Design and implementation of a demand-dependent switching algorithm for dynamic load in a stand-alone photovoltaic system

Date

7-2016

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Electronics Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Adrian Augusto M. Sumalde

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The research presented a microcontroller-based control strategy that changes the series-parellel configuration of a battery bank in a stand-alone photovoltaic system based on the load demand as a specified time. The designed switching algorithm reconfigures battery interconnection to limit the total discharge current and matches the overall battery capacity to the load demand. A switching matrix was implemented to provide a way for the microcontroller to control battery interconnection to limit the total discharge current and matched the overall battery capacity to the load demand. A switching matrix was implemented to provide a way for the microcontroller to control battery connections at 2(n-1) number of relays, where n is the number of batteries. The implemented control system hardware consists of a current sensor, microcontroller and relay modules. The hardware was connected to a programmable DC Load and six solar batteries for the experiment. The outputs of the switching algorithm were checked using the constant-current mode of a DC electronic load. Current values were varied from 0.1A A to 2.4 A to simulate power demand values of 1.2 W to 28.8 W. The conditions of the designed algorithm caused a different output configuration for current values 0.4 A to 1.8 A, depending on whether the power demand was increased or decreased. Expected and actual reconfiguration values were compared using paired T-test statistical analysis anf the results showed that the switching algorithm switches the relays according to set conditions. Additional evaluation on the switching algorithm can be conducted to further support the study.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2016 E64 /A53

Document Type

Thesis

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