Characteristics of Short-Circuit Current in Distribution Network with Doubly-Fed Wind Power System

doi:10.16183/j.cnki.jsjtu.2022.011

Abstract

Abstract:

The doubly-fed induction generator (DFIG) is connected to the distribution network as a distributed power source, which turns a radial single power supply system into a dual power supply system and changes the topology of the distribution network. When a short-circuit fault occurs in the distribution network, the short-circuit current of the distribution network will be affected by the access to wind power. Aimed at the problem that the short-circuit current is affected by the access capacity of the wind turbine and the location of the access point when DFIG is connected to the distribution network by distributed power sources and a three-phase short-circuit fault occurs at different points in the distribution network, a theoretical derivation and a simulation analysis are conducted by combining the control strategy of DFIG. First, relational expression of short-circuit fault current of the distribution network including wind power is theoretically derived, and the short-circuit current provided by the wind turbine is analyzed. Then, model predictive control is introduced to be compared with classical vector control to analyze the impact of different control strategies on the short-circuit current. The changes in access capacity and location are analyzed when a three-phase short-circuit fault occurs at different points in the distribution network, and the impact of DFIG on the short-circuit current of the distribution network is summarized.

Key words: doubly-fed wind power system, model predictive control, distribution network, short-circuit current

CLC Number:

TK89

XI Xinze, XING Chao, QIN Risheng, HE Tingyi, HE Peng, MENG Xian, CHENG Chunhui. Characteristics of Short-Circuit Current in Distribution Network with Doubly-Fed Wind Power System[J]. Journal of Shanghai Jiao Tong University, 2023, 57(7): 921-927.

Figures/Tables 11

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References 13

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风力机位置	I₁/kA	I₂/kA	I₃/kA	I_DG/kA
母线A	3.09	0	0	0.54
AB段50%处	2.13	0	0	1.10
母线B	2.24	0.001	0.001	1.19
BC段50%处	2.24	1.17	0.013	1.16
母线C	2.23	1.17	0.037	1.14
CD段50%处	2.23	1.15	1.15	1.13

风力机位置	I₁/kA	I₂/kA	I₃/kA	I_DG/kA
母线A	0.78	0.78	0.78	0.31
AB段50%处	0.72	0.78	0.78	0.33
母线B	0.64	0.81	0.81	0.36
BC段50%处	0.61	0.61	0.85	0.42
母线C	0.61	0.61	0.87	0.46
CD段50%处	0.60	0.60	0.60	0.50

容量/MW	电流/kA
容量/MW	2	4	6	8
I₁	2.24	2.24	2.24	2.24
I₂	1.17	1.36	1.62	1.84
I₃	0.037	0.039	0.042	0.046

容量/MW	电流/kA
容量/MW	2	4	6	8
I₁	0.61	0.60	0.58	0.56
I₂	0.61	0.60	0.58	0.56
I₃	0.82	0.86	0.91	0.96

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