Study On Benefit Allocation Mechanism Of Joint Dispatching Of Hydropower Stations

In the power market environment,the power grid and the power generation parties are independent of each other,and the power grid dispatching operation faces enormous challenges.Hydropower,as the main peaking power supply for the grid,does not consider the system’s ability to absorb power when deciding on a power generation plan under a decentralized decision,and it is difficult to meet grid peaking requirements.If the hydropower stations is jointly optimized by the power grid,there will be divergence between the stations.Due to the different interests of the power stations,each power station does not meet the power generation plan arranged by the power dispatching center and want to gain more power generation benefits.Nowadays,the group scheduling of hydropower stations tends to be jointly optimized,and joint optimization and scheduling can make regional water resources be efficiently configured and better meet the operational needs of the power grid.Under such circumstances,a major problem that the power grid urgently needs to solve is how to effectively,fairly and reasonably distribute the power generation benefits of various stakeholders.People have been studying the joint optimal scheduling of hydropower stations for a long time.There are a large number of research results in the optimization of the scheduling model and compensation benefit sharing.However,in the new situation of the electricity market,how to more accurately define compensation benefits and design a more practical and reasonable compensation benefit sharing method are problems we need to solve.Based on this,the article has done the following research rely on practical problems.(1)Determine the benefits of the joint scheduling of hydropower stations by decentralized dispatch method.For the sake of fairness,the inflow of power generation plans for each power station is based on natural runoff from the site.Since the actual capacity of the grid is limited,the total output of the decentralized dispatch is based on the system load.Using the principle of "capitalizing the upper limit and deducting the original value" determine the actual total output of the decentralized schedule.For the "upper limit" period,the load distribution problem was transformed into the cooperative strategy benefit distribution problem,and the power plant output was distributed according to the cooperative solution satisfaction model.(2)Taking into account the demand for hydropower peaking,the scheduling load curve is given.The joint optimization scheduling of the hydropower stations is based on the maximum power generation model,and the POA-SADDDP coupling algorithm is used to solve the model.The compensation benefits from joint scheduling are obtained by subtracting the power generation efficiency of the decentralized decision from the power efficiency of joint dispatch.(3)The characteristics of the existing compensation benefit sharing method are analyzed in detail.Based on this,a compensation benefit allocation model based on the TOPSIS method is proposed to make a fair and reasonable allocation of compensation benefits.(4)The results of a certain year’s data from the Yuanshui River Basin in Hunan Province were selected to verify the case.The final distribution results showed that this kind of joint dispatching benefit sharing method was easily accepted by various stakeholders.The benefit generated by all interest subjects was greater than the benefit of their independent operation.The compensation benefit distribution model based on the TOPSIS method is simple to calculate and the assessment result is fair and reasonable.It highlights the importance of adjustable power stations in joint dispatch.