Power Research

M. Venkata Kirthiga ¹, S. Arul Daniel ¹

Affiliations
1 National Institute of Technology Tiruchirappalli, Tirucirappalli-620015, Tamil Nadu, IN

Abstract

Distribution Systems with optimally sized Distributed Generators(DGs) placed at optimal locations would become Micro-grids. These micro-grids operate either in non-autonomous mode (in conjunction with the utility grid) or in autonomous mode (in the absence of the utility grid) depending on the penetration level and sustainability of the DGs connected. This paper has suggested an optimal structure for autonomously operated micro-grids by re-configuring the radial system into a weakly meshed system. The deliverables of the proposed reconfiguration strategy in autonomous micro-grids are discussed in detail in this paper. The proposed reconfiguration strategy is found to ensure continuous power supply to the select customers of the micro-grid by enhancing a stable operation of the generators to avoid formation of accidental islands on line outages and minimizing the distribution losses. MATLAB code has been developed for the proposed methodology of reconfiguration and the standard 33 bus distribution system has been used to validate the proposed algorithm.

Keywords

Distributed Generation, Autonomous Micro-grids, Re-configuration, Weakly Meshed Systems, Particle Swarm Optimization

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N. S. Suresh ¹, S. Arul Daniel ¹

Affiliations
1 EEE Department, National Institute of Technology, Tiruchirappalli – 620015, Tamil Nadu, IN

Abstract

This paper proposes a novel current controller for grid connected inverter. It is a new variant of non-linear Model Predictive Controller (MPC) which is modified from the available MPCs widely applied in chemical process systems. This proposed MPC is developed such that to adapt for fast response systems such as micro-grid and smart-grid systems. Using Matlab/Simulink a micro-grid system model with one inverter and local loads connected to grid is developed to study the new MPC along with already available Proportional Integral controller and hysteresis controller.

Keywords

Model Predictive Control, Smart Grid, Voltage Source Inverter

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N. S. Suresh ¹, S. Arul Daniel ¹

Affiliations
1 EEE Department, National Institute of Technology, Tiruchirappalli – 620015, Tamil Nadu, IN

Abstract

Interest in the integration of renewable energy with utility network and Distributed Generation (DG) using inverters is on the rise. The parallel operation of inverters must be studied closely for achieving better power quality. Issues in controlling these parallel connected inverters to a micro-grid have been brought to focus in this paper. This paper defines metrics for comparing the various control strategies for grid-connected inverters. Ten such control strategies are taken up and evaluated against the proposed eight metrics. The results of the comparison are presented in this paper.

Keywords

Control Strategy, Metrics, Model Predictive Control, Parallel Inverter

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