Brushless doubly-fed motor speed regulation system based on matrix converter and sliding mode control method

Abstract

A brushless doubly-fed motor speed regulation system based on a matrix converter comprises the matrix converter, a brushless doubly-fed induction motor and a squirrel-cage induction motor, a power side stator winding of the brushless doubly-fed induction motor is directly connected with a power grid, and a control side stator winding of the brushless doubly-fed induction motor is connected with the output end of the power converter. The input end of the power converter is connected to a power grid through an input filter; the squirrel-cage induction motor is coaxially connected with the brushless doubly-fed induction motor and is used for providing load torque. The invention further comprises a sliding mode control method of the brushless doubly-fed motor speed regulation system based on the matrix converter. Static performance of the brushless doubly-fed induction motor speed regulation system can be guaranteed, good dynamic response performance can also be guaranteed under the condition of load and speed abrupt change, dependence of the technical scheme on parameters is small, the application range of brushless doubly-fed induction voltage is expanded, and the application range of the brushless doubly-fed induction motor speed regulation system is widened. And the industrial application process of the brushless doubly-fed induction motor can be promoted.

Description

technical field [0001] The invention relates to motor control technology, in particular to a brushless doubly-fed motor speed regulation system and a sliding mode control method based on a matrix converter. Background technique [0002] At present, the generators used for wind power generation mainly include three types: synchronous generators, doubly-fed generators and asynchronous generators. Among them, synchronous generators include permanent magnet synchronous generators and wound rotor synchronous generators, and asynchronous generators include squirrel cage asynchronous generators and wound rotor asynchronous generators. These types of generators have their own advantages and disadvantages. The structure of squirrel-cage asynchronous generators is simple and easy to maintain. However, the inrush current of squirrel-cage asynchronous generators is very large when starting. It is often necessary to equip a soft starter; the power density ratio of the permanent magnet s...

AI Technical Summary

Problems solved by technology

This kind of inverter needs a large capacitor in the middle to stabilize the voltage, which undoubtedly increases the size and cost of the inverter, but because the front stage is an uncontrolled rectification circuit, the input of this inverter cannot control, energy cannot flow in both directions

Therefore, on this basis, a dual-PWM inverter is derived. Different from the traditional "AC-DC-AC" inverter, the front stage of the dual-PWM inverter uses a PWM rectifier circuit, thus improving the traditional "AC". -The input of direct-ac inverter is uncontrollable and the energy cannot flow in both directions, but the problem of increasing the volume and cost of the inverter caused by the intermediate DC capacitor cannot be solved

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