Design and implementation of an adaptive relay based on curve-fitting technique for micro-grid protection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vinod Vijayachandran ◽  
U. Jayachandra Shenoy
Keyword(s):  
Curve Fitting ◽  
Fault Currents ◽  
Curve Fit ◽  
Overcurrent Relays ◽  
Islanded Mode ◽  
Micro Grid ◽  
The Difference ◽  
Grid Operation ◽  
Micro Grids ◽  
Communication Facility

Abstract The micro-grid should operate in a well controlled manner both during grid connected and islanded mode. Also, micro-grid equipped with conventional overcurrent relays has protection issues during faults due to the difference in fault currents when micro-grid operation changes from one mode to the other. This paper proposes suitable relaying scheme based on curve-fitting technique for micro-grids and performs well without using any extensive communication facility. A new algorithm is developed to create large number of fault data for fitting the curve. The fitness of curve is accessed by measuring the value of coefficient R-squared value (R 2). More number of polynomials is added to improve the value of R 2. Results show that the actual tripping time of the relay is very close to desired tripping time by introducing more number of polynomials. Efficiency of the proposed method is evaluated by comparing with conventional over current relay. The protection logic of the curve-fit relay has been implemented on a TMS32F28377S micro-controller based hardware. A laboratory based experimental setup has been established to test the operational performance of curve-fit relay for a five bus system.

Active and Reactive Power Droop Controller Design for Reliable and Optimal Control of Renewable-Based Micro-Grid

2021 ◽  
Vol 41 ◽  
pp. 111-136
Author(s):  
Peter Anuoluwapo Gbadega ◽  
Olufunke Abolaji Balogun
Keyword(s):  
Reactive Power ◽  
Controller Design ◽  
Control Strategies ◽  
Operation Mode ◽  
Pv System ◽  
Distributed Generations ◽  
Potential Benefits ◽  
Islanded Mode ◽  
Micro Grid ◽  
Micro Grids

Technical concerns about micro-grid dynamics, particularly in autonomous (island) mode necessitate revision of current paradigms in control of energy systems. Advanced control techniques are imperative segments for micro-grid realization. In general, micro-grids and the integration of distributed energy resources (DER) units introduce a number of operational challenges that required to be addressed in the control design and protection systems such that the reliability and stability levels are not affected significantly and subsequently ensured that the distributed generations (DGs) potential benefits are wholly harnessed. In this paper, the micro-grid coordination strategy was investigated by simply analysing the present micro-grid situation and various control strategies. More so, active-reactive power (P/Q) and droop controller based on proportional-integral (PI) and model predictive control (MPC) were designed to control the inverter output of the micro-sources. A micro-grid model, which has two photovoltaic (PV) and one wind turbine (WT) blocks, were built in MATLAB/Simulink to simulate the following three cases in this study. The three cases are as follows, the switching of operation mode between the grid connected and islanded mode, increasing and decreasing of loads in islanded mode and the disconnection of one PV system at a certain time in islanded mode. Therefore, through the simulation analyses, the MPC controller utilized in this micro-grid as compared to the PI controller, achieved desirable efficiency of the inverter’s power control and shared the load power effectively.

A Comprehensive Overview of Different Protection Schemes in Micro-Grids

2013 ◽  
Vol 14 (4) ◽  
pp. 327-332 ◽  
Author(s):  
Sohrab Mirsaeidi ◽  
Dalila Mat Said ◽  
Mohd. Wazir Mustafa ◽  
Mohd. Hafiz Habibuddin ◽  
Mohammad Reza Miveh
Keyword(s):  
Comparative Analysis ◽  
Power Quality ◽  
Comprehensive Overview ◽  
Grid Systems ◽  
Protection Scheme ◽  
Islanded Mode ◽  
Micro Grid ◽  
Micro Grids ◽  
Improve Reliability

Abstract In recent years, there has been an increasing interest in applying micro-grid systems not only to improve reliability but also to enhance power quality. One of the major challenges associated with the implementation of micro-grids is to design an appropriate protection scheme which has the ability to protect micro-grids in both grid-connected and islanded mode. In order to overcome this challenge, different approaches have recently appeared in the literatures. This paper aims to provide an introspective review of the available protection schemes used for addressing micro-grid protection issues in both grid-connected and islanded mode. In addition to description of existing protection schemes to date and categorizing them into specific clusters, a comparative analysis is done in which the merits and demerits of each methodology are evaluated.

Reactive power and voltage regulation in micro grids environment

2013 ◽  
Vol 4 (1) ◽  
pp. 49-56
Author(s):  
I. Vokony
Keyword(s):  
Energy Distribution ◽  
Reactive Power ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Electricity Supply ◽  
Voltage Quality ◽  
Micro Grid ◽  
Grid Operation ◽  
Micro Grids

Abstract This paper is a continuation of the paper “Examination of Micro Grid Operation in Island Condition, Focusing on Voltage Control” [10]. It has presented the assessment of micro grids’ voltage and reactive power control. The increasing integration of intelligent energy distribution networks has to serve the interest of the consumers. Therefore, it is necessary to examine the quality of the electricity supply with regard to the voltage quality as well. How is it possible to ensure the regulation in those cases, e.g. in case of island operation? In the paper the model developed and used for simulating the micro grids are introduced and it is also shown how to apply them for island operation assessment. With the help of a model network the results of the simulations are presented and the conclusions are evaluated.

