| 引用本文: | 武敏,孟润泉,赵 刚.三电平并联型APF死区效应分析及其对策研究[J].电力系统保护与控制,2016,44(13):20-26.[点击复制] |
| WU Min,MENG Runquan,ZHAO Gang.Tri-level shunt APF dead-time effect analysis and its countermeasure research[J].Power System Protection and Control,2016,44(13):20-26[点击复制] |
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| 摘要: |
| 为了解决三电平并联型有源电力滤波器(APF)死区效应问题，通过分析APF死区效应的产生机理和影响因素，同时结合在实际运行中电流流向突变时存在的一些问题，提出一种基于电流区间判断的PWM信号修正方案。该方案在其他因素不变的前提下可以降低对检测和采样环节精度的依赖，避免电流过零处抖动而导致极性误判进而引发桥臂直通，从而减小死区效应对APF谐波补偿性能的不良影响。利用Matlab对所提方案进行了仿真研究。研究结果表明，该方法不仅消除了绝大多数死区，同时排除了冗余的开关切换，谐波补偿效果优于常规控制。 |
| 关键词: 三电平并联型APF 死区效应 电流区间判断 PWM信号修正 谐波补偿性能 |
| DOI：10.7667/PSPC151354 |
| 投稿时间：2015-08-03修订日期：2015-09-25 |
| 基金项目:山西省煤基重点科技攻关项目(MD2014-06);太原理工大学校基金(团队)项目(2014TD022) |
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| Tri-level shunt APF dead-time effect analysis and its countermeasure research |
| WU Min,MENG Runquan,ZHAO Gang |
(College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
;China Coal Building & Installation Engineering Co., Ltd., Handan 056000, China) |
| Abstract: |
| In order to reduce the dead-time effect of tri-level shunt active power filter (APF), through the analysis of the production principle and influence factors of dead-time effect in APF, and combining with current flow to the mutations in the actual operation problems, a kind of PWM signal correction scheme based on the current interval judgment is designed. The scheme avoids detecting the current direction directly by setting the current buffers around zero current, by which the interference from current jitter around zero-crossing can be averted in the case of other factors unchanged. In this way the bad influence caused by the dead-time effect on the performance of APF harmonic compensation can be reduced. Last, the proposed schemes are verified by the Matlab simulation, and the results show that not only the vast majority of dead-time is eliminated, but also the redundant switches are removed, thus the harmonic compensation effect is superior to that of the conventional control. |
| Key words: tri-level shunt APF dead-time effect current interval judgment PWM signal correction harmonic compensation performance |
