In this paper a wireless charging drone was built and designed its charging pad for use in farming. The system will be designed to monitor the palms on the farm and record data on the crops yields and health by using photography or other sensors. The main aim of the system is to maximize crop yields and achieve the sustainable development goals (SDGs). Furthermore, the charging pads will be deployed throughout the farm in order for the drone to land whenever required to charge the battery during flight missions in order to increase their monitoring capabilities. Inductive coupling wireless charging is used for the transmitter and receiver of the circuit where the receiver coil is connected to the drone and the transmitter coil is attached to the pad, which receives power from an energy source.
Appropriate design of grounding of electrical power systems plays a crucial role in the protection of human life and electrical installations. One of the important aspects for grounding design is proper measurement of the impedance of the ground electrode system. The soil parameters, including electrical conductivity and permittivity exhibit a non-linear dependance on frequency. A single salt Na2SO4 electrolyte was used to emulate soil as conduction in soil predominantly occurs in multi-electrolyte. The complex impedance for two-terminal measurement consists of "bulk" (sample under the test) and electrode-electrolyte interface (EEI) impedances. Two-terminal electrochemical impedance spectroscopy measurements are conducted for the frequency range between 10 mHz to 2 MHz using Na2SO4 solutions with concentrations of 0.01 mM and 0.05 mM using stainless steel electrode. The circuit model of the electrolyte with EEI behavior is presented for a given frequency range. The circuit model shows a good agreement with measured impedance data.
In this paper, control strategies of multi-terminal high voltage dc transmission systems are compared focusing on their transient performance. After developing the small-signal model of the systems, the eigenvalue analysis method is used for comparison. Different operating conditions and parameter sizes are considered in the study. It is found that dc voltage droop control has a more stable operation than the master-slave control strategy over a wide range of operations.
Terahertz rectification has been a heavily investigated subject due to its utility in communication and energy harvesting potential. MIM diodes have been at the frontier terahertz rectification. As more and more materials are investigated to enhance MIM diodes performance, the unique electrical properties of carbon nanotubes coupled with its size makes it a possible candidate for micro and nanoscale devices such as MIM diodes. In this paper, the diode-like properties of single walled carbon nanotubes atop a metallic substrate with a thin native oxide layer in between are reported.
The purpose of this paper is to investigate the wireless transmission of power in an indoor environment using multiple transmitters. The project involves a MATLAB and ADS simulation of an indoor room with 4 horn antennae transmitting power at a frequency of 2.45 GHz and a power of 13 dBm. This power distribution profile is then compared to the profile obtained from a lab experiment using the same setup. The results indicate that the profile is highly dependent on the location of the transmitters as well as the occurrence of constructive and destructive interference. These are useful in the development of large-scale indoor wireless power transfer systems as they facilitate the concentration of power in a particular location where a device can be located.
This paper presents a non-parametric tuning rule design using the modified-relay feedback test (MRFT) for the DC-AC converters. The auto-tuning guarantees a specified phase margin for the system. PID controller parameters are calculated using the tuning rules derived from a numerical optimization process. Performance of the auto-tuned controller is studied by simulation, and is compared to the response of an optimal but non-auto-tuned controller.
This paper introduces a new approach to identify generator coherency for the use of damping control of inter area modes of oscillations in power systems. The low frequency oscillations become present after any type of disturbances in the network which is due to the imbalance in electrical and mechanical torque in the machines. This consequently limits the capabilities of the network to transmit power as well as degrade the stability of the grid. This paper proposes to use the concept of enhanced generator coherency identification using machine learning to aid the damping control of such oscillations using the MPC algorithm for the wide-area damping control (WADC).
The switch to renewable energy (RE) resources is dramatically rising in a bid to reduce the emission of greenhouse gasses. However, excessive penetration from renewable energy resources like solar and wind farms leads to problems in the grid as they are intermittent and characterized by chaotic behavior. Connecting energy storage systems and smoothing filters with RE resources can help to smooth out the power fluctuations. This paper solves the problems of the conventional smoothing techniques like low pass filter (LPF) and moving average (MA) as they generate charging power to the battery system in clear days which leads to battery overworking. The problem is solved by introducing moving median (MM) and Hampel filtering (HF). The simulated results show a good smoothing performance and less battery charge comparing to the classical methods.
The need for comfortable seats rises as individuals spend more time sitting to perform various activities, including the attendance of long flights. This study proposes a system that evaluates seat comfort at early design stages without the need for physical prototyping by integrating pressure mapping, motion capture, and modeling using Computer Aided Design (CAD) and Jack software. The system shall also help in setting the base of the most optimum comfort in a seat that can also be contained in an aircraft while allowing for a greater passenger capacity.
Air Conditioning (AC) system is indeed the most demanded power especially in the Middle East. The research is concentrated on having the Ice Thermal Energy Storage System (ITESS) as an efficient cooling system to sustain the load which can be operated by Solar Photovoltaic (PV). ITESS can make ice to build and store cooling during daytime and consume the ice at night time when there is no source of solar energy. The research starts by the analysis of electricity consumption for a building in Abu Dhabi City. Moreover, an economical study comparison between air-cooled chillers, water-cooled chillers (district cooling), and air-cooled chillers retrofitted with ice thermal storage are done to evaluate the systems. The literature reviews along with the data show that AC-ITES is sustainable, environmental, and cost-effective with few drawbacks; hence, can be used by residential or commercial buildings.
