Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations

In literature, for the planning problem of simultaneous distributed generation (DG) and shunt capacitor banks (SCB) allocation in radial distribution networks (RDNs), researchers have focused mainly on the real power loss reduction and ignored the benefits of reactive power loss minimization, which...

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Main Author:	Leghari, Zohaib Hussain
Format:	Thesis
Language:	English
Published:	2021
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/102288/1/ZohaibHussainLeghariPSKE2021.pdf.pdf
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spelling	my-utm-ep.1022882023-08-17T00:34:05Z Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations 2021 Leghari, Zohaib Hussain TK Electrical engineering. Electronics Nuclear engineering In literature, for the planning problem of simultaneous distributed generation (DG) and shunt capacitor banks (SCB) allocation in radial distribution networks (RDNs), researchers have focused mainly on the real power loss reduction and ignored the benefits of reactive power loss minimization, which might not distribute DGs and SCBs at the desirable locations. In addition, a variety of metaheuristic optimization techniques have been employed in literature whose implementation involves either the number of phases or tuning of certain algorithm-specific parameters. In contrast, the Jaya algorithm (JA) is a simple and efficient single-phase optimization algorithm that is free from any parameter tuning. However, the JA also suffers from inadequacies of population diversity and premature convergence; therefore, require a mechanism to overcome these deficiencies. Furthermore, past studies conducted for the islanded networks have followed the approach of isolated operation and did not consider the power supply-demand imbalance condition, which will result allocation of oversized DGs and SCBs. Considering these facts, this research work proposes a two-stage planning approach for the efficient utilization of DGs and SCBs for the simultaneous grid-connected and islanded operations of the RDNs. The first stage determines the optimal installation locations and capacities of DGs and SCBs, and operating power factor of DGs using an improved variant of the JA (IJaya) to minimize the total power loss and voltage deviation during the gridconnected operation. For the proposed IJaya, a dynamic weight parameter based grid-search mechanism has been introduced to mitigate the problem of premature convergence and population diversity in JA. The performance of the IJaya was evaluated using the IEEE 33-bus and 69-bus RDNs. A comparative analysis with existing optimization methods reveals that the IJaya achieves up to 38.84% more reduction in power losses and 3.26% more voltage improvement. In the later part of the study, a methodology concerning the efficient and maximum utilization of the installed DG-SCB capacity in the islanded RDN under power imbalance conditions has been proposed. For that, a multiobjective minimization function incorporating the total power loss and under-utilization of available DG-SCB capacity has been established. To minimize the proposed function, an iterative analytical approach has been proposed to tune the source power factor. The results showed that the underutilization of available DG-SCB capacity varies up to 15.83% for the power factors ranging from 0.8 to 0.93. Expectedly, the proposed study will assist the utility companies to efficiently operate their distribution systems and to design effective energy management schemes for the customers. 2021 Thesis http://eprints.utm.my/id/eprint/102288/ http://eprints.utm.my/id/eprint/102288/1/ZohaibHussainLeghariPSKE2021.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:149286 phd doctoral Universiti Teknologi Malaysia Faculty of Engineering - School of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Leghari, Zohaib Hussain Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
description	In literature, for the planning problem of simultaneous distributed generation (DG) and shunt capacitor banks (SCB) allocation in radial distribution networks (RDNs), researchers have focused mainly on the real power loss reduction and ignored the benefits of reactive power loss minimization, which might not distribute DGs and SCBs at the desirable locations. In addition, a variety of metaheuristic optimization techniques have been employed in literature whose implementation involves either the number of phases or tuning of certain algorithm-specific parameters. In contrast, the Jaya algorithm (JA) is a simple and efficient single-phase optimization algorithm that is free from any parameter tuning. However, the JA also suffers from inadequacies of population diversity and premature convergence; therefore, require a mechanism to overcome these deficiencies. Furthermore, past studies conducted for the islanded networks have followed the approach of isolated operation and did not consider the power supply-demand imbalance condition, which will result allocation of oversized DGs and SCBs. Considering these facts, this research work proposes a two-stage planning approach for the efficient utilization of DGs and SCBs for the simultaneous grid-connected and islanded operations of the RDNs. The first stage determines the optimal installation locations and capacities of DGs and SCBs, and operating power factor of DGs using an improved variant of the JA (IJaya) to minimize the total power loss and voltage deviation during the gridconnected operation. For the proposed IJaya, a dynamic weight parameter based grid-search mechanism has been introduced to mitigate the problem of premature convergence and population diversity in JA. The performance of the IJaya was evaluated using the IEEE 33-bus and 69-bus RDNs. A comparative analysis with existing optimization methods reveals that the IJaya achieves up to 38.84% more reduction in power losses and 3.26% more voltage improvement. In the later part of the study, a methodology concerning the efficient and maximum utilization of the installed DG-SCB capacity in the islanded RDN under power imbalance conditions has been proposed. For that, a multiobjective minimization function incorporating the total power loss and under-utilization of available DG-SCB capacity has been established. To minimize the proposed function, an iterative analytical approach has been proposed to tune the source power factor. The results showed that the underutilization of available DG-SCB capacity varies up to 15.83% for the power factors ranging from 0.8 to 0.93. Expectedly, the proposed study will assist the utility companies to efficiently operate their distribution systems and to design effective energy management schemes for the customers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Leghari, Zohaib Hussain
author_facet	Leghari, Zohaib Hussain
author_sort	Leghari, Zohaib Hussain
title	Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
title_short	Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
title_full	Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
title_fullStr	Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
title_full_unstemmed	Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
title_sort	efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Engineering - School of Electrical Engineering
publishDate	2021
url	http://eprints.utm.my/id/eprint/102288/1/ZohaibHussainLeghariPSKE2021.pdf.pdf
_version_	1776100888135335936

Efficient framework for integrating distributed generation and capacitor banks considering simultaneous grid-connected and islanded distribution network operations

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