该文研究了面向节点，随运行工况变动跟踪估计电网等值参数的方法。
A tracking estimation method of network equivalent parameters of facing nodes is researched with the variation of operation point.
潮流跟踪法应用于输电网的有功潮流分析和无功潮流分析。
The tracing method in meshed transmission networks is applied to both active and reactive power flows.
基于正交变换，提出了一种新的电网频率跟踪方法。
Based on orthogonal transform, a new method of tracking power grids frequency has been provided.
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