High-reliability direct-current power supply for transformer substation and inspection method

Abstract

The invention discloses a high-reliability direct-current power supply for a transformer substation and an inspection method. In the prior art, direct-current power supply system battery packs are connected in series and have poor reliability; and battery fault hidden troubles cannot be completely found in a charging and discharging experiment. In order to overcome the above problems, the power supply and the method are provided in the invention. The power supply comprises a bus, an AC/DC module, a circuit breaker, a DC load, a battery module, a bidirectional DC/DC module, a monitoring unit and an upper computer, wherein the battery module includes a plurality of battery packs connected in parallel; the bidirectional DC/DC module is arranged between the direct-current bus and the battery module and indirectly controls charging and discharging of the battery module; the monitoring unit is used for monitoring data of the battery module, judging a state of the battery module according tothe data and controlling an output voltage of the bidirectional DC/DC module; and the upper computer is connected with the monitoring unit through a communication protocol, receives and stores the monitoring data, and remotely issues a control command. Power supply of a direct-current system is guaranteed, a single battery pack lag effect is avoided, and reliability is improved; the battery pack is smoother and simple in process; and 100% rated capacity check discharge of the direct-current power supply can be realized, and fault hidden dangers can be completely found.

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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