| The dissertation is mainly dealt with three phase power factor problem in the power supply system of underwater weapons with the emphasis on the system to wide input range and fast response to change. Use new theory and new method of electronic power design converter of high PFC, high efficiency, high energy density, good adaptability, quick dynamic response and good EMC. The study is important to improve power supply system performance of underwater weapon. In the article, two-stage PFC is used to satisfy the require index. The first stage is three-phase Voltage Source Rectifier, to realize high PFC rectification. SVPWM are used to reduce on-off frequencies and can decrease switching loss. The second stage is DC/DC rectifier, to make the out voltage stable and have a good dynamic response of the system. The design and character of the system is detailed introduce in the article. The principle and mathematic model of three phase voltage source rectifier is analyzed. The principle, computation and combination of voltage space vector modulation are investigated.A new control method——ameliorated double voltage hoop control method is used in DC/DCrectifier, establish its small-signal mode, find its open loop transfer function. The frequency character curve show ameliorated V~2 control method has a high gain, and can keep very wide phase abundance. Additionally, hardware and software are introduced, and part of the circuit are given in the article. |
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