Power Decomposition Control Scheme for Stator-Controlled DFIG Applied in Fractional Frequency Transmission System

This paper proposes a power decomposition control strategy for stator-controlled doubly-fed induction generator (SC-DFIG) applied in fractional frequency transmission system (FFTS). FFTS is a low-frequency power transmission method. Existing studies have not proposed a responsive control method for SC-DFIG system applied in FFTS. To address this gap, the power decomposition control strategy proposed in this paper effectively decouples and independently controls the active and reactive output power of the SC-DFIG system. The control system not only leverages the characteristic advantages of SC-DFIG applied in FFTS, but also exhibits a fast and stable response with high disturbance rejection under the proposed control strategy. The effectiveness of the control strategy for the SC-DFIG is validated through simulations and experiments. The experimental verification was conducted using a rapid control prototyping (RCP) setup implemented on the dSPACE MicroLabBox platform. The simulation and experimental results of a 1.0 kW SC-DFIG are presented under various speed and power reference values.