Siemens NetConverter® - ICCI

SiemensNetConverter®The enabling technology for the integration of windpower in the gridSales PresentationHakan YildirimConfidential / © Siemens AG All rights reserved.

Fixed speed turbines have a simple design, but aregrid unfriendlyConfidential / © Siemens AG All rights reserved.Page 2 July 2009 E R WP SP MK

DFIG machines enjoy variable speed operation andprovide some services to the grid• Double Fed Induction GeneratorRotormaincircuitbreakerMagnetizationfrequencyconverterGridTransformerStatormaincircuitbreakerMAsynchroniusor synchroniusrotor feedGeneratorGearboxRotorDFIG overview– Wound-rotor connected to a frequency converter scaled 30% of generator power– Stator directly connected to the grid– Converter scaled ~30% of generator power– Slip rings and brushes– ±30% variable speed operation– Grid support provided by power electronics and generatorConfidential / © Siemens AG All rights reserved.Page 3 July 2009 E R WP SP MK

Siemens NetConverter® decouples the generatorfrom the gridSiemens NetConverter® schematicsGearboxNetConverter®TransformerGRotorAsynchronousgeneratorMaincircuitbreakerGrid• Gearbox increases shaft speed to over 1,000 rpm (variable speed)• Asynchronous (induction) generator converts mechanical power to electricpower (AC)• Siemens NetConverter® provides power conversion and grid support– Generator-side converter converts variable-frequency AC to DC– Grid-side converter converts DC to grid-frequency ACSource: Siemens Wind PowerConfidential / © Siemens AG All rights reserved.Page 4 July 2009 E R WP SP MK

Grid codes start requiring wind farms to behave likeconventional power plantsCommon grid code requirementsPower qualityOperate within harmoniccontent and flicker limitsFrequency controlRegulate power output to adefined level or according tofrequency deviations 1)Low Voltage Ride ThroughWithstand low-voltage eventsfor several seconds withouttripping offVoltage controlRegulate reactive power inresponse to system voltagevariations 2)Notes:1) E.g. required in Denmark, Germany, Ireland, UK, Nordic grid code, etc.2) E.g. required in Denmark, Germany, Ireland, UK, etc.Source: Siemens Wind PowerConfidential / © Siemens AG All rights reserved.Page 5 July 2009 E R WP SP MK

Siemens NetConverter® enables the wind park toparticipate in the system frequency controlActive power controlPower output curtailment• Siemens NetConverter® offersmaximum flexibility for frequencyregulation– Power output curtailment to a setpoint or according to frequencydeviations– Ramp rate control– Delta control• Siemens wind parks can respond tosystem over-frequency and underfrequencyeventspowerpowerAvailable outputDeliveredoutputActive power reserveRamp ratecontrol(MW/minute)Delta controltimetimeSource: Siemens Wind PowerConfidential / © Siemens AG All rights reserved.Page 6 July 2009 E R WP SP MK

Siemens wind parks can support grid voltage andprovide higher customer valueReactive power control• Best-in-class solutions for voltage regulation– Wide power factor range– Dynamic reactive power capabilities– Reactive power control independent of active powerproduction– Reactive power control even at no wind• Reduced balance of plant costs by limiting orcompletely eliminating grid reinforcement devices atsubstation levelSource: Siemens Wind PowerConfidential / © Siemens AG All rights reserved.Page 7 July 2009 E R WP SP MK

Siemens NetConverter®: the enabling technology forthe integration of wind power in the gridConclusionsSiemens wind turbines not only produce power but also helpin reinforcing the gridThe Siemens NetConverter® features a wide range of availableoptions and parameters to comply with grid codesThe Siemens NetConverter® provides extra value to the client bysaving balance of plant costs, boosting revenues and reducing theturbine wear and tearConfidential / © Siemens AG All rights reserved.Page 8 July 2009 E R WP SP MK