Overview
A grid-forming converter (GFC) establishes a stable and controllable voltage at its output terminal without requiring external angle reference, which enables the GFC to be a candidate for providing black start services. The inherent voltage and frequency regulation attributes of GFC pose significant challenges to the conventional power hardware-in-the-loop (PHIL) simulation, which incorporates the physical power converter by regulating its voltage angle to be synchronized with that of an interfacing power amplifier mimicking the real-time emulated power grid.
The lack of voltage angular synchronization at the coupling point between the GFC and the interfacing power amplifier leads to instability. In addition, the robust operation of the PHIL closed-loop setup is susceptible to system dynamics (e.g., time delays, system impedance ratio, noise), which give rise to concerns related to stability and accuracy. Furthermore, the limited power capability of the candidate GFC, coupled with the interfacing power amplifier imposing rigorous voltage and current constraints for protection purposes in a laboratory environment, restrict the applicability of PHIL for high-power testing of GFC.
Objectives
This JRA project aims to address the limitations of the existing PHIL interfacing method, which has stability and accuracy issues due to the lack of voltage angular synchronization at the coupling point between the GFC and the interfacing power amplifier and to bridge the research gap stemming from the lack of a streamlined, optimized interface tailored specifically for PHIL testing of GFC.
Publications
- Alassi, Z. Feng, K. Ahmed, M. Syed, Agusti Egea-Alvarez and C. Foote, “Grid-forming VSM control for black-start applications with experimental PHiL validation,” International Journal of Electrical Power & Energy Systems, vol. 151, p. 109119, 2023. https://doi.org/10.1016/j.ijepes.2023.109119
- Erckrath, C. Bendfeld, R. Brandl and M. Jung, “Power Hardware-in-the-loop Validation of Grid-Forming Control and Current Limitation for Start up of Induction Motors in Microgrids,” in 25th European Conference on Power Electronics and Applications (EPE’23 ECCE Europe), Aalborg, Denmark, 2023. https://doi.org/10.23919/EPE23ECCEEurope58414.2023.10264509
- Feng, A. Alassi, M. Syed, R. Pena-Alzola, K. Ahmed and G. Burt, “Current-type power hardware-in-the-loop interface for black-start testing of grid-forming converter,” in IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society, Brussels, 2022. https://doi.org/10.1109/IECON49645.2022.9968517
- Hernandez-Alvidrez, N. S. Gurule, M. J. Reno, J. D. Flicker, A. Summers and A. Ellis, “Method to interface grid-forming inverters into power hardware in the loop setups,” in 2020 47th IEEE Photovoltaic Specialists Conference (PVSC), 2020. https//doi.org/10.1109/PVSC45281.2020.9300804
- Kikusato, T. S. Ustun, J. Hashimoto, K. Otani, T. Nagakura, R. M. Y. Yoshioka and K. Mori, “Developing power hardware-in-the-loop based testing environment for volt-var and frequency-watt functions of 500kw photovoltaic smart inverter,” IEEE Access, vol. 8, pp. 224135-224144, 2020. https://doi.org/10.1109/ACCESS.2020.3044327
Participants
Canada
Hydro-Québec Research Institute (IREQ), Natural Resources Canada (NRCan)
Denmark
Technical University of Denmark (DTU)
Germany
DERlab, Fraunhofer IEE
Japan
National Institute of Advanced Industrial Science and Technology (AIST)
United Kingdom
University of Strathclyde, WSP
United States of America
Sandia Lab
Contact
Zhiwang Feng
University of Strathclyde
Email
