发电机励磁整流装置动态均流技术及其应用

Dynamic current sharing technology of generator excitation rectifier and its application

励磁整流装置直接影响发电机及其励磁系统的可靠运行,整流装置各分支的输出电流均衡性是励磁整流装置的重要运行指标,关系到励磁整流装置的运行效率和安全裕度。大型发电机整流装置分支众多,影响均流系数的因素更为复杂,本文从均流系数物理意义入手,介绍几种常用的传统均流技术及其不足,提出一种应用于大型发电机励磁系统的动态均流技术,能够在发电机运行状态下实时监控各整流分支的输出电流,并能够自动进行相应调整,在发电机长期稳定运行过程中保证均流系数满足励磁标准要求,提高整流系统的电流冗余度和安全稳定裕度,最后给出工程应用实例和结论。

The excitation rectification device directly affects the reliable operation of the generator and its excitation system.The output current balance of the branches of the rectification device is an important operation index of the excitation rectification device,which is related to its operational efficiency and safety margin.Large generator rectification device has many branches,and the factors affecting the current sharing coefficient are more complicated.This article starts from the physical meaning of the current sharing coefficient,then introduces several traditional current sharing technologies commonly used and their shortcomings,and next proposes a dynamic current sharing technology applied for large generator excitation systems,which can monitor the output current of each rectifier branch in real time when the generator is running,and can automatically adjust accordingly to ensure that the current sharing coefficient meets the excitation standard requirements during the long-term stable operation of the generator,and improve the current redundancy performance of the rectifier system as well as the safety and stability margins.Finally,engineering application examples are given before summarizing the conclusions.