Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title An Algorithm for Even Distribution of Loss, Switching Frequency, Power of Model Predictive Control Based Cascaded H-bridge Multilevel Converter
Authors I-Gim Kim ; Sang-Shin Kwak
DOI 10.6113/TKPE/2015.20.5.448
Page pp.448-455
ISSN 1229-2214
Keywords Multilevel inverter; Cascaded H-bridge inverter; Model predictive control; Cell balancing method; Switching pattern balancing
Abstract A model predictive control (MPC) method without individual PWM has been recently researched to simplify and improve the control flexibility of a multilevel inverter. However, the input power of each H-bridge cell and the switching frequency of switching devices are unbalanced because of the use of a restricted switching state in the MPC method. This paper proposes a control method for balancing the switching patterns and cell power supplied from each isolated dc source of a cascaded H-bridge inverter. The supplied dc power from isolated dc sources of each H-bridge cells is balanced with the proposed cell balancing method. In addition, the switching frequency of each switching device of the CHB inverter becomes equal. A simulation and experimental results are presented with nine-level and five-level three-phase CHB inverter to validate the proposed balancing method.