CN106018999A - Energy efficiency measuring method for flexible DC transmission system - Google Patents
Energy efficiency measuring method for flexible DC transmission system Download PDFInfo
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- CN106018999A CN106018999A CN201610317391.9A CN201610317391A CN106018999A CN 106018999 A CN106018999 A CN 106018999A CN 201610317391 A CN201610317391 A CN 201610317391A CN 106018999 A CN106018999 A CN 106018999A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses an energy efficiency measuring method for a flexible DC transmission system. For each converter station in a flexible DC transmission system, the method comprises the following steps: determining N measuring points, wherein N is a positive integer not less than 2; installing an electric energy measuring device at each of the N measuring points, wherein each electric energy measuring device includes a current transformer used for collecting the current of the corresponding measuring point, a voltage transformer used for collecting the voltage of the corresponding measuring point and an electric energy meter used for integrating the product of current and voltage to get the energy of the corresponding measuring point; and calculating the energy conversion efficiency of flexible DC transmission equipment between any two adjacent measuring points among the N measuring points according to the energy calculated by the electric energy meters at the two adjacent measuring points. According to the method, the energy conversion efficiency of flexible DC transmission equipment between any two adjacent measuring points can be calculated according to the energy of the two adjacent measuring points, and a theoretical basis is provided for electrical equipment and system energy efficiency assessment.
Description
Technical field
The present invention relates to Technology of HVDC based Voltage Source Converter field, particularly relate to a kind of energy for flexible direct current power transmission system
Effect metering method.
Background technology
After the nineties in last century, the voltage source converter high voltage dc transmission technology based on wholly-controled device is subject to
The attention of industry has also obtained quick development, is the commanding elevation of world today's Power Electronic Technique application, is also intelligence
One of energy electrical network key technology.Compared with conventional AC transmission of electricity and D.C. high voltage transmission, flexible DC power transmission has a lot
Advantage.
But transmitting electricity compared to Traditional DC, the loss of flexible DC power transmission is relatively big, at present, the list station of Traditional DC transmission of electricity is damaged
Consumption is less than 0.8%, and the single current conversion station of two level and three level flexible DC power transmissions is lost about 2%, and many level are soft
Property direct current transportation single current conversion station loss be about 1.5%, and flexible DC power transmission as new electric energy change, conveying mould
Formula, present stage, its research focused mostly at aspects such as system Construction, reliability and operation maintenance, at flexible DC power transmission with application
The research such as the flexible DC power transmission plant capacity conversion efficiency under energy conversion efficiency particularly actual working state and application neck
Territory is still in blank.
Therefore, how providing a kind of efficiency metering method for flexible direct current power transmission system is those skilled in the art's mesh
The front problem needing to solve.
Summary of the invention
It is an object of the invention to provide a kind of efficiency metering method for flexible direct current power transmission system, by straight in flexibility
The current conversion station of stream transmission system arranges multiple stoichiometric point, then electric power meter is set at stoichiometric point, by electric energy meter
Amount device obtains the energy of each stoichiometric point, thus just can obtain being positioned at this phase by the energy of two stoichiometric points of arbitrary neighborhood
The energy conversion efficiency of the flexible DC power transmission equipment between adjacent stoichiometric point, comments for carrying out electrical equipment and system energy efficiency
Estimate and provide theoretical basis, be the basic assurance that efficiency detection platform is set up and standards system is promoted from now on, soft for improving from now on
Property the DC transmission system change of current and transmission facility technological level, system operation mode provide technical support.
For solving above-mentioned technical problem, the invention provides a kind of efficiency metering side for flexible direct current power transmission system
Method, for each current conversion station in described flexible direct current power transmission system, the method includes:
Step S101: determine N number of stoichiometric point, N is the positive integer not less than 2；
Step S102: be respectively mounted electric power meter at N number of described stoichiometric point, wherein, described electric power meter bag
Include the current transformer of the electric current for gathering corresponding stoichiometric point, for gathering the mutual induction of voltage of the voltage of described corresponding stoichiometric point
Device and the product to described electric current and described voltage are integrated obtaining the electric energy meter of the energy of described corresponding stoichiometric point；
Step S103: the energy balane obtained according to the electric energy meter of two stoichiometric points of arbitrary neighborhood in N number of described stoichiometric point
The energy conversion efficiency of the flexible DC power transmission equipment between described adjacent two stoichiometric points.
