CN202068196U - Passive filter reactive compensation device of rolling mill - Google Patents
Passive filter reactive compensation device of rolling mill Download PDFInfo
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- CN202068196U CN202068196U CN2011202002925U CN201120200292U CN202068196U CN 202068196 U CN202068196 U CN 202068196U CN 2011202002925 U CN2011202002925 U CN 2011202002925U CN 201120200292 U CN201120200292 U CN 201120200292U CN 202068196 U CN202068196 U CN 202068196U
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- compensation
- branch road
- harmonic
- reactive power
- compensation branch
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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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Abstract
The utility model relates to a passive filter reactive compensation device of a rolling mill, comprising a controller, a switching executing mechanism and a plurality of filter reactive compensation branches. The passive filter reactive compensation device of the rolling mill is characterized in that the filter reactive compensation device comprises a single tuned filter reactive compensation branch 3 and a series reactor untuned reactive compensation branch, wherein, Q (adjustment)= Q (total)- (summation of Q<n>), in the formula, the Q(total) represents a system compensation total amount, Q<n> represents the harmonic compensation amount of the single tuned filter reactive compensation branch 3 of which the characteristic harmonic frequency is n; the controller employs a harmonic preference switching mode, namely, a harmonic compensation branch is switched firstly, and then a reactive regulation branch is switched, when the branches are switched out, the order is reverse. Because a reactor of certain reactance ratio is in series in a parallel capacitor branch, a resonance point is changed, avoiding various harmonics contained in a harmonic source, so that the resonance is not generated, and a resonance current is not amplified, thereby preventing the capacitor from being damaged or the failure of the controller.
Description
Technical field
The utility model relates to a kind of power supply compensation arrangement, particularly a kind of milling train passive filtering reactive power compensator.
Background technology
It is that power is low, harmonic current is big that characteristics are mainly wanted in the electricity consumption of direct current milling train, and the voltage resultant distortion is not very high.Require filter to satisfy state's index and reach GB/T14549-93 " public electric wire net harmonic wave " standard-required, satisfy the reactive power compensation requirement again, promptly power factor (PF) reaches the requirement of power department.The method for designing of traditional filtering compensation is by all being designed to the requirement that the single tuning filter branch satisfies filtering and power factor according to total idle amount, but this mode can cause cost to improve greatly.
Summary of the invention
The purpose of this utility model is to provide in order to overcome prior art and economic deficiency a kind of filtering, compensation effect good, the milling train passive filtering reactive power compensator that cost is low.
For achieving the above object, the utility model provides following technical scheme: a kind of milling train passive filtering reactive power compensator, comprise controller, switching actuator and some filter reactive compensation branch roads, it is characterized in that: described filter reactive compensation device comprises single tuning filter reactive compensation branch road 3 and series reactor nonresonant reactive power compensation branch road, and wherein the harmonic compensation total amount of single tuning filter reactive compensation branch road 3 is: ∑ Qn=∑ U
SIn, wherein In is the harmonic current value of n characteristic harmonics, U
SBe system voltage, the compensation total amount of series reactor nonresonant reactive power compensation branch road is: Q adjusting=Q is total-and ∑ Qn, Q always is the system balance total amount in the formula, Qn is the single tuning filter reactive compensation branch road 3 harmonic compensation amounts of n for the characteristic harmonics number of times; Described controller comprises current-voltage sampling unit 4, real-time current voltage sample value memory cell, switching threshold value memory cell, comparator and data processing unit, described comparator compares the real-time current voltage sample value memory cell of load 1 and the size of the value in the switching threshold value memory cell, described controller is controlled single tuning filter reactive compensation branch road 3 and series reactor nonresonant reactive power compensation branch road input according to the comparative result of described comparator or is cut out, and described controller is controlled switching actuator in the preferential mode of harmonic wave.
Adopt technique scheme, because in the shunt capacitor branch road behind the reactor of the certain reactance Rate of series connection, the resonance frequency of itself and system is: nL=(XC/XL+Xs)
1/2, therefore resonance point is lower than the harmonic number that does not seal in reactor, has avoided the harmonic wave that is comprised in the harmonic source, can not produce resonance, and electric current can not become greatly, thereby has avoided causing capacitor damage or controller malfunctioning.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the utility model specific embodiment system schematic.
