Megawatt grade brushless slip ring double-fed wind generator/motor and control method thereof

Abstract

The invention discloses a megawatt grade brushless double-fed wind generator / motor, comprising a stator, a rotor and a bidirectional rectifying inverter, wherein the stator is provided with two sets of individual sinusoidal distributed windings, the numbers of poles of the individual distributed windings are respectively 2p and 2q, the 2p stator winding is used as a main power winding and is directly connected with an electric net, the 2q stator winding is used as a power control winding and is connected with the electric net or an external circuit by the bidirectional rectifying inverter. The megawatt grade brushless double-fed wind generator / motor has excellent suitability, and not only can be designed as a direct-driving wind generating system, but also can be designed as a wind generating system with a one-grade or multi-grade accelerating gearbox. The wind generator / motor has simple structure, thereby greatly improving the reliability and greatly reducing the cost of operation and maintenance.

Description

technical field [0001] The present invention relates to a double-fed wind power generator / motor (hereinafter referred to as a megawatt-level brushless double-fed motor) with a megawatt level and a brushless slip ring, and also relates to the megawatt-level brushless double-fed motor as a different A control method used in a motor system belongs to the technical field of motors and their control. Background technique [0002] In recent years, as a renewable clean energy, wind power has been highly valued by governments, energy circles and environmental protection circles all over the world. There is a large amount of wind power resources on the earth. The use of wind power to generate electricity is clean and pollution-free, with short construction periods, flexible investment, and less land occupation. It has good economic and social benefits. [0003] According to the statistics of relevant research institutions, wind power generation accounts for about 0.7% of the world's...

AI Technical Summary

Problems solved by technology

[0011] The direct-drive permanent magnet synchronous generator developed for the obvious shortcomings of the double-fed asynchronous wind turbine system with a gearbox, because the direct drive does not require a gearbox, brushes and slip rings, thus greatly improving the performance of the system. The reliability of operation, but the motor runs at low speed, the number of poles of the motor increases, the volume becomes larger, and a full-power rectifier inverter is also required, and more importantly, there may be a danger of permanent magnet loss of magnetism during operation , leading to the scrapping of the entire generator, and due to the permanent magnet excitation, the flexible control of active power and reactive power cannot be realized

Compared with the doubly-fed asynchronous generator, the capacity of the rectifier inverter is greatly increased, the manufacturing and installation of the permanent magnet is complicated, and there will be loss of magnetism, which leads to a significant increase in the construction, operation and maintenance costs of the system

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