Power monitoring system

Abstract

The invention provides a power monitoring system. The power monitoring system comprises a power device; the power device is connected with a reactive power compensation device and a power distribution protection device; the reactive power compensation device and the power distribution protection device are connected with a central controller; the power distribution protection device determines an expected short-circuit current of a power supply device based on parameters of the power device; a short-circuit protector monitors running short-circuit current of the power device in real time; when the monitored running short-circuit current reaches to the expected short-circuit current and the short-circuit time is beyond a first preset threshold, the short-circuit protector cuts off the power supply source of the power device; and a compensation controller calculates out reactive power based on the real-time voltage and the real-time current, determines reactive power which requires compensation and accordingly controls partial switching capacitors in a switching capacitor group to perform reactive power compensation based on a preset switching strategy. The power monitoring system can realize reactive power compensation of a power grid, can perform power distribution protection, and can guarantee balanced operation of equipment while a power factor is ensured and electric energy loss is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power, in particular to an electric power monitoring system. Background technique [0002] At present, with the rapid development of the economy, the low-voltage (AC not exceeding 1000V or DC not exceeding 1500V) power distribution system occupies a dominant position. The link with the most equipment, the longest line, and the largest power consumption is inseparable from the low-voltage power distribution system in factories, mines, cities, and rural areas. Therefore, the reasonable, safe, efficient and stable operation of the low-voltage power distribution system, It is directly related to the reliability and quality of electricity consumption of the majority of users, so it is of great significance to protect the distribution lines and control equipment of the low-voltage distribution system. At present, molded case circuit breakers, fuses or leakage circuit breakers are mostly used for low-v...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a power monitoring system, which solves the problems in the prior art that the power factor of the power grid is reduced due to reactive power and the power equipment is damaged due to short-circuit current.

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