Load bank elimination for UPS testing

Abstract

Resistive loads are commonly used to conduct full-load bum-in tests onUninterruptible Power Supplies (UPS), DC Switching Power Supplies, and Motor Generator back-up systems. The recirculating load bank is a new method of load testing this equipment which offers many advantages over the conventional resistive load banks. These advantages include:A. Reduced expenses due to energy savings B. Lower air conditioning requirements C. Space savings D. Lower peak power demands.This paper seeks to present a novel scheme of load testing of UPS and other AC and DC power supply equipment with minimal losses in the load bank by recirculating thc load power back to the input. This results in a net reduction of the utility input power consumption of at least 80 percent.The principle of quadrature voltagc injection (2) is used to control the power flow between two sources in HV transmission and distribution system. Methods of quadrature voltage injection is used to transfer power from the UPS to utility. Two methods of load recirculation have been analyzed and experimental results presented.

Research on Power Electronic Load: Topology, Modeling, and Control

“…Most of the researches are emphasized on how to improve the efficiency of converter while less attention is paid to the energy consumption of the load. In 1990, Suresh Gupta proposed a method that uses a transformer to adjust the active and reactive power outputted by power source so as to test the equipment [1]. The disadvantages of this idea lies in that it is hard to get an accurate current for testing and it will feed the reactive power to grid.…”

Thermal test method for high power three‐phase grid‐connected inverters

“…Many testing methods for inverters are discussed in literature [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], the development of which can be traced to the increasing use of uninterruptible power supplies (UPS) and chargers. Burn-in tests of UPS and chargers are run typically for 72 h [3,4].…”

“…The authors of [3][4][5][6][7][8][10][11][12][13][14][15] use the regenerative method. Chen et al, [4], and Gupta et al, [12] use simple passive components for regeneration. The authors of [3, 5-8, 10, 11, 13] use additional converters for regeneration with differences in their topology.…”

“…1 a and b show two generic block diagrams of a regenerative set‐up. The authors of [3–8, 10–15] use the regenerative method. Chen et al ., [4], and Gupta et al ., [12] use simple passive components for regeneration.…”

Energy recycling for electrical AC power source burn-in test

“…Recently, some methods for burn-in of power supplies and UPS's which can absorb the test energy from the tested equipment and deliver it back to the line have been proposed and demonstrated [1]- [4]. However, the present control methods do not exhibit a variety of test equipment, and there is very little in the literature which considers the burn-in test of the adjustable-speed ac motor drive, whose use is gradually increasing every year.…”