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access icon free Research on cascaded three-phase-bridge multilevel converter based on CPS-PWM

  • Author(s): Zhi-G. Lu 1 ; Li-L. Zhao 1 ; Wan-P. Zhu 1 ; Chun-J. Wu 1 ; Yu-S. Qin 2
    • View affiliations
    • Affiliations: 1: State Key Laboratory of Power Transmission Equipment and System Security and New Technology (Chongqing University), Shapingba District, Chongqing 400044, People's Republic of China;
      2: Chongqing Nan'an Power Supply Bureau, Nan'an District, Chongqing 400060, People's Republic of China
  • Source: Volume 6, Issue 6, July 2013, p. 1088 – 1099
    DOI:  10.1049/iet-pel.2012.0510 , Print ISSN 1755-4535, Online ISSN 1755-4543
© The Institution of Engineering and Technology
Received 19/09/2012, Accepted 03/02/2013, Revised 06/01/2013, Published

Cascaded multilevel converters are emerging as a new breed of power converter options for high-voltage and high-power applications. A cascaded three-phase-bridge (C3PB) multilevel topology is proposed in this study. The new multilevel converter topology is derived from an optimum combination of three-phase voltage source converter modules and it needs fewer switches and dc capacitors than Δ-connected cascaded H-bridge converter under the similar operation condition. The characteristics of the C3PB converter are presented through analysing its current relationship, voltage relationship and power allocation in detail; the analysis results show that all the converter modules equally share the output power. Based on carrier phase-shifted pulse-width modulation (CPS-PWM) technique, simulation results of two-level and three-level inverter are given to verify the theoretical analysis; meanwhile, CPS-PWM and power decoupling control method are employed to validate the three-level C3PB rectifier. Finally, based on Digital Signal Processor (DSP) + Field Programmable Gate Array (FPGA) control board, a lab prototype is built to verify the validity and feasibility of the proposed C3PB converter along with the proposed control method.

Inspec keywords: digital control; power control; power capacitors; PWM power convertors

Other keywords: high-power applications; Δ-connected cascaded H-bridge converter; switches; DSP-FPGA control board; C3PB converter characteristics; power allocation; three-level C3PB rectifier; C3PB multilevel topology; three-level inverter; two-level inverter; dc capacitors; CPS-PWM technique; cascaded three-phase-bridge multilevel topology; Δ-connected cascaded H-bridge converter; carrier phase-shifted pulse-width modulation technique; power converter; cascaded three-phase-bridge multilevel converter module; high-voltage applications; power decoupling control method

Subjects: Discrete control systems; Power and energy control; Power convertors and power supplies to apparatus; Other power apparatus and electric machines; Control of electric power systems

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