CN104201681A - Power grid filtering method for harmonic waves generated in intermediate frequency furnace of iron and steel plant - Google Patents
Power grid filtering method for harmonic waves generated in intermediate frequency furnace of iron and steel plant Download PDFInfo
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- CN104201681A CN104201681A CN201410493368.6A CN201410493368A CN104201681A CN 104201681 A CN104201681 A CN 104201681A CN 201410493368 A CN201410493368 A CN 201410493368A CN 104201681 A CN104201681 A CN 104201681A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a power grid filtering method for harmonic waves generated in an intermediate frequency furnace of an iron and steel plant. The power grid filtering method comprises the following steps of firstly, determining that transfinite harmonic frequencies generated in the intermediate frequency furnace are 5-frequency low and odd harmonic waves, 7-frequency low and odd harmonic waves and 11-frequency low and odd harmonic waves according to acquired transfinite harmonic wave conditions generated in harmonic source intermediate frequency furnaces, which are mainly used for generating harmonic waves, in various iron and steel plants; secondly, determining the capacity of the intermediate frequency furnaces of the iron and steel plants; thirdly, using different compensation modes for the intermediate frequency furnaces with different capacities, namely, using different supplementing modes for the intermediate frequency furnaces with the different capacities; and finally, mounting static var compensators in the intermediate frequency furnaces in a parallel-connection manner and restraining voltage fluctuation, voltage flicker, three-phase unbalance degree and compensation power factors so that integral power grid filtering is finished. By the filtering method, fluctuation harmonic capacity can be effectively reduced; and moreover, voltage fluctuation, voltage flicker, three-phase unbalance degree and compensation power factors can be restrained.
Description
A kind of harmonic wave producing for steel plant's intermediate frequency furnace carries out electrical network filtering method.
Technical field
The present invention relates to a kind of harmonic wave producing for steel plant's intermediate frequency furnace and carry out electrical network filtering method.
Background technology
In electric power system, be exactly the harmonic current that how to reduce or eliminate injected system to the inhibition of harmonic wave, so as harmonic voltage control within limit value.It is an importance improving the quality of power supply that Harmonious Waves in Power Systems suppresses.The method that harmonic wave is suppressed mainly contains two kinds of approach: the first kind is to start with from improving power electronic equipment, and the harmonic current that injects electrical network is reduced, and namely on harmonic source, takes measures, and avoids to greatest extent the generation of harmonic wave; Equations of The Second Kind is to utilize LC passive filter and active power filter to provide respectively frequency domain harmonic compensation and time harmonic compensation to harmonic current at the AC of power electronic equipment, and these class methods belong to the method that the harmonic wave to having produced suppresses.
The power consumption equipment of smelter have capacity large and most of for inductive load, load impact are large, play that braking is frequent, the feature such as rapidity, automaticity are high, work continuity, be the rich and influential family of electricity consumption.Power consumption equipment uses the nonlinear loads such as DC motor and current transformer driving, alternating current motor frequency conversion drive, transformer, reactor, power electronic equipment in a large number.
The smelter intermediate frequency furnace that particularly steel plant adopt and arc furnace, because its capacity is large, are large electricity consumers, and the impact of electrical network is had to very important effect.It is low that it has power factor, load or burden without work fluctuation changes greatly and sharply, produce harmful higher harmonic current, when the serious imbalance of three-phase load, there is unfavorable factor to electrical network in the negative-sequence current of generation, and the electrical network quality of power supply is worsened, jeopardize electrical network and a large number of users, also affect the production of arc furnace, intermediate frequency furnace self, make power consumption, consumption of electrode increase, thereby become one of main public hazards of electrical network.For this reason, solve harmonics and reactive compensation problem to improving grid supply quality, save electric energy, improve power consumption equipment and exert oneself, fall lower steel consumption and can play a positive role.
Intermediate frequency furnace is that three-phase main-frequency alternating current is become to direct current through rectification circuit, then is output as single-phase midfrequent AC power supply supply medium frequency response ratio through inverter circuit.The feature of intermediate frequency furnace is to approach under full load condition power factor higher, can reach 0.9(even higher), but in the time that load is lighter, its power factor is lower, is only 0.5 left and right, and generally its average power factor is higher.Conventionally, the intermediate frequency furnace of low capacity adopts 6 pulse conversion devices, and the intermediate frequency furnace of larger capacity adopts 12 pulse conversion devices.Owing to being rectification type load, when intermediate frequency furnace operation, produce a large amount of harmonic waves, the harmonic wave of generation not only has influence on self, and has influence on other loads that are connected in same supply line.
