Regulated DC-DC converter for grid connected system during hazardous conditions

Abstract

The solar based grid-connected power system is becoming a very fast growing area due to the shortage of the fossil fuel energy and the great environmental pollution. But the grid continuously supplies the power even when load is not present. This cause harmful situation in and around the grid. In the proposed technique, First Zeta converter is designed using PID(Proportional Integral Differential) control technique for regulated DC output later the issue caused due to non-availability of load is solved by isolating the DC converter supplied to the inverter. The DC to DC converter is isolated using trip switch, so that power coming to load side is blocked as shown in figure 1. Here, DC-DC converter is designed to produce the regulated output also ability to handle the islanding problem. In order to monitor the converter, DC supply is fed to PWM(Pulse Width Modulation)inverter. These method is initially approached theoretically and further the condition tested and analyzed using simulation results. The PIDcontroller used in this paper is to provide optimum DC output during abnormal input and load condition. A novel digital logical control is designed near the load to isolate problems occurred due to islanding.