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access icon free Enhancing DFIG wind turbine during three-phase fault using parallel interleaved converters and dynamic resistor

© The Institution of Engineering and Technology
Received 23/12/2015, Accepted 21/04/2016, Revised 23/03/2016, Published 09/05/2016

Transient operations are very crucial for high power insulated-gate bipolar transistor modules, because high current and voltage are applied during this period for several microseconds. Therefore, the ability for doubly fed induction generator (DFIG) variable speed wind turbine power converters to withstand abnormal conditions is strictly imperative in order to achieve its lifetime specifications and also fulfil the grid codes. This study presents a new control scheme for DFIG wind turbine having parallel interleaved converters (PIC) configuration and a series dynamic braking resistor (SDBR) connected at its stator side. Interleaving the wind turbine converters in parallel configuration could help to increase the current capability, while the SDBR helps in post fault recovery of the wind turbine. The coordinated control analysis of the scheme was implemented in power system computer aided design and electromagnetic transient including DC simulation environment for a severe three-phase to ground fault. Results obtained were compared with the conventional DC chopper and crowbar rotor circuit protection scheme for the wind turbine. A better performance of the wind turbine variables were achieved using the proposed control scheme of the PIC and SDBR because the space vector modulation of the PIC results in maximum value of the change in common mode voltage, leading to improved switched output voltage of the voltage source converter leg.

Inspec keywords: power generation control; power generation faults; machine control; wind turbines; resistors; asynchronous generators; stators; power convertors; wind power plants

Other keywords: parallel interleaved converters; three-phase fault; space vector modulation; high power insulated-gate bipolar transistor modules; coordinated control analysis; voltage source converter leg; doubly fed induction generator; DC chopper; DFIG variable speed wind turbine power converters; dynamic resistor; electromagnetic transient; DC simulation environment; power system computer aided design; SDBR; common mode voltage; stator side; DFIG wind turbine enhancement; grid codes; switched output voltage; series dynamic braking resistor; crowbar rotor circuit protection scheme; PIC configuration; ground fault

Subjects: Control of electric power systems; Asynchronous machines; Wind power plants; Power convertors and power supplies to apparatus

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