Design of Single Phase Inverter and Active and Reactive Power Control of Unbalanced Power Distribution Grid

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Subramaniam, S. (2018). Design of Single Phase Inverter and Active and Reactive Power Control of Unbalanced Power Distribution Grid. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

This thesis presents a new d-q based control of single phase grid connected inverters. The inverters are capable of delivering active and reactive power based on the reference set points and/or demand from the load. Also, an on-grid and off-grid control strategy for the single phase inverter has been proposed, that can seamlessly transition from from an "on-grid" state to the "off-grid" state and vice-versa. In this context, a Synchronous Frame PLL has been developed that can help the controller to retain a frequency set point in both the on-grid and off-grid states. Further, a methodology has been proposed for inverter re-synchronization with the grid.In order to support unbalance power distribution grid, a methodology has been designed for single phase load management that takes into account of the size of the inverter and the local load balance required at each phase where the inverter is connected. Both active and reactive power balance are simultaneously introduced with this architecture. As some load changes may be too large for the inverter to supply, an Apparent power limiter is also proposed, such that the active and reactive power reference remains within the operating capacity of the inverter. Finally, a simple droop control model has been proposed for the single phase inverter that can work in grid connected mode. The approach supports active power sharing between inverters by measuring the change in frequency and voltage.

Details
Author

Subramaniam, Shashank

Title

Design of Single Phase Inverter and Active and Reactive Power Control of Unbalanced Power Distribution Grid

Physical Description

1 online resource (147 pages) : PDF

Date

2018

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

This thesis presents a new d-q based control of single phase grid connected inverters. The inverters are capable of delivering active and reactive power based on the reference set points and/or demand from the load. Also, an on-grid and off-grid control strategy for the single phase inverter has been proposed, that can seamlessly transition from from an "on-grid" state to the "off-grid" state and vice-versa. In this context, a Synchronous Frame PLL has been developed that can help the controller to retain a frequency set point in both the on-grid and off-grid states. Further, a methodology has been proposed for inverter re-synchronization with the grid.In order to support unbalance power distribution grid, a methodology has been designed for single phase load management that takes into account of the size of the inverter and the local load balance required at each phase where the inverter is connected. Both active and reactive power balance are simultaneously introduced with this architecture. As some load changes may be too large for the inverter to supply, an Apparent power limiter is also proposed, such that the active and reactive power reference remains within the operating capacity of the inverter. Finally, a simple droop control model has been proposed for the single phase inverter that can work in grid connected mode. The approach supports active power sharing between inverters by measuring the change in frequency and voltage.

Genre

masters theses

Subjects--Topics

Electrical engineering

Degree

M.S.

Subject Area

Electrical Engineering

Advisor(s)

Kamalasadan, Sukumar

Committee Members

Cox, Robert
Ebong, Abasifreke

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2018.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Subramaniam_uncc_0694N_11948

Permalink

http://hdl.handle.net/20.500.13093/etd:1592