Phasor measurement unit (PMU) measurement data-based power line parameter identification and estimation method

The invention discloses a phasor measurement unit (PMU) measurement data-based power line parameter identification and estimation method, and belongs to the technical field of power system line parameter identification and estimation. The method comprises the following steps of: inputting basic data of an identified and estimated line by using a computer through a program, identifying error parameters of the line according to the PMU measurement data of multiple time intervals at two ends of the line, and estimating accurate parameters of the line to acquire estimation values of the accurate parameters of the line. A mean value-based identification index and parameter estimation method is constructed by using the PMU measurement data of multiple time intervals at two ends of the line, and a variance coefficient is used as a convergence precision criterion; and the method is simple, has good identification effect, high estimation precision and high calculation speed, and is convenient for popularization and application. The method can be widely applied to identification and estimation of the centralized parameters of the power line, the two ends of which are provided with PMUs; and the method is particularly suitable for identification and estimation of the parameters of medium length high-voltage and ultrahigh-voltage power transmission lines.