Online monitoring system for running state of transformer substation DC system

Abstract

The invention discloses an online monitoring system for the running state of a transformer substation DC system, and relates to the technical field of substations. The system comprises a transformer substation, a switch, an SDM ring network, a server and a monitoring control unit. The transformer substation is electrically connected with the bidirectional input end of the switch through a local area network. The bidirectional output end of the switch is electrically connected with the bidirectional input end of the server through the SDM ring network. The voltage, the current and the environment temperature of a storage battery pack are monitored in real time according to the state of the storage battery pack; the voltage and the internal resistance of each single storage battery are monitored; cross comprehensive analysis is carried out on the voltage, internal resistance data and variation trend of a single storage battery in combination with a charge-discharge curve; health hidden troubles of the storage battery pack can be timely discovered and alarm prompt information can be given so that timely maintenance is facilitated, remote realization and real-time control can be realized, equipment of the transformer station DC system is enabled to be in a great working state, and objectives of safe production and working efficiency improvement can be achieved.

Description

technical field [0001] The invention relates to the technical field of substations, in particular to an online monitoring system for the operation status of a DC system of a substation. Background technique [0002] With the continuous development of the power system, there are more and more unattended substations. The operating status of the DC system is directly related to the safe operation of the entire power system. Reasonable on-line monitoring and scientific analysis of the operating status of the DC system, timely maintenance It is very important. The core of the DC system of the substation is the battery, and the difficulty of the operation and management of the DC system is also the battery. At present, although the battery inspection instrument has been installed in many places, the effect is often not very satisfactory. Therefore, the substation battery There are also the following problems in the use of groups: [0003] 1. In the existing technology, there is a...

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Problems solved by technology

[0003] 1. In the existing technology, there is a lack of internal resistance detection function or internal resistance detection means. The traditional means of judging the capacity and life of battery packs is regular check charging and discharging. Research shows that the change of internal resistance can be used as a basis for quickly judging the health status of the battery. The previous internal resistance detection methods generally include high-current instantaneous discharge method, low-current discharge method, AC injection method, etc., all of which have certain deficiencies, which restrict the application effect of battery internal resistance detection as a means of judging the capacity and life of battery packs;

[0004] 2. In the existing technology, the analysis of the data collected by the battery pack often stays in a relatively simple processing method, which cannot achieve comprehensive and scientific comprehensive analysis and trend judgment;

[0005] 3. In the existing technology, the inherent manufacturing discreteness of the battery pack, unreasonable DC power supply parameters or poor quality make the battery pack in an unsatisfactory working state for a long time, which also causes accelerated aging of the battery pack and cannot reach the expected service life. important reason, so the real-time monitoring of DC power parameters cannot be ignored

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