Research On Peaking Cost Compensation Using Cooperative Game

Electricity in "3north" China power system is mainly fire power generations,which really lack of hydropower. With the increasing of wind power and peak-valedifference, the pressure of peak load regulation is growing. At the same time, Powerplants try to transform condensing power plant into thermoelectric unit one after another,because thermoelectric unit has the advantage of high efficiency and low emission. Inheating seasons, the ability of peak load regulation of thermoelectric unit is limitedbecause of heat supply, then, condensing units have to serve depth peak load regulation,and wind turbines have to abandon wind. Now research on calculation of ancillaryservice cost under electricity market is insufficient. So, there comes a serials ofpressing problems such as how to figure out the electricity quantity and cost of depthpeak load regulation, how to allocate the peaking cost compensation to all cogenerationunits.Firstly, this paper introduces the way to transform cogeneration unit and theirrunning characteristic. The operating of thermoelectric unit is seen as parallel operatingof condensing unit and back-pressure turbine. Then, find out the relationship ofparameters in each part, after that, we can get the relationship of coal consumption,thermal load and generated power. On the basis of which, we built up a new optimaldispatching model based on the unit consumption features, in this model, power loadwill be balanced by units in whole network, heat load will be balanced on the spot byeach thermal power plant, wind power limit for the predictive output.Secondly, according to the fact that "3north" China power system contains a largeproportion of thermoelectric units, and the peaking task is mainly assumed bycondensing units, a peaking cost calculation method were proposed. In this method, wecan get the power outputs of all units in two different modes, and then a deeply peakingcost calculation method for non-thermoelectric unit is proposed. An exampledemonstrates that the more peak load regulating capacity condensing unit provide, thehigher it assume the cost. And the peaking cost of wind turbine generators is the highestin the system, while its depth peak load regulating capacity is the lowest, which matchesthe condition that reduce wind abandon as far as possible.Finally, based on cooperative game theory, we built up the cooperative game modelof peaking cost allocation for thermoelectric units. And an improved Shapley Valueconsidering the fact of heat-electricity ratio is proposed. By this improved method, theunit which has higher heat-electricity ratio can get smaller weight and bear lower cost inthe process of allocation. Then, thermoelectric units will be automatically encouraged toimprove their own heat-electricity ratio, which is good for the efficiency of powersystem. The reasonableness of the calculation method was shown by an example. The analytical and experimental results are very useful for the rational use ofpeaking cost calculation in "3north" China power system, peaking cost allocation forthermoelectric units and the effect of heat load variation on peaking cost and costallocation.This research work is supported by the National High Technology Research andDevelopment of China (863Program)(NO.2011AA05A105).