CN103078320A - Method for treating high-voltage harmonic source - Google Patents
Method for treating high-voltage harmonic source Download PDFInfo
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- CN103078320A CN103078320A CN201210469735XA CN201210469735A CN103078320A CN 103078320 A CN103078320 A CN 103078320A CN 201210469735X A CN201210469735X A CN 201210469735XA CN 201210469735 A CN201210469735 A CN 201210469735A CN 103078320 A CN103078320 A CN 103078320A
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- reactive 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
Abstract
The invention discloses a method for treating a high-voltage harmonic source. The high-voltage harmonic source is treated after a low-voltage reactive compensation device is serially connected with a power system transformer. The method comprises the steps of: 1, connecting the low-voltage reactive compensation device into a low-voltage bus of a power system, and obtaining an equivalent circuit diagram; 2, according to the equivalent circuit diagram, writing an equivalent fundamental wave reactance expression formula of the low-voltage reactive compensation device at a high-voltage side; 3, enabling the equivalent harmonic reactance expression formula of a corresponding low-voltage reaction compensation branch at the high-voltage side to be 0 according to the filtering times of the equivalent fundamental wave reactance expression formula; and 4, solving a nonlinear equation system with the inductance reactance of each low-voltage reactive compensation branch as an unknown number, taking the corresponding real number solution to obtain a parameter of each low-voltage reactive compensation branch. According to the invention, a filter system is constructed by only purchasing the low-voltage device so that the high-voltage harmonic source can be treated, the capacity of a filter reactor is reduced, the high-voltage outlet interval is not occupied, the project investment is greatly reduced, and the convenience is realized in operation and maintenance.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of improvement method for the high pressure harmonic source.
Background technology
Passive filter is a kind of filter that is formed by connecting according to certain parameter configuration, certain topological structure by electric capacity and inductance element, effectively certain or some subharmonic of filtering is a kind of simple and effective filtering mode of extensive use in the modern power systems.
When adopting passive filtration unit to carry out harmonic wave control, usually that filter is directly in parallel with harmonic source, be articulated on the same bus, to obtain the optimum filtering effect.This mainly is that most of harmonic-producing load electric pressure is lower, and its voltage is generally 35kV and following, and directly parallel filtering device ratio is easier to implement, and cost is economical rationality also, and operation maintenance is simple.Yet along with the development of modern industry, increasing industrial enterprise load has directly accessed voltage levels (more than the 35kV) electrical network, such as electric railway, metallurgy industry etc., makes harmonic wave be directly injected into high-voltage system.To the harmonic source of the direct injected system voltage levels of this class, certainly can directly adopt the hv filtering device of identical electric pressure to administer such as conditions permit, and obtain good harmonic wave control effect.But the hv filtering device easily is subject to the impact of system condition in running, all can bring direct impact such as the change of power system operating mode, the variation of other harmonic-producing load.Simultaneously, its investment cost is higher, and for example 110kV switch cost approximately is about 3 times of 35kV switch, and other equipment manufacturing cost are higher equally, and its floor space is large, structure, operation maintenance also can be complicated many.
For above-mentioned high pressure (more than the 35kV) harmonic-producing load, the present invention can rationally utilize step-down transformer and low pressure (35kV and the following) reactive-load compensation equipment in the electric power system, through particular design, make the series resonance point of high voltage bus identical with the characteristic frequency of the high pressure harmonic-producing load that needs filtering, reach the regulation effect identical with direct installing high pressure (more than the 35kV) filter.The filter of this individual modulation a kind of good method of administering the high pressure harmonic wave of can yet be regarded as, but because the particularity of its structure in order to reach good filter effect, should be avoided Design of filter system is got too complicated.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of improvement method for the high pressure harmonic source, utilize the method for designing of administering high pressure harmonic source (more than the 35kV) behind the step-down transformer of low pressure (35kV and following) reactive-load compensation equipment series connection electric power system, and the characteristics when having proposed to design such filtering system, can simplify Design of filter system, reach preferably filter effect.
