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INTERNATIONAL CONFERENCE ON RENEWABLE ENERGIES AND POWER QUALITY (ICREPQ'06)

Universidad de Zaragoza. INTERNATIONAL CONFERENCE ON RENEWABLE ENERGIES AND POWER QUALITY (ICREPQ'06). Palma de Mallorca 5-7 April, 2006. The impact of induction generator and PWM Inverter with energy storage on weak grids.

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INTERNATIONAL CONFERENCE ON RENEWABLE ENERGIES AND POWER QUALITY (ICREPQ'06)

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  1. Universidad de Zaragoza INTERNATIONAL CONFERENCE ON RENEWABLE ENERGIES AND POWER QUALITY (ICREPQ'06) Palma de Mallorca 5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Hans Bludszuweit, José Antonio Domínguez and Miguel García CIRCE – University of Zaragoza

  2. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids 1) Simulation configurations • Reference system: Asynchronous induction machine (ASM) directly coupled to the grid • Study Case: Grid connection with DC-Link and energy storage 2) Definition of the grid strength 3) Results • 3-phase fault (at the PCC) • Voltage dip • Harmonic distortion

  3. Universidad de Zaragoza Weak Grid V ~ ~ P, Q Zth = R + jX Thevenin Impedance Infinite bus ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation configurations 1) Reference system: Asynchronous induction machine (ASM) directly coupled to the grid ASM Generator PCC

  4. Universidad de Zaragoza PCC ~ ~ ASM Generator Weak Grid ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation configurations 2) Study case: Connection with DC-Link and energy storage DC Bus Generator converter Grid converter Energy Storage System (ESS) Battery, UCap

  5. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation configurations 2) Study case: Connection with DC-Link and energy storage

  6. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Definition of the grid strength relative to the generation Renewable Penetration Level RPL: with: SASM: Nominal power of ASM generator SSC: Short circuit power of the grid at the point of common coupling (PCC)

  7. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results The following topics have been treated: • 3-phase fault (at the PCC) • Voltage dip • Harmonic distortion

  8. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: 3-phase fault (100, 150 and 250 ms) With DC-bus and ESS (RPL 50%) Direct coupling (RPL 25%)

  9. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: 3-phase fault (100, 150 and 250 ms) With DC-bus and ESS (RPL 50%) Direct coupling (RPL 25%)

  10. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: Voltage dip Simulated voltage-time curve at the PCC according to preliminary operational procedure proposed by “Red Eléctrica Española”:

  11. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: Voltage dip With DC-bus and ESS (voltage control mode) Direct coupling

  12. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: Voltage dip With DC-bus and ESS (voltage control mode) Direct coupling

  13. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: Harmonic Distortion (RPL 50%) Total Harmonic Distortion (THD) was determined at the PCC for RPL 50 %: • Current THD is limited by 4 mH inductivity: • before voltage dip: 1,15 % during voltage dip: 1,30 % • Voltage THD: • before voltage dip: 15 % during voltage dip: 42 %

  14. Universidad de Zaragoza ICREPQ'06Palma de Mallorca5-7 April, 2006 The impact of induction generator and PWM Inverter with energy storage on weak grids Simulation Results: Harmonic Distortion (RPL 50%) FFT – Analysis of the voltage Voltage wave form at PCC during a voltage dip Active filters are needed to eliminate the severe harmonic distortion when coupling PWM Inverters to weak grids.

  15. Universidad de Zaragoza INTERNATIONAL CONFERENCE ON RENEWABLE ENERGIES AND POWER QUALITY (ICREPQ'06) Palma de Mallorca 5-7 April, 2006 Thank you for your attention !

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