Method for controlling wind power integration inverter for realizing same frequency and same phase, and circuit thereof

Abstract

The invention provides a method for controlling a wind power integration inverter for realizing same frequency and same phase, and a circuit thereof. The method and the circuit settle the problems of asynchronous phase and asynchronous frequency in integration of a wind power generating system, and overcome the defects in digital and software phase locked loop technology of an existing wind power integration inverter. Furthermore the method and the circuit have advantages of simple structure, high flexibility, high response speed, high reliability, etc. The method and the circuit are widely used for the integration inverter of the wind power generating system. The method of the invention comprises the steps of acquiring a current signal and an electric grid voltage signal which are output from the wind power integration inverter, performing phase-shifting amplification on the voltage signal of the electric grid, multiplying the phase-shifted amplified voltage signal with the current signal which is output of the wind power integration inverter through a sinusoidal phase detector for generating a phase difference signal; multiplying the phase difference signal with a phase-shifted voltage signal of the electric grid through the sinusoidal phase detector for generating an amplitude adjusting signal; and overlapping the amplitude adjusting signal with the voltage signal of the electric grid for generating a vector control signal, wherein the vector control signal is used for controlling the current signal which is output from the wind power integration inverter for realizing same frequency and same phase with the voltage signal of the electric grid.

Description

technical field [0001] The invention relates to the technical field of wind power grid-connected power generation, in particular to a method and circuit for controlling a wind power grid-connected inverter with the same frequency and phase. Background technique [0002] The wind power grid-connected inverter rectifies the alternating current generated by the wind power alternator into direct current, and then through the high-frequency inverter device, inverts it into alternating current with the same frequency and phase as the grid, thereby realizing the grid connection of wind power generation . At present, most of the methods to realize the same frequency and the same phase use digital phase-locked loops, such as single-phase phase-locked loops for virtual average reactive power phase detection. Construct another phase quadrature signal under the two-phase stationary coordinate system ,Depend on , As an input signal, the two-phase stationary coordinate system is t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a method for controlling the same frequency and phase of wind power grid-connected inverters, which solves the problem of out-of-synchronization of phase and frequency when wind power generation systems are connected to the grid, and overcomes the problems of existing wind power grid-connected inverters. It has the advantages of simple circuit, fast response speed, good reliability, etc., and is widely applicable to grid-connected inverters of wind power generation systems. In addition, the invention also provides control wind power grid-connected inverters The circuit with the same frequency and the same phase as the inverter

Images