Page 520 - AWSAR 2.0

496 || AWSAR Awarded Popular Science Stories - 2019
make some important connections as well as pursue necessary professional skills and foster personal development. During my master’s programme, I integrated the renewable energy (wind energy) source with the utility grid (a type of electrical power distribution system) with the help of power electronics converters. After getting a silver medal in this programme, I became acquainted with the knowledge regarding the generation of lots of power quality (PQ) disturbances due to all such renewable energy sources and power electronics converters. Any deviation in voltage, current, and frequency from its normal value, causing mal-operation of customer’s equipment, is known as PQ disturbance. Everywhere, we are surrounded by a lot of signals such as communication signals, vibrational signals, music, medical images, PQ disturbance signals, etc., which need to be analysed. With this growing passion for my subject, I decided to utilize
my time to explore some important discoveries within this field. Therefore, I joined Ph.D. programme in 2017 and I received an opportunity to continue my research in the same field. My Ph.D. research work is completely focused on the assessment of several PQ disturbances in a power distribution network.
In the modern era, electric
power is the backbone of
commerce and industries.
The appropriate amount of
PQ is required in the power
distribution network due to the
enormous usage of non-linear industrial as well as domestic loads. The poor PQ is causing the nuisance tripping of protective devices, overloaded neutrals, data network congestion, computer lockups and flickering screens. It
not only has a significant economic impact on the highly sensitive industrial facilities but also reduces the lifespan of the equipment. The poor PQ is forcing the equipment manufacturers to design compatible equipment with the corrupted power system and is causing several PQ disturbances.
In a power distribution system, if only one disturbance is present at a time, then it is known as single-stage PQ disturbance, for example voltage sag, interruption, notch, flicker, transient, etc. The superimposition of more than one type of PQ disturbances during the same period corresponds to multiple PQ disturbances, for example voltage sag with flicker,voltageswellwithharmonics,transient with harmonics, flicker with harmonics, etc. In contrast, multi-stage PQ disturbances are defined as the single-stage PQ disturbance followed by some other PQ disturbances before the recovery of the former disturbance, for
example voltage sag followed by swell, voltage swell followed by sag, transient followed by sag, transient followed by the swell, etc. Therefore, the assessment and identification of these PQ disturbances are the need of the day for all the energy-intensive sites. Therefore, to maintain PQ within the permissible levels, accurate monitoring of the PQ is the crucial step in recognizing the type of PQ disturbances as well as underlying causes responsible for these disturbances. It will help the system engineers to solve the
problems of the consumers by suggesting the mitigating devices to avoid the failure of sensitive facilities.
Several state-of-the-art digital signal processing (DSP) techniques have been
Any deviation in voltage, current, and frequency from its normal value, causing mal-operation of customer’s equipment, is known as PQ disturbance. Everywhere, we are surrounded by a lot of signals such as communication signals, vibrational signals, music, medical images, PQ disturbance signals, etc., which need to be analysed.