直流输电网规划关键技术与展望
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摘要
新能源的大力发展促使传统能源供给和使用模式发生了根本性变化,大型煤炭、水力、光伏以及风能等多种能源并存发电的新局面,给传统的输电技术带来了巨大的挑战和深刻的变革。以常规直流(基于电网换相换流器(LCC))和柔性直流(基于电压源换流器(VSC))为基础的直流输电网为研究对象,对直流输电网规划的研究动态进行了综述。首先,分析直流输电网的特点与优势,提出并详细阐述直流输电网规划的总体框架;接着,分别从新能源广域并网、多馈入多落点地区直流组网、多电力电子设备协同优化三个方面,提出了直流输电网应用规划的关键技术;最后对张北±500kV柔性直流电网示范工程进行了简要的说明,并展望了未来直流输电网规划研究中需要关注的问题。
The vigorous development of new energy has made fundamental changes in the mode of supply and usage of traditional energy.Meanwhile,the new situation in the coexistence of power generation of large coal power,hydropower,photovoltaic and wind energy has brought great challenges and profound innovations to the traditional power transmission technology.The DC power grid based on traditional line commutated converter(LCC)and flexible voltage source converter(VSC)technology is investigated,and the research trends of DC power grid planning are reviewed.Firstly,the features and advantages of DC power grid are analyzed,and the framework of DC power grid planning is put forward and elaborated in detail.Then,the research ideas based on two application scenarios for DC grid planning are proposed,including the access of new energy to grid,multi-infeed and multi-terminal DC network.The multi-power electronic equipment co-optimization DC planning is also discussed.Finally,the preliminary planning of the demonstration project of the Zhangbei±500kV flexible DC power grid is briefly analyzed.And the key issues and prospects for researches of DC power grid planning in the future are provided.
The vigorous development of new energy has made fundamental changes in the mode of supply and usage of traditional energy.Meanwhile,the new situation in the coexistence of power generation of large coal power,hydropower,photovoltaic and wind energy has brought great challenges and profound innovations to the traditional power transmission technology.The DC power grid based on traditional line commutated converter(LCC)and flexible voltage source converter(VSC)technology is investigated,and the research trends of DC power grid planning are reviewed.Firstly,the features and advantages of DC power grid are analyzed,and the framework of DC power grid planning is put forward and elaborated in detail.Then,the research ideas based on two application scenarios for DC grid planning are proposed,including the access of new energy to grid,multi-infeed and multi-terminal DC network.The multi-power electronic equipment co-optimization DC planning is also discussed.Finally,the preliminary planning of the demonstration project of the Zhangbei±500kV flexible DC power grid is briefly analyzed.And the key issues and prospects for researches of DC power grid planning in the future are provided.
引文
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