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This paper proposes a three-phase six-inductor double-switch PFC circuit which is suitable for high frequency UPS application. This PFC circuit not only achieves high power factor correction in grid-connected mode of UPS, but also improves bus voltage in battery mode of UPS. This new PFC removes the independent boost design in common UPS and the whole cost can be reduced. The topology structure and...
With growing demand for electric power with high power quality and high availability for sensitive loads, a kind of Uninterruptible Power Supplies (UPS) named series-parallel have been introduced. Based on its structure, this topology could show both good power-quality indices-like low input current THD-and high power availability to the load. In fact, this topology utilizes a direct path called Delta...
This paper proposes a three-phase line-interactive Uninterruptible Power Supply (UPS) scheme, which is applied to three-phase four-wire systems, allowing harmonic suppression and reactive power compensation of the load, resulting effective power factor correction. The proposed UPS system is composed of two PWM converters, where one of them is placed in parallel with the load and the other one is placed...
Mission Critical Applications for Data Centers, Financial Institutions, Telecommunication and Government typically have Generators and UPS (Uninterruptible Power Supplies) providing backup power to keep their Critical IT (Information Technology) loads online. Tier I and Tier II topologies according to ANSI/TIA-942 are very simple and straightforward with no redundancy or single distribution path with...
This paper presents a novel design for double conversion UPS systems that results in higher power density, higher efficiency and more flexible parallelism for higher reliability. This design comprises a three-level circuit topology, a customized power semiconductor module and a cross current sensorless parallel control. The innovative circuit topology results in an UPS with higher efficiency and dramatic...
This paper discusses design and realization of a novel green-oriented double conversion uninterruptible power supply (UPS). The benefits of three-level topology for low voltage circuits are provided as a motivation for its application in UPS systems. To further boost the advantages of the three-level structure, a customized IGBT power module promotes lower electrical and thermal stresses as well as...
The proposed paper intends to investigate the benefits of using multilevel converters in high fundamental frequency applications as high speed electric drives, with particular reference to the energy recovering from gas exhaust in automotive systems. Waveforms and THD comparison of conventional two-level sine wave and neutral point clamped converters have been developed and investigated by means of...
In this paper, two control strategies for three-phase series-parallel uninterruptible power supplies are compared. A series-parallel UPS consists of a parallel and a series converter. In this topology, most power required by load is supplied directly from AC line during standby mode. Therefore the overall efficiency is higher than that of a conventional UPS. Traditionally, the control strategy of...
The paper analyzed in detail the operation principle, mathematical modes and distinct control manner using synchronous reference frame (SRF) of a three-phase series-parallel double conversion UPS system. The proposed control strategy can make this kind of UPS carry out all of the control goals: sinusoidal input current with unit power factor and sinusoidal output voltage with normal value in the case...
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