Planning & System Studies


Transient Stability Review

Analyzed transient stability of numerous nuclear, coal, combined cycle, combustion turbine and hydro units to demonstrate compliance with NERC TPL, MOD, FAC and PRC standards. Analysis also provided operational guidance for equipment and Relay outages. Mitigation strategies included limiting maximum MW output of units and temporary Relay settings. Technical guidance was also provided for potential closing angle issues.

Transmission Expansion Planning – Gas

Project consisted of performing short and long-term transmission planning studies and economic analysis to recommend the most cost effective transmission capital additions, while ensuring compliance with applicable NERC Reliability Standards.  These studies also included periodically coordinating approval of Transmission Capital additions among joint transmission owners within the State of

Georgia.Fault Induced Delayed Voltage Recovery -

Review of the North Georgia metropolitan area for susceptibility to Fault Induced Delayed Voltage Recovery for NERC Category C and D events. Analysis proposed different mitigation strategies including Relay settings changes, addition of redundant Relaying, installation of Independent-Pole Operated (IPO) breakers, and Under Voltage Load Shedding (UVLS) schemes to comply with applicable NERC TPL and PRC standards.  This study also provided short term mitigation strategies including temporary Relay settings requirements and Generation dispatch for all feasible system load levels and system configurations until long term projects could be implemented.

Out-of-Step Protection - Hydro Units

Study consisted of review of transient stability of several hydro units to provide settings for out-of-step protection for the units. The study provided the impedance trajectory expected during an un-stable swing as well as a stable swing. Relay settings were provided for a distance Relay that would trip for unstable swings and not trip for stable swings

Generator Interconnection Studies
Florida & Georgia

Studies included a review of the steady state (thermal and voltage), stability and short circuit impacts of numerous proposed generating units applying for interconnection agreements through the Large Generator Interconnection Procedures (FERC ORDER 2003 LGIP). Network upgrades analyzed to applicable NERC, Regional Reliability and transmission provider planning standards.Total

Transfer Capability Determination

Performed daily and monthly analysis to determine reliable Total Transfer Capability (TTC) levels for several ATC Paths. The analysis considered simultaneous interaction among several paths.  In addition, certain paths were required to be coordinated among entities of adjacent regions.

Generator Interconnection Representation

Represented and provided independent review of Feasibility, System Impact and Facilities Study results (thermal, voltage, short circuit, stability and required network upgrades) for generation developers’ Generator Interconnection Requests.


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