Novel Control Strategies for Single-Phase Inverter Based Microgrids Considering Grid Integrated and Islanded Conditions

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Bisht, R. (2021). Novel Control Strategies for Single-Phase Inverter Based Microgrids Considering Grid Integrated and Islanded Conditions. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

This dissertation focuses on designing and developing single-phase inverter (SPIs)control typologies for different microgrid (MG) frameworks. SPIs are considered a major part of the distributed energy resources (DERs), especially at the power distribution level laterals. Thus, effective and collective management of SPIs at normal grid operating conditions and under disturbances is a critical factor for reliable and efficient operation of grid integrated DERs with SPIs. The major contribution of this dissertation is that, first, a local control architecture is designed that works for Stand-Alone (SA) and Grid-Connected (GC) modes of operation of SPI and does not require switching between control modes. The architecture also provides a seamless transfer of the SPIs from GC to SA without compromising the grid quality and confirming to interconnect on standards. Second, a control architecture for multiple inverters connected to the same phase that can share the loads is designed. This is extended to multiple inverters connected to each phase in one lateral during normal operation and under unbalance conditions. Third, an architecture that can be used for grid support function with SPIs connected at different parts of the power distribution network is designed. For this, an adaptive droop-based architecture is explored that identifies the system’s impedance matrix and can be applied for varying network topology. The approach is based on the alternate direction method of multipliers (ADMM) for identifying the grid impedance as a multiple input-multiple output (MIMO) trans. Finally, a coordinated framework is proposed for using SPIs along with legacy grid controllers to support the power distribution system. Overall the results show that the proposed control architectures perform better than the state-of-the-art and also provides grid functions that allow high penetration of SPIs in the power grid.

Details
Author

Bisht, Robin

Title

Novel Control Strategies for Single-Phase Inverter Based Microgrids Considering Grid Integrated and Islanded Conditions

Physical Description

1 online resource (223 pages) : PDF

Date

2021

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

This dissertation focuses on designing and developing single-phase inverter (SPIs)control typologies for different microgrid (MG) frameworks. SPIs are considered a major part of the distributed energy resources (DERs), especially at the power distribution level laterals. Thus, effective and collective management of SPIs at normal grid operating conditions and under disturbances is a critical factor for reliable and efficient operation of grid integrated DERs with SPIs. The major contribution of this dissertation is that, first, a local control architecture is designed that works for Stand-Alone (SA) and Grid-Connected (GC) modes of operation of SPI and does not require switching between control modes. The architecture also provides a seamless transfer of the SPIs from GC to SA without compromising the grid quality and confirming to interconnect on standards. Second, a control architecture for multiple inverters connected to the same phase that can share the loads is designed. This is extended to multiple inverters connected to each phase in one lateral during normal operation and under unbalance conditions. Third, an architecture that can be used for grid support function with SPIs connected at different parts of the power distribution network is designed. For this, an adaptive droop-based architecture is explored that identifies the system’s impedance matrix and can be applied for varying network topology. The approach is based on the alternate direction method of multipliers (ADMM) for identifying the grid impedance as a multiple input-multiple output (MIMO) trans. Finally, a coordinated framework is proposed for using SPIs along with legacy grid controllers to support the power distribution system. Overall the results show that the proposed control architectures perform better than the state-of-the-art and also provides grid functions that allow high penetration of SPIs in the power grid.

Genre

doctoral dissertations

Subjects--Topics

Electrical engineering

Degree

Ph.D.

Keywords

Inverter Controls
Power Management of Distributed Energy Resources
Power Systems
Smart Grids

Subject Area

Electrical Engineering

Advisor(s)

Kamalasadan, Sukumar

Committee Members

Cecchi, Valentina
Ebong, Abasifreke
Tempest, Brett

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2021.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Bisht_uncc_0694D_12787

Permalink

http://hdl.handle.net/20.500.13093/etd:1845