A kind of improvement method for the high pressure harmonic source provided by the invention, its improvements be, administers the high pressure harmonic source after utilizing the transformer of low-pressure reactive compensation devices in series electric power system, and described method comprises the steps:
(1) with the low-voltage bus bar of low-pressure reactive compensation equipment access electric power system, and obtains the equivalent circuit diagram of described filtering system access electric power system;
(2) according to described equivalent circuit diagram, row are write described low-pressure reactive compensation equipment on high-tension side equivalent fundamental reactance expression formula;
(3) according to the filter times of described equivalent fundamental reactance expression formula, make that corresponding low-pressure reactive compensation branch road is 0 on high-tension side Equivalent Harmonic reactance expression formula;
(4) Nonlinear System of Equations take low-pressure reactive compensation branch road induction reactance value as unknown number that obtains of solution procedure (3) is got corresponding real solution, can obtain the parameter of each bar low-pressure reactive compensation branch road.
Wherein, described low-pressure reactive compensation equipment is comprised of reactance and the electric capacity of series connection.
Wherein, there is not harmonic source on the low-voltage bus bar described in the step (1).
Wherein, described each bar low-pressure reactive compensation branch road is thrown together and is moved back, and perhaps makes up to throw according to a definite sequence rule according to the reactive power compensation demand and moves back.
Wherein, the current limiting low-voltage reactor of connecting between the low-voltage bus bar of the described low-pressure reactive compensation equipment of step (1) and described power system transformer.
Wherein, described low-pressure reactive compensation equipment is connected to electric power system by the step-down transformer of electric power system; The former limit of described step-down transformer is connected with described electric power system, its secondary and described low-pressure reactive compensation equipment connection.
Wherein, described low-pressure reactive compensation equipment is connected by the high voltage bus of step-down transformer with the harmonic source place.
Wherein, in order to reach good filter effect, the filter of this individual modulation is because the particularity of its structure should be avoided Design of filter system is got too complicated.Its characteristics are:
1) the low-pressure reactive compensation branch road less, the filtering harmonic number is lower, and simpler, the easy row of its design moves also more stablely, and the low-pressure reactive compensation branch road of whole system should not be above 3;
2) when main transformer outlet current limiting reactor, every cover filter capacity may be subject to certain limitation because capacity too senior general can't realize the high-pressure side is formed needed series resonance point;
3) preferably do not have harmonic source on the bus that filter is installed in, otherwise can produce comparatively serious circulation between filter branches, the filter installed capacity is strengthened.
4) in theory, preferably all low-pressure reactive compensation branch roads are thrown together and moved back for reaching the optimum filtering effect, but also can be according to reactive requirement in the actual motion, make up to throw according to a definite sequence rule and move back, and satisfy filtering requirements.
5) slightly high to the step-down transformer requirement, require it can tolerate a certain amount of harmonic current.
Compared with the prior art, beneficial effect of the present invention is:
1) proposed rationally to utilize step-down transformer and low-pressure reactive compensation equipment to administer the Design of Passive Power Filter method of high pressure harmonic source.By equivalent filtering system, make the system high pressure bus series resonance point occur in corresponding filter times, find the solution the method for the each harmonic impedance Nonlinear System of Equations real solution of high voltage bus, can conveniently obtain the Design of Passive Power Filter parameter;
2) only need purchase low-voltage equipment and make up filtering system, and the filter reactor capacity can reduce to some extent, greatly reduce construction investment.
3) do not take the high-voltage terminal interval, greatly saved the investment of land resource and building thereof.
4) equipment operating, operation, maintenance are simple, have reduced operations staff's requirement.
Description of drawings
Fig. 1 is the schematic diagram of low-pressure reactive compensation equipment access provided by the invention electric power system.Among the figure, 1 is the 220kV bus; 2 is the 110kV bus; 3 is 35(10) the kV bus; 4 is 220kV/110kV/35(10) the kV three-winding transformer; 5 is 3 times, 5 times, 7 times bank of filters; 6 is 3 times, 5 times, 7 subharmonic sources; 7 is the current limiting low-voltage reactor.
