Abstract: The common types of UPS currently available on the market include backup UPS, online interactive UPS and online UPS. Many brands and manufacturers tout the selling points of their products, which makes users lose their direction in UPS product selection. Summarize the quality and selection of UPS for your reference.
In important data gathering places such as data centers and enterprise information centers, UPS is not a simple power source. It not only can change the voltage and frequency, but also provides backup time after power failure. It can also realize the isolation between the power grid and the electrical appliance, and provide high quality clean power for the electrical appliance.
Nowadays, the common types of UPS on the market include backup UPS, online interactive UPS and online UPS. Many brands and manufacturers tout the selling points of their products, which makes users lose their direction in UPS product selection. This article is about UPS. The quality and selection issues are summarized for your reference.
UPS technology has developed over the past four generations. The combination of IGBT rectification and IGBT inverter is the mainstream technology of today's UPS products. It adopts high-frequency pulse width modulation IGBT rectifier technology and has strong adaptability to the power grid. The input power factor can be as high as 0.99 without a filter. The advantages are as follows:
1, using the input voltage range: "±25%
2. Input power factor: 0.99
3, harmonic component "3% green power supply
4, will not cause energy loss due to the installation of filters
5, the machine is light weight - easy to install and transport
Disadvantages:
1. The rectifier capacity is limited by the existing technical conditions ("200KVA")
2, the stability is not as good as the thyristor rectifier
The purpose of using IGBT rectification is mainly to improve the power factor of the input terminal ≈1--to make the input current as close as possible to the sine wave while reducing DC ripple and harmonic interference to expand the UPS input voltage range.
First, diesel engine / UPS capacity matching
Note: The front-end generator capacity of the UPS parallel system is 1.8 times that of a single unit. The user investment conditions allow the generator set to have a margin of 1.25 times.
Second, UPS capacity and model selection
1, user load; UPS output redundancy (70 ~ 80%)
2. The load peak factor (3:1) cannot exceed the inverter overload capability.
3. Load apparent power (KVA) cannot exceed UPS rated power * Power factor conversion factor
4, three-phase load imbalance "30%
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