ABSTRACT:
During
the power transmission of doubly-fed induction generator (DFIG), due to the influence
of series compensating capacitance and long-distance transmission, DFIG is
prone to sub-synchronous oscillation, which damages the stability of the
system. By establishing the mathematical model of DFIG system, the cause of
sub-synchronous oscillation and its influence on the control strategy of DFIG
system are discussed. In order to solve the problem of performance degradation
of traditional phase-locked loop (PLL) under sub-synchronous oscillation, an
improved PLL is proposed to replace the traditional PLL. Aiming at the problem
that the control of rotor side converter(RSC) and grid side converter(GSC) in
doubly-fed wind power generation system under sub-synchronous oscillation is
disturbed by harmonic signals, a control method of adding a quasi resonant
controller in the control link of RSC and GSC to suppress sub-synchronous oscillation
is proposed, and the feasibility of the method is verified by simulation and
experiment. Finally, based on the research process of RSC direct resonance
control, the sub-synchronous oscillation suppression strategy based on harmonic
current extraction is proposed for the frequency adaptability of the quasi resonant
controller. The actual performance of the sub-synchronous oscillation
suppression strategy is verified through simulation and experiment. The
experimental results show that the strategy is effective.
KEYWORDS:
1. Doubly
fed induction generator
2. Sub-synchronous
oscillation
3. Rotor
side converter
4. Stator
side converter
5. Phase-locked
loop
6. Quasi
resonance controller
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure 1. Structure Diagram Of Dfig Wind Power System Experimental Prototype.
EXPECTED SIMULATION RESULTS:
Figure 2. Frequency Response Of F3(S).
Figure 3. Simulation Waveform
Under Sub-Synchronous Oscillation.
Figure 4. Rsc Direct Resonance Control Simulation Waveform.
Figure 5. Gsc Direct Resonance Control Simulation Waveform.
Figure 6. Simulation Diagram Of Sub-Synchronous Oscillation Suppression Strategy Based On Harmonic Current Extraction.
Figure 7. The Resonant Controller Suppresses The Experimental Waveform Of The Ssci.
Figure 8. Waveforms Were Compared Before And After 10hz Synchronous Oscillation Suppression.
REFERENCES:
[1]
C. Guoping, L. Mingjie, X. Tao, and L. Mingsong, ``Study on technical bottleneck
of new energy development,'' Proc. CSEE, vol. 37, no. 1, pp. 20_26,
2017.
[2]
C. Guoping, L. Mingjie, X. Tao, Z. Jianyun, and W. Chao, ``Practice and
challenge of renewable energy development based on interconnected power
grids,'' Power Syst. Technol., vol. 41, no. 10, pp. 3095_3103, 2017.
[3]
O. P. Mahela, N. Gupta, M. Khosravy, and N. Patel, ``Comprehensive overview of
low voltage ride through methods of grid integrated wind generator,'' IEEE
Access, vol. 7, pp. 99299_99326, 2019.
[4]
X. Xiaorong, H. Jingbo, M. Hangyin, and L. Haozhi, ``New issues and classi_cation
of power system stability with high shares of renewables and power
electronics,'' Proc. CSEE, vol. 41, no. 2, pp. 461_474.
[5]
G. F. Gontijo, T. C. Tricarico, L. F. da Silva, D. Krejci, B. W. França, M.
Aredes, and J. M. Guerrero, ``Modeling, control, and experimental verification
of a DFIG with a series-grid-side converter with voltage sag, unbalance, and
distortion compensation capabilities,'' IEEE Trans. Ind. Appl., vol. 56,
no. 1, pp. 584_600, Jan. 2020.
