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首页> 外文期刊>Industry Applications, IEEE Transactions on >Investigation of Active Damping Approaches for PI-Based Current Control of Grid-Connected Pulse Width Modulation Converters With LCL Filters
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Investigation of Active Damping Approaches for PI-Based Current Control of Grid-Connected Pulse Width Modulation Converters With LCL Filters

机译：基于PI的具有LCL滤波器的并网脉宽调制转换器基于PI的电流控制的有源阻尼方法研究

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摘要

This paper deals with various active damping approaches for PI-based current control of grid-connected pulsewidth-modulation (PWM) converters with LCL filters, which are based on one additional feedback. Filter capacitor current, as well as voltage feedback for the purpose of resonance damping, are analyzed and compared. Basic studies in the continuous Laplace domain show that either proportional current feedback or derivative voltage feedback yields resonance damping. Detailed investigations of these two approaches in the discrete $z$-domain, taking into account the discrete nature of control implementation, sampling, and PWM, are carried out. Several ratios of LCL resonance frequency and control frequency are considered. At high resonance frequencies, only current feedback stabilizes the system. At medium resonance frequencies, both approaches have good performance. At low resonance frequencies, stability gets worse, even though voltage feedback offers slightly better damping properties. Measurements validate the theoretical results.
机译：本文讨论了基于LPI滤波器的，基于PI的并网脉宽调制（PWM）转换器基于PI的电流控制的各种有源阻尼方法，这些方法基于一种额外的反馈。分析和比较了滤波电容器电流以及用于谐振阻尼的电压反馈。在连续拉普拉斯域中的基础研究表明，比例电流反馈或微分电压反馈都会产生共振阻尼。考虑到控制实现，采样和PWM的离散性，对这两种方法在离散$ z $域中进行了详细的研究。考虑了LCL谐振频率和控制频率的几个比率。在高谐振频率下，只有电流反馈才能使系统稳定。在中等共振频率下，两种方法都具有良好的性能。在低谐振频率下，即使电压反馈提供了更好的阻尼特性，稳定性也会变差。测量结果验证了理论结果。

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