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Capacitor-Voltage Feedforward With Full Delay Compensation to Improve Weak Grids Adaptability of LCL-Filtered Grid-Connected Converters for Distributed Generation Systems

机译:具有全时延补偿的电容器电压前馈可改善分布式发电系统中经LCL滤波的并网转换器的弱电网适应性

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摘要

LCL-filtered grid-connected converters are widely used for distributed generation systems. However, the current regulation of such converters is susceptible to weak grid conditions, e.g., grid impedance variation and background harmonics. Paralleling multiple harmonic compensators (HCs) is a commonly used method to suppress the current distortion caused by grid background harmonics, but the control bandwidth should be wide enough to ensure system stability. In order to enhance the adaptability of LCL-filtered grid-connected converters under weak grid operation, this paper proposes an improved capacitor-voltage-feedforward control with full delay compensation. When used with converter-side current feedback, the proposed control can keep system low-frequency characteristic independent of grid impedance and provide a high-harmonic rejection capability without using additional HCs. Moreover, it completely avoids the design constraints of an LCL filter, i.e., is required for single-loop converter-side current control. Therefore, a higher resonant frequency can be designed to achieve a wider control bandwidth and to lower the current distortion caused by the paralleled filter capacitor branch. Experimental results are finally presented to verify the proposed control, which are also in good agreement with theoretical analysis.
机译:LCL滤波的并网转换器广泛用于分布式发电系统。但是,这种转换器的电流调节容易受到弱电网条件的影响,例如电网阻抗变化和背景谐波。并联多重谐波补偿器(HCs)是抑制电网背景谐波引起的电流失真的常用方法,但是控制带宽应足够宽以确保系统稳定性。为了增强在弱电网运行下经过LCL滤波的并网转换器的适应性,本文提出了一种具有全时延补偿的改进的电容器电压前馈控制。当与转换器侧电流反馈一起使用时,所提出的控制可以保持系统的低频特性与电网阻抗无关,并提供高谐波抑制能力,而无需使用额外的HC。而且,它完全避免了LCL滤波器的设计约束,即单回路转换器侧电流控制所需的约束。因此,可以设计更高的谐振频率,以实现更宽的控制带宽并降低由并联滤波电容器分支引起的电流失真。最后给出了实验结果,以验证所提出的控制,这也与理论分析相吻合。

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