Fig. 2 is provided by the invention when utilizing in the electric power system step-down transformer that is used for other purposes to replace main transformer, the schematic diagram of low-pressure reactive compensation equipment access electric power system.Among the figure, 1 is the 220kV bus; 2 is the 110kV bus; 3 is 35(10) the kV bus, 4 is 220kV/110kV/35(10) the kV three-winding transformer; 5 is 3 times, 5 times, 7 times bank of filters; 6 is 3 times, 5 times, 7 subharmonic sources; 7 is 110kV/35(10) kV double winding step-down transformer (or three-winding transformer); 8 is other 35(10) the kV low-voltage load.
Fig. 3 is the equivalent circuit diagram of low-pressure reactive compensation equipment access provided by the invention electric power system.Among the figure, 1 is the equivalent source U of system
s2 is the equivalent resistance R of system
s3 is the equivalent inductance L of system
s4 is the total equivalent inductance L between harmonic source place high voltage bus and the low-voltage bus bar of installing filter
T5,6 inductance L that are respectively 3 low-pressure reactive compensation branch roads
3, capacitance C
37,8 inductance L that are respectively 5 low-pressure reactive compensation branch roads
5, capacitance C
59,10 inductance L that are respectively 7 low-pressure reactive compensation branch roads
7, capacitance C
711 is harmonic current source I
h
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Embodiment one:
System shown in Figure 1 comprises that 220kV(is high), among the 110kV() and 35(10) kV(is low) three electric pressures.3 times, 5 times, 7 subharmonic current sources 6 are directly injected the 110kV bus, and 2,3 times, 5 times, 7 times bank of filters 5 absorbs the harmonic current that harmonic sources 6 produce through the low-voltage bus bar 3 access 110kV buses 2 of main transformer 4.Wherein, power system transformer 4 is 220kV/110kV/35(10) the kV three-winding transformer, its three winding connects respectively (the corresponding connection that magnitude of voltage equates) with corresponding electrical network bus.The present embodiment current limiting low-voltage reactor 7 of can connecting between main transformer 4 and bank of filters 5 is protected.
Step 1: according to system shown in Figure 1, the system equivalent circuit diagram of obtaining as shown in Figure 3.Make 4(L among Fig. 3
T) fundamental reactance be x
T5(L
3), 6(C
3) corresponding fundamental reactance is x
L3, x
C37(L
5), 8(C
5) corresponding fundamental reactance is x
L5, x
C59(L
7), 10(C
7) corresponding fundamental reactance is x
L7, x
C7
Step 2: according to equivalent electric circuit Fig. 3, row are write filtering system on high-tension side equivalent fundamental reactance expression formula;
Step 3: according to filter times, make the 110kV side series resonance point occur in 150Hz, 250Hz, 3 frequencies of 350Hz, making its corresponding reactance is 0:
In the formula (2), determine the first-harmonic capacity of 3 times, 5 times, 7 times low-pressure reactive compensation branch roads according to the needs of the capacity of reactive power compensation and filter effect after, draw x
C3, x
C5, x
C7x
TInstall bus to the total equivalent reactance between the high pressure bus for filter, mainly consider the leakage reactance of transformer, can be obtained by capacity and the short-circuit impedance of transformer, when transformer low voltage side outlet current limiting reactor, also it should be taken into account; This moment x
TSummation (the necessary impact of considering whole reactance such as the transformer in the loop, current limiting reactor in the design process) for transformer leakage reactance and current limiting reactor reactance.To sum up, formula (2) is with x
L3, x
L5, x
L7Nonlinear System of Equations for unknown number.
Step 4: solution procedure 3 obtain with x
L3, x
L5, x
L7Nonlinear System of Equations (2) for unknown number.This solution of equations is not unique, obviously only has real solution just to meet and satisfies actual requirement of engineering.Can adopt the methods such as quasi-Newton method to obtain one group of real solution, as the parameter of filter reactor.
Embodiment two:
Principle and the structure of the present embodiment and embodiment one are basic identical, and as shown in Figure 2, its difference is:
Rationally utilize the step-down transformer 7 that is used for other purposes in the electric power system to replace main transformer 4, be connected high voltage bus (more than the 35kV) 2 and connect in its former limit with the harmonic source place, secondary is connected 35kV and following with low pressure) low-voltage bus bar 3 at reactive-load compensation equipment place connects.