So need a kind of electrical network filtering method that can solve well as the improvement of the harmonic source of intermediate frequency furnace, arc furnace and so on.
Summary of the invention
The object of the present invention is to provide a kind of harmonic content that effectively reduces fluctuation; The harmonic wave producing for steel plant's intermediate frequency furnace that can suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor simultaneously carries out electrical network filtering method.
For achieving the above object, technical scheme of the present invention is: a kind of harmonic wave producing for steel plant's intermediate frequency furnace carries out electrical network filtering method, comprise the steps,
Step S1: according to the harmonic wave situation that transfinites that in the each steel plant that gather, the main harmonic source intermediate frequency furnace that produces harmonic wave produces, the harmonic number that transfinites that known intermediate frequency furnace produces is mainly low order odd harmonic 5,7,11 times;
Step S2: the capacity that judges the intermediate frequency furnace adopting in each steel plant;
Step S3: for different capabilities intermediate frequency furnace, adopt different compensation ways, concrete compensation process is as follows;
For the compensation of low capacity intermediate frequency furnace, adopt low-pressure side compensation way, in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excise this low-voltage filter device with the start-stop of intermediate frequency furnace;
For the compensation of large capacity intermediate frequency furnace, adopt high-pressure side compensation to compensate complementary mode with low-pressure side,
Low-pressure side compensation: in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excises this low-voltage filter device with the start-stop of intermediate frequency furnace;
High-pressure side compensation: filter is set in 35kV bus bar side, and filter is established three filtering channels 5,7,11 times, be made up of one group of capacitance component and one group of reactor being arranged on framework at every passage, described capacitance component is made up of lightning arrester, instrument transformer, fuse, discharge coil and filter capacitor;
Step S4: to intermediate frequency furnace installing in parallel static passive compensation device, suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor, complete overall grid filtering.
Compared to prior art, the present invention has following beneficial effect: filtering method of the present invention not only can effectively reduce the harmonic content of fluctuation; Can suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor simultaneously; This filtering method has great dissemination.
Brief description of the drawings
Fig. 1 is the flow chart that the present invention is directed to harmonic wave that steel plant intermediate frequency furnaces produces and carry out electrical network filtering method.
Fig. 2 is filter and system impedance characteristics figure.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
As shown in Figure 1, a kind of harmonic wave producing for steel plant's intermediate frequency furnace of the present invention carries out electrical network filtering method, comprise the steps,
Step S1: according to the harmonic wave situation that transfinites that in the each steel plant that gather, the main harmonic source intermediate frequency furnace that produces harmonic wave produces, the harmonic number that transfinites that known intermediate frequency furnace produces is mainly low order odd harmonic 5,7,11 times;
Step S2: the capacity that judges the intermediate frequency furnace adopting in each steel plant;
Step S3: for different capabilities intermediate frequency furnace, adopt different compensation ways, concrete compensation process is as follows;
For the compensation of low capacity intermediate frequency furnace, adopt low-pressure side compensation way, in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excise this low-voltage filter device with the start-stop of intermediate frequency furnace;
For the compensation of large capacity intermediate frequency furnace, adopt high-pressure side compensation to compensate complementary mode with low-pressure side,
Low-pressure side compensation: in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excises this low-voltage filter device with the start-stop of intermediate frequency furnace;
High-pressure side compensation: filter is set in 35kV bus bar side, and filter is established three filtering channels 5,7,11 times, be made up of one group of capacitance component and one group of reactor being arranged on framework at every passage, described capacitance component is made up of lightning arrester, instrument transformer, fuse, discharge coil and filter capacitor;
Step S4: to intermediate frequency furnace installing in parallel static passive compensation device, suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor, complete overall grid filtering.
Be below specific embodiments of the invention.
embodiment mono-:
Harmonic wave control for jumbo intermediate frequency furnace can adopt two schemes: low-voltage filter Compensation Design scheme and hv filtering Compensation Design scheme.Low-voltage filter Compensation Design scheme refers in the filtering of rectifier transformer low-pressure side, and every transformer is installed a set of low-voltage filter device, drops into or excision with the start-stop of stove.Hv filtering Compensation Design scheme is in the filtering of system 35kV side.Owing to adopting hv filtering to have advantages of that cost is low, can reduce most of burden for user; Because high-pressure side harmonic content is more much smaller than low pressure, can adopt compared with low capacity simultaneously, also just easily be issued to filter effect in not overcompensation situation, adopt hv filtering Compensation Design scheme so this is built along the harmonic wave control of steel plant.
