電業自由化下轉供費率計算方式之研究

配合電業自由化，我國行政院提送之電業修正法草案中規範我國未來電業架構係以雙向合約為主，因此轉供行為便將隨之產生，如何決定一適合我國市場之計價方式，亟需深入研究探討。本文除彙整數種一般常見之轉供費率計算方式，例如郵票法及以百萬瓦哩法為基礎之四種計價方法：電力潮流百萬瓦哩法、模數法、零反潮流法和主要潮流法外，並針對各計價方式含意以及優、缺點加以描述。此外，亦探討以邊際成本為基礎之轉供費率計算方式。為了膫解轉供交易對於原系統之影響，本文採用增量技術方式評估轉供交易注入量對於合約路徑之線路潮流變化之影響，亦提出相關原則以避免誤差過大發生。為驗證相關之轉供費率計算方式之可行性，本文於台電簡化系統之假設測試系統內，假設含有兩個不同特性之轉供交易案例，進行模擬試算其成本分攤。文中除利用PSS/E最佳電力潮流法軟體，求解系統含有雙向合約之總發電成本最小化問題外，進而利用所得之各匯流排邊際成本計算以短期邊際成本為基礎之轉供費率。經由模擬結果顯示，各轉供費率計價方式之成本分攤雖各有其合理性，惟主要潮流法之轉供費率計算方式較為實際且客觀，可提供未來相關研究參考。

關鍵字

轉供費率；雙向合約；短期邊際成本

並列摘要

Following the trend of power industry liberalization, the revised Electricity Act Draft proposed by the Executive Yuan defines the future bilateral-contract based electricity market. In the market the power wheeling activities will arise. Therefore, it is worth studying in depth how to determine the power-wheeling tariffs that fit our future power market. The thesis collects the widely used power wheeling tariff computational methods, such as the postage stamp method and the four MW-mile based methods that include power flow based MW-mile method, modulus method, zero counter-flow method, and dominant flow method. The meanings, advantages and disadvantages of these methods are explored in the thesis. Besides, the short-run marginal cost (SRMC) based power wheeling tariff computation is investigated. To observe the effects of power wheeling on the power system operations, the thesis uses an incremental technique to evaluate the influences of the power wheeling injection on the line flow variations on the contract path. Rules of thumb are suggested to avoid the errors occurring in the sensitivity analysis for the incremental technique employed. To verify the feasibility of the related power wheeling tariff computations, two cases are studied in the simplified test systems. The test systems are adapted from the practical Taipower system. The PSS/E optimal power flow package is utilized to solve the minimal generation cost problem of power system with the bilateral contracts. Based on the marginal costs of the buses of the system obtained from the PSS/E package, the SRMC based power wheeling tariffs are computed. The simulation results reveal that the methods of power wheeling tariff calculations mentioned above are applicable for respective cases in the test systems. However, the dominant flow method seems more practical and unbiased than the others. The results derived in the thesis can be used as references for future studies.

並列關鍵字

power wheeling tariff ； short run marginal cost ； bilateral contract

參考文獻

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電業自由化下轉供費率計算方式之研究

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