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Pulse Width Modulated Thyristor CSI for Grid Connected Photovoltaic Applications
G. R. Kulkarni and Nilesh B. Kalani

A new three phase active commutated thyristor current source inverter (CSI) topology is proposed for grid connected photovoltaic systems. Space vector PWM with a special switching sequence, which ensures proper commutation of thyristors, is implemented. In order to suppress the natural frequency of oscillations of LC filter and to ensure stability of the system, a charge controller in synchronous rotating reference frame is described. This allows easy design of PI controller gains. The simulation results of a 7-kVA inverter are presented.

Keywords: current source inverter, grid connection, active commutation

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