Published Paper Details:

The employment of digital microprocessors for the operation of grid-connected inverters has become possible as a result of recent advancements in the technology of digital signal processing. However, the phase lag that is caused by temporal delays is a barrier that prevents digital implementation from being successful. Within the context of this phase lag, the stability and robustness of the inverter controller are evaluated. Within the context of grid connections, this work provides a complete analysis of time-delay compensation techniques for both model-free (MF) and model-based (MB) inverter controllers. In most cases, proportional-integral and proportional resonance controllers are used in MF techniques. Additionally, some strategies are employed with the intention of decreasing time delay. MB control strategies and model predictive controller are summarized in this work. These techniques are among the most frequently used control techniques for MB. Along with a discussion of essential concerns pertaining to the MF and MB processes, this article provides a detailed description of several comparable strategies that have been extracted from the existing body of research with the intention of reducing delays. In this study, a theory is presented on the method that is currently being used, and a hybrid technique that combines the MF and MB procedures is proposed. This study also provides a path for more research to follow.