太陽能發電整流變流器與市電併聯系統之研製

Design and Implementation of the Rectifier and Inverter for Grid-interconnect Solar PV System

周俊男(Chun-Nan Chou)

指導教授 ： 楊宏澤

中原大學/工學院/電機工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700722

摘要

本文旨在研製一太陽能發電整流變流器與市電併聯發電系統，以結合太陽能光電與市電併聯發電，本文所使用系統中以三臂式整流變流器為主架構，因其擁有轉換效率高、控制策略簡易，以及電壓調整等功能，可更有效的利用太陽能源，以提供一穩定可靠的電源。系統內為降低電路設計及控制的複雜度，本文利用數位訊號處理器運算速度快、控制語法簡易的特點，作為系統的控制中心，以期有效的控制本文所提之太陽能發電整流變流器與市電併聯系統。

另為改善現有三臂式整流變流器系統由市電端供電至負載端時，易造成能量轉換損失，明顯地降低系統整體轉換效率的缺點，因此在控制策略中加入四種模式切換，除可改善上述之缺點使得系統效率提高外，結合蓄電池的使用，亦使得本文系統更具備不斷電系統的功能。

為測試所提系統之效能，本文透過以改變系統負載需求的方式，驗證當系統處於正常供電狀況下，其市電、太陽能與負載間能量自動平衡之效果，另在驗證本文系統負載電壓調整之功能方面，本文採用一自耦變壓器連接於市電，改變其電壓值，以驗證市電電壓變動時，本文系統穩定電壓供應於負載的能力。經由實驗結果發現，本文所提之系統的確能達到能量自動平衡以及負載電壓調整等效果，證明了本文所提系統架構的可行性。

關鍵字

太陽能發電 ； 不斷電系統 ； 市電併聯 ； 三臂式整流變流器

並列摘要

This thesis is focused on developing a rectifier and inverter structure for a grid-connected solar photovoltaic (PV) system. The three-armed type of rectifier and inverter is adopted as the main structure of the system, due to its high efficiency、easy operating strategy, and voltage regulating properties. The solar energy can be more effectively employed as a reliable power supply. In order to reduce complexity of circuit design and system control, the digital signal processor (DSP) is used by means of its high calculating speed, simple syntax for programming as a control core of the system. Anticipated is the effective control of the rectifier and inverter structure for a grid-connected solar photovoltaic system.

As the grid supplies the load demand through the three-armed type of rectifier and inverter, energy conversion losses therein occurs. As a result, efficiency of the whole system is degraded. To improve the drawback, four switching modes are proposed and implemented in the system as control strategies. In addition to eliminating the drawback and ameliorating the system efficiency, the integration of battery in the system further equips the system with the characteristics of the uninterruptible power supply (UPS).

To verify the performance of the proposed system, effectiveness of the energy balancing among solar PV, grid power, and load demand is examined. On the other hand, to investigate the function of load voltage regulating, an auto-transformer is used to change the voltage on the grid terminal. The performance of reliable voltage supplying capability of the system can thus be demonstrated. Experimental results reveal that the feasibility of the proposed system is proved in the automatic energy balancing and the load voltage regulating characteristics.

並列關鍵字

Three-arms rectifier and inverter ； UPS ； Solar PV System ； Grid-connected

參考文獻

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