Preferably, described stoichiometric point includes:
It is positioned at the input of the tietransformer in described current conversion station, stands with becoming end, brachium pontis reactor front end and cable
Input.
Preferably, the method also includes:
The energy obtained according to the electric energy meter of the input of described tietransformer and the electric energy of described cable output end
The energy that table obtains obtains the energy conversion efficiency of described flexible direct current power transmission system.
Preferably, described stoichiometric point also includes cable output end.
Preferably, described current transformer is 0.2S level current transformer.
Preferably, described voltage transformer is 0.2 step voltage transformer.
Preferably, described electric energy meter is the electric energy meter that class of accuracy is 0.2S level of gaining merit.
Preferably, described electric energy meter is the electric energy meter with positive and negative bidirectional measuring function.
Preferably, also include between step S102 and step S103:
Adjust the concordance of the electric power meter of two stoichiometric points of arbitrary neighborhood, make described concordance less than 0.05%.
The invention provides a kind of efficiency metering method for flexible direct current power transmission system, by flexible DC power transmission
The current conversion station of system arranges multiple stoichiometric point, then electric power meter is set at stoichiometric point, passes through electric power meter
Obtain the energy of each stoichiometric point, thus just can obtain being positioned at this adjacent metering by the energy of two stoichiometric points of arbitrary neighborhood
The energy conversion efficiency of the flexible DC power transmission equipment between point, provides for carrying out electrical equipment and system energy efficiency evaluation
Theoretical basis, is the basic assurance that efficiency detection platform is set up and standards system is promoted from now on, for improving flexible direct current from now on
The transmission system change of current and transmission facility technological level, system operation mode provide technical support.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment
The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtains according to these accompanying drawings
Obtain other accompanying drawing.
The flow process of the process of a kind of efficiency metering method for flexible direct current power transmission system that Fig. 1 provides for the present invention
Figure；
The topology diagram of current conversion station in a kind of both-end flexible direct current power transmission system that Fig. 2 provides for the present invention；
The topology diagram of current conversion station in a kind of Multi-end flexible direct current transmission system that Fig. 3 provides for the present invention.
Detailed description of the invention
The core of the present invention is to provide a kind of efficiency metering method for flexible direct current power transmission system, by straight in flexibility
The current conversion station of stream transmission system arranges multiple stoichiometric point, then electric power meter is set at stoichiometric point, by electric energy meter
Amount device obtains the energy of each stoichiometric point, thus just can obtain being positioned at this phase by the energy of two stoichiometric points of arbitrary neighborhood
The energy conversion efficiency of the flexible DC power transmission equipment between adjacent stoichiometric point, comments for carrying out electrical equipment and system energy efficiency
Estimate and provide theoretical basis, be the basic assurance that efficiency detection platform is set up and standards system is promoted from now on, soft for improving from now on
Property the DC transmission system change of current and transmission facility technological level, system operation mode provide technical support.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Refer to the mistake of a kind of efficiency metering method for flexible direct current power transmission system that Fig. 1, Fig. 1 provide for the present invention
The flow chart of journey；
For each current conversion station in flexible direct current power transmission system, the method includes:
Step S101: determine N number of stoichiometric point, N is the positive integer not less than 2；
It is understood that according to the Energy Efficiency Analysis to flexible direct current power transmission system, determine the main energy consumption equipment of system,
Take economy, harmonic wave factor and the impact of actual motion state into consideration, so that it is determined that the configuration of stoichiometric point.
Specifically, refer to Fig. 2 and Fig. 3, wherein, a kind of both-end flexible direct current power transmission system that Fig. 2 provides for the present invention
The topology diagram of middle current conversion station, the topology of current conversion station in a kind of Multi-end flexible direct current transmission system that Fig. 3 provides for the present invention
Structure chart.
According to the analysis to exemplary flexible DC transmission system, it is calculated in system the proportion of goods damageds of main energy consumption equipment,
Result is as shown in table 1.As shown in Table 1, in flexible direct current power transmission system, the ratio shared by inverter loss is maximum
, next to that the loss of tietransformer.This is one of the theoretical basis that flexible direct current power transmission system stoichiometric point selects.
