An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions
Abstract
:1. Introduction
2. Impedance-Based Model of a DFIG System
2.1. System Description
2.2. Double-Fed Wind Power System Impedance Mode
3. Harmonic Impact Factor Analysis under Different Control Strategy Conditions
3.1. Harmonic Impact Factor Analysis under Current Suppression Control Conditions
3.2. Harmonic Impact Factor Analysis under Harmonic Voltage Suppression Conditions
3.3. Harmonic Impact Factor Analysis under Coordinated Suppression Conditions
4. System Stability Analysis
5. Experimental Validation
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
Nomenclature
io, ig | total output current, grid-side converter output current |
is, ir | stator current, rotor current |
VPCC, Usabc | voltage at PCC, stator voltage |
Lg, Cf, L | grid line impedance, shunt capacitors, filter inductor of GSC |
Ih | harmonic current source |
Ts, KPWM | sampling period, modulation gain of pulse-width modulation |
Kr, ωc, ω0 | the gain of the resonance regulator, the width and the resonance frequency |
ZLg, ZCf | the impedance of the grid inductance, the impedance of the shunt capacitor |
ZDFIG, Zgrid | output impedance of DFIG, grid impedance |
λ | coordinated factor coefficient |
Pg, Qg, Te | total active power, total reactive power and torque |
d, q | subscript for component of d and q axis |
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Parameter | Value |
---|---|
Rated power | 11 kW |
Rated speed | 1475 r/min |
Stator and rotor rated voltage | 380 V, 858 V |
Stator and rotor rated current | 17.6 A, 8.1 A |
Stator and rotor resistance | 0.2858 Ω, 0.2983 Ω |
Stator and rotor inductance | 0.068923 H, 0.069381 H |
Mutual inductance | 0.0676 H |
Number of pole pairs | 2 |
Simulation grid impedance | 0.8 mH, 300 μF |
Filter inductor L | 4 mH |
Filter inductor Lr | 0.5 mH |
Harmonic Voltage at PCC | Component (%) | Harmonic Current at PCC | Component (%) |
---|---|---|---|
THD | 9.9 | THD | 4.3 |
5th harmonics | 9.5 | 5th harmonics | 1.8 |
7th harmonics | 2.3 | 7th harmonics | 0.4 |
Harmonic Voltage at PCC | Component (%) | Harmonic Current at PCC | Component (%) |
---|---|---|---|
THD | 3.3 | THD | 10.6 |
5th harmonics | 2.4 | 5th harmonics | 9.0 |
7th harmonics | 0.9 | 7th harmonics | 2.8 |
Harmonic Voltage at PCC | Component (%) | Harmonic Current at PCC | Component (%) |
---|---|---|---|
THD | 6.6 | THD | 7.0 |
5th harmonics | 6 | 5th harmonics | 5.6 |
7th harmonics | 1.7 | 7th harmonics | 1.0 |
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Xie, Z.; Niu, L.; Zhang, X. An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions. Energies 2018, 11, 2613. https://doi.org/10.3390/en11102613
Xie Z, Niu L, Zhang X. An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions. Energies. 2018; 11(10):2613. https://doi.org/10.3390/en11102613
Chicago/Turabian StyleXie, Zhen, Lifan Niu, and Xing Zhang. 2018. "An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions" Energies 11, no. 10: 2613. https://doi.org/10.3390/en11102613