就地化分布式元件保护子机动作行为差异分析

Analysis on Difference in Action Behavior of Sub-unit for On-site Distributed Main Equipment Protection

分析了造成就地化分布式子机保护动作行为不一致的原因,以及子机中断机制对保护计算的影响。各子机间中断异步将导致保护离散采样、数据插值、积分计算的一系列差异,进而导致保护动作行为不一致。针对子机中断异步问题,着重介绍了就地化分布式保护子机中断同步方法,方法不依赖于外部对时源,能够在较短时间内完成各子机同步。分析计算结果表明,子机中断同步后各子机能够有效降低保护计算值差异,进而增强保护动作行为的一致性。文中同时介绍了子机中断同步在异常情形下的处理方法。

The reasons for the inconsistency of action behavior of on-site distributed sub-unit protection and the influence of subunit interrupt mechanism on protection calculation are analyzed. The interrupt asynchrony among sub-units will lead to a series of differences in discrete sampling, data interpolation and integral calculation of the protection, which will further lead to inconsistent protection action behavior. To solve the interrupt asynchronous problem of sub-units, this paper focuses on the interrupt synchronous method for the on-site distributed protection sub-units. This method does not depend on the external time source and can complete the synchronization of sub-units in relatively shorter time. The analysis and calculation results show that the difference in protection calculation values can be effectively reduced after the interrupt synchronization of sub-units, then the consistency of protection action behavior is enhanced. The processing method for the sub-unit interrupt synchronization is also introduced in abnormal circumstances.