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Research on Control Strategy of Free-Piston Stirling Power Generating System

Author

Listed:
  • Jigui Zheng

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
    Beijing Research Institute of Precise Mechatronics and Controls, Beijing 100076, China)

  • Jing Chen

    (Beijing Research Institute of Precise Mechatronics and Controls, Beijing 100076, China)

  • Ping Zheng

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China)

  • Hongxing Wu

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China)

  • Chengde Tong

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China)

Abstract

As a clean and fuel adaptive alternative power plant, the Stirling power generating system has drawn attention of experts and scholars in the energy field. In practical application, the instability of free-piston Stirling power generating system caused by abrupt load change is an inevitable problem. Thus, methods to improve the output frequency response and stability of the free-piston Stirling power generating system are necessary. The model of free-piston Stirling power generating system is built by isothermal analysis firstly, and the initial control strategy based on given voltage system is put forward. To further improve the performance of power system, a current feedback decoupling control strategy is proposed, and the mathematical model is established. The influence of full decoupled quadrature-direct ( d-q ) axis currents is analyzed with respect to the output voltage adjusting time and fluctuation amplitude under the variations of piston displacement and output load. The simulation results show that the system performance is significantly improved, but the dynamic regulation lags caused by the decoupled current control still exist. To solve this problem and improve the performance of decoupled-state feedback current control that relies on parameter accuracy, internal model control based on sliding mode (IMC-SM) current decoupling control strategy is proposed, the system model is established, and then the performance of voltage ripple in generating mode is improved. Finally, the test bench is built, and the steady state and transient voltage control performances are tested. The feasibility and priority of the control strategy is verified by experiment and simulation results.

Suggested Citation

  • Jigui Zheng & Jing Chen & Ping Zheng & Hongxing Wu & Chengde Tong, 2017. "Research on Control Strategy of Free-Piston Stirling Power Generating System," Energies, MDPI, vol. 10(10), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1609-:d:115147
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    References listed on IDEAS

    as
    1. Mikalsen, R. & Roskilly, A.P., 2010. "The control of a free-piston engine generator. Part 1: Fundamental analyses," Applied Energy, Elsevier, vol. 87(4), pages 1273-1280, April.
    2. Tavakolpour-Saleh, A.R. & Zare, SH. & Bahreman, H., 2017. "A novel active free piston Stirling engine: Modeling, development, and experiment," Applied Energy, Elsevier, vol. 199(C), pages 400-415.
    3. Tavakolpour-Saleh, A.R. & Jokar, H., 2016. "Neural network-based control of an intelligent solar Stirling pump," Energy, Elsevier, vol. 94(C), pages 508-523.
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    Cited by:

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