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Power supply and distribution system as an important part of the information system, the basic requirement is that the system must be able to work continuously. In order to achieve the purpose of continuous work, the first is that the system should have high reliability, and secondly the system must be able to quickly repair. If it can not be repaired quickly , you may face second failures leading to the risk of paralysis of the entire system, can not guarantee the load continuous work.

In terms of rapid repair, modular UPS has a natural advantage. First of all, in the repair time, due to the characteristics of quick plug, modular UPS can complete the replacement at the scene, the average repair time in half an hour, compared to the traditional tower UPS for repair time of 24 hours, the repair speed improved significantly. Secondly, in the repair quality, repair the modular uninterruptible power supply through the fault module replacement, while the traditional tower UPS need factory to send professional engineers to the locale to locate the fault and repair the fault circuit board and disassemble, the repair cycle is long, and exist the process of communication and positioning, easily lead to repetitive work, affecting the efficiency of fault handling.

Some users may doubt that the N+1 structure of modular UPS is not as stable as the 1+1 system. Indeed, theoretically, the reliability of the 1+1 system must be the highest in the N+1 systems. But factly it is often not so simple:

First of all, this conclusion ignores the load rate, as 1+1 system, only allows one UPS down; while for the modular UPS system, taking 4+1 as example, the reliability is lower than that of 1+1 system when 100% load, but when 75% load rate, modular system becomes a 3+2, then a 2+3 when 50%, the reliability is much larger than the 1+1 system. In the common application situation, the UPS load rate is about 20~40%, in this case the modular has a very obvious advantage.

Secondly, different from the traditional single UPS, modular UPS can easily achieve the redundancy mode such as N+2, N+3, which only need to add 1-2 modules. But if tower type UPS need to achieve this mode, should not only increase 1 hosts, but also transportation, site installation, machine alignment design and the corresponding distribution, the battery needs to change, resulting in a substantial increase in investment.

In summary, the reliability of UPS modulares in the application is much higher than the traditional tower UPS; coupled with the characteristics of rapid maintenance and expansion of UPS, the availability of modular UPS is much higher than the traditional tower UPS.

SOROTEC exhibit at the Middle East Electricity2017(Solar Middle East). Looking forward to meeting you here. Booth: Z2 B30.

1.Solar power inverter requires high efficiency. Due to the high price of solar cells, in order to maximize the use of solar cells, improve system efficiency, we must try to improve the efficiency of the solar inverter.

2.Solar inverter requires high reliability. Solar power generation system is mainly used in remote areas, many power station unattended and no maintenance, which requires the inverter with a reasonable circuit structure, strict screening of components, and requires the solar system inverter with various protection functions, such as input DC reverse polarity protection, output short circuit protection, overheating protection, overload protection etc..

3.Solar inverter requires a wide range of DC input voltage. The solar battery terminal voltage varies with load and sunshine intensity, although the voltage of solar cell battery plays an important role, but because of the battery voltage fluctuate varies with the change of residual capacity and internal resistance of battery, especially when the battery aging, the change range of terminal voltage is very wide, such as 12V battery, the voltage can be the change in 10V ~ 16V, which requires the inverter must ensure the normal operation in a wide range of DC input voltage, and ensure the stability of output voltage.

4.In the middle and large capacity solar power system, the output of the inverter should be a sine wave with small distortion. This is because in the middle and large capacity system, if use square wave power supply, the output will contain many harmonic parts, which will produce additional losses. Many loads of the solar power system is a communication or instrumentation equipment, these devices have higher requirements on the quality of the power grid. In order to avoid the pollution of the power grid, the inverter output sine wave current is needed.

Learn more about SOROTEC SSP3118C off grid solar inverter specifications

1.Whether online interactive UPS in the normal city power supply, or power supply interruption, both power supply from the battery to the inverter, in the meantime, the power supply to the load is provided by the inverter of the UPS. This basically eliminates the impact of any voltage fluctuations and interference from the city power grid on the load, the realization of the load without interference voltage regulator. At present, the online interactive UPS on the market can achieve regulated power supply to the load, when the voltage range of 180 ~ 250V, the general output voltage stability can reach 220±6.6 V.

2.Online interactive UPS sine wave output waveform distortion coefficient is relatively small. At present, the distortion coefficient of the products sold in the market is less than 3%.

3.When the power supply interruption, the line interactive UPS system can achieve the real uninterrupted power supply to the load. UPS manufacturer found that it is because as long as the internal battery can supply power to the inverter, when the city power is interrupted, online interactive UPS supply power to the load by the inverter as normal. Therefore, the interruption of power supply or not, the UPS does not have any internal conversion action. Therefore, in the process of city power supply switch to the interruption, conversion time of UPS power supply to the load is zero.

4.Compared with the off line UPS, the online interactive UPS has excellent characteristics of output voltage transient. Generally, when the full load to no-load transformation, the output voltage range of 4%.

5.Online interactive UPS generally uses PWM pulse width modulation technology, so the noise is relatively small.

The main difference between low frequency online UPS and high frequency UPS is reflected in rectifier and transformer. Low frequency UPS rectifier uses SCR, the voltage stress is small and the current stress is high, the high frequency UPS mainly uses the IGBT device, the current stress is small, the voltage stress is big. SCR and IGBT are mature devices, as long as the application is properly, there is no difference in reliability. In fact, the inverter part of low frequency UPS is also used of IGBT, and therefore does not reduce the reliability of low frequency UPS, there is no evidence that the inverter is the weak link in the low-frequency UPS. Topologically, low frequency UPS use phase controlled rectifier and full bridge inverter, while high-frequency UPS use high frequency rectifier and half bridge inverter. These topologies are very commonly used in power electronics technology, there is no problem about who is more reliable in principle, its reliability depends on the level of design.

Shenzhen SORO Electronics Co., Ltd is a professional UPS and INVERTER manufacturer in the field of UPS power for over 10 years. We have two large production sites in Zhejiang and Shenzhen. SORO has been a leading enterprise in the UPS industry in China.