The typical loss of each element in table 1 flexible direct current power transmission system
The concrete energy consumption of efficiency metering mainly each energy consumption equipment clear and definite of flexible direct current power transmission system, mainly includes connection
Knot transformator, brachium pontis reactor, inverter, smoothing reactor and cable etc., as long as at the input of energy consumption equipment and outfan
Install the purpose that corresponding electric power meter can be achieved with measuring this energy efficiency of equipment additional.Carry out flexible direct current power transmission system efficiency
The factor selecting the following several respects of main consideration of stoichiometric point:
1) economy
Difference between input power and output can provide the required active loss measuring energy consumption equipment.From reality
Engineering is set out, and input and the outfan of each main element energy in flexible direct current power transmission system install electric energy metrical additional
The efficiency Econometric that device carries out relevant device and system is relatively costly, on the one hand according to current conversion station each capital equipment loss meter
Calculation method and existing flexible DC power transmission engineering active loss analysis understand: in flexible direct current converter station is lost, inverter damages
Consumption accounts for major part, as shown in table 1, can be normally reached more than 50%.If cannot be at all energy consumption equipment input and output two ends
Should mainly consider when installing metering device additional bigger related elements is lost, electric power meter is arranged on the element that loss is bigger
Both sides, then relatively easily can measure the loss of this element the most accurately, be calculated without by the later stage,
Thus can improve the accuracy of efficiency metering.On the other hand, can be according to the characteristic of related elements, metering point data of being correlated with
The methods such as collection and mathematical analysis, find the element that the method for operation is more fixing, loss numerical value is relatively small, such as earthing reactance
Device, brachium pontis reactor, smoothing reactor etc., it is thus achieved that more accurate this element loss size or proportion.It addition, metering dress
Put the condition of installation, the difficulty etc. of construction is also to affect the Consideration that stoichiometric point selects.
2) harmonic effects
The selection another one of the stoichiometric point of flexible direct current power transmission system considers that point is for system harmonics characteristic.Flexible direct current is defeated
The operation that electricity system typically uses level approximatioss to carry out inverter controls.
Along with the raising of number of levels, each harmonic content substantially reduces, when N is more than time to a certain degree, and each time feature is humorous
Ripple content all has dropped down to low-down harmonics level.The each harmonic content of 21 level staircase waveforms is substantially below 1.2%；31
The each harmonic content of level staircase waveform is substantially below 0.7%；The each harmonic content of 41 level staircase waveforms substantially exists
Less than 0.5%；The each harmonic content of 51 level staircase waveforms is substantially below 0.4%.But, N is excessive causes system to enter
Overmodulation, THD (Total Harmonic Distortion, total harmonic distortion) value can significantly rise.Permissible from harmonic characterisitic
Find out, 4 THD content after MMC (Modular Multilevel Converter, modularization multi-level converter) controls
The least, 7 after smoothing reactor, harmonic wave is the least, therefore, 4 and 7 two accurately can measure as stoichiometric point.
Outside divided by upper 2, other Consideration also includes:
1) due to during normal operation start resistance be to be switched on and off bypass, stoichiometric point 3 and stoichiometric point 4 can be considered as same metering
Point, it is not necessary to repeat to arrange.The continuous data of stoichiometric point 1,2,4 can obtain connecting the loss of transformator；If 3 is stoichiometric point, then
It is considered as the loss of earthing reactor.
2) after stoichiometric point 5 is positioned at brachium pontis reactor, if arrange stoichiometric point at this, then need at A, B, C three-phase totally 6 brachium pontis
On install the electric power meters such as current transformer and voltage transformer additional, relatively costly, metering device relative difficulty, and this are installed
Place's harmonic content is high, is difficult to accurately measure.Being obtained by table 1, brachium pontis reactor loss accounting is the highest simultaneously, the most accurately calculates, because of
This can select not arrange at 5 stoichiometric point；
3) being obtained by table 1 equally, smoothing reactor loss accounts for smaller and the most accurately calculates, therefore at stoichiometric point 6 and meter
Amount point 7 selects a little to install additional electric power meter.Because stoichiometric point 7 harmonic content is little, stoichiometric point 7 is therefore selected to carry out meter
Amount；
4) stoichiometric point 7 in stoichiometric point 8 really offside current conversion station.
