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

Jigui Zheng, Jing Chen, Ping Zheng, Hongxing Wu and Chengde Tong
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Jigui Zheng: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, 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

Energies, 2017, vol. 10, issue 10, 1-17

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.

Keywords: free-piston Stirling power generating system; current decoupling; internal model control based on sliding mode (IMC-SM) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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