Optimal Configuration of DC-DC Converters in DC Distribution Network

Improving the operating efficiency of DC distribution network is one of the key problems in DC field. In this paper, an optimal configuration strategy of DC-DC converters was carried out to improve the operating efficiency of DC distribution network. Firstly, the energy conversion efficiency-load rate character of DC-DC converters was explained. Secondly an optimization model was established with the highest average operating efficiency and the lowest installation charge as the objective functions to optimize the converter model and capacity of each node. Then, the improved non-dominant sequencing genetic algorithm (NSGA-II) was used to solve the Pareto optimal solution of the multi-objective optimization, and the optimal allocation scheme was obtained. Finally, a model of DC distribution network with double single-ring structure was built. Based on the model, the effectiveness of the proposed optimal configuration strategy was verified.

[1]  Mohammad Shahidehpour,et al.  Integrated Optimization of Network Topology and DG Outputs for MVDC Distribution Systems , 2018, IEEE Transactions on Power Systems.

[2]  Siew-Chong Tan,et al.  Plug-and-Play Voltage Ripple Mitigator for DC Links in Hybrid AC–DC Power Grids With Local Bus-Voltage Control , 2018, IEEE Transactions on Industrial Electronics.

[3]  Bin Wu,et al.  Electric Vehicle Charging Station With an Energy Storage Stage for Split-DC Bus Voltage Balancing , 2017, IEEE Transactions on Power Electronics.

[4]  A. Sannino,et al.  Efficiency analysis of low- and medium- voltage DC distribution systems , 2004, IEEE Power Engineering Society General Meeting, 2004..

[5]  F. Wang,et al.  Ac vs. dc distribution for off-shore power delivery , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[6]  Guangfu Tang,et al.  Modeling and Damping Control of Modular Multilevel Converter Based DC Grid , 2018, IEEE Transactions on Power Systems.

[7]  Juan C. Vasquez,et al.  Stability Enhancement Based on Virtual Impedance for DC Microgrids With Constant Power Loads , 2015, IEEE Transactions on Smart Grid.

[8]  Zhichang Yuan,et al.  Research on Topology of DC Distribution Network Based on Power Flow Optimization , 2017, 2017 IEEE International Conference on Energy Internet (ICEI).

[9]  L.M. Tolbert,et al.  AC vs. DC distribution: Maximum transfer capability , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.