Title :
Control and Design of a Modular Multilevel Cascade BTB System Using Bidirectional Isolated DC/DC Converters
Author :
Akagi, Hirofumi ; Kitada, Ryohei
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
This paper discusses the control and design of the 6.6-kV back-to-back (BTB) system combining bidirectional isolated dc/dc converters and modular multilevel cascade pulsewidth modulation (PWM) converters. The system consists of multiple converter cells connected in cascade per phase at both front ends. Each converter cell consists of a bidirectional isolated medium-frequency dc/dc converter and two voltage-source H-bridge (single-phase full-bridge) PWM converters. Extremely low-voltage steps bring a significant reduction in harmonics and electromagnetic interference emissions to the BTB system. This paper designs, constructs, and tests a single-phase downscaled BTB system rated at 120 V and 3.3 kW to verify the viability and effectiveness, leading to the actual system.
Keywords :
DC-DC power convertors; PWM power convertors; cascade control; cascade systems; electromagnetic interference; harmonics; back-to-back system; bidirectional isolated DC-DC converter; electromagnetic interference emission; modular multilevel cascade BTB system; modular multilevel cascade pulsewidth modulation converter; multiple converter cell; single-phase downscaled BTB system; voltage 6.6 kV; voltage-source H-bridge PWM converter; DC-DC power converters; Feedforward neural networks; Inductors; Pulse width modulation; Pulse width modulation converters; Voltage control; Back-to-back (BTB) systems; bidirectional isolated dc/dc converters; multilevel converters;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2011.2107752
