| 引用本文: | 邓伟成,王鋆鑫,许建中,王一凡,刘瑞阔.抑制MMC电容电压波动的耦合谐波注入策略[J].电力自动化设备,2022,42(9): |
| DENG Weicheng,WANG Yunxin,XU Jianzhong,WANG Yifan,LIU Ruikuo.Coupling harmonic injection strategy for suppressing capacitor voltage fluctuation of MMC[J].Electric Power Automation Equipment,2022,42(9): |
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| 摘要: |
| 谐波注入策略是抑制模块化多电平换流器(MMC)子模块电容电压波动的有效手段。现有谐波注入策略常忽略二次谐波电压，这会导致理论模型产生误差进而影响电容电压波动抑制效果。为充分发挥谐波注入策略优势，提出了一种考虑二次谐波电压的耦合谐波注入策略。首先建立了二次谐波电流和三次谐波电压注入后的MMC桥臂功率波动模型，并且在模型中考虑了注入二次谐波电流后引起的二次谐波电压分量。根据调制比和桥臂电流应力限制，分别给出了三次谐波电压和二次谐波电流的约束。在此基础上，以抑制桥臂功率基频分量和二次谐波分量为目标，提出了耦合谐波参数的选取方法。最后通过PSCAD/EMTDC仿真验证了所提策略的有效性和通用性。结果表明：所提策略相较于已有文献所提策略能进一步抑制22.09 %的电容电压波动，适当增大桥臂电流可以更好地抑制电容电压波动。 |
| 关键词: 谐波注入策略 桥臂功率 电容电压波动 MMC |
| DOI：10.16081/j.epae.202205001 |
| 分类号:TM46 |
| 基金项目:中国长江三峡集团有限公司科研项目(202103052) |
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| Coupling harmonic injection strategy for suppressing capacitor voltage fluctuation of MMC |
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DENG Weicheng1, WANG Yunxin1, XU Jianzhong1, WANG Yifan2, LIU Ruikuo2
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.China Three Gorges Corporation, Beijing 100038, China
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| Abstract: |
| Harmonic injection strategy is an effective means to suppress the capacitor voltage fluctuation of MMC(Modular Multilevel Converter) sub-module. The existing harmonic injection strategies often ignore the second harmonic voltage, which will lead to errors in the theoretical model and affect the suppression effect of capacitor voltage fluctuation. In order to make full use of the advantages on harmonic injection strategy, a coupling harmonic injection strategy considering second harmonic voltage is proposed. The arm power fluctuation model of MMC after the injection of the second harmonic current and the third harmonic voltage is established, and the second harmonic voltage component caused by the injection of the second harmonic current is considered in the model. According to the limitation of modulation ratio and stress of arm current, the constraints of third harmonic voltage and second harmonic current are given respectively. On this basis, taking suppression of the fundamental and second harmonic components of arm power as the object, the selection method of coupling harmonic parameters is proposed. Finally, it is verified the effectiveness and versatility of the proposed strategy by PSCAD/EMTDC simulation. The results show that, compared with the strategy proposed in existing literature, the proposed strategy can further suppress the capacitor voltage fluctuation by 22.09 %,and increasing the arm current properly can restrain the capacitor voltage fluctuation better. |
| Key words: harmonic injection strategy arm power capacitor voltage fluctuation MMC |
