CN110571823A - Power transmission line compensation device - Google Patents
Power transmission line compensation device Download PDFInfo
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- CN110571823A CN110571823A CN201910809567.6A CN201910809567A CN110571823A CN 110571823 A CN110571823 A CN 110571823A CN 201910809567 A CN201910809567 A CN 201910809567A CN 110571823 A CN110571823 A CN 110571823A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims description 16
- 150000004706 metal oxides Chemical class 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 15
- 238000002955 isolation Methods 0.000 description 8
- 239000008186 active pharmaceutical agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
the invention discloses a compensation device for a power transmission line, which comprises: the series compensation unit is used for series compensation and is connected in series in the power transmission line, so that the electrical distance of the transmission channel can be shortened, and the power quality is improved; and the parallel compensation unit is used for parallel compensation, is connected with the load side in parallel, can realize reactive compensation in a line, and can play a role in filtering and improve the quality of electric energy.
Description
Technical Field
The invention relates to the technical field of power transmission systems, in particular to a compensation device for a power transmission line.
background
With the rapid development of social economy, a 110kV power transmission system has the advantages of short construction period, low construction cost and the like, and becomes a main solution for transmitting power to large-load users such as petrifaction users, mining users, metallurgy users and the like. Due to the fact that the geographical position of part of heavy-load users is remote and far away from the main network, a typical long-distance and large-capacity 110kV power transmission structure is formed. In a 110kV long-distance transmission system, an excessively large electrical distance, a voltage deviation, a line loss, a problem of voltage quality on a load side, and the like are bottleneck factors affecting transmission capacity, and particularly, the problem is more prominent in a case where a load power factor is low or fluctuation is frequent.
Disclosure of Invention
In view of this, the present invention provides a power transmission line compensation apparatus, which can improve the transmission capability of a power transmission system and improve the power quality.
Based on the above object, the present invention provides a compensation device for a power transmission line, comprising:
The series compensation unit is used for series compensation and is connected in series in the power transmission line;
And the parallel compensation unit is used for parallel compensation and is connected with the load side in parallel.
Optionally, the series compensation unit includes a bypass isolation switch, two ground switches, a series capacitor bank, two series isolation switches, a metal oxide voltage limiter, a damping device, and a bypass circuit breaker, the bypass circuit breaker is connected in series with the damping device to form a first branch, the two ground switches are connected in series to form a second branch, the first branch, the second branch, the metal oxide voltage limiter, and the series capacitor bank are connected in parallel, one end of the second branch is connected with one end of the first series isolation switch, the other end of the second branch is connected with one end of the second series isolation switch, the other end of the first series isolation switch is connected with one end of the bypass isolation switch, and the other end of the second series isolation switch is connected with the other end of the bypass isolation switch.
Optionally, the metal oxide voltage limiter has a structure that: the metal oxide voltage limiter is formed by stacking 6 QE36 type valves to form 1 string, connecting 4 strings in parallel and packaging an insulating envelope to form 1 column, and connecting 3 columns in parallel.
Optionally, the parallel compensation unit is formed by connecting a thyristor controlled reactor branch and a filter branch in parallel.
Optionally, the thyristor controlled reactor branch comprises a thyristor valve and a valve controlled reactor, the thyristor valve and the valve controlled reactor are connected in series, and the thyristor controlled reactor branch is in a delta connection; the filtering branch circuit is formed by connecting a compensation capacitor and a filtering inductor in series.
Optionally, the filtering branches respectively filter 11 th, 13 th and 23 th harmonics.
