Abstract
This paper introduces a novel multiport power converter with modular architecture for photovoltaic (PV)-battery based power systems. Compared to conventional centralized multiport converters, the proposed converter significantly improves the utilization of PV available energy and battery capacity as it does not require a high number of series-connected PV and battery modules. The proposed converter also eliminates the need for additional battery cell/module equalizer circuitry by being able to implement directly energy management strategies that consider the different capabilities of battery modules to ensure charge/stress balancing. This makes it a promising solution for interfacing second-life batteries or for systems that utilize batteries with a high degree of mismatch. The modularity of the proposed converter enhances system reliability and fault tolerance and reduces the power/voltage ratings of the power electronic devices. The converter modes of operation, control strategy and design considerations are discussed. A 75 V/1 kW integrated PV-battery power system prototype is built and tested to validate the concept.
Highlights
The need to further advance the development of renewable energy sources points to exploring new ways of implementing power systems for new stationary and mobile applications and integration with energy storage
The conventional structure of DC power systems with renewable sources were constructed such that each source interfaces to the power bus via its own DC-DC converter which controls its mode of operation and adapts its voltage level with the bus voltage
During double input single output (DISO) and single input single output (SISO) modes which only cover the discharge of the battery, based on Equation (13), the theoretical output voltage ranges from 0 V up to voltage of its batterybatt (Vbatt)
Summary
The need to further advance the development of renewable energy sources points to exploring new ways of implementing power systems for new stationary and mobile applications and integration with energy storage. The conventional structure of DC power systems with renewable sources were constructed such that each source interfaces to the power bus via its own DC-DC converter which controls its mode of operation and adapts its voltage level with the bus voltage. Multiport converter (MPC) topologies have been shown to provide advantages compared to the convention systems, including lower cost and higher power density
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