CN201956698U - Intelligent compensating device for power load unbalance - Google Patents
Intelligent compensating device for power load unbalance Download PDFInfo
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- CN201956698U CN201956698U CN2011200729973U CN201120072997U CN201956698U CN 201956698 U CN201956698 U CN 201956698U CN 2011200729973 U CN2011200729973 U CN 2011200729973U CN 201120072997 U CN201120072997 U CN 201120072997U CN 201956698 U CN201956698 U CN 201956698U
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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
- Y02E40/50—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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model relates to an intelligent compensating device for power load unbalance, belonging to the technical field of power low-voltage distribution networks. The intelligent compensating device for power load unbalance comprises a central control device as well as a current and voltage sampling device, a zero sequence compensating device and a negative sequence compensating device which are all connected with the central control device in a control way, wherein the current and voltage sampling device is used for collecting current signals and voltage signals of a load circuit; the zero sequence compensating device comprises a zigzag transformer TR and an impedance dynamic regulating device; and the negative sequence compensating device comprises combination switches FK1-FK3 and all phases of grouped switching compensating capacitors. The device is capable of filtering zero sequence current within 1A in a rated unbalanced load and improving the unbalance of a three-phase current within 10% and has the advantages of high electric energy utilization ratio, loss reduction, increase of economic benefit, cost reduction, safety and reliability in running and remarkable energy-saving effect. The entire device is connected in parallel to a power grid, is convenient to install and simple in use, and is suitable for low-voltage distribution networks of mine industry, enterprises, transportation departments, residential areas and the like.
Description
Technical field
The utility model belongs to electric power low-voltage distribution network technical field, is specially the uneven intelligent compensation device of power load.
Background technology
In the traditional three-phase four-wire system distribution transformer wiring system of China, because the low pressure single-phase load can not manually be divided equally fully, the not equal a variety of causes of the load in-service factor of distribution is inevitable and cause the three-phase load energy imbalance.And this three-phase load energy imbalance must cause loss increase, power consumption efficiency to descend, zero-sequence current increases, the useful life of shortening equipment, will cause the power equipment cisco unity malfunction when serious.
Harm to transformer: the three-phase load imbalance will make transformer be in the asymmetric operation state, thereby cause the loss of transformer to increase.According to transformer operating standard regulation, the transformer neutral current that is in operation can not surpass 25% of step down side rated current.In addition, the three-phase load imbalance can cause the transformer zero-sequence current excessive, and the part metals part heats up to be increased, even causes transformer to burn.
The neutral line and neutral point voltage problem: neutral line zero-sequence current is excessive, causes that the neutral line burns, and causes neutral point voltage to be offset problems such as excessive.
Harm to power consumption equipment: imbalance of three-phase voltage will make that contrary moment of torsion increases in the motor, thereby cause motor to heat up decrease in efficiency, phenomenons such as energy consumption increase.Therefore the imbalance of three-phase voltage can cause power consumption equipment shortening in useful life, and acceleration equipment part replacement frequency increases cost of equipment maintenance.
The best split-phase reactive power compensation device of compensation effect compensates load in the market, also the reactive current in the system partly can only be mended, and it is powerless for asymmetric active current part, sometimes but make the degree of unbalance of electric current might be bigger after the reactive power compensation, so the electric industry power supply department can only adopt the adjustment of loading of the mode of artificial separated time.
From the above, the three-phase imbalance of using electricity system is very serious to the harm and the influence of transformer, electric equipment and using electricity system, especially fully effectively utilizing of electric power energy is constituted great obstacle.In supply of electric power today in short supply, the three-phase imbalance problem that solves using electricity system has been extremely urgent task.
