PMU (Phasor Measurement Unit) data filtering method for generator synchronous reactance parameter identification

Abstract

The invention embodiment discloses a PMU (Phasor Measurement Unit) data filtering method for generator synchronous reactance parameter identification. The PMU data filtering method for the generator synchronous reactance parameter identification comprises building a mathematical model for identifying the generator synchronous reactance parameters according to the steady-state operation characteristic of a synchronous generator; determining the needed PMU measurement data and the needed electric parameters of the identification according to the mathematical model and converting each electric parameter to a per-unit value; calculating according to the sensitivity mechanism to obtain the sensitivity of the generator synchronous reactance to the each electric parameter, obtaining the influence of a PMU measurement error of each electric parameter on synchronous reactance identification precision and consequently judging whether the PMU measurement data can be used or not for the generator synchronous reactance parameter identification to achieve the PMU measurement data filter. The PMU data filtering method for the generator synchronous reactance parameter identification has the advantages of obtaining the conditions that the PMU data can be used for the generator synchronous reactance parameter identification, achieving the PMU data filter and consequently improving the identification precision of the generator synchronous reactance parameters.

Description

technical field [0001] The invention relates to the technical field of synchronous generators, in particular to a method for screening PMU data used for identification of generator synchronous reactance parameters. Background technique [0002] At present, the generator synchronous reactance parameter is one of the important factors that determine the operation and behavior of the generator, and its accuracy is related to the safe and stable operation of the power grid. The generator synchronous reactance parameters used in power system analysis and simulation are mostly theoretical values ​​or design values ​​provided by the manufacturer. Since the influence of actual operating conditions such as eddy current, hysteresis, and saturation cannot be involved, the obtained results often do not match the actual operating conditions. For example, the field test proves that for a hydro-generator, the saturated direct-axis synchronous reactance Xd of the generator and the quadratur...

AI Technical Summary

Problems solved by technology

[0004] However, since the PMU data in the prior art mostly comes from the calculation of the measurement data, and the current and voltage are all from the measurement, it contains errors caused by various links such as current transformers, voltage transformers, digital sampling, FFT, and filtering. , it will inevitably cause errors in the PMU data, which will definitely have a certain impact on the identification accuracy of the generator synchronous reactance parameters

Images