WIND FARM Flexible AC Transmission Systems
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2 WIND FARM Flexible AC Transmission Systems WIND ENERGY AND GRID INTEGRATION Madrid January 2006 Jacques COURAULT
3 Assumption: Wind farm is with Fixed Speed Induction Generator (FSIG) SUMMARY 1/ Wind farm operation WITHOUT compensation: Single line diagram / main assumptions Physical aspects - System behaviour, Main factors on system behaviour, Simulations. 2/ Wind farm operation WITH DYNAMIC compensation: Single line diagram, Design, Simulations, 3/ Conclusion & cost mitigation 3 WIND ENERGY AND GRID INTEGRATION - Madrid January
4 Voltage (pu) 1 0,8 Operation area (no trip) Fault initial point 0,95 pu REQUIREMENTS P.O ,2 Fault recovery RED ELÉCT RICA DE ESPAÑA Fault duration Fig , Time (sec.) Ireactiva / Inominal (pu) 1 0,9 Fault & recovery Normal operation RED ELÉCT RICA DE ESPAÑA 0 (Supply by D-STATCOM) Fig 4.2 0,5 0,85 Generation of reactive Reactive consumption Voltage at grid connection point (pu) 4 WIND ENERGY AND GRID INTEGRATION - Madrid January
5 1 WIND FARM OPERATION WITHOUT COMPENSATION 5 WIND ENERGY AND GRID INTEGRATION - Madrid January
6 WITHOUT compensation / Single line diagram HV transformer 220 / 25 kv x=12% MV transformer 25 kv / 660 V x=5% FSIG HV line 220 kv High Pcc MV line 25 kv 20 km Wind Assumptions: induction, fixed speed generator, in principal, network arrangement, wind-farm power: from 30 to 50 MVA (approach in pu) 6 WIND ENERGY AND GRID INTEGRATION - Madrid January
7 Fault phase (phase 1) active energy / mechanical behaviour: WITHOUT COMPENSATION PHYSICAL ASPECTS During Fault Pmeca= Constant, Mechanical acceleration according to Inertia, Slip of induction generator is increasing, Torque at induction generator is decreasing (square of the voltage). Reactive current injection Generator Voltage > Network Voltage, Short time duration ~T s (opened rotor time constant). Recovery phase (phase 2) 1 2 High amount of reactive current. U network Iq Generator Speed or slip 7 WIND ENERGY AND GRID INTEGRATION - Madrid January
8 MAIN FACTORS ON SYSTEM BEHAVIOUR 8 WIND ENERGY AND GRID INTEGRATION - Madrid January
9 MAIN FACTORS ON SYSTEM BEHAVIOUR GLOBAL VIEW 9MW Wind Farm Simulation Scc 2500MVA at 120kV Bus Scc 55MVA at 25kV Bus 1 pu Voltage (pu) 3 phases voltage drop 0.2 pu Phase 1 Fault Time (sec) 9 WIND ENERGY AND GRID INTEGRATION - Madrid January
10 MAIN FACTORS ON SYSTEM BEHAVIOUR GLOBAL VIEW- SIX WIND TURBINES 25 kv Matlab / Simulink simulation from HQ 10 WIND ENERGY AND GRID INTEGRATION - Madrid January
11 MAIN FACTORS ON SYSTEM BEHAVIOUR SYSTEM PROTECTIONS AC Overcurrent (Inst) AC overcurrent (positive seq.) AC current imbalance AC undervoltage (positive seq.) AC overvoltage (positive seq.) AC voltage unbalance (negative seq.) AC Voltage unbalance (Zero seq.) Underspeed Overspeed 11 WIND ENERGY AND GRID INTEGRATION - Madrid January
12 Wind Farm Simulation WITHOUT compensation 9MW Wind Farm (With pitch control, pitch rate 2 /s) at wind turbine bus 12 WIND ENERGY AND GRID INTEGRATION - Madrid January
13 WIND FARM SIMULATION WITHOUT COMPENSATION PITCH CONTROL - SYNTHESIS 9MW Wind Farm (With pitch control, pitch rate 2 /s) With taken assumptions Fault duration 500ms protection levels Wind Farm won t trip with the help of pitch control DURING fault recovery High reactive power consumption during fault recovery untill pulling in. No respect of Fig 4.2 of P.O WIND ENERGY AND GRID INTEGRATION - Madrid January
14 2 - WINDFARM OPERATION WITH COMPENSATION 14 WIND ENERGY AND GRID INTEGRATION - Madrid January
15 WITH COMPENSATION - SINGLE LINE DIAGRAM HV line 220 kv High Pcc HV transformer 220 / 20 kv x=12% MV line 25 kv INTW IGEN MV transformer 20 kv / 660 V x=5% FSIG Wind 20 km D-STATCOM ID-STATCOM=INTW+IGEN Assumptions: identical to previous ones: induction, fixed speed generator, - in principal, network arrangement, - wind-farm power: from 30 to 50 MVA (approach in pu), in addition, D-STATCOM for compensation: - VSC equipment, - installed power in pu. 15 WIND ENERGY AND GRID INTEGRATION - Madrid January
16 9MW Wind Farm (with pitch control pitch rate 2 /s) at Wind turbine (D-STATCOM 19.5MVA ~2.16 p.u. ) Wind Farm Simulation With D-STATCOM 16 WIND ENERGY AND GRID INTEGRATION - Madrid January
17 WIND FARM SIMULATION WITH D-STATCOM 9MW Wind Farm (with pitch control pitch rate 2 /s) With taken assumptions With the help of 2.16 p.u of D-STATCOM, No reactive power consumption during fault and after recovery Respect of 1 p.u current injection at Pcc during fault 17 WIND ENERGY AND GRID INTEGRATION - Madrid January
18 3 - CONCLUSION & COST MITIGATION 18 WIND ENERGY AND GRID INTEGRATION - Madrid January
19 WITHOUT / WITH D-STATCOM 9 MW WIND FARM Without dynamic compensation With 19.5 MVAR D-STATCOM 2.5 s s Generator -13 MVAR 0.35 No respect of Fig 4.2 of P.O WIND ENERGY AND GRID INTEGRATION - Madrid January
20 WIND FARM WITH COMPENSATION CONCLUSION ASSUMPTION: Fixed Speed Induction generator case MAIN CONCLUSION: Case by Case study Network data - Impedance of Connecting transformer and line Wind turbine data: - type of active power and speed control - design for protection levels - Inertia Generator data - Curve Torque/slip - ratio sk/sn and Tek/Ten Huge amount of reactive power needed during faults 20 WIND ENERGY AND GRID INTEGRATION - Madrid January
21 WIND FARM WITH COMPENSATION COST MITIGATION ASSUMPTION: Fixed Speed Induction generator case Costs mitigation Power electronics VSC has a typical overload capability of Keeping our case study: SVS size = 1.15 p.u with x 2 overload capability To reduce costs: Splitting SVS in D-STATCOM and MSC Splitting SVS in D-STATCOM and TSC. / R D-STATCOM TSC Rough average price for 10 Mvar 1 M 2.5 time continuous for up 2 s 21 WIND ENERGY AND GRID INTEGRATION - Madrid January
22 10 Mvar peak 1 M. EXPENSIVE. BUT In normal operation the STATCOM May control cos φ May eliminate the negative sequence. Can be a active filter STATCOM VSC (PWM) Can be a dynamic damper. Just for cos φ and negative sequence, the simple SVC is a good solution. 22 WIND ENERGY AND GRID INTEGRATION - Madrid January
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