Current AC electric power systems generally all is A, B, C three-phase, and the positive sequence of electric power system, negative phase-sequence, zero-sequence component be come according to the order of A, B, C three-phase fixed.The leading mutually B of positive sequence: A is 120 degree mutually, and the leading mutually C of B is 120 degree mutually, and the leading mutually A of C is 120 degree mutually.Negative phase-sequence: A falls behind B 120 degree mutually mutually, and B falls behind C 120 degree mutually mutually, and C falls behind A 120 degree mutually mutually.Zero sequence: the ABC three-phase phase is identical, and which is not leading mutually yet, keeps up with yet.The appearance of positive sequence, negative phase-sequence, zero sequence is in order to analyze at system voltage, when asymmetry appears in electric current, the asymmetrical component of three-phase to be resolved into symmetrical component (positive and negative preface) and zero-sequence component in the same way.So long as three-phase system just can decomposite above-mentioned three components.For ideal power system, because three is symmetrical, so the numerical value of negative phase-sequence and zero-sequence component all is zero (Here it is, and we often say the reason of having only positive sequence component under the normal condition).Make three-phase reach balance, will manage to filter the negative phase-sequence and the zero-sequence component that exist in the electrical network.This is the theoretical foundation of the uneven intelligent compensation device of design power load.
The utility model content
At the above-mentioned problems in the prior art, the purpose of this utility model is to design the technical scheme that the uneven intelligent compensation device of a kind of power load is provided, three-phase load can be effectively improved and caused electric energy loss and equipment damage can not be divided equally, the zero-sequence current and the negative-sequence current that exist in effective inhibition electrical network, reach the energy-saving and emission-reduction purpose, effectively energy savings loss.
The uneven intelligent compensation device of described power load, it is characterized in that comprising that central control unit reaches and the current-voltage sampling device of its control connection, the zero sequence compensation device, the negative sequence compensation device, the current-voltage sampling device is used to gather the electric current of load circuit, voltage signal, described zero sequence compensation device is by tortuous transformer TR, impedance dynamic adjustments device is formed, and described negative sequence compensation device is by combination switch FK1 and AB phase grouping switching compensation condenser, combination switch FK2 and BC phase grouping switching compensation condenser, combination switch FK3 and CA phase grouping switching compensation condenser are formed.
The uneven intelligent compensation device of described power load, it is characterized in that described AB phase grouping switching compensation condenser, BC phase grouping switching compensation condenser, CA phase grouping switching compensation condenser form by the ac capacitor of one group of parallel connection, this compensation condenser group adopts delta connection.
The uneven intelligent compensation device of described power load is characterized in that described tortuous transformer TR is the identical three-phase winding transformer of former and deputy limit umber of turn, Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.
The uneven intelligent compensation device of described power load is characterized in that described impedance dynamic adjustments device is made up of the A.C. contactor KM2, the reactor L1 that are connected in parallel on the circuit.
The uneven intelligent compensation device of described power load is characterized in that also comprising the total power switch K1, the zero line K switch 2 that are connected on the circuit, zero line K switch 2 and central control unit control connection.
The uneven intelligent compensation device of described power load is characterized in that also comprising the lightning protection device MOV that is connected on the circuit, lightning protection device MOV and central control unit control connection.
The uneven intelligent compensation device of described power load is characterized in that also comprising the open phase protector QX, the main contactor KM1 that are connected on the circuit, open phase protector QX, main contactor KM1 and central control unit control connection.
The uneven intelligent compensation device of described power load is characterized in that also comprising the Distribution Transformer Terminal Unit with the central control unit control connection.
The uneven intelligent compensation device of described power load, it is characterized in that also comprising cabinet, central control unit, negative sequence compensation device, zero sequence compensation device are installed in cabinet) in, the cabinet top is provided with temperature sensor and radiator fan, temperature sensor and radiator fan and central control unit control connection.
The uneven intelligent compensation device of described power load is characterized in that described current-voltage sampling device is to be separately positioned on A phase, B phase, C to reach mutually and be used for the current transformer CT that current signal is gathered on the neutral line N1
1-5, be arranged on the voltage transformer pt that A phase, B phase, C are used for voltage signal acquisition on mutually
6-8
The uneven intelligent compensation device of above-mentioned power load, can be in specified uncompensated load with the zero-sequence current filtering in 1A, the three-phase current unbalance degree is brought up in 10%, electric energy utilization rate height reduces the wastage, and increases economic efficiency, reduce cost, safe and reliable to operation, energy-saving effect is remarkable.The whole device low voltage electric network that inserts in parallel, easy for installation, use simple.This product is applicable to low-voltage networks such as industrial and mineral, enterprise, traffic and transportation sector, residential block.
