Generation Interconnect


IOU Out-Of-Step Protection For Hydro Units
Southeast Region

Study consisted of a review of the 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.

RRO Study Group Representation (SERC)

Represented the client’s interests on the SERC Near Term Study Group (NTSG) and the Eastern Interconnection Reliability Assessment Group (ERAG) by participating in coordinated study efforts for regional and inter-regional reliability assessments. This assessment involved performing voltage, thermal and transfer analysis to assess the amount of power that could be transferred among the SERC participants.

Total Transfer Capability Determination

Performed daily and monthly analysis to determine reliable Total Transfer Capability (TTC) levels for several ATC Paths. During the evaluation, it was also necessary to consider the simultaneous interaction among several paths. In addition, certain paths were required to be coordinated among entities of adjacent regions.

IOU Transmission Expansion Planning

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

IOU Generation Interconnect Studies
Multiple States   

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 were identified as applicable to remain in compliance with applicable NERC, Regional Reliability and transmission provider planning standards.

Nuclear Plant Protective Relays

Replacement of unit primary/backup Generator and GSU Protective Relays.

Fault Induced Delayed Voltage Recovery
North Georgia

Review of the North Georgia metropolitan area for susceptibility to Fault Induced Delayed Voltage Recovery for NERC Category C and D events. Study 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 addressed the operational time frame and provided short term mitigation strategies including temporary relay settings requirements and generation dispatch for all feasible system load levels and system configurations until the long term projects could be implemented.

Generator Switchyard Upgrade

Provided engineering for addition of 4-on-1 Combined Cycle Generator.  Switchyard was Modified from a 4 Position Ring Bus to an 18 Breaker, 6 Bay Breaker and a ½ Layout for 3 Generator lines, 2 Auxiliary Transformer lines, and 3 underground 230 kV transmission lines.

Generation Addition

Provided Protection & Control, Substation Engineering design, Project Management, and Testing & Commissioning for 8 MW Of Generation Addition.

IOU Transient Stability Review
Brookfield Renewable

Review of the transient stability of numerous nuclear, coal, combined cycle, combustion turbine and hydro units to demonstrate compliance with NERC TPL, MOD, FAC and PRC standards. Study 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.


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