Resonance restraining method for grid connection wind driven generator units

Abstract

The invention relates to a resonance restraining method for grid connection wind driven generator units. All phases at the positions, connected to a power grid, of the grid connection wind driven generator units are connected with a first electric reactor, a second electric reactor and a third reactor in series respectively. The neutral point on the side where the high voltage of the grid connection wind driven generator units is changed into the low voltage is provided with a fourth electric reactor. A fifth electric reactor and a sixth electric reactor are connected between a generator side converter and a grid side converter of a double-fed type wind driven generator unit in series, and a first filter capacitor is connected between the generator side converter and the grid side converter of the double-fed type wind driven generator unit in parallel. A seventh electric reactor and an eighth electric reactor are connected between an engine side converter and a grid side converter of a direct drive type wind driven generator unit in series, and a second filter capacitor is connected between the engine side converter and the grid side converter of the direct drive type wind driven generator unit in parallel. The operating reliability and stability of the grid connection wind driven generator units are improved with the small investment, the service life of the wind driven generator units is prolonged, and the problem that due to circuit resonance and electromagnetic wave irradiation, zero-sequence protection maloperation of a circuit protection device connected to the power grid is extremely prone to happening is well solved.

Description

technical field [0001] The invention relates to a technique for suppressing resonance of a grid-connected wind power generator set, in particular to a method for suppressing resonance of a grid-connected wind power generator set. Background technique [0002] At present, there are mainly two types of wind turbines, doubly-fed wind turbines and direct-drive wind turbines. In the access system of the doubly-fed wind turbine, the stator side is connected to the grid by AC, and the rotor side is connected to the grid through back-to-back dual PWM converters. Among them, the rotor-side IGBT converter adjusts the voltage and current of the rotor to compensate the change of the fan speed, realizes variable speed and constant frequency operation, and controls the output power factor, and the grid-side converter keeps the DC side voltage stable. The dual-PWM IGBT converter has the characteristics of low loss, high efficiency, can weaken low-order harmonics, and can operate at high p...

AI Technical Summary

Problems solved by technology

Since the IGBT converter must frequently adjust the rotor voltage and current to compensate for the change in the fan speed during operation, a large number of high-frequency components with varying frequencies will inevitably be generated, which will further aggravate the resonance, making the doubly-fed wind turbine connected to The resonance of grid connection is much more severe than that of direct drive wind turbines

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