| With the development of high-capacity HVDC transmission system,the electromagnetic environment of the flexible DC converter station is not yet clear.And more and more attention is paid to the electromagnetic compatibility of the DC converter station.Therefore,the establishment of radiation model of DC converter station,the conduction model in the converter station are very significant for predicting the space electromagnetic environment in the converter station and the level of conducted electromagnetic disturbance in the converter station.According to the relevant research contents of National Key R&D Program Over-voltage Insulation Coordination with External Insulation and Electromagnetic Environment Technology"(Project No.2016YFB0900904),this paper focuses on the antenna radiation model and the electromagnetic conductivity harassment model of the flexible DC converter station.First,the physical topology and control characteristics of the flexible DC converter station are analyzed,and based on the equivalent principle of the radiant element of the commutation valve,radiation harassment source characteristics and the physical structure of radiation model,as the two key factors of the distribution of the radiation source in the space electromagnetic field,are deduced theoretically based on the moment method.And then based on this method,a ±320kV converter valve system radiation model is established in simulation software,after that,the characteristics of converter valve system in the near and far field are analyzed,and the randomness of the control characteristics is also considered to analyze the radiation of the converter valve.The correctness of the simulation method in this paper was verified in a prototype of a 25-level converter module built in a laboratory.Finally,based on the model of the main equipment,the flexible DC transmission model is built,and the electromagnetic disturbance level on both sides of the AC and DC is studied. |
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