1. Real-Time Data Acquisition Streaming and Control Interface for ePHASORsim
Kellen Oleksak, Kevin Tomsovic, Hantao Cui
The University of Tennessee, Knoxville
OPAL-RT API Interface for ePHASORsim
Simulating the Grid
Why Real-Time Simulators?
The OPAL-RT automated processing interface
allows for the development of real-time data
acquisition and streaming applications from a physically connected target system. It can be further expanded to measurement units and
control devices to simulate a scaled,
cyber-physical system with varying objectives.
Most notably, dynamic stability analysis for
large scale grid modeling.
Physical system testing is
not possible on large scale.
Renewable energy additions
Hardware in the loop can
only occur in real-time
No cost of operation loss.
Lab testing confirms system
upgrades and cost benefits
Interactivity and control
operations training
Reusable system models
with modifiable scenarios
and data initialization
Physical device and network
connectivity
Data Acquisition and Streaming Hierarchy
Device parameters for chosen scenario are sent to dynamic software and server
System model loaded in ePHASORsim software with I/O for state and discrete variables to stream to Large Scale Test Bed modules
Local simulation host arbitrates device names, indices, variables and data to server to initialize system parameters for requesting LTB modules
Power system model executes on real-time target generating device response data
Local simulation interface continually streams model data to modules according to module parameter requests
Automated and user defined control inputs allow for interactivity to effect simulation in real-time, concurrently allowing modules to respond to changes in device states such as active generators, bus faults, line faults and breaker switching.
Dynamic stability analysis tools and visualization provides model insight from small scale dynamics to wide-area connectedness
Power System Model
Data Initialization
Model Loaded in
ePHASORsim
Data
Generation
Local Simulation
Software Interface
OPAL-RT Interface
I/O
Mapping
Large Scale Test Bed
Streaming Service
Clients
Disturbance effect on bus phase angle
and voltage from HVDC line fault (prototype)
State Estimation
Computation
Tools
Visualization
Control
Fault Control Input Parameters
Bus/Line Number
Status (Active/Inactive)
Fault Start Time
Fault Duration
Control Input Event and Response
Modules on the LTB server initialize event activation time and duration to the local simulator
Local simulator sets control change inputs to Simulink block diagrams and/or S-Function blocks
Control input supports bus/line faults, generator status, line switching and breaker status
Simulator allows for real-time control input changes to operator actions for scenario testing
Closed loop results in direct state estimation and visualization to connected modules
Fault
Period
Activate
Set Fault Start
Control Input
Update Model
Deactivate
Set Fault End
Control Input
Update Model
Bus/Line Effects
At Event Time
Reset Bus/Line Status
Simulation Response
Bus/Line Parameters Variation
System Stability Analysis
Security Operations
Operator Responses
Simulink Fault Block Diagram