Mohamad Zhafran Zakariya
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Preferred name
Mohamad Zhafran Zakariya
Official Name
Mohamad Zhafran , Zakariya
Alternative Name
Zakariya, M. Z.
Main Affiliation
Scopus Author ID
57214778495
Researcher ID
EIN-5517-2022

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Publication

A Systematic Review on Cascading Failures Models in Renewable Power Systems with Dynamics Perspective and Protections Modeling

2023-01-15 , Mohamad Zhafran Zakariya , Teh J.

Cascading failure in renewable power systems is a hot topic that attracts most researchers worldwide. This paper discusses the phenomena of blackout and cascading failure in terms of definition, causes, and past events worldwide. This paper also compares the models in terms of features, limitations, computational speed, and test bus for assisting the tradeoff analysis. Benchmarking among the models and potential test buses to be utilized for cascading failure analysis considering the high penetration of renewable power systems, are also included in this paper. The authors propose tradeoffs between the existing cascading failure models and solutions to achieve high accuracy and reduce computational complexity. Furthermore, this paper also compares the statics versus dynamics model methodology and the parameters involved during the simulation, corresponding to the latest challenges in protection systems. This paper also discusses the emerging challenges of cascading failure with an emphasis on the aspect of dynamic models, renewable energy, and the reliability of power systems. Due to the emerging problems that arise with the high penetration of renewable energy, grid-forming technology is the solution to study the impact of renewable energy on cascading failure. Researchers must develop a sophisticated dynamic model with high-speed computational time to realize online monitoring, prediction, and mitigation of blackouts becomes possible.

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Publication

Piezoelectric Array Configuration Technique into Enhance Power Catchment for Sound Energy Harvester System

2020-11-18 , Liew Hui Fang , Rosemizi Abd Rahim , Muhammad Izuan Fahmi Romli , Mohamad Zhafran Zakariya , Junaidah Ali Mohd Jobran , Norhanisa Kimpol

The objective of this study is to explore the harvest maximum output changes occurs in piezoelectric transducer when connected in different configuration to produce highest electricity consumption and generate sound energy harvesting system. Acoustic energy is a type of environmental energy source that can be extracted and converted into electrical energy for small-scale energy applications. In this study, the corresponding load resistance for single piezoelectric transducer is 4.5 k$\Omega$, together with a constant vibration source at a frequency of 68 Hz and a 1-g acceleration. The performance of output voltage and power of piezoelectric are evaluated and the optimum output is measured by depending on the connection of the piezoelectric transducer arrangement into series, parallel and series, and parallel which stimulated using Proteus software. The experiment result presented that, when have single piezo, 5 piezo connected in series, and 5 piezo connected in parallel, the output powers are 1.664 mW, 1.671mW and 7.676 mW, respectively. During the combination series and parallel connections, the output power of 3S1P piezo increases to 5.05mW. In a parallel configuration, the output voltage that produced is much higher than a piezoelectric transducer arrangement connected in series connection. The piezoelectric transducer that connected in parallel configurations increases its voltage output from 2.83 V to 13.05 V with the same polarity. The arrangement of piezoelectric transducer in parallel configuration is affordable, with its higher production of a higher power output compared to the arrangement of piezoelectric transducer in series connection. Whereas in terms of power output, the maximum power remains constant in the range of 1.665 to 1.671 mW when three transducers are in series configuration connection with the same polarity. In conclusion, the proper implementation of the piezoelectric array configuration is needed in order to operate the minimum energy for low load devices and promise to accomplish generated optimum power output in harvester system.

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