PMU-based Real-Time Damping Control SystemSoftware and Hardware Architecture Synthesis and

Evaluation

Paper No: 15PESGM0516

M. Shoaib Almasmsalmas@kth.se

Associate Professor, Docent

Electric Power Systems DepartmentKTH Royal Institute

of TechnologyStockholm, Sweden

Special Advisor in Strategy and Public

AffairsR&D Department

(FoU)Statnett SF

Oslo, Norway

PhD CandidateElectric Power

Systems DepartmentKTH Royal Institute

of TechnologyStockholm, Sweden

Dr. Luigi Vanfrettiluigiv@kth.se

Eldrich Rebellorebello@kth.se

MSc. Thesis StudentElectric Power Systems

DepartmentKTH Royal Institute of

TechnologyStockholm, Sweden

BackgroundLow-frequency, electromechanically induced, inter-area oscillations are of concern in the continued stability of interconnected power systems.Wide Area Monitoring, Protection and Control (WAMPAC) systems based on wide-area measurements such as synchrophasor (C37.118) data can be exploited to address the inter-area oscillation problem.What did you do?

1. Developing a hardware prototype of a synchrophasor-based oscillation damping control system

2. A Compact Reconfigurable Input Output (cRIO) controller from National Instruments is used to implement the real-time prototype

Expectations?3. To document the software development process and challenges faced in the real-time

implementation of a wide-area control system.4. Hardware-in-the-loop experiment constructed around the eMEGASIM real-time

simulator from OPAL-RT for performance analysis of the developed hardware prototype

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Results• What did you discover/find out?

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Final architecture as implemented for the prototype

• PMU-based Phasor POD Algorithm for FACTS deployed in NI-cRIO FPGA.

• RT-HIL Testing performed by using Opal-RT and SEL PMUs.

• PMUs resolution set to 50 msgs/sec

Opal-RT PMUs Prototype WAPOD

synchrophasors3-phase

VoltageCurrent

Feedback Control

Conclusions/Recommendations

• Conclusion– A hardware prototype of a real-time power oscillation damping control system was

developed and tested. – The developed prototype uses a real-time implementation of a wide-area control

system.

– Figure (left) shows the performance of the controller with two different inputs, active power and voltage angle difference.

– Though this performance is not identical to that observed in simulations, it indicates that the real-time implementation of the algorithm was successful.

• Issues: Scaling, Signal to Noise Ratio, Amplifiers, Pre-processing of PMU data, communication delays– The damping signal generated by the hardware controller was captured on an

oscilloscope and is presented in Figure (right)

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