Synchronisation Control Action for Very Low-Frequency Oscillations
- Resource Type
- Conference
- Authors
- Duggan, Connor; Brogan, Paul; Liu, Xueqin; Best, Robert; Morrow, John
- Source
- 2021 32nd Irish Signals and Systems Conference (ISSC) Irish Signals and Systems Conference (ISSC), 2021 32nd. :1-7 Jun, 2021
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Damping
Torque
Power system stability
Generators
Stability analysis
Delays
Synchronization
Very Low-Frequency Oscillations
DEF
Control Decisions
wide-area monitoring and control
power system stability
- Language
- ISSN
- 2688-1454
Very low-frequency oscillations have been occurring on power grids with a high concentration of hydro generation and islanded grids with a lack of AC interconnection. These oscillations can persist in an ambient form or be triggered by a transient event before growing to the extent that threatens system stability. When a severe event occurs, it is important to identify the cause and have practical control actions to restore power system stability. Firstly, this paper demonstrates that synchronising a generator with a positive damping torque component can restore positively damped conditions. Simulations on a modified 2-Area system are evaluated with DIgSILENT PowerFactory. A transport delay is added to speed feedback of a GAST model governor to simulate a spontaneous negatively damped very-low-frequency oscillation with the appearance of being self-excited after a generation load imbalance. Secondly, a 300 mHz 0.08 Hz very-low-frequency oscillation on the Irish electrical grid is analysed using the governor based dissipation energy flow method. Dissipation energy flow is used to illustrate how the synchronisation of 2 generators successfully returned Ireland’s power system to positively damped conditions.