Description of drawings
Fig. 1 is a system block diagram of the present utility model;
Fig. 2 is the utility model partial electrical schematic diagram;
Fig. 3 is the structural representation of tortuous transformer;
Fig. 4 is the circuit block diagram of central control unit;
Fig. 5 is a cabinet body structure schematic diagram of the present utility model;
Among the figure: 1-central control unit, 101-DSP control chip, 102-communicating circuit, 103-power circuit, 104-three-phase voltage sample circuit, 105-three-phase current sample circuit, 106-switching value input circuit, 107-zero sequence controlling output circuit, 108-negative phase-sequence controlling output circuit;
2-current-voltage sampling device, 3-zero sequence compensation device, 301-impedance dynamic adjustments device, 4-negative sequence compensation device, 5-Distribution Transformer Terminal Unit, 6-temperature sensor, 7-radiator fan, 8-cabinet.
Embodiment
Below in conjunction with Figure of description the utility model is described further.
As shown in the figure, the uneven intelligent compensation device of power load comprises central control unit 1, current-voltage sampling device 2, zero sequence compensation device 3, negative sequence compensation device 4.Described current-voltage sampling device 2 reaches mutually and is used for the current transformer CT that current signal is gathered on neutral line N1, the N2 for being separately positioned on A phase, B phase, C
1-5, be arranged on the voltage transformer pt that A phase, B phase, C are used for voltage signal acquisition on mutually
6-8, current-voltage sampling device 2 and central control unit 1 control connection.Described negative sequence compensation device 4 is made up of combination switch FK1 and AB phase grouping switching compensation condenser, combination switch FK2 and BC phase grouping switching compensation condenser, combination switch FK3 and CA phase grouping switching compensation condenser.AB phase grouping switching compensation condenser is composed in parallel by capacitor C 1, C2, C3, BC phase grouping switching compensation condenser is composed in parallel by capacitor C 4, C5, C6, CA phase grouping switching compensation condenser is composed in parallel by capacitor C 7, C8, C9, and this compensation condenser group adopts delta connection.Also can determine the number and the parameter of ac capacitor in parallel in each phase compensation capacitor according to the size of load.Combination switch FK1-FK3 and central control unit 1 control connection.
Described zero sequence compensation device 3 is made up of tortuous transformer TR, impedance dynamic adjustments device 301, impedance dynamic adjustments device 301 and central control unit 1 control connection.Described impedance dynamic adjustments device 301 is made up of the A.C. contactor KM2, the reactor L1 that are connected in parallel on the circuit.Described tortuous transformer TR is the identical three-phase winding transformer of former and deputy limit umber of turn, Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.Described tortuous transformer TR(ZigZag transformer) no-load voltage ratio is set to 1:1, and promptly former and deputy limit umber of turn is identical, like this can be so that identical with the output current of secondary induction at the electric current of former limit input.The mode of connection by tortuous transformer gets:
Ia1(t)?=?Ia2(t)
I b1 (t)?=
?I b2 (t)
I c1 (t)?=
?I c2 (t)
By former secondary no-load voltage ratio relation
I a2 (t)?=
?I b1 (t)
I b2 (t)?=
?I c1 (t)
I c2 (t)?=
?I a1 (t)
So draw;
I A1 (t)=
I B1 (t)=
I C1 (t)
The current amplitude that promptly flows into the former limit of tortuous transformer TR equates, phase place is identical, so transformer is the very low path of resistance value to zero-sequence current.So utilize this principle, in tortuous transformers connected in parallel connecting system, can make zero-sequence current no longer pass through the neutral line through tortuous transformer.The mutual interconnection of tortuous each phase winding of transformer by the magnetic flux of mutual compensation iron core, makes each phase winding form high impedance to positive sequence, negative sequence voltage, and residual voltage is formed Low ESR.In tortuous transformers connected in parallel connecting system, can make zero-sequence current through tortuous transformer and no longer by the neutral line, thereby realize the zero-sequence current compensation.And phase-splitting, grouping switching compensation condenser are adopted in the compensation of negative-sequence current, and this compensation condenser group adopts delta connection.This device not only can compensate negative-sequence current, and the reactive power of three-phase load is compensated automatically, adjusts automatically but also have at the asymmetric situation of three-phase load active power.
