831 / 2019-04-29 21:10:04

A Synchronized Measurement Method with Wide Frequency Bandwidth

ESPRIT,harmonic,inter-harmonic,synchronized measurement

Large-scale operation of renewable power stations and high ratio penetration of power electronic devices have added many inter-harmonics to the power system in addition to the serious problems of harmonic pollution. These dynamically changing inter-harmonics raise new security issues, such as sub-synchronous oscillations (SSO) and frequency stability control. The frequency separation between these harmonics and inter-harmonics may be small, and their amplitudes and frequencies may change rapidly. In this paper, a synchronized measurement method with wide frequency bandwidth is proposed. This method can estimate the parameters of harmonics and inter-harmonics with high frequency resolution and short time window. Then a wide-frequency synchronized measurement device is developed.