Concrete scheme is as follows:
Establish a set of TAL35-3600-5 at 35kV bus, 7,11 filters, filter is established three filtering channels 5,7,11 times, and electric capacity installed capacity is 3600kVar altogether.Adopt three-phase hollow filter reactor, three-phase filtering capacitor.
Every passage is made up of one group of capacitance component and one group of reactor being arranged on framework, and capacitance component comprises lightning arrester, instrument transformer, fuse, discharge coil and filter capacitor composition.Package unit can be made indoor, also can make outdoor type.
Need increase a high-tension switch cabinet in 35kV bus bar side, guide on filter with cable.Filter should be established overcurrent, fast tripping protection, and has open-delta protection electric capacity internal fault; Filter erection space is got by 6 × 12m.
Capacity of short circuit is calculated to gained system data and harmonic data substitution system emulation, after obtaining putting into operation by such scheme device, injected system harmonic current and 35kV bus harmonic voltage are in table 1, filter and system impedance characteristics as shown in Figure 2, have knownly met standard GB/T/T14549-93 through filtering harmonic wave after treatment.
The actual test of harmonic wave control:
Existing 4 converters, concentrate improvement in 35kV side.According to on-site actual situations, test process divides following several different operating mode, is described below:
One: 4 converter standard-sized sheet of operating mode, exits all filters;
Two: 4 converter standard-sized sheets of operating mode, drop into all filters.
Test adopts PS-6 power quality analyzer (the instrument sequence number of dispatching from the factory: 300018) of the PQPT1000 power quality analyzer that Switzerland LEM instrument and meter company produces (instrument dispatch from the factory sequence number: PQA79666) and the production of Anhui development Science and Technology Ltd..
Test signal is drawn from (or instrument is used) PT, CT secondary side for each measuring point metering, at the voltage channel of PT secondary side extraction voltage holding wire access in parallel instrument, utilize the testing current pincers of instrument from the current channel of CT secondary side extracted current signal access instrument.
(1) test data
The harmonic voltage of operating mode one and operating mode two and harmonic wave practical measurement of current data are respectively as following table 2-7(note: in table, be with * person for the value that exceeds standard, lower same).
(2) test result and analysis
Under two kinds of operating modes, 35kV bus harmonic voltage aberration rate actual measurement statistical value and harmonic current actual measurement statistical value are listed in respectively table 2-7.According to drawing the analysis of above data:
A) in operating mode one situation, inject 11,13,16,18,20,21,22,23,25 subharmonic currents that exceed GB limit value to electrical network, wherein 11 subharmonic currents are about 5.7% of first-harmonic, 13 subharmonic currents are about 3.9% of first-harmonic, cause 35kV bus 11,13 subharmonic voltage aberration rates and harmonic voltage resultant distortion rate all to exceed GB limit value.
B) in operating mode two situations, 11 times, 13 subharmonic currents are declined to a great extent, and meet GB requirement, and each harmonic voltage and harmonic voltage resultant distortion rate meet GB requirement.
As can be seen here, the above-mentioned harmonic wave control to large capacity intermediate frequency furnace reaches requirement.
embodiment bis-:
The intermediate frequency furnace harmonic wave control of low capacity adopts low-pressure side harmonic wave control scheme, in the present embodiment, on 6 six arteries and veins rectification stoves, configures 6 cover filters.
The content of this test is 35kV bus harmonic voltage and user's harmonic current.(wherein two stoves become 12 arteries and veins rectifications to existing 8 intermediate frequency furnaces, do not install filter; All the other 6 stoves become 6 arteries and veins rectifications, and filter is all housed), according to on-site actual situations, test process divides three kinds of different operating modes, describes as follows:
One: 6 six arteries and veins rectification furnace zone filters of operating mode put into production, and 2 12 arteries and veins rectification stoves are produced simultaneously;
Operating mode two: keep the intermediate frequency furnace of operating mode one situation that puts into operation, exit all filters;
Three: 8 intermediate frequency furnaces of operating mode put into production entirely, and 6 cover filters all drop into.
PS-6 power quality analyzer (the instrument sequence number of dispatching from the factory: 300145) that test adopts Anhui development Science and Technology Ltd. to produce.
Test signal is drawn from (or instrument is used) PT, CT secondary side for each measuring point metering, at the voltage channel of PT secondary side extraction voltage holding wire access in parallel instrument, utilize the testing current pincers of instrument from the current channel of CT secondary side extracted current signal access instrument.
In listed harmonic wave test result statistical form, maximum is in test measured maximum of period in the back; 95% value, for these all measured values of test period are arranged by descending order, is given up 5% large value above, gets the maximum in residue measured value.GB regulation is worth mutually by one of maximum in the large value of 95% probability of each phase measured value, as judging whether harmonic wave exceedes the foundation of permissible value.
