Wind generator current-adjustment and phase-modulation control-based parallel DCM Boost PFC converter

Abstract

The invention provides a DCM Boost PFC converter. The DCM Boost PFC converter has the advantages that zero current of a switch tube is turned on, a diode is free of reverse recovery, the switching frequency is constant and the like. A constant duty ratio is controlled within a half input cycle, so that a relatively high power factor can be achieved. The wind generator current-adjustment and phase-modulation control-based parallel DCM Boost PFC converter mainly comprises two single-phase wind generators, parallel DCM Boost PFC converter bodies and an output filter capacitor. The duty ratio of the switch tube is continuously adjusted by detecting the fluctuation quantity of output voltage; and the magnitude of two-phase input current is changed, so that the electromagnetic torque of the generators is adjusted; and the rotating speed difference between the generators is changed to form different input phase differences. When the output voltage is staggered at a proper phase angle, input power fluctuation, output voltage fluctuation and the current flowing through a filter capacitor can be reduced to the minimum. When the output voltage fluctuation meets the requirements, an electrolytic capacitor can be replaced with a thin-film capacitor with relatively low capacity; the lifetime of the converter is prolonged; and the size is reduced.

Description

Technical field [0001] The invention is based on a Boost switching circuit, a PFC converter, a distributed direct-drive wind generator, a DSP controller, a number of resistors, capacitors, operational amplifiers and other circuit elements consisting of an interleaved parallel DCM Boost PFC based on current and phase modulation control Inverters belong to power electronic products. Background technique [0002] Distributed wind power generation is an important part of the DC microgrid system. The rapid development of wind power technology has made the development of small wind turbine systems towards multi-energy composite power generation systems, such as wind / storage or fuel cell systems, wind / photovoltaic / storage systems, etc. . In this micro-grid system composed of multiple energy sources, power electronic devices play a role as a bridge. The rapid development of power electronic technology and the use of a large number of power electronic equipment have not only brought hug...

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