Analytical Efficiency Evaluation of Modular Multilevel Converter for HVDC System

In this paper, the structure of MMC based HVDC system is discussed. Then, an analytical method based on average current and root mean square (RMS) of the current passing through the sub module is presented to calculate the conversion losses in the switching devices of MMC. The method is applied considering the full bridge sub module topology. Then, considering a case with certain parameters, a MATLAB program is developed and the losses and efficiency curves for each switching device and sub module are obtained respectively. Also, those factors which affect the losses and efficiency of the sub module are discussed.

[1]  J. Belanger,et al.  Modeling and control of a full-bridge modular multilevel STATCOM , 2012, 2012 IEEE Power and Energy Society General Meeting.

[2]  Philip Tavel,et al.  Modeling and Simulation Design , 2011 .

[3]  Frede Blaabjerg,et al.  Power losses in PWM-VSI inverter using NPT or PT IGBT devices , 1994 .

[4]  Guangfu Tang,et al.  Evaluation of losses in VSC-HVDC transmission system , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[5]  Conversion and delivery of electrical energy in the 21st century , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.