Abstract:
This project proposes a hybrid-connected three-port converter (TPC)-based distributed dc grid-connected photovoltaic (PV) generation configuration and control strategy. The configuration and control strategy achieves distributed MPPT and autonomous voltage sharing control. The proposed system uses modular pulsewidth modulation plus phase-shift (PPS) controlled TPCs with soft switching and low voltage stress. To achieve individual MPPT, each TPC’s input port is connected to an independent PV energy source, and the output ports are connected in series to interface with a high-voltage (HV) dc bus, while the bidirectional ports are in parallel to build a low-voltage (LV) bus. These TPCs can transfer input source power mismatches via the LV dc bus to balance HV output power and voltage. Only the module’s voltage and current are sensed when a bidirectional port’s voltage reference is linearly related to the output voltage. Fully modular design. Routh-Hurwitz shows stability with the proposed control strategy. Simulation and experimental results demonstrate the configuration and control strategy’s benefits.
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