Multimachine parallel connection method and scheme of modular UPS (uninterrupted power supply) system

Abstract

The invention discloses a multimachine parallel connection method and scheme of a modular UPS (uninterrupted power supply) system, and belongs to the technical field of power supply equipment. In the multimachine parallel connection method provided by the invention, more than one modular UPS system is utilized, wherein the modular UPS systems are mutually connected through a parallel communication bus and a static switch bus; output reference control modules which can generate reference signals capable of enabling the output signal states of each modular UPS system to maintain the same frequency and the same phase are arranged between each modular UPS system and the parallel communication bus; and switch control modules which can generate static switch control signals capable of controlling the states of output switches of each module UPS system are arranged between each modular UPS system and the static switch bus. According to the invention, the mutual redundancy backup between the parallel redundancy modes and the systems of the modular UPS systems is realized, the normal operation of the whole large system is ensured when certain individual modular UPS system malfunctions; and the capacity increasing and expanding operation of the system is simplified, the maintenance is convenient, and the operation cost of users is lowered.

Description

technical field [0001] The invention relates to the technical field of power supply equipment, in particular to a multi-machine parallel connection method and a connection scheme of a modularized UPS system. Background technique [0002] In recent years, with the rapid growth of my country's industrial level, users have put forward higher requirements for the reliability of Uninterruptible Power Supply (UPS) systems. Stand-alone UPS systems can no longer meet the needs of users. In order to increase For the reliability of single UPS system operation, users often choose the following three methods to improve the fault tolerance of the system during operation: [0003] 1. Master-slave series hot backup: This method adopts the working method that the slave is connected to the bypass output port of the master. When the master fails to switch to bypass, the slave will automatically supply power to the load. This method is simple and convenient to connect. Its disadvantages are: t...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the main machine works with load during normal operation, and the slave machine is no-load operation; when the back-end load is large, the aging rate of the main machine and the slave machine is different, and it is often necessary to manually cut off the power to adjust the position of the main machine and the slave machine, and the system maintenance inconvenient

Its disadvantages are: the user needs to purchase two UPSs of the same capacity to realize 1+1 direct parallel redundant backup at the initial stage of purchase, and the two UPSs of the same capacity are in the light-loaded state for a long time during use, which not only increases the Increased the purchase cost of the user, and wasted resources

Although this method realizes parallel redundancy of power modules, other components in the system cannot achieve redundancy. When other components in the system fail, the entire system may go down, interrupting the power supply of user loads and making it impossible to monitor the entire system. Comprehensive outage maintenance operations

[0006] In addition, the modular UPS system itself is an independent system, and its output power is limited. When the power of the system itself reaches the maximum output power, the system cannot be expanded. The user can only adopt the method of partition power supply. Multiple sets of modular UPS systems operate independently, which increases the difficulty of troubleshooting electrical circuit loops for the entire power supply environment, and will increase some unpredictable potential hidden dangers. Users are often unwilling to use such power supply methods

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