DESIGN AND CONTROL OF VOLTAGE REGULATORS FOR WIND DRIVEN SELF EXCITED INDUCTION GENERATOR (original) (raw)
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International Journal of Electrical and Computer Engineering (IJECE)
Self-Excited induction generators (SEIG) display a low voltage and frequency regulation due to variable applied load and input rotation speed. Current work presents a simulation and performance analysis of a three-phase wind-driven, SEIG connect to a three-phase load. In addition, an investigation of the dynamic operation of the induction generator from starting steady state until no-load operation. It is assumed that the input mechanical power is constant where the rotor of the SEIG rotates at a constant speed. The value of the excitation capacitance which is necessary to the operation of the induction generator also computed to ensure a smooth and self-excitation starting. The output voltage of the generator is adjusted by varying the reactive power injected by STATCOM. A 3-phase IGBT voltage source inverter with a fuel cell input supply is connected as STATCOM which is used to compensate for the reduction in the supply voltage and its frequency due to variation occurred in the ap...
Voltage control of an isolated self-excited induction generator using static synchronous compensator
Journal of Renewable and Sustainable Energy, 2013
Voltage fluctuations due to random load variation are amongst the most important power-quality problem in a self-excited induction generator (SEIG) and wind energy conversion system. This paper presents a comprehensive modeling analysis and control strategy of a three-phase cage induction machine used as a self-excited induction generator. The proposed load voltage control strategy is based on the action of the static synchronous Compensator (STATCOM) which can not only provide the necessary reactive power but also may enhance the load ability. Moreover, a feed forward control method for the STATCOM is introduced and applied for controlling the SEIG's terminal voltage by using an outer control loop. An inner loop was also used to control the STATCOM's output reactive power to achieve the regulation of the AC bus voltage during load variation. To achieve this objective, we have designed and introduced an RST inner loop controller. To demonstrate the effectiveness of the proposed RST controller, a comprehensive set of simulation results are presented and thoroughly discussed in comparison with those of two other classical controllers, namely, the proportional-integral controller and the integral-proportional controller. V C 2013 AIP Publishing LLC. [http://dx.FIG. 3. Block diagram of the control scheme for STATCOM based voltage regulator for a SEIG system.
In this paper, a mathematical model of the Self-Excited Induction Generator (SEIG) is developed to analyze the operation of it in wind energy systems. In such type of wind scheme often whole generating system is isolated from the grid and supply electricity to the remote communities. A wind energy system usually a low/medium speed projects driven by controlled/uncontrolled micro wind turbines. The single point operation of these generators is realized; in such a manner that speeds, voltage, currents of generators remain constant under various operating loads conditions. The Electronic Load Controller (ELC) is modeled here for the controlled operation of WES against various load condition. Here the proposed electrical system are modeled and simulated in MATLAB using Simulink and Sim Power System (SPS) set toolboxes and different aspects of the proposed system are studied. On the basis this model different characteristics of SEIG with ELC are analyzed which shows its suitability in wind energy systems.
STATCOM-based voltage and frequency regulator for stand-alone asynchronous generator
International Journal of Power Electronics, 2014
This paper presents a STATCOM-based voltage and frequency regulation for stand-alone asynchronous generator feeding linear and nonlinear loads. The SEIG have inherent poor voltage and frequency regulation. The voltage and frequency depend upon the load current and power factor of the load with fixed excitation capacitor employing unregulated turbines. The changing consumer load requires variable reactive power compensation for excitation requirement. Consumer load contains harmonics and performance of SEIG is largely affected by these load harmonics. A current controlled voltage source inverter working as STATCOM is used for harmonic elimination, load balancing and variable reactive power compensation. A DC chopper with dump load is connected across DC bus capacitor to regulate varying consumer load. The control algorithm has been first co-simulated with processor in the loop (PIL) and then experimentally validated. The transient behaviour of developed prototype system for application and removal of balanced, unbalanced, nonlinear load is investigated.
