电力市场下边际成本计算方法的解读

Unscrambling of marginal cost algorithm in power market

对边际成本在电力市场中的应用问题进行了深入的研究。通过微观经济学中的边际成本由来以及如何引入电力系统出发,分析了两者的应用前提,得出了目前的边际成本法计算电价所存在的问题。指出了将经济学中成立前提为产品、产量和成本各自独立的边际成本用于功率互相耦合的电力系统是难以接受的;某些情况下之所以顺利应用是由于忽视了网络中任一节点电压都是由所有节点注入功率共同维持的;在理论上,成本曲线上的点其切线斜率变化趋势多样,其中一些根本无法描述边际成本;在应用上,由于其仅适用于POOL模式,则产生了双边交易或多边交易下对电力市场公平性、公正性的考验。

A deep research is made on the application problems of marginal cost in electrical market. Beginning with the description of the origin of marginal cost in microeconomics and its introduction into power system,it derives the problems existing in current marginal cost method used for calculating power price after analyzing the application premise of both. This paper also shows that it is difficult to accept that putting products,output and cost as the premise of the marginal cost in economics,as well as using them in the inter-coupling power systems. It can only be used under certain circumstances which neglects that any nodal voltage is maintained together by all nodal injected power. The variation trend for the tangent slope of the points on cost curves is various in theory,and some of them simply cannot be used for showing the marginal cost. When it comes to the problem of the application,for merely considering the POOL mode,it gives rise to the test for the equity and fairness on power market in bilateral transaction or multilateral transaction.