电网戴维南等值参数的短周期跟踪估计法

Short-cycle tracing-estimation method of Thevenin's equivalence parameter for power grid

分析了利用两点相量分析类方法进行戴维南等值参数估计时保证结果准确的理论前提,指出了实际应用过程中存在各种前提之间相互抵触或难以保证的问题。提出了一种基于短周期采样值跟踪估计戴维南等值参数的方法及装置实现的原理方案。该方法只需要一个工频周期的采样值即可满足数据处理的需要,可极大地缩短测量和计算周期的长度、提高计算结果关于某一运行状态的准确性,为降低测量装置的复杂性提供了技术支持。数值算例表明,该方法是对两点相量分析类方法的有效改进,具有明显的性能优势。

The paper analyzed the theoretic precondition the accuracy of results is assured when Thevenin＇s equivalence parameter was estimated with two-state phasor analysis method, pointed out that there were contra- dictions among all kinds of preconditions in actual situation and proposed a method of tracing-estimating Thevenin＇s equivalence parameter and its device based on short-cycle sampling value, which just needs sampling values within one power-frequency-period to meet the requirement of data processing and greatly decreases the length of measure and calculation periods; and improves the accuracy of calculating results in some operation condition, provides technical supports for simplifying its device. The circulating results showed that it is a method improved to two-point-phasor analysis method, which has a significant advantages in performance.