Three-phase Tri-State Current Source Inverter for photovoltaic energy stand-alone applications

This paper proposes the design of a Tri-State Boost Current Source Inverter with a Modified Space Vector Pulse Width Modulation. This converter is promising for many renewable energy applications. The Modified Space Vector PWM was created in order to determinate the converter state times and generate the switching signals, depending on the photovoltaic panel MPPT algorithm output and the modulation index. The Tri-State Boost CSI eliminates the RHP zero that is present in the Traditional Current Source Inverter by adding a freewheeling state. The partial experimental results show that this converter can operate as expected and is suitable for stand-alone situations that require high efficiency and reliability. The target application of the converter is to track the point which occur the maximum power transfer from the panel to the load.