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Title: Improved Controller Design of Grid Friendly™ Appliances for Primary Frequency Response

The Grid Friendly$$^\textrm{TM}$$ Appliance~(GFA) controller, developed at Pacific Northwest National Laboratory, can autonomously switch off the appliances by detecting the under-frequency events. In this paper, the impacts of curtailing frequency threshold on the performance of frequency responsive GFAs are carefully analyzed first. The current method of selecting curtailing frequency thresholds for GFAs is found to be insufficient to guarantee the desired performance especially when the frequency deviation is shallow. In addition, the power reduction of online GFAs could be so excessive that it can even impact the system response negatively. As a remedy to the deficiency of the current controller design, a different way of selecting curtailing frequency thresholds is proposed to ensure the effectiveness of GFAs in frequency protection. Moreover, it is also proposed to introduce a supervisor at each distribution feeder to monitor the curtailing frequency thresholds of online GFAs and take corrective actions if necessary.
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Conference: IEEE Power & Energy Society General Meeting, July 26-30, 2015, Denver, Colorado, 1-5
IEEE, Piscataway, NJ, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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Country of Publication:
United States