海上风电经DRU串联MMC拓扑混合直流送出系统的启停策略OA
Start-Stop Strategy of Hybrid DC Transmission System with Series Topology of DRU and MMC for Offshore Wind Power
二极管整流单元(DRU)与模块化多电平换流器(MMC)串联拓扑的混合直流输电系统因其具有较大的经济优势,在新能源基地外送系统中具有较好的应用前景.文中首先介绍了适用于海上风电送出系统的混合直流拓扑结构以及送、受端的控制策略;为了解决稳态运行时海上风电、DRU与MMC存在的功率不平衡问题,提出了两种子模块平均电压控制策略.然后,提出了送、受端换流器与海上风电系统的协同启停流程,分析了启停过程中海上风电功率与DRU交直流侧开关状态切换时间对送端子模块电容压升的影响.最后,搭建了二极管混合直流的PSCAD/EMTDC仿真模型,验证了所提稳态运行及启停策略的有效性.
The hybrid DC transmission system with a series topology of diode rectifier unit(DRU)and modular multilevel converter(MMC)has great economic advantages and has good application prospects in the transmission system of renewable energy bases.First,this paper introduces a hybrid DC topology suitable for offshore wind power transmission systems and control strategies for the sending and receiving ends.In order to solve the power imbalance problem of offshore wind power,DRU and MMC during steady-state operation,two submodule average voltage control strategies are proposed.Then,a collaborative start-stop process between the sending-and receiving-end converters and the offshore wind power system is proposed.The influence of offshore wind power and switching time of DRU AC/DC switch state on the capacitor voltage rise of the sending-end module is analyzed during the start-stop process.Finally,a PSCAD/EMTDC simulation model of diode hybrid DC is constructed to verify the effectiveness of the proposed steady-state operation and start-stop strategy.
陆海洋;李光辉;王伟胜;刘杰;肖云涛
可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京市 100192可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京市 100192可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京市 100192国家电网有限公司,北京市 100031可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京市 100192
海上风电二极管整流单元直流输电系统稳态运行启停
offshore wind powerdiode rectifier unitDC transmission systemsteady-state operationstart-stop
《电力系统自动化》 2026 (11)
52-60,9
国家电网有限公司总部科技项目(5100-202455311A-1-3-ZB). This work is supported by State Grid Corporation of China(No.5100-202455311A-1-3-ZB).
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