| 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. In this paper the built of valve antenna array and computation of its electromagnetic radiation are studied. Firstly, the mechanism of electromagnetic disturbances which are produced by the 12-impulse valve is analyzed in theory and the feasibility of computing its electromagnetic radiation is illustrated. Secondly, the model antenna of valve tower is built, and its radiation electric field is computed.The electric field graph of single-phase valve ranking from 50 kHz to 1MHz is got and verified by the scaled model. Thirdly, the three-phase valve tower radiation model is built by using the verified method mentioned above, and its field intensity produced around is obtained. At last the built of valve tower time-varying topology antenna array model is researched fatherly, and the computing result is demonstrated. |
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