Benefits of energy recovery from the undesirable components of electric signals in electric power systems

This paper introduces an analytical framework for analyzing the benefits of using the waste-to-energy concept to improve power quality and energy efficiency in electric power systems. In this framework, closed-form expressions for evaluating the analytic cross-power spectral density between voltage and current signals are introduced to quantify the wasted energy associated with undesirable components of electric signals that result from the interaction between nonlinear loads and electric power systems. These expressions demonstrate the existing relationship between the analytic cross-power spectral density and the well-known complex power, which is widely used in electric power systems. In the sequel, it is shown that these expressions allow the introduction of the so-called Passive Filtering Energy Recovery, which aims to recover the wasted energy from the undesirable components of electric signals. Numerical results show that the Passive Filtering Energy Recovery, which relies on the waste-to-energy concept, can improve power quality and energy efficiency in the Brazilian and worldwide electric power systems.