Research On Optimal Dispatch Of Active Distribution Network Considering Demand-side Response

With the rapid development of economy and society,the shortage of traditional energy source,and the resulted environment problems,renewable energy power generation has attracted more and more concern.The characteristics of volatility and randomness inherent in renewable energy have a certain degree of influence on the safe and stable operation of the system.Traditional distribution network can't support the integration of power generated by large-scale renewable energies,so active distribution network has been developed,and the traditional distribution network is gradually transformed into active and flexible active distribution network.Active distribution network can improve the integration capacity of renewable energy through active management of the distributed generation,storage and demand-side controllable resources,and reactive power compensation equipment.It provides a solid foundation for the power system safe,stable and economic running.The main contents of this paper are list as follow:(1)The concept and basic characteristics of active distribution network are summarized.The power characteristics of distributed generation unit and energy storage unit in active distribution network are analyzed,and mathematical models are established.and the pattern on the demand response is also discussed.(2)Based on the property of distributed storage,Economic optimization dispatching model of active distribution network was set up in order to reduce the operating cost.Through the coordination of the distributed energy storage charge/discharge and the optimization of micro gas turbine,the operating cost reaches lowest.Because of the weakness in global optimization capability of the basic particle swarm algorithm,the simulated annealing idea is applied to promote that.The built optimal scheduling model is solved.Finally,the correctness of the economic scheduling model and the effectiveness of the algorithm are proved by the simulation analysis of a numerical example.(3)First,the relationship between demands responses model of two different types(price type and incentive type)are analyzed considering of the demand response towards the optimization of active distribution network.From the view of the distribution network company,the minimum load peak-valley difference is the objective function and the time-of-use electricity price is used as the control part.Then,based on the characteristics of demand side response,the optimal dispatching model of active distribution network is established.By coordinated and optimized control of distributed generation,energy storage and demand side controllable load,the operation cost of active distribution network is minimized,and the coordinated optimal dispatching of source,storage and load of distribution network is realized.Finally,the improved IEEE33 node test system is used to analyze and verify the rationality of the scheduling model introduced in this chapter.(4)Based on distributed generation,energy storage and demand-side response coordination scheduling,capacitors banks and static VAR compensators are added as reactive power regulation units to take part in the optimal scheduling of active distribution networks jointly.Further considering the regulation ability of active and reactive power controllable units,and take the minimum operating cost of the distribution network and the minimum voltage deviation as the objective function to construct a multi-objective optimal dispatching model for the active distribution network.The ideal point method is applied to deal with the multi-objective model.And the model developed in this chapter is solved by the improved particle swarm algorithm,and the modified IEEE33 node system is used as an example to prove the feasibility of the multi-objective optimal scheduling model.