Bidirectional three-level soft switch DC/DC for superconducting energy storage and its voltage side pulse width controlling method

A superconducting energy storage, three-level technology, used in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of shortening the life of the switch tube, high stress of the switch tube, and high price.

CN1845433AInactive Publication Date: 2006-10-11INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2006-10-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The dual-way tri-level soft switch DC / DC for superconductance energy-storage comprises a voltage unit composed by two tri-level semi-bridges with midpoint clamping diode, a transformer unit, and a current unit with structure decided by the last unit, total-bridge / total-wave current source inverter for common transformer / transformer with middle tap. Wherein, paralleling capacitors on top and bottom switch tubes of the semi-bridge, but not on two tubes on middle; or paralleling capacitors on all tubes; connecting midpoints of semi-bridge and clamping diode to midpoint of connecting line of two voltage-dividing capacitors. This invention can overcome the unbalance problem of midpoint voltage.
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Description

technical field

[0001] The invention relates to a DC converter for superconducting energy storage and a control method thereof, in particular to a bidirectional three-level soft switch DC / DC for superconducting energy storage and a control method thereof. Background technique

[0002] In recent years, with the development of superconducting material technology, the application of superconducting materials in the field of electric power has attracted more and more attention and attention, and countries all over the world have carried out research on superconducting electric power technology. Among them, superconducting energy storage technology has attracted people's attention because it can realize multiple functions such as pulse energy regulation and power system stability control, and has become the only commercialized superconducting power technology at present. Superconducting energy storage technology is generally divided into two types: voltage source type and current...

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Embodiment Construction

[0020] figure 2 It is a schematic diagram of a typical topology structure of the present invention. It consists of three parts: voltage unit, transformer unit and current unit. Its voltage unit consists of two three-level bridge arms. Switch tubes Q1-Q4 and clamping diodes D9 and D10 form one of the three-level bridge arms. The switch tubes Q1-Q4 are connected end to end, the switch tube Q1 is connected in antiparallel with the diode D1, and connected in parallel with the capacitor C1, and the switch tube Q4 is connected in antiparallel with the diode D4, and connected in parallel with the capacitor C4. The switch tube Q2 is connected in anti-parallel with the diode D2, and the switch tube Q3 is connected in anti-parallel with the diode D3. The midpoints of the switching tubes Q1 and Q2 are connected to the cathode of the clamping diode D9, and the midpoints of the switching tubes Q3 and Q4 are connected to the anode of the clamping diode D10. The anode of D9 is connected...