The uneven intelligent compensation device of above-mentioned power load; also on circuit, connect total power switch K1, lightning protection device MOV, open phase protector QX, main contactor KM1, zero line K switch 2 be set, total power switch K1, lightning protection device MOV, open phase protector QX, main contactor KM1, zero line K switch 2 respectively with central control unit 1 control connection.Open phase protector QX mainly detects three-phase voltage overvoltage, under-voltage, phase shortage, phase sequence mistake, and lightning protection device MOV carries out the lightning protection function to this device and load-side, and this device adopts Vertical Combination structure, is divided into indoor, outdoor two types of cabinets.Central control unit 1, negative sequence compensation device 4, zero sequence compensation device 3 are installed in its cabinet 8, cabinet 8 tops are provided with temperature sensor 6 and radiator fan 7, temperature sensor 6, radiator fan 7 and central control unit 1 control connection, when the temperature in the whole rack was higher than default value, radiator fan 7 was started working automatically to device radiation.Distribution Transformer Terminal Unit 5 with central control unit 1 control connection also is set in the cabinet 8, Distribution Transformer Terminal Unit 5 can information such as on-the-spot monitoring in real time transformer, equipment and operation of power networks data, by public network as: GPRS/CDMA/GSM will obtain the analysis result remote transmission of data to the main website of power office.Also can control some power consumption equipments by remote control port by main website of power office Remote or on-the-spot warning message.
Described central control unit 1 mainly is made up of DSP control chip 101, communicating circuit 102, power circuit 103, three-phase voltage sample circuit 104, three-phase current sample circuit 105, switching value input circuit 106, zero sequence controlling output circuit 107, negative phase-sequence controlling output circuit 108.Wherein, communicating circuit 102 connects DSP control chip 101 serial line interfaces, is used for scene and telecommunication; Power circuit 102 provides the working power of whole device; Three-phase voltage sample circuit 104, three-phase current sample circuit 105 connect the high precision analogue conversion mouth of DSP control chip 101, and the three-phase voltage of input, electric current are by voltage, current transformer current transformer CT
1-5And voltage transformer pt
6-8, pass through low-pass filter circuit again after, as the importation of ADC passage in the DSP; DSP control chip inside contains the ADC passage that is useful on the sampled voltage electric current, finishes the sampling to electric current and voltage.Switching value input circuit 106, zero sequence controlling output circuit 107, negative phase-sequence controlling output circuit 108 are connected with DSP control chip 101, realize the control output to negative phase-sequence, zero-sequence current, and the input of various on off state, fault amount.
Described DSP control chip 101 adopts the DSP (TMS320F2808) of TI company, 12 ADC transducers of a plurality of passages are contained in this DSP inside, 6 passages wherein, the ABC three-phase voltage current signal that is used for sampling, 2 passages be used for sampling load zero-sequence current, compensation zero-sequence current; Three-phase voltage sample circuit 104 is connected to 3 voltage transformer CT
6-8, three-phase current sample circuit 105 is connected to 5 current transformer CT
1-5, the three-phase voltage U A of input, UB, UC are through electric resistance partial pressure and 3 voltage transformer CT
6-8Load current IA, the IB of input, IC are respectively through 5 current transformer CT
1-5Amplify by the AC signal amplifying circuit of forming by single supply operational amplifier (MV358I) and precision resistance again, and the anti-aliasing filter circuit of being made up of single supply operational amplifier (MV358I) carries out low-pass filtering, sends into DSP control chip 101.DSP control chip 101 has 16 analog input channels, 16 passages can carry out synchronized sampling and conversion simultaneously, obtain various required parameters by the Digital Signal Processing flow process, each phase current and voltage effective value, power factor, zero sequence compensation amount, negative sequence compensation amount etc.Switching value input circuit 106, zero sequence controlling output circuit 107, negative phase-sequence controlling output circuit 108 are made up of integrated package (74HC14, ULN2004A), optocoupler (PS2501T), relay (APA3311), realize the monitoring to the running status of the control of combination switch and contactor and whole system.The particular circuit configurations of described communicating circuit 102, power circuit 103, three-phase voltage sample circuit 104, three-phase current sample circuit 105, switching value input circuit 106, zero sequence controlling output circuit 107, negative phase-sequence controlling output circuit 108 does not repeat them here for existing known technology.Described DSP control chip 101 is used for finishing the Control work of whole system, and concrete control method also belongs to existing known technology, does not repeat them here.
