Switched reluctance motor regenerative braking control method based on current prediction

A switched reluctance motor, current prediction technology, applied in motor generator control, electronic commutation motor control, AC motor control and other directions, can solve problems such as large fluctuation of braking current and affecting motor stability.

Active Publication Date: 2020-06-12
CHANGSHA JINMA METALLURGICAL EQUIP
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the above-mentioned braking control methods all have the problem that the braking current fluctuates greatly during the braking process, which affects the smoothness of the motor braking operation.

Method used

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  • Switched reluctance motor regenerative braking control method based on current prediction
  • Switched reluctance motor regenerative braking control method based on current prediction
  • Switched reluctance motor regenerative braking control method based on current prediction

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Embodiment Construction

[0079] The present invention will be further described below in conjunction with the drawings and embodiments.

[0080] Such as figure 1 As shown, figure 1 It is a functional block diagram of the regenerative braking control system of a switched reluctance motor based on current prediction of the present invention. The control system adopts a double closed-loop control mode including an outer speed loop and an inner current loop. The outer speed loop uses the PI control algorithm, and the current inner loop uses the current predictive control method. Its basic working principle is: real-time detection of the actual speed of the switched reluctance motor, and compare it with the given speed, the deviation is processed by the PI control algorithm to obtain the expected reference current of the inner loop; the inner loop is based on the expected reference At the same time, the power supply voltage in the power conversion circuit and the actual braking current of each phase winding...

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Abstract

The invention discloses a switched reluctance motor regenerative braking control method based on current prediction. The method comprises the steps: establishing a voltage balance equation; discretizing a current differential term in the voltage balance equation to obtain a function relational expression of the predicted braking current of each phase winding; performing calculating to obtain a predicted brake current error of each phase winding at the current sampling moment; performing calculating to obtain the corrected predicted braking current of each phase winding at the next sampling moment; performing calculating to obtain an expected reference current of the motor at the next sampling moment; constructing a target function, and performing traversal optimization on a state vector ofa power switch corresponding to a power conversion circuit in the motor speed regulation system to obtain an optimal value of the state vector; and controlling a corresponding power switch in the speed regulation system according to the optimal value. According to the invention, the problem of large fluctuation of the brake current in a traditional control method is effectively overcome, and theaccurate control of the brake current is realized, so the brake current and the brake torque in the brake process are basically kept stable.

Description

Technical field [0001] The invention relates to the field of switched reluctance motors, in particular to a regenerative braking control method of a switched reluctance motor based on current prediction. Background technique [0002] Switched reluctance motors have a series of advantages such as small starting current, large starting torque, wide speed range, high efficiency, and many controllable parameters. They have been widely used in many fields such as electric vehicles, wind power generation, and locomotive traction. However, under some operating conditions that require frequent braking, acceleration and deceleration, the switched reluctance motor generates a lot of energy loss due to frequent braking operation, which not only causes a lot of energy loss, but also seriously affects the normal operation of the equipment. It is of great significance to carry out research on regenerative braking control of switched reluctance motors. [0003] At present, a lot of research has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/36H02P21/22H02P25/098
CPCH02P21/36H02P21/22H02P25/098
Inventor 张小平张光辉姜海鹏陈娟张铸
Owner CHANGSHA JINMA METALLURGICAL EQUIP
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