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Mitigating the Effect of Latency Errors Between Remote HIL Systems

National Renewable Energy Laboratory

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Technology Marketing Summary

Several research institutions are pursuing virtually connected, large-scale energy systems integration testbeds through the use of remote hardware-in-the-loop (HIL) techniques. This is driven by the ability to share laboratory resources that are physically separated (often over large geographical distances) and include devices or systems that are too difficult to relocate or model. Researchers are now investigating ways to virtually connect multiple HIL experiments – consisting of both physical hardware and simulation at all multiple locations – by connecting experiments through a communication link between real-time processors. This approach, however, is currently limited by inherent computational and communication delays that exist in coupled remote systems, which results in decreased temporal resolution of the emulated system due to the Nyquist criterion.


NREL Power Systems Engineers have developed a method to mitigate the effect of latency errors between remote HIL systems. This is accomplished by embedded observer control algorithms. The proposed system can also be scaled to manage multiple interconnected systems with varying communication delays. Ultimately, the proposed invention can increase effective bandwidth of the system and provide a computed upper bound on the frequency spectrum of the simulation results.

  • Load estimation
  • Load balancing
  • Enables HIL testing at remote facilities
Applications and Industries
  • Grid optimization
  • HIL testing
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
ROI 16-31ProposedAvailable05/18/201605/17/2016

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To: Erin Beaumont<>