Three-phase flyback voltage-multiplying single-switch rectifying circuit for small-scale wind power generation

Abstract

The invention discloses a three-phase flyback voltage-multiplying single-switch rectifying circuit for small-scale wind power generation. The circuit comprises a three-phase AC (Alternating Current) power supply, filtering capacitors C1, C2 and C3, a three-phase single-switch BOOST rectifying circuit, three flyback voltage-multiplying rectifying circuits, a signal acquisition circuit and a control circuit; the three-phase single-switch BOOST rectifying circuit comprises an uncontrollable rectifier bridge and a BOOST booster circuit; a three-phase single switch VT is controlled to be switched on and off by adopting a pulse frequency modulation (PFM) technology; an output voltage of the integral three-phase single-switch BOOST voltage-multiplying rectifying circuit is the sum of voltages on output capacitors Ca, Cb and Cc of a three-phase voltage-multiplying circuit and an output capacitor Co of a main circuit, so that the rectified output voltage is improved. Compared with the prior art, the rectifying circuit has the characteristics of high efficiency, high output voltage and the like compared with a conventional three-phase uncontrollable rectifying circuit and is very suitable for being used under the conditions with a lower wind speed and difficulty and high requirements on energy harvesting.

Description

technical field [0001] The invention relates to the technical field of small-scale wind generator conversion circuits, in particular to a novel rectifier circuit that can realize flyback voltage doubling, has higher efficiency, and can work normally when the output voltage of the wind turbine is low. Background technique [0002] Wind energy is a new type of energy. It has the advantages of being renewable, non-polluting, and low investment cost. It is a clean energy that can be fully researched and utilized under the current energy shortage situation. In many countries and regions, wind power has already accounted for a large proportion of the total power generation, which has brought great convenience and economic benefits. Therefore, the research on wind power technology is of great significance. However, the application of wind power generation is greatly affected by the geographical location. In some areas with poor wind and little wind, due to the low wind speed, the o...

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Problems solved by technology

However, due to the use of multiple power switch tubes in this circuit, the cost of the circuit is greatly increased. Considering the cost, it is not easy to popularize, and the rectifier circuit canno

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