UPS power supply system plays an important role in power supply guarantee in data centers of various industries. To provide uninterrupted power supply for loads, it must have the function of electrical energy storage. As an important part of the power supply system, UPS power supply is also the load of the power grid. Therefore, like other loads, the power factor is also an important electrical performance index to measure whether it pollutes the power grid.
What is the UPS power supply system? What are the UPS power factors?
UPS power supply system is a kind of power protection equipment with energy storage device, inverter as the main component, stable voltage and frequency output. There are two main functions in the application of computer and network systems: one is emergency use to prevent the sudden power failure of the power grid from affecting normal operation and causing damage to the computer system; the other is to eliminate the surge, instantaneous high voltage and instantaneous low on the city grid. "Power pollution" such as voltage, transient overvoltage, wire noise, and frequency deviation can improve power quality and provide high-quality power for computer systems.
In principle, it is a kind of power electronic equipment that integrates digital and analog circuits, automatically controls inverters and maintenance-free energy storage devices; functionally, it can effectively purify the mains when the mains is abnormal; it can also Supply power to the computer and other equipment for a certain period of time when the mains power is suddenly interrupted, so that you can have plenty of time to deal with it;
In terms of usage, with the advent of the information society, UPS is widely used in all links from information collection, transmission, processing, storage to application, and its importance is increasing with the increasing importance of information applications.
What are the UPS power factors?
UPS power supply has two power factor values: one is the input power factor; the other is the output power factor. The input power factor refers to the ability of the UPS power supply to absorb active power from the power grid and the degree of influence on the power grid; the output power factor refers to the adaptability of the UPS power supply to non-linear loads. The requirement for the input power factor is of course the higher the better, but the output power factor of the UPS is not necessarily true.
The input power factor of UPS power supplies of various circuit structures are also different. The input power factor of backup and online interactive UPS power supplies is equal to the power factor of the UPS power supply output load. When the mains is normal, their voltage regulation links do not have power. Factor control function, but it does not add power factor distortion to the power grid.
Power factor formula: cosθ=P/S. P is the active power, the unit is watts (W); S is the apparent power, which is also the UPS rated output power, the unit is volt-amperes (VA); cosθ is the power factor; θ is when the voltage and current are in different phases under nonlinear load Phase difference.
UPS with low power factor has many problems, mainly:
1. Increase the power grid waveform path loss
2. Reduce the power factor of the power supply system and increase the power supply capacity of the system
3. Reduce the service life of electrical equipment
In short, both the input power factor and the output power factor of the UPS can be improved by certain means. The output power factor of the UPS is not as large as possible. A low power factor UPS has the characteristics of a high power factor, but a high power factor UPS cannot replace the function of a low power factor UPS.
The above is the UPS power supply system and UPS power factor. The output power factor of the UPS varies with the nature of the load. It is not the nature of the power that the UPS wants to output to the load, but the nature of the power that the load requires. The UPS should adapt to the load, not the load.
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