Patent ID: 7957845

Claim:
A method for controlling a power system control area during a plurality of consecutive automatic generation control cycles to ensure compliance with a first control performance standard at an end of a rolling first compliance period and compliance with a second control performance standard at an end of a second fixed compliance period, the method comprising: (a) determining a clock minute average for an area control error term during a plurality of past clock minutes; (b) determining a first control performance standard statistical measure from a beginning of the rolling first compliance period to a time at which the first statistical measure is determined, the first control performance standard statistical measure responsive to the clock minute averages for the area control error term; (c) determining a second control performance standard statistical measure from a beginning of the fixed second compliance period to a time at which the second statistical measure is determined, the second control performance standard statistical measure responsive to the cock minute averages for the area control error term; (d) determining a first area control error target responsive to the first control performance standard statistical measure; (e) determining a second area control error target responsive to the second control performance standard statistical measure; (f) determining a first control performance standard correction value responsive to the first area control error target; (g) determining a second control performance standard correction value responsive to the second area control error target; and (h) controlling the power system according to one or both of the first and the second control performance standard corrections values, wherein if both the first and the second control performance standard correction values are in a same direction controlling the power system according to a larger of the first and the second control performance standard correction values, wherein if the first and the second control performance standard correction values are in opposite directions controlling the power system according to the second control performance standard correction value.