三相併聯型太陽光電能系統模型建立與模擬分析

Abstract

本文旨在研製三相併聯型太陽光電能系統，提出數學模型及控制策略。其中太陽電池陣列採取最大功率追蹤的擾動觀察法控制，而太陽能電力轉換器則包含了昇壓型直流/直流轉換器以及電壓源型三相換流器，前者採用定電流控制，後者採取電流控制。此控制策略使太陽電池陣列的輸出電能處在最大功率狀態、電壓源型三相換流器的輸入端直流電壓穩定在一定值，並輸出三相交流電流進入市電網路中。透過MATLAB/Simulink模擬軟體進行模型建立與模擬分析，驗證本文所設計的數學模型與控制策略適用於三相併聯型太陽光電能系統。

A mathematical model simulating control strategy for three-phase grid-connected photovoltaic systems is presented in this research. This research proposes the perturbation and observation method of maximum power point tracking control for a photovoltaic array. The photovoltaic power converter includes a boost converter and a three-phase voltage source inverter. The boost converter applies the method of constant current control, and the three-phase voltage source inverter utilizes the current control method. The control mechanism maximizes a photovoltaic array power output and stabilizes the DC-link voltage of a three-phase voltage source inverter, then exports three-phase current to a Utility Power Grid. The results of mathematical model developed by this research are examined and validated. Finally, the effectiveness of control strategy related to three-phase grid-connected photovoltaic system is demonstrated by using MATLAB/Simulink.