The increased growth of Global System for Mobile Communication (GSM) networks is not without challenges such as dropped or blocked calls, poor internet access, occasional service outages, and network congestions among other poor service challenges. This paper investigated and analysed the performance of GSM networks for optimization of Quality of Service (QoS) at Malete, Kwara State. Due to the inability to make calls, poor data service, network congestions, etc., 2G, 3G and 4G drive test analyses were conducted and a questionnaire method was adopted to compare customer feedbacks with the test results. Key Performance Indicators (KPI) and parameters such as Call Setup Success Rate (CSSR), Call Completion Rate (CCR), Call Drop Rate (CDR), and Call Handover Success Rate (CHSR) were considered and investigated. The data collected through Test Mobile System (TEMS) software were analyzed using map info professional to identify the cause of these problems with a view to providing efficient and effective solutions to the problems. Destitute network and QoS performance were encountered in some parts of the research area and parametric optimization was given as a way of improving the network performance for better QoS, reception, revenue generation and economic growth.

Fluctuations in system voltage can disrupt the system possessions both at the utility and customer end. Such a problem is most prominent at a point where a renewable source is attached to feed the grid. Photovoltaic (PV) power is one of the proposing renewable resources in the twenty-one century. However, its output depends on sunlight which varies throughout the day. This varying output of grid-connected PV systems causes harmonics and variation in system voltage. This work proposes a model of Dynamic Voltage Restorer (DVR) to overcome the issues mentioned above. DVR is a three-phase voltage source inverter (VSI) fed by a DC source. Adaptive neuro-fuzzy inference system(ANFIS) controller along with synchronous reference frame theory (SRF) is used to control the switching of voltage source inverter. According to SRF theory, three-phase a–b–c stationary frames are changed into 0–d-q rotational frames. The 0–d–q rotating frame reference signals are regulated using a PI or ANFIS controller to achieve the necessary reference signals. The measured amplitudes of the reference phase voltages are used directly to calculate the PWM signal generation for the three-phase inverter. MATLAB software is used to implement the proposed model and verify the proposed controller. The DVR is attached to a grid integrated with the PV system. PV system parameters like irradiance and temperature are varied to disturb the voltage. Voltage fluctuations and harmonics generated were mitigated by DVR. The results show that the proposed device can improve the voltage profile of a PV-integrated grid.

The switching mode DC- DC was extensively researched and developed to meet most industrial power electronics requirements. Using the switch mode has the advantage of reducing conductive and switching losses by increasing the switching frequency. In addition, the power converters structure includes energy storage components, and power switches that reduce their performance. The development of new typologies for the power converters was undertaken in parallel with the advancement of instruments, materials, and control systems technology. By minimizing the switching losses and the overall converter size, these typologies may provide high performance. This study will therefore reflect on the classifications of DC- DC converters, and their ability to operate at high switching frequencies. Also, the control methods of the DC- DC converters will be discussed and compared. This project includes an intensive comparison between different typologies of DC-DC converters by using Matlab/ Simulink software to implement the frequency controlfor the most two effective typologies.

Nowadays, a multilevel inverter is one of the important devices that provides a practical approach device in power system industries because of its features which are less switching losses, lower electromagnetic interference, reduced harmonic distortion, higher DC link voltages, and improved output voltage and current waveforms. Among all existed multilevel inverter, cascaded H-bridge multilevel inverter is the most attractive because of the technology development with megawatt power level. So, the cascaded H-bridge multilevel inverter has been tested and proven as a suitable DC/AC device for medium and high power applications such as renewable energy systems, electric vehicles, and motor drive applications. In this paper, the project is focusing on the combination of a nine-level cascaded H-bridge multilevel inverter connected to photovoltaic (PV) sources and a hybrid powerfilter. This project aims to study and to analyze the results of the proposed system. Thebehaviour and the performance of the designed system have shown that the system offered330V peak output AC voltage with an efficiency of 93.96% and a 5% reduction of THD.This project will be carried out only in Matlab/Simulink software.

Wireless power transmission (WPT) is the method that transferring electrical energy from power source to electrical without any physical contact and it can be used to transfer power to electricity dependent systems or devices. In WPT, electromagnetic energy is produced to transmit the energy from power source (transmitter) to the load (receiver) via resonant inductive coupling. This article focuses on the design of a resonant inductive coupling using parallel-T topology in coupling WTR and combined of single transmitter with multiple receivers. In addition, principle of magnetic wave between the transmitter and receiver with related parameters is utilized to develop in WPT. A parallel-T topology that consists of T-matching network for secondary side is proposed as it is more suitable for weak coupling wireless power transfer applications. Besides that, three circuits are designed to show the resonant inductive coupling for WTP which including the circuit with and without matching network and the circuit of single transmitter with multiple receivers. The simulation of output voltage and output current are observed to relate the effects of frequency on the circuit. The graph of output voltage and power are plotted to show the pattern on effect of the frequencies to the resonant inductive coupling circuit.

This paper reviews the development of demand response (DR) and dynamic thermal rating (DTR) system for enhancing the operation and reliability of power system. The advantages and prospect of the DR program are discussed. The case for DTR system is established by comparing it against the traditional static thermal rating (STR) system. Various line monitoring methods and devices required for the implementation of the DTR system are presented. The challenges for deploying the DTR system from the perspective of selecting appropriate transmission lines for DTR deployment, identifying critical spans for deploying DTR sensors, managing the reliability of the DTR system, and the integration of the DTR system with existing and future power systems are discussed. Finally, the two main standards governing the operation of the DTR system, namely the IEEE 738 standard and the CIGRE standard are compared to elucidate the employability of the DTR system.

The role and purpose of this new International Journal of Energy and Power Systems are elucidated.