Frequency locked loops in estimating active, reactive and apparent powers with DC offset elimination

The goal of this article is to describe a power measuring system using the frequency-locked-loop (FLL). The FLLs have a wide variety of applications such as power converters, grid synchronization, sensorless flux estimation and control of motor drives. This nature of the FLL system allows for it to be a potentially perfect tool for power calculation. In this article, a new power calculation method has been presented. This method is based on FLL as part of phase locked loop (PLL) and has enhanced feature over classical methods for power calculation widely used in industry. The obtained results showcase the effectiveness of the proposed FLL power calculation method.