By Mohmoud Mossa
Lately, wind electrical energy platforms have become loads of cognizance in view that they're expense aggressive, environmentally fresh, and secure renewable strength resource compared with the fossil gasoline and nuclear energy iteration. a distinct form of induction generator, known as a doubly fed induction generator (DFIG), is used largely for high-power wind functions. they're used a growing number of in wind turbine purposes end result of the ease of controllability, the excessive strength potency, and the enhanced strength quality.This study goals to increase a mode of a box orientation scheme for keep an eye on either, the lively and the reactive powers of a DFIG which are pushed through a wind turbine. additionally, the dynamic version of the DFIG, pushed through a wind turbine in the course of grid faults, is analyzed and built, utilizing the strategy of symmetrical elements. eventually, this examine proposes a unique fault ride-through (FRT) power with an appropriate keep watch over method (i.e. the facility of the facility process to stay attached to the grid in the course of faults).
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Extra resources for Modeling, Analysis and Enhancement of the performance of a Wind Driven DFIG During steady state and transient conditions
C indicates that the generated active power matches the variation of the wind speed with fast and precise transient response. e. 1. There can be many causes for a voltage dip: short circuits somewhere in the grid, switching operations associated with a temporary disconnection of a supply, the flow of the heavy currents which are caused by the start of large motor loads, or large currents drawn by arc furnaces or by transformer saturation . The magnitude of a voltage dip at a certain point in the system depends mainly on the type of the fault, the distance to the fault, the system configuration, and the fault impedance.
This could be avoided by bypassing the thyristors with commutators, but the switching time of the commutators may be too slow and the system may not respond fast enough to a voltage dip. The higher ratings of the IGBT-s will increase the cost of the power converter, but this high current only take place during very short periods of time, and the cooling system doesn´t need un upgrade. 7: Series antiparallel thyristors for LVRT However, the application of the control method to DFIGs is not discussed.
No formal methodology for the design of the control systems and its enhancement during grid fault is presented and only simulation results are discussed. 19 In chapter 5, a novel FRT scheme is proposed to control and enhance the performance of a DFIG driven by wind turbine system during grid faults. In this scheme, the input mechanical energy of the wind turbine during grid fault is stored and utilized at the moment of fault clearance, instead of being dissipated in the resistors of the crowbar circuit as in the existing FRT schemes.