Robust Active Damping Methods for LCL Filter-Based Grid-Connected Converters
Robust Active Damping Methods for LCL Filter-Based Grid-Connected Converters
复制标题
DOI：
10.1109/tpel.2016.2626290
复制
发表时间：
2017-09
影响因子：
6.7
通讯作者：
Marwa Ben Saïd-Romdhane;M. Naouar;I. Slama-Belkhodja;E. Monmasson
中科院分区：
文献类型：
--
作者：
Marwa Ben Saïd-Romdhane;M. Naouar;I. Slama-Belkhodja;E. Monmasson
为了适应新的电网规范及其在不久的将来的变化，并网变流器采用LCL滤波器代替简单的L滤波器。对于基于LCL滤波器的GcCs（LCL-GcCs）的谐振问题，无功率损耗的有源阻尼方法优于无源阻尼方法。然而，电网电感的大幅变化（通常在弱电网条件下和农村地区）可能会危及系统稳定性。此外，数字控制器的延迟会改变系统的相频特性，从而影响系统的稳定性。鉴于此，本文提出了一个系统的设计程序，为LCL-GCC的电压定向PI控制的主动阻尼。该程序考虑了基于电容电流反馈的有源阻尼方法，旨在确保在电网电感剧烈变化的情况下稳定运行，同时考虑了数字控制延迟和LCL滤波器参数变化对系统稳定性的影响。仿真和实验结果进行了讨论，以验证所提出的设计过程。
Grid-connected converters (GcCs) employ LCL filters instead of simple L filters in order to meet new grid codes and their on-going changes in the near future. Active damping methods, without power losses, are preferred to passive ones for solving the resonance problems of LCL-filter-based GcCs ( LCL-GcCs). However, large changes in the grid inductance (typically under weak grid conditions and in rural areas) may compromise the system stability. Moreover, the delay of digital controllers will change system phase-frequency characteristics and consequently will affect the system stability. In view of this, this paper proposes a systematic design procedure for the active damping of voltage-oriented PI control for LCL- GcCs. The procedure considers active damping methods based on capacitor current feedback and is aimed to ensure stable operation under severe grid inductance variations while taking into account the influence of digital control delay and LCL filter parameters changes on the system stability. Simulation and experimental results are presented and discussed in order to validate the proposed design procedure.