Interfacing a transient stability model to a real-time electromagnetic transient simulation using dynamic phasors
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Date
2020-02
Authors
Konara Mudiyanselage, Harshani
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Abstract
This thesis presents a method to perform real-time Electromagnetic Transient (EMT) simulations for a large power system. The real-time EMT simulation can become prohibitively expensive for large power systems. A solution to this is to divide the system into an internal system where all details are important and an external system (the rest of the system) where only the electromechanical behaviour is important. This thesis presents a co-simulation model consisting of an EMT model and a Transient Stability (TS) model. The internal system is modelled using the EMT model and the external system is modelled using the TS model. The interface between the two models is a portion of the network (“buffer zone”) modelled using Dynamic Phasors (DP), which is less detailed than the EMT simulation approach, but more detailed than the TS model. The intermediate buffer zone modelled in DP enables smooth integration of EMT model and the TS model. The challenges of interfacing a DP model to an EMT model and a DP model to a TS model are discussed. A data prediction method is used to overcome the time-step delay between the EMT model and the DP model. The TS model uses a relatively larger integration time-step than the DP model and the DP-TS boundary voltages are updated at every DP time-step in the buffer. A novel voltage source type synchronous machine model is proposed in this thesis to interface to a DP model.
The EMT-TS co-simulation model is implemented in a real-time platform and it is validated using a complete EMT simulation. The New England & New York 68 bus system is used as the test system to validate the co-simulation model. The results of the co-simulation model show a good agreement with the EMT simulation results under the disturbance applied in the internal system.
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Keywords
Electromagnetic Transient, Transient stability, Dynamic phasors, Co-simulation, Real-time, simulation
Citation
CIGRE
IEEE
IPST
IEEE
IPST