MMC Dual-port Grid-forming Control for Efficient and Stable Interconnection of HVDC and HVAC
薛国清 1贵献国 2李雄3
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作者信息
1. 山西工程科技职业大学设备工程学院,晋中 030619
2. 哈尔滨工业大学电气工程及自动化学院,哈尔滨 150006
3. 国网上海市电力公司,上海 200437
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摘要
针对不同类型电网互联时互联电力变换器IPC(interconnecting power converter)控制模式复杂、控制难度大等问题,提出一种用于互联多个高压直流和高压交流子电网的IPC新型电网形成GFM(grid-forming)控制方法.该方法利用模块化多电平变换器MMC(modular multilevel converter)同时控制其AC和DC端电压,并提出2个双端口GFM MMC控制策略.针对单端口GFM控制和所提双端口GFM控制进行仿真对比,结果表明,与单端口GFM控制相比,双端口GFM控制方法对突发事件(如线路和发电机停运等)的处理更具弹性,且不需为电网中的IPC端口选择GFM或电网跟随GFL(grid-following)的控制方式.
Abstract
Aimed at the problem that the control modes of interconnecting power converters(IPCs) are complicated to assign and difficult to control when different types of power grids are connected, a novel grid-forming(GFM) control method for IPCs that interconnect high voltage direct current(HVDC) and high voltage alternating current(HVAC) sub-grids is proposed. This method uses modular multilevel converters(MMCs) to control AC and DC terminals simultaneously. In addition, two dual-port GFM MMC control strategies are put forward. Finally, a simulation comparison between single-port GFM control and the proposed two-port GFM control is performed. Results show that compared with the single-port GFM control, the two-port GFM control method is more flexible to emergencies(i.e., line and generator outage), and there is no need to choose the control mode of GFM or grid-following(GFL) for IPC ports in the power grid.
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