| Valve will produce transient electromagnetic wave process when it cut off fleetness every time, then it will radiate high frequency Electromagnetic field. Supported by National Natural Science Foundation of China under grant NO.50777017, the time-varying topology antenna array and electromagnetic disturbance statistic methods of HVDC valve group are mainly researched in this paper. Firstly, the mechanism of electromagnetic disturbances which are produced by the 12-impulse valve is analyzed in theory. Then I used CST with simulation compute of HVDC valve group. Last I built the model of value tower, and got conclusion. Then compare the two groups'data and verify the model.
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