Industrial Smart Load Using Five-Level ANPC Converter with Sensorless Modulation Method

In this work, a new configuration for the second version of electric spring based on the single-phase AC 5-level active-neutral-point-clamped converter (ANPC5L) for industrial applications has been introduced. This device installed in series with an industrial noncritical load as a smart load has the capability to stabilize the voltage of the industrial loads and improve the power quality of the system autonomously. In comparison to current electric spring topologies, the introduced configuration has numerous advantages, which make it suitable for industrial applications. Operating principles, topology, and sensorless modulation method of this 5-level electric spring are also presented. Furthermore, for the controller, a radial-chordal decomposition method with only one closed-loop PI has been modified and employed. Finally, the proposed configuration steady state and dynamic performance in different operation modes are validated by the provided simulation results.