From the above, the power transmission line compensation device provided by the invention comprises the series compensation unit and the parallel compensation unit, wherein the series compensation unit is connected in series in the power transmission line, the electrical distance of a transmission channel can be shortened, the power quality is improved, the parallel compensation unit is connected with a load side in parallel, the reactive compensation in the line can be realized, and meanwhile, the filtering function and the power quality are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power transmission line according to the present embodiment;
FIG. 2 is a graph of a harmonic current spectrum of the power transmission line of FIG. 1;
Fig. 3 is a schematic diagram of a power transmission line compensation device according to an embodiment of the invention;
FIG. 4 is a schematic circuit diagram of a series compensation unit according to an embodiment of the present invention;
FIG. 5 is a schematic view of the current-voltage characteristic of a metal oxide voltage limiter MOV according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a circuit of a merging and complementing unit according to an embodiment of the present invention;
FIG. 7A is a bus bar B of an embodiment of the present invention1A voltage versus load diagram of (a);
FIG. 7B is a bus bar B according to an embodiment of the present invention2A voltage versus load diagram of (a);
Fig. 8 is a schematic diagram of a frequency impedance characteristic curve according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
it should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
Fig. 1 is a schematic diagram of the power transmission line of the embodiment. As shown in the figure, in the 110kV long-distance power transmission system of this embodiment, the distance from the main network to the load is 270 km, the main network and the load are connected through a 110kV voltage class 2XLGJ-300 double split conductor, B0T1 and T2 are transformers. The parameters of the load side step-down transformer are shown in table 1, and two transformers of the same type are operated in parallel in a distant view annual network.
TABLE 1
the problems of voltage deviation, reactive power balance, line loss and the like of the power transmission line shown in fig. 1 are very prominent, especially the voltage deviation problem becomes a bottleneck factor of the transmission capacity of the power grid, and table 2 shows that a bus B changes along with the load power factor1、B2Voltage U of1、U2Varying conditions, power factor dependent on loadThe voltage level on the load side is rapidly reduced to be below the qualified level of 0.9, and under the condition that the load of the distant view annual line network is increased, the electric energy transmission capacity is restricted.
TABLE 2
as shown in fig. 2, a user on the load side of the power transmission line shown in fig. 1 is a mining load, and has the characteristics of volatility, intermittency, high harmonic content and the like, the characteristic harmonics are mainly harmonics of 11, 13, 23 and 25 times, the harmonic content is greatly changed along with the fluctuation of the load, and if a filtering measure is not taken, the harmonic exceeds the standard, and the safety and the economy of load operation are affected.
Fig. 3 is a schematic diagram of a power transmission line compensation device according to an embodiment of the present invention. As shown in fig. 3, the power transmission line compensation apparatus of the present embodiment includes a series compensation unit and a parallel compensation unit.
Fig. 4 is a schematic circuit diagram of a series compensation unit according to an embodiment of the present invention. As shown in fig. 3 and 4, the series compensation unit is connected in series in the transmission line for series compensation, so that the electrical distance of the transmission channel can be shortened, and the power quality can be improved.
the series compensation unit comprises a bypass isolating switch BS, two grounding switches ES, a series capacitor bank C, two series isolating switches DS, a metal oxide voltage limiter MOV, a damping device D and a bypass breaker BCB, the bypass breaker BCB is connected with the damping device D in series to form a first branch, the two grounding switches ES are connected in series to form a second branch, the first branch, the second branch, the metal oxide voltage limiter MOV and the series capacitor bank C are connected in parallel, one end of the second branch is connected with one end of the first series isolating switch DS, the other end of the second branch is connected with one end of the second series isolating switch DS, the other end of the first series isolating switch DS is connected with one end of the bypass isolating switch BS, and the other end of the second series isolating switch DS is connected with the other end of the bypass isolating switch BS.
the basic circuit parameters of the series compensation unit of this embodiment are shown in table 3, the series compensation unit of this embodiment does not have a spark gap branch, and as an important element of overvoltage protection, a metal oxide voltage limiter MOV (metal oxide varistor) is designed based on a valve plate of QE36 type, and adopts a 6 series-12 parallel scheme, specifically: 6 QE36 type valve plates are stacked to form 1 string, 4 strings are connected in parallel and packaged to form 1 column in an insulating envelope, the whole device is formed by connecting 3 columns in parallel to form a 6 x 12 valve plate wiring structure, so that the MOV of the metal oxide voltage limiter can reach 8.25MJ (heat value unit), has a certain capacity margin and has certain adaptability to external faults.
