Optimal Voltage Support Strategy for Permanent Magnet Direct Drive Fan Under Asymmetric Fault

doi:10.16628/j.cnki.2095-8188.2022.12.011

Abstract

Abstract:

In order to optimize the point of common coupling(PCC)voltage support strategy of permanent magnet direct drive fan under asymmetric faults,the instantaneous power during asymmetrical faults of the power grid is firstly analyzed,and the expressions of each sequence component of the grid-side converter(GSC) incoming current are obtained to eliminate the double frequency fluctuation of active power.Then,the support principle of GSC power injection to PCC voltage is analyzed.At same time,a positive and negative sequence active and reactive current distribution strategy based on the grid impedance ratio is proposed to eliminate the active power double frequency fluctuation,effectively support PCC positive sequence voltage and effectively suppress negative sequence voltage.Simulation results verify the effectiveness of the proposed strategy.

Key words: permanent magnet direct drive wind turbine, voltage support, asymmetric fault, grid impedance ratio

CLC Number:

TM614

GU Chunsong, CHEN Zhong, XIE Hui. Optimal Voltage Support Strategy for Permanent Magnet Direct Drive Fan Under Asymmetric Fault[J]. LOW VOLTAGE APPARATUS, 2022, 0(12): 70-77.

Figures/Tables 10

控制策略	$I d r e f +$ /p.u.	$I d r e f -$ /p.u.	$I q r e f +$ /p.u.	$I q r e f -$ /p.u.
1	0	-0.05	0.94	0.03
2	0.63	0	0.40	0.39
3	0.64	-0.22	0.39	0.14

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参数	数值	参数	数值
额定容量S_B/MVA	1	低压侧电压U_s/V	380
直流电压U_dc/kV	1.2	高压侧电压U_g/kV	35
滤波电感L_f/μH	20	线路电感L_g/mH	3
滤波电容C_f/μF	20	线路电阻R_g/Ω	1.5