| 引用本文: | 李兰芳,李奇南,王子莹.基于子模块电容电压平均值的构网型MMC同步控制及惯量支撑方法[J].电力自动化设备,2025,45(7):138-147 |
| LI Lanfang,LI Qinan,WANG Ziying.Synchronous control and inertia support method for grid-forming modular multilevel converter based on average voltage of submodule capacitor[J].Electric Power Automation Equipment,2025,45(7):138-147 |
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| 摘要: |
| 在构网型模块化多电平柔性直流输电系统中，既有的控制方法难以实现定直流电压换流站对交流系统的构网支撑能力。针对该问题，在分析子模块电容电压与直流电压解耦特性的基础上，基于子模块电容电压算数平均值，提出了改进的变流器同步控制和惯量支撑方法。通过在子模块电容电压控制环路引入超前校正环节，提出了基于比例微分调节器的电容电压外环控制策略及参数设计方法以兼顾调节时间与超调；提出了基于电容电压-频率附加下垂控制以提高变流器对交流系统的惯量支撑能力。PSCAD/EMTDC仿真结果表明，当受端系统相位、频率等发生变化时，所提方法可改善变流器对受端系统的惯量支撑能力及同步稳定性。 |
| 关键词: 模块化多电平变流器 柔性直流输电 子模块电容电压 同步方法 惯量支撑 构网型控制 解耦特性 |
| DOI：10.16081/j.epae.202501019 |
| 分类号:TM46;TM721.1 |
| 基金项目:南瑞集团资助项目(SGNRPG00YFJS2200406B) |
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| Synchronous control and inertia support method for grid-forming modular multilevel converter based on average voltage of submodule capacitor |
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LI Lanfang1,2, LI Qinan1,2, WANG Ziying1,2
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1.NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106, China;2.Beijing DC Transmission and Distribution Engineering Technology Research Center(China Power NARI PURUI Engineering Co.,Ltd.),Beijing 102200, China
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| Abstract: |
| In the grid forming(GFM) modular multilevel flexible high voltage direct current(HVDC) transmission system, the existing control methods are difficult to realize the GFM support ability of the constant DC voltage converter station to the connected AC system. Aiming for this issue, based on the analysis of the decoupling characteristics of the submodule capacitor voltage and DC voltage, an improved synchronous control and inertia support method of converter is proposed by means of the arithmetic average of the capacitor voltage of the submodule. By introducing a phase lead correction into the capacitor voltage control loop of the submodule, the capacitor voltage outer-loop control strategy and parameter design method based on proportional differential regulator are proposed to take into account the adjustment time and overshoot. An additional droop control based on capacitor voltage-frequency is proposed to improve the inertia support ability of the converter to the AC system. The simulative results of PSCAD/EMTDC show that the proposed method can improve the inertia support capability and synchronization stability of the converter to the receiving end AC system when the phase and frequency of the receiving end AC system change. |
| Key words: modular multilevel converter(MMC) flexible high voltage direct current transmission submodule capacitor voltage synchronous method inertia support grid forming control decoupling characteristics |
