N+M redundant UPS system composed of centralized monitoring multiple subsystems

Abstract

The invention belongs to the technical field of emergency power supplies, and particularly relates to an N+M redundant UPS system composed of centralized monitoring multiple subsystems. For a multi-unit module UPS system composed of at least two groups of UPS subsystems or N+N or N+B (B is an integer from 1 to N) redundant emergency power supply system, maintenance charging and discharging are carried out on the battery string of the unit subsystems in turn, at the same time the status information of each battery in the battery string is monitored by a battery monitor. Through parameters preset by a system controller according to a program or parameters and policies set by a display and control panel and a system remote communication interface, a battery status signal collected by the battery monitor is monitored and analyzed, and a control instruction is judged and generated. Automatic monitoring and analysis, automatic maintaining, automatic charging and discharging power adjusting and automatic lagged battery location prompt are realized. Healthy running of the battery string is ensured. The availability and security of the battery string are greatly improved. The service lives of batteries are prolonged. The security, reliability and timeliness of the UPS system are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of emergency power supply, and in particular relates to an N+M redundant UPS system composed of multiple sub-systems with centralized monitoring. Background technique [0002] As we all know, UPS as an emergency power supply is widely used in various industries and departments, providing power guarantee for key loads, and its working stability and safety are extremely important. However, due to problems such as improper management of the UPS power supply system, insufficient maintenance, aging batteries, and inappropriate capacity configurations of the users during use, it is easy to cause faults such as short circuits in the UPS power supply system, battery breakdown, and even fires. cause safety accidents and heavy losses. [0003] The State Patent Office has published the application number 201510149311.9 "Remote Maintenance Device for Uninterruptible Power Supply", which records in the background techno...

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Problems solved by technology

[0007] 1) Most of the batteries used in UPS are energy storage batteries, and their charging and discharging power is limited by product design, materials and processes. The product performance and the recommended use when leaving the factory are both charging and discharging current at 25°C; It is recommended to work continuously for less than 5 minutes at 0.3C; at present, the batteries configured in most user UPS systems are ≤2 hours, and reach 0.5C when running at full load, and ≥0.25C when running at 50% load; this seriously affects the health and safety of the battery Hidden dangers; especially when the internal resistance of the battery is inconsistent or partially aging, it is very easy to cause an accident and a fire will occur when it is serious;

[0008] 2) Usually, the UPS battery is in a floating charge standby state for a long time, and the capacity drops due to the crystallization of the plates. It is necessary to charge and discharge the battery with a large current within a certain period of time to melt the crystals and activate the chemical substances in it.

[0009] 3) Among many batteries, there are certain differences when they leave the factory, and the differences gradually increase during the gradual aging process. The current UPS system monitors the batteries mainly based on the terminal voltage. The terminal voltage of the battery string Under normal conditions, individual batteries may have been overcharged or undercharged, which can easily cause premature failure of individual batteries and cause accidents.

[0010] 4) Batteries need periodic maintenance. At least one or two maintenance charges and discharges and battery inspections are carried out each year. At present, it is basically done manually, which is time-consuming, laborious, easy to omit, and this process takes a certain amount of time to affect the design and operation of the UPS system.

[0011] 5) In order to improve the reliability of the UPS of the uninterruptible power supply system, the existing technology usually adopts the N+M redundant UPS system, that is, adding more than one redundant UPS unit to make them each other's backup backup unit system, and another UPS In the event of failure, the backup UPS unit is replaced; however, there is a lack of online maintenance of the battery, which cannot overcome the above-mentioned related problems in the use of the battery

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