This paper focuses on the control development of a grid-tied photovoltaic system coupled with a shunt active power filter. The considered power system includes a PV panel, a single-capacitor three half-bridge interleaved buck converter connected to a three-phase power grid and a nonlinear load. This study aims to accomplish simultaneously three objectives: i) to ensure a high compensation level of current harmonics and reactive power consumed by the nonlinear load in order to perform power factor correction at the grid side; ii) to extract the maximum power from the PV panel regardless the climatic conditions; iii) to regulate the dc bus capacitor voltage to its reference provided by the MPPT controller. To this end, a controller using a two-loop cascade strategy is designed. First, the inner loop is developed with the hybrid automaton approach to formulate the switching control signals with the aim of guaranteeing a unitary power factor. Second, the outer loop is designed using fuzzy logic control to ensure the regulation of the photovoltaic voltage, while the perturb and observe algorithm is employed to perform maximum power point tracking. Finally, the system with the developed control scheme is simulated using MATLAB/SimPowerSystems environment. The obtained results confirm that the proposed controller is able to achieve the previous objectives under varying environmental conditions.

中文翻译：

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具有三相半桥交错降压并联有源电力滤波器的并网光伏系统的级联控制器：混合控制策略和模糊逻辑方法

本文重点介绍了与并联有源电力滤波器耦合的并网光伏系统的控制开发。所考虑的电力系统包括一个光伏电池板、一个连接到三相电网的单电容器三半桥交错降压转换器和一个非线性负载。本研究旨在同时实现三个目标：i）确保非线性负载消耗的电流谐波和无功功率的高补偿水平，以便在电网侧进行功率因数校正；ii) 无论气候条件如何，都能从光伏面板中提取最大功率；iii) 将直流母线电容器电压调节到其由 MPPT 控制器提供的参考值。为此，设计了一种采用双回路级联策略的控制器。第一的，内环采用混合自动机方法开发，以制定开关控制信号，以保证单一的功率因数。其次，外环采用模糊逻辑控制设计，保证光伏电压的调节，同时采用扰动观察算法进行最大功率点跟踪。最后，利用MATLAB/SimPowerSystems环境对具有开发控制方案的系统进行仿真。获得的结果证实，所提出的控制器能够在不同的环境条件下实现先前的目标。采用扰动观察算法进行最大功率点跟踪。最后，利用MATLAB/SimPowerSystems环境对具有开发控制方案的系统进行仿真。获得的结果证实，所提出的控制器能够在不同的环境条件下实现先前的目标。采用扰动观察算法进行最大功率点跟踪。最后，利用MATLAB/SimPowerSystems环境对具有开发控制方案的系统进行仿真。获得的结果证实，所提出的控制器能够在不同的环境条件下实现先前的目标。