Optimization and restart control method for use in outage of large-inertial-load permanent magnet synchronous motor

Abstract

Disclosed is an optimization and restart control method allowing for minimum outage-restart instant impact of a large-inertial-load permanent magnet synchronous motor. Proper start parameters are obtained by updating a pre-start given rotation speed omega * and a position compensation error delta theta and by simulation with a voltage inverter, and an error limitation is provided for the given rotation speed omega *, the position compensation error delta theta, voltage inverter end voltage Uabc and counter electromotive force Eabc at the moment of start; before starting, conditions that the given rotation speed omega * and the position compensation error delta theta need to meet under minimum impact are analyzed according to a torque balance equation; the position compensation error delta theta and a difference delta omega * between the given rotation speed omega * and an actual rotation speed omega are continuously updated until starting begins according to the actual rotation speed and a amplitude difference-phase difference delta between end voltage simulated by an analog controller and the counter electromotive force Eabc; the concept of voltage analog controller is introduced, the difference between the counter electromotive force Eabc and the end voltage Uabc is analyzed, and an area allowing for minimum instant impact is obtained.

Description

technical field [0001] The invention designs a method for controlling optimal re-investment and minimum impact when a drive system of a permanent magnet synchronous AC motor with a large inertia load is over-electrically separated or recovers from a short-time interruption of power supply, and belongs to the technical field of AC motor transmission. Background technique [0002] In the field of AC transmission, compared with induction motors and other motors, permanent magnet synchronous motors have significant advantages such as small size, light weight, high efficiency and output power density, large starting torque, simple structure, reliable operation, and wide speed range. With the research and development of new permanent magnet materials and the reduction of production costs of permanent magnet materials, the research and development technology of permanent magnet synchronous motors is gradually maturing, and it has been widely used in national defense, industrial and ...

AI Technical Summary

Problems solved by technology

At present, the transient analysis of the power-off-restart of the motor is mainly focused on the induction motor, and only the simulation shows that the magnitude of the impact is related to the added voltage and phase, but there are not many specific theoretical analyzes. Moreover, there is no way to determine the specific influencing factors from the perspective of quantity and how to minimize the impact.

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