Coordinated fault ride through strategy for doubly fed induction generator using a superconducting magnetic energy storage system

doi:10.19799/j.cnki.2095-4239.2021.0261

Abstract

Abstract:

Transmitting large-scale wind power through a line-commutated converter-based high-voltage direct current (LCC-HVDC) system has become a common trend in China. Under this condition, the transient overvoltage in the sending end caused by HVDC blocking faults or commutation failures will cause a cascaded trip-off of doubly fed induction generators (DFIG), which seriously threatens the safety and stability of power systems. The internal mechanism of the process of the DFIG cascaded trip-off caused by the HVDC blocking faults is revealed by establishing the equivalent model of the wind power integrated sending end system and by analyzing the transient response of the DFIG under the transient overvoltage. A coordinated fault ride through scheme based on the rotor side superconducting magnetic energy storage system (SMES) and modified DFIG control strategies is proposed herein. While the DFIG generates demagnetizing and reactive currents, the SMES cooperates to quickly inject demagnetizing and reactive currents into the DFIG rotor side. Simulation and real-world cases conducted in MATLAB/Simulink verified that compared with demagnetization and traditional vector control, the proposed scheme can always limit the key parameters of the DFIG in a safe range and suppress the transient overvoltage, consequently reducing the risk of cascaded tripping.

Key words: line commutated converter based high voltage direct current, DC blocking, transient overvoltage, doubly fed induction generator, superconducting magnetic energy storage system, demagnetization control, coordinated control, fault ride through

CLC Number:

TM 614

Weicheng SHEN, Wenxi ZHEN, Chong SHAO, Qi XIE. Coordinated fault ride through strategy for doubly fed induction generator using a superconducting magnetic energy storage system[J]. Energy Storage Science and Technology, 2022, 11(1): 136-146.

Figures/Tables 13

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运行状况	暂升幅度q/p.u.	转差率s		u_rmax
同步速运行	0.3	0		0.3
次同步运行	0.3	0.2	0.3	0.5	0.6
超同步运行	0.3	-0.2	-0.3	0.62	0.78

类型	参数	数值
DFIG	容量/MW	1.5
	定子/转子电压/V	690/1725
	频率/Hz	50
	直流母线电压/V	1200
	极对数	2
	定子/转子电阻/p.u.	0.007/0.005
	定子/转子电感/p.u.	3.071/3.056
SMES	电感/H	0.5
	额定电流/A	1760
	滤波器电阻/电感/p.u.	0.003/0.3

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