Current Sharing/Voltage Sharing Control Strategy for Cascaded DC/DC Converter in Photovoltaic DC Collection System

For Photovoltaic DC collection system, input-parallel-output-series DC/DC converter is widely preferred to realize the voltage conversion between low input voltage and high output voltage. For the seeking of enhancing the stable operation, the output voltage of each module mutual equality must be guaranteed. This paper proposes a current/voltage sharing control strategy for cascaded DC/DC converter in photovoltaic DC collection system. The proposed control method is realized through a double loop contracture, which can realize MPPT of PV module and output voltage sharing between cascaded modules. The effectiveness of the proposed method has been violated by simulation results.