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The data center redundant parallel ups power solution mainly includes low frequency double conversion online UPS power supply solution, high frequency UPS power supply solution, and modular UPS power supply solution. Each solution has its own advantages and disadvantages, and the users need to make the targeted selection plan according to their actual conditions. The situation is targeted. This article will discuss these several options, and provide a reference for users to make appropriate choices.
Low frequency double conversion online UPS power supply solution
The traditional phase-controlled rectifier UPS is used to form a "1+1" dual-bus power supply solution to solve the single-point fault bottleneck, which has good fault tolerance to improve the reliability of the power supply system. Generally, the single machine power capacity of the 3 phase UPS is 200~400kVA.
Advantages of the low frequency double conversion online UPS power supply solution: Due to the voltage stress of the low frequency power device is small, the reliability of the device is high, and its control is relatively simple, therefore, the reliability of the system is relatively high.
The shortcomings of the low frequency backup power UPS supply solution: the large size, heavy weight, large power consumption, low efficiency and low input power factor of the whole machine greatly affect the reliability and economic indicators of the data center power supply. Under normal circumstances, the efficiency of the low frequency UPS is about 92%; and the input power factor of the 12-pulse model is 0.8, and its current harmonic is 10%; To meet the high requirements of the power supply, need to add the corresponding filters, which will increase the cost, volume and weight.
The IGBT rectifier no break UPS is used to form a "1+1" dual bus power supply solution to solve the single point fault bottleneck, which has good fault tolerance and improves the reliability of the power supply system.
The advantages of high-frequency double conversion online UPS power supply solution: Input power factor is high, can reach 0.99; current harmonic is small, less than 5%; system efficiency is high, can reach 94% to 95%; the whole machine is small in size, light in weight, effectively reduced the construction difficulty and cost of on-site construction; compared with low frequency online UPS, the whole machine volume can be reduced by 20% to 30%.
The disadvantages of high-frequency double conversion online UPS power supply solution: Ground-line coupling generates more high-frequency harmonics, resulting the zero-ground voltage at the load end is higher, which is difficult to meet the needs of server manufacturers such as IBM and HP for sites with zero ground voltage less than 1V. The high-power UPS power device has the higher operating voltage, which makes the device withstands large voltage stress, and the device reliability is lower than that of the low frequency UPS.
The scheme adopts modular UPS to form a "1+1" dual-bus power supply system to solve the single-point fault bottleneck. Generally, the single unit capacity is suitable at 200~480kVA.
Advantages of the modular UPS power system solution:
1, Scalability: Modular UPS has N+X architecture features, which can be expanded on demand according to load increase or cost budget, provided that the total system capacity needs to be defined in advance.
2, Operation and maintenance is simple and efficient: No need to stop WHEN repair when replace or repair, no professional technicians are present, the user can replace the faulty module in the online state.
3, Physical space investment: The redundant parallel modular UPS has an absolute advantage over the traditional UPS in the physical size and weight, can help the users saving a lot of room investment and load-bearing reinforcement investment.
4, High efficiency and energy saving: It has good input indicators, high efficiency, reducing the user's operating costs. The input power factor is up to 0.99; the input current harmonic is less than 5%, and the system efficiency is 94% to 95%.