Novel ways to improve rectifier performance from power systems' reliability viewpoint

Suntio, Teuvo; Keränen, Tommi; Tulkki, J.

doi:10.1109/intlec.1993.388471

Proceedings of Intelec 93: 15th International Telecommunications Energy Conference

DOI: 10.1109/intlec.1993.388471

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Novel ways to improve rectifier performance from power systems' reliability viewpoint

Teuvo Suntio¹,

Tommi Keränen²,

J. Tulkki³

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Cited by 4 publications

References 13 publications

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A high-performance integrated power plant

Boost¹,

Nicklaus²

Proceedings of Intelec 94

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Outside plant applications for dc bulk power systems have mushroomed over recent years. As a result, increasing focus has been brought to bear on the power system to increase its flexibility for a wider variety of applications. Moreover, since the use of advanced technology such as valve-regulated lead-acid (VRLA) batteries and switched-mode rectifiers in the outside plant area is relatively new, a number of growing pains are now emerging. Consequently, feature requirements of dc bulk power plants have increased beyond basic charger modularity and hgher MTBF.Addressing mechanical flexibility, electrical subcomponent compatibility, environmental stresses, and emergency situation control, this paper proposes the design of an integrated power plant, capable of accommodatmg virtual zero-time plant growth and service, upgraded battery life, emergency situation control, and numerous performance enhancements.Selected theoretical design results have been simulated and experimentally verified using a 9kW engineering prototype.

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A high-performance integrated power plant

Boost¹,

Nicklaus²

Proceedings of Intelec 94

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Constant-current vs. constant-power protected rectifier as a DC UPS system's building block

Suntio¹,

Glad²,

Waltari³

Proceedings of Intelec'96 - International Telecommunications Energy Conference

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Shape of Battery Capacity-Life Curve as a Decisive Decision-Making Parameter

Suntio

Waltari²,

Rajamäki³

1994

TELESCON '94 - The First International Telecommunications Energy Special Conference

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FINLAND 7The end of useful battery life is normally deflated as the point at which battery capacity has reduced ca. 20 % from ihe nominal value. This aging is typically taken into account by multiplying the back-up timne value by a factor of 1.25. The effect of capacity reduction on back-up time depends, however, on the lnght of the discharge time. If thze discharge time is in the order of hours, then the 20 % reduction of capacity results in ca. 20 % reduction of back-up tinm. If the discharge time is in the order of 10 minutes then xte effect could be ca. 50 % reduction of back-up time. 77Tis means that a 25 % increase in back-up time is not sufficient in this case.Tfhe shape of battery capacity-life curve is mare important tiwta people normally hiink 7Their thinking is affected by the experience gained from the use offlooded batteries: The actual capacity of a battery is often higjer than nominal after the use of 10 yrs and the reduction is very gradual even after this. In the case of VRbatteries the shape of capacity-life curve can be quite differentfrom that offlooded batteries The rate of capacity reduction can increase along the lift anid be very steep at the end of life. This raises a questioni whether the aginig can be taken into accouilt feasibly at all. t1 is aiso evident that the monwiloring of battery condition w>ill be rore anid more essetilial to be able to replace the batteries in time to avoid unexpected system shut downs.T7his paper discusses the matters referred above nore in detail from the user's viewpoint anid suggest acions to be taken to avoidfatal consequences.

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Novel ways to improve rectifier performance from power systems' reliability viewpoint

Cited by 4 publications

References 13 publications

A high-performance integrated power plant

A high-performance integrated power plant

Constant-current vs. constant-power protected rectifier as a DC UPS system's building block

Shape of Battery Capacity-Life Curve as a Decisive Decision-Making Parameter

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