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access icon free Adaptive super-twisting sliding mode control of three-phase power rectifiers in active front end applications

© The Institution of Engineering and Technology
Received 02/10/2018, Accepted 20/03/2019, Revised 07/02/2019, Published 29/03/2019

A robust control approach for three-phase two-level grid-connected power converters using an adaptive super-twisting algorithm (ASTA) is studied. A cascaded structure of the proposed control method is employed, which consists of two control loops, the dc-link capacitor voltage regulation loop (outer loop) and the grid phase current tracking loop (inner loop). In the outer control loop, a proportional controller using technique is considered, which is designed to regulate the dc-link capacitor voltage to some desired value. An extended state observer used to asymptotically estimate the external disturbance is integrated into the outer control loop. For the inner control loop, two ASTA-based controllers are implemented that force the grid phase currents to their desired values in finite time. Lyapunov analysis is provided to show the finite time convergence of the closed-loop system. With the help of ASTA, a priori knowledge of the upper bounds of the derivative of the disturbances is not required. Illustrative simulation results in comparison with the linear proportional–integral control method are provided to demonstrate the effectiveness and robustness of the proposed ASTA, in the presence of load variation and parametric uncertainty.

Inspec keywords: control system synthesis; Lyapunov methods; nonlinear control systems; power grids; observers; power convertors; voltage control; closed loop systems; robust control; variable structure systems; electric current control

Other keywords: grid phase currents; inner loop; inner control loop; control loops; grid phase current tracking loop; desired value; three-phase two-level grid; proportional controller; outer loop; active front end applications; three-phase power rectifiers; closed-loop system; adaptive super-twisting sliding mode control; super-twisting algorithm; robust control approach; dc-link capacitor voltage regulation loop; outer control loop; linear proportional–integral control method; ASTA-based controllers

Subjects: Voltage control; Power convertors and power supplies to apparatus; Control of electric power systems; Nonlinear control systems; Stability in control theory; Current control; Multivariable control systems; Control system analysis and synthesis methods

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