Active isolation type single-phase high-quality power supply system

Abstract

The invention belongs to the technical field of power transmission and distribution of power systems, and provides an active isolation type single-phase high-quality power supply system which is usedfor providing high-quality power supply and guaranteed power supply for important users and realizing peak-load shifting through cooperation with a power grid. The system comprises an input switch, anoutput switch, a bypass switch, an isolation reactor, a filter, a single-phase inverter, an energy storage battery and the like. Through improvement of a topological structure, the isolation reactorin the power supply system can achieve a good isolation effect under power grid disturbance or faults during normal operation of the power grid, and meanwhile, a power grid side power factor can be basically a unit power factor in cooperation with single-phase inverter control; and the single-phase inverter does not need to transmit load active power when the power grid operates normally and a peak-load shifting instruction of the system is not received, so the operation loss of the system is greatly reduced, the energy transmission efficiency of the system is improved, and the above advantages are more prominent in the case of a high-capacity load.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution of power systems, and more specifically relates to an active isolated single-phase high-quality power supply system, which is used to provide high-quality power supply and guaranteed power supply for important users, and cooperate with power grids to cut peaks and fill valleys. Background technique [0002] Today, important users not only require production indicators such as high power supply quality, power supply reliability, and operating efficiency, but also with the increasing load capacity, while ensuring high-quality power supply, improving the transmission efficiency of the power supply system and the utilization efficiency of modules have a significant impact on production. It is of great significance to study the power supply system with stable control performance and high operating efficiency. As a high-quality power supply system, Uninterrupted Power Supply ...

AI Technical Summary

Problems solved by technology

The UPS can basically filter out all the interference and harmonics in the power grid, and there is no conversion time for switching. At present, the technology development is relatively mature, and it is applied to most users. However, the rectifier and inverter of the UPS not only need Transmission of all load power results in high operating loss and low transmission efficiency of the system, and the control strategies of both need to match the operating state of the energy storage battery, so the control is more complicated. low efficiency

[0006] In summary, the traditional single-phase power supply system has certain contradictions in system control performance, transmission efficiency or module utilization efficiency, and with the increasing load capacity of important users, especially the power consumption and production of double-conversion UPS The significant increase in cost, coupled with the increase in the capacity of energy storage batteries with a single function makes the utilization efficiency of energy storage batteries even lower, making this type of contradiction more prominent

Images