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Research on Control Method of Doubly Fed Induction Generator

Author: ChenQian
Tutor: WangDeYi
School: Xi'an University of Technology
Course: Proceedings of the
Keywords: Doubly-fed generator Control method Vector control Negative feedback PSCAD / EMTDC
CLC: TM31
Type: Master's thesis
Year: 2010
Downloads: 167
Quote: 0
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Abstract


Doubly-fed generator can achieve the VSCF run advantages of steady-state and transient operating performance , particularly suitable for wind power generation , variable head hydro and pumped storage power generation system . Appropriate control strategy generator able to play good regulating performance , flexibility and reliability of running key . This article is derived on the basis of a detailed analysis of the mathematical model and the basic characteristics of the doubly-fed generator vector control method for doubly-fed generator PSCAD / EMTDC environment simulation platform , with double- fed wind turbine detailed analysis the doubly-fed generator control grid voltage unbalance case simulation . The main work of this paper are as follows: the basic theory and the basic characteristics of the double-fed motor , derived vectors transform mathematical process , to build the mathematical model of the doubly-fed generator , summed up the relationship of energy conversion of the doubly-fed generator . Expounded the basic concepts of vector control , the basic principle of the stator magnetic field oriented vector control , is derived based on stator flux vector control generator power equation , to build a block diagram of the control system based on stator flux vector control strategy . Expounded the basic concepts and working principle of the double PWM converter , the network side of the three-phase PWM converter based on general mathematical model of the switching function is derived , and the grid voltage oriented vector control , the AC side input current is divided into the active component and the reactive component , respectively, to control the active and reactive components in order to achieve unity power factor control and DC link voltage control of the AC side . PSCAD / EMTDC environment to build a simulation system platform , complete simulation of the control strategy . Grid voltage unbalance motor and wind turbine harm doubly fed induction generator , for example , increase the negative feedback control , the original control strategy of the doubly-fed generator rotor side negative feedback to suppress electromagnetic oscillations network side to the negative feedback control of the target is inhibited the unbalanced current injected into the grid .

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,)
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