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This paper presents a Field Programmable Gate Array (FPGA) implementation of a direct sliding mode current control of a synchronous machine. Due to their robustness to parameters variations and external disturbances, sliding mode controllers are widely used for the control of electrical drives. The main interest of using FPGAs to implement such controllers is the very important reduction of the execution time delay. This time reduction derives directly from the possibility offered by FPGAs to design very powerful dedicated architectures. As a result, the quality of the regulated current is quite similar to the one performed by an equivalent analog control. Numerous experimental results are given in order to illustrate the efficiency of FPGA-based solutions to achieve high performance control of electrical drives.

This paper deals with the sliding mode control of a doubly-fed induction generator. The controller synthesis, based on a dynamical equivalent circuit representation of the machine, is presented. Then, its robustness against parametric variations of the system is evaluated and compared to the results obtained with a linear control scheme. The controller is finally validated by experimental results.