Research On Power Output Bound Of Cogenerator And Application On Energy-efficient Scheduling

The “Three Northern” area where wind resource is abundant has a freezingwinter, so the cogenerator which can provide heat has a big proportion. With the fastdevelopment of wind power, much wind power has to be abandoned because thathydropower is short, power output of cogenerator is high and wind power is surplus.The cause of abandoned wind power is that the power output of conventionalunit is too high, and the high minimum power output of cogenerator is the mainreason. It has a significance to study on the power output range of cogenerator todecrease the abandoned wind power.First, the paper analyzes the diagram of cogenerator and establishes equationsfor the boundary lines. The function relationship of cogenerator's power outputrange is calculated by analyzing the power output when the extraction line variesand simultaneitying according equations.In regular scheduling model, the upper and lower limit of cogenerator's poweroutput are fixed which makes that much wind power is abandoned. The paperestablishes a new energy-efficient scheduling model containing cogenerator,thermal power unit and a wind power plant in which the upper and lower limit ofcogenerator's power output vary with different extraction according to the functionrelationship obtained aboved so that less wind power will be abandoned. Theobjective function is the least coal consumption, guaranteeing that the abandonedwind power is the least.Then, an improved particle swarm optimization algorithm is presented to solvethe new scheduling model different from regular scheduling model which has morethan one equality constraint and in which the upper and lower limit of cogenerator'spower output vary. The improved particle swarm optimization algorithm givesindustrial extraction, heating extraction and power output different priorities.Functions including load balance predicting, next position predicting and timelimiting of loop are added. The program includes two steps: the least abandonedwind power predicting and the load dispatch calculation of least coal consumption.At last, one scheduling algorithm is programmed according to the newscheduling model. At the end of the paper, the example demonstrates that the studyof analyzing the power output range can reduce the abandoned wind power and coalconsumption.