Research On Power Flow Algorithm Of AC/DC Hybrid Distribution Network With Distributed Power

Power flow calculation is the most basic electrical calculation in power system steady-state analysis.At present,with the DC load and the access of distributed generations and the capacity of the AC and DC hybrid distribution network is constantly increasing,power flow calculation method of AC/DC hybrid distribution network of distributed generations brings new challenges.To this end,this thesis studies the power flow calculation of the AC/DC hybrid distribution network with distributed generations supply,and provides a fast calculation and iteration for the state analysis,planning,design and operation scheduling of the AC/DC hybrid distribution network with distributed generations.The method of calculating power flow with good performance has practical significance and application value.In this thesis,by analyzing the operating characteristics of different types of distributed generations,power flow calculation model suitable for power flow calculation applications is established.By analyzing the operating characteristics of the converter and considering the converter loss of the converter,power flow calculation model suitable for power flow calculation application is established.Based on this,combined with the network structure of the AC-DC hybrid distribution network,power flow calculation model of the AC-DC hybrid distribution network with distributed generations suitable for the generalized Tellegen's theorem is constructed.In order to improve the calculation speed of the alternating iterative method in the AC/DC hybrid distribution network with distributed generations and reduce the number of iterations and the amount of calculation,on the basis of in-depth analysis of the alternating iterative power flow calculation method,a current injection type Newton method and Combined generalized Tellegen's theorem for alternating and iterative power flow algorithm of alternating and direct current distribution network.In this thesis,the DC distribution network is respectively connected to the IEEE33 node system and the IEEE69 node system of the distribution network,and the distributed power sources are connected to the AC and DC subnets respectively to form a calculation example.The simulation results of the alternating iteration method based on the generalized Tellegen's theorem and the alternating iteration method based on the current injection Newton method are analyzed and compared to verify the speed and accuracy of the proposed method.