Mohammad Taufik

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.

Multiple-Input Single-Output converter for renewable energy sources

This paper presents the design and simulation of Multiple-Input Single-Output (MISO) dc-dc converter. The main purpose of the converter is to allow connection of multiple power sources to a single dc bus system. Design and modeling of the MISO converter will first be discussed. Results of the computer simulation will be presented which demonstrate the ability of the converter to accept multiple dc sources while outputting only one dc voltage. Initial results from hardware testing will also be presented.

The DC House Project: Promoting the use of renewable energy for rural electrification

This paper presents the DC House Project to help boost the use of renewable energy sources for rural electrification. Different phases and projects involved in the DC House development will be described. Recent status, challenges encountered, short and long term outlook of the project will also be presented.

Small-scale wind energy harvesting using piezoelectric converter

This paper demonstrates the possibility of harvesting wind energy using piezoelectric material. The energy collected is made possible by a proposed new topology called the Stacked Buck converter. The new topology is derived from a standard buck topology but allows for sourcing from multiple inputs either independently or simultaneously. The purpose of this topology is to take advantage of several sources of energy harvesting using piezoelectric wind harvesting. The general transfer function for the new topology is derived and simulations for various cases to show proof of concept are presented. Results show the potential that the proposed topology offers for harvesting wind energy using piezoelectric. Initial hardware development will also be briefly presented.

Performance Analysis of Shunt Reactive Power Compensators

This paper offers comparative solutions for utility companies to solve the problem of voltage flicker in distribution systems. The solutions entail provision of shunt reactive compensation. Two solutions will be explored: the shunt capacitor and the Static VAR Compensator (SVC). Both solutions are modeled and simulated using PSCAD. Results will be compared by analyzing their performance when subjected to changes on the system, and problems that arise when connected to the system.

MODELING OF PARALLELED SERIES-LOADED-RESONANT CONVERTER WITH PHASE SHIFTING CONTROL

One topology widely known for use in high-voltage high-power converter in medical equipment is the Series Loaded Resonant (SLR) converter. As the power level required by medical equipment increases, there is a need to parallel the SLR converter for improved efficiency and performance. This paper presents the development of a circuit model for paralleled SLR converter to aid circuit designers evaluate circuit performance before the actual hardware is implemented. Each section of the circuit is modeled individually using sinusoidal approximation and circuit network methods. The derived model is then extended to include the parallel connection of the converter. The validity of the model is then tested by using computer simulation and hardware setup to demonstrate the converters switching waveforms, output voltage and efficiency. Results from both simulation and hardware show good agreement, which demonstrate the validity of the derived model and its usefulness in the initial design of the converter.

Modeling and Simulation of Multiple-Input Converter System with Equally Drawn Source Power

This paper presents the modeling of a proposed multiple input, single output converter system for use mainly to interface several renewable energy sources into a single load connection point. More specifically, modeling of a system involving ac and dc supplied to the multiple inputs, single output DC-DC converter will be described and then verified via simulation using OrCAD Pspice to exhibit its functionality. Results of the simulation of one model show the achievement of equally supplied source currents. Details of the modeling and the accompanying computer simulation of the proposed converter will be discussed.

Performance analysis of multiple input boost converter with inherent OR diode configuration

When integrating multiple sources to supply power to a single load, it is necessary to ensure that excess power available from a single source does not flow into the other sources. This is commonly done with OR diodes placed for each source being used. Despite its simplicity, this protection method suffers apparent efficiency loss through the diodes, especially when large current is involved. This paper discusses other and less intuitive consequences of using OR Diodes including distortion, system versatility, and cost in component sizing. Results of our study show that these consequences are largely resultant of unequal power sharing between the sources to power the load and are more prominent as the difference in presented input voltages increases.

Converting solar energy to electricity energy using diffractive and selective crystalline photonics

Currently, elctrical feasibility of product and its distribution services has more raised. Converting solar energy to electricity energy by use of photovoltaic cell (PV) is key element to get energy supply for our society profitable in the future. By using the rule of photonics is potentially promising to produce PV solar energy of semiconductor material that captures sunlight and changes its energy become DC electrical current. This technology gives advantage by resulting and storing this energy in PV cell structured that comes from a broadband range of sunlight spectral to improve its performance system such as to optimize the PV solar cell efficiency by using selectivity spectral crystalline photonic properties. We required to collect and store this sun energy that could be utilized any time and whenever this energy needed. Researcher at PVs field is brought up on problem how to increase this conversion process efficiency with cost as cheap as possible Selectivity spectral is the only methods to guide partly solar spectrum that is sorted for specific solar cell. It accords absorption of spectrum particular part by solar cell. Selectivity spectral can be reached by fluorescent concentrator and in photonics structured. Another selectivity spectral technique is angular confinement of the light trapping inside solar cell. On solar cell type with light propagation direction is always near normal direction. Then with change of normal light will give positive effect on internal path length, also ensues to increase absorption into solar cell. By using diffraction grating will add some diffraction order that influences to increase light path length. First, this causes to increase its absorption more than 74%. Second, it causes to raise generating on electricity charging and solar cell efficiency varied to 85%.

MULTIPHASE CHARGE PUMP FOR HIGH OUTPUT VOLTAGE

This paper proposes a multi-phase charge pump for high voltage output applications. The simple topology combines a voltage doubler with an inverting charge pump that are paralleled to provide an output voltage that is three times the input voltage. The operation of the proposed topology and the effects of multi-phasing and varying duty cycle on the input current ripple, output voltage and current ripple as well as total harmonic distortion are analyzed using LTSpice simulation. Benefits and issues from the proposed configuration will also be discussed.