(2) test data
The harmonic voltage of operating mode one, two, three and harmonic wave practical measurement of current data are as following table 8-13.
?8
(2) test result and analysis
Under these three kinds of operating modes, 35kV bus harmonic voltage aberration rate actual measurement statistical value and user's special line Gannan line harmonics practical measurement of current statistical value are listed in respectively table 8～table 13.According to drawing the analysis of above data:
A) in operating mode one, (6 six arteries and veins rectification furnace zone filters put into production, 2 12 arteries and veins rectification stoves are produced simultaneously) situation under, inject 15,16,21,22 subharmonic currents that exceed standard to electrical network, 35kV bus each harmonic voltage distortion rate does not all exceed standard, but harmonic voltage resultant distortion rate is slightly higher than GB.
B) (keep the intermediate frequency furnace of operating mode one situation that puts into operation in operating mode two, exit all filters) situation under, inject 5,7,11,13,14,15,16,17,18,19,20,22,24 subharmonic currents that exceed standard to electrical network, wherein with 5,7 subharmonic current maximums, cause 35kV bus 5 subharmonic voltage aberration rates and harmonic voltage resultant distortion rate to exceed standard, and harmonic voltage resultant distortion rate exceed standard larger.
C) in operating mode three, (8 intermediate frequency furnaces all put into production, 6 cover filters all drops into) situation under, inject 20,21,22 subharmonic currents that exceed standard to electrical network, 35kV bus each harmonic voltage distortion rate does not all exceed standard, and harmonic voltage resultant distortion rate is within the scope of GB.
The input of filter has obtained good filter effect, fundamentally change the injection topmost harmonic current of electrical network (inject be 5,7 times) of 5,7 subharmonic currents to electrical network, the higher harmonics electric currents such as 11,13 have also been had to certain filtration result.
Though above-mentioned two embodiment all reach requirement, but consider in the time of normal production and can cause the adverse effects such as high order harmonic component, voltage fluctuation and flickering, three-phase voltage and current imbalance, power factor are low to electrical network, and exceed the national standard of power quality indexes, threaten the safe and stable operation of electrical network, also the power supply quality of electrical network will be affected, so also need intermediate frequency furnace installing in parallel static passive compensation device, to suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor, complete overall grid filtering
Be more than preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention, when the function producing does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (1)
1. the harmonic wave producing for steel plant's intermediate frequency furnace carries out an electrical network filtering method, it is characterized in that: comprise the steps,
Step S1: according to the harmonic wave situation that transfinites that in the each steel plant that gather, the main harmonic source intermediate frequency furnace that produces harmonic wave produces, the harmonic number that transfinites that known intermediate frequency furnace produces is mainly low order odd harmonic 5,7,11 times;
Step S2: the capacity that judges the intermediate frequency furnace adopting in each steel plant;
Step S3: for different capabilities intermediate frequency furnace, adopt different compensation ways, concrete compensation process is as follows;
For the compensation of low capacity intermediate frequency furnace, adopt low-pressure side compensation way, in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excise this low-voltage filter device with the start-stop of intermediate frequency furnace;
For the compensation of large capacity intermediate frequency furnace, adopt high-pressure side compensation to compensate complementary mode with low-pressure side,
Low-pressure side compensation: in the filtering of rectifier transformer low-pressure side, every transformer is installed a set of low-voltage filter device, drops into or excises this low-voltage filter device with the start-stop of intermediate frequency furnace;
High-pressure side compensation: filter is set in 35kV bus bar side, and filter is established three filtering channels 5,7,11 times, be made up of one group of capacitance component and one group of reactor being arranged on framework at every passage, described capacitance component is made up of lightning arrester, instrument transformer, fuse, discharge coil and filter capacitor;
Step S4: to intermediate frequency furnace installing in parallel static passive compensation device, suppress voltage fluctuation, voltage flicker, tri-phase unbalance factor, compensation power factor, complete overall grid filtering.
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Cited By (3)
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| CN110716448A (en) * | 2019-10-14 | 2020-01-21 | 国网山东省电力公司莱芜供电公司 | Simulation performance test method and device for active power filter of medium-frequency electric furnace and readable storage medium |
| CN111832243A (en) * | 2020-07-25 | 2020-10-27 | 无锡特力堡电气有限公司 | Design simulation tool and method for introducing passive filtering compensation of actually measured electric energy parameters |
| CN113258560A (en) * | 2021-04-19 | 2021-08-13 | 淮阴工学院 | Electric energy quality optimization virtual simulation platform based on operation scene of electric arc furnace in steel plant |
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