NDLI: PI-based controller for low-power distributed inverters to maximise reactive current injection while avoiding over voltage during voltage sags

Content Provider	IET Digital Library
Author	Miret, Jaume Garnica, Miguel A. Castilla, Miguel Vicuña, Jose Luis Garcia de Camacho, Antonio
Abstract	In the recently deregulated power system scenario, the growing number of distributed generation sources should be considered as an opportunity to improve stability and power quality along the grid. To make progress in this direction, this work proposes a reactive current injection control scheme for distributed inverters under voltage sags. During the sag, the inverter injects, at least, the minimum amount of reactive current required by the grid code. The flexible reactive power injection ensures that one phase current is maintained at its maximum rated value, providing maximum support to the most faulted phase voltage. In addition, active power curtailment occurs only to satisfy the grid code reactive current requirements. As well as, a voltage control loop is implemented to avoid overvoltage in non-faulty phases, which otherwise would probably occur due to the injection of reactive current into an inductive grid. The controller is proposed for low-power rating distributed inverters where conventional voltage support provided by large power plants is not available. The implementation of the controller provides a low computational burden because conventional PI-based control loops may apply. Selected experimental results are reported in order to validate the effectiveness of the proposed control scheme.
Starting Page	83
Ending Page	91
Page Count	9
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 1, Jan (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5071
Journal	IET Power Electronics
Publisher Date	2018-10-25
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Power Curtailment Control of Electric Power System Conventional Voltage Support Current Control Deregulated Power System Distributed Generation Sources Distributed Power Generation Electric Current Control Faulted Phase Voltage Flexible Reactive Power Injection Grid Code Reactive Current Requirements Inductive Grid Invertors Low Computational Burden Low-power Distributed Inverter Phase Current PI Control PI-based Control Loops PI-based Controller Power Distribution Fault Power Electronics Power Generation Control Power Grid Power Plant Power Quality Power Supply Power Supply Quality Stability Stability in Control Theory Supervisory Circuit Voltage Control Voltage Control Loop Voltage Sag
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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