EFFECTIVE VOLTAGE AND LINE CURRENT SENSING DESIGN OF GRID CONNECTED INVERTERS

electronics and instrumentation engineering

This paper proposes the prototype of grid connected inverters in a PV system for accurate sensing of grid voltage and line current in inverters.Unlike the existing system , the proposed system uses LEM sensor technology for measuring its parameters.The obligation for heavy and bulky current transformers are eliminated with the proposed system.The system uses phase locked loop(PLL) for AC voltage measurements and to determine the zero crossing point and phase angles of the parameter under measurement. The main aim of the project is to synchronize the output signal of the inverter with the reference signal from the EB and it has the ability to adjust the inverter output so that both the phase angles match. The basic components of this are MPPT, DCDC and DC-AC fly-back converters, PLL, relays, grid. At last combining the above parts, the voltage, the current of the inverter is taken. The final results are extracted after the system optimization.

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