Real-time Closed-loop PQ Control of NPC Multi-level Converter Using OPAL-RT and Speedgoat Simulators

This paper introduces real-time modeling and simulation of the reactive and active power control of Neutral-Point Clamped (NPC) multilevel Voltage Source Inverter (VSI). A decoupled control scheme has been implemented based on the current at the terminal of the VSI. The simulation is performed on OPAL-RT and Speedgoat digital simulators. Further, full closed-loop models are evaluated in an experimental benchmark for the step response of active and reactive power (P and Q) changes. The real-time modeling and prototyping shows the capability of fully closed-loop control to develop and validate actual power electronic devices implemented on the power networks.