Viability study to implement peak load shaving at UCT Medical School

Master Thesis

2007

Permanent link to this Item
http://hdl.handle.net/11427/5265
Files
thesis_ebe_2007_cornelio_m_m.pdf (16.71 MB)
Authors
Cornelio, Antonio M M
Supervisors
Malengret, Michel
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
Publisher

University of Cape Town

Department
Department of Electrical Engineering
Faculty
Faculty of Engineering and the Built Environment
License
Series
Abstract
This Master thesis investigates the application of Peak Load Shaving (PLS) at University of Cape Town Medical School (UCTMS). The purpose was to decrease the monthly maximum demand (MMD) in kVA such that UCTMS monthly electricity bill is decreased. It was purposed that implementing a three-phase inverter in conjunction with a lead-acid battery at UCTMS for PLS is technical and financial viable. Five-year UCTMS MMD data history was gathered from UCT maintenance office as well as eight-month UCTMS load profile, which was gathered using the available electrical meter at Electrical Department Substation for Medical School at FalmouthRoad. Control strategies studies from previous works enabled the quickly synchronization of the three-phase inverter to a three-phase grid. It gave a good quality balanced control of the three-phase currents through the filter inductors, consequently gave a good quality control of the real and reactive power. Secondly a PLS algorithm (PLSA) was developed, which had the aim of setting a threshold point (TP) to prevent the MMD supplied to UCTMS to surpass the TP. In addition, the PLSA in conjunction with designed controllers would charge the battery at unity power factor (PF), whenever the MD is below the set TP and discharge at the same PF conversely, hence limiting the MMD at the TP. To test the purposed PLS topology, simplorer simulator was used, where two daily UCTMS load profile were simulated. The controls design and PLSA were implemented and the result showed that implementing PLS at UCTMS is technical viable. In practice, a prototype was built to show the synchronization of the three-phase inverter with three-phase grid by using a digital phase locked loop PI-based controller implemented in a DSP chip.
Description

Includes bibliographical references (p. 189-191).

Keywords
Electrical Engineering

Reference:

Cornelio, A. 2007. Viability study to implement peak load shaving at UCT Medical School. University of Cape Town.

Collections
Masters