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Demand Response (DR) Agent

Demand Response Diagram
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Challenge

Roof top units (RTUs) are ubiquitous and constitute a significant portion of the electric system peak; and most RTUs lack the proper infrastructure to be demand responsive.

Objective

Make RTUs grid responsive, leading to a more reliable electric power grid and to mitigate variable distributed renewable generation.

Implementation

DR agent supports pre-cooling, set point adjustments and fan speed changes. The set point changes will be gradual during pre- and post-event periods to reduce the peak demand.

Initial implementation supports time-of-use (TOU) and critical peak pricing (CPP) demand signals and can be extended to support control actions based on other signals (real-time prices, voltage regulation, frequency regulation, etc.). The agent will receive a DR signal from an external source, for example, an OpenADR server. Based on the external signal, the DR agent will modify the control sequence of the RTU. Each RTU will have its own DR agent and building occupants will have the ability to override participation and also customize comfort excursions – temperature limits during the DR event.

Inputs - DR signal from an external source.

Outputs - Modifies RTU control sequences by changing space set point temperatures, controls supply fan speed (if the fan has a variable-frequency drive), limits compressor staging.

Configuration Parameters - The configuration parameters for the DR agent include maximum and minimum zone temperatures during the event.

Application Results

Application Results
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