Three Phase Generalised Power Theory for the Measurement of Powers in an Electric Power System

The deficiencies of present power measurement definitions and techniques in the presence of harmonics is a known problem. As a solution to this problem, a new three phase power theory, which decomposes the instantaneous power into active and non-active instantaneous power, is proposed. With good knowledge of the active/non-active power components an accurate measurement especially of the non-active component is achieved. Also this non-active component can be utilised to achieve better compensation. The theory is evaluated for linear and nonlinear loads in the presence of harmonics with a case study. Results of case study and analysis of the results demonstrate good performance of the proposed theory.