ABSTRACT

This paper presents the design of a direct-type adaptive control structure for current regulation of a single-phase grid-tied Voltage-Source Inverter (VSI) with an LCL filter under very weak grid condition. The initial content of this work was previously published, where the controller was presented and its discrete-time stability proof was provided. Power converters connected to weak grids bring challenges to the control system, since the grid can change abruptly from a strong to a very weak condition , degrading system power quality. This study evaluates the feasibility of a RMRAC-based robust adaptive Super-Twisting Sliding Mode controller for current control of VSI when the grid inductance changes substantially, from 0 mH (strong grid) to 10 mH (very weak grid). To show the benefits of the control strategy and its robustness, hardware-in-the-loop (HIL) simulation results are presented, comparing its performance with two other controllers..

摘要

本文提出了一种直接型自适应控制结构的设计，用于在极弱电网条件下对带有 LCL 滤波器的单相并网电压源逆变器 (VSI) 进行电流调节。这项工作的初始内容之前已发表，其中介绍了控制器并提供了其离散时间稳定性证明。连接到弱电网的功率转换器给控制系统带来了挑战，因为电网可能突然从强状态变为非常弱状态，从而降低系统电能质量。本研究评估了当电网电感从 0 mH（强电网）到 10 mH（极弱电网）大幅变化时，基于 RMRAC 的鲁棒自适应超扭曲滑模控制器用于 VSI 电流控制的可行性。为了展示控制策略的优点及其鲁棒性，