| 引用本文: | 王 琦,袁 越,王恩荣,吴华仁,李天然.一种提高三相VSR直流母线电压控制能力的方法[J].电力自动化设备,2012,32(9): |
| WANG Qi,YUAN Yue,WANG Enrong,WU Huaren,LI Tianran.Enhancement of DC voltage control for three-phase VSR[J].Electric Power Automation Equipment,2012,32(9): |
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| 摘要: |
| 在三相VSR系统中，当直流母线电压跌落较大时会导致交流侧电压饱和，从而引起交流侧电流畸变和系统的动态响应变差。针对该问题，通过分析三相VSR直流侧电压对交流侧电流的影响以及交流侧矢量关系，提出从电网吸收或向其注入一定无功功率的方法。同时给出了给定无功电流的选取方法。实验结果表明，当直流母线电压跌落并导致变换器交流侧电压饱和时，所提方法可使交流侧电压降低到线性调制区域，降低了交流侧电流的畸变率，改善了系统的动态响应。 |
| 关键词: 三相VSR 无功电流 饱和 线性调制 ＳＶＰＷＭ 电压控制 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（51177074） |
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| Enhancement of DC voltage control for three-phase VSR |
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WANG Qi1,2, YUAN Yue1, WANG Enrong2, WU Huaren2, LI Tianran2
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1.College of Energy and Electrical Engineering，Hohai University，Nanjing 210098，China;2.School of Electrical & Automation Engineering，Nanjing Normal University，Nanjing 210042，China
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| Abstract: |
| In three-phase VSR system，the decline of DC-bus voltage may lead to the saturation of AC-side voltage，resulting in AC-side current distortion and system dynamic response degradation，for which，a method to absorb or inject the reactive power from or into the power grid is proposed. The AC-side vector relationship of three-phase VSR and the influence of its DC-bus voltage on AC-side current are analyzed and the method to select the reference reactive current is given. Experimental results show that，when DC-bus voltage declines and AC-side voltage is saturated，the AC-side voltage is decreased into the linear modulation region by the proposed method，which reduces the distortion of AC-side current and improves the dynamic response of system. |
| Key words: three-phase VSR reactive current saturation linear modulation SVPWM voltage control |
