Sampling Rate and Performance of DC/AC Inverters with Digital PID Control—A Case Study

The huge influence of the sampling rate on performance digital PID control a voltage source inverter (VSI) is revealed. It shown that an appropriately chosen continuous-time model controller with PWM power converter behaves like actual discrete-time system, which allows for simple analysis and design. variable structure nature both RC rectifier abruptly changing resistive load two modes operation within period directly taken into account. Two simulation models, continuous-time, are presented, used to tune evaluate performance. behavior system in explained basis root loci frequency characteristics. results obtained three rates: 12.8, 25.6, 51.2 kHz, presented compared VSI experiment. A comparison other this shows properly tuned outperforms more sophisticated solutions based coefficient diagram method (CDM) passivity (PBC).