PROJECT TITLE :

A Three Port Converter Based Distributed DC grid -connected pv system

ABSTRACT:

This research proposes a hybrid-connected three-port converter (TPC)-based distributed dc grid-connected photovoltaic (PV) generation setup and associated control method. With the proposed setup and control technique, it is possible to achieve distributed maximum power point tracking (MPPT) and self-sufficient voltage sharing control. Pulsewidth modulation plus phase shift (PPS) driven TPCs with soft switching and low voltage stress are part of the proposed system. There is an individual MPPT for each TPC, and the output ports are connected in series to interface with a high-voltage dc bus, while the bidirectional ports are connected in parallel to construct a low-voltage dc bus. Through the LV dc bus, these TPCs can transfer mismatched power from the input sources and achieve power and voltage balancing on the HV output side. A bidirectional port's output voltage can be shared by controlling the voltage reference in a linear relationship with the module's own voltage and current. This allows for a completely modular design. The Routh-Hurwitz criterion is used to demonstrate the system's stability using the given control approach. There are examples of simulation and experimentation to demonstrate the advantages of the proposed design.