Injected harmonic losses analysis and estimation due to a 12-pulse AC-DC converter load

Harmonic losses are a common problem in the harmonic research area. A 12-pulse AC-DC power converter is the most widely topology used in different heavy industrial loads because the 5th, 7th, etc. harmonic currents will disappear in the primary side of the power converter transformer under ideal operation conditions. Simultaneously, other terms are produced from the power converter through its transformer, and injected into the distribution system. However no exact analytical method has been proposed to analyze such effects via the new real power definition in the literature. Therefore, in this paper, the authors propose an effective method to solve the above problem. Via the proposed method and statistical theory, a 12-pulse MVA-rating power converter load in a heavy chemical industry is presented to analyze and estimate harmonic losses. These results of harmonic losses can provide available data to enable power engineers to understand power losses and the characteristics of demand-side loads.