New generation UPS technology, the delta conversion principle

Rathmann, Sven; Warner, H.A.

doi:10.1109/ias.1996.563905

Cited by 39 publications

(20 citation statements)

References 4 publications

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“…This power will depend of the magnitude and phase of the voltage across the terminals of the series converter which will also depend of the difference between the unregulated main system voltage and the regulated output voltage generated by the shunt inverter. This characteristic assures a better efficiency for the Delta UPS, when it is compared with the off-line UPS topology, and a lower volume when it is compared with the on-line one [6], [5] and [7].…”

Section: Introductionmentioning

confidence: 99%

A study on single-phase delta UPS topological alternatives

Ghetti

Barbosa

Braga

2009

2009 Brazilian Power Electronics Conference

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In this paper, a study on single-phase Delta UPS topological alternatives is proposed for low power and low cost applications. The proposed topology has a DC-DC converter connected between the shunt inverter and the battery bank/series converter DC terminals. This modification will allow the downsizing of the DC battery bank as well as the removing of the series converter transformer. Two different topologies of the DC-DC converter were investigated and a brief comparative study is accomplished. Simulation and experimental results are presented to validate the proposed study.

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Section: Introductionmentioning

confidence: 99%

A study on single-phase delta UPS topological alternatives

Ghetti

Barbosa

Braga

2009

2009 Brazilian Power Electronics Conference

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“…2b) and passive standby UPSs (Fig. 2c) [10][11][12][13], due to their 'off-line' topology, can only reach type 2 (Fig. 1b) or 3 (which is more permissive than type 2), but never type 1.…”

Section: Introductionmentioning

confidence: 99%

Elimination of the Transfer-Time Effects in Line-Interactive and Passive Standby UPSs by Means of a Small-Size Inverter

Arias

Hernando

Lamar

et al. 2012

IEEE Trans. Power Electron.

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Abstract--The main drawback of line-interactive and passive standby uninterruptible power supplies (UPS) is the transfer time when changing from normalmode of operation to battery-mode of operation. During this time, the critical loads protected by the UPS are under the influence of the grid disturbance which forced the mode change. On the other hand, equipment protected by a double conversion UPS is never affected by any disturbance in the mains. Nevertheless, the efficiency of this topology is lower and its size and cost are considerably higher. Hence, the elimination of the transfer process between modes in line-interactive and passive standby UPSs would make them more competitive than double conversion ones in many situations. In this paper, a method for eliminating the transfer time is proposed. It is based on a half-bridge inverter with a hysteretic controller whose output voltage is only applied to the load during the transfer time. Considering the random nature of the grid failures and the short duration of the transfer time, the design and selection of the components is nothing but standard. This also leads to a non-standard hysteretic controller that needs to be fully analyzed. Experimental results are provided for a 750-W lineinteractive UPS whose transfer time of 4 ms was eliminated by the proposed system.

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“…Recently, the parallel processing topologies has become more popular. As it is inherently efficient, compact and economical, it offers numerous functions requiring a minimum number of power conversions [1][2][3][4][5][6][7]. The parallel processing system mainly controls the power flow and quality by the bi-directional voltage source inverter (VSI) since it has to control the power conversion between the dc voltage source and the grid for battery energy storage (BES) systems or/and renewable energy sources (RES) applications.…”

Section: Introductionmentioning

confidence: 99%

Operational Characteristics of Fault Current Limiting Reactor Combined with Multi-Functional Invertor

Lim

Lee

et al. 2007

2007 7th International Conference on Power Electronics and Drive Systems

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This paper deals with the fault current limiting reactor (FCLR) combined with a multi-functional inverter system, which aims at the integration of power quality improvement, uninterruptible power supply (UPS) and fault current limitation. The system consists of a FCLR with a switch and the single-phase voltage source inverter (VSI). The FCLR, which has coil 1 and coil 2 wound in parallel through pure resistance with switch, can perform the fault current limiting operation during a fault period. The multifunctional inverter is connected between coil 3 and grid, which can be operated to compensate the reactive power demanded by nonlinear and variation loads, and be controlled to provide a sinusoidal voltage at the fundamental value (220V/60Hz) for load during a grid fails. It is shown through the simulation for the its operation that the proposed system could both protect the system from over-current by a line-ground fault and outages by a grid fail (abnormal utility power condition).

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New generation UPS technology, the delta conversion principle

Cited by 39 publications

References 4 publications

A study on single-phase delta UPS topological alternatives

A study on single-phase delta UPS topological alternatives

Elimination of the Transfer-Time Effects in Line-Interactive and Passive Standby UPSs by Means of a Small-Size Inverter

Operational Characteristics of Fault Current Limiting Reactor Combined with Multi-Functional Invertor

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