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In the case of doubly fed induction generator (DFIG), power electronics converter effectively decouples the inertia of the wind turbine generator from the power system. Hence, the increased penetration of DFIG results in higher frequency excursion and increased rate of change of frequency in the event of generation loss or increased load demand. This paper presents the added feature of frequency regulation...
Several techniques have been suggested to enhance the ability of multi-megawatt DFIG wind turbines to contribute in arresting system frequency decay and provide primary control power upon power imbalances. Among such techniques, the capability of temporary active power over-production was shown to be useful in limiting the initial frequency dip in hydro dominated systems. However, the excess active...
This paper deals with the application of enhanced phase locked loop (EPLL) technique for the voltage and frequency controller (VFC) in a stand-alone wind energy conversion system (WECS) using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The fundamental component of three-phase load currents is extracted using EPLL. The EPLL is also used for estimation of the frequency...
This paper deals with an implementation of an electronic load controller (ELC) using a digital signal processor (DSP) for regulating the voltage and frequency of an offgrid induction generator system (IG) that can supply electricity in remote areas of countries with high year-round rainfall. The proposed generating system consists of IG, ELC and nonlinear consumer loads. The ELC is combination of...
Doubly Fed Induction Generators (DFIG) has emerged as a suitable alternative for conversion of wind energy to grid quality energy under varying wind conditions. Often the control mechanism use large number of sensors and employ complex computations. Moreover, the reported control schemes for DFIG employing grid side converter (GSC) do not ensure a drawl of unity power factor (upf) sinusoidal current...
Three-phase self excited induction generator (SEIG) is increasingly getting attention for its use in distributed electricity generation and consumption viz wind, mini/micro hydro, biogas etc. The major advantage of induction generator over alternator includes its low cost, easy construction, ruggedness, maintenance free structure etc, whereas, varying demand of reactive power and poor voltage regulation...
An electronic load controller (ELC) is developed for an isolated asynchronous generator (IAG) to feed 3-phase, 4-wire consumer loads in a small hydro power generation system. This ELC consists of ac capacitors, voltage source converter (VSC) with a dc capacitor, a chopper, an auxiliary load at its dc bus, a star/hexagon transformer, consumer loads and it is implemented using synchronous-reference-frame...
Trendy wind based Energy conversion systems identified as Self Excited Induction Generator (SEIG) is an isolated power source, whose terminal voltage and frequency are controlled by varying speed, excitation capacitance or load impedance. Since load changes from time to time, the output parameters mostly are controlled by either speed or by varying excitation capacitance. This paper presents a method...
This paper deals with the modeling and control of a three phase four wire autonomous Wind Energy Conversion System (AWECS) using Doubly Fed Induction Generator (DFIG) feeding local loads. It presents a procedure for design and selection of the components and a vector control algorithm for AWECS. The proposed control algorithm for AWECS is realized using back to back connected Pulse Width Modulated...
This paper deals with dynamic performance of wind diesel system with variable wind speed turbine. The quality of power supplied to the autonomous system is improved by controlling the frequency to the rated value. To improve the system characteristics, a variable speed operative wind generator: Doubly-Fed Induction Generator along with diesel generator in the isolated hybrid system is used. The simulation...
The operational behaviour of a Remote Area Power Supply (RAPS) system consisting of a Doubly Fed Induction Generator (DFIG) as the wind turbine generator, diesel generator system, battery storage, dump load and mains loads is investigated in this paper. The diesel generator operates during low wind penetration or high load demand periods. Otherwise, the DFIG and battery storage are able to satisfy...
This paper deals with the implementation of a controller for an isolated wind energy conversion system (WECS) using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The reference source currents are computed using the power balance theory to control the voltage and frequency of WECS. Three-leg voltage source converter (VSC) with a battery energy storage system (BESS) is...
The increased penetration of wind power by doubly fed induction generator (DFIG) in power system results in higher frequency excursion and increased rate of change of frequency in the event of generation loss or increased load demand. This paper presents the added feature of frequency regulation capability of the DFIG by incorporating an extra frequency control support function, tested on an interconnected...
This paper deals with an electronic load controller (ELC) for a standalone induction generator (IG) used in small hydro power generation. The proposed ELC is used to control the voltage and frequency of IG. This ELC is realized using a non-isolated T-connected transformer and three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (VSC), a capacitor,...
This work deals with the operation and control of a wind turbine driven isolated asynchronous generator (IAG) system to feed three-phase four-wire consumer loads. The voltage and frequency controller (VFC) of IAG consists of a three-leg voltage sourced converter (VSC) and a battery energy storage system. A zig-zag transformer is used to provide the neutral terminal for three-phase four wire consumer...
Performance evaluation of an isolated wind/hydro electric generation scheme having variable speed 3-phase Self Excited Induction Generator (SEIG) operating in synchronism with a Generalized Impedance Controller (GIC) has been presented in this paper. The GIC is an impedance controlled operation of Pulse-width-modulated voltage source inverter (PWM-VSI). The performance of the SEIG-GIC integrated synchronized...
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,...
A novel Remote Area Power Supply (RAPS) system consisting of a Doubly Fed Induction Generator (DFIG) wind turbine generator, synchronous diesel generator system, battery storage system and a dump load is considered in this paper. A control coordination strategy is formulated with a view to regulate the system voltage and frequency within acceptable limits while extracting the maximum power available...
This paper investigates the grid support strategy of a VSC-HVDC link for the DFIG-based wind farm integration, including grid frequency regulation and power oscillation damping. The VSC-connected configuration may reduce the power system inertia with fast power control. In order to improve the power system stability with fast penetration of wind power generation, the control strategy of the VSC-HVDC...
Power system with high penetration of wind power requires a developed control strategy to obtain optimal dynamic performance under load variations. An algorithm utilizing internal model control (IMC) design method for the control of doubly fed induction generator (DFIG) operating at variable speed constant frequency is proposed. The proposed structure is a stand-alone generating system and feeds a...
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