Monitored Unit and System Governing Response to Large Frequency Changes following Loss of Generation in Normal Operation System

Two electric utility control areas independently adapted existing system data collection software to capture the response of the units within their several utilities' generation before, during, and after the loss of large blocks of generation [ranging from 1000 MW to 2200 MW] during periods of otherwise normal operation. These measurements are essentially unannounced tests of the governing response of the units and of the system response to frequency changes. The results have been examined with knowledge of the primary frequency control systems to provide evidence of the effects of the primary frequency control systems. The two operating areas were AEP (American Electric Power) and NYISO (New York IndependentXSystem Operator); both are members of the US-Canadian Eastern Interconnection (EI). AEP was and is a member of the NERC (North American Reliability Council) and of NERC's ECAR (East Central Area Reliability Council). NYISO was and is a member of NERC and of NERC's NPCC (Northeast Power Coordinating Council). At the time of the measurements AEP had approximately 24,000 MW of installed generation, and NYISO had approximately 33,000 MW of installed generation. This paper is one of several that have evolved from the work of the IEEE PES Task Force on Large Interconnected Power System Response to Generation Governing.