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access icon free Analytical LVRT analysis of doubly fed induction generator with MPC-based DSCC/DRCC

© The Institution of Engineering and Technology
Received 13/01/2019, Accepted 15/07/2019, Revised 26/04/2019, Published 16/07/2019

Under the low-voltage ride-through (LVRT) of the doubly fed induction generator, extra efforts are required for the model predictive control (MPC)-based direct stator/rotor current controls (DSCC/DRCC) against the stator flux oscillation. Constant stator/rotor currents are maintained at the cost of rotor/stator current oscillations, respectively, due to stator flux oscillation. Necessity to incorporate the stator flux transient in the MPC-based DSCC/DRCC under the LVRT is analysed based on tracking effects of the current references. To quantify LVRT effect with the MPC-based DSCC/DRCC, analytical expressions of the stator current, rotor current and rotor voltage are proposed, whose accuracy is validated based on comparison with the time-domain simulations. On the basis of analytical study, advantages and disadvantages of the DSCC/DRCC are analysed considering impacts of the current oscillations on the security of the rotor-side converter. With the DRCC, rotor voltage increase is suppressed with damping to the stator flux oscillation and rotor current constraint is satisfied without decreasing stator output power; thus, the LVRT effect is desirable compared with the DSCC. The MPC-based DSCC/DRCC is extended to LVRT under the asymmetrical fault to realise effective control to both the positive and negative sequence stator/rotor currents.

Inspec keywords: power grids; machine control; electric current control; asynchronous generators; rotors; predictive control; reactive power control; stators

Other keywords: superior LVRT effect; MPC schemes; analytical LVRT analysis; stator flux transient; rotor-side converter; rotor voltage increase; low-voltage ride-through; rotor current constraint; stator output power; stator flux oscillation; current references; doubly fed induction generator

Subjects: Power and energy control; Control of electric power systems; Current control; Power system control; Optimal control; Asynchronous machines

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