High-speed protection method suitable for T-connection type sending-out line of new energy station and application of high-speed protection method

Abstract

The high-speed protection method suitable for the new energy station T-connection type sending-out line comprises the following steps: aiming at the new energy station T-connection type sending-out line, installing the same protection device on each section of line, measuring the three-phase current of the side, carrying out compressed sensing on the three-phase current of the side to obtain a compressed signal, and transmitting the compressed signal to the other two sides through an optical fiber channel, the compressed signal is decompressed to obtain a reconstructed current after being received; the protection device superposes the three-phase short-circuit current of the two new energy stations, Morl et complex wavelet transform is carried out on the superposed current of the new energy stations and the system side current to obtain a wavelet coefficient matrix, and dimensionality reduction is carried out on the wavelet coefficient matrix by using a principal component analysis method to obtain a feature matrix; and each set of protection device carries out a Kanbalah distance criterion operation on the new energy superimposed current characteristic matrix and the system side current characteristic matrix, identifies a fault type by comparing a magnitude relationship between a criterion actual operation value and a setting value, and then starts a corresponding protection measure according to the fault type.

Description

technical field [0001] The invention relates to a protection method, in particular to a high-speed protection suitable for a T-connected outgoing line of a new energy station and its application. Background technique [0002] With the intensification of energy shortage and environmental pollution, new energy power generation has become one of the main ways to solve this problem. In order to save investment in power equipment, new energy power sources are often connected to the grid through T-connection transmission lines. However, due to the limited amplitude, frequency offset, phase angle controlled distortion, and non-fundamental frequency and low-order harmonics of new energy power supplies, the traditional differential protection as one of the main protections faces great challenges. . Therefore, it is necessary to study a new protection principle suitable for the T-connected outgoing line of new energy stations. [0003] Aiming at the problem that the performance of ...

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Problems solved by technology

[0008] Based on the above defects, we propose this high-speed protection method suitable for T-connection transmission lines of new energy stations, which reduces the amount of data required for communication through compressed sensing and relieves communication pressure; measures the fault characteristics on both sides of the line through the Canberra distance, The high-speed protection principle applicable to the T-connection transmission line of the new energy station is proposed, which effectively solves the problem of the performance degradation of the differential protection operation of the new energy access grid. The technical scheme is as follows:

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