According to above-mentioned analysis, for the current conversion station of both-end flexible direct current power transmission system, 1,2,4,7 can be selected as metering
Point.For the current conversion station of Multi-end flexible direct current transmission system, can select 1,2,4,7,8,9 ... M is as stoichiometric point, wherein, M is
Positive integer as many as 9.
That is, as preferably, stoichiometric point includes:
The input of the tietransformer being positioned in current conversion station, use of standing become end, brachium pontis reactor front end and cable input
End.
If it addition, further contemplate the energy loss of cable, as preferably, stoichiometric point also includes cable output end.
In the application, can be by smoothing reactor, brachium pontis reactor and inverter these three element be counted respectively
Learn modeling, the respective energy loss of analytical calculation theoretically, by real data and the combination of emulation data, determine flat ripple electricity
The respective loss of anti-device, brachium pontis reactor and inverter.
It should be noted that above-mentioned introduction is that integrated economics, harmonic wave factor and actual operating state angularly go choosing
Selecting stoichiometric point, certain present invention can also go to select stoichiometric point according to practical situation, and the present invention is not particularly limited at this.
Step S102: be respectively mounted electric power meter at N number of stoichiometric point, wherein, electric power meter includes for adopting
Set pair answers the current transformer of the electric current of stoichiometric point, for gathering the voltage transformer of the voltage of corresponding stoichiometric point and to electric current
It is integrated obtaining the electric energy meter of the energy of corresponding stoichiometric point with the product of voltage；
As preferably, current transformer is 0.2S level current transformer.
As preferably, voltage transformer is 0.2 step voltage transformer.
As preferably, electric energy meter is the electric energy meter that class of accuracy is 0.2S level of gaining merit.
It is understood that flexible direct current power transmission system can carry out the transmitted in both directions of electric energy, accordingly, as preferably,
Here electric energy meter can be the electric energy meter with positive and negative bidirectional measuring function.
Certainly, current transformer, voltage transformer and electric energy meter here all can also use other class of accuracies,
The present invention is not particularly limited at this, determines according to practical situation.
It is understood that after determining stoichiometric point, be respectively mounted at each stoichiometric point current transformer, voltage transformer with
And electric energy meter, electric energy meter receives the electric current that collects of current transformer and voltage transformer collects voltage also amasss accordingly
Point, obtain the energy of corresponding stoichiometric point.
Specifically, for both-end or the current conversion station of Multi-end flexible direct current transmission system, it is respectively mounted electricity 1,2,4 and at 7
Current transformer, voltage transformer and electric energy meter.
It addition, for Multi-end flexible direct current transmission system, according to the principle of power conservation, the damage of whole system can be obtained
Consumption.Incorporation engineering is actual, when DC side has a plurality of direct current outlet, it is considered to the loss of cable, all pacifies at every cable output end
Dress current transformer, installs voltage transformer on dc bus.
As preferably, also include between step S102 and step S103:
Adjust the concordance of the electric power meter of two stoichiometric points of arbitrary neighborhood, make concordance be less than 0.05%.
It is understood that in order to improve accuracy, need exist for the dress of the electric energy metrical to two stoichiometric points of arbitrary neighborhood
The concordance put is adjusted, and makes concordance be less than 0.05%.
Consideration analysis according to economy and harmonic effects factor, in FIG 1,2,4,7 stoichiometric point is set, and leads to
Cross 1,2,4,7 meterings obtain electric energy.Meanwhile, according to the electric energy loss error of tietransformer, brachium pontis reactor, inverter
Loss with electric energy total losses error, the electric energy loss error of cable and the whole flexible direct current power transmission system of smoothing reactor misses
Difference requirement, available efficiency measurement instrument accuracy and error consistency requirement.
The electric energy loss Δ P of tietransformerBecome:
ΔPBecome=P1-P2-P4.........................(1)
Then due to the error of electric power meter at 1,2,4 stoichiometric points so that Δ PBecomeThe calculating error produced is equal to:
Δ(ΔPBecome)=Δ P1-ΔP2-ΔP4.........................(2)
In formula: Δ (Δ PBecome) it is Δ PBecomeError；ΔP1Error for the electric power meter at stoichiometric point 1；ΔP2For meter
The error of the electric power meter at amount point 2；ΔP4Error for the electric power meter at stoichiometric point 4.
