Control of the powerquality for a DFIG powered by multilevel inverters

This paper presents a new nonlinear control for the overall model of a three-blade horizontal axis variable speed wind turbine (VSWT) including mechanical and electrical parts, with the aim of improving its performance and making it more profitable. The proposed control is an extension of the classical sliding mode control (SMC) by converting its sliding surface into a sliding sector. The classical SMC approach is widely used for nonlinear systems due to its stability against parameter variation, it is robustness against modeling uncertainties, its good results against external disturbances, and its ease of implementation in real time. Unfortunately, the SMC has a major drawback related to the chattering phenomenon. This phenomenon is due to the utility of a higher switching gain in the case of large uncertainties, it causes high-frequency oscillations once the sliding regime is reached, and it can cause a loss of accuracy by influencing the input control variables. This is the reason that aims to develop a new control law to eliminate the chattering and to guarantee stability, which is demonstrated by the Lyapunov theory. The effectiveness of the developed control is compared with the SMC and is illustrated by numerical simulations using MATLAB toolboxes.

“…The second is that the q-axis of the Park's reference is aligned with the stator voltage. These hypotheses will lead to the equations as in (2) [26], [27]. (2)…”

Section: Electrical Part Modelmentioning

confidence: 99%

Novel control strategy for the global model of wind turbine

El Fadili,

Berrada,

Boumhidi

2024

“…A three-phase, three level inverter [20], [21] is used to generate AC load voltage; Vc1 and Vc2 are voltage supplies for the inverter; they have same values as shown in Figure 4. Two middle diodes allow the output voltage to reach zero.…”

Section: Inverter Modellingmentioning

confidence: 99%

Fuzzy optimization strategy of the maximum power point tracking for a variable wind speed system

Belkacem

Bouhamri

Koridak

et al. 2022

Wind power systems are gaining more and more interests; in order to diminish dependence on fossil fuels. In this paper, we present a variable speed-wind energy global system based on a synchronous generator with permanent magnetic (PMSG). The major goal of this study is to track the maximum power that is present in the turbine. An examination of control methods to extract the MPPT point, from a wind energy conversion system (WECS) under variable speed situations is presented. An intelligent controller based on the fuzzy logic control (FLC) is proposed for regulating permanent magnetic synchronous generator (PMSG) output power, in order to improve tracking performance. The principle of this maximum power point tracking (MPPT) algorithm consists in looking for an optimal operating relation of the maximum power, then tracking this last. We simulated our system with MATLAB-Simulink software. The found results will be debated to elucidate performance of the global system.

“…Therefore, this strategy assumes that machine electromagnetic torque equals its reference 𝑇 𝑒𝑚−𝑟𝑒𝑓 regardless power. This is achieved by using adequate servo-speed to have reference electromagnetic torque in (10):…”

Section: Rotor Side Mppt Optimized Direct Controlmentioning

confidence: 99%

Optimized servo-speed control of wind turbine coupled to doubly fed induction generator

Mansouri

Krim²

2022

<p>Optimal control of any variable speed wind turbine needs maximum power point tracking (MPPT) coupled to doubly fed induction generator (DFIG) for better power generation. This paper offers a novel direct power servo-speed control of wind turbine. This latter is based on DFIG optimal hysteresis MPPT inverter current control combined with space voltage modulation (SVM) inverter voltage technique, thus providing a stable and continuous energy flow to power grid. In this design, the asynchronous machine stator is directly connected to the grid. Bidirectional power converter, acting as frequency converter, is rotor circuit located. Rectifier supplies rotor windings with voltages and reference frequency resulting from control procedure of the power exchange between the stator and grid. Inverter is directly controlled by means of SVM technique to maintain direct current (DC) bus voltage constant. Simulation results show that the proposed configuration improves power converters efficiency due that rotor circuit needs less power than stator circuit which is injected into the grid.</p>