Suppression Strategy of Sub/Super-synchronous Oscillations in Doubly-Fed Wind Farm Based on SVG Additional Current Feedback Impedance Reshaping

doi:10.11930/j.issn.1004-9649.202308003

Abstract

Abstract:

Doubly-fed wind farm often interacts with the power grid, leading to sub/super-synchronous oscillations. To address the issue of limited adaptability in suppressing these oscillations using impedance reshaping methods, this paper proposes an impedance reshaping method based on a static var generator (SVG)-additional current feedback control. The virtual impedance established by this method is correlated with the impedance characteristics of the wind farm, providing greater flexibility compared with fixed virtual impedance obtained through modeling and analytical design. Initially, the virtual impedance formulation, incorporating the SVG and wind farm grid-connected impedance models, is derived. Subsequently, the effectiveness of the proposed method and the impact of impedance reshaping control parameters on the suppression performance are analyzed based on impedance frequency characteristics. Finally, based on the grid-connected model of a doubly-fed wind farm in Qinghai Province, an electromagnetic transient simulation model is developed in PSCAD/EMTDC. The simulation results demonstrate that the proposed method achieves impedance reshaping for the wind farm under different oscillation conditions, effectively suppressing sub/super-synchronous oscillations in the wind farm.

Key words: wind farm, sub/super-synchronous oscillations, SVG, oscillation suppression, impedance reshaping

Zejia WANG, Minxiao HAN, Yiwen FAN. Suppression Strategy of Sub/Super-synchronous Oscillations in Doubly-Fed Wind Farm Based on SVG Additional Current Feedback Impedance Reshaping[J]. Electric Power, 2024, 57(8): 55-66.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202308003

https://www.electricpower.com.cn/EN/Y2024/V57/I8/55

Figures/Tables 25

Fig.1 Equivalent circuit of grid-connected system of doubly-fed wind farm

Fig.2 Structure of SVG with additional current feedback impedance reshaping control

Fig.3 SVG dual closed-loop system with additional current feedback control

Fig.4 Circuit of SVG

Table 1 Main parameters of DFIG

参数	数值	参数	数值
直流电压 U_wdc/kV	1.45	变压器电压/kV	35/0.69/0.69
交流电压 U_wM/kV	0.69	RSC内环PI	1.2+0.025/s
额定容量 S_w/MW	2	RSC外环PI	2+0.02/s2+0.05/s
直流电容 C_wdc/μF	500	RSC锁相环PI	2.2+0.238/s
滤波电容 C_wf/ μF	700	GSC内环PI	1+0.01/s
滤波电感 L_wf/H	0.00134	GSC外环PI	0.4+0.01/s
额定频率 f₁/Hz	50	GSC锁相环PI	1.2+0.05/s

Table 2 Main parameters of SVG

参数	数值	参数	数值
直流电压 U_dc/kV	21	增益系数 k_s	13
直流电容 C_dc/mF	15	Hbutt1阶数 n₁	4
交流电压 U/kV	10	Hbutt1截止频率f_c1/Hz	1
交流滤波电感 L/H	0.002	Hbutt2阶数 n₂	2
额定频率 f₁/Hz	50	Hbutt2截止频率 f_c2/Hz	100
内环控制PI	20+ 0.0007326/s	外环控制PI	1.0+170/s
变压器电压/kV	35/10

Fig.5 Nyquist curves comparison of Gsy

Fig.6 Frequency characteristic curve of KDtS

Fig.7 Frequency characteristic curve of KDtS with changing ks

Fig.8 Frequency characteristic curve of KDtS with changing fc1

Fig.9 Frequency characteristic curve of KDtS with changing fc2

Fig.10 Proportional parameter changing of outer-loop PI controller of SVG

Fig.11 Integral parameter changing of outer-loop PI controller of SVG

Fig.12 Inner-loop parameter changing of SVG

Fig.13 Frequency characteristic curve of KDtS before and after parameter adjustment

Fig.14 Simulation model for grid-connected output of doubly-fed wind farm

Fig.15 Positive sequence impedance of wind farm

Fig.16 Impedance frequency characteristic curves of wind farms under different conditions

Fig.17 Comparison of simulation results with and without suppression

Fig.18 Harmonic components of output current of wind farm with and without suppression

Fig.19 SVG output current with and without suppression

Table 3 Change of SVG parameters

状态	增益系数K_s	Hbutt2截止频率f_c2/Hz
调整前	13	100
调整后	16	123

Fig.20 Comparison before and after parameter adjustment

Fig.21 Comparison of simulation results with and without suppression during parallel compensation oscillation

Fig.22 Harmonic components of output current of wind farm with and without suppression

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