Short-term Hydro-wind-photovoltaic-storage Complementary Optimal Operation In Upper Yellow River Basin

With the expansion of installed capacity of wind power and photovoltaic power stations,their volatility,intermittency and irregulability bring new challenges to the operation of power grid.With the advantages of quick opening and closing strong adjusting ability,hydropower is an ideal power source for the consumption of wind power and photovoltaic power.Meanwhile,as the continuous progress of energy storage technology,energy storage power station can also be applied in new energy consumption.Therefore,it is of great significance and application value to study the problem of water-wind-photovoltaic-storage multi-energy complementarity for the full use of clean energy,the optimization of energy structure and the energy conservation and emission reduction.In this study,the multi-energy complementary power station group in the upper Yellow River basin was selected as a case study.On the basis of considering the safe operation of the power grid and the benefits of hydropower,the complementary operation rules of large-scale hydro-wind-photovoltaic-storage power stations under the conditions of different seasons and weather were explored.The natural complementarity between wind power and photovoltaic was revealed.The hydro-wind-photovoltaic multi-objective complementary operation optimization scheduling model and energy storage power station optimization operation model were established.The primary results of this study were shown as follows:(1)A novelly scenario sampling method(Gibbs-LHS)based on Gibbs sampling and Latin hypercube sampling was proposed,and combined with the monthly wind power output per unit value,to applied the extension of wind power scenario data.(2)Simultaneous Backward Reduction was used to screen the typical wind power and photovoltaic output scenarios,and the corresponding probabilities were available.The wind power and photovoltaic complementary evaluation system was established to assess the natural complementarity between wind power and photovoltaics,which included independent power generation performance,complementary,and joint power generation performance.The results indicated that the complementarity between wind power and photovoltaic is limited,which requires the complementary regulation of other adjustable power sources.(3)The hydro-wind-photovoltaic multi-objective complementary operation model with the objectives of maximum daily output of cascade hydropower stations and minimum fluctuation of system residual load is established and solved by NSLDE.The results indicated that there is an obvious and complex competitive relationship between cascade hydropower efficiency and residual load fluctuation.The load tracking ability of system output could be significantly enhanced and the peak and valley difference of residual load could be reduced though the complementary operation of hydropower stations.As the "leading power station" of the cascade hydropower station,Cihaxia hydropower station undertakes the task of regulating the "staggered peak" of complementary operation.Banduo and Yangqu hydropower stations should cooperate with the "staggered peak" operation of the Cihaxia hydropower station,and and undertake the load tracking task as required.(4)Based on the results of optimal operation,the operation rules of hydropower stations and energy storage power station were explored,and the influences of the output fluctuation of wind power and photovoltaic,runoff variation,and nergy storage power station on mult-energy complementary operation.The effect of hydro-wind-photovoltaic complementary operation increases first and then decreases with the increase of runoff,and the optimal runoff of the operation of multi-energy complementary power stations which located in the upper Yellow River basin is 1000m3/s.During the flood season,the large output of wind power at night is conducive to the benefit of cascade hydropower and the reduction of water abandoning of hydropower stations,while the seasonal complementarity of wind power and photovoltaic is not conducive to the hydro-wind-photovoltaic complementary operation.The complementary operation of rainy weather is generally better than sunny weather.(5)The energy storage power station optimization operation model was established,and operation law of energy storage power station was revealed.Energy storage power station can reduce residual load fluctuation,and smooth the hydro-wind-photovoltaic combined output process,and its operating effect increases as the decrease of load fluctuations.