Voltage-Source Converter Energy Efficiency Classification in Accordance With IEC 61800-9-2

Abstract

New global energy efficiency classification standard IEC 61800-9-2 for frequency converters and motor systems has been recently launched. It classifies the energy efficiency of the converters and motor-drive systems and introduces three different methods to determine a voltage source converter (VSC) losses for the classification. In here, experimental tests are carried out using the input-output method and the calorimetric method to determine the losses and efficiency of a 160 kW commercial voltage source converter (VSC). The measurement results with these two independent methods are compared and the uncertainty of the methods are analyzed. The converter electric input and output power distributions are analyzed in the frequency domain and are used further to estimate the electric power measurement uncertainty. The measurement uncertainty related to losses obtained with the input-output method is compared with the loss difference between the two methods. This is the first research work to accurately evaluate the experimental methods for the determination of the power losses and examine the validity of the energy efficiency classes of the frequency converters according to new IEC61800-9-2. An urgent need to update the loss boundaries of the IE-classes has been found and the measurement uncertainty effect on the IE-classification is discussed.

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