An Integrated Planning Approach For Distributed Generation Interconnection In Active Distribution Systems Considering Cyber Coupling Action

With the development of cleaning and great efficiency fuel,as well as the renewable energy generation technology,the large-scale access of distributed generation(DG)supply has been supported by the national policy.The grid-connection of a large number of random distributed generations has an impact on the power quality and operation economy of the power grid.A variety of active control means have been adopt to avoid the deterioration of network performance in active distribution network,and further improves the utilization efficiency of renewable energy.In this context,the operation of active distribution system is highly dependent on the application of information technology.The effect of the effectiveness of information on the operation reliability and safety of the power grid cannot be ignored.Considering the gradual deepening of the coupling between cyber system and the operation of power network,the traditional idea of planning the information and power system as two separate systems needs to be transformed into deploying a suitable cyber system for the power network.As a consequence,a cyber-physical active distribution system(CPADS)planning method is proposed in this paper.The main work is as follows:Firstly,several communication modes of the existing distribution system are investigated,and a research scenario of CPADS joint configuration with the grid-connection distributed generations is established.Based on wireless public network and ethernet passive optical network of cyber system,this paper analyzes the influence of increased grid-connection distributed generations on the function demand and economy of cyber system,and proposes the idea of CPADS planning.Secondly,considering the cyber system costs accounting under functional apportionment,the planning is modeled to search for the appropriate DGs capacities,communication mode,and voltage control frequency with the constraints including performance,construction investment,and out-of-limit voltage probability,aiming at minimizing the construction and operation cost of cyber-physical systems and maximizing the DG penetration level.After that,aiming at solving the above programming model,a step-by-step approach including multi-objective optimization and decision making is proposed.The bi-layer multi-objective programming without considering the random failure of cyber system is adopted to derive the optimal solution set.And the final optimal scheme decision is made based on the probability index of voltage out-of-limit and the potential benefits from the transaction under renewable portfolio standard.Finally,Simulations are conducted on the modified IEEE 33 nodes distribution system.Differential evolution algorithm was used to solve the optimization model,monte carlo simulation to information failure.The results verify the effectiveness of the proposed method.The influence of control frequency and information equipment fault parameters on the planning scheme is analyzed.Compared with the traditional distribution network planning results,the economic advantage of the method proposed in this paper is obvious.The suggestions for the future development of distribution network planning are provided.