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This paper presents the design and implementation of power converters for wind conversion systems. The power converter can not only transfer the power from a wind generator, but also improve the stability and safety of the system. The proposed system consists of a permanent magnet synchronous generator (PMSG), a DC/DC boost converter, a bi-directional DC/DC converter and a full-bridge DC/AC inverter...
This paper presents a sensorless control scheme for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) applications. The rotor speed is estimated using recursive least square estimation (RLSE) algorithm using a simple equation which requires only the knowledge of rotor flux. A programmable low pass filter (PLPF) is implemented to obtain the rotor...
There exists in Argentina a growing interest in alternative energy sources such as wind and solar energy for water pumping in remote areas. In this context, the main objective of the paper is to present and evaluate a configuration for an autonomous wind energy conversion system oriented to water pumping. It consists of a wind turbine with a wound rotor generator, electrically coupled with a squirrel...
A fifth order model of a doubly fed induction generator (DFIG) is proposed with stator flux orientation (SFO) vector control. Induction generator equipped with the as-built wind turbine scheme and grid system is modelled in MATLAB/SIMULINK. Different controllable parameters are identified. A control system is designed to improve the stability of the generator, which is connected with the back to back...
This paper proposes a ride-through technique of doubly-fed induction generator (DFIG) wind turbine systems. The control technique uses energy storage devices (ESD) which are controlled with current and power control loops. During grid faults, the generator output power can be reduced by increasing the generator speed, resulting in increased inertial energy of the rotational body. Also, the output...
Recent wind farm grid codes require wind generators to ride through voltage sags, which means that normal power production should be re-initiated once the nominal grid voltage has been recovered. This paper proposes a new control strategy using DFIGs (Doubly Fed Induction Generators) for stabilizing a wind farm composed of DFIGs and IGs (Induction Generators). Simulation analysis by using PSCAD/EMTDC...
This paper deals with an isolated wind-hydro hybrid generation system employing one Permanent Magnet Synchronous Generator (PMSG) driven by hydro turbine and another PMSG driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source...
This paper deals with an isolated wind-hydro hybrid generation system employing a Squirrel Cage Induction Generator (SCIG) driven by hydro turbine and a Permanent Magnet Synchronous Generator (PMSG) driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors...
This paper deals with a control algorithm for two parallel operated Doubly Fed Induction Generators (DFIGs) driven by wind turbines in a three phase four wire autonomous system feeding local loads. The proposed Autonomous Wind Energy Conversion System (AWECS) is using back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source converters (VSCs)...
The modeling of wind power plants incorporating synchronous generator and full-converters for using in power system simulations is presented in this paper. In other words, all components of the above-mentioned power plant using typical values as well as their corresponding control systems are in details modeled and also simulated. The control strategy of the variable-speed wind turbine is the maximum...
Recent advancement in size and technology of wind energy conversion systems (WECSs) require sophisticated control systems to effectively optimize energy conversion and enhance grid integration. Doubly-fed induction generators (DFIG)-based WECS are the most promising and widely utilized technology. This study focuses on advanced controls development to identify and assess the critical loads and instabilities,...
Method for wind turbine controller design and test in laboratory still remains a problem. This paper presents a realtime simulator of non-grid-connected wind energy conversion system suitable for controller design and test. The simulation model, which is composed of a fixed-pitch wind turbine, a permanent magnet synchronous generator with PWM voltage source vector control and DC-DC converter with...
This paper focuses on the super/sub-synchronous operation of the doubly fed induction generator (DFIG) system. The impact of a damping controller on the different modes of operation for the DFIG based wind generation system is investigated. The co-ordinated tuning of the damping controller to enhance the damping of the oscillatory modes using bacteria foraging (BF) technique is presented. The results...
Wind turbine systems (WTS) based on permanent magnet synchronous generators (PMSG) have been gaining more and more importance over the last years. In fact, these generators are self-excited, allowing operation at high power factor and high efficiency. Additionally, the elimination of the gearbox allows a reduction in costs and maintenance. To further reduce the system complexity and the maintenance...
In this paper, an operating strategy is suggested for the participation of variable speed, variable pitch wind generators (VSVPWG) in primary load-frequency regulation through pitch-control. The proposed strategy is mathematically precise and neither direct wind measurement as a control input, nor any linearization of the system are required. The above suggested are independent of the specific type...
The paper approaches the analysis of the performances of doubly-fed induction generators for grid-connected wind turbines by means of algebraic analytical relationships given by the mathematical model of the machine. These relationships are used to carry out a control strategy which aims to maximize the global efficiency of the generation system. Some considerations about the sizing of the rotor converter...
In induction wind generators, unbalanced three-phase stator voltages cause a number of problems, such as over-current, unbalanced currents, reactive power pulsations, and stress on the mechanical components from torque pulsations. The investigation develops a control method to increase the probability of successful grid fault ride through. In this paper, a novel control method for smoothening the...
This paper presents the design and implementation of power converters for wind generator (WG) controlled by a digital signal processor. The system is composed of a wind generator, lead-acid batteries, a DC/DC boost converter and a bidirectional DC/DC converter. The wind generator is the main power source of the system, and the battery is used for energy storage and power compensation to recover the...
A maximum power point tracking (MPPT) controller for variable speed wind energy conversion system (WECS) is proposed. The proposed method, without requiring the knowledge of wind speed, air density or turbine parameters, generates at its output the optimum speed command for speed control loop of rotor flux oriented vector controlled machine side converter control system using only the instantaneous...
This paper investigates the function of proposed dual- purpose DASM (Doubly-fed Asynchronous Machine) with emphasis placed on its ability to the maximum power tracking and to the stabilization of the power system including IG wind generators. P (active power) and Q (reactive power) compensation from DASM can be regulated independently through secondary-excitation controlling. Simulation results by...
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