What is an uninterruptible power supply (UPS)?
Uninterruptible power supplies (UPSs) deliver clean, conditioned, and reliable power to critical loads such as communication systems, network servers, medical equipment, etc. . Typically, the UPS provides unity power factor, high efficiency, high reliability, low cost, and continuous power supply, irrespective of the grid conditions [2, 3, 4].
What is a high-frequency isolated online UPS system for low power applications?
This paper proposes a high-frequency isolated online UPS system for low power applications. The proposed UPS consists of a single-stage AC-DC converter, boost DC-DC converter, and an inverter. The single-stage AC-DC converter provides galvanic isolation, input power factor correction, and continuous conduction of both input and output current.
How is active and reactive load distribution between N paralleled single-phase uninterruptible power supply (UPS) inverters?
Abstract: The active and reactive load distribution between n paralleled single-phase uninterruptible power supply (UPS) inverters is equalized by virtue of n-1 load-sharing control loops. The approach permits the construction of UPS systems of any desired power rating at maximum utilization of the power components.
What is a single phase high-frequency transformer isolated online UPS?
Conclusions A single phase high-frequency transformer isolated online UPS has been proposed in this paper. A single-stage AC-DC converter provides galvanic isolation, efficient power conversion, and excellent power factor correction. Besides, the AC-DC converter also charges the battery bank of the UPS system during grid mode of operation.
What is a high-frequency transformer based UPS?
High-frequency transformer-based UPSs offer an effective solution to the problems mentioned above by reducing the size of the system as well as providing suitable galvanic isolation between the load and grid.
What is a transient effect in a UPS system?
The transient effect in the output voltage is very small and the UPS system provides uninterruptible power to the load as shown in Figure 10 a. Similarly, the transition from battery mode back to grid mode upon the restoration of the grid power is shown in Figure 10 b. There is a small transient at the turning ON point of the AC-DC converter.
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