High-power UPS inputs harmonic electric current to restrain 4 kinds of plan to compare

Use filter of harmonic of active of 6 pulse UPS+ , ％ of <5 of harmonic of input electric current (rated load) , power input factor 0.

95. This kind of configuration, although input index is first-rate, but technology still immature, existence is compensated by accident, pass the question such as compensation, bring about advocate input switch by accident the phenomenon such as tripping operation or attaint; Blemish of technology of filter of THM active harmonic is: A) , existence " compensates " problem by accident: Because its compensation answers time to be as long as 40ms above, existence " compensates " hidden trouble by accident. Should go up in input power source, executive excision / the devoted operation or the side of input upper reaches in UPS, excision that makes big load / when devoted operation, easy generation " compensate by accident " . Light person, the input harmonic electric current that causes UPS " choppy " . Serious when, the input switch " that can bring about UPS by accident tripping operation " . On the low side of B) , dependability: To 6 pulse + the UPS of active filter says, because be in,the power drive of the commutator that canal of medium, use IGBT regards its active filter as it and transformer is in charge of, on the high side of its fault rate. Contrary, to 12 pulse + the UPS of passive filter says, in the filter in it, those who use is the inductance with very high reliability and capacitance. C) , reduce systematic efficiency, raise moving cost: The systematic efficiency of active filter is: 93% the left and right sides. To 400KVA UPS and machine, in be fully loaded with reach by the input of 33% harmonic electric current undertakes compensatory condition falls, if press KW*hr= 0.

8 yuan pay the word of charge of electricity, the moving cost that in 1 year place requires to pay is: 400KVA*0.

07/3=9.

Power consumption of a year is 3KVA; 65407KW.

Hr, the pay of charge of electricity that need raises is: 65407X0.

8 yuan of =5.

20 thousand yuan. D) , increase active filter price extremely costly: Of active filter 200KVA UPS nominal input electric current is: Estimation of 303A; harmonic electric current: 0.

33*303A=100A, if want to compensate an input completely,<5% of content of harmonic electric current needs computation to compensate electric current at least: 100A; configures actually: The active filter of a 100A. Press at present every 1500-2000 yuan quote, totle drilling cost increases 150 thousand go to 200 thousand yuan, to 6 pulse 200KVA UPS, raise 60%-80% cost almost. Plan 2.

Use filter of second harmonic of 6 pulse UPS+5, if UPS commutate device is bridge of three-phase fully control commutator of 6 arteries and veins, after the close 25-33% that occupies all harmonic by the harmonic that rectification unit emerges adds harmonic filter 5 times, reduce 10% the following, power input factor 0.

9, but local reduce the harm of harmonic electric current to electrified wire netting. This kind of configuration, harmonic of input electric current still slants big, deserve to be than the requirement to dynamo capacity 1: 2 above, exist bring about a dynamo to output unusually elevatory hidden trouble; Plan 3.

Use move photograph transformer + the holiday of 6 pulse commutator 12 pulse plan, its comprise by Ups of commutator of 2 6 pulse medley into: A) the 6 pulse commutator of a standard B) moves 30 degrees of transformer + the holiday that 6 pulse commutator makes UPS of 12 pulse commutator. The surface is fully loaded with harmonic of input electric current to be 10 ％ it seems that, this kind of configuration is put in serious sheet to nod breakdown, when an UPS breakdown, the system inputs harmonic electric current to increase quickly, endanger the security of power supply system badly. Main drawback: ? ?) . Of former parts of an apparatus jerry, full little an equipment.

2) .

If the commutator of an UPS malfunctions, it is the UPS of 6 pulse with respect to change, harmonic content increases quickly.

3) .

And the control system that the control of maternal to dc line is open loop.

The input all flows cannot very good.

The harmonic electric current when carrying gently still is met very big.

4) .

Systematic enlarge allows very can difficult 5) .

Add of outfit move the product that photograph transformer is not former outfit, with primary system match inevitable too won't good.

6) .

Cover an area of an area to be able to compare big 7) .

Function is 12-15% , also be not a patch on the UPS of 12 pulse.

Plan 4.

Use filter of second harmonic of 12 pulse UPS+11, if UPS commutate device is bridge of three-phase fully control 12 pulse commutator, after adding harmonic filter 11 times, reduce 4.

5% the following, can eliminate the harm of content of harmonic electric current to electrified wire netting basically completely, the price wants petty gain relative to active filter much. Use filter of second harmonic of 12 pulse UPS+11, harmonic of input electric current is 4.

5 ％ (rated load) , power input factor 0.

95. This kind of configuration, it is the most mature to be UPS industry the most credible solution, to dynamo capacity the requirement is 1: 1.

4; Price of sex of 4 kinds of plan compares 26P+5 of plan of filter of harmonic of active of project plan 16P+THM second 412P+11 of plan of transformer of filter plan 36P+ second target of filter function harmonic is better <5% , have compensate by accident, pass the question such as compensation, bring about advocate input switch by accident tripping operation or attaint, technology still <10% of immature harmonic index is the following, power input factor 0.

9, but local reduce the harm of harmonic electric current to electrified wire netting. But index of harmonic of short of index is <10 ％ , but this kind of configuration is put in serious sheet to nod <4 of breakdown harmonic index.

5 ％ are configured this kind, it is the most mature to be UPS industry the most credible solution, to dynamo capacity the requirement is 1: 1.

4; Price level tall lowest is inferior and neuter valence comparing is general poorer difference is best be based on afore-mentioned analysises, in practice the lieutenant general commends performance optimal, dependability is highest, and prove through running practice for a long time stability is reliable, sexual price compares best 12 pulse commutator + 11 times the harmonic of harmonic filter eliminates program. CNC Milling