Integration of a wind farm into the utility grid

Document Sample
Integration of a wind farm into the utility grid Powered By Docstoc

        Eric ANDRIEU, Electrical Design Department Manager
        Pierre PESNEL, Export Manager
                                            18 – 20 October 2006
Thank you
for welcoming us
in Jamaica !
             What will we talk about?

 Who is VERGNET today ?

 Our experience in the Caribbeans

 Grid connection & Protection
  plan of wind farms

 Scada System
                                THE VERGNET GROUP
 Created in 1989

 100% private

 2 plants in France

 More than 90% of turnover abroad

 By history and culture, VERGNET’s
  focuses in cyclonic and isolated areas.

 A new product range, the GEV MP
  (275 kW)
                    Vergnet in the Caribbean
                      Guadeloupe :
                      • 17 people, dedicated to O&M
                      • 10 wind farms / 5 locations
                      • > 20 MW
                      • 50 GWh / year

• 4 wind turbines
• 1,1 MW
Vergnet in Guadeloupe
    > 10 % of the island’s energy

    Electric solutions with EDF

    Maintenance « in the vicinity of the
     wind Farm »
                              Vergnet in the Pacific
                              New Caledonia :
                              15 people, dedicated to O&M
                              7 wind farms / 4 locations
                              More than 25 MW installed power
                              50 GWh / year produced

 Fidji Islands :
 1 wind farm under construction
 Commissionning: Q1/2007
 37 WTG, 10 MW, very cyclonic
  In the Pacific :
 New projects in progress
The anti-cyclonic GEV MP – 275 kW
      Original technological solutions
                     GEV MP
A light original architecture
         55 m or 60 m hub height
         26 to 32 m Two-Blades rotors
         Pitch regulated
         Teetering Hub
         Down Wind
         Guyed Tilting Tower
        Very small foundations:
            15m3 concrete
            anchored on micro-piles
        Asynchronous generator, 2 speeds
        Flexible, then earthquake resistant

Adaptation to Island’s contexts
Hurricane protection

   The WTG can be tilted down into
  protection position.

   Same position is used for
  assembly and maintenance.
Landscape integration
      Adapted Logistics
 The GEV MP is lighter than other
  turbines of the same size
 All parts fit in 20’ and 40’ containers
 Installed with usual trucks and 25
  tons cranes
 Nacelle with blades: 8.7 tons
  Tower : 12 tons
Very light Civil Work

       Per Wind Turbine :

        9 drillings, 6’’ diameter, for
         the anchorages

        Approx 15 m3 concrete
    Easy maintenance
 Maintenance performed from the

 Blade cleaning in the ground at each

 No need for a special crane to
  change heavy components
Simple electrical works
     Each WTG features a shelter, for
         WTG control
         LV/MV transformer
         Cos Phi control

     MV cables in trenches link the
      WTGs to the dist. substation

     An optic fibber links all WTGs to
      the control room and the Scada
Grid Connection & Protection plan
What is an efficient grid connection ?
     - Respect the power quality of the grid
     - Respect the grid protection plan
     - Allow control and clear monitoring

                              Grid Integration Analysis
  - To assess the impact of connecting the wind farm to
 the grid

 - To define the setting of the MV protection at the PCC
Preliminary datas
• From Utility
   - R = minimum network short-circuit resistance at the PCC
   - X = minimum short-circuit reactance at the PCC
   - Max permitted voltage fluctuation in steady state and switching
   - Max permitted frequency fluctuation
   - Max permitted flicker type 1 & 2

 • From Turbine Manufacturer :
     DEWI report (Compliance with the IEC 61 400-21)
     Flicker, Active and Reactive Power, Harmonics, etc…
Step 1
Check connection possibility at chosen location

      - Impact on grid Steady state voltage fluctuation
            - MV : +/- 7%
            - LV : + 6% / - 10%

      - Load flow analysis
            Max admitted current in the existing grid

From those data, EDF :
      - Request grid adaptation
      - Gives budget offer
Step 2
Detailed analysis

- Transient Voltage Fluctuation
     Drop voltage caused by the transformer connection
     When the Wind farm produces P 0,2 and Q 0,2

- Flicker in continuous operation (type 1) and switching
operation (type 2)

     - Type 1: Pst = Plt = c(fi,v) x Sn/Scc
     - Type 2:
            Pst = f (N10, Kf, Sn, Scc)
            Plt = g (N120, Kf, Sn, Scc)
Step 2
Protection plan
                                     Wind farm protection

                                            Isetting < 0,8 I_earth _fault (safety
  General electrical protection of          condition)
         the Wind farm
                                            Isetting > 5 to 8 Ib (to avoid untimely
 fault in the                               Isetting >1,3 Im (to avoid untimely
 wind farm                                  tripping)

                                            Isetting >1,2 I_short_circuit_tri_wtg
                                            (to avoid untimely tripping)
Step 2
Protection plan
                                    Grid protection

 General electrical protection of
        the Wind farm
                                         - To avoid islanding network
                                         (Umax-min, Fmax-min, Vo)

                                         - To avoid wind farm production in
                                         case of grid fault
fault on the                                    - via Vo for earth fault
public grid                                     - via Umin for short circuit
Electrical DESIGN
                    The conclusions of the grid
                    integration analysis allow us
                    to design the electrical part
                    of the Wind farm :

                    • MV substation
                    • WTG parameters
                    • SCADA system
sequential connection to avoid drop voltage
WTG parameters (PLC)

Programming of the PLC to reduce type 2 flicker :

               Pst = f (N10, Kf, Sn, Scc)
               Plt = f (N120, Kf, Sn, Scc)

 Parameters set according to EDF requirements.
Supervisory Control And Data Acquisition

   • Adjustment of U max, P max, Q max at PCC to meet EDF
Remote access SCADA
       Via the public phone line. The communication is based on remote
       access (Windows access Virtual Private Network) . The
       communication had been optimized to reduce the volume of data
       (25 kbyte/s is required)

Dispatch permanent communication
        Via permanent radio communication or equivalent.
        Full duplex transmission of key data (metering – setting) :
                -P, Q, U, CB position
Some SCADA screen shots
Park overview
Substation overview
Monitor (on line data of each GEV MP)
Metering GEV MP
Average power and wind speed report.
Daily energy report

Thank you for your attention

Shared By: