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For IT data center and high voltage UPS applications, selecting a lithium-ion (Li-ion) backup solution for a critical standby power source can help users to benefit from a reduced installed footprint, optimized total facility energy and a reduced environmental footprint when compared to conventional battery solutions. Backup systems utilizing high power Li-ion cells offer the ability to significantly...
A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm...
Based on a modular design concept, 100 kVA uninterruptible power system using double-sided air-cooled power module has been developed. An efficient air-cooling system suitable for the double-sided cooled power module is developed, and the volume of the converter adopted developed double-sided air-cooling system becomes less than half compared to the conventional converter based on single-sided cooling...
With the continuous increase of corporate and personal needs of the Internet, the data center industry has entered a stage of large-scale planning and construction. It is expected that in 2015 the national market benefit of data centers will be more than 50 billion. As the business development, the power consumption of data center also increased year by year. But traditional technique and rough construction...
In recent years, in overseas, particularly Asian countries, demand of UPS is growing up, the expansion of three-phase four-wire type UPS of the line-up for the Asian countries has come to be expected in our company. In this paper, based on the new way of thinking, we report that we have developed a three-phase four-wire type UPS in a short development period by applying the single-phase UPS that we...
In this work the deployment of the Redflow Zinc Bromine Module (ZBM) in telecommunication applications under different scenarios is proposed. With a specific focus on remote area applications and long backup time, the ZBM can be used to outperform existing technologies. In fact, not only does the battery have superior performance compared to existing solutions, but the product proved to be very versatile...
In this paper, serial multi-module UPS system control considering battery module balancing is proposed. Because of the organization, the UPS system has some properties. One of them is output voltage is sum of each UPS module output voltage. Thus, each UPS module output voltage respective control can accomplish each battery module balancing according to SOCs of each battery module. As SOC is high or...
This paper proposes a bypass transfer method without parallel feeding between utility power line and uninterruptible power supply (UPS). This system has ACSWs consists of a bi-directional thyristor and a magnetic contactor both utility power line and UPS line. The control board observes the condition of utility power and UPS to operate ACSWs. A proposed method has instantaneous interruptible period...
A small modular unit for a power converter system with long lifetime DC-link capacitors is proposed. To reduce the ripple current stress of DC-link capacitors and to improve their lifetime by limiting temperature rises, low phase-to-phase-impedance busbars are selected. Consequently, in a power converter system whose size is 101 L, operating at a rated power of 100 kVA, DC-link capacitors achieve...
This paper presents the predictive control of single-phase UPS system for fast dynamic characteristic. When occurring grid fault, UPS system has to transfer UPS mode and supply power to the load. In PI controller, it has a disadvantage rather low dynamic characteristic, which is caused increasing transient time. To solve this problem, the predictive control is proposed. By adopting predictive control...
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