Dirigibles have the ability to take off and land vertically, hover and maintain lift without consuming energy and can be easily deflated for packaging and transportation. As such, dirigibles are well suited for surveillance and surveyance missions such as rescue and aid operations after disasters. This paper reviews hybrid dirigible UAV design considerations and presents a novel hybrid power pl...

The paper is concerned with the control of the nonlinear plant using multiple models. The DR-300 servo is single-input/single-output model which consists of a permanent magnet DC motor connected via clutch to a permanent magnet DC generator. The servo is connected to the PC through the Advantech multifunction card and controlled using Matlab/Simulink environment. The nonlinear dynamical system ...

 Traditional high-frequency pulse width modulation (PWM) inverters for motor drives have several problems associated with their high frequency switching which produces high voltage change (dV/dt) rates. Multilevel inverters solve these problems because their devices switch at the fundamental frequency. Two different multilevel topologies are identified for use as a converter for electric drive...

The wind energy is free, inexhaustible and it produces no waste or greenhouse gases. Furthermore, it is a good method of supplying energy to remote areas. With growing application of wind energy conversion systems (WECSs), various technologies are developed for them. Squirrel cage induction motors are the most commonly used electrical machine in AC drives. In this paper, a new wind energy conve...

Ramp-signal generators are particularly critical in controlling the frequency and dutycycle of pulse-width modulated (PWM) switching supplies. They are normally implemented with a timed charging current source into a capacitor and a reset switch controlled by two comparators whose reference signals set the lower and upper limits of the ramp. A fast comparator is required to ensure the reset ope...

DC motor widely used-high precision digital controls. Speed control of dc motor is achieved with smooth starter by using buck converter. Hard switching causes unsatisfactory dynamic behaviour produces abrupt variations in the V & I of the motor overcome by dc-dc buck power converter by PI controller. A separately excited dc motor is used for this simulation. The proposed system with PI control ...

Kebutuhan akan energi listrik saat ini semakin meningkat sehingga menjadi sumber utama yang paling penting. Salah satu upaya untuk memenuhi kebutuhan tersebut dikembangkan Pembangkit Listrik Tenaga Piko Hidro (PLTPH) dengan turbin archimedes screw bilah lima. Dalam pengembangannya dilakukan uji performa generator magnet permanen AC 3 phase kapasitas daya sebesar 500 Watt. Tujuan dari pengujian ...

Bangladesh is a land of rivers, canals, and lakes where water transportation an essential means transport. The country use boats as one the leading resources carrier in its widespread inland waterways. Most currently used only diesel for fuel. Appropriate renewable energy sources, particularly solar with generators, could reduce consumption. In this paper, typical boat requirement was calculate...