向无源网络供电的LCC-MMC混合直流输电系统控制策略

发布时间：2019-02-28 14:18

【摘要】：电网换相换流器和模块化多电平换流器(LCC-MMC)混合直流输电系统兼顾了两种换流器的技术优势和经济优势,具有较好的应用前景。无源网络装设容性滤波装置能够起到平滑交流电压波形、提供电压支撑等作用。首先通过理论推导,建立了含容性滤波装置的模块化多电平换流器数学模型,基于dq理论,提出了模块化多电平换流器的无源解耦控制策略。针对送端电网换相换流器侧交流故障可能导致的功率中断等问题,从电网换相换流器和模块化多电平换流器的控制机理出发,分析了故障阶段及故障后的系统响应特性,并进而提出了送端交流故障穿越附加控制策略。为验证上述控制策略的有效性,在PSCAD/EMTDC内建立了一个LCC-MMC混合直流输电模型。通过受端电压频率变化和送端交流故障仿真,验证了所提控制策略的可行性和有效性。
[Abstract]:The hybrid DC transmission system of the power grid converter and the modular multi-level converter (LCC-MMC) takes the technical advantages and economic advantages of the two converters into consideration, and has a good application prospect. The passive network is provided with a capacitive filtering device to function as a smooth alternating current voltage waveform and a voltage support, and the like. Firstly, the mathematical model of the modular multilevel converter with the capacitive filter is established, and the passive decoupling control strategy of the modular multilevel converter is proposed based on the dq theory. Based on the control mechanism of the converter and the modular multilevel converter, the system response characteristics of the fault phase and the fault are analyzed. In addition, an additional control strategy is proposed for the end-to-end AC fault. To verify the effectiveness of the control strategy, an LCC-MMC hybrid DC transmission model was established in PSCAD/ EMTDC. The feasibility and effectiveness of the proposed control strategy are verified by the terminal voltage frequency variation and the end-to-end AC fault simulation.
【作者单位】：国网浙江省电力公司电力科学研究院;浙江大学电气工程学院;国网浙江省电力公司湖州供电公司;
【分类号】：TM721.1

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