Real Time Simulation of Modified Bias Based Load Disturbance Rejection Controller for Frequency Regulation of Islanded Micro-Grid

Badal Kumar; Shuma Adhikari; Subir Datta; Nidul Sinha

doi:10.1515/ijeeps-2019-0053

Article

Real Time Simulation of Modified Bias Based Load Disturbance Rejection Controller for Frequency Regulation of Islanded Micro-Grid

Badal Kumar , Shuma Adhikari , Subir Datta and Nidul Sinha

Published/Copyright: September 20, 2019

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From the journal International Journal of Emerging Electric Power Systems Volume 20 Issue 5

Abstract

The paper presents a real time modelling of self-reliant isolated grid comprising both governable and ungovernable sources. The frequency of this system must be maintained to its desired value by reducing its deviation occurred when there is a mismatch between the load demand and the actual power generation. In order to achieve it, the actual power output of the micro-grid is required to regulate. Therefore, an attempt is made in this paper to design a modified bias (MB) with LDR (load disturbance rejection) based PID (proportional integral derivative) Controller and it can also be called droop based controller (DBC). Simulation of the micro-grid system with proposed MB-LDR based control scheme is successfully done in Real Time Simulation platform using the digital simulator of OPAL-RT OP4510. Simulation results of the system for different conditions are presented and analysis is given in details. Thereafter, comparative performance of the results obtained using proposed MB-LDR based controller with that of LDR and classical controllers is made. Results show that the proposed MB-LDR based controller gives better response as compare to other two methods in terms of peak transient deviation, settling time and number of oscillations.

Keywords: micro-grid system; MB-LDR Controller; frequency regulation

Acknowledgement

We would like to extend our heartfelt gratitude to TEQIP-III NIT Manipur for Procuring OPAL-RT Loop Simulator which enabled us to validate all the system resposes in real time platform.

Appendix

A Nominal parameters of the microgrid [15]

fsys = 50 Hz, Pbase = 1 MVA, D = 0.012 MW/Hz, H = 5 s, Tdg= 2 s, Tdt= 20 s, Tfc = 4 s, Tae = 0.2 s, TBESS = 0.1 s, Tfw = 0.1, Kdg=Kdt=Kae=Kfc=KBESS=Kfw=1.

B Nominal parameters of the microgrid [15]

Wind power source (300 KW), Solar Power source (300 KW), load (600 KW), Diesel Generator (400 KW), Fuel Cell (200 KW), Aqua Electrolyzer(100 KW), Battery(30 KWh) and Fly Wheel(30 KWh).

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Received: 2019-02-23

Revised: 2019-08-14

Accepted: 2019-08-30

Published Online: 2019-09-20

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Articles in the same Issue

https://doi.org/10.1515/ijeeps-2019-0053

Keywords for this article

micro-grid system; MB-LDR Controller; frequency regulation