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The Simplified PWM Method using Serial Communication in Cascaded H-Bridge Multilevel Inverter  

Park Young-Min (현대중공업 기계전기연구소)
Ryu Han-Seong (현대중공업 기계전기연구소)
Lee Hyun-Won (현대중공업 기계전기연구소)
Lee Se-Hyun (현대중공업 기계전기연구소)
Lee Chung-Dong (현대중공업 기계전기연구소)
Yoo Jl-Yoon (고려대 공대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.9, no.6, 2004 , pp. 620-627 More about this Journal
Abstract
As h-bridge multilevel inverter is connected with series of single phase power cell, so it obtain high voltage using low voltage power semi-conductor and output voltage similar to sine wave. In this topology, the number of power cell increases in proportion to the output voltage level. Therefore, there are drawbacks that are responsibility against operating ability of main controller and signal wire increase. However, we can overcome this problems by the substitution of serial communication for the PWM signal in power cell control. Additionally, it has merits of reliability and maintenance. This paper deals with the synchronization and phase-shift method of power cell PWM using CAN(Controller Area Network) communication interrupt in H-bridge multilevel inverter. The advantages of proposed method are signal-line simplification using serial communication between main controller and cell controller, burden reduction in main controller, modularization of power cell, easy protection of each power cell, expandability improvement and reliability increase of control signal and power cell. This paper establishes propriety and reliability of proposed method through experiment of 13-level H-bridge multilevel inverter.
Keywords
Multilevel Inverter; Cascaded H-bridge; Power Cell; PWM; Synchronization; Phase Shift; Serial Communication; CAN;
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