Norkharziana Mohd Nayan
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Norkharziana Mohd Nayan
Official Name
Norkharziana, Mohd Nayan
Alternative Name
Nayan, Norkharziana Mohd
Nayan, M. N.
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Scopus Author ID
54791103800

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  • Publication
    The effect of semi-conductive and non-conductive nano particles in sunflower oil based insulation
    ( 2020-01-07)
    Nuriziani Hussin
    ;
    Kwong Yeaw L.
    ;
    Ahmad Nabil Mohd Khalil
    ;
    Kamarol Mohd Jamil M.
    ;
    Norkharziana Mohd Nayan
    ;
    Syahrun Nizam Md Arshad @ Hashim
    ;
    Ainanie Azizie N.
    Following the improvement of technology, more and more alternatives are introduced to improve the insulation material and one of them is the nanotechnology. Research had been done which confirm the enhancement of the transformer oil upon adding nanoparticles in term of dielectric strength, viscosity, relative permittivity and others. In this research, semi-conductive (ZnO) and non-conductive (ZrO2) nanoparticles with weigh to volume ratio of 0.05g/l are added to the sunflower oil based insulation and the effects are observed. The relative permittivity of added ZnO is higher compare to ZrO2 in mineral oil. The situation is opposite as ZrO2 yield higher permittivity with sunflower oil. In term of breakdown voltage, the addition of ZnO shows a better dielectric strength compare to ZrO2. The kinematic viscosity is also increase when both nanoparticles are added in which ZnO contributes a higher value.
  • Publication
    The simulation analysis of piezoelectric transducer with multi-array configuration
    ( 2020-01-07)
    Ahmad Kamil Zainal Abidin N.
    ;
    Norkharziana Mohd Nayan
    ;
    Azizan, Muhammad Mokhzaini
    ;
    Azuwa Ali
    ;
    Nuriziani Hussin
    ;
    Azli N.A.
    ;
    Nordin N.M.
    Low frequency energy harvesting using piezoelectric is one of promising method on harvesting energy from a free source. This method offered powering low load and remote device application. However, due to its nature which is inconsistency in providing the magnitude of input, specifically in low frequency harvesting, better solution to stable up and increase the converted output is explored widely. There are a few parameter that influences in the piezoelectric output generation. These parameter includes the type of piezoelectric, piezoelectric array configuration, AC-DC converter and etc. The types of the piezoelectric used in this project are the circular piezoelectric. When there is a force (motion) exerted on the piezoelectric disk, electrical charge was produced which initiated the energy conversion. In this research, the configuration of array connection for piezoelectric were investigated. The system is tested with different load configuration in a range of 10 kΩ to 1 MΩ. The design and development of the piezoelectric array variant were series (S), parallel(P), series parallel (SP) and parallel-series (PS). The observation emphasized on finding the best types of piezoelectric array configuration in producing optimum output of the harvested power. The simulation part consists of designing, simulating and analysing the result are done by using PSIM software. For validation of the simulation result, the implementation design of the hardware prototype that supplies pressure to piezoelectric have been done. In conclusion, a proper implementation of piezoelectric array configuration will produce optimum power output which can fulfil the minimum requirement of energy for powering low load device.
  • Publication
    Multiple switching pattern for a modified reduce switch multilevel inverter: A comparison analysis
    ( 2020-01-07)
    Mohd Hafiz Arshad
    ;
    Siti Khodijah Mazalan
    ;
    Nor Ashbahani Mohamad Kajaan
    ;
    Norkharziana Mohd Nayan
    ;
    Zainuddin Mat Isa
    ;
    Baharuddin Ismail
    ;
    Izati Abdullah N.
