Investigate the effect of harmonics on high voltage regulators

Charan, Vikash Sikendra (2018) Investigate the effect of harmonics on high voltage regulators. [USQ Project]


The growing number of micro embedded generation installed on the grid, has created a challenge for network distribution companies to maintain the voltage within the statutory limits. Ergon Energy has received numerous complaints from customers where the appliances and equipment are failing prematurely and solar PV inverters are tripping off. This is due to the increase in voltage on the 415/240V grid network.

An investigation was conducted on the high voltage complaint and it was discovered that the automatic voltage regulators (AVR) input voltage was affected by harmonics. The AVR have input voltage supplied by volts to milliamp transducer. Upon testing the transducer with Doble power simulator showed that transducer being affected by harmonics. After some harmonic analysis on 11kV grid supply, the result showed that 5 th and 7th harmonics was more dominant in the spectrum.

Two other AVRs, currently used in distribution network were also tested with harmonics injection. The results showed that the solid state electronic AVR was affected whereas microprocessor based AVR was not affected. The microprocessor based AVR can analyse up to 15th harmonics in the microcontroller.

A Solar inverter was also analysed as it has the capability to regulate voltage. The inverters generate high frequency harmonics and distort the current waveform that makes it difficult to detect zero crossing. Some of the analysis of the inverter voltage and current waveform has been discussed in results discussion.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Supervisors: Wen, Paul
Qualification: Bachelor of Engineering (Honors) (Electrical and Electronic)
Date Deposited: 08 Sep 2021 05:03
Last Modified: 27 Jun 2023 04:52

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