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A novel control solution for improved trajectory tracking and LVRT performance in DFIG-based wind turbines
AhmadHASHEMI,ChristianCONFICONI,AndreaTILLI
0
(The Center of Complex Automated Systems (CASY) at the Department of Electrical, Electronic and Information Engineering (DEI), \\University of Bologna, Risorgimento, 2, 40136 Bologna, Italy; Sama Technical and Vocational training College, Islamic Azad University, Kermanshah Branch, Kermanshah, Iran;The Center of Complex Automated Systems (CASY) at the Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, Risorgimento, 2, 40136 Bologna, Italy)
摘要:
This paper presents a new control strategy for the rotor side converter of Doubly-Fed Induction Generator based Wind Turbine systems, under severe voltage dips. The main goal is to fulfill the Low Voltage Ride Through performance, required by modern grid codes. In this respect, the key point is to limit oscillations (particularly on rotor currents) triggered by line faults, so that the system keeps operating with graceful behavior. To this aim, a suitable feedforward-feedback control solution is proposed for the DFIG rotor side. The feedforward part exploits oscillation-free reference trajectories, analytically derived for the system internal dynamics. State feedback, designed accounting for control voltage limits, endows the system with robustness and further tame oscillations during faults. Moreover, improved torque and stator reactive power tracking during faults is achieved, proposing an exact mapping between such quantities and rotor-side currents, which are conventionally used as controlled outputs. Numerical simulations are provided to validate the capability of the proposed approach to effectively cope with harsh faults.
关键词:  Doubly-fed induction generator (DFIG), wind turbine (WT), feedforward-feedback control, mapping solution, low voltage ride through (LVRT)
DOI:https://doi.org/10.1007/s11768-020-8038-4
基金项目:
A novel control solution for improved trajectory tracking and LVRT performance in DFIG-based wind turbines
Ahmad HASHEMI,Christian CONFICONI,Andrea TILLI
(The Center of Complex Automated Systems (CASY) at the Department of Electrical, Electronic and Information Engineering (DEI), \\University of Bologna, Risorgimento, 2, 40136 Bologna, Italy; Sama Technical and Vocational training College, Islamic Azad University, Kermanshah Branch, Kermanshah, Iran)
Abstract:
This paper presents a new control strategy for the rotor side converter of Doubly-Fed Induction Generator based Wind Turbine systems, under severe voltage dips. The main goal is to fulfill the Low Voltage Ride Through performance, required by modern grid codes. In this respect, the key point is to limit oscillations (particularly on rotor currents) triggered by line faults, so that the system keeps operating with graceful behavior. To this aim, a suitable feedforward-feedback control solution is proposed for the DFIG rotor side. The feedforward part exploits oscillation-free reference trajectories, analytically derived for the system internal dynamics. State feedback, designed accounting for control voltage limits, endows the system with robustness and further tame oscillations during faults. Moreover, improved torque and stator reactive power tracking during faults is achieved, proposing an exact mapping between such quantities and rotor-side currents, which are conventionally used as controlled outputs. Numerical simulations are provided to validate the capability of the proposed approach to effectively cope with harsh faults.
Key words:  Doubly-fed induction generator (DFIG), wind turbine (WT), feedforward-feedback control, mapping solution, low voltage ride through (LVRT)