Impedance-Based Stability Analysis of Less Power Electronics Integrated Electric Shipboard Propulsion System Considering Operation Mode, PLL, and DC-Bus Voltage Control Effect

Kai Ni, Chun Gan*, Guojia Peng, Yihua Hu, Ronghai Qu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A doubly-fed induction machine (DFIM) is a promising choice for the shipboard propulsion system (SPS) of a more-electric ship (MES) to increase the system safety level by employing less power electronics. In this paper, the detailed impedance model of DFIM-SPS is established, with a salient-pole synchronous generator (SPSG) acting as the power source and a DFIM functioning as the propulsion load. The impedance modelling of DFIM is carried out from the aspect of ac coupling between the stator and rotor circuits, which is easy for physical understanding. In addition, the back-to-back power converter (BTBPC) is regarded as controlled voltage sources with impedances in the equivalent circuit. The phase-locked loop (PLL) is a key element in influencing the system stability, and it is integrated to upgrade the system dq impedance model. Moreover, the impedance shaping effect caused by dc-bus voltage control is investigated. Nyquist stability criterion is employed for system small-signal stability analysis, which is implemented with respect to the DFIM operation mode and PLL controller effect, and the time-domain simulations are carried out to verify the stable operation of a 5 MW DFIM-SPS in Matlab/Simulink. Furthermore, the experimental verification is done on a 1.5 kW DFIM electric drivetrain platform.

Original languageEnglish
Article number9352562
Pages (from-to)2219-2230
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Issue number3
Publication statusPublished - 10 Feb 2021

Bibliographical note

Funding Information:
Manuscript received August 5, 2020; revised December 18, 2020; accepted February 2, 2021. Date of publication February 10, 2021; date of current version April 2, 2021. This work was supported in part by the National Natural Science Foundation of China under Grants 52007071 and 51907073, in part by the China Postdoctoral Science Foundation under Grants 3004131154 and 2020M672355, and in part by the Applied Basic Frontier Program of Wuhan under Grant 2020010601012207. The review of this article was coordinated by Prof. M. Kazerani. (Corresponding author: Chun Gan.) Kai Ni, Chun Gan, Guojia Peng, and Ronghai Qu are with the State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).

Publisher Copyright:
© 1967-2012 IEEE.


  • Doubly-fed induction machine
  • impedance model
  • Nyquist stability criterion
  • phase-locked loop
  • salient-pole synchronous generator
  • shipboard propulsion system

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