Principle of Operation
This document details the Operational Logic and the Definitions of Elements pertaining to the strategy for control logic executed in an OpenADR End Node that changes via Special 2.0b Signals and surrogates.
Analog output than can have a value of -100% (consume) to +100% (shed) from the PID loop which represents the correction required to attain Control Set Point.
Control Set Point
The value from which the PID loop calculates offset from the desired load to the actual Process Variable then provides a PID (Control Output) to the control elements (resources assigned to shed load or store). Example if kW should be limited to 150kW during an Event, 150 would be the Control Set Point.
The current value taken from a meter, inverter or charge controller that is the controlled medium or Pv in the PID loop. This could be kW, Frequency, kVAR, Volts and more.
Relay begins Event OFF. If the PID output exceeds the set point and the relay energized it will remain ON until the configured delay time is completed. Each time the PID output exceeds the set point the timer will reset.
Valid inputs are 0-32767 seconds
Relay begins Event OFF. If the PID output exceeds the set point and the relay energized it will remain ON until the Event is completed. This is set by giving the relay a long dead band. 32767 seconds is the largest valid input.
Signal Name is defined by OpenADR 2.0b Profile Specification Table 1 Signals and is used in combination with Signal Type and Signal Value map a specific control logic in the VEN.
Signal Type is defined by OpenADR 2.0b Profile Specification Table 1 Signals and is used in combination with Signal Name and Signal Value map a specific control logic in the VEN.
Signal Values will either increase or decrease the load consumption. They can be Integers, Floating Point, Percentage, Positive or Negative numbers. These Signals can be used for direct load control by mapping these general instructions to specific load control logic in the VEN without the VTN needing to know precisely what device may be consuming the signal.