Voltage-equalizing and power-equalizing control method for multi-module cascade solid-state transformer
A technology of solid-state transformers and control methods, applied in control/regulation systems, output power conversion devices, reactive power adjustment/elimination/compensation, etc., can solve problems such as voltage and power imbalance, and achieve low voltage stress on switching tubes , the control algorithm is simple, and the effect of high grid current sine degree
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[0023] The SST power main circuit part of the multi-module cascaded solid-state transformer equalizing power control method of the present invention is composed of three stages: the input stage is a high-frequency active AC / DC rectifier, and the intermediate stage is a high-frequency isolated DC / DC converter , the output stage is a high-frequency DC / AC inverter. In order to meet the requirements of high voltage and high power level, the AC side of the input stage adopts multi-module series connection, the high-voltage DC output terminal of each module of the input stage is connected to the input terminal of each module of the intermediate stage, and the output terminals of each module of the intermediate stage are connected in parallel to output 400V DC. The output stage high-frequency inverter transforms 400V DC into output 220V / 50Hz AC. Power can flow in both directions.
[0024] The multi-module cascaded solid-state transformer voltage equalization and power equalization c...
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