Power Flat Management and Coordinated Control Under different Operation modes for DC Distribution System Based on Voltage Information Coding

The construction of high efficiency, low consumption and reliable DC distribution system is an important way to achieve flexible access and efficient matching of DC source and charge. Compared with AC distribution network, it has a greater development potential. Aiming at the DC distribution system with multi-voltage level and multi-converters connected to the grid, under the different operating modes of the system, a method of voltage information coding is used to carry out flat management and coordinated control for different converters in the system, so as to meet the requirements of rapid response control of the DC system. The droop coefficient is designed and analyzed in frequency domain to ensure stable operation under disturbance. A simulation model based on PSCAD/EMTDC was established to verify the proposed strategy.