Embodiment
Milling train passive filtering reactive power compensator comprises controller, switching actuator 2 and some filter reactive compensation branch roads, described filter reactive compensation device comprises single tuning filter reactive compensation branch road 3 and series reactor nonresonant reactive power compensation branch road 5, and wherein the harmonic compensation total amount of single tuning filter reactive compensation branch road 3 is: ∑ Qn=∑
U
SIn, wherein In is the harmonic current value of n characteristic harmonics, U is a system voltage, the compensation total amount of series reactor nonresonant reactive power compensation branch road 5 is: Q adjusting=Q is total-and ∑ Qn, Q always is the system balance total amount in the formula, Qn is the single tuning filter reactive compensation branch road 3 harmonic compensation amounts of n for the characteristic harmonics number of times, Qn=
U
SIn, wherein In is the harmonic current value of n characteristic harmonics, U
SBe system voltage, the harmonic current value of each characteristic harmonics number of times both can obtain by the actual measurement mode, the current mode harmonic source also can by In=I1/ n(wherein I1 be the fundamental current value) mode estimate.What harmonic content was bigger in the general power supply mainly is 5,7,11 times, be n=5,7,11, described controller comprises current-voltage sampling unit 4, real-time current voltage sample value memory cell, switching threshold value memory cell, comparator and data processing unit, described comparator compares the real-time current voltage sample value memory cell of load 1 and the size of the value in the switching threshold value memory cell, described controller drops into or cuts out according to the comparative result control single tuning filter reactive compensation branch road 3 and the series reactor nonresonant reactive power compensation branch road 5 of described comparator, described controller is controlled switching actuator 2 in the preferential mode of harmonic wave, be that data processing unit at first calculates the reactive power compensation amount according to the sampled value of real-time current voltage sample value memory cell, when reactive power compensation amount during greater than the switching threshold value, at first drop into Qn(harmonic compensation branch road), as still not enough, then Q regulated (idle adjusting branch road) and drop into; Data processing unit calculates when crossing the benefit state according to the sampled value of real-time current voltage sample value memory cell, then earlier Q is regulated excision, still is benefit, then Qn is excised again.In order to improve degree of regulation, the Q adjusting can be divided into 3-5 series reactor nonresonant reactive power compensation branch road 5.Series reactor nonresonant reactive power compensation branch road 5 is composed in series by inductive reactance xl n and XCn capacitive reactance, when the minimum main harmonic number of system is 3 times, XL3=12 ~ 14%XC3 in the series reactor nonresonant reactive power compensation branch road 5, when the minimum main harmonic number of system is 5 times, XL5=5.5 ~ 7%XC5 in the series reactor nonresonant reactive power compensation branch road 5, current-voltage sampling unit 4 and switching actuator 2 in the filter are technology of a comparative maturity, no longer carefully state herein.It is that core and peripheral cell thereof constitute that real-time current sampled value memory cell, switching current threshold memory cell, comparator and data processing unit can adopt with little process chip, and comparator is realized by internal processes, repeats no more herein.
The main mill of the cold rolling system of big steel band of model direct current of Zhejiang steel band Co., Ltd adopts three-winding transformer, and no-load voltage ratio is 10KV/0.66KV, S
T=1500KVA, and direct current volume milling train and other auxiliary equipment adopt two winding transformers, capacity is 1500KVA, no-load voltage ratio is 10KV/0.4KV.This transformer after tested, 5,11,13 subharmonic are big, power factor is low, the reactive power breach is big, specific as follows shown in: I
Always=2208A I
5=441A I
11=226A I
13=170A cos φ
1=0.6, power factor mends 0.95, i.e. cos φ
2=0.95, β is load 1 coefficient, gets 0.9, Q is total=and S
Tβ cos φ
1(tan φ
1-tan φ
2)=886.4KV
ArS wherein
TBe transformer capacity, φ
1And φ
2Be respectively before compensating and the power factor angle after requiring to compensate, consideration is fully loaded and leave 1.2 times of surpluses, and 1080KV is mended in decision
ArAccording to ∑ Qn=∑ n and Q adjusting=Q total-∑ Qn, minimum main harmonic number is 5 times in the native system, XL5 in the series reactor nonresonant reactive power compensation branch road 5 can select between 5.5 ~ 7%XC5, XL5=6%XC5 in this specific embodiment, we can obtain harmonic compensation ∑ Qn=640KV
Ar, regulate idle amount Q adjusting=440KV
Ar, need the total amount Q of compensation total=1080KV
ArWherein Q5 is 4 * 80=320 KV
Ar, Q11 is 2 * 80=160K V
Ar, Q13 is 2 * 80=160KV
ArIdle governing stage is divided into 1,2,4,4 common level Four in this specific embodiment, is arranged to 40 KV respectively
Ar, 80 KV
Ar, 160 KV
Ar, 160K V
ArIn this programme, current sampling unit is the total current sampling mechanism, and the sample point of described current sampling unit is between power supply 1 and compensation arrangement.Controller is foundation with the total current, adopts the preferential switching mode of harmonic wave, promptly throws the harmonic compensation branch road earlier, throws idle adjusting branch road again, when cutting out, and reversed in order then.
