Musse Mohamud Ahmed

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IEEE 802.15.4 standard provides a low cost, low power wireless sensor network solution for smart grid communication networks. This standard uses slotted Carrier Sense Multiple Access-Collision Avoidance (CSMA-CA) with binary exponential back off algorithm (BEB) to avoid collision between the sensor nodes. However, BEB does not consider the traffic(More)
This paper proposes a new supervisory control and data acquisition (SCADA) based fault isolation system on the low voltage (415/240 V) distribution system. It presents a customized distribution automation system (DAS) for automatic operation and secure fault isolation tested in the Malaysian utility distribution system; Tenaga Nasional Berhad (TNB)(More)
Transducers have found wide applications in industries, though, they possess nonlinear responses. The nonlinearity feature does not prevail over the entire range; rather there are sections (or regions) on the response curves that are easily regarded as linear. This work focuses on analyzing transducer characteristics by finding regions exhibiting larger(More)
This paper presents a single-phase Grid-tied inverter for renewable energy systems, which can be used for obtaining small-voltage AC supply for powering small electronic devices or can be used in a distributed grid system for utility supply. The issue of synchronization of these DC-AC inverters with the grid/utility systems is explained and investigated(More)
This paper presents the simulation details of a single-phase 50Hz inverter that could be used for obtaining small-voltage AC or DC supply source needed for powering small electronic devices that could be employed for distributed measurement in monitoring systems. Energy harvesting from solar presents a source that may prove viable alternative to(More)
This paper gives in simulation details the effect of switching sequence generation (PWM) on the ultimate wave-shape of the sinusoidal output produced from a constant voltage assumed to be from solar generation. The circuit, consisting of inductive elements, is associated with the issue of fly-back spikes generation when the circuit is switching circuit. The(More)
Multiple Input Multiple Output (2x2MIMO) patch antenna for multiband applications has been proposed in this paper. The proposed design has reduced the mutual coupling and enhance the bandwidth and efficiency. The proposed 2x2 MIMO patch antenna is simulated using Computer Simulation Technology (CST). The isolation, bandwidth and efficiency are enhanced by(More)
This paper describes the development of a solid-state fault current limiting and interrupting device (FCLID) suitable for low-voltage distribution networks. The main components of the FCLID are a bidirectional semiconductor switch that can disrupt the short-circuit current, and a voltage clamping element that helps to control the current and absorb the(More)
Satellite to earth links operating at Ku, Ka, and V bands are strongly attenuated by rain. Rain attenuation is the most significant parameter which degrades the performance of the links. Hence, it is essential for satellite link designer to take into account rain fade prediction accurately before system implementation. Rain rate is the main parameter to(More)
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