Modular Soft-switched PV Converter with an Efficiency Optimization Scheme for High Frequency Linking Power Balancers

A modular photovoltaic (PV) step-up converter with embedded high frequency power balancers that utilize an interlinking controller capable of power efficiency optimization over a wide operating range for Medium Voltage (MV) DC distribution is proposed in this paper. The converter utilizes an integrated boost-CLL resonant circuit with power balancing active voltage quadruplers (AVQ) to achieve step-up voltage conversion, individual maximum power point tracking (MPPT) and modular power balancing. The proposed interlinking power balancer controller optimizes the transmission of mismatched power while simultaneously achieving soft-switching operation on all AVQ circuits. The modular nature of the system allows for additional modules to be added without requiring parameter changes to the existing system. Analysis of the proposed converter and power balancing technique along with 10kW, 10kV-output system simulation and preliminary results on a scaled down 500W, 850V-output system are provided to highlight the features of the proposed system.