EMS controls

Question 1

List various EMS control functions

Answer 1

Grid tied (PQ) function, Grid forming (VF) function, local dispatch, remote dispatch, PFR, FFR, AVR droop control, AVR PI control, cap bank control, time shifting mode, deman charge management, energy arbitrage, ramp rate control, clipped energy capture function, feeder load control, PF control, import/export control

Question 2

Disptach control sequence flow

Answer 2

Control functions (PQ) –> rate limiter (limit charge/discharge ramp rates) –> power factor function (adjust reactive power Q command to achive PF setpoint) –>POI compensation (account for power losses) –> distribution

Question 3

Define AVR droop control

Answer 3

The Automatic Voltage Regulator (AVR) - Droop Control function implements a traditional droop based controller for response to voltage deviations (this implementation is based on the UL 1741-SA definition).