Active Disturbance Rejection Control of Current of Direct Drive Wind Turbine in Power Grid Fault

doi:10.16183/j.cnki.jsjtu.2023.159

Abstract

Abstract:

The grid connection guidelines require wind turbines to have capability to quickly support reactive power in the events of grid faults. However, traditional proportional-integral controllers have the problems of slow transient response and poor adaptability dealing with changes in grid impedance and serious model disturbances. In order to solve this problem, this paper proposes an improved reactive power support control strategy which combines linear active disturbance rejection control(ADRC) with least error squares(LES) filters. The LES filter is used to quickly and accurately detect the amplitude of the fault grid voltage with background harmonics, which can effectively reduce the fault detection delay. The ADRC controller is used to effectively improve the transient reactive power response speed and the control adaptability and robustness of the wind turbines under grid impedance disturbance. The simulation model of direct drive wind turbine based on PSCAD/EMTDC is built considering two scenarios, weak power grid and power grid with background harmonics. The effectiveness of the proposed control strategy is verified by simulation.

Key words: direct drive wind turbine, grid faults, active disturbance rejection control (ADRC), least error squares (LES) filter

CLC Number:

TM461.5

WANG Han, WANG Fuwen, ZHOU Dangsheng, SHI Gang, ZHANG Jianwen, CAI Xu. Active Disturbance Rejection Control of Current of Direct Drive Wind Turbine in Power Grid Fault[J]. Journal of Shanghai Jiao Tong University, 2024, 58(12): 1968-1976.

Figures/Tables 10

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参数名称	数值
额定容量,P/MW	3
额定电压,V/V	690
极对数,p	44
定子电阻,R_s/Ω	0.017
定子漏感,X_s/Ω	0.064
直轴电感,L_d/mH	0.5
交轴电感,L_q/mH	0.5
风速,v/(m/s)	9
直流母线电压额定值,V_dc/kV	1.2
C_dc/mF	10
L_f/mH	1
电网电感,L_g/ mH	0.2
线路阻抗,Z₁/Ω	0.625+j1.256
线路阻抗,Z₂/Ω	10.5+j28.3
短路电阻,R_c/Ω	16
电压外环比例系数,K_pu	0.2
电压外环积分系数,K_iu	0.1
电流内环比例系数,K_pi	0.6
电流内环积分系数,K_ii	0.1
k_p	300
ω_oz	2000