Wind Turbine Simulation (Phase IV) SDMAY Advisor: Dr. Venkataramana Ajjarapu

Group Members  Brian Alexander (Computer Engineering)  Lon Bromolson (Electrical Engineering)  Jarid Strike (Electrical Engineering)  Chase Schaben (Electrical Engineering) SDMAY 12-24

Project Description  Computer controlled motor is coupled with generator from wind turbine  Turbine power is used to drive inverter w/ AC load  Measurements are taken using DAQ USB-6008, and imported into LabVIEW SDMAY 12-24

Intended Use  Laboratory Environment.  Can be used for independent or for class purposes.  Can be operated by anyone with basic knowledge of circuitry. SDMAY 12-24

Major Changes  Last year’s system:  Batteries are voltage source  Wind turbine supplements power  Weak motor  New system:  Wind turbine provides voltage source  Batteries can be used as backup  PC provides user-friendly interface SDMAY 12-24

Last Year’s System SDMAY 12-24

 Functional Requirements  The turbine circuitry will generate a 24V DC output for any simulated wind speed  The turbine circuitry can supply 24V to any load variation up to 400 W  System is easy to use for average undergraduate student  Motor RPM can be set and maintained accurately SDMAY 12-24

 Non-Functional Requirements  The final project will include a user’s manual  The project will be documented through technical manual and in-depth schematics  Technology Requirements  LabVIEW interface must accurately calculate variables and display them for the user to see  All sensor and control equipment connected with LabVIEW SDMAY 12-24

Turbine Circuitry  Internal circuitry needs 7 VDC to operate  Battery must supply voltage to system  By removing this circuitry and using the 3-phase generator directly, the turbine can provide voltage. SDMAY 12-24

New System Model SDMAY 12-24

Feedback Systems  RPM Control  RPM is monitored  Slip is calculated  Voltage is adjusted to maintain low slip (1%)  Output Voltage Control  Output voltage is monitored  PWM duty cycle is adjusted to maintain output voltage (24V) SDMAY 12-24

Motor Issue  Previous motor could not provide consistent high- speed output without overloading/overheating  We replaced the 370W induction motor with an Ironhorse 1.5 HP induction motor  This required a new bracket to mount the motor SDMAY Figure from Wikipedia “File:VFD System.png”

SDMAY 12-24

New System Model SDMAY 12-24

Rectifier and Buck-Boost  Variable voltage/frequency 3-phase output from generator.  Rectifier converts to 1-phase DC output.  Buck-boost converter outputs compatible voltage levels to the inverter. SDMAY 12-24

MATLAB Model for Rectifier/Buck-Boost Circuit SDMAY Schematics 

Pulse-Width Modulation  Used to control switch in the buck-boost circuit.  Circuitry controlled by LabVIEW via NI-DAQ.  Varying switching frequency and duty cycle depending on the load.  Feedback duty cycle control SDMAY 12-24

Organization – Plexiglas Boxes SDMAY 12-24

Testing  Diode Rectifier  Clean DC signal sent to Buck-boost.  Buck-boost converter  Signal outputs desired voltage level.  PWM  Able to control the width of modulation.  Full System  All circuits interact correctly. SDMAY 12-24

Testing Process SDMAY 12-24

Final System SDMAY 12-24

Total Cost and Time Spent $175 – 1.5 HP Motor $70 – Coupling/Mounting $50 – Hardware $55 – Circuitry $350 – Total $500 – Budget SDMAY 12-24

Any Questions??