| With the continuous development of human society,the energy demand is increasing,and the contradiction between energy and environmental issues is becoming more and more serious.The reform of energy system structure is imperative.The multi-energy complementary energy integration system is proposed to meet the different energy needs of users.It can promote the complementary advantages of energy and reduce environmental pollution.Energy storage also plays an important role as a key device for multi-energy complementary systems.It has a positive role in increasing system economics and improving energy efficiency.Any device that can charge and discharge energy can be called energy storage.The combined use of multiple energy storage devices will definitely have different effects on the system.The different capacities of energy storage devices will also have different effects.Therefore,this paper has conducted in-depth research on the energy storage mode and energy storage capacity configuration of pluripotent complementary systems.First of all,this paper constructs a typical multi-energy complementary system,which is divided into four parts:energy input,energy conversion,energy storage and energy output.The mathematical model of each part of the equipment is described in detail.A unified integrated scheduling model has also been established to describe the requirements that the system should meet.Then,this paper discusses the energy storage mode of the grid-connected multi-energy complementary system,and divides the energy storage mode into seven categories according to the types of energy storage equipment involved in the scheduling.The output constraints of the energy input device,the climbing limits of the controllable unit and the relevant restrictions on the energy storage unit are taking into account.Taking the total cost of the multi-energy complementary system’s daily dispatching as the optimization goal,an optimal scheduling model considering the choice of energy storage mode is established.It can choose the most economical energy storage mode for the system.The synergy between energy storage devices under different modes is further discussed through a case study,and the reasons for the economic differences of different energy storage modes are discussed.The results show that the most economical mode is the gas-electric-heat mixed energy storage mode.The output of each energy storage device is closely related to the corresponding load demand,which is beneficial to alleviate the pressure of three types of load peak shaving.At the same time,it is found that the energy storage capacity has a certain impact on the economics of the system,and the proportion of energy storage capacity in the system should be emphasized.Finally,based on the multi-probability scenario method,this paper establishes a comprehensive capacity allocation model for multi-component composite energy storage system in the grid-connected mode.A capacity allocation method including a electric storage and a heat storage device is proposed.The time series characteristics of load and photovoltaic output are analyzed.The load is divided into eight typical day scenes according to the season and working day.The photovoltaic output is divided into four types of scenes by season.In this paper,the dynamic time warping algorithm is used to combine the fuzzy clustering analysis to make the classification result more representative.And with the help of the improved Fuzzy c-means,the photovoltaic output for each season is divided into multiple probability scenarios.Considering the total operational expectation cost of multiple probability scenarios,this paper proposes a method of configuring energy storage capacity.The sensitivity of energy storage construction cost and natural gas cost is analyzed. |
PDF Full Text Request