Abstract
This paper presents coordinated operation of power management strategies for a hybrid system. This hybrid system is modeled based on dynamic variation of load power and its effective distribution strategy. The proposed hybrid system consists of variable speed diesel generator (VSDG) and lithium-ion battery which is able to supply electric power for Power, Water and Communication (PWC) economically and efficiently in rural areas. The variation of power demand in PWC load is highlighted in load profile. The total PWC load is effectively shared by two VSDGs and one Lithium-Ion battery bank. The use of advanced VSDG helps hybrid system to reduce fuel consumption as its speed varies with load demand. The proposed segmentation of high frequency and low frequency components of load currents and their assignation to suitable source helps to reduce the transients during load variations. Also, one of the generators will be switched off when the total power demand goes below specified level and hence significant fuel savings can be achieved. The execution of proposed system is assessed through MATLAB/Simulink model and its validation by experimental test bench.
Highlights
The main concern of people living in rural areas in all over globe about the power requirement for their essential needs like Power, Water and Communications [1]
Ich represents load currents, the currents from VSDG1 and VSDG2 are indicated by Ired1 and Ired2 respectively
The battery current fed in to dc bus through a DC/DC converter is shown by Ibus-bat
Summary
The main concern of people living in rural areas in all over globe about the power requirement for their essential needs like Power, Water and Communications [1]. For reliable power supply, the constant speed diesel generator (CSDG) is most popular. The main issue of this conventional system is that it will run at constant speed irrespective of load variations. The hybrid operation executed with two VSDGs and one Lithium-ion battery are connected to a common dc bus. The power management is executed in such a way that the principal part of load is supplied by two VSDGs and keeps the voltage of dc bus in desired level. In addition for supplying power to PWC system, the main concern of this paper is concentrated on the power mitigation of power fluctuations due to transients during load variations with help of energy storage system. One of the VSDG is tured off when the total power demand goes below specified level and the fuel efficeincy can be improved
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