Research And Application Of Optimal Load Distribution In Qing River Cascade Hydropower Station

Along with the gradual formation of the hydropower development ideology and the vigorous development of the hydropower business, many river basin cascade hydropower stations emerge as the time requires. Cascade union dispatching, can play the hydrology, storage and electricity's compensation adjustment fully, to avoid the drawbacks of single reservoir operation, and bring more comprehensive benefits to the cascade. Cascade load optimal dispatching is an important part of cascade joint scheduling, in order to distribute the cascade total power which issued by the grid to every hydropower station under the premise of hydropower stations and the power grid's safety and stability, then from the power stations allocated to the unit, to guarantee hydropower stations operate stably and economically.This paper takes Qing River cascade hydropower stations as the research object, on the basis of existing research results, combining the actual situation of Qing River cascade, fully considering operation requirements of different systems such as power grid, power station, reservoir, unit and so on, reasonable disposing the constraints such as power balance, load balance and unit safety, playing the compensation regulation, carries out the research about non-real-time and real-time load distribution optimization of the cascade hydropower stations. Some new ideas and methods are putting forward in the process. Main works are as follows:First of all, propose the three spline interpolation method to fit the full characteristic space surface of the power station, in order to replace the complex calculation of the load distribution between the units. Get the optimal load distribution table with dynamic programming method, and extract three parameters(head, total load, total flow) in the table, make the optimal full characteristic space surface of the station by interpolating fitting, convert units' characteristics to the power station's characteristics, and apply it to the calculation of non-real-time and real-time load distribution of cascade hydropower stations, and both accuracy and efficiency are considered.The next step, carry out non-real-time load distribution research, establish the mathematical model with the goal of minimum energy consumption of the whole cascade, and use a series of mathematical methods such as differential evolution algorithm, three spline surface fitting method, rolling fix of the load balance and power consumption balance, generate the optimal operation mode of hydropower stations, and an example is given in Qing River cascade.At last, based on the non-real-time load distribution, also take Qing River cascade as the object, explore and research the real-time load distribution, establish the mathematical model with the goal of minimum period energy consumption of the cascade. In the cascade distribution, according to the daily consumption requirements, propose a sort and combination method of the stations based on their priorities, and their priorities are based on their deviation of power consumption's integration, use the differential evolution algorithm and the three spline surface fitting method to solve the problem, economically distribute the total load to each station; In the single station distribution, a multi-mode dynamic adjustment method is proposed for avoiding the defect of single distribution mode, so that we can reasonably distribute the station load to its units, ensure the stable operation of the power station.