Proceedings ArticleDOI
Quadratic regulator based optimal state feedback controller for stability improvement of inverter based microgrids
Ayesha Firdaus,Sukumar Mishra,Dushyant Sharma +2 more
- pp 2165-2170
TLDR
In this work, an optimal state feedback controller is designed to improve the stability of the two inverter based test microgrid and improves the dynamic response of the individual inverter by providing sufficient damping to the oscillatory modes.Abstract:
Small signal stability of inverter based droop controlled microgrid is a major problem from past decade. In this work, an optimal state feedback controller is designed to improve the stability of the two inverter based test microgrid. The detailed full order small signal model of the test microgrid is developed in state space considering network and load dynamics. Eigen value and sensitivity analysis is done to find out the states which affects the stability of the system and their respective participation in shaping the critical modes of the microgrid. Linear quadratic regulator (LQR) based an optimal controller is then implemented into the single inverter model which provides a state feedback to the open loop system to enhance stability. Eigen value analysis is done using MATLAB to prove that the designed controller improves the dynamic response of the individual inverter by providing sufficient damping to the oscillatory modes. Hence it increases the overall stability of the microgrid.read more
Citations
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Proceedings ArticleDOI
Empirical Mode Decomposition based Identification of Low Frequency Modes in Inverter based Microgrid
Ayesha Firdaus,Sukumar Mishra +1 more
TL;DR: This method of EMD and prony analysis overcomes the requirement of a detailed small signal model which is widely used for the calculation of damping of low frequency oscillation (LFO) in inverter based microgrid.
References
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Journal ArticleDOI
Mode Adaptive Droop Control With Virtual Output Impedances for an Inverter-Based Flexible AC Microgrid
TL;DR: In this paper, a decentralized power control method in a single-phase flexible ac microgrid is proposed in which droop control combined with a derivative controller is used in islanded mode to enhance the power loop dynamics.
Journal ArticleDOI
Secondary Control Scheme for Voltage Unbalance Compensation in an Islanded Droop-Controlled Microgrid
TL;DR: The results show the effectiveness of the proposed control structure in compensating the voltage unbalance in an islanded microgrid.
Journal ArticleDOI
Dynamic Stability of a Microgrid With an Active Load
TL;DR: In this article, an active rectifier and voltage regulator are modeled in nonlinear state-space form, linearized around an operating point, and joined to network and inverter models, and participation analysis of the combined system identified that the low-frequency modes are associated with the voltage controller of the active rectifiers and the droop controllers of the inverters.
Journal ArticleDOI
A Control Methodology and Characterization of Dynamics for a Photovoltaic (PV) System Interfaced With a Distribution Network
TL;DR: In this paper, the authors proposed a control strategy for a single-stage, three-phase, photovoltaic (PV) system that is connected to a distribution network.
Journal ArticleDOI
Power Management of Inverter Interfaced Autonomous Microgrid Based on Virtual Frequency-Voltage Frame
Yan Li,Yun Wei Li +1 more
TL;DR: A reactive power control with adaptive voltage droop method is proposed, which automatically updates the maximum reactive power limit of a DG unit based on its current rating and actual real power output and features enlarged power output range and further improved system stability.