4. Dual inverter voltage compensation online
This type of UPS consists of a battery, an AC/DCIAC inverter, and a DCIAC inverter. It adopts the voltage compensation principle (Delte conversion) in AC voltage regulation technology in the main circuit, belongs to the series parallel power transmission mode, has a large output power, and can overcome the shortcomings of dual conversion online UPS. The dual inverter voltage compensation technology, also known as Delta technology, is currently the most advanced technology internationally. It successfully applies the voltage compensation principle in AC voltage regulation technology to the main circuit of UPS. When the mains power is normal, the two sets of inverters only adjust and compensate for the difference between the input voltage and the output voltage. The maximum power borne by the inverters is only 20% of the output power, so the power intensity is small and the power margin is large, which enhances the output and overload capacity of UPS. There is no need to limit the peak coefficient of load current, and it can easily deal with impact loads. There is also no need to limit the load power factor again. The output active power can be equal to the calibrated KVA value. This type of UPS is used for load equipment with high requirements for different powers (mainly high power). In summary, the application of Delta technology not only compensates for the shortcomings of the original online approach, but also leads to new breakthroughs in many key indicators.
Matching UPS with generator
In high-power UPS systems, if customers require a long backup time, they often need to configure a large number of backup battery packs. However, this configuration scheme has certain limitations because a large number of backup battery packs require a large storage space, while also considering the load-bearing capacity of the floor. In addition, backup battery packs have a certain replacement cycle and require significant later capital investment. To solve these problems, for UPS power supply with longer delays, it is often considered to use a configuration scheme that matches the generator with the UPS, using the generator as the ultimate backup means.
When the UPS is paired with a generator, only a small amount of backup batteries need to be configured for the UPS to be used during switching. The conversion between the generator and the mains power can be done manually or with automatic switching equipment (ATS). When the mains power fails, the automatic switching equipment (ATS) will automatically switch to the generator end, and the generator will automatically start after a certain time delay (which can be set according to customer needs) to provide power guarantee.
In practical applications, different customers have different requirements for the reliability of the power supply system, and the configuration methods of UPS and generator are also different. Generally speaking, the common methods are single machine mode, parallel machine mode, etc. Single machine mode has high cost-effectiveness. Although the reliability of the power supply system is average, the system architecture is simple and economical, and the disadvantage is that there is a single point of failure hazard in the system. The parallel system adopts two or more UPS redundant backups, which can effectively improve the reliability of the parallel system, and of course, the engineering cost of the equipment will also increase accordingly.