Direct Power Control Based on Modified Sliding Mode Controller for a Variable-Speed Multi-Rotor Wind Turbine System Using PWM Strategy

Abstract

A robust and improved control scheme of a variable speed multi-rotor wind turbine (MRWT) system with a doubly fed asynchronous generator (DFAG) is displayed in this work. In order to improve the performances and effectiveness of the traditional direct power control (DPC) strategy of the DFAG, a new kind of sliding mode controller (SMC) called modified SMC (MSMC) is proposed. The most important advantage of the DPC-MSMC strategy is to reduce the power ripples and improve the quality of the currents provided to the grid. In addition, to control the rotor inverter, a pulse width modulation (PWM) technique is used. The proposed DPC-MSMC strategy was modeled and simulated using MATLAB/Simulink software. The simulation results showed that the ripples in stator currents, active and reactive powers and torque were considerably reduced for the proposed DPC-MSMC strategy compared to the traditional DPC. Additionally, the proposed DPC-MSMC method works excellently to reduce the total harmonic distortion (THD) of the stator current in the case of variable wind speed. On the other hand, a robustness test against parametric variations showed and confirmed the robustness of the proposed technique compared to the classical method.

Estimation of maximum non‐synchronous generation of renewable energy in the South Korea power system based on the minimum level of inertia

“…Recently, renewable energy sources have been used to control active and reactive power outputs using existing technologies and strategies [32][33][34][35][36][37]. However, the existing operational renewable energy sources in South Korea do not require this function at the time of connection.…”

“…A decrease in system inertia degrades the frequency stability by increasing the rate of change of frequency (RoCof) and degrading the frequency nadir [31]. Recently, renewable energy sources have been used to control active and reactive power outputs using existing technologies and strategies [32–37]. However, the existing operational renewable energy sources in South Korea do not require this function at the time of connection.…”

Predictive direct power control with phase‐locked loop technique of three‐level neutral point clamped inverter based shunt active power filter for power quality improvement

“…These control strategies differ in principle, simplicity, ease of implementation, cost, and durability. Several practical works dealt with the control of APF, [63][64][65][66] where two levels of APF were used in these works to simplify the proposed systems. These works showed that the control strategy has a major role in improving the quality of power and current together.…”

Experimental Validation of Feedback PI Controllers for Multi-Rotor Wind Energy Conversion Systems

“…The DPC and DTC strategies are among the most prominent linear control strategies used in the field of controlling electrical machines, especially in the field of renewable energies. These strategies depend on the use of a lookup table (LT) to regulate and control the operation of the inverter machine, and traditional controllers of the type hysteresis comparators (HCs) are used to control the characteristic quantities (Energy and Torque) [11]. Therefore, there are no complex calculations in these strategies that hinder their application to the systems.…”