Bus-controlled parallel uninterrupted power source (UPS) system

Abstract

Parallel UPS system controlled by bus relates to power source equipment technology with the following scheme: UPS parallel control system is put in and connected with UPS, realizing N+1 redundant parallel operation and every UPS will supply electricity to load and shares the load to meet the requirement of parallel operation having very high real time data process capability to ensure the real time control and reliability of UPS parallel control system increased greatly.

Description

Technical field: [0001] The invention relates to the technical field of power supply equipment, in particular to a bus-controlled parallel uninterruptible power supply (UPS) system. Background technique: [0002] Due to various harmonic interferences, flashes, surges, etc. in the actual power supply network, the power supply quality is poor and unstable; in addition, due to factors such as lightning strikes, power supply line failures, accidents, etc. Cause the interruption of power supply; for ordinary households, these effects will not cause serious consequences, but for some special industries and departments, such as banking systems, securities companies, telecommunications departments, railway and civil aviation signaling systems, computer Network systems, large-scale data processing and switching centers, national defense and other industries and departments, it is difficult to imagine what kind of consequences will occur once the power supply system is interrupted or ...

AI Technical Summary

Problems solved by technology

[0002] Due to various harmonic interferences, flashes, surges, etc. in the actual power supply network, the power supply quality is poor and unstable; in addition, due to factors such as lightning strikes, power supply line failures, accidents, etc. Cause the interruption of power supply; for ordinary households, these effects will not cause serious consequences, but for some special industries and departments, such as banking systems, securities companies, telecommunications departments, railway and civil aviation signaling systems, computer Network systems, large-scale data processing and switching centers, national defense and other industries and departments, it is difficult to imagine what kind of consequences will occur once the power supply system is interrupted or the power supply system is disturbed by poor power supply quality, causing most losses; with the progress of the times With the development of society and society, the power users in various departments and fields of the national economy have higher and higher requirements for the power supply quality of the power supply system. However, most of the requirements are difficult to meet by the mains power grid power supply system. -Uninterruptible Power Supply) follows the needs of the society; however, as a single power electronic device, the reliability of its work cannot be absolute. When there is always a failure, the failure rate during its working life It is impossible to reach zero; once the UPS is damaged, the load power supply will still be interrupted; in order to further improve the reliability of the load power supply, and at the same time expand the power supply capacity, efforts are being made to study the parallel operation control technology of UPS at home and abroad. , the parallel control technology has experienced the development from centralized control, master-slave control and other stages to the advanced stage of decentralized logic and no interconnection control. The early centralized control method used centralized parallel cabinets. This method has strong adaptability to instantaneous overload. And it can be expanded in stages; however, its control technology is relatively complicated. Once the centralized control system circuit fails, the power supply of the entire UPS power supply system will be interrupted. The MTBF of the entire UPS power supply parallel control system is the same as that of parallel UPS power supplies. Improve the working reliability of the UPS power supply system; the master-slave control method adopts a certain parallel UPS power supply as the master, and the rest are slaves to perform parallel control work, which avoids the failure of the entire system after the centralized controller fails. Crash, the working reliability of the system is improved compared with the centralized control mode, the control and connection of this control mode are simple; the slave machine runs under no load, saving power; however, there is a switching time from the slave machine to the master machine, and its The load of the slave machine changes to 100%, so that the slave machine will be impacted by a large current and is easily damaged. There are also problems of long-term work and idleness between the master machine and the slave machine, resulting in different aging degrees of the two devices; in addition, there is a parallel machine In addition to the advantages of centralized control mode, the module parallel connection method has no independent components, simple debugging and high reliability. However, with the increase of the number of parallel machines, the control technology is complicated and the investment in equipment is large.

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