6.1.1.3
Power Factor Requirement and Low Voltage Ride Through Analysis for
Wind Generation Plants
Power Factor (“PF”) and Low Voltage Ride Through (“LVRT”) analysis will be performed to
determine the requirements for a new Wind Generation Plant according to FERC Orders
661/661-A and Appendix G of the pro forma GIA. MISO will use the following methodology in
determining the final requirements as determined during the System Impact Study.
i.
To determine the PF requirements for a Wind Generation Plant, MISO will model each
Wind Generation Plant at unity PF at the Point of Interconnection (“POI”) (no reactive
capability). If voltage criteria violations at the POI exist, then MISO will enforce the
criteria laid out in FERC Orders 661/661-A.
ii.
A Wind Generation Plant must be able to remain online during select system
disturbances. To test the LVRT capability of a Wind Generation Plant, MISO will
evaluate the plants’ performance for the following faults:
a. Three phase faults with normal clearing
b. Single Line to Ground faults with delayed clearing
If violations are found, the Interconnection Customer will be required to submit updated
LVRT settings to ensure that the LVRT threshold is maintained at the POI. The Wind
Generating Plant will be required to remain online for the specified time intervals.
6.1.1.3
Power Factor Requirement and Low Voltage Ride Through Analysis
for Wind Generation PlantsTurbine Generator
PThe power Ffactor (“PF”) and Low Voltage Ride Through (“LVRT”) analysis will be performed
to determine the power factor requirements for a new wWind turbine Ggeneration Plantor
according to FERC Orders 661/ 661-A and Appendix G of the pro forma GIA. MISO will use the
following methodology in determining the final requirements as determined during the System
Impact Study.
iii.
To determine the PF requirements for a Wind Generation Plant, MISO will model each
Wind Generation Plant at unity PF at the Point of Interconnection (“POI”) (no reactive
capability). If voltage criteria violations at the POI exist, then MISO will enforce the
criteria laid out in FERC Orders 661/661-A.
iv.
A Wind Generation Plant must be able to remain online during select system
disturbances. To test the LVRT capability of a Wind Generation Plant, MISO will
evaluate the plants’ performance for the following faults:
Formatted: Numbered + Level: 1 +
Numbering Style: i, ii, iii, … + Start at: 1 +
Alignment: Right + Aligned at: 0.25" + Indent
at: 0.5"
Formatted: Indent: Left: 0.5"
c. Three phase faults with normal clearing
d. Single Line to Ground faults with delayed clearing
If violations are found, the Interconnection Customer will be required to submit updated
LVRT settings to ensure that the LVRT threshold is maintained at the POI. The Wind
Generating Plant will be required to remain online for the specified time intervals.
For the purpose of this analysis, the reactive power limits for a wind turbine generator will be set
at 0.95 leading power factor at the Point of Interconnection and voltages will be monitored in the
local area under N-1 conditions. If the wind plant causes a criteria violation, the Local Balancing
Authority’s power factor requirements may apply. Further analysis will be performed to
determine if modeling the wind turbine generator at its inherent reactive power capability at the
POI, as provided by Interconnection Customer, would resolve the issue. If no voltage criteria
violation is observed, the wind turbine generator will not be subject to any power factor
requirements. However, the wind turbine generator shall be required to maintain the voltage
schedule, at the POI, based on the Transmission Owner’s criteria .
Formatted: Numbered + Level: 1 +
Numbering Style: i, ii, iii, … + Start at: 1 +
Alignment: Right + Aligned at: 0.25" + Indent
at: 0.5", Tab stops: Not at 0.5"
Formatted: Indent: Left: 0.25", No bullets or
numbering, Tab stops: Not at 0.5"
Formatted: Numbered + Level: 2 +
Numbering Style: a, b, c, … + Start at: 1 +
Alignment: Left + Aligned at: 0.75" + Indent
at: 1"