During work, the total power switch K1 that closes powers on to device, and whether open phase protector QX detects three-phase voltage normal; three-phase voltage is normal, and central control unit 1 gets electric, and main program begins self check; normal main contactor KM1 adhesive, it is bright to start indicator light, device beginning operate as normal.Through the current signal of CT1-CT5 sampling, send into DSP (TMS320F2808) through the voltage signal of CT6-CT8 sampling, obtain negative phase-sequence, zero sequence compensation amount through after the routine processes, control combination switch FK1-FK3 and impedance dynamic adjustments device 301, reality is to the automatic compensation of negative phase-sequence, zero sequence.
The uneven intelligent compensation device of above-mentioned power load has following function: by the electric current that sampling three-phase voltage, three-phase current and tortuous transformer TR and impedance dynamic adjustments device 301 are eliminated on the zero line, realize zero sequence compensation; Come balance AC, BC, AB three-phase current by AB phase grouping switching compensation condenser, BC phase grouping switching compensation condenser, CA phase grouping switching compensation condenser, realize negative sequence compensation; Come the impartial operation of balanced load thus; Function with reactive power compensation, effectively the filtering zero-sequence current can realize that also negative phase-sequence, zero sequence compensate respectively simultaneously, reaches the effect of three-phase equilibrium, can substitute reactive power compensator fully; Eliminate the electric current on the zero line, device can be sampled and be obtained real-time current on the zero line, the zero sequence compensation overload protection function, and after the zero sequence compensation balance, zero-sequence component is when dispatching from the factory default protection value, and device will quit work in 1 second; When any fault appears in fault short message alarm function, device, can detect, with short message mode fault type be informed the user then by Distribution Transformer Terminal Unit 5; Can also collect transformer and low service data of joining the secondary side electrical network, and in time upload main website; Program self check defencive function, after the device energising, whether the quiescent point of the control circuit board up-sampling circuit in the program energy automatic detection device is normal; Software and hardware double protection functions when overvoltage, under-voltage, phase shortage, when line voltage overvoltage, under-voltage, phase shortage, device quits work fast, guarantees device safety; Can and low join secondary side operation of power networks data and monitor and in time upload data transformer; Energy filtering 3 times, 9 inferior harmonic currents; Reduce the distribution transformer zero sequence impedance; Reduce the transformer additional iron losses that neutral line current brings; The winding copper loss that brings when reducing three-phase imbalance; The variation that brings when reducing three-phase imbalance; Reduce the reactive current loss, improve power factor; Prevent that the overheated transformer center line that causes of the neutral line from burning, guarantee the transformer safe operation, and then improve the useful life of transformer.
1. contrast test before and after the test data compensation sees Table 1.
Table 1 adopts the product compensation front and back data contrast records (somewhere experimental data one day) of different principle
Product effectiveness analysis: analyze with somewhere separate unit 400kVA distribution transformer, 1 three-phase imbalance device compensation arrangement need be set according to capacity.
