Journal of Electrical Engineering : Volume 18 / 2018 - Edition : 2

Realization & HIL Testing of Wind Turbine Emulator Based on DTC Squirrel Cage Induction Motor Drive

Osama Mohamed Arafa
Mohamed Elsayed Abdallah
Ghada Ahmed Abdel-Aziz
electrical machines and drives
Direct torque control (DTC) is known to produce the fastest torque response in AC drives. In this paper, a wind turbine emulation (WTE) system using a squirrel cage induction motor (SCIM) working in a DTC mode is designed, implemented, and tested experimentally using Hardware-in-loop (HIL). The flux estimation is based on the current model where two stator currents and the rotor speed are measured. The DTC is realized using a space vector modulator to avoid variable switching frequency associated with the DTC switching tables. dSPACE Microlabox is used to handle the real-time control programmed in SIMULINK. Typhoon HIL402 is used to emulate the inverter, the machine, the connected mechanical load, and the feedback sensors of the current dc link voltage and speed. Thanks to the great flexibility offered by the HIL technique, a variety of tests has been conducted to validate the overall system performance. The tests include step change of load, step change of wind speed, operation under stochastic wind speed variation and torque-speed characteristics' of the emulated wind turbine at different feeds of wind speeds and coupled mechanical loads. Testing results verified the perfect fit of DTC in WTE application and the effectiveness of the HIL testing technique.
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