General power is represented, then with P
According to the analysis of table 1, the electric energy loss Δ P of tietransformerBecomeAccount for the 0.24% of general power P, press Δ P hereinBecome
≈ 0.3%P.And have P1≈P、P4≈ P, P2Much smaller than P, press P herein2≈ 1%P calculates, then:
The then electric energy loss Δ P of tietransformerBecomeRelative error is calculated by following equation:
Can be analyzed by formula (5) and obtain:
1) error of electric power meter at stoichiometric point 2, to electric energy loss Δ PBecomeThe impact of relative error little；
2) at stoichiometric point 1 and stoichiometric point 4, when the symbol of electric power meter error is identical, electric energy loss Δ PBecomeRelative
Error is less；
3) at stoichiometric point 1 and stoichiometric point 4, when the symbol of measurement instrument error is contrary, tietransformer loss Δ PBecomePhase
Bigger to error.
Use Y1,4=(Δ P1/P1)-(ΔP4/P4) represent the concordance of electric power meter at stoichiometric point 1 and stoichiometric point 4,
Assume that the electric power meter at stoichiometric point 2 is 0.2 grade, it is considered to worst situation, electric energy loss Δ PBecomeRelative error with
Y1,4Relation as shown in table 2.
Table 2 Δ PBecomeRelative error and Y1,4Relation table
| Y1,4 | 0.4% | 0.2% | 0.1% | 0.05% |
| ΔPBecomeRelative error | 133% | 66% | 33% | 16% |
Brachium pontis reactor, inverter and the electric energy total losses Δ P of smoothing reactor is calculated by formula (6)Always:
ΔPAlways=Δ PBrachium pontis reactor+ΔPConverter valve+ΔPSmoothing reactor
=(P4-P5)+(P5-P6)+(P6-P7).........................(6)
=P4-P7
Then due to the error of measurement instrument at 4,7 stoichiometric points so that Δ PAlwaysThe calculating error produced is equal to:
Δ(ΔAlways)=Δ P4-ΔP7.........................(7)
In formula: Δ (ΔAlways) it is Δ PAlwaysError；ΔP7For the error of electric power meter at stoichiometric point 7.
Analyze according to table one, the electric energy total losses Δ P of brachium pontis reactor, inverter and smoothing reactorAlwaysAccount for general power P
0.843%, press Δ P hereinAlways≈ 0.85%P.And have P4≈P、P7≈ P, then:
The then electric energy total losses Δ P of brachium pontis reactor, inverter and smoothing reactorAlwaysRelative error is based on following equation
Calculate:
Use Y4,7=(Δ P4/P4)-(ΔP7/P7) represent the concordance of electric power meter at stoichiometric point 4 and stoichiometric point 7,
Electric energy loss Δ PAlwaysRelative error and Y4,7Relation as shown in table 3.
Table 3 Δ PAlwaysRelative error and Y4,7Relation
| Y4,7 | 0.4% | 0.2% | 0.1% | 0.05% |
| ΔPAlwaysRelative error | 47% | 24% | 12% | 6% |
The electric energy loss Δ P of cable is calculated by formula (10)Cable:
ΔPCable=P7-P8.........................(10)
Then due to the error of measurement instrument at 7,8 stoichiometric points so that Δ PCableThe calculating error produced is equal to:
Δ(ΔPCable)=Δ P7-ΔP8.........................(11)
In formula: Δ (Δ PCable) it is Δ PCableError；ΔP8For the error of electric power meter at stoichiometric point 8.
Analyze according to table one, the electric energy loss Δ P of the long cable of 50kmCableAccount for the 0.15% of general power P, press Δ P hereinCable
≈ 0.2%P.And have P7≈P、P8≈ P, then:
The then electric energy loss Δ P of the long cable of 50kmCableRelative error is calculated by following equation:
Use Y7,8=(Δ P7/P7)-(ΔP8/P8) represent the concordance of electric power meter at stoichiometric point 7 and stoichiometric point 8,
The relative error of electric energy loss △ P cable and Y7,8Relation as shown in table 4.
