LINEAR AND NON-LINEAR VOLTAGE-TO-FREQUENCY MULTI-ZONE CONTROL OF SYNCHRONOUSLY MODULATED POWER ELECTRONIC INVERTERS

The publication presents a brief analysis of the results from the study on power electronic converters based on voltage source inverters (VSIs) and neutral-point-clamped inverters (NPCIs) with scalar control modes implemented by algorithms of synchronous multizone pulsewidth modulation (SMZ PWM). This control and modulation strategy can provide both linear and required non-linear relationships between the output voltage and the fundamental frequency of the inverters (Voltage/Frequency (V/F)). The simulation results demonstrated the behavior of two inverter-based drive systems controlled by algorithms of SMZ PWM, providing both linear and non-linear V/F relationships. Thus, the appropriately modified techniques of SMZ PWM, used for regulating inverters of adjustable speed electric drives, ensure continuous synchronization and symmetry of phase and line voltages in these electrical power conversion systems over the entire regulation range.