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Generation Interconnection
PJM Impact Study Report
Revised
For
PJM Generation Interconnection Request
Queue Position Q55
Snowy Creek 138kV Project
March, 2012
© PJM Interconnection 2012. All rights reserved. 1 PJMDOCS-# 691313v1
Q55 System Impact Study Report
System Impact Study
Snowy Creek 138kV Generation Project
Introduction
This System Impact Study report provides the documentation of an assessment that has been
performed by PJM Interconnection, L.L.C. and FirstEnergy (FE) in response to a request made
by AES Wind, LLC for the connection of a 62.5 MW (12.5 MW Capacity) Snowy Creek 138kV
Wind Farm Generation Project to the MonPower Transmission System. AES Wind, LLC has a
proposed commercial operation date of June 2013 for the proposed Snowy Creek 138kV facility.
As per the PJM study process, the Snowy Creek 138kV Project assessment was accomplished
by: 1. Evaluating the reliability impact of the proposed facilities and connection on the
interconnected transmission system by the performance of a power flow study; 2. Ensuring
compliance with the NERC, ReliabilityFirst, PJM and FE Reliability Standards by identifying
the system reinforcements that will need to be installed for an interconnection of the proposed
project; 3. Coordinating and cooperating with the PJM staff and AES Wind, LLC by
participating in project meetings and issuing this report as a part of the PJM study process; 4.
Performing a Steady State, Short-Circuit and Dynamics Study as necessary; 5. Conducting all
studies in accordance with the PJM Manuals, the "FE Requirements for Transmission Connected
Facilities", and the "FE Study Guide".
Connection Facilities
In compliance with the PJM planning protocol, AES Wind, LLC has submitted a "System Impact
Study Agreement" to PJM and a proposed single line diagram that identifies its plan to construct
a Wind Turbine Generation Project on a property in Preston County, West Virginia, that is
approximately 3 miles from Snowy Creek substation. AES Wind, LLC reduced the size of the
project to a total capability of 62.5 MW (12.5 MW Capacity) on 3/1/2010. For purposes of this
report, it has therefore been designated as the Snowy Creek 138kV Project to reflect its
interconnection voltage and its proximity to Snowy Creek substation.
The interconnection of this project will be accomplished by expanding Snowy Creek substation
and installing 3-138kV breakers and associated facilities. A summary of the Snowy Creek 138kV
Project direct connection facilities is shown on Attachment 3. The one-line is shown in
Attachment 2.
© PJM Interconnection 2012. All rights reserved. 2 PJMDOCS-# 691313v1
Q55 System Impact Study Report
PJM Analysis Summary
This portion of this report was prepared by the PJM Interconnection Engineering staff. It
identifies the overloads and violations found on the Transmission system. These overloads are
addressed as required, later in this report with associated reinforcements and upgrades.
Network Impacts
The Queue Project #Q55 was studied as a 62.5 MW(Capacity: 12.5 MW) injection at Snowy
Creek substation in the FE area. Project #Q55 was evaluated for compliance with reliability
criteria for summer peak conditions in 2011. The load flow portion of this study assumes the
wind farm has the capability to maintain unity power factor at the collector bus of the wind farm.
Potential network impacts were as follows:
Generator Deliverability
(Single or N-1 contingencies for the Capacity portion only of the interconnection)
None
Multiple Facility Contingency
(Double Circuit Tower Line, Line with Failed Breaker and Bus Fault contingencies for the full
energy output)
None
Short Circuit
(Summary form of Cost allocation for breakers will be inserted here if any)
Contribution to Previously Identified Overloads
(This project contributes to the following contingency overloads, i.e. "Network Impacts",
identified for earlier generation or transmission interconnection projects in the PJM Queue)
None
Steady-State Voltage Requirements
(Results of the steady-state voltage studies should be inserted here)
None
Stability and Reactive Power Requirement for Low Voltage Ride Through
(Results of the dynamic studies should be inserted here)
To be determined.
New System Reinforcements
(Upgrades required to mitigate reliability criteria violations, i.e. Network Impacts, initially
caused by the addition of this project generation)
None
Contribution to Previously Identified System Reinforcements
(Overloads initially caused by prior Queue positions with additional contribution to overloading
by this project. This project may have a % allocation cost responsibility which will be calculated
and reported for the Impact Study)
© PJM Interconnection 2012. All rights reserved. 3 PJMDOCS-# 691313v1
Q55 System Impact Study Report
(Summary form of Cost allocation for transmission lines and transformers will be inserted here if
any)
None
Potential Congestion Issues
There are several wind generation plants proposed in the general area of the #Q55 project, each
with only 20% of their peak output level considered as a Capacity Resource, and the remaining
80% as an energy only resource. If all of the wind generation plants are at their maximum output
level simultaneously, a significant number of the transmission facilities, and many underlying
system facilities are likely to be overloaded, restricting operation to a lower output level.
PJM and the Transmission owner(s) studied the delivery of the energy portion of this
interconnection request. The following analysis has been performed to inform the
Interconnection Customer (Queue/Queues P&Q) of potential congestion issues (operational
restrictions) that may occur and affect the #Q55 project’s ability to operate at full output for
certain system conditions. The upgrades listed below are not required reliability upgrades for the
Queue #Q55 interconnection. Please note that the number of facilities identified below as
requiring upgrades is (may be) quite extensive with a number of these facilities requiring
reconductoring/rebuilding of transmission lines. Some of the reconductoring/rebuilding projects
can be done in a short time frame while others are quite extensive and will require a long time to
complete. In general, the time necessary to design and rebuild an extensive facility upgrade will
take approximately 2-3 years to complete. If the #Q55 Interconnection Customer wants to
pursue construction of any of these upgrades, a separate Transmission Interconnection request
must be submitted and the upgrades must be performed as merchant transmission projects.
Delivery of Energy Portion of Interconnection Request
PJM also studied the delivery of the energy portion of this interconnection request. Any
problems identified below are likely to result in operational restrictions to the project under
study. The developer can proceed with network upgrades to eliminate the operational restriction
at their discretion by submitting a Merchant Transmission Interconnection request.
Note: Only the most severely overloaded conditions are listed below. Thereis no guarantee of
full delivery of energy for this project by fixing only the conditions listed in this section. With a
Transmission Interconnection the conditions listed in this section. With a Transmission
Interconnection Request, a subsequent analysis will be performed which shall study all overload
conditions associated with the overloaded element(s) identified.
1. The South Bend – Keystone 500kV line (from bus 20118 to bus 11 ckt 1) loads from
101.0% to 101.7% (AC power flow) of its emergency rating (2595MVA) for the single
line contingency outage (AP132). This project contributes approximately 11.4MW to the
thermal congestion.
CONTINGENCY AP132
DISCONNECT BRANCH FROM BUS 20104 TO BUS 20115 CKT 1 /* CABOT
WYLIE RIDGE 500 500
END
© PJM Interconnection 2012. All rights reserved. 4 PJMDOCS-# 691313v1
Q55 System Impact Study Report
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