| With the development of smart grid,electronic transformer has been widely used in the power system because of its distinct and significant performance advantage. However, the digital output way of electronic transformer determine some problems to be solved in the application, the solution to these problems will be critical to its development in the future.In this paper,according to the introduction of measurement principle of electronic transformer, the integral part, which impact the accuracy of output data of Rogowski hollow coil current transformer,has been analysed. Several integration algorithm has been simulated by the MATLAB,and the integration algorithm for the protection has been selected.This paper also studied the synchronization problems of electronic transformer’output data.According to the analysis of requirements for clock synchronization in the intelligent substation,a high-precision clock synchronization program is proposed,which combines Compass/GPS dual timing system clock source with the IEEE1588protocol packets.The new synchronization scheme is suited for high-digital,networked,intelligent substation in the future.Meanwhile, Lagrange interpolation algorithm,which is used to calculate the output data of electronic transformer from the devices to protection relaying,is analyzed by MATLAB simulation.The impact of interpolation algorithm on full-wave Fourier algorithm is also analysed when data is lossed and marked time is wrong,a new messure is proposed to identify and process abnormal interpolation data. |