PWM-based Controller of Output Voltage for Wind- Driven Individual Self-Excited Induction Generator
Indian Journal of Science and Technology, 2016
Background/Objectives: The objective of this research owes to propose a fixed voltage controller for wind energy based individual Self-Excited Induction Generator (SEIG). The ideology is that simple as to exploit the use of a voltage source inverter, employing with the fundamental principle of PWM technique that in corporate an individual battery source for the smooth operation. Methods/Statistical Analysis: The incidence of depressed voltage regulation because of the unexpected alteration in the speed and the load is one of the main demerits of the SEIG. In order to overcome this complicated situation, a modification of phase shift in the sinusoidal PWM is introduced, which standardizes the voltage of SEIG, when it is subjected to unexpected alteration in the load. Findings: It is likely to attain a fixed value of voltage when the load is altered from empty load to the complete load. The simulation of the presented scheme has been carried out by MATLAB/SIMULINK modeling. The consistency of the proposed model is determined by the outcomes of the prototype testing. Application/Improvements: By varying the modulating index of the voltage source inverter, the stabilization of output voltage for SEIG has been achieved. One of its major advantages is that by simply checking the dc link voltage, the characteristics of the current state can be predictable.
Bulletin of Electrical Engineering and Informatics
Self-excited induction generators (SEIGs) are used in wind turbine system because of high reliability, rigidity, simple structure, and capability to work under severe badly operating conditions. This type of generator has a poor terminal voltage and frequency regulation during changing the connected loads due to the absence of constant excitation current. Therefore, it is essential to stabilize the generated voltage and frequency besides suppress the injected harmonic current components. In this work, the dynamic performance of SEIG with distribution static series compensator (DSSC) is analyzed. The DSSC based on neuro-fuzzy controlled (NFC) is applied to control both voltage and frequency to enhance the regulation of SEIG. The NFC is used to control the DSSC which leads to balance the requirement of the reactive and active power of stand-alone grid under load variation and attempts to obtain a constant terminal voltage. The model is simulated using MATLAB/Simulink. The NFC structur...
STATCOM based voltage-frequency regulation for SEIG driven by an uncontrolled speed turbine
International Journal of Power and Energy Conversion, 2009
This article presents the analysis and the control of a stand-alone self excited induction generator (SEIG) intended for rural applications. SEIG along with the STATCOM with battery energy storage (BES) in its DC side makes it possible to control the terminal voltage and frequency during rotor speed and load variation. Constant frequency control is carried out by the load angle 'δ', without rotor speed control, while constant terminal voltage control is achieved via the modulation index 'm'. The 'SEIG' magnetisation characteristic and the 'STATCOM' rating are taken into consideration to determine the load interval where the terminal voltage and frequency can be controlled. The simulation results show good performances of the SEIG-STATCOM system under different perturbations.
Voltage Regulation of Wind Induction Generator
viXra, 2014
This project focuses on how to reduce the voltage variations, on a self -excited induction generator, which is caused due to variations in load. A real time model of such a circuit is simulated using MATLAB/Simulink and the changes in voltage for many different resistive loads are recorded. The voltage control is achieved adding series capacitors. This control strategy is implemented using MATLAB/Simulink.
IEEE Transactions on Energy Conversion, 2014
The performance of a system consisting of a three-phase self-excited induction generator (SEIG) with static compensator (STATCOM) for feeding static resistive-inductive (R-L) and dynamic induction motor (IM) loads was investigated. The cost-effective STATCOM providing stable operation was designed by connecting additional shunt capacitance with the load. The STATCOM-controlled algorithm was realised by controlling the source current using two control loops with proportional-integral (PI) controller: one for controlling the SEIG terminal voltage and the other for maintaining the DC bus voltage. The SEIG-STATCOM performance was studied for two designs of STATCOM, namely costeffective STATCOM and full-rating STATCOM. The cost-effective SEIG-STATCOM system with the proposed control scheme exhibited improved performance with respect to starting time, voltage dip, generator current and total harmonic distortion under various transient conditions.
International Journal of Engineering Research and Technology (IJERT), 2012
https://www.ijert.org/harmonic-analysis-and-performance-improvement-of-a-wind-energy-conversion-system-using-84-pulse-statcom https://www.ijert.org/research/harmonic-analysis-and-performance-improvement-of-a-wind-energy-conversion-system-using-84-pulse-statcom-IJERTV1IS9405.pdf This paper presents novel dynamic controller for the Static Synchronous Compensator (STATCOM) device to stabilize Stand-Alone Wind Energy Conversion Systems (SWECS) using an induction generator. The wind energy conversion system is connected to an electric load through an 84-pulse STATCOM, a flexible A.C. transmission systems (FACTS) device. The proposed strategy allows savings in the number of employed switches.The results demonstrated the effectiveness of the 84 pulse STATCOM device in stabilizing the wind energy conversion system by insuring effective harmonic reduction at generator/load bus voltage regulation and dynamic reactive compensation. This is modeled using MATLAB /SIMULINK software.