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access icon openaccess Universal droop controller for DC–DC converter interfaces onto a modular multi-tiered DC microgrid

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 25/06/2018, Accepted 30/07/2018, Published 22/01/2019

Microgrids are usually based on single voltage levels, supporting a number of distributed generation sources and loads. This paper describes a multi-tier DC microgrid, with multiple voltage levels able to source and supply different power demands. A universal droop controller is developed for this multi-tier microgrid, able to connect uni- and bi-directional elements on to the grid. Simulations are used to demonstrate the functionality of the controller to allow autonomous load sharing based on decentralised control, with bi-directional power transfer between tiers to balance supply and demand at each level. Power can also be directly sent from one element of the microgrid to another, which is demonstrated through simulation, allowing for integration with future peer-to-peer energy trading systems.

Inspec keywords: DC-DC power convertors; distributed power generation; decentralised control

Other keywords: bi-directional elements; decentralised control; loads; demand; different power demands; supply; bi-directional power transfer; universal droop controller; multiple voltage levels; multitier microgrid; autonomous load; modular multitiered DC microgrid; multitier DC microgrid; DC–DC converter; distributed generation sources; single voltage levels; tiers

Subjects: DC-DC power convertors; Multivariable control systems; Control of electric power systems; Power convertors and power supplies to apparatus; Distributed power generation

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