Capacity enhancement and flexible operation of unified power quality conditioner in smart and microgrid network

Shafiuzzaman Khan Khadem; Malabika Basu; Michael F. Conlon; Shafiuzzaman Khan Khadem; Malabika Basu; Michael F. Conlon

doi:10.3934/energy.2018.1.49

AIMS Energy

2018, Volume 6, Issue 1: 49-69. doi: 10.3934/energy.2018.1.49

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Research article Topical Sections

Capacity enhancement and flexible operation of unified power quality conditioner in smart and microgrid network

1.
International Energy Research Centre, Tyndall National Institute, Dyke Parade, Cork, Ireland
2.
School of Electrical & Electronic Engineering, Dublin Institute of Technology, Ireland

Received: 29 October 2017 Accepted: 01 January 2018 Published: 04 January 2018

This paper presents a new approach to design Unified Power Quality Conditioner (UPQC), termed as distributed UPQC (D-UPQC), for smart or microgrid network where capacity enhancement and flexible operation of UPQC are the important issues. This paper shows the possibility of capacity enhancement and operational flexibility of UPQC through a coordinated control of existing resources. This UPQC consists of a single unit series active power filter (APFse) and multiple shunt APF (APFsh) units in a distributed (parallel) mode. These units can be connected with a common/separate dc linked capacitor(s). The requirement of capacity enhancement arises from the flexibility to cope up with the increased harmonic load demand at low voltage (LV) distribution network. This can be accomplished by a coordinated control where multiple APFsh units are operated by utilizing the capacity of APFse while it is in idle/low mode using. Operational flexibility can be accomplished by compensating (i) the reactive and harmonic current individually or (ii) splitting the combined reactive and harmonic current/power among the APFsh units. Design and control issues have been discussed to identify the capacity enhancement limit with the possibility of operational flexibility. A system then has been simulated in MATLAB to show the effectiveness of D-UPQC in capacity enhancement and flexible operation by applying its existing resource utilization capability.
- unified power quality conditioner,
- power quality,
- distributed generation,
- capacity enhancement,
- flexible operation,
- active power filter,
- smart grid,
- microgrid
Citation: Shafiuzzaman Khan Khadem, Malabika Basu, Michael F. Conlon. Capacity enhancement and flexible operation of unified power quality conditioner in smart and microgrid network[J]. AIMS Energy, 2018, 6(1): 49-69. doi: 10.3934/energy.2018.1.49

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Abstract

This paper presents a new approach to design Unified Power Quality Conditioner (UPQC), termed as distributed UPQC (D-UPQC), for smart or microgrid network where capacity enhancement and flexible operation of UPQC are the important issues. This paper shows the possibility of capacity enhancement and operational flexibility of UPQC through a coordinated control of existing resources. This UPQC consists of a single unit series active power filter (APFse) and multiple shunt APF (APFsh) units in a distributed (parallel) mode. These units can be connected with a common/separate dc linked capacitor(s). The requirement of capacity enhancement arises from the flexibility to cope up with the increased harmonic load demand at low voltage (LV) distribution network. This can be accomplished by a coordinated control where multiple APFsh units are operated by utilizing the capacity of APFse while it is in idle/low mode using. Operational flexibility can be accomplished by compensating (i) the reactive and harmonic current individually or (ii) splitting the combined reactive and harmonic current/power among the APFsh units. Design and control issues have been discussed to identify the capacity enhancement limit with the possibility of operational flexibility. A system then has been simulated in MATLAB to show the effectiveness of D-UPQC in capacity enhancement and flexible operation by applying its existing resource utilization capability.

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