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access icon openaccess Rapid modelling for flexible DC distribution network considering droop control

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 04/09/2018, Accepted 19/09/2018, Published 23/10/2018

With the growth of DC electricity load, the difficulty to improve the power quality, and the increasing penetration of renewable power, flexible DC distribution network, which contains complex renewable energy generation equipment and a large number of power electronic converters, become an important research direction. The modelling of the DC distribution network is an essential step for the research on the coordination control. However, the traditional modelling will be a burden for simulation software. This article models all electrical devices as equivalent power sources based on the proportional–integral control and the power–voltage curve, ignoring the complex internal control processes. Based on the simplified models of power, load, DC/DC converters, and AC/DC converters considering droop control, a simplified model of a multi-terminal flexible DC distribution network is derived. Taking the impact of droop control into account, the simulation of DC distribution power flow under the different distribution of generation and load is done. Results show that the simplified model of DC distribution network with droop control can accurately and rapidly simulate the transient process and steady states of the testing network.

Inspec keywords: PI control; power distribution control; load flow control; electric current control; DC-DC power convertors; AC-DC power convertors

Other keywords: coordination control; electrical devices; power electronic converters; DC distribution power flow; proportional–integral control; power quality; DC electricity load growth; equivalent power sources; DC-DC converters; complex internal control processes; multiterminal flexible DC distribution network; AC-DC converters; complex renewable energy generation equipment; droop control; power–voltage curve

Subjects: AC-DC power convertors (rectifiers); Distribution networks; Power system control; DC-DC power convertors; Control of electric power systems; Current control

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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2018.8874
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