Wherein step-down transformer is not special in filtering is equipped with, and visual power supply topological structure utilization power supply main transformer also might be the special-purpose step-down transformer that need to arrange because of other power supply.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. an improvement method that is used for the high pressure harmonic source is characterized in that, administers the high pressure harmonic source after utilizing the transformer of low-pressure reactive compensation devices in series electric power system, and described method comprises the steps:
(1) with the low-voltage bus bar of low-pressure reactive compensation equipment access electric power system, and obtains the equivalent circuit diagram of described filtering system access electric power system;
(2) according to described equivalent circuit diagram, row are write described low-pressure reactive compensation equipment on high-tension side equivalent fundamental reactance expression formula;
(3) according to the filter times of described equivalent fundamental reactance expression formula, make that corresponding low-pressure reactive compensation branch road is 0 on high-tension side Equivalent Harmonic reactance expression formula;
(4) Nonlinear System of Equations take low-pressure reactive compensation branch road induction reactance value as unknown number that obtains of solution procedure (3) is got corresponding real solution, can obtain the parameter of each bar low-pressure reactive compensation branch road.
2. improvement method as claimed in claim 1 is characterized in that, described low-pressure reactive compensation equipment is comprised of reactance and the electric capacity of series connection.
3. improvement method as claimed in claim 1 is characterized in that, does not have harmonic source on the described low-voltage bus bar of step (1).
4. improvement method as claimed in claim 1 is characterized in that, described each bar low-pressure reactive compensation branch road is thrown together and moved back, and perhaps makes up to throw according to rule according to the reactive power compensation demand and moves back.
5. improvement method as claimed in claim 1 is characterized in that, the current limiting low-voltage reactor of connecting between the low-voltage bus bar of the described low-pressure reactive compensation equipment of step (1) and described power system transformer.
6. improvement method as claimed in claim 1 is characterized in that, described low-pressure reactive compensation equipment is connected to electric power system by the step-down transformer of electric power system; The former limit of described step-down transformer is connected with described electric power system, its secondary and described low-pressure reactive compensation equipment connection.
7. improvement method as claimed in claim 1 is characterized in that, described low-pressure reactive compensation equipment is connected by the high voltage bus of step-down transformer with the harmonic source place.
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| CN201210469735.XA CN103078320B (en) | 2012-11-19 | 2012-11-19 | Method for treating high-voltage harmonic source |
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| CN201210469735.XA CN103078320B (en) | 2012-11-19 | 2012-11-19 | Method for treating high-voltage harmonic source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846430A (en) * | 2016-05-31 | 2016-08-10 | 国网北京市电力公司 | Passive filter for over 110kV high-voltage system and determination method and device of passive filter |
| CN107317336A (en) * | 2017-08-11 | 2017-11-03 | 安徽大学 | The method that parallel impedance type device administers background harmonicses |
| CN107910870A (en) * | 2017-11-24 | 2018-04-13 | 许继电气股份有限公司 | Control method and device are moved back in a kind of throwing of distribution static series compensator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846430A (en) * | 2016-05-31 | 2016-08-10 | 国网北京市电力公司 | Passive filter for over 110kV high-voltage system and determination method and device of passive filter |
| CN105846430B (en) * | 2016-05-31 | 2018-11-09 | 国网北京市电力公司 | The passive filter of 110kV or more high-pressure systems and its determining method and apparatus |
| CN107317336A (en) * | 2017-08-11 | 2017-11-03 | 安徽大学 | The method that parallel impedance type device administers background harmonicses |
| CN107317336B (en) * | 2017-08-11 | 2020-07-14 | 安徽大学 | Method for treating background harmonic wave by parallel impedance type device |
| CN107910870A (en) * | 2017-11-24 | 2018-04-13 | 许继电气股份有限公司 | Control method and device are moved back in a kind of throwing of distribution static series compensator |
| CN107910870B (en) * | 2017-11-24 | 2020-07-07 | 许继电气股份有限公司 | Switching control method and device for distributed static series compensator |
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| CN103078320B (en) | 2014-12-31 |
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