Power distribution network fault monitoring device installation position determination method and system

Abstract

The invention discloses a power distribution network fault monitoring device installation position determination method and system. The method comprises the following steps: carrying out matrix standardization processing on an SCADA data set of the fault monitoring device; performing singular value decomposition processing on the standardized data matrix; calculating a covariance matrix of the data set; calculating a composite index and a composite index threshold; determining the installation position of the fault monitoring device according to whether the composite index is within the composite index threshold range. The method achieves the recognition of the sensitive position of the power distribution network to the state change, and achieves the optimal determination and effective recognition of the installation position of the fault monitoring device of the power distribution network.

Description

technical field [0001] The invention relates to a method and system for determining the installation position of a distribution network fault monitoring device, belonging to the technical field of distribution network fault monitoring. Background technique [0002] There are many branch lines in my country's distribution network, the length of the section line is inconsistent, and there are many types of loads at the end of the line. In order to monitor the fault of the distribution network, it is necessary to install a fault monitoring device in the network. Due to factors such as maintenance, cost, and monitoring efficiency It is impossible to install monitoring devices at every branch node and load access point of the whole network. In order to realize the observability of faults in the whole network, fault monitoring devices are generally installed at the end of the line and each branch line at present. The main problem of this installation is: due to the complex structur...

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Problems solved by technology

[0002] There are many branch lines in my country's distribution network, the length of the section line is inconsistent, and there are many types of loads at the end of the line. In order to monitor the distribution network fault, it is necessary to install a fault monitoring device in the network, and due to factors such as maintenance, cost, and monitoring efficiency It is impossible to install monitoring devices at every branch node and load access point of the whole network. In order to realize the observable faults of the whole network, the current fault monitoring devices are generally installed at the end of the line and each branch line.

The main problem of this installation is: due to the complex structure of the distribution network, when the transient high-frequency signal generated by the fault has undergone multiple refraction and reflection at the branch nodes of the line and the energy on the line has attenuated, the intensity of the fault signal when it reaches the substation end The starting condition of the fault location device cannot be met, so that the line protection device operates and the fault location device does not start; or the monitoring device at the end of the line receives interference from a large number of harmonics at the end, resulting in frequent malfunctions, etc.

Therefore, according to this characteristic, Shandong University of Technology proposed a configuration method based on the pivot space in 2017. Since the fault information is mainly contained in the data residual space, this method ignores the impact of the fault amount in the residual space on the installation location. The effect of identification, so that the determined position is not unique and has a lot of redundancy

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