多逆变器并网运行耦合谐振分析及抑制策略
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引用本文:张春强,陈智勇 ,李鸣慎 ,匡慧敏 ,程石.多逆变器并网运行耦合谐振分析及抑制策略[J].计算技术与自动化,2016,(2):12-19
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张春强,陈智勇 ,李鸣慎 ,匡慧敏 ,程石 (1.江西省电力科学研究院,江西 南昌330006
2.湖南大学 电气与信息工程学院,湖南 长沙410082) 
中文摘要:多逆变器并网运行的谐振问题与单台逆变器相比较为复杂。本文建立的多逆变器并网运行的诺顿等效数学模型,按谐振产生机理的差异将谐振划分为:自身谐振、并联谐振、串联谐振,并分析了各类谐振的特点;电流控制环节引入谐波电流补偿的有源阻尼环节,以衰减耦合谐振峰值。通过与未采用谐波电流补偿的控制策略的对比研究,验证该方案抑制谐振的有效性。
中文关键词:多逆变器并联  耦合谐振  虚拟谐波电阻  微电网
 
Coupling Resonance Analysis of Multi-parallel Grid-connected Inverters and its Damping Strategy
Abstract:The resonance problem in multi-paralleled inverters with LCL filter operating on grid-connected mode in microgrid is more complex than single one. In this paper, the mathematic model of multi-parallel inverters was figured out based on Norton's equivalent circuit. And in terms of different causes of resonance, the resonance problems associated with multi-paralleled inverters operating in grid-connected mode were categorized into three types: individual resonance, parallel resonance, series resonance. In order to attenuate resonance peak, a compensation term of harmonic current was engaged into current control loop. The comparative study was conducted to verify the effectiveness of resonance attenuation method.
keywords:Multi-paralleled inverters  coupling resonance  virtual harmonic resistor  microgrid
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