AES Buffalo Gap Wind Farm Buffalo Gap 2 - 232.5 MW 155 – GE 1.5 sle - PowerPoint PPT Presentation


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AES Buffalo Gap Wind Farm Buffalo Gap 2 - 232.5 MW 155 – GE 1.5 sle


AES Buffalo Gap Wind Farm Buffalo Gap 2 - 232.5 MW 155 GE 1.5 sle Presented August 22, 2008 By Robert Sims AES Wind Generation AES Buffalo Gap Wind Farm AES ... – PowerPoint PPT presentation

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Title: AES Buffalo Gap Wind Farm Buffalo Gap 2 - 232.5 MW 155 – GE 1.5 sle

AES Buffalo Gap Wind FarmBuffalo Gap 2 - 232.5
MW 155 GE 1.5 sle
  • Presented August 22, 2008
  • By
  • Robert Sims
  • AES Wind Generation

AES Buffalo GapWind Farm
  • Three Phases totaling 524.3 MW
  • Summary
  • Located in Taylor and Nolan Counties SW of
  • Buffalo Gap 1 67 Vestas V-80, 1.8 MW turbines
    totaling 120.6 MW, COD late/05
  • Buffalo Gap 2 155 GE 1.5 sle, 1.5 MW turbines
    totaling 232.5 MW, COD early/07
  • Buffalo Gap 3 74 Siemens 2.3 MW turbines
    totaling 170.2 MW, COD mid/08.
  • Interconnected to AEP Bluff Creek at 138 kV via
    project owned 12 mile 138 kV T/L.

AES Buffalo Gap 2
  • GE 1.5 sle Wind Turbine
  • Physical characteristics Rating
  • Three blades, rotor diameter of 77 M (253 ft.),
    swept area 4657 sq meters (50,128 sg. ft.)
  • 80 meter tubular steel tower (262.5 ft.)
  • Variable speed operation, main rotor 10-20 rpm
  • Power regulation via adjustable blade pitch
    (electric) electronic generator torque control
  • Main gearbox ratio 178 for variable generator
    speed of 870 to 1600 rpm with nominal power at
    1440 rpm.
  • Rated 1.5 MW and 575 volts 3 phase
  • Over 5000 installed worldwide

GE 1.5 MW sle Turbine

GE 1.5 sle Turbine

GE 1.5 MW sle Turbine

GE 1.5 sle Turbine
  • Method of starting
  • When the wind in the area increases above the cut
    in speed (3.5 m/s) the turbine blades are pitched
    from feather to power and the wind begins to
    turn and accelerate the rotor. Once the rotor
    achieves operational speed of 10-11 rpm the
    turbine is softly connected to the line with a
    ramp up of the power electronics.
  • Method of controlling power output
  • Output power is regulated through a combination
    of variable blade pitch for control of rotor
    torque, and variable frequency control of the
    generator to control drive train speed and
    torque. During a wind gust the rotor frequency
    is increased and the drive train is allowed to
    accelerate while reduging torque to store the
    gust power spike as kinetic energy in the rotor
    like a flywheel. Once the gust passes the
    controller extracts the power in the rotor and
    slows it back to the nominal speed.
  • Method of stopping
  • For normal shutdown the rotor blades are pitched
    to feather. For an emergency shutdown the blades
    are pitched to feather (battery back-up if
    required) and a disk brake is engaged on the high
    speed shaft.

GE 1.5 sle Turbine
  • Reactive Devices as Part of the Turbine
  • The GE 1.5SLE 60Hz wind turbine uses a power
    converter system that consists of an electronic
    converter connected to the generator rotor, a DC
    intermediate circuit, and a power inverter on the
    grid side. This system functions as a
    pulse-width-modulated variable frequency
    converter in 4-quadrant operation.
  • The converter its self consists of an insulated
    gate bipolar transistor (IGBT) power module and
    the associated electrical equipment. Variable
    output frequency of the converter allows a
    rotational speed-module operation of the
    generator within the range of 870 rpm to 1600
  • The Standard GE 1.5SLE 60Hz Wind Turbine is
    designed with a selectable power factor. At 1.0
    pu voltage (575 V) and full power (1500 kW), a
    power factor of 0.95 overexcited (reactive power
    delivered by the wind turbine) to 0.90
    underexcited (reactive power absorbed by the wind
    turbine) as measured at the terminals of the
    trubine. The power factor is settable at each WTG
    or controlled remotely and dynamically by the
    wind farm SCADA system (more on this later).
  • Optional Reactive Capability 0.90 overexcited /
    0.90 under-excited at 1.0 pu voltage (575 V) and
    full power (1500 kW) is available at an
    additional cost.

GE 1.5 sle Turbine
  • Grid Frequency Tolerance
  • Continuous operation in the frequency range of
    57.5-61.5 Hz.
  • Trips as the frequency drops below 56.5 Hz or
    exceeds 62.5 Hz.

GE 1.5 sle Turbine
  • Voltage Tolerance (At the 575 volt terminals of
    the turbine!)
  • Voltage limits for the GE 1.5 MW, 60 Hz wind
    turbine are as follows

AES Buffalo Gap 2
  • Site Selection Criteria
  • The Buffalo Gap project location was selected
    based on its high elevation resulting in high
    average wind speeds, rural location with
    compatible land use, and proximity to
    transmission lines.
  • Cabling Connections to collector substation
    Electrical characteristics
  • The GE turbines have a Padmounted type
    transformer located at the base of each turbine
    to raise the voltage from the 575 volt turbine
    terminal voltage to 34.5 kV for the site power
    collection system. A combination of underground
    and overhead power lines based on standard
    utility practices carry the power to the central
    step up substation. Typically 20-30 MW of
    generation is connected to each substation 34.5
    kV breaker positions.
  • Operational Issues
  • The only operational issues of moderate
    significance has been disturbances resulting from
    lightning strikes to overhead portions of the

AES BG 2 Control System
  • Location of Control Rooms / Facilities
  • The project has both local supervision control,
    along with remote supervision control 24/7 from
    the AES Wind Generation central control facility
    in Palm Springs, California.
  • The project has separate turbine SCADA systems
    for the 3 types of turbines associated with the 3
    phases of the project (Vestas, GE, Siemens)
    along with a separate SCADA system for the
    interconnection substations.
  • Turbine Power Control
  • Turbine power is generally controlled locally by
    each turbine individually to maximize energy
    capture. However, the local control can be
    overridden for the fleet by the turbine SCADA
    control and capped at lower max power levels.

AES BG 2 Control System
  • Reactive Control
  • Individual turbine reactive power is controlled
    centrally from the GE SCADA system. Voltage and
    power factor are monitored at the main collector
    substation. The system can operate on a voltage
    set point, or a power factor set point, and
    remotely adjusts the power electronic converters
    in each of the turbines along with automatically
    switching the 34.5 kV substation capacitor banks.
  • Switch / Breaker Control
  • Substation control can be local from the
    substation using either traditional control
    devices on the switchboard or a SCADA terminal in
    the substation control house, or remote
    supervision and control via the substation SCADA.
  • Special Protection Schemes (SPS)
  • The Buffalo Gap 3 project is being fitted with a
    short term SPS to reduce generation in the event
    of the loss of one of the 345 kV lines to Bluff
    Creek during maximum wind power generation. This
    SPS will be required for a few years until area
    transmission improvements are completed.