Speed changing constant frequency double feeding wind power generator exciting frequency variator based on super conductive magnetic storage energy

Abstract

This invention discloses an excitation frequency converter of a shift constant frequency double-feeding wind-driven generator based on superconduction magnetic energy storage including a superconduction magnet, a chopper, a current converter of the rotor side, a current converter of network side and a capacitor, in which, the chopper, the converters are connected to both ends of the capacitor, which provides support voltage to the chopper regulating the rotor excitation of the wind-driven generator by the current converter of the rotor side and carrying out exchange of active power and reactive power by the current converter of the network side and an interconnected power system, which utilizes the high efficient energy storage property of superconductive magnet to take it as the middle DC energy storage of the frequency converter to provide active and reactive compensation to the interconnected power system at the same time when controlling the slippage power exchange between the superconduction magnet and the rotor of the double-feeding wind-driven generator to realize the shift constant frequency operation.

Description

technical field [0001] The invention relates to a variable-speed constant-frequency double-fed wind power generator excitation converter. Background technique [0002] The operation of variable-speed constant-frequency double-fed wind turbine is mainly realized by the power control of the generator rotor by the excitation frequency converter. Therefore, the selection of the excitation frequency converter is very important for the variable-speed constant-frequency operation performance of the wind turbine. From the excitation frequency converter Considering the cost, main circuit, voltage transmission ratio, dynamic response speed, etc., the dual PWM converter is a common excitation frequency converter structure at present. Its control is simple, mature, reliable, low cost, and good control performance, so it has been obtained. Wide range of applications. However, during the variable speed and constant frequency operation of the wind turbine based on this excitation frequenc...

AI Technical Summary

Problems solved by technology

However, during the variable speed and constant frequency operation of the wind turbine based on this excitation frequency converter, the corresponding slip power exchange must be performed with the grid-connected power system through the generator rotor, and during the grid-connected operation, this power exchange will Affect the dynamic power balance of the grid-connected power system, which is not conducive to the stable operation of the wind power grid-connected power generation system

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