基于dfig的风电转换系统故障穿越行为研究

P. Tourou, C. Sourkounis
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引用次数: 10

摘要

电网中的不对称电压条件会对配备双馈感应发电机(DFIG)的风能转换系统(WECS)的性能产生显著的负面影响。在有功输出功率和无功输出功率、直流电压和无功转矩中引入了暂态峰值、稳态二阶谐波和高频谐波。这些影响会缩短系统的寿命,在极端情况下,由于系统将无法通过故障,它们可能导致违反网格代码要求。必须采取保护措施,使WECS保持与电网的连接,满足低压穿越要求,同时不危及系统的可靠性。本文分析了电压不对称下降情况下基于dfig的WECS的动态特性。提出了一种控制策略,使电压降对WECS的负面影响最小化,并使其能够安全地“穿越”故障。采用该策略,风电转换系统能够支持故障时和故障后的电压恢复,满足电网规范的要求。
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Investigation of fault ride-through behavior of DFIG-based wind energy conversion systems
Asymmetrical voltage conditions in the grid can have significant negative effects on the performance of wind energy conversion systems (WECS) equipped with doubly-fed induction generators (DFIG). Transient peaks as well as steady-state second-order and higher frequency harmonics are introduced in the active and reactive output powers, in the DC-link voltage and in the toque produced by the WECS. These effects can decrease the lifetime of the system and in extreme cases they can lead to violation of the grid code requirements as the system will not be able to ride-through the fault. Protective measures must be taken so that the WECS remains connected to the grid and fulfills the low voltage ride-through requirements, without putting the reliability of the system at risk. In this paper the dynamic behavior of the DFIG-based WECS in the case asymmetrical voltage dips is analyzed. A control strategy is presented, which minimizes the negative effects of voltage dips on the WECS and enables it to `ride-through' the fault safely. With this strategy the wind energy conversion system can support the voltage recovery during and after the fault and it can fulfill the demanding grid code requirements.
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