以終端滑模控制為基礎之市電併聯型太陽能系統最大功率發電

Maximum Power Generation of a Grid-Tied Photovoltaic System via Terminal Sliding-Mode Control

邱謙松(Chian-Song Chiu) ； 林羿德(Yi-Te Lin) ； 謝冠群(Guan-Chyun Hsieh)

《先進工程學刊》 8卷4期 (2013/10) Pp. 181-190

摘要

本文以終端滑模控制提出市電併聯型太陽能發電系統之最大功率點追蹤控制法來達成最大功率效能。市電併聯型太陽能發電系統係將太陽能板所擷取的電力先經變流器作直／交流轉換，再藉由市電併聯電路饋入台電電網供負載使用。在此我們採用單級變流器設計架構來組成單相市電併聯電路，此架構組成元件較少且易於實現。為了達到太陽能系統市電併聯發電的目的，提出了終端滑模電流控制器來進行市電併聯變流器電流追蹤，其可以保證變流器輸出電流能在有限收斂時間內追蹤至與市電電壓同步的參考電流命令，並且對於元件參數不確定性與外在干擾具有高度強健性。同時為了達到最大功率點追蹤目標，結合終端滑模電流控制器與最大功率點搜尋演算法，可以有效找出太陽能系統最大功率點輸出參考電流，使得太陽能發電系統快速達到最大功率點，而整體所發展的最大功率點追蹤控制器具有易於實現與高性能的優點。最後透過數值模擬與實作亦驗證其控制性能。

關鍵字

太陽能發電系統 ； 最大功率點追蹤 ； 終端滑模控制

並列摘要

This paper presents the maximum power point tracking (MPPT) of a grid-tied photovoltaic generation system to achieve the maximum power efficiency via the terminal sliding-mode control. The grid-tied photovoltaic generation system transforms the captured solar power to the utility grid through a single-stage single-phase DC/AC inverter which has less circuit complexity and components. To achieve the grid-tied objective, the terminal sliding-mode current controller is proposed for the output current tracking of the grid-tied inverter. It is assured that the inverter output current tracks the reference current synchronizing with the grid voltage in finite time. Moreover, the control system holds high robustness to circuit uncertainty and external disturbance. For MPPT control, the terminal sliding-mode current controller is combined with a maximum power point searching algorithm to effectively find the reference current of the maximum power point and quickly achieve MPPT feature. As a result, the overall MPPT controller provides high performance in an easily implemented measure. Finally, through the numerical simulations, the expected controlling performance is shown and verified in the experiments.

並列關鍵字

photovoltaic generation system ； maximum power point tracking ； terminal sliding-mode control