Control Strategies for Suppressing Frequency Oscillation of Doubly-Fed Wind Farms Connected to Grid

doi:10.16183/j.cnki.jsjtu.2021.437

Abstract

Abstract:

Aimed at the problem of low-frequency oscillations caused by cross-region power transmissioin of large-scale wind farms, a single neuron adaptive proportion integration differentiation (PID) additional damping control strategy for low-frequency oscillations of the damping system is proposed in this paper. By analyzing the dynamic frequency response characteristics of doubly-fed wind turbines, a wind farm damping system oscillation controller is constructed by introducing quadratic performance indicators into the single neuron adaptive PID control algorithm. By adaptively adjusting the excitation frequency converter, the wind farm can quickly generate active power and the maximum positive damping, and suppress the low-frequency oscillation of the damping system. MATLAB is used to build a four-machine two-region power system simulation model with a wind farm. The comparison verifies that the method proposed in this paper can effectively suppress the swing of the power angle of the synchronous generator when low-frequency oscillation occurs in the system, improve the inertial response of the system, and reduce the risk of low-frequency oscillation in the power grid.

Key words: doubly-fed induction generator, low-frequency oscillations, single neural proportion integration differentiation (PID) algorithm, additional damping control

CLC Number:

TM614
TM712

LIU Xinyu, LU Xinyan, ZENG Long, HAO Zhenghang, ZHAO Qifang, LI Xianwei, HAO Tongmeng. Control Strategies for Suppressing Frequency Oscillation of Doubly-Fed Wind Farms Connected to Grid[J]. Journal of Shanghai Jiao Tong University, 2022, 56(3): 303-311.

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参数	取值	参数	取值
X_d(p.u.)	1.80	X″_d(p.u.)	0.25
X_q(p.u.)	1.70	X″_q(p.u.)	0.25
X_L(p.u.)	0.20	R_a(p.u.)	0.0025
X'_d(p.u.)	0.30	T'_d₀/s	8.0
X'_q(p.u.)	0.55	T'_q₀/s	0.4
T″_d₀/s	0.03	T₁/s	6.5
T″_q₀/s	0.05	T₂/s	6.175
S_b/(MV·A)	900	U_b/kV	20

同步机	电压(p.u.)	有功功率/MW	无功功率/MVar
H₁	1.03∠20.0°	700	185
H₂	1.01∠10.5°	700	235
H₃	1.03∠-6.8°	719	176
H₄	1.01∠-17.0°	700	202