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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK DFIG Wind Turbine Control System Co-ordination to improve Drive- Train Reliability Ting Lei 1, M Barnes 1, Sandy Smith 1 1 University of Manchester
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Overview Reliability of wind turbine subassemblies DFIG wind turbine model Basic control system Mechanical & electric torque oscillations Modified control schemes & protection circuit Improvement through control coordination
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK WT Subasembly Reliability
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK DFIG Wind Turbine – overall control system
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK PSCAD Set up –2-mass shaft model
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Converter Control System – RSC d – loop q – loop
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Converter Control System – GSC inner loop d – loop q – loop
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Mechanical Control System WT Controller
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Simulations with original controller 40% grid voltage drop for 0.5s Wind step from 12m/s – 13m/s ω r (pu) Pitch angle (degrees) Torque (pu ) Vdc (kV) ω r (pu) Torque (pu ) Vdc (kV)ir_abc (kA)
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Basic controller bandwidths coordination PWM: 4500Hz Grid f: 50Hz Shaft natural f: 2.55Hz GSC inner: 450Hz RSC current :10Hz DC-link: 10Hz Pitch controller: 0.01 0.1 1 10100 1000 Bandwidths (Hz) ?
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Controller bandwidths – pitch controller
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Basic controller bandwidths coordination PWM: 4500Hz Grid f: 50Hz Shaft natural f: 2.55Hz GSC inner: 450Hz RSC current: 10Hz Pitch controller: 0.1 Hz 0.01 0.1 1 10100 1000 Bandwidths (Hz) DC-link: 10Hz d-current:10Hz q-current:120Hz
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Controller bandwidths – RSC inner-loop RSC current controller d&q – 10Hz RSC d – 10Hz q – 120Hz ω r (pu) Torque (pu ) Vdc (kV)ir_abc (kA)
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Crow-bar protection Timed crow-bar applied for 0.4s Torque (pu ) Vdc (kV) ir_abc (kA) ω r (pu) Pitch angle (degrees) Minimum threshold crow-bar
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Controller coordination Torque (pu ) Vdc (kV) ir_abc (kA) ω r (pu) Pitch angle (degrees) Damping mode Damping controller setting
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Controller coordination Torque (pu ) Vdc (kV) ir_abc (kA) ω r (pu) Pitch angle (degrees) Damping mode Damping disabled during fault
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Power Conversion Group School of Electrical and Electronic Engineering The University of Manchester, UK Drive-train reliability can be deteriorated by torque ripples in –Wind speed changes –Grid fault A DFIG wind turbine model (PSCAD/EMTDC) is implemented for simulation, improvement is achieved by bandwidths coordination –RSC current-loop controller adjustment –Pitch controller adjustment Crow-bar protection and damping control coordination –Minimum threshold crow-bar –Damping control disabled during fault –Soft resumption of damping control after fault Future work – natural flux weakening, fast Pitch, different Winds Summary
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