Comparative Study of Synergetic Controller with Super Twisting Algorithm for Rotor Side Inverter of DFIG

Abstract

This work presents the implementation of direct active and reactive powers control (DARPC) with nonlinear controllers (synergetic controller (SC) and super twisting algorithm (STA)) for the rotor side converter of doubly-fed induction generator (DFIG) connected to the multi-rotor wind turbine (MRWT) system, as an alternative to the DARPC technique with STA controllers. In this work, DARPC is based on the nonlinear controllers and space voltage vector technique. Modified space vector modulation (MSVM) technique is applied to compose fixed-switching-frequency DARPC strategy, which replaces the switching table and hysteresis comparators technique in classical DARPC technique. DFIG's mathematics model and the two control techniques are given, and the simulations of DFIG based on DARPC-SC and DARPC-STA are made separately by Matlab software. In this work, two tests are proposed in order to verify the behavior of the proposed strategies, where the comparison between the strategies is in several aspects such as current quality, traceability of references, robustness, and ripple ratio. Simulation results show that the strategy based on synergetic control is better in terms of response time, ripple ratio, and electric current quality compared to other strategies.

Fractional-Order Synergetic Control of the Asynchronous Generator-Based Variable-Speed Multi-Rotor Wind Power Systems

“…To estimate the Ps and Qs, we first need to estimate the stator and rotor fluxes, which are estimated according to Equation (26).…”

“…In addition, the author has used a modified SVM to generate the RSC control pulses. A comparative study between the SC and STA controllers was carried out in [26]. This study was done in terms of complexity, ease of use, durability, current quality, response time, and ripple ratio.…”