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Self-Excited Induction Generators (SEIGs) are increasingly used, in the distribution networks, as a key segment in the wind generation as Small Scale Embedded Generation (SSEG). The operation stability of stand-alone SEIG is constrained by the local load conditions, and that can be achieved by maintaining the load's active and reactive power at optimal values [1]. The changes in power are dependent...
This paper aims at the automatic reactive power control of an isolated hybrid power system. The system consists of a synchronous generator incorporated for diesel engine system and an induction generator incorporated for the wind energy conversion system. In order to minimize the surplus reactive power requirement of the system, FACTS device i.e., SVC is employed in the system. For robust voltage...
For remote area distribution networks, brushless generation systems have an edge due to their high reliability. Researchers have found dual stator winding induction generator (DSWIG) to be one of the suitable candidates for this purpose. This paper deals with a unique configuration of DSWIG, which facilitates simultaneous power flow through both the stator windings in extended speed range. Both the...
The induction machine operated as generator can be a very valuable alternative to the synchronous machines. Mostly in applications with lower nominal power ratings. In this case it can be more cost effective. Disadvantageous is a fact that induction machine cannot generate a reactive power and even more it is a permanent consumer of the reactive power. This paper strives to analyze possible application...
Dual stator winding induction generator, being brush-less and magnet-less, has been found to be suitable for remotely located wind-electrical systems where maintenance becomes a key issue. Since this generator has a squirrel cage rotor and two distributed stator windings, manufacturing process is simple and system becomes rugged. Both the windings may contribute active and reactive power when operated...
A bidirectional converter based battery control of a SPV (Solar Photovoltaic)-hydro based microgrid system is designed and its performance is simulated in detail. In the proposed standalone microgrid system, the battery capacity is reduced to the order of 50%, which makes the system reliable as well as cost effective. The proposed system is a hydro-PV based isolated microgrid. The proposed system...
Direct current (DC) connection of the large-scale wind generations with high voltage levels and long distance has been widely developed. Meanwhile, medium voltage direct current (MVDC) can also offer similar benefits compared to high voltage direct current connection of wind generations. This study presents a comparison study of MVDC and MVAC for the integration of distributed wind generations. The...
Renewable energy potential in the form of wind or micro hydro are available in abundance at rural locations far away from city habitat. To harness this green energy the rugged induction generator has come up as a viable option. However, induction generator has change in reactive power requirement with change in load. This dynamic reactive power requirement is proposed to be met by a DSTATCOM and thereby...
Enhancement of fault ride through capability of Doubly Fed Induction Generator (DFIG) is demanding issue in developed countries. In this paper crowbar circuit is implemented for limitation of fault current while the Adaptive Sliding Mode Controller (ASMC) & Adaptive Fuzzy controller (AFC) based on Levenberg-Marquardt algorithm is proposed to enhance fault ride through capability. The Adaptive...
Doubly Fed Induction Generator is especially used as wind power generators. This paper presents a control system which is based on neuro fuzzy because conventional PI controller based system does not operate satisfactorily as the operating point change. The proposed controller allows regulation in the active and reactive power efficiency. In this it takes the inputs as slip frequency, reactive power...
This paper presents the investigation of a self excited induction generator driven by a wind turbine and supplying an RL load. In this work, we focus to analyze a constant voltage-frequency operation mode. However, a pitch angle and an excitation capacitor control is needed to established a suitable operation mode. In order to improve robustness and to maintain at stable value the voltage and the...
This paper presents performance evaluation of three-phase induction generator operating as a grid connected single phase induction generator using electronic capacitor for variable speed wind energy applications. When the existing delta connected three-phase can operate as a single-phase induction generator by voltage control techniques using electronic capacitor. The proposed converter system for...
Developments in wind turbine technology are facilitating the increase of power generation capacity from renewable energy resources. The utilization of the squirrel-cage induction generator for wind power generation has some advantages over that of conventional synchronous generators. In this paper an induction generator model driven by wind turbine and connected to the grid is simulated in SIMULINK...
This paper presents a new control strategy for controlling the active power and reactive power of a Doubly Fed Induction Generator (DFIG) used in wind energy conversion systems (WECS). By controlling the load angle delta between the output voltage of the inverter and grid voltage, active power as well as reactive power of the grid can be controlled. Microcontroller NXP P89v51RD2 is used as a tool...
Wind farms are normally located far from the grid and, and may often experience islanding or weak gridconnection conditions. In such cases, the control system, which traditionally compensates the reactive power demanded by the generator, should take over the control of the voltage in order to stabilize the load bus voltage. In this paper, a new design of a PIbased controller is proposed to effectively...
Most of the pollution issues created in power system is due to the power quality problems like faults, harmonics etc. In this paper a grid connected fixed speed wind turbine induction generator subjected to asymmetric fault gets attenuated by unified power flow controller (UPFC) as it compensates the positive and negative sequence voltages thereby reducing the torque oscillations and improving the...
This paper presents the mathematical models of static Kramer induction generator (SKIG) that greatly improves its performance to be competitor for wind energy and hydraulic power generation. First, the effect of imposing negative voltage vector to the rotor at super synchronous speed is examined. Statorflux orientation (SFO) at rotor unity power factor (UPF) mathematical model is presented.
Self excited induction generators (SEIGs) are being increasingly called in service for renewable energy applications. They are incapable of generating reactive power and hence their reactive power is invariably supplied by capacitors connected across their magnetizing circuit. Therefore, the foremost design constraint of SEIGs is the evaluation of optimum excitation capacitance which fulfills their...
In this work, an implementation of DSTATCOM (Distribution Static Compensator) is discussed in distributed power generation system using composite observer based control technique. The proposed control technique is employed for fundamental components extraction of distorted generator load currents. Extracted these components are used estimation of reference source currents to generate gating signals...
Wind as renewable energy potential is abundantly available at remote locations. This can be harnessed by using the rugged induction generator. However there is a dynamic requirement of reactive power as the load changes. A DSTATCOM has been proposed in this paper to cater for the dynamic requirement of the reactive power for the Induction generator with the change in load and to stabilize the terminal...
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