Research On The Voltage Level Sequence In DC Power Distribution Network

With the rapid development of social economy and power electronics technology,DC power distribution network with characteristics of high power quality,large transmission capacity,high reliability,simple structure,good economy and low power loss has more highlighted its technical and economic advantages,received wide attention from scholars at home and abroad.The research on voltage level of DC power distribution network is the basis of DC power distribution technology,and also an important part of distribution system construction.How to choose a reasonable voltage level sequence so that it can adapt to high-speed economic development and meet the needs of the power supply requirements is a practical problem of DC distribution network planning research.There are many factors to be considered in determining the voltage level of DC distribution network.In this paper,the principle and constraint conditions are specified,and the reliability,economy and adaptation assessment indicators of the voltage level of DC power distribution network are analyzed.According to the actual situation of the power distribution network,the Physical model of power supply is determined,the annual cost of the unit load under each scheme is compared by the economic analysis,and the economy of DC power distribution schemes with different medium voltage levels is studied.Based on the multi-layer research index system of voltage level in DC distribution network,the weight of the index is evaluated by AHP,and the DC voltage rating scheme is comprehensively evaluated by TOPSIS multi-objective decision making.Meanwhile,the voltage selections of high voltage,medium voltage and low voltage are analyzed,put forward the reasonable assessment methods and feasible recommendations for the establishment of voltage level sequence in DC distribution network.