Rosnazri Ali
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Preferred name
Rosnazri Ali
Official Name
Rosnazri, Ali
Alternative Name
Ali, R.
Ali, Rosnazri
Ali, R. B.
Main Affiliation
Scopus Author ID
36607475700
Researcher ID
EJL-9932-2022

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Microcontroller based MPPT solar charge controller

2021-07-21 , Nor Hanisah Baharudin , Tunku Muhammad Nizar Tunku Mansur , Cong T.L. , Sobri N.F.A. , Rosnazri Ali

This paper presents the Arduino Nano microcontroller based maximum power point tracking (MPPT) solar charge controller. The optimum solar photovoltaic power is extracted using the Perturb and Observe (P&O) MPPT algorithm. Whilst there are many MPPT solar charge controllers available in the market, the Arduino Nano based MPPT solar charge controller is an attractive method for MPPT controller due to its adaptability, simple, cheap, and durable with good performance for remote areas application with cheaper cost than conventional MPPT charge controllers. This system ensures maximum power is harvested from the photovoltaic panel and capable to charge the battery as well as maintain the battery health condition. This will increase the battery lifespan and increases the efficiency of the photovoltaic panel under varying solar insolations. In this paper, the Perturb and Observe (P&O) algorithm method is developed by using an Arduino Nano based MPPT controller for the photovoltaic generation system. The test result has shown the performance of the proposed controller is capable of tracking the photovoltaic maximum power point and extracting the optimum available power whilst charging the battery in the healthy mode.

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Selective Harmonic Elimination Pulse Width Modulation for Three-Phase Nine-Level Inverter Using Improved Whale Optimization Algorithm

2023-10-06 , Bimazlim M.A.S. , Baharuddin Ismail , Muhammad Zaid Aihsan , Rosnazri Ali , Talib M.H.N. , Muhammad Azhar Walter M.S. , Siti Khodijah Mazalan , Mohamad Nur Khairul Hafizi Rohani

For many years, multilevel inverter (MLI) is a system well-known for converting DC voltage to AC voltage which is suitable for energy resources conversion for industrial power sources. With the help of Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) switching technique, the output power from the MLI system is better efficiency with low Total Harmonics Distortion (THD). The SHEPWM switching technique is used to eliminate the lower order of the harmonics and reduces the Total Harmonics Distortion (THD) of the MLI system. Along with the optimization algorithms to solve difficult non-linear equations involving with SHEPWM, applying SHEPWM into MLI system helps to further improve the output power efficiency. Whale Optimization Algorithm (WOA) is one of the algorithms developed which capable of solving the non-linear equation and obtained suitable results for MLI. Additionally, many types of improvement done on WOA, called as Improved Whale Optimization Algorithms (IWOA) also developed to obtain better results compared with WOA. Developed in a MATLAB environment, a proposed IWOA is applied to solve the equation and compared with WOA. The results show that the proposed IWOA capable of achieving higher probability with fast convergence speed reaching global optimal compared to WOA. With the proposed approach, the IWOA efficiently computed required switching angles, to eliminate the selective lower-order harmonics for different modulation indices (Ma). In this paper, the proposed IWOA is performed on a three-phase nine-level cascaded H-bridge multilevel inverter (CHBMLI) for a wide range of modulation indexes between 0.1 until 1. The results show the eliminations of 5th, 7th, and 11th harmonics from the output of the three-phase nine-level MLI system thus reducing THD from the system up to 5.82%.

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Topologies of DC-DC converter in solar PV applications

2017-11-01 , Nor Hanisah Baharudin , Tunku Muhammad Nizar Tunku Mansur , Fairuz Abdul Hamid , Rosnazri Ali , Muhammad Irwanto Misrun

Solar energy plays an important role in renewable energy generation systems since it is clean, pollution-free sustainable energy as well as the increasing cost-of-electricity which causes high-growth demands amongst utility customers. This paper presents various circuit topologies of DC-DC converters in solar photovoltaic (PV) applications. There are three types of DC-DC converter presented in this paper that can be integrated with solar PV system which are buck, boost and buck-boost converter in various applications. This paper also presents the application on DC-DC converter in solar PV system for maximum power point tracking (MPPT) feature. The advantages and disadvantages of each topology will be discussed further in term of cost, components, efficiency and limitations.

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Harmonic Analysis of Three-Phase Asymmetrical Multilevel Inverter with Reduced Number of Switches

2021-01-01 , Muhammad Zaid Aihsan , Baharuddin Ismail , Rosnazri Ali , Wan Azani Wan Mustafa , Hasliza A Rahim @ Samsuddin , Abosinnee A.S.

This paper presents an analysis of a three-phase asymmetrical multilevel inverter towards resistive and inductive load testing. The asymmetrical multilevel inverter is chosen over the standard symmetrical multilevel inverter due to its circuit simplicity, cost-effectiveness and better performance as the topology offers a reduction in the number of switches and the improved Total Harmonic Distortion (THD). Whenever different levels of voltage are applied in an asymmetric cascaded H-bridge multilevel inverter, it will increase output voltage levels and reduces the harmonics. The selected topology is the cascaded H-bridge inverter with reduced number of switches and the modulation technique used in this paper intersects a single unit of a sine wave with three carrier signals to produce the PWM pulses for controlling the MOSFETs. The experiment was set up under a lab-scale and using the standard DC power supply. The experimental data for both resistive and inductive loads with modulation indexes of 0.7 and 0.9 are shown to verify the analysis. THD voltage and current are slightly higher for resistive loads than inductive loads. In addition, as the modulation index rises, the value of THD voltage and current decreases.

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