NDLI: Controller design for MTDC grid to enhance power sharing and stability

Content Provider	IET Digital Library
Author	Yadav, Omkar Prasad, Sheetla Kishor, Nand Negi, Richa Purwar, Shubhi
Abstract	Voltage droop control is considered as a reliable control approach for multi-terminal DC (MTDC) grid system. A low value of droop constant may result in a high dynamic variation associated with oscillations for power and DC voltage deviation. Thus, the stability of the MTDC grid is at risk. This study presents a linear quadratic regulator (LQR) control design with an adaptive droop to achieve appropriate power sharing among the converter terminals. A control strategy with the combination of adaptive droop and LQR is designed in this study. The weights of LQR are tuned using the Gramian analysis. The closed-loop stability analysis is carried out using Lyapunov's stability approach. The proposed control scheme improves the closed-loop system dynamics by reducing the overshoots/undershoots and time to reach steady-state condition. In addition, power sharing according to converter rating is appropriately achieved. The performance of the proposed control scheme is validated on five terminal MTDC grid system simulated in MATLAB®.
Starting Page	2323
Ending Page	2332
Page Count	10
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 12, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0880
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-03-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Droop Appropriate Power Sharing Closed Loop System Closed-loop Stability Analysis Closed-loop System Dynamics Control of Electric Power System Control Scheme Control Strategy Control System Analysis Control System Synthesis Controller Design Converter Terminals Distributed Power Generation Droop Constant Gramian Analysis High Dynamic Variation Linear Quadratic Control Linear Quadratic Regulator Control Design Load Flow Control LQR Lyapunov Method Lyapunov's Stability Approach Multiterminal DC Grid System Optimal Control Power And Energy Control Power Control Power Generation Control Power Grid Power System Control Power Transmission Control Reliable Control Approach Stability Stability in Control Theory Synthesis Method Terminal MTDC Grid System Voltage Control Voltage Droop Control
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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