三电平并联型APF死区效应分析及其对策研究
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。...
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| Published in | 电力系统保护与控制 Vol. 44; no. 13; pp. 20 - 26 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
太原理工大学电气与动力工程学院,山西 太原,030024%中煤建筑安装工程集团有限公司,河北邯郸,056000
2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-3415 |
| DOI | 10.7667/PSPC151354 |
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| Summary: | 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。 |
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| Bibliography: | WU Min, MENG Runquan, ZHAO Gang （1. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. China Coal Building ＆ Installation Engineering Co., Ltd., Handan 056000, China） tri-level shunt APF; dead-time effect; current interval judgment; PWM signal correction; harmonic compensation performance 41-1401/TM 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 cart be averted in the case of other factors unchanged. In this way the bad influence caused by the dead-time effect on the performance |
| ISSN: | 1674-3415 |
| DOI: | 10.7667/PSPC151354 |