Distributed Generation And Generalized Energy Storage Planning In Distribution Network With Operation Characteristics

With the increasing shortage of fossil energy and environmental pollution,more and more distributed generation is being connected to the distribution network.Its random.fluctuating and low controllability characteristics not only put the safe and stable operation of the system to a great test,but also increase the complexity and uncertainty of distribution network planning.To further promote the development and use of new energy sources,energy storage technology is widely used.Due to its advantages of smoothing out voltage fluctuations and regulating power stability,the demand for energy storage devices is increasing day by day.At the same time,with the development and promotion of demand response in active distribution networks,the user-side load is gradually transformed from rigid to flexible.The flexible load is able to provide direct auxiliary services to the user with virtual energy storage functions,which is called generalized energy storage together with the traditional practical energy storage device.The rational use of flexible loads can effectively improve the load power curve,achieve peak and valley reduction and upgrade system economics,which have become a new element in the current demand response and distribution network planning research that cannot be ignored.However,the increasing penetration of distributed resources such as distributed generation,energy storage and flexible loads in the distribution network has put forward higher requirements for the economic,reliable and efficient operation of the system,and it is necessary to conduct relevant research on the operational characteristics and collaborative planning of distribution networks with multiple distributed resources.and to work out a suitable planning scheme for the operation mode of active distribution networks.Firstly,the components of the distributed generation and generalized energy storage are defined,and the operational characteristics of each element are analyzed.Based on this,the mathematical models of photovoltaic,wind power,flexible loads and energy storage batteries are established.Secondly,in order to meet the load response demand of distribution network planning under the new background,its calculation model is constructed from four aspects of load change rate,response rate,response probability and peak-to-valley differential,and a distribution network operation strategy that takes into account the demand response potential of flexible load is formulated.Then,a joint operation-planning model with distributed power sources and generalised energy storage is developed from the perspective of economy,reliability and sustainability,giving full play to the operational advantages of multiple resources.Furthermore,an improved adaptive parameter grid particle swarm optimization algorithm is used to solve the multi-objective programming model iteratively,and the location and capacity scheme of distributed power supply and generalized energy storage and the scheduling power strategy of resources are obtained.Finally,the feasibility and effectiveness of the method proposed in this paper are verified by means of the IEEE 33 node analysis,which provides reference for the operation strategy and planning construction of distributed generation and generalized energy storage.