Mamadou Lamine Doumbia

Output Power Maximization of a Permanent Magnet Synchronous Generator Based Stand-alone Wind Turbine

This paper proposes output power maximization control of wind energy system. A permanent magnet synchronous generator (PMSG) is used as a variable speed generator in the proposed wind energy system. In order to achieve the maximum power control of wind turbine across a wide range of wind speeds, a dynamic modeling and simulation of wind system with battery energy storage including wind disturbances is presented in this paper. This model should be able to support the analysis of the interaction between the mechanical structure of the wind turbine and the electrical load during different operational modes. These wind turbine concept models can be used and even extended for the study of different aspects, e.g. the assessment of power quality, control strategies, connection of the wind turbine at different types of grid and storage systems

Modeling of an islanding protection method for a hybrid renewable distributed generator

The Hydrogen Research Institute developed a hybrid renewable energy power system that uses a wind turbine, a photovoltaic array and a fuel cell. In order to connect this system to the grid, an islanding protection device is being developed. This paper presents the passive (U/O Voltage, U/O Frequency) and active (Sandia frequency shift and Sandia voltage shift) protection methods that were chosen to be added to the system. It also presents a Matlab/Simulink model of the protection device and the simulation results that were obtained using different critical operating conditions for which the clearing times can surpass those defined by the IEEE 1547 standard. Passive and active detection methods are combined in order to improve the efficiency of the islanding protection

Modelling and fuzzy logic control of DFIG based Wind Energy Conversion Systems

This paper proposes the modelling and control of Wind Energy Conversion Systems (WECS) based on Doubly Fed Induction Generator (DFIG). The fuzzy logic control is used to improve the extracted wind power. At given wind velocity, the mechanical power available from a wind turbine is a function of its shafts speed. Then, the rotor side converter (RSC) is controlled in the aim to follow the optimal torque for given maximal wind power. A new maximum power point tracking (MPPT) strategy based on the fuzzy logic controller was developed. Moreover, a new approach to estimate the speed from the measurement of the power is presented. The effectiveness of the proposed control strategies is validated by theoretical analysis and simulation carried out in Matlab/Simulink environment.

Simulink Modelling and Simulation of a Hydrogen Based Photovoltaic/Wind Energy System

This paper presents a dynamic simulation model using Matlab/Simulink software to study the behavior of renewable energy systems with hydrogen storage (RESHS). The complete system model is developed by integrating individual sub-units of the photovoltaic arrays, wind turbine, batteries, electrolyzer, fuel cell and power conditioning units. The sub-models are valid for transient and steady state analysis as a function of voltage, current, and temperature. Such a global model is useful for optimal dimensioning and effective control design of the RESHSs. The state of charge control method was chosen to validate the developed simulation models. The results confirmed previous experimental measurements on the test bench.

Development of a control method for a renewable energy system with fuel cell

The combination of an electrolyser, a fuel cell, a stack of batteries and renewable energy sources can provide peak power control in a decentralized/distributed power system. The electrolyser stores the off-peak energy as hydrogen and the fuel cell uses this energy to produce on-peak electricity, while the batteries are used to provide short term storage. This paper presents a complete control system that uses two DC/DC converters to control the operating power of the electrolyser and the fuel cell. We present the simulation results of PID controller and a fuzzy logic controller to manage the flow of energy in the system. The paper also presents the design of a boost converter that is to be used between the fuel cell and the DC bus.

An integrated solution for simulating electrical drive systems with Matlab/Simulink

Electrical drives are very complex systems which makes difficult their study when detailed analysis is required along with their global behaviour. With the help of advanced software tools for circuit analysis and the modelling of a drive system following a modular approach, it becomes much easier to study those complex systems. This paper presents a methodology for use with the Matlab/Simulink environment in which the main parts of an electrical drive are modelled as interlinked functional blocks. The complete drive system (from supply to mechanical load) is analysed as a set of independent but integrated modules.

An Active Anti-Islanding Algorithm for Inverter Based Multi-Source DER Systems

Islanding detection is an essential function for safety and reliability in grid connected distributed generation (DG) systems. Several methods for islanding detection are proposed, but most of them are not efficient for multi-source configurations, or they may produce important power quality degradation getting worst with DG penetration increasing. This paper presents an active islanding detection algorithm for voltage source inverter (VSI) based multi-source DG systems. The proposed method is based on voltage positive feedback theory. Simulations by MATLAB/Simulink/SimPowerSystems were used to evaluate its performance and its advantages concerning time response and power quality effects under critical conditions as loads unity power factor and high quality factor.

DSP-based sinusoidal PWM signal generation algorithm for three phase inverters

Generation of DSP-based patterns to control voltage source inverters substantially helped the development of modern electric drives used in various applications. Although the DSP control is well known, there are few papers that cover in detail the control signal generation methodology. This paper presents a DSP-based algorithm to generate sinusoidal PWM signals. The sinusoidal PWM generation algorithm is written in C language so it can be reused easily, in addition to the flexibility it provides in terms of changing the PWM switching frequency and the fundamental frequency of the inverter output voltage. The algorithm development methodology and the experimental results are presented. The output voltage and current harmonic spectra are compared for 5 kHz and 10 kHz carrier frequencies. The results show the effectiveness of the proposed algorithm. This work is part of a research project that aims to develop sensorless vector control of induction machines. This part is presented separately to document DSP based PWM algorithm development process.

Correlation technique investigation for islanding detection of inverter based distributed generation

Islanding detection is an important R&D topic in the area of distributed generation (DG) interconnection with utility grid. For many years, different anti-islanding protection methods were developed for inverter based distributed generation. However, most of these methods have limit capability for detecting islanding when multiple DGs have to be connected with one distribution line. This paper proposes an islanding detection method based on correlation technique. Analytical and simulation analyses of the correlation method are presented. Single and multiple DGs islanding detection schemes were investigated for different operating conditions including the most difficult one when the DG output power matches the local load power. The critical case-studies show that correlation method is effective for both single and multiple grid connected DG systems.

Control of wind turbine based on DFIG using Fuzzy-PI and Sliding Mode controllers

This paper presents the study of a wind energy conversion system (WECS) based on a doubly fed induction generator (DFIG) connected to electric power grid. The performances (reference tracking and robustness) of classical Proportional-Integral (PI), Fuzzy-PI and Sliding Mode (SM) controllers are compared with respect to the wind speed fluctuation and the impact on the produced energy quality. Moreover, direct vector control with stator flux orientation of the DFIG is used to control the active and reactive powers between the stator and the grid. The performances of the system were analyzed and compared by simulation using Matlab/Simulink/SimPower Systems.