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Coordinated frequency regulation among asynchronous AC grids with an MTDC system
- Source :
- International Journal of Electrical Power & Energy Systems. 126:106604
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- With the increasing penetration level of renewable power, the power systems’ inertias are decreasing. To ensure that the frequency is above the threshold of the under frequency load shedding, one effective way is to share the spinning reserves among asynchronous AC grids through HVDC systems. In this paper, a coordinated frequency regulation scheme that enables spinning reserves sharing is proposed for such hybrid AC/DC grids. This scheme is a communication-free method that consists of the droop control, the inertia emulation control and the frequency safety control. The combined response of the three controls can increase not only the frequency nadir but also the settled frequency of the disturbed grid. In addition, the hysteresis comparators and the power injection limits are adopted in the frequency regulation scheme to reduce the coupling effect among AC grids. Thus, under small and harmless disturbance, the frequency regulation scheme will be inactive; the disturbance in strong AC grids would not affect the weak AC systems. The frequency regulation scheme coordinates well with the automatic generation control of the grids. The feasibility and effectiveness of the proposed frequency regulation scheme are verified through simulation studies.
- Subjects :
- Emulation
Comparator
Automatic Generation Control
Computer science
020209 energy
media_common.quotation_subject
020208 electrical & electronic engineering
Energy Engineering and Power Technology
02 engineering and technology
Grid
Inertia
Electric power system
Asynchronous communication
Control theory
0202 electrical engineering, electronic engineering, information engineering
Voltage droop
Electrical and Electronic Engineering
media_common
Subjects
Details
- ISSN :
- 01420615
- Volume :
- 126
- Database :
- OpenAIRE
- Journal :
- International Journal of Electrical Power & Energy Systems
- Accession number :
- edsair.doi...........fe2ea5d50d023fd2778d7edb0fb66716