A high-reliability DC power supply for a substation and its inspection method

Abstract

The invention discloses a high-reliability DC power supply for a substation and a testing method. In order to overcome the problem that the battery packs of the prior art DC power supply system are connected in series and have poor reliability; the charging and discharging experiments cannot fully discover the hidden dangers of battery failure; the present invention adopts a busbar, AC / DC module, circuit breaker and DC load; The battery pack; the bidirectional DC / DC module is set between the DC bus and the battery module to indirectly control the charging and discharging of the battery module; the monitoring unit monitors the data of the battery module, judges the state of the battery module according to the data, and controls the bidirectional DC / DC The output voltage of the module; the host computer is connected with the monitoring unit through a communication protocol, receives and stores monitoring data, and sends control commands remotely. Guarantee the power supply of the DC system, avoid the lagging effect of a single battery pack, and improve reliability; the smoother process of the battery pack is simple; it can realize the checking discharge of 100% of the rated capacity of the DC power supply, and completely find out the hidden dangers of failure.

Description

technical field [0001] The invention relates to the field of a substation DC power supply system, in particular to a high-reliability DC power supply for a substation and a charging and discharging experiment method thereof. Background technique [0002] The DC system power supply is the power supply for the relay protection and automatic control devices in the substation. The battery pack, as the only backup power supply for the normal operation of the DC system, is the core component of the DC system. The reliability of its power supply plays an important role in the safe operation of the power system. role. [0003] At present, the power supply scheme of the DC system is as follows: 380V AC is converted into 110V or 220V DC to supply power to the system, and a set of batteries are used for backup. When the AC is abnormal, the battery pack supplies power. There is only one battery pack for the backup power supply. When the AC is abnormal, if the battery pack also fails, t...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that battery packs in the prior art DC power supply system are connected in series, and the reliability is poor; the hidden danger of battery failure cannot be fully found in the charging and discharging experiments; it provides a high-reliability DC power supply for substations, improves the reliability of the DC system, and weakens the DC power supply The problem of the single lagging effect of the system, the delay in switching between the backup power supply and the main power supply is low, and a DC power supply inspection method is provided, which can realize the checking discharge of 100% of the rated capacity of the DC power supply, and completely discover hidden troubles

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