Compound control method based on vector control system of permanent magnet synchronous motor

Abstract

The invention discloses a compound control method based on a vector control system of a permanent magnet synchronous motor. The method comprises the following steps: converting a three-phase current of the permanent magnet synchronous motor into equivalent currents on a straight shaft and a crossed shaft by utilizing a vector conversion principle; further linearly decoupling the mathematical models of shafts d and q of the permanent magnet synchronous motor by using the method of id=0; and using fractional order PIgammaDmu control and sliding mode variable structure compound control, wherein the fractional order PIgammaDmu control and the sliding mode variable structure compound control can be used for performing joint cross-feedback control on the speed ring through a variable weighting factor alpha. The compound control method based on a vector control system of a permanent magnet synchronous motor, provided by the invention, has the advantages of both the fractional order PIgammaDmu control and the sliding mode variable structure compound control during the control of the speed ring, and the favorable factors are maximized while the unfavorable factors are minimized. Compared with the traditional PID (proportional-integral derivative) control, the fractional order PIgammaDmu control has a widened control scope, thereby more flexibly matching the sliding mode variable structure to realize the compound control to the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to the technical field of AC motor drive, in particular to a composite control method based on a permanent magnet synchronous motor vector control system. Background technique [0002] With the continuous development of the economy, automobiles have become one of the indispensable means of transportation in people's lives, and the automobile industry has become an important pillar industry of the national economy. As a green means of transportation, electric vehicles have a clear and unique banner. In recent years, consumers and governments have become more aware of environmental protection and the world's energy prices have continued to skyrocket. As a new energy vehicle with zero emissions and no pollution, electric vehicles are favored by people in the automotive industry. As the control core of the electric vehicle, the motor and its drive control system directly affect the performance of the electric vehicle. The limited sp...

AI Technical Summary

Problems solved by technology

At present, the permanent magnet synchronous motor (PMSM) vector control system generally adopts the speed and current double closed-loop control method, and most of the speed control uses the traditional PID controller. Although the traditional PID control is simple in principle, robust and stable, But the speed and anti-jamming ability are very limited

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