TABLE 3
Fig. 5 is a schematic view of the current-voltage characteristic curve of the metal oxide voltage limiter MOV according to the embodiment of the present invention. As shown in the figure, the volt-ampere characteristic of the metal oxide voltage limiter MOV of the present embodiment is that when the voltage is lower than the rated voltage, the voltage shows a high resistance characteristic, and only the leakage current passes through; when the voltage is higher than the rated voltage, a low resistance characteristic is presented, a fault current is shunted, and the capacitor bank is protected.
Fig. 6 is a schematic circuit diagram of a merging and complementing unit according to an embodiment of the present invention. As shown in fig. 3 and 6, in the present embodiment, the merging and supplementing unit is disposed in parallel with the load, and the merging and supplementing unit employs a TCR + FC type SVC (static var compensator) circuit.
The SVC circuit is composed of a thyristor controlled reactor TCR branch and a filtering FC branch, and the TCR branch and the FC branch are connected in parallel. The thyristor control reactor TCR branch circuit comprises a thyristor valve and a valve control reactor, the thyristor valve and the valve control reactor are connected in series, and the three-phase TCR branch circuits are connected in a triangular connection way; the FC branch circuit is formed by connecting a compensation capacitor and a filter inductor in series, the compensation capacitor and the filter inductor present capacitance characteristics under power frequency through parameter matching, and present low impedance characteristics to specific times of harmonic waves, so that a filtering effect is achieved, for example, the FC branch circuit is used for filtering 11 times of harmonic waves, 13 times of harmonic waves and 23 times of harmonic waves.
The capacity parameters of the parallel compensation unit are shown in table 4, and the TCR branch circuit and the FC branch circuit present capacitance characteristics under power frequency through parameter matching, so that reactive compensation in a circuit can be realized, a filtering effect can be achieved, and the power quality can be improved.
TABLE 4
FIG. 7A is a bus bar B of an embodiment of the present invention1Fig. 7B is a schematic diagram of the voltage variation with load of the embodiment of the present invention2Is a graph of voltage versus load. As shown, U10、U20The line graphs are respectively the line graphs of the voltage value of the bus B1 changing with the load before and after the compensation device of the power transmission line is used, when the compensation device of the embodiment is not implemented, the 110kV power transmission line distance is too long, and the voltage of the 110kV side is lower than the allowable lower limit when the power factor is lower than 0.925; the lower limit of the voltage of the 10kV side is more severe, the voltage level is lower under the same power factor, the lower limit of the standard requirement is only barely reached in a narrow range of the power factor close to 1.0, and the transmission capacity of the 110kV transmission line is severely restricted; as shown in the figure, along with the reduction of the power factor, the capacity-increasing compensation device of the embodiment can automatically adjust the output reactive power, support the bus voltage, maintain the voltage at a qualified level, remarkably optimize and improve the voltage level of the power transmission line, has good self-adaptive characteristic and robustness when the power factor changes, and can meet the load requirement.
Fig. 8 is a schematic diagram of a frequency impedance characteristic curve according to an embodiment of the invention. As shown in the figure, the present embodiment employs the parallel compensation unit, which can provide low-impedance absorption circuits for harmonics of 11, 13 and 23 orders at the same time, and has good filtering capability for harmonics of 23 orders or more.
Table 5 shows the effect of the parallel compensation unit of this embodiment on suppressing odd harmonics (even harmonics are non-characteristic frequency harmonics, and the content is extremely low). Wherein H is the harmonic order, IH1The percentage of the H1 subharmonic current injected into the system without a filter loop to the subharmonic current, IH2The H1 subharmonic current injected into the system after the filter loop is configured is a percentage of the subharmonic current. It can be seen that the parallel compensation unit of the present embodiment slightly amplifies the harmonic currents of 5 th, 9 th and 17 th orders, but the absolute content of the harmonic is very small, and the harmonic is not over-standard; for other subharmonics, the method has good inhibition effect, can reduce the 11 th harmonic from 22.19% to 0.93%, can reduce the 13 th harmonic from 23.81% to 0.46%, obviously improves the electric energy quality, and is beneficial to the safe and economic operation of loads.
