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Keywords

flexible DC distribution network, distributed generation, power fluctuation, modeling and simulation

Abstract

DC power distribution technology greatly reduces the use of converters. After applying this technology, the cost of power grid operation can be significantly reduced and the system reliability and stability is improved also. Under this background, a DC distribution network with both ends is considered, and a typical urban mediumvoltage DC distribution network topology is proposed and simulated. Firstly, the technical advantages of the DC distribution network is explored and compared with the traditional AC distribution network. Then, the feasibility is analyzed for structure of DC distribution network with both ends. Secondly, the power and voltage control model of AC / DC converter and the control model of DC / DC converter is established. Furthermore, the characteristics of photovoltaic and energy storage batteries are analyzed. It is found that the DC distribution network can reduces the converter's Investment and has the advantage of high efficiency and low cost. Finally, the DC distribution network system with both ends is modeled and simulated on the PSCAD / EMTDC platform. It is shown that stable operation of the DC distribution network is achieved by the effective control when photovoltaic, energy storage, and load power fluctuations exist.

DOI

10.19781/j.issn.16739140.2020.01.013

First Page

102

Last Page

108

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