Line loss reduces:
Then the electric energy loss of this element in 24H is
Consider the most abominable situation, bascule is the single-phase load electricity consumption before installing, and electric current only flows through single-phase and neutral conductor:
Behind the installing bascule
Line loss is reduced to the sixth before the lack of equilibrium, this is extreme case, and it is also maximum that line loss reduces amplitude, ordinary circumstance, by main application places secondary main of device or the terminal unbalance factor of main branch line is 20% to be example, by three kinds of different situations concrete analyses of load:
(1) one phase load is heavy, a phase load is light, and the third phase load when unbalance factor is 20%, approximately increases by 11% by the caused line loss of three-phase imbalance for average load;
(2) one phase loads are heavy, two phase loads are light, increase by 8% approximately by the caused line loss of three-phase imbalance;
(3) one phase loads are light, two phase loads are heavy, increase by 20% approximately by the caused line loss of three-phase imbalance.
Transformer loss:
Roughly the same line loss calculating of the total losses of three phase windings during the operation of distribution transformer three-phase imbalance.With the model is the zero sequence resistance R of SJ, 315kVA, 10kV/0.4kV transformer
0=0.122 Ω, zero sequence reactance X
0=0.174 Ω, winding resistance R
1=0.00849 Ω is an example, and as Ia=100A, Ib=200A, Ic=300A, power factor is all 0.7 mutually, and the total losses power of supplementary load loss and additional copper loss is 3.65kW.With respect to the nominal loss power 6.3kW of this transformer, loss increases about 58%.
After adopting the uneven intelligent compensation device of power load of the present invention, be expected to the low district's line loss 6% of presenting a theatrical performance as the last item on a programme of electrical network, transformer loss 3.5%, comprehensive line loss is 9.5%, is reduced to line loss 4.5%, transformer loss 2.6%, comprehensive line loss is 7.1%.
Annual by operation calculating in 8760 hours, load factor 0.6, the electricity charge are calculated by 0.6 yuan/kWh.
Saves energy=running time * load factor * rated power * comprehensive line loss slip
Single transformer can be saved every year: electric energy 7.50 * 10
4KWh
4.5 ten thousand yuans of the electricity charge
The energy consumption of device own, according to experiment test, the uneven intelligent compensation device of separate unit power load Overall Power Consumption is less than 80W, and the electricity charge in a year are 420.5 yuans.
According to average every kilowatt-hour, consume 400 gram standard coals and calculate.Every transformer can be saved 30 tons of coals, and 300 cubic metres of using water wisely reduce 21 tons of carbon dusts, 75 tons of carbon dioxide, 2.25 tons of sulfur dioxide, and 1.14 tons of oxynitrides, and energy-saving effect is obvious.
More than be that single transformer is installed the direct analysis on energy saving effect that the back produces, do not comprise the economic penalties that the user taked that electric power operator exceeds standard to power factor, as can be seen from the above results: the uneven intelligent compensation device of power load is to export under the constant prerequisite of meritorious sum, load is evenly distributed to three-phase to be exported up, at this moment zero-sequence current greatly reduces, and greatly reduces zero sequence loss and neutral point potential shift like this; Compare with the reactive power compensator on the market, its raising energy-saving effect reaches more than 30%, has improved power supply quality, has reduced current supply loss.
Claims (10)
1. the uneven intelligent compensation device of power load, it is characterized in that comprising that central control unit (1) reaches and the current-voltage sampling device (2) of its control connection, zero sequence compensation device (3), negative sequence compensation device (4), current-voltage sampling device (2) is used to gather the electric current of load circuit, voltage signal, described zero sequence compensation device (3) is by tortuous transformer TR, impedance dynamic adjustments device (301) is formed, and described negative sequence compensation device (4) is by combination switch FK1 and AB phase grouping switching compensation condenser, combination switch FK2 and BC phase grouping switching compensation condenser, combination switch FK3 and CA phase grouping switching compensation condenser are formed.
2. the uneven intelligent compensation device of power load as claimed in claim 1, it is characterized in that described AB phase grouping switching compensation condenser, BC phase grouping switching compensation condenser, CA phase grouping switching compensation condenser form by the ac capacitor of one group of parallel connection, this compensation condenser group adopts delta connection.
3. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that described tortuous transformer TR is the identical three-phase winding transformer of former and deputy limit umber of turn, Ia
1-2A advances mutually, Ia
1-1Connect Ib
2-1, Ia
2-1Connect Ic
1-1, Ia
2-2Connect Ic
2-2, Ib1
-1Connect Ic
2-1, Ib
1-2B advances mutually, Ib
2-2Connect Ic
2-2,, Ic
1-2C advances mutually, Ic
2-2Connect the N zero line.
4. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that described impedance dynamic adjustments device (301) is made up of the A.C. contactor KM2, the reactor L1 that are connected in parallel on the circuit.
5. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that also comprising the total power switch K1, the zero line K switch 2 that are connected on the circuit, zero line K switch 2 and central control unit (1) control connection.
6. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that also comprising the lightning protection device MOV that is connected on the circuit, lightning protection device MOV and central control unit (1) control connection.
7. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that also comprising the open phase protector QX, the main contactor KM1 that are connected on the circuit, open phase protector QX, main contactor KM1 and central control unit (1) control connection.
8. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that also comprising the Distribution Transformer Terminal Unit (5) with central control unit (1) control connection.
9. the uneven intelligent compensation device of power load as claimed in claim 1, it is characterized in that also comprising cabinet (8), central control unit (1), negative sequence compensation device (4), zero sequence compensation device (3) are installed in the cabinet (8), cabinet (8) top is provided with temperature sensor (6) and radiator fan (7), temperature sensor (6) and radiator fan (7) and central control unit (1) control connection.
10. the uneven intelligent compensation device of power load as claimed in claim 1 is characterized in that described current-voltage sampling device (2) reaches mutually and is used for the current transformer CT that current signal is gathered on the neutral line N1 for being separately positioned on A phase, B phase, C
1-5, be arranged on the voltage transformer pt that A phase, B phase, C are used for voltage signal acquisition on mutually
6-8
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130462A (en) * | 2011-03-18 | 2011-07-20 | 杭州得诚电力科技有限公司 | Intelligent electrical load unbalance compensation device |
| CN105375498A (en) * | 2014-08-28 | 2016-03-02 | 国网甘肃省电力公司 | Three-phase phase-change switch device |
| CN105406494A (en) * | 2015-12-02 | 2016-03-16 | 国网浙江省电力公司湖州供电公司 | Three-phase unbalance current compensation method and device for low-voltage grid |
| CN109494689A (en) * | 2017-09-12 | 2019-03-19 | Abb 瑞士股份有限公司 | Method and system for the Earth Fault Detection in distribution system |
| US11804714B2 (en) | 2021-09-28 | 2023-10-31 | Saudi Arabian Oil Company | Intelligent system for controlling and monitoring the balance condition, harmonic, and leakage current in industrial and residential areas |
-
2011
- 2011-03-18 CN CN2011200729973U patent/CN201956698U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130462A (en) * | 2011-03-18 | 2011-07-20 | 杭州得诚电力科技有限公司 | Intelligent electrical load unbalance compensation device |
| CN102130462B (en) * | 2011-03-18 | 2013-11-27 | 杭州得诚电力科技有限公司 | Intelligent electrical load unbalance compensation device |
| CN105375498A (en) * | 2014-08-28 | 2016-03-02 | 国网甘肃省电力公司 | Three-phase phase-change switch device |
| CN105406494A (en) * | 2015-12-02 | 2016-03-16 | 国网浙江省电力公司湖州供电公司 | Three-phase unbalance current compensation method and device for low-voltage grid |
| CN109494689A (en) * | 2017-09-12 | 2019-03-19 | Abb 瑞士股份有限公司 | Method and system for the Earth Fault Detection in distribution system |
| CN109494689B (en) * | 2017-09-12 | 2020-12-01 | Abb 瑞士股份有限公司 | Method and system for ground fault detection in power distribution systems |
| US10935609B2 (en) | 2017-09-12 | 2021-03-02 | Abb Schweiz Ag | Methods and systems for ground fault detection in a power distribution system |
| US11804714B2 (en) | 2021-09-28 | 2023-10-31 | Saudi Arabian Oil Company | Intelligent system for controlling and monitoring the balance condition, harmonic, and leakage current in industrial and residential areas |
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