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在供需情况紧张时,有市场力的发电商通常会报高价以获取超额利润,因此有必要定义一种 指标评估这种经济持留行为。经济持留不仅与发电商的报价电价有关,而且与所报高价段上的可 用出力有关。文中提出了报价曲线的低价区、经济持留区、合理冒险区等概念,并根据报价电价与 报价容量的分布关系定义了衡量经济持留的绝对指标和相对指标。绝对指标用来判断整个系统的 持留情况,而相对指标适用于比较不同机组持留行为的严重程度。对实际市场的分析表明,文中定 义的指标能够较准确地衡量市场中的经济持留现象。另外,通过设置经济持留相对指标上限,可以 较好地抑制发电商在容量短缺时报高价的行为。
When supply and demand are tight, market-generating power generators often report high prices for excess profits, so it is necessary to define an indicator to assess such economic retention. Economic retention is not only related to the quoted price of the generator but also to the available output on the reported high price segment. In this paper, the concepts of low price area, economic reservation area and reasonable risk area are put forward, and the absolute index and relative index to measure economic retention are defined according to the distribution of quotation price and quotation capacity. Absolute indicators are used to judge the retention of the entire system, while the relative indicators apply to compare the severity of retention behavior of different units. The analysis of the actual market shows that the indicators defined in the article can accurately measure the economic holding in the market. In addition, by setting the upper limit of the relative index of economic retention, it is possible to restrain the behavior of power suppliers in the high price of capacity shortage times better.