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Energies 2018, 11(1), 135; doi:10.3390/en11010135

A Free-Piston Linear Generator Control Strategy for Improving Output Power

1
Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Zhejiang Key Laboratory of Robotics and Intelligent Manufacturing Equipment Technology, Ningbo 315201, China
2
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China
3
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Author to whom correspondence should be addressed.
Received: 9 December 2017 / Revised: 1 January 2018 / Accepted: 2 January 2018 / Published: 5 January 2018

Abstract

This paper presents a control strategy to improve the output power for a single-cylinder two-stroke free-piston linear generator (FPLG). The comprehensive simulation model of this FPLG is established and the operation principle is introduced. The factors that affect the output power are analyzed theoretically. The characteristics of the piston motion are studied. Considering the different features of the piston motion respectively in acceleration and deceleration phases, a ladder-like electromagnetic force control strategy is proposed. According to the status of the linear electric machine, the reference profile of the electromagnetic force is divided into four ladder-like stages during one motion cycle. The piston motions, especially the dead center errors, are controlled by regulating the profile of the electromagnetic force. The feasibility and advantage of the proposed control strategy are verified through comparison analyses with two conventional control strategies via MatLab/Simulink. The results state that the proposed control strategy can improve the output power by around 7–10% with the same fuel cycle mass. View Full-Text
Keywords: free-piston; output power; control strategy; linear generator free-piston; output power; control strategy; linear generator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, C.; Chen, F.; Li, L.; Xu, Z.; Liu, L.; Yang, G.; Lian, H.; Tian, Y. A Free-Piston Linear Generator Control Strategy for Improving Output Power. Energies 2018, 11, 135.

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