a three-phase current of a motor; estimating the position and the speed of a rotor of the motor to obtain an estimated angle and an estimated speed of the rotor; according to an input ramp signal, performing position correction on the estimated angle to obtain a given speed, performing differential calculation on the ramp signal, and superposing a calculation result to the given speed to obtain a target speed; according to the target speed, performing speed correction on the estimated speed to obtain a quadrature axis target current; and performing coordinate transformation on the three-phase current to obtain a direct axis current and a quadrature axis current, performing current correction on the direct axis current Id and the quadrature axis current Iq according to the direct axis target current and the quadrature axis current Iqref to obtain a direct axis voltage Vd and a quadrature axis voltage Vq, and controlling the motor according to the direct axis voltage Vd and the quadrature axis voltage Vq. The control method provided by the invention can improve speed regulation performance, and improve an energy-saving effect.

Description

technical field [0001] The invention relates to the technical field of frequency conversion speed regulation, in particular to a control method of a frequency conversion speed regulation system, a frequency conversion speed regulation system and an air conditioner with the frequency conversion speed regulation system. Background technique [0002] With the continuous development of society, people pay more and more attention to energy. Frequency conversion speed regulation technology has significant energy-saving effect and excellent speed regulation performance, and is widely used in air-conditioning, elevators, metallurgy, machinery, electronics, petrochemical, papermaking, textile and other industries. [0003] At present, traditional frequency conversion speed control systems usually use photoelectric encoders as measurement sensors. At the same time, due to cost considerations or working environment restrictions, some also use sensorless control methods. However, the s...

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Problems solved by technology

[0005] However, the energy-saving solutions in the prior art all take measures outside the frequency conversion speed regulation control system to adjust the given frequency to achieve the energy-saving effect, which does not solve or reduce the energy consumption of the control system itself, and the energy-saving effect is not good.

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