A Centralized Shifted Voltage Control Method for Accurate Power Sharing in DC Islanded Microgrids | Zendy

MinhDuc Pham | Zendy; Hong Hee Lee | Zendy

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A Centralized Shifted Voltage Control Method for Accurate Power Sharing in DC Islanded Microgrids

Author(s) -

MinhDuc Pham,

Hong Hee Lee

Publication year - 2021

Publication title -

renewable energy and power quality journal

Language(s) - English

Resource type - Journals

ISSN - 2172-038X

DOI - 10.24084/repqj19.242

Subject(s) - voltage droop , microgrid , voltage drop , voltage , control theory (sociology) , voltage regulation , controller (irrigation) , computer science , voltage controller , voltage reference , voltage optimisation , engineering , voltage source , electrical engineering , control (management) , artificial intelligence , agronomy , biology

Due to line impedance mismatch among renewable energy sources (RESs), it is hard to realize accurate power sharing in the DC microgrid system. To solve this issue, a distributed power sharing strategy for adjusting the RES output voltage is developed by adding shifted output voltage into each local controller. Thanks to the shifted voltage, the influence of voltage drop caused by the droop controller is effectively mitigated, so that the DC bus voltage is constantly balanced regardless of the load changes. The proposed method is realized with a centralized approach, and all the required control variable to determine the reference voltage is transmitted through low-bandwidth communication. The controller design and system stability are analyzed in detail with a simplified microgrid model. Small-scale DC microgrid is simulated to verify the effectiveness of the centralized shifted voltage control method.

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