非对称电网故障下的双馈风电机组低电压穿越暂态控制策略

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非对称电网故障下的双馈风电机组低电压穿越暂态控制策略

更新时间：2025-08-13

- 非对称电网故障下的双馈风电机组低电压穿越暂态控制策略
- Automation of Electric Power Systems Vol. 38, Issue 18, Pages: 13-19(2014)
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- Published：2014
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[J]. Automation of electric power systems, 2014, 38(18): 13-19.
DOI：

[J]. Automation of electric power systems, 2014, 38(18): 13-19. DOI：

摘要

传统基于Crowbar的低电压穿越(LVRT)解决方案不仅没有充分利用变流器对双馈感应发电机(DFIG)的控制灵活性

而且也难以较好地适应当今不断提升的并网要求。而当前非对称电网故障下的暂态补偿控制策略也缺乏相应的实验验证。鉴于此

文中对电网电压发生跌落故障时定、转子电磁暂态过程进行了深入分析和讨论

并针对非对称故障时转子端过电压主要由定子磁链直流分量和负序分量引起这一现象

研究了一种有效的LVRT控制策略。该策略通过在DFIG转子侧适时准确地分别注入与磁链直流分量和负序分量相对应的暂态补偿量

最大限度地减小暂态转子电压冲击

提高DFIG的暂态可控性

拓展可穿越的电压故障范围

进而改善双馈风电机组的LVRT性能。11 kW模拟机组的实验验证了所述分析和设计。

Abstract

For the conventional crowbar-based low-voltage ride-through (LVRT) strategies for doubly-fed induction generator (DFIG)

not only is the flexibility of the driving converter not made full use of

but also today’s stringent grid-connection codes can hardly be well satisfied. Besides

some transient compensation based control strategies for asymmetrical grid fault are short of experimental verifications. Therefore

the electromagnetic transients of DFIG during grid faults are analyzed and discussed at length

based on which it is found that the high rotor terminal voltage during the process is mainly caused by the direct current (DC) and negative-sequence components included in the stator fluxes. To overcome the impact

an effective LVRT strategy is studied

in which some transient compensations based on the DC and negative-sequence components are provided to the rotor circuit timely and exactly. With the compensations

the magnitude of the transient rotor voltage is reduced to the lowest level for allowable rotor currents. As a result

the transient controllability of DFIG is strengthened

and the controllable range of voltage dip is expanded. Therefore

the performance of LVRT for DFIG is improved. The proposed analysis and design is validated by experiment on an 11 kW test-rig for wind turbines.

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Related Institution

College of New Energy, China University of Petroleum (East China)

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Key Laboratory of Guangxi Electric Power System Optimization and Energy-saving Technologys (Guangxi University)

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