Grid-connected circuit for small-sized wind-driven generator

Abstract

The invention discloses a grid-connected circuit for a small-sized wind-driven generator. According to the grid-connected circuit for the small-sized wind-driven generator, an alternating current input side is connected with a three-phase output of the wind-driven generator through a three-phase single-switch BOOST rectification circuit, and the three-phase output of the wind-driven generator is connected with a three-phase capacitor; a rectification output side is directly connected with the three-phase single-switch BOOST rectification circuit, and the rectification circuit simultaneously has the functions of active power factor correction and maximum power tracking control; an inversion side is connected with a power grid by adopting a voltage type single-phase interleaved parallel inversion circuit; signal sampling circuits are divided into a voltage signal acquisition circuit and a current signal acquisition circuit, and the voltage signal acquisition circuit respectively acquires direct current voltage output by a rectification side, direct current voltage input by the inversion side and alternating current voltage of the power grid in real time; the current signal acquisition circuit respectively acquires direct current output by the rectification side and current output to the power grid by the inversion side in real time, namely grid-connected current signals; and a control circuit respectively controls switching tubes in the three-phase single-switch BOOST rectification circuit and the voltage type single-phase interleaved parallel inversion circuit.

Description

technical field [0001] The invention relates to the technical field of conversion circuits for small wind turbines, in particular to a grid-connected circuit for small wind power generators. Background technique [0002] Wind energy is a new type of renewable energy that can effectively relieve human energy pressure and environmental pressure. Therefore, research on wind power generation technology has received more and more attention, and small-scale wind power generation technology is one of the hot research directions. Small wind turbines refer to wind turbines with a generating power of 10kW or less. Due to the randomness of wind energy, the voltage and frequency of the electric energy generated by wind turbines are not fixed. In order to provide high-quality and usable electric energy, a power conversion circuit must be used between the small wind turbine and the grid or load. The small fan conversion circuit is mainly composed of rectification and inverter. The tradit...

AI Technical Summary

Problems solved by technology

After being rectified by the PWM rectifier circuit, an ideal rectified wave can be obtained, but at the same time, the cost of the circuit is too high, the actual benefit is not proportional to the cost, and the control is complicated, and the system reliability is reduced

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