基于超导磁储能系统的双馈风机协同故障穿越策略

doi:10.19799/j.cnki.2095-4239.2021.0261

摘要/Abstract

摘要：

在大规模风电基地通过高压直流输电远距离送出背景下，闭锁、换相失败等直流故障会在送端产生暂态电压扰动导致风机连锁脱网，严重威胁系统的安全稳定。建立风电外送系统模型，结合过电压下双馈风机的暂态响应分析，揭示了直流闭锁导致双馈风机连锁脱网这一过程的内在机理；进一步地，提出一种基于超导磁储能系统和改进风机控制协同的故障穿越策略：在双馈风机本身产生去磁电流和无功电流的同时，储能系统协同向双馈风机转子侧快速注入两种电流。最后，在MATLAB/Simulink中搭建仿真模型。通过与去磁控制和传统矢量控制进行对比，仿真案例和实际案例均证明所提策略在各种故障下都能够更有效地将风机各项关键参数限制在安全范围内，同时更有利于抑制直流故障后暂态过电压的幅值，从而降低连锁脱网的风险。

关键词: 高压直流输电, 直流闭锁, 暂态过电压, 双馈风机, 超导磁储能系统, 去磁控制, 协同控制, 故障穿越

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

中图分类号:

TM 614

沈渭程, 甄文喜, 邵冲, 谢琦. 基于超导磁储能系统的双馈风机协同故障穿越策略[J]. 储能科学与技术, 2022, 11(1): 136-146.

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.

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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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