Makbul Anwari

Modeling and Simulation of Photovoltaic Water Pumping System

This paper presents modeling of a simple but efficient photovoltaic water pumping system. The system employs maximum power point tracker (MPPT). Two MPPT algorithms, subsystems and control methods will be modeled and simulated using Matlab and Simulink with actual irradiance data. Simulation results will be presented in terms of performance parameters such as total energy produced and total volume of water pumped per day. The results further validate that MPPT can significantly improve efficiency and performance of PV water pumping system compared to the system without MPPT.

New Unbalance Factor for Estimating Performance of a Three-Phase Induction Motor With Under- and Overvoltage Unbalance

This paper evaluates the influence of the unbalance factors in calculating total copper losses, efficiency, power factor, input power, output torque, peak currents, and derating factor of the motor operating under unbalanced voltage system. The complete definition for the voltage unbalance is using complex voltage-unbalance factor that consists of its magnitude and angle. A coefficient to determine either under- or over-unbalance conditions is inserted. The analysis of the motor is performed using the method of symmetrical component, and MATLAB software is used to investigate the performance of the induction motor. The simulation results show that the International Electrotechnical Commission definition of the voltage unbalance combined with the coefficient of unbalance condition can be applied to evaluate total copper losses, input power, power factor, and total output torque precisely. However, the phase angle of the unbalance factor must be included for accurate prediction of peak current and peak copper losses of the phase windings and derating factor of the motor.

Analysis and simulations of Z-source inverter control methods

In this paper, two different control methods for Z-source inverter are examined. The Simple Boost and the Maximum Boost control methods of the inverter are analyzed and compared each other using simulation with MATLAB/Simulink. The Simple Boost control with independence relation between modulation index and shoot-through duty ratio is also simulated and analyzed. The selection of high modulation index and shoot-through duty ratio can reduce the inverters dc link voltage overshoot and increasing power delivery capacity of the inverter.

A parallel energy-sharing control for fuel cell-battery-ultracapacitor hybrid vehicle

This paper proposes a parallel energy-sharing control for fuel cell hybrid vehicles (FCHVs) application. The hybrid source consists of fuel cells (FCs) stack, battery packs and Ultracapacitor (UC) modules. In the proposed parallel energy sharing control, each source is connected to a DC bus via power electronics converters. A total of six control loops are applied in the supervisory system in order to regulate the DC bus voltage, control of power flow and at the same time to monitor the state of charge (SOC) of each energy storage device. Simulation with experiment verifications are carried out to verify the proposed energy control system.

An evaluation of hybrid wind/diesel energy potential in Pemanggil Island Malaysia

This paper analyzed the potential implementation of renewable hybrid wind/diesel energy system in Pemanggil Island, Malaysia. National Renewable Energy Laboratorys (NREL) HOMER software was used to perform the techno economic feasibility of hybrid wind/diesel energy system. The investigation demonstrated the impact of wind penetration and battery storage on energy production, cost of energy and number of operational hours of diesel generators for the given hybrid configurations. Emphasis has also been placed on percentage fuel savings and reduction in carbon emissions of different hybrid systems. At the end of this paper, suitability of utilizing hybrid wind/diesel energy system over standalone diesel system was discussed mainly based on different wind irradiances and diesel prices.

Dynamic evolution control of interleaved boost dc-dc converter for Fuel Cell application

An electric vehicle powered by the fuel cells called Fuel Cell Electric Vehicles has higher efficiency and lower emissions compared with the internal combustion engine vehicles. In this application, a high power boost dc-dc converter is adopted to adjust the output voltage, current and power of fuel cell engine to meet the vehicle requirements. The major challenge of designing a boost converter for high power application is how to handle the high current at the input and high voltage at the output. In this paper an interleaved boost dc-dc converter is proposed for stepping-up the voltage on high power application. The controller of converter system was designed. A new approach for interleaved boost converter controller based on dynamic evolution control theory is presented. Performance of the interleaved boost converter with the proposed dynamic evolution controller is tested through simulation.

A simple PEM fuel cell emulator using electrical circuit model

This paper presents the development of a simple emulator for proton exchange membrane (PEM) fuel cell. This emulator is built based on the dynamic model of PEM fuel cells using electrical circuits. The electrical circuit model has been modeled in Matlab Simulink environments. The double-layer charging effect characteristic inside the fuel cell is included in the models. The steady-state and transient response of the model is investigated. Emulator performance is validated using experimental data from a 500-W commercial PEM fuel-cell stack. The emulator could be used in PEM fuel-cell control related studies.

Performance study of Series Loaded Resonant converter using super barrier rectifiers

In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series Loaded Resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is being used. The design of SLR, results from computer simulations, and hardware measurements will be discussed. The efficiency measurements from all conduction modes in SLR using three types of diodes (pn, schottky, and SBR) will be presented along with transient study of one of SLRs continuous conduction mode.

Three-Dimensional Analyses of an MHD Accelerator

This paper describes the results of three-dimensional numerical simulation on MHD accelerator. The main stress falls on the comprehension of three-dimensional phenomena. As a result of this study, we found that local Hall current is enhanced under the high Hall parameter condition on Faraday type accelerator. This local Hall current promotes the Joule dissipation and induces the secondary flow. In Diagonal type accelerator, the Faraday current exists in upstream region effectively. It is quiet in downstream region in contrast. Also it is important that Diagonal system could obtain almost the same acceleration performance to Faraday case in Hall current neutralized condition. We found that transforming to generator mode occurs easily in upstream region according to decreased diagonal angle. It is serviceable that we could possess qualitative view about threedimensional behavior in MHD accelerator.

Single-Phase Photovoltaic-Inverter Operation Characteristic in Distributed Generation System

Single-phase grid tied inverter is one among types of inverters widely used in photovoltaic (PV) generation system due to the advantages they offer. This chapter describes model and simulation of such inverter in operation as distributed generation in electrical power system. Power characteristics including power quality, grid interaction behavior and load sharing that are important aspects in their operation as grid connected inverter will be simulated and analyzed. The role of current or voltage control and associated mechanism in photovoltaic inverter such as photovoltaic I-V characteristic, maximum power point tracker (MPPT), and other mechanism that involves in power flow and load sharing control are described. Further, some observation and measurement from a 5-kWp laboratory scale grid interconnected photovoltaic plant that employ single phase photovoltaic inverter will be presented. The load sharing behavior between photovoltaic plant and utility grid during supplying both linear and non linear load that connected on their point of common coupling. In addition, observation and measurement results of power quality parameter behavior during photovoltaic inverter operation along extremely density variation of photovoltaic produced energy that comes from the atmospheric condition will be presented.