A Multi-agent based Micro Grid Operation Method

2013 ◽  
Vol 133 (9) ◽  
pp. 1652-1657 ◽  
Author(s):  
Takeshi Nagata ◽  
Kosuke Kato ◽  
Masahiro Utatani ◽  
Yuji Ueda ◽  
Kazuya Okamoto ◽  
...  
Keyword(s):  
Agent Based ◽  
Operation Method ◽  
Multi Agent ◽  
Micro Grid ◽  
Grid Operation

A Review of Classical and Modern Control Techniques Utilized in Modern Microgrids

2021 ◽  
Vol 14 ◽  
Author(s):  
Muhammad Hamza Shahbaz ◽  
Arslan Ahmed Amin
Keyword(s):  
Control Strategies ◽  
Optimal Solution ◽  
Energy Resources ◽  
Control Methods ◽  
Research Gaps ◽  
Control Techniques ◽  
Micro Grid ◽  
Exciting Development ◽  
Micro Grids ◽  
Modern Control

: Because of the consistently expanding energy request, the introduction of a decentralized micro-grid based on energy resources will soon be the most exciting development in the power system. Micro-grids, which are mainly based on inverters, are becoming more popular as they can handle different forms of renewable energy effectively. However, one of the most challenging areas of research is their control. In the last few years, many control strategies have been developed. In this review, different control methods have been discussed that apply to the micro-grid system. Furthermore, the comparative analysis of classical and modern control strategies is also considered. This survey guides the new researchers about all available control strategies and room for improvement towards the optimal solution of the micro-grid control techniques. It also identifies several research gaps and future trends therein as well as provides a solution to manage problems in MGs. The strategies are then compared based on their applicability to different control requirements.

Community Based of CHP Microgrid Optimal Operation

2014 ◽  
Vol 981 ◽  
pp. 673-676
Author(s):  
Rui Li ◽  
Peng Li
Keyword(s):  
Optimal Operation ◽  
Test Results ◽  
Community Based ◽  
Micro Grid ◽  
Grid Operation

This paper presents a community-based CHP microgrid model for optimal operation. The model introduces a microgrid controller and consumption parameters, and that the existing restrictions, the optimization of microgrid operation.bacterial foraging optimization(BFO) algorithm was used to develop microgrid problems. Test results show the effectiveness of the model micro-grid operation.

scholarly journals A Fast Haar Classifier based Gesture Recognition using camShift algorithm and Curve Fitting Method

2012 ◽  
pp. 295-299
Author(s):  
Bhavish Sushiel Agarwal ◽  
Jyoti R Desai ◽  
Snehanshu Saha
Keyword(s):  
Human Computer Interaction ◽  
Gesture Recognition ◽  
Curve Fitting ◽  
Lead Point ◽  
Hand Gestures ◽  
Curve Fit ◽  
Camshift Algorithm ◽  
Fitting Method ◽  
Wide Range ◽  
Curve Fitting Method

The use of hand gestures opens a wide range of application for human computer interaction. The paper makes use of haar classifiers and camShift algorithm to track the movement of hand. Parallelism is introduced at every step by segmenting the data from camshaft into an NxN grid. Every block of the grid now represents a lead point which is calculated from mean of all the points belonging to the particular grid. Now we have only N2 points to recognize the curve that was performed by the user in his action. Finally the fit that was found is compared to pre-defined curve fit data to find out the curve using Mahalanobis equation. Parallelism used in reducing the number of points to be fitted allows the recognition to be faster.

scholarly journals Modeling of micro-grid with the consideration of total harmonic distortion analysis

2019 ◽  
Vol 15 (2) ◽  
pp. 581
Author(s):  
Ibrahim Alhamrouni ◽  
Wira Wahab ◽  
M. Salem ◽  
Nadia H. A. Rahman ◽  
Lili Awalin
Keyword(s):  
Harmonic Distortion ◽  
Rapid Expansion ◽  
Total Harmonic Distortion ◽  
Electricity Grid ◽  
Distributed Generations ◽  
Electrical Grid ◽  
Autonomous Mode ◽  
Quality Stability ◽  
Islanded Mode ◽  
Micro Grid

<p>With the rapid expansion of electricity grid, there yet still places to be covered considering their remote location. Micro-grid (MG) is a solution in this scenario, in fact, there is actually many cases where MG is used in case of emergency and act as a backup to the main electrical grid. By disconnecting itself from the larger grid, a grid that can have many problems, the micro-grid becomes much more flexible in its operations and by continuing to power households and communities alike. Besides grid-connected mode, it is necessary for the MG to operate in autonomous mode. By operating in islanded mode, micro-grids must be able to supply critical load without interruption, run at specific values for voltage and power and extract the maximum power from the distributed generations (DG). Therefore, the modeling of microgrid network considering solar photovoltaic(PV) and wind turbine generation (WTG) system as the distributed generation have been modeled using Matlab/Simulink in this research. Apart from that, the observation of total harmonic distortion(THD) between two operation modes of grid-connected and the islanded-mode is presented in order to analyze the power quality stability towards two operations MG network with same loads size and network parameters.</p>

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