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This paper analyzes the factors influencing the recovery process of a particular micro-grid (MG) following a short-circuit. The MG is supplied by a classical synchronous generator (SG), which performs the MG voltage regulation through its excitation system and by an induction generator (IG). The MG frequency is kept at a constant value by the use of dump load circuit (DL). Simulations are carried...
Aiming for the application in petroleum-heating field, an induction wind power generation system with graded capacitors and load is designed. The system is simple, reliable and low cost. Under variable generator speeds, the output voltage variation is controllable by switching the graded capacitors, and the output power is adjusted to guarantee the effective utilization of the wind power. The optimization...
The performance of three-phase Self-Excited Induction Generator (SEIG) with Static Synchronous Series Compensator (SSSC) is investigated to feed various static loads. The employed SSSC is a three-phase, Insulated Gate Bipolar Transistor (IGBT) based, PWM operated, Current-Control Voltage source converter (CC-VSC). The reference current to generate the gating signals is obtained by employing only one...
This paper describes the simulation model and the harmonics analysis of cascaded five level H-bridge inverters fed RL load and induction motor load system for stand alone applications. The SEIG fed H- bridge multi level inverter (MLI) for variable speed wind energy conversion systems are considered for various stand alone applications. In this paper, the SEIG fed cascaded five level inverters for...
Poor voltage and frequency regulation under source and load perturbations limit the use of self excited induction generator (SEIG) in isolated and dispersed generation, which can exploit wind/microhydro type renewable energy sources. In the present work, a Generalized Impedance Controller (GIC), which is a pulse-width-modulated voltage-source-inverter with a dc-link battery, is used to regulate both,...
This paper presents a simple control structure for the stand alone operation of Self Excited Induction Generator used to operate under variable loads. The proposed system uses PWM Voltage Source Inverter, DC-DC Boost Converter and diode bridge Rectifier with SEIG. The required reactive power for the Self Excited Induction Generator is supplied by means of a capacitor bank and the PWM converter to...
This paper deals with an integrated solid state controller (ISSC) for an isolated asynchronous generator (IAG) used in small hydro power generation for feeding three-phase four-wire loads. The proposed ISSC is used to control the voltage and frequency of IAG. This ISSC is realized using a three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (CC-VSC),...
Power demand increases continuously and it is not economical and reliable to fulfill the demand by thermal based generation methods. To overcome the problems of thermal based generation, use of non-conventional sources increases very rapidly. These sources are pollution free and economical but creating the problems while synchronization with synchronous generator. Compensating devices like STATCOM...
This paper deals with investigation on the performance of voltage and frequency controller (VFC) of a wind power generation using a capacitor excited isolated asynchronous generator (IAG) feeding dynamic loads. The amplitude of load currents is estimated using the low pass filter to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage...
An intelligent strategy for monitoring and control of a grid independent microgrid having an energy storage module, wind induction generator, and loads is presented in this paper. The goal for intelligent monitoring and control of the microgrid is to have real and reactive power control while regulating line voltage and frequency and thus maximizing the use of renewable resources. First, a conventional...
This paper deals with a decoupled electronic load controller (DELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The proposed DELC is used to control the voltage and frequency in the decoupled manner. The proposed decoupled electronic load controller is combination of a voltage regulator (VR) for regulating...
A novel hybrid Remote Area Power Supply (RAPS) system consisting of a Doubly Fed Induction Generator (DFIG) based wind turbine and a battery Energy Storage System (ESS) is investigated in this paper. The proposed RAPS system also consists of a dummy load and its controller. The battery energy storage system is used as a buffer which is connected to the DC link of the DFIG. The dummy load which is...
For doubly fed induction machines operating as wind generators (DFIG), the terminal voltage and the active power delivered to the grid are controlled by a PWM converter linked to the machine rotor. The monitoring of the direct and quadrature axis components of the rotor voltage makes possible the control of the terminal voltage and active power, respectively. Currently, this control is performed by...
The power demand is more than the generation and it is not economical & reliable to increase the generation by conventional sources. Day by day the use of non-conventional sources has been increased due to their economy and pollution free characteristics. This paper deals with the synchronization and stability of non-conventional source like Pico and micro hydro plant with thermal based synchronous...
This paper deals with the modelling and effect of Doubly Fed Induction Generator (DFIG) for wind turbines on transient stability analysis when connected to grid system. A reduced order model for the DFIG has been used. A controller for speed, voltage and power factor has also been implemented. The DFIG model and the controller are presented as Differential Algebraic Equations (DAE). A 7th order model...
This paper presents a design of an isolated star/hexagon transformer based ELC (electronic load controller) to regulate voltage and frequency of an isolated asynchronous generator (IAG) driven by a stand-alone uncontrolled pico-hydro turbine feeding three-phase four-wire loads. The proposed ELC is used to control frequency and voltage of IAG despite frequent change in consumer loads. Such an ELC is...
In order to optimise grid interaction, advanced control schemes for the power train of a railway traction vehicle operating at the 15-kV, 16.7-Hz-grid have to take grid interaction into account. To achieve a satisfying performance, advanced simulation tools as well as suitable laboratory experiments for verification are needed. This paper is focussed on a 16.7-Hz single-phase laboratory grid emulation...
The performance of double-fed induction generator (DFIG) is greatly affected by the parameter of magnetic inductance in both normal and abnormal condition of grid. In this paper, an additional control loop is added to achieve ideal cutting-in results with an imprecise parameter of magnetic induction. For verifying the proposed method the simulation results are presented in the paper.
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
The application of a doubly fed induction generator (DFIG) as a suitable generating scheme in a remote or isolated communities is presented in this paper. Remote area power supply (RAPS) system, a dummy load and its controller with energy storage system (ESS) are identified as the key components. The dummy load is used to absorb the power associated with over generation. The battery storage system...
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