Modelling of variable-speed refrigeration for fast-frequency control in low-inertia systems
| Autor: | Evangelos Vrettos, Gabriela Hug, Uros Markovic, Johanna Vorwerk, Petros Aristidou |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Frequency response
Computer science Digital storage Automatic frequency control power system control reduced order systems thermal storage time constants single-phase vsr unit frequency-domain analyses Transfer function DC motor power system stability Refrigeration thermal loads Storage as a service Heat storage small-signal stability analysis time-domain simulations Economic and social effects low-inertia systems brushless dc motors Grid Frequency domain shiftable loads Natural Sciences lcsh:TK1-9971 Information Systems Computer and Information Sciences Computer Networks and Communications Time domain analysis Brushless DC motors Systems and Control (eess.SY) Electrical Engineering and Systems Science - Systems and Control power systems Electric power system frequency control refrigeration Robustness (computer science) FOS: Electrical engineering electronic engineering information engineering variable-speed refrigeration technology Electrical and Electronic Engineering large-scale systems fast-frequency control fast-frequency response reduced-order models Control engineering power grids time-domain analysis frequency-domain analysis transfer functions frequency response lcsh:Electrical engineering. Electronics. Nuclear engineering |
| Zdroj: | IET Smart Grid, 3 (6) IET Smart Grid (2020) |
| Popis: | In modern power systems, shiftable loads contribute to the flexibility needed to increase robustness and ensure security. Thermal loads are among the most promising candidates for providing such service due to the large thermal storage time constants. This study demonstrates the use of variable-speed refrigeration (VSR) technology, based on brushless DC motors, for the fast-frequency response. First, the authors derive a detailed dynamic model of a single-phase VSR unit suitable for time-domain and small-signal stability analysis in low-inertia systems. For analysing dynamic interactions with the grid, they consider the aggregated response of multiple devices. However, the high computational cost involved in analysing large-scale systems leads to the need for reduced-order models. Thus, a set of reduced-order models is derived through transfer function fitting of data obtained from time-domain simulations of the detailed model. The modelling requirements and the accuracy versus computational complexity trade-off are discussed. Finally, the time-domain performance and frequency-domain analyses reveal substantial equivalence between the full- and suitable reduced-order models, allowing the application of simplified models in large-scale system studies. IET Smart Grid, 3 (6) |
| Databáze: | OpenAIRE |
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