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High Frequency Dual-Buck Full-Bridge Inverter Utilizing a Dual-Core MCU and Parallel Algorithm for Renewable Energy Applications

Author

Listed:
  • Zhun Meng

    (School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China)

  • Yi-Feng Wang

    (School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China)

  • Liang Yang

    (School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China)

  • Wei Li

    (School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China)

Abstract

A high frequency dual-buck full-bridge inverter for small power renewable energy applications is proposed in this paper. The implementation of the wide band gap SiC (Silicon Carbide) power device contributes to the high switching frequency of 400 kHz. This high frequency contributes to reduced converter volume as well as improved power density, which greatly strengthens its portability and application range. For the control strategy, a voltage-current dual loop controller is employed. A three-pole-three-zero (3P3Z) compensator is applied in the current loop in order to track the current reference without static error. A voltage loop two-pole two-zero (2P2Z) compensator is used to generate the current reference for stabilizing the DC bus voltage. Not only is the inner current loop analyzed in detail, which includes the modeling of the equivalent inductor-capacitor-inductor (LCL)-type inverter and the design of the 3P3Z compensator, but also the outer voltage loop is discussed, the model of which is established based on the energy balance. Furthermore, a feedback linearization method is adopted to simplify the duty cycle calculation and helps to accelerate the control speed. A second-order generalized integrator software phase lock loop (SOGI-SPLL) is employed to obtain the phase angle and to synchronize the inverter output current with the grid voltage. A parallel structure algorithm is conducted based on a dual-core microcontroller unit (MCU) for the first time to control the high frequency inverter. This approach avoids the contradiction between the high frequency operation and the limited computing capacity of the conventional single-core MCUs. The software structure, time-consuming distribution, and interactive communication method are analyzed in detailed. Finally, this paper verifies the feasibility of the theoretical analyses through simulation and experiments based on a 1 kW prototype.

Suggested Citation

  • Zhun Meng & Yi-Feng Wang & Liang Yang & Wei Li, 2017. "High Frequency Dual-Buck Full-Bridge Inverter Utilizing a Dual-Core MCU and Parallel Algorithm for Renewable Energy Applications," Energies, MDPI, vol. 10(3), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:402-:d:93673
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    References listed on IDEAS

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    Cited by:

    1. HwaPyeong Park & DoKyoung Kim & SeungHo Baek & JeeHoon Jung, 2019. "Extension of Zero Voltage Switching Capability for CLLC Resonant Converter," Energies, MDPI, vol. 12(5), pages 1-14, March.
    2. Pedro J. Villegas & Juan A. Martín-Ramos & Juan Díaz & Juan Á. Martínez & Miguel J. Prieto & Alberto M. Pernía, 2017. "A Digitally Controlled Power Converter for an Electrostatic Precipitator," Energies, MDPI, vol. 10(12), pages 1-24, December.

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