TABLE 5
The apparatus of the foregoing embodiment is used to implement the corresponding method in the foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures, such as Dynamic RAM (DRAM), may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A transmission line compensation apparatus, comprising:
The series compensation unit is used for series compensation and is connected in series in the power transmission line;
And the parallel compensation unit is used for parallel compensation and is connected with the load side in parallel.
2. The apparatus of claim 1,
the series compensation unit comprises a bypass isolating switch, two grounding switches, a series capacitor bank, two series isolating switches, a metal oxide voltage limiter, a damping device and a bypass circuit breaker, wherein the bypass circuit breaker is connected with the damping device in series to form a first branch circuit, the two grounding switches are connected in series to form a second branch circuit, the first branch circuit, the second branch circuit, the metal oxide voltage limiter and the series capacitor bank are connected in parallel, one end of the second branch circuit is connected with one end of the first series isolating switch, the other end of the second branch circuit is connected with one end of the second series isolating switch, the other end of the first series isolating switch is connected with one end of the bypass isolating switch, and the other end of the second series isolating switch is connected with the other end of the bypass isolating switch.
3. The device of claim 2, wherein the metal oxide voltage limiter is structured to: the metal oxide voltage limiter is formed by stacking 6 QE36 type valves to form 1 string, connecting 4 strings in parallel and packaging an insulating envelope to form 1 column, and connecting 3 columns in parallel.
4. the apparatus of claim 3, wherein the combining and supplementing unit is formed by connecting a thyristor-controlled reactor branch and a filter branch in parallel.
5. the apparatus of claim 4, wherein the thyristor-controlled reactor branch comprises a thyristor valve and a valve-controlled reactor, the thyristor valve and the valve-controlled reactor being connected in series, the thyristor-controlled reactor branch being delta-connected; the filtering branch circuit is formed by connecting a compensation capacitor and a filtering inductor in series.
6. the apparatus of claim 5, wherein the filtering branches filter 11 th, 13 th and 23 rd harmonics respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809567.6A CN110571823A (en) | 2019-08-29 | 2019-08-29 | Power transmission line compensation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910809567.6A CN110571823A (en) | 2019-08-29 | 2019-08-29 | Power transmission line compensation device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937269U (en) * | 2010-08-24 | 2011-08-17 | 国网南自控股（杭州）有限公司 | All-weather static-type dynamic reactive-power automatic-compensating device |
| CN106208010A (en) * | 2016-09-27 | 2016-12-07 | 上海北堃电力科技有限公司 | A kind of capacitor protection equipment and series compensation device |
| WO2017088510A1 (en) * | 2015-11-24 | 2017-06-01 | 中国电力科学研究院 | Determination method for series compensation device having adjustable rated parameter |
| CN210838960U (en) * | 2019-08-29 | 2020-06-23 | 国网山东省电力公司烟台供电公司 | Capacity-increasing compensation device for long-distance power transmission system |
-
2019
- 2019-08-29 CN CN201910809567.6A patent/CN110571823A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937269U (en) * | 2010-08-24 | 2011-08-17 | 国网南自控股（杭州）有限公司 | All-weather static-type dynamic reactive-power automatic-compensating device |
| WO2017088510A1 (en) * | 2015-11-24 | 2017-06-01 | 中国电力科学研究院 | Determination method for series compensation device having adjustable rated parameter |
| CN106208010A (en) * | 2016-09-27 | 2016-12-07 | 上海北堃电力科技有限公司 | A kind of capacitor protection equipment and series compensation device |
| CN210838960U (en) * | 2019-08-29 | 2020-06-23 | 国网山东省电力公司烟台供电公司 | Capacity-increasing compensation device for long-distance power transmission system |
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| Title |
|---|
| 吴琦主编: "安徽电力工业技术论坛", vol. 7, 30 September 2006, 合肥：中国科学技术大学出版社, pages: 110 - 114 * |
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| 陈葛松等: "500kV串补站过电压保护研究", 电网技术, vol. 25, no. 2, 28 February 2001 (2001-02-28), pages 21 - 24 * |
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