Optimized FOPID Controller for Transient Stability Improvement in a Microgrid with Energy Storage

International Journal of Electrical and Electronics Engineering

© 2023 by SSRG - IJEEE Journal

Volume 10 Issue 2

Year of Publication : 2023

Authors : C. Srisailam, M. Manjula

10.14445/23488379/IJEEE-V10I2P103

How to Cite?

C. Srisailam, M. Manjula, "Optimized FOPID Controller for Transient Stability Improvement in a Microgrid with Energy Storage," SSRG International Journal of Electrical and Electronics Engineering, vol. 10,  no. 2, pp. 19-34, 2023. Crossref, https://doi.org/10.14445/23488379/IJEEE-V10I2P103

Abstract:

Recently, Direct current (DC) microgrids have gained immense popularity due to their dependable and efficient framework, as well as their high transmission efficiency and low electric power conversion. However, the non-linear nature of Renewable Energy Sources (RESs), the increased presence of power electronic devices and sudden load changes leads to the onset of stability issues in the DC microgrid. Thereby, a DC microgrid structure including Photovoltaics (PV) system, Doubly Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS) and Energy Storage System (ESS) with suitable control approaches is proposed with the aim of enhancing the voltage stability. Here, a higher order Boost converter is employed with Grey Wolf Optimization (GWO) assisted Fractional Order Proportional Integral Derivative (FOPID) controller for enhancing and stabilizing the PV output. The DFIG-based WECS is interfaced to the DC bus using a Pulse Width Modulation (PWM) Rectifier, which in turn is controlled using a Proportional Integral (PI) Controller. The ESS, which optimizes the power flow in the microgrid, comprises of battery and an Isolated Bidirectional Converter (BDC). The generated power from both WECS and PV is supplied to a utility grid via a three-phase Voltage Source Inverter(3 φ VSI), while the grid voltage synchronization is achieved using a PI controller. The proposed microgrid structure is simulated in MATLAB to ascertain its performance, and an excellent efficiency of 98.4% is observed.

Keywords:

PV system, DFIG based WECS, Higher order boost converter, GWO-assisted FOPID controller, ESS, Isolated BDC, PI controller.

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