DC power is apparently attempting to breach into the power system-the system which it once lost to the AC power paradigm. DC is already present in the generation, transmission and utilization sides of the system, leaving distribution as the only area where it has not shown any significant presencethis may be regarded as still in research phase. The current work aims to investigate efficiency enhancement of a DC power distribution system for residential buildings via the use of a modular approach for the DC/DC solid state transformers (SSTs). Specifically, DC distribution system shows reduced efficiency at light loads because of the lowering in efficiency of its constituent SSTs. Via the use of modular approach, a single SST is composed of smaller modules which may be turned on or off individually, for the purpose of improving the converter efficiency. In this paper, we utilize two methods of load division upon SST converter modules. As the efficiency of an SST is increased, the overall efficiency of the system increases because bulk power passes through these transformers.
Photovoltaic (PV) system is a rapidly flourishing area for the implementation of renewable energy (RE) based power generation systems and their development is specifically owed to minimize the consumption of conventional fossil fuel thus minimizing immense emissions of harmful greenhouse gases. In order to harvest maximum power from PV arrays, MPPT techniques work in-cooperation with DC-DC converter. With the involvement of converter, two major issues rise: 1) convergence speed to detect the MPP as the sampling rate of PV system depends upon the converter system element parameters and 2) the stability of PV system under varying ambient conditions. Thus the designing of a DC-DC converter, gains a paramount importance. The research work in this paper revolves around the non-isolated boost converters. The averaging state-space model is utilized to derive the governing equations of the converter with respect to PV array and relations are provided to calculate the values of inductor, input capacitor and output capacitor. Several simulations are conducted in Matlab/Simulink and comparative analysis with the *(existing converter design) past-proposed converters have been presented. It has been proved that the performance of proposed DC-DC converter has superior performance.
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