Analysis and Suppression Strategy of High Frequency Oscillation in PMSG Based Wind Farm with SVG

doi:10.12204/j.issn.1000-7229.2023.12.010

Abstract

Abstract:

High-frequency oscillations caused by the interaction between an SVG and direct-drive permanent magnet synchronous generator (PMSG) threaten the safe and stable operation of PMSG-based wind farms. To resolve this problem, a high-frequency impedance model of a PMSG-based wind farm with SVG is first established in this paper, and the formation mechanism of high frequency oscillation is analyzed. The frequency distribution of the negative damping interval of the SVG is derived, and the oscillation stability of the system is analyzed, based on which the stable value range of the system control parameters is obtained. Based on the oscillation mechanism, an additional damping control method based on current feedback is proposed in this study. The high-frequency oscillation of the wind farm is effectively suppressed by SVG high-frequency phase compensation, and the parameters are adjusted. Finally, an electromagnetic transient simulation model of a PMSG-based wind farm is developed in MATLAB/Simulink to verify the effectiveness of the oscillation analysis method and additional damping control strategy.

Key words: static var generator (SVG), PMSG-based wind farm, high frequency oscillation, additional damping control

CLC Number:

TM712

CHENG Dong, XIA Shiwei, LI Gengyin, SUN Guanqun, CHEN Rusi, WANG Erxi. Analysis and Suppression Strategy of High Frequency Oscillation in PMSG Based Wind Farm with SVG[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(12): 115-124.

Figures/Tables 16

Fig.1 Topology ofPMSG-based wind farm

Fig.2 GSC topology and control diagram

Fig.3 GSC simplified small signal control block diagram

Fig.4 Equivalent circuit of PMSG and cable line

Fig.5 Equivalent system structure of wind farm grid connection

Fig.6 Bode diagram of wind farm parts and power grid

Fig.7 Schematic diagram of SVG impedance phasor decomposition

Fig.8 Diagram of SVG negatively damped region affecting oscillation stability of the system

Fig.9 Value range of Kps under different Tsd to ensure system stability

Fig.10 SVG small signal control block diagram after adding additional controls

Fig.11 SVG impedance phasor diagram with additional controls

Fig.12 Bode diagram of system impedance and grid interaction before and after adding control

Fig.13 PCC point current waveform and FFT results after SVG input

Fig.14 PCC point current waveform and FFT results before and after parameter adjustment

Fig.15 Current waveform at PCC before and after additional control

Table A1 Main parameters of the system

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