【作者】 王超；

【导师】 文俊；

【作者基本信息】 华北电力大学（北京） ， 电力电子与电力传动， 2011， 硕士

【摘要】 随着极端天气的增加,输电线路覆冰已严重威胁电网的安全运行。目前电力系统融冰方法较多,应用最广泛的是利用三相短路产生大电流融冰。鉴于直流电流融冰的优越性,目前已经越来越受到人们关注。本文将分别针对高压交流输电线路和直流输电线路,研究其直流融冰方法。对于高压交流输电线路,本文详细分析了高压交流输电线路融冰原理,并给出了直流融冰方案设计,最后根据设计参数在PSCAD/EMTDC环境下进行了仿真,验证该方案确实可行。同时对于直流输电线路,提出了背靠背融冰方式和双极并联融冰方式,并详细分析了各种运行方式下控制策略,同时参照直流输电标准模型,在PSCAD/EMTDC环境下进行了分别建立了背靠背融冰方式和双极并联融冰方式的模型,通过仿真,得出各种方式的稳态参数和暂态参数,结果表明该方案能够很好的进行融冰,同时明确了无论何种融冰方式并不需要增加换流站的无功补偿及滤波装置。更多还原

【Abstract】 With the increase in extreme weather, transmission line has been a serious threat to the safe operation of power grid. Now there are several methods of ice melting in power system, the most widely method is melting ice by using three-phase short-circuit-current. In view of the superiority of direct current melting ice, it has been more and more attractive. For high voltage AC transmission line and DC transmission lines, this paper will discuss the DC melting ice method respectively. For high voltage AC transmission line, the paper analyzes its principle of melting ice, presents design of DC-melting ice, and according to the design parameters simulate the design under the environment of PSCAD/EMTDC to verify its feasibility. For DC transmission lines, this paper presents back to back ice-melting method and parallel mode bipolar ice-melting method. Refer to the standard model of HVDC, this paper analyzes various operating mode control strategy and simulates back to back ice-melting method and parallel mode bipolar ice-melting method under the environment of PSCAD/EMTDC to get steady state and transient parameters under different operating modes. The results show that this design is effective in ice-melting.Also we can get the conclusion that for each ice-melting method, it is not necessary to increase the reactive power compensation and filtering devices in the converter station.更多还原