Claims (4)
1. milling train passive filtering reactive power compensator, comprise controller, switching actuator and some filter reactive compensation branch roads, it is characterized in that: described filter reactive compensation device comprises single tuning filter reactive compensation branch road (3) and series reactor nonresonant reactive power compensation branch road, and wherein the harmonic compensation total amount of single tuning filter reactive compensation branch road (3) is: ∑ Qn=∑
U
SIn, wherein In is the harmonic current value of n characteristic harmonics, U
SBe system voltage, the compensation total amount of series reactor nonresonant reactive power compensation branch road is: Q adjusting=Q is total-and ∑ Qn, Q always is the system balance total amount in the formula, Qn is single tuning filter reactive compensation branch road (3) the harmonic compensation amount of n for the characteristic harmonics number of times; Described controller comprises current-voltage sampling unit (4), real-time current voltage sample value memory cell, switching threshold value memory cell, comparator and data processing unit, described comparator compares the real-time current voltage sample value memory cell of load (1) and the size of the value in the switching threshold value memory cell, described controller is controlled single tuning filter reactive compensation branch road (3) and series reactor nonresonant reactive power compensation branch road input according to the comparative result of described comparator or is cut out, and described controller is controlled switching actuator in the preferential mode of harmonic wave.
2. milling train passive filtering reactive power compensator according to claim 1 is characterized in that: described Q regulates and is divided into 3-5 series reactor nonresonant reactive power compensation branch road.
3. milling train passive filtering reactive power compensator according to claim 1, it is characterized in that: when the minimum main harmonic number of system is 3 times, XL3=12 ~ 14%XC3 in the series reactor nonresonant reactive power compensation branch road, when the minimum main harmonic number of system is 5 times, XL5=5.5 ~ 7%XC5 in the series reactor nonresonant reactive power compensation branch road.
4. milling train passive filtering reactive power compensator according to claim 1 is characterized in that: described current sampling unit is the total current sampling mechanism, and the sample point of described current sampling unit is between power supply and compensation arrangement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202002925U CN202068196U (en) | 2011-06-14 | 2011-06-14 | Passive filter reactive compensation device of rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202002925U CN202068196U (en) | 2011-06-14 | 2011-06-14 | Passive filter reactive compensation device of rolling mill |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684205A (en) * | 2012-05-21 | 2012-09-19 | 南京理工大学 | Harmonic reactive compensation control method based on current harmonic on-line estimation |
| CN102709914A (en) * | 2012-07-09 | 2012-10-03 | 上海稳利达科技股份有限公司 | Filtering and reactive power compensation controller and compensation control method for power system |
| CN106329542A (en) * | 2015-07-10 | 2017-01-11 | 美登思电气（上海）有限公司 | Control method and system for reactive power compensation device |
| CN111505966A (en) * | 2020-03-17 | 2020-08-07 | 洛阳和远控制系统有限公司 | Electrical control method and device for producing plate and strip |
-
2011
- 2011-06-14 CN CN2011202002925U patent/CN202068196U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684205A (en) * | 2012-05-21 | 2012-09-19 | 南京理工大学 | Harmonic reactive compensation control method based on current harmonic on-line estimation |
| CN102709914A (en) * | 2012-07-09 | 2012-10-03 | 上海稳利达科技股份有限公司 | Filtering and reactive power compensation controller and compensation control method for power system |
| CN102709914B (en) * | 2012-07-09 | 2015-03-04 | 上海稳利达科技股份有限公司 | Filtering and reactive power compensation controller and compensation control method for power system |
| CN106329542A (en) * | 2015-07-10 | 2017-01-11 | 美登思电气（上海）有限公司 | Control method and system for reactive power compensation device |
| CN111505966A (en) * | 2020-03-17 | 2020-08-07 | 洛阳和远控制系统有限公司 | Electrical control method and device for producing plate and strip |
| CN111505966B (en) * | 2020-03-17 | 2024-04-16 | 洛阳和远控制系统有限公司 | Electrical control method and device for producing plate strip |
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