基于太阳能和燃气的多能互补系统热电负荷分配技术研究

Research on heat-electric load distribution for multi-energy complementary system based on solar and gas

随着新能源大规模并网,多能互补是电网发展的必然趋势,对于拥有多台并列运行机组的热电联产电厂面临着基于厂级的负荷分配问题。本文通过研究光伏电站和燃气-蒸汽联合循环机组的运行特性,确定机组的调度限制范围,并选定典型日负荷曲线对多能互补系统进行调度计算,获得实时负荷分配结果;同时,通过对同一负荷下不同机组运行组合方式的研究,获得该负荷下最优的运行组合方式。仿真计算表明:对于本文的研究对象,两抽凝式组合气耗量最小,一背一抽式次之,3台机组同时运行气耗量较大,因此,在机组运行限度范围内,应优先选用两抽凝式运行组合方式;每日在11:00-22:00时间段采用3台机组同时运行,其余时间段内采用2台抽凝式机组运行,可以有效降低机组启停次数。该结论在实现节能降耗的同时,为热电负荷调度提供数据和理论支持。

With the large-scale integration of new energy sources, multi-energy complementary is an inevitable trend of power grid development. For cogeneration plants with multiple parallel operating units, they are faced with plant-level load distribution issues. By studying the operating characteristics of photovoltaic power plants and gas-steam combined cycle units, the scheduling limits are determined in this paper. The typical daily load curve is selected to complete the scheduling calculation for multi-energy complementary system, and the real-time load distribution results are obtained. Meanwhile, the optimal combination mode can be obtained through the research on different operation combination modes under the same load. The simulation calculations show that, the gas consumption of double-condensing unit operation mode is the least, followed by a back and a condensing unit operation mode. The gas consumption of three-unit operating mode is the most. Therefore, within the operating limits, the double-condensing unit operation mode should be preferred. The three-unit operating mode should be operated simultaneously during the period of 11:00-22:00 to effectively reduce the number of starts and stops. It provides data and theoretical support for heat-electric load distribution while achieving energy saving and consumption reduction.