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

Harmonic loss is a common problem in harmonics research area. A 12-pulse AC-DC converter is the most widely topology used in different heavy industrial loads. Because the 5-, 7-th and etc. harmonic currents will disappear in primary side of the converter transformer under ideal operation condition. Simultaneously, other terms are produced from the converter through its transformer, and inject into the distribution system. They will increase losses in source side. However, no exact analytical method was proposed to analyze the noted effect via new real power definition in literature. Therefore in this paper, the authors will propose an effective method to solve the noted problem. Via the proposed method and statistical theory, a 12-pulse MVA-rating converter load in a heavy chemical industry is presented to analyze and estimate harmonic losses. According to these analytic results of harmonic losses can provide available data for the power engineer to understand power losses and characteristics of demand-side.