Power electronic transformer

Abstract

The invention relates to a power electronic transformer. The power electronic transformer comprises an alternating current power supply, wherein the alternating current power supply is sequentially connected with a primary side alternating current-alternating current conversion circuit, a high-frequency transformer and a secondary side alternating current-alternating current conversion circuit, wherein an output end of the secondary side alternating current-alternating current conversion circuit is connected with a voltage mutual inductor by a filter inductor; the output end of the voltage mutual inductor is connected with an effective value calculating circuit; the effective value calculating circuit is connected with given input voltage in parallel and then is connected with a voltage adjuster in series; the voltage adjuster is connected with a driving circuit by a phase shift calculating circuit; and the driving circuit is respectively connected with the primary side alternating current-alternating current conversion circuit and the secondary side alternating current-alternating current conversion circuit. The power electronic transformer has the beneficial effects that a middle energy storage link is not needed and current can flow in two directions so as to provide possibility to energy feedback; and under a high-frequency environment, the waveform of output voltage is better and a miniaturized and light-weight trend design of a traditional power transformer can be realized.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an AC-AC conversion power electronic transformer. Background technique [0002] The transformer is the main equipment of the power system. The traditional transformer is widely used because of its simple structure and safe and reliable operation. However, the existing transformers have obvious defects, such as large no-load loss, low energy conversion efficiency and poor reliability under power frequency conditions. . [0003] Because of the above defects of traditional transformers, power electronic transformers with high frequency, high power density, high reliability, low noise and fast response have been developed rapidly, such as [3] MOONSHILK KANG, PRASADN ENJETI, LRA J PITEL. Analysis and design of Electronic Transformers for Electric Power Distribution System[J]. IEEE Transactions on Power Electronics, 1999(14):1133-1141. And Dong Dezhi, Xie Dawei, Hong Naigang. ...

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Problems solved by technology

And Dong Dezhi, Xie Dawei, Hong Naigang. Power electronic transformer based on double PWM conversion [J]. Journal of Anhui University of Technology, 2006, 23 (2): 169-173 gave a new type of power electronic transformer, and pointed out that these power electronic transformers have guaranteed input current waveform as The advantages of controllable sine wave and power factor, but the above-mentioned power electronic transformers have the defects and deficiencies of too many conversion links and large losses

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