    A primary concern of multilevel inverter is its capability to produce desired alternating voltage close to sinusoidal at the output, using multiple sources of DC voltage input. Mostly a multilevel inverter is used to generate the AC voltage from DC voltage. The aim of this paper is to investigate the output of 9 level multilevel inverter by modifying the conventional 5 levels H-bridge cascade multilevel inverter. The proposed design intending to reduce the number of switches from 16 switches to 10 switches. Implementation of different switching pattern methods; equal phase (EP), half equal phase (HEP), half height (HH) and feed forward (FF) and the related expression are presented in this paper. In the result section shows a different percentage of total harmonic distortion achieved. Out of all 4 methods, HH method suppressed distortion wave the most and resulted in the lowest THD in the proposed inverter. This paper shows that by reducing the number of switches in multilevel inverter structure maintains the same quality output as the conventional H-bridge topology. Furthermore, the manipulation of the switches firing angle contribute in decreasing the system THD.
  • Publication
    A Dragonfly Algorithm Application: Optimizing Solar Cell Single Diode Model Parameters
    ( 2020-01-07)
    Zainuddin Mat Isa
    ;
    Norkharziana Mohd Nayan
    ;
    Nor Ashbahani Mohamad Kajaan
    ;
    Mohd Hafiz Arshad
    This paper provides an overview of optimizing solar cell single diode parameters using Dragonfly Algorithm. The 57 mm diameter commercial (R.T.C. France) silicon solar cell measurement data are taking as the data source for the optimization process. The results produced are compared with NM-PSO and IJAYA algorithms to observe the efficiency, accuracy and reliability of the proposed approach.
  • Publication
    Performances of Multi-Configuration Piezoelectric Connection with AC-DC Converter in Low Frequency Energy Harvesting System
    ( 2023-01-01)
    Abidin N.A.K.Z.
    ;
    Norkharziana Mohd Nayan
    ;
    Azizan M.M.
    ;
    Nursabirah Jamel
    ;
    Azuwa Ali
    ;
    Azli N.A.
    ;
    Nordin N.M.
    Harvesting energy by capturing vibration from low frequency energy have been explored extensively. In essence, a single piezoelectric transducer or an array of piezoelectric connections are used to convert kinetic energy into electrical energy in order to produce low frequency energy. In this paper, multi-configuration array piezoelectric connections are used to investigate the performances of different converter circuit types in low energy harvesting applications. This research utilized three pieces of circular piezoelectric sensor to test the combinations of array connection. There are four options for the piezoelectric sensor configuration: parallel (P), series (S), parallel-series (PS), and series-parallel (SP) while the full wave bridge rectifier (FWBR), parallel voltage multiplier (PVM), and parallel Synchronized Switch Harvesting on Inductor (P-SSHI) converter circuit are chosen AC-DC converter circuits. The system is assessed using a variety of load configurations, including 10 kω and 1 Mω with a 3 Hz input frequency. In order to produce the highest possible output of collected power, the observation focuses on identifying the ideal combination of array piezoelectric connections with AC-DC converter. The result shows that 3-Parallel (3P) piezoelectric connection obtained a higher power output among the other types of array piezoelectric which was 5.97μW. The FWBR circuit generated the highest output power with 2.42μW for a combination of piezoelectric sensors array of 3P connection with the AC-DC converter.
  • Publication
    THD analysis for symmetrical five level and seven level cascaded multilevel inverter
    ( 2020-01-07)
    Kaja Mohideen
    ;
    Nor Ashbahani Mohamad Kajaan
    ;
    Zainuddin Mat Isa
    ;
    Norkharziana Mohd Nayan
    ;
    Mohd Hafiz Arshad
    ;
    Saidatul Shema Saad
    Total Harmonic Distortion (THD) is one of the problems in the multilevel inverter. This paper discussed a brief review of THD in different cascaded H-bridge multilevel inverter topologies of five levels and seven levels at the output waveforms. The five levels inverter contains eight switches while seven levels inverter used twelve switches. Each single H-bridge inverter circuit is fed by equally independent DC source for both inverters. The inverter uses MOSFET as the switching point and acts as the controller for a fundamental switching operation. The switching value has been set at the gating block to control the operation of the MOSFET switching. Several waveforms and simulation findings are provided to validate the quality of the proposed topology.