Feasibility of decomposing A~C~E~(1) to identify the impact of selected loads on CPS1 and CPS2

Control areas are held to the NERC's control performance standards (CPS), CPS1 and CPS2. A control area serving rapid and widely varying loads would like to know how load variations in certain subareas or zones affect its area's CPS1 and CPS2 measures. This paper addresses the question of decomposability of the 1-min average value of area control error (ACE) A~C~E~(1), the primary variable in the computation of CPS1 and CPS2, into components attributable to load fluctuations within defined zones. It includes description of dynamic models of ACE and A~C~E~(1), and simulated results confirming the decomposability of A~C~E~(1).