臺灣能源期刊第6卷第1期-臺灣能源期刊論文全文-能源期刊-能源知識庫

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臺灣能源期刊論文全文

出刊日期：March, 2019

Title: Comparison of Two Methods to Solve Linear Programming for Load Shifting Problem on Micro-grid

摘要: 微電網系統整合各種分散式能源，為整合微電網之電力供須以滿足用戶最大用電需求，設計並使用電力排程來滿足此目標。由於電力排程是針對一日之每個時段，個別的做電力供需之撮合，可能會有部分供電吃緊時段用戶用電需求無法得到滿足，而其他部分供電寬鬆時段卻有多餘供電的情形。因此同時使用可轉移負載概念進行電力負載之削峰填谷作業，即在用戶之同意下，將用電需求從供電吃緊時段轉移到供電寬鬆時段，以達到滿足所有用戶全日96時段之最大總用電需求。本文使用線性規劃方法來完成電力負載之削峰填谷作業，並同時使用單形法與內點法來解電力負載削峰填谷作業，經比較，單形法能夠準確的完成削峰填谷作業，但對於高用戶數之削峰填谷作業而言，其執行時間便顯得太慢；相對的，內點法則有較好的執行效率，尤其在高用戶數；此外，內點法對削峰填谷作業首要目標，滿足所有用戶全日96時段之最大總用電需求，已幾乎等同於單形法，準確度幾乎都在99.9%以上。最後，本文建議可結合單形法及內點法，在低用戶數之電力負載削峰填谷作業執行單形法，而高用戶數之電力負載削峰填谷作業執行內點法，以盡可能兼具執行時間效率及準確度。

Abatract: Micro-grid integrates various distributed energy resources. To integrate the micro-grid power supply and demand, and to meet consumers’ power demand, power scheduling process was used to meet the goal. Power scheduling process integrates the micro-grid power supply and demand in each time segment. There may be the condition that some heavy load time segments that consumers’ power demand cannot be met, and some light load time segments that excessive power is not used. Therefore, it performs load shifting operation. That is, with the consent of the power consumer, it shifts the power demand from heavy load time segments to light load time segments to match the power supply and demand for all time segments. In this paper, linear programming is used to carry out load shifting operation. And Simplex and Interior Point methods are used to solve load shifting operation. Simplex method can accurately complete load shifting operation, but it is too slow for large amount of power consumer. On the contrary, Interior Point method is more efficient. The accuracy of Interior Point method is over 99.9% for primary goal of load shifting operation. It is equivalent to Simplex method. Therefore, this paper suggests combining Simplex and Interior Point methods. Simplex method is used for small amount of power consumer, and Interior Point method is used for large amount of power consumer, to get better efficiency and accuracy.