Algerian Journal of Signals and Systems

Control Scheme Influence on the Performance of Shunt Active Power Filter based on Five-level NPC Inverter in Steady and Transient Conditions

Salim CHENNAI — Sun, 31 Mar 2024 00:00:00 +0100

This paper presents an investigation on the performance of shunt active power filter (Shunt APF) systems based on five-level neural point clamped (NPC) inverter in steady and transient conditions adopting a fuzzy control scheme. The shunt APF is operated as a current source connected in parallel with the non-linear loads to inject compensates current harmonics into the AC source. The multi-level inverters have gained considerable interests in last year’s. Five-level inverter is recommended in medium and high voltage applications; their advantages are low harmonic distortions, low switching losses, low electromagnetic interference, low voltage stress of power semiconductors and low acoustic noise. Secondly fuzzy logic has been widely used in various industrial applications. To benefit from these advantages a shunt active power filter based on five-level (NPC) inverter using fuzzy control scheme is presented in this work. To identify the reference currents, synchronous detection method (SMD) is adopted. Proportional integral voltage controller is used to maintain the dc voltage across capacitor constant and reduce inverter losses. The simulation is performed using MATLAB-Simulink software and SIMPOWERSYSTEM toolbox. The obtained results in steady and transient states illustrate the performances and the effectiveness of the proposed shunt APF system.

Assessing Rotor Position Impact on the PMSM Perforamance and the Dynamic Simulation with Control Position for Wind Energy Conversion

ibtissam bouloukza, Hania Ladaycia , Fawzi Senani , Abderrezak Rahab — Sun, 31 Mar 2024 00:00:00 +0100

In this paper, two parts are presented. First for the design and dimensioning of PMSM machine, we must know the distribution of the magnetic field in each part of the magnetic system and in particular at the air gap in which the energy conversion takes place. Generally, Maxwell’s partial differential equations supplemented by material’s law are used to describe the magnetic field problems. However, a numerical calculation is necessary, especially with the complex geometry of these devices. Secondly, we develop a machine Park model in relative unit to simulate a simple closed loop control imposed on the position of the PMSM rotor used in the wind energy conversion chain and this control is used to define the phase voltage have enabled to evaluate the performance of the machine.

Stabilization of chaotic fractional-order Lu ̈ system using sliding mode control

Ms Sakina Benrabah, Samir Ladaci, Samir BENHADID — Sun, 31 Mar 2024 00:00:00 +0100

In this paper a fractional-order sliding mode controller (FOSMC) is proposed to control the chaotic fractional-order l’s system. Sliding mode control is a robust controller and its objective is to allo the system states to move to the sliding surface and remain on it. The stability analysis for the proposed control is performed based on the Lyapunov stability theorem. Simulation results show the ability of the proposed controller to improve the system performance.

Robust Observer-Based Controller Design for Constrained Takagi-Sugeno Systems

Sun, 31 Mar 2024 00:00:00 +0100

This work concerns a descriptor Takagi-Sugeno (T-S) fuzzy system. The system is subject to disturbances, sensor faults, the presence of unmeasurable premise variables, and input saturation which the latter are considered uncertainties of the system. First, the considered system is transformed into the polytopic representation, and then, a robust Proportional-Integral (PI) observer-based controller is designed. This observer-based controller, can estimate both the system states, and the faults, and stabilize closed-loop state trajectories. An integrated robust controller strategy is adopted by a novel structure of non-Parallel Distributed Compensation (non-PDC) control law. furthermore, the proposed approach expresses the stability conditions of controller design are expressed in terms of Linear Matrix Inequalities (LMIs) constrained optimization problem. Using LMI TOOLBOX in MATLAB, we can easily design the type PI observer for efficient robust state/fault estimation and solve the observer-based controller design problem of discrete-time T-S fuzzy systems. Finally, an application to a rolling disc process is given to illustrate the effectiveness of the proposed method.

A A comprehensive comparison of the two MPPT techniques (P&O, SMC) for photovoltaic systems

FADILA TAHIRI, Abdelkader HARROUZ, Gazi Erkan BOSTANCI — Sun, 31 Mar 2024 00:00:00 +0100

This paper aims to study the behavior of different maximum power point tracking (MPPT)
techniques applied to PV systems. In this work, we evaluate and compare perturbation and observation (P&O)
and sliding mode control (SMC) techniques. a DC/DC boost converter is used between the PV system and
load to transfer the maximum possible power. the conventional MPPT methods Perturb and Observe (P&O)
cannot detect and track the highest peak. Thus, this causes an important loss of power, so a technique is
suggested sliding mode control, which offers many benefits such as durability against parameter changes,
minimal current output distortion, and excellent reference tracking. The simulation results shown in MATLAB
confirm that the sliding mode control method allows to have a faster response compared to P&O, to reduce
the steady-state fluctuations and better track the maximum power point with fewer power losses.