Resonance boost DC/DC converter and control method thereof suitable for high-voltage and high-power occasions

Abstract

The invention discloses a resonance boost DC / DC converter and a control method thereof suitable for high-voltage and high-power occasions. The converter is connected with a direct-current input power source and a load and comprises two primary-side diodes, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a resonance unit, a first rectifier diode, a second rectifier diode and two filter capacitors. The resonance boost DC / DC converter is characterized in that the resonance unit is connected with a bridge arm composed of the four switching tubes and a rectifier unit composed of the two rectifier diodes and the two filter capacitors. According to the resonance boost DC / DC converter and the control method thereof, approximate zero voltage switching-off of the switching tubes and zero current switching-off of the rectifier diodes can be achieved, losses can be greatly reduced, and meanwhile the voltage stress of all switching devices is not larger than one second of the output voltage. A resonance circuit can be used for the high-power boost occasions.

Description

technical field [0001] The invention relates to the field of direct current converters and can be applied to high-power boosting occasions. Background technique [0002] Wind power generation is one of the fastest-growing forms of new energy utilization in the world today. Offshore wind power generation is widely valued by coastal countries around the world because it does not occupy land land and has abundant wind energy resources. With the continuous increase of the capacity of offshore wind farms and the increase of offshore distance, the use of high voltage direct current (High Voltage Direct Current, HVDC) power transmission has become an inevitable trend. HVDC power transmission has the advantages of not being affected by capacitive current, adjustable active and reactive power output, etc., but the traditional offshore wind farm system based on the medium-voltage AC busbar needs to use a huge and heavy power frequency step-up transformer, which is very difficult for t...

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Problems solved by technology

However, this type of resonant boost converter also has the following disadvantages: all switching devices need to have reverse voltage blocking capability; the voltage stress of the resonant capacitor, resonant inductor and all switching devices is approximately the output voltage; the resonant inductor is unidirectionally magnetized, The utilization rate of the magnetic core is not high, resulting in a larger volume and weight of the resonant inductor, and a corresponding increase in loss

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