Abstract
Frequency performance has been a crucial issue for islanded microgrids. On the one hand, most distributed energy resources are converter-interfaced and do not inherently respond to frequency variations. On the other hand, current inertia emulation approach cannot provide guaranteed response. In this paper, a model reference control based inertia emulation strategy is proposed for diesel-wind systems. Desired inertia can be precisely emulated through the proposed strategy. A typical frequency response model with parametric inertia is set to be the reference model. A measurement at a specific location delivers the information about the disturbance acting on the diesel-wind system to the reference model. The objective is for the speed of the diesel generator to track the reference so that the desired inertial response is realized. In addition, polytopic parameter uncertainty will be considered. The control strategy is configured in different ways according to different operating points. The parameters of the reference model are scheduled to ensure adequate frequency response under a predefined worst case. The controller is implemented in a nonlinear three-phase diesel-wind system fed microgrid using the Simulink software platform. The results show that exact synthetic inertia can be emulated and adequate frequency response is achieved.
| Original language | English |
|---|---|
| Article number | 8338153 |
| Pages (from-to) | 6557-6568 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Power Systems |
| Volume | 33 |
| Issue number | 6 |
| DOIs | |
| State | Published - Nov 2018 |
Funding
Manuscript received September 22, 2017; revised February 4, 2018; accepted March 31, 2018. Date of publication April 16, 2018; date of current version October 18, 2018. This work was supported in part by the Engineering Research Center Program of the National Science Foundation and the Department of Energy under NSF Award Number EEC-1041877, and in part by Research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. Paper no. TPWRS-01469-2017. (Corresponding author: Yichen Zhang.) Y. Zhang, S. M. Djouadi, and K. Tomsovic are with the Min H. Kao Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, TN 37996 USA (e-mail:,[email protected]; mdjouadi@ utk.edu; [email protected]).
| Funders | Funder number |
|---|---|
| UT-Battelle | |
| National Science Foundation | 1711432, EEC-1041877 |
| U.S. Department of Energy | |
| Directorate for Engineering | 1041877 |
| Oak Ridge National Laboratory |
Keywords
- Inertia emulation
- diesel-wind system
- low-inertia microgrid
- model reference control
- polytopic uncertainty