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VÄRLDENS SKILLNAD

“Grid Code testing of Full Power Converter Based Wind Turbines Using back-to-back Voltage Source Converter System” EWEA 2013, Vienna Nicolás Espinoza , PhD Student, Chalmers University of Technology nicolas.espinoza@chalmers.se. VÄRLDENS SKILLNAD .

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VÄRLDENS SKILLNAD

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  1. “Grid Code testing of Full Power Converter Based Wind Turbines Using back-to-back Voltage Source Converter System” EWEA 2013, Vienna Nicolás Espinoza, PhD Student, Chalmers University of Technology nicolas.espinoza@chalmers.se VÄRLDENS SKILLNAD

  2. “Grid Code testing of Full Power Converter Based Wind Turbines Using back-to-back Voltage Source Converter System” • Introduction • Alternative approach of grid code for wind turbines • Grid code analysis regarding interconnection of wind turbines. • Simulation of existing testing setup: 4 MW FPC based WT connected to an 8 MW back-to-back VSC system, operated as a test equipment. • Control system for the wind turbine and test equipment are given. • Results shown the capability of the test equipment in controlling the voltage while handling short circuit currents. • Unique opportunity of field test of wind turbine using VSC system.

  3. Contents • Grid codes • Simulation models • Results

  4. Reactive Power Requirements • Normal operation range. • Example: • Strictest requirements: lagging power factor during upper limit of the normal voltage operation band.

  5. Active Power Curtailment • Active power output vs. system frequency • Example: • Different active power control requirements. • Overfrequency control in Danish grid code.

  6. Low Voltage Ride Through • Fault representation at the connection point • Example: • Different requirements for active and reactive power.

  7. Contents • Grid codes • Simulation models • Results

  8. Conventional Method • Impedance-based testing device

  9. VSC-Based Method • Overview of simulation setup and system modeling 4 MW Full Power Converter WT 8 MW Converter as Test Eq.

  10. Control Strategy for the WT model • Control overview for VSC • Inner current control • Outer active and reactive power control • DC voltage control

  11. Control Strategy for Test Equipment • Voltage Control: full controllability of the applied voltage • Amplitude • Phase angle • Frequency • Implementation

  12. Contents • Grid codes • Simulation models • Results

  13. Danish LVRT test.

  14. Conclusions • Comparison of different European grid codes: • Dependencies between voltage, frequency and reactive power. • Active power curtailment strategies against frequency deviation • LVRT profiles are compared in terms of strictness and reactive power management during the voltage dip. • Different approach of grid code testing. • Control strategies for WT and Test Eequipment. • Two representative case studies. • More reliable representation of grid.

  15. Upcoming Activities within the SWPTC • Laboratory setup at 100 kW / 400 V. • Field test at “Big Glenn” WT, programmed for autumn 2013. • Unique opportunity: Frequency test.

  16. Thanks for your attention Nicolás Espinoza, PhD Student nicolas.espinoza@chalmers.se CHALMERS UNIVERSITY OF TECHNOLOGY, Gothenburg, Sweden.

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