Multi-energy System Multi-time Scale Collaborative Optimal Dispatch Considering Reservoir Water Allocation

With the continuous increase in the proportion of renewable energy sources such as wind and light connected to the grid,the coupling degree between electricity,heat and gas is increasing,and research on multi-energy systems has attracted the attention of the academic community.It also exists a certain energy balance relationship between multi-energy system and water.Water energy is converted into electrical energy through hydraulic turbines and pumped storage,realizing energy interaction with the multi-energy system.As a result,the appropriateness of water allocation affects the normal and economic operation of multi-energy system.Therefore,it is necessary to explore the coordinated dispatching mode between reservoir water distribution and multi-energy system.In this paper,a multi-energy system and multi-time scale collaborative optimal dispatching method considering reservoir water allocation is proposed and studied.The main research is as follows:（1）The energy characteristic model of water supply is established The reservoir output is represented in the form of energy,and the water quantity characteristics of the multi-energy system are considered and modeled accordingly.A multi-energy system energy supply model is established.The multi-energy system energy supply equipment contains components such as hydro turbine,pumped storage,gas turbine,boiler equipment,energy storage equipment and other components.Rely on hydro-generator sets and pumped storage to supply energy for the multi-energy system after analyzing the reservoir’s water distribution,taking the operation mode of the coordination and optimization of dispatching of the multi-energy system,and explore the energy balance relationship between the water distribution and the multi-energy system,build an energy balance model based on the energy characteristics of water supply and multi-energy systems.（2）Based on the principle of water allocation,formulate a water demand model and a water distribution satisfaction constraint model including ecology,life,industry,and agriculture.Combined with the basic water demand model and the electricity supply demand of the multi-energy system,design the reservoir adjustable consumption balance model,and formulate relevant constraints of reservoir water supply and electricity supply of multi energy system in the operation process.Finally,a water distribution model is constructed with the objective of maximizing the reservoir allocation benefit,and a multi-constraint criterion is set to allocate water under the premise of satisfying the water demand and the energy supply demand of the multi-energy system The maximum output value of the hydraulic turbine and pumped storage that can participate in the scheduling of the multi-energy system is analyzed through simulation.（3）For the problem of considering the water allocation of water supply and electricity supply demand to participate in coordinated dispatching of multi-energy system,combined with the comprehensive demand response and taking the minimum operation cost of the system as the objective function,a multi-time scale coordinated dispatching model is established,First,establish the daily output plan,and on this basis,adjust the daily output plan through rolling update every 4 hours in the day,and fine power unit output every 15 minutes on the dispatching day;Finally,the proposed coordinated dispatching model of energy supply and water distribution in multi-energy system is verified by example simulation.And under the condition of meeting the water demand,taking the operation cost as the optimization goal,make decisions on dispatching arrangement in different scenarios.