What is an uninterruptible power supply (UPS) system?
Power distortions such as power interruptions, voltage sags and swells, voltage spikes, and voltage harmonics can cause severe impacts on sensitive loads in the electric systems. Uninterruptible power supply (UPS) systems are used to provide uninterrupted, reliable, and high-quality power for these sensitive loads.
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.
Which UPS system has the poorest efficiency?
Among the static UPS systems, online UPS system has the poorest efficiency due to double conversion. Line-interactive and universal topologies provide higher efficiencies since most of the power directly flows from the input AC to the load during normal operation.
What is output phase regulation for paralleled uninterruptible power supply system?
Output phase regulation for paralleled uninterruptible power supply system. When the active circulating current and reactive circulating current in the parallel system are detected in the control system, the increase in the inverter output voltage phase angle is calculated according to Eq. (15.41).
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 unified control scheme for uninterruptible power supply system?
Conceptual diagram of unified control scheme for uninterruptible power supply system. Because of the three-phase four-wire configuration, the control for each phase in both the PWM rectifier and inverter can be decoupled. Therefore, a single-phase independent control approach can be adopted.
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The levels of Electromagnetic Interference (EMI) generated by two standard models of Uninterruptible Power Supplies (UPS) were examined. Conducted current measurements were made on all conductors ...
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Uninterruptible power supplies (UPSs) are widely used to deliver reliable and high quality power to critical loads under all grid conditions. This paper proposes a high-frequency isolated online …
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This paper presents a new UPS topology, the active UPS (AUPS). The AUPS uses two high frequency cycloconverter circuits connected by a high frequency AC link. A full bridge inverter maintains the high frequency AC link power. One cycloconverter is connected in series with the mains, acting as a high impedance sinusoidal current source, and the other is connected in …
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