基于撬棍电路与自适应控制策略的DFIG低压穿越系统研究
Study on the DFIG Low Voltage Traversal System based on Crowbar Circuit and Adaptive Control Strategy
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摘要: 针对异步双馈风力发电机(DFIG)因出现故障而导致并网系统产生安全问题,该文从实际需求出发,提出了基于撬棍电路与自适应控制策略的DFIG低压穿越系统设计方案,重点采用电子机械技术、控制策略技术对DFIG系统进行了数学模型建立,并对基本的异步双馈风力发电机的数学模型进行了改造,加入了撬棍电路与自适应控制策略,然后通过实验验证了系统的完整性和准确性,从而解决了模型的组合问题。同时,在后续实验时发现了低压穿越问题,而加入撬棍电路可以实现电路保护与自适应控制策略的预测,从而达到解决低压穿越问题的目的。此双策略系统为并网系统安全性的提升贡献了力量。Abstract: In response to safety issues and practical requirements arising from faults in the doubly-fed induction generator (DFIG) of a wind power generation system, a DFIG low voltage ride-through system based on crowbar circuit and adaptive control strategy is proposed in this article. The study focuses on the application of electromechanical and control strategy technologies after on-site investigation of DFIG, leading to the establishment of a mathematical model for the system. The basic mathematical model of the asynchronous doubly-fed induction generator is modified by incorporating the crowbar circuit and adaptive control strategy. The integrity and accuracy of the system are experimentally validated, addressing issues related to model composition. Subsequently, low voltage ride-through issues are discovered in the later experiments, and excellent results are achieved through the combined effect of the two strategies. This paper addresses the low voltage ride-through problem by incorporating the crowbar circuit for circuit protection and utilizing adaptive control strategy for prediction. The inclusion of the crowbar circuit and adaptive control strategy proves effective in resolving low voltage ride-through issues, holding significant value and meaning in the fields of smart power equipment and intelligent grid integration.