Operating standby redundant controller to improve voltage source inverter reliability

This paper presents a digital control architecture that demonstrates operating standby redundancy for a voltage source inverter (VSI) controller. The reliability analysis shows the increased lifetime of the VSI using a standby redundant controller. The VSI control system is designed to switch from the primary to the secondary controller when a fault to the primary controller occurs. Simulated and experimental results validate that the redundant controller design switches between FPGA (field programmable gate array) based redundant controllers with no measurable disturbance to the output voltage.