NDLI: Dynamic power flow based simplified transfer function model to study instability of low-frequency modes in inverter-based microgrids

Content Provider	IET Digital Library
Author	Firdaus, Ayesha Sharma, Dushyant Mishra, Sukumar
Abstract	This study proposes a new modelling approach for studying low-frequency oscillations (LFOs) in a droop controlled islanded microgrid. Due to the absence of inertia, these sources are more vulnerable to power and frequency oscillations. Their quick response can introduce faster electrical dynamics in the system which should be monitored from time to time. To ease the analysis process, this study proposes a simplified method for finding LFO in the microgrid. Inspired from the small-signal automatic generation control model of the conventional grid, a transfer function based closed-loop small-signal model of inverter-based islanded microgrid is presented in this study to study power-sharing among the various inverters. The proposed model uses the concept of dynamic power flow through the network to find the power output of each source following load perturbations in a system. Time domain simulation results and eigenvalue analysis is provided to verify the effectiveness of the proposed small-signal model. By comparing the results obtained with actual system simulation in MATLAB/Simulink, it is found that the proposed simplified model is able to predict the stability margin and the LFO of the system without using actual detailed state-space modelling procedure.
Starting Page	5634
Ending Page	5645
Page Count	12
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 23, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/23
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2020.0818
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-09-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Actual Detailed State-space Modelling Procedure Actual System Simulation Closed Loop System Control of Electric Power System Distributed Power Generation Distribution Network Dynamic Power Flow Eigen Values And Eigen Function Faster Electrical Dynamics Inverter Inverter-based Islanded Microgrid Inverter-based Microgrid Invertors Islanded Microgrid LFO Low-frequency Mode Low-frequency Oscillations Power Distribution Fault Power Generation Control Power Output Power System Control Power System Stability Simplified Transfer Function Model Small-signal Automatic Generation Control Model Small-signal Model Study Instability Study Power-sharing Time Domain Transfer Function
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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