Search

Your search keyword '"Denaï, Mouloud"' showing total 26 results
Start Over Author "Denaï, Mouloud" Publication Year Range Last 10 years
26 results on '"Denaï, Mouloud"'

15. A criterion for designing emergency control schemes to counteract communication failures in wide-area damping control

Author

Benasla, Mokhtar, Segundo Sevilla, Felix Rafael, Korba, Petr, Allaoui, Tayeb, Denaï, Mouloud, Benasla, Mokhtar, Segundo Sevilla, Felix Rafael, Korba, Petr, Allaoui, Tayeb, and Denaï, Mouloud

Abstract

Communication failures and transmission delays are two major issues associated with Wide-Area Damping Controllers (WADCs). While transmission delays have been extensively studied and various solutions have been proposed, little research has been done on communication failures and most of the proposed methods are based on preventive controls. However, in today’s liberalized electricity markets, preventive controls are no longer acceptable and the trend is to use emergency controls instead. This paper proposes a novel emergency control scheme to counteract the loss of remote signals related to the input and to the output of the WADC (i.e. sensor and actuator failures). The proposed scheme is based on a simple criterion, which overcomes the complexity of the previous methods. Modal analysis and time domain simulations are performed to verify the performance of the proposed method. The simulation results show that the proposed method performs well in handling communication failures and can maintain good damping performance. This research work is particularly important in view of the trend towards the wide-scale adoption of wide-area measurement technologies, while the vulnerability to cyber-attacks is increasing.

Published
2023

20. A Robust Control Approach for Frequency Support Capability of Grid-Tie Photovoltaic Systems.

Author

El Mehdi Ardjoun, Sid Ahmed, Denaï, Mouloud, and Chafouk, Houcine

Subjects
*MAXIMUM power point trackers, *PHOTOVOLTAIC power systems, *ROBUST control, *ENERGY storage, *DC-to-DC converters, *SYNCHRONOUS generators
Abstract

Distributed solar photovoltaic (PV) generation is growing rapidly around the world. However, unlike conventional synchronous generators, PV systems do not have any rotating masses to deliver inertia to support the grid frequency. The paper presents a detailed modeling of a new converter configuration and control scheme to enable PV systems to adjust the real power output and contribute to the grid frequency regulation. The proposed topology consists of a two-stage converter without an energy storage system. A DC-DC buck converter is used instead of a DC-DC boost converter, and this simplifies the control scheme which aims to keep the PV generator power in the right side of the P-V characteristic and can be varied in the range from near-zero to the maximum power. The proposed control scheme combines robust and nonlinear sliding mode theory with fuzzy logic. The PV system is connected to a low inertia microgrid and its ability to contribute to frequency regulation is assessed for different controls. The proposed converter and its control are validated experimentally on a 3-kW PV system using OPAL-RT real-time simulator and tested under varying temperature, solar irradiance, and partial shading conditions. The results show that with the proposed circuit, the operating point is always on the right side of the P-V characteristic irrespective of the operating mode. Furthermore, the proposed control scheme provides PV generators with a fast and effective inertial response to support the grid and enhance its stability during contingencies. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results