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A unit commitment method for isolated power systems employing dual minimum loading levels to enhance flexibility

机译:一种采用双重最小负载水平以增强灵活性的隔离式电力系统的单位承诺方法

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This paper investigates the benefits from operating thermal units in isolated grids below their technical minimum loading (TML) levels for short time periods, as a means of providing increased flexibility to the system. Such an operating practice is primarily dictated by the fact that small island systems exhibit very high seasonal variability of their load demand. The base load generating units of island systems are usually internal combustion engines (ICE) running on heavy fuel oil, with relatively large capacity and high TML levels. The inflexibility of these units renders in several occasions necessary the dispatch of flexible but costly peaking units, even in low demand periods, to ensure the feasibility of the unit commitment and economic dispatch (UC-ED) problem. Further, renewable energy penetration is severely hampered by the high TML of the base load units. To address such issues, a two-level TML technique is proposed for ICE units of isolated power systems, incorporated in a UC-ED problem based on the Mixed Integer Linear Programming approach. The benefits from this method are evaluated in terms of conventional generation management and cost, as well as regarding the achieved improvement in the penetration of renewables, examining the operation of two indicative island systems.
机译:本文研究了在短时间内以低于其技术最小负荷(TML)的水平在隔离电网中运行热力单元的好处,以此为系统提供了更大的灵活性。这种操作实践主要由以下事实决定:小岛系统的负荷需求表现出非常高的季节性变化。孤岛系统的基本负荷生成单元通常是运行在重质燃油上的内燃机(ICE),具有相对较大的容量和较高的TML水平。这些单元的灵活性不足,因此即使在需求低迷的情况下,也有必要在某些情况下调度灵活但成本高昂的调峰单元,以确保单元承诺和经济调度(UC-ED)问题的可行性。此外,基本负载单元的高TML严重阻碍了可再生能源的渗透。为了解决这些问题,针对隔离电力系统的ICE单元,提出了一种两级TML技术,该技术结合到基于混合整数线性规划方法的UC-ED问题中。根据常规的发电管理和成本,以及通过检查两个指示性孤岛系统的运行情况,评估可再生能源渗透率方面实现的改进,评估了该方法的好处。

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