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首页> 外文期刊>Energies >Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters
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Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters

机译：基于电容电流反馈的数字控制的电感-电容-电感-滤波的并网逆变器有源谐振阻尼策略

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摘要

Inductive-capacitive-inductive (LCL)-type line filters are widely used in grid-connected voltage source inverters (VSIs), since they can provide substantially improved attenuation of switching harmonics in currents injected into the grid with lower cost, weight and power losses than their L-type counterparts. However, the inclusion of third order LCL network complicates the current control design regarding the system stability issues because of an inherent resonance peak which appears in the open-loop transfer function of the inverter control system near the control stability boundary. To avoid passive (resistive) resonance damping solutions, due to their additional power losses, active damping (AD) techniques are often applied with proper control algorithms in order to damp the LCL filter resonance and stabilize the system. Among these techniques, the capacitor current feedback (CCF) AD has attracted considerable attention due to its effective damping performance and simple implementation. This paper thus presents a state-of-the-art review of resonance and stability characteristics of CCF-based AD approaches for a digitally-controlled LCL filter-based grid-connected inverter taking into account the effect of computation and pulse width modulation (PWM) delays along with a detailed analysis on proper design and implementation.
机译：电感电容电感（LCL）型线路滤波器广泛用于并网电压源逆变器（VSI），因为它们可以显着改善注入电网的电流中开关谐波的衰减，从而降低成本，减轻重量并降低功率损耗比他们的L型对手但是，由于在逆变器控制系统的开环传递函数中会在控制稳定性边界附近出现固有的共振峰，因此包含三阶LCL网络会使当前的系统设计变得更加复杂。为了避免无源（电阻）共振阻尼解决方案，由于其额外的功率损耗，有源阻尼（AD）技术通常与适当的控制算法一起使用，以衰减LCL滤波器的共振并稳定系统。在这些技术中，电容器电流反馈（CCF）AD由于其有效的阻尼性能和简单的实现方式而引起了人们的广泛关注。因此，本文考虑了计算和脉冲宽度调制（PWM）的影响，为基于数字控制LCL滤波器的并网逆变器的基于CCF的AD方法的谐振和稳定性特性提供了最新的技术综述）的延迟以及对正确设计和实施的详细分析。

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