A Flexible DC Voltage Balancing Control Based on the Power Flow Management for Star-Connected Cascaded H-Bridge Converter

作者：Chen Hsin Chih^*; Wu Ping Heng; Lee Chia Tse; Wang Ching Wei; Yang Ching Hsiang; Cheng Po Tai

来源：IEEE Transactions on Industry Applications, 2016, 52(6): 4946-4954.

DOI：10.1109/TIA.2016.2600667

• Capacitor voltage balancing control
• low-voltage ride-through (LVRT)
• modular multilevel cascaded converter
• PWM cascaded converter
• static synchronous compensators (STATCOM)

This paper presents the flexible dc capacitor voltages balancing control method for star-connected cascaded H-bridge converters. In this paper, the power flows are analyzed by investigating all the converter's control freedoms. Based on the analyses, users can accomplish the dc capacitor voltage balancing with both negative-sequence current and zero-sequence voltage. These two kinds of control options are further integrated together with the defined weighting factor K. The low-voltage ride-through operation of a proposed control method is also discussed in this paper. The control method is verified with a 220-V 1-kVA static synchronous compensators based on the star-connected cascaded H-bridge converters, and the experimental test results show that all the dc voltages are well regulated at the commanded value with different weighting factor K.

• 出版日期2016-12
• 单位清华大学