Table 4 Δ PCableRelative error and Y7,8Relation
Then the efficiency error in dipping of flexible direct current power transmission system is represented by:
By Δ PBecome≈ 0.3%P, Δ PAlways≈ 0.85%P, Δ PCable≈ 0.2%P, and P1≈P、P8≈ P, P2≈ 1%P can obtain,
Use Y1,8=(Δ P1/P1)-(ΔP8/P8) represent the concordance of electric power meter at stoichiometric point 1 and stoichiometric point 8,
Assume that the electric power meter at stoichiometric point 2 is 0.2 grade, then the error at stoichiometric point 2 is negligible not to the error of whole system
Meter, it is considered to worst situation, the relative error of electric energy loss △ P system and Y7,8Relation as shown in table 5.
Table 5 Δ PSystemRelative error and Y1,8Relation
| Y7,8 | 0.4% | 0.2% | 0.1% | 0.05% |
| ΔPSystemRelative error | 30% | 15% | 7% | 4% |
Electric energy metrical is different with efficiency metering starting point angle, the metering dress that electric energy metrical accuracy and stoichiometric point are configured
The class of accuracy put is directly proportional, and the class of accuracy of metering device is the highest, and it is the most accurate to measure；Efficiency is measured except metering device
Class of accuracy outside, it should also be taken into account that the error consistency of the configured metering device of the stoichiometric point that is associated.Efficiency stoichiometric point meter
Device class of accuracy is the highest, error consistency degree is the highest for amount, and efficiency metering relative error is the least.
Step S103: the energy balane obtained according to the electric energy meter of two stoichiometric points of arbitrary neighborhood in N number of stoichiometric point is adjacent
The energy conversion efficiency of the flexible DC power transmission equipment between two stoichiometric points.
It is understood that for certain flexible DC power transmission equipment of current conversion station, the energy of this flexible DC power transmission equipment
Measure at the stoichiometric point of the energy at the stoichiometric point of the outfan that conversion efficiency is this flexible DC power transmission equipment and input
The ratio of energy.
It addition, as it is shown on figure 3, Multi-end flexible direct current transmission system should be at stoichiometric point 1,2,4,7,8,9 ... metering is installed at M
Device.According to law of conservation of energy, connection transformer loss is Δ PTietransformer=P1-P2-P4, inverter and corresponding reactor damage
Consumption is Δ PInverter=P7-P4, whole current conversion station energy consumption is Δ PCurrent conversion station=P1-(P8+P9+...+PM)。
As preferably, the method also includes:
The energy obtained according to the electric energy meter of the input of tietransformer and the electric energy meter of cable output end obtain
Energy obtains the energy conversion efficiency of flexible direct current power transmission system.
It is understood that by Δ PCurrent conversion station=P1-(P8+P9+...+PM) obtain the loss of this current conversion station, calculating flexibility
During the energy conversion efficiency of DC transmission system, only the method need to be used to be calculated in flexible direct current power transmission system each change of current
The loss stood, i.e. can get the energy conversion efficiency of flexible direct current power transmission system by the loss of general power He each current conversion station.
The invention provides a kind of efficiency metering method for flexible direct current power transmission system, by flexible DC power transmission
The current conversion station of system arranges multiple stoichiometric point, then electric power meter is set at stoichiometric point, passes through electric power meter
Obtain the energy of each stoichiometric point, thus just can obtain being positioned at this adjacent metering by the energy of two stoichiometric points of arbitrary neighborhood
The energy conversion efficiency of the flexible DC power transmission equipment between point, provides for carrying out electrical equipment and system energy efficiency evaluation
Theoretical basis, is the basic assurance that efficiency detection platform is set up and standards system is promoted from now on, for improving flexible direct current from now on
The transmission system change of current and transmission facility technological level, system operation mode provide technical support.
It addition, the program is by analyzing the loss of each energy consumption equipment of flexible direct current power transmission system, comprehensive energy consumption rate, economy
Property, the factor such as harmonic effects, so that it is determined that the selection of flexible direct current power transmission system efficiency stoichiometric point and theoretical by error propagation
Determine class of accuracy and the error consistency requirement of metering device.
It should be noted that in this manual, term " includes ", " comprising " or its any other variant are intended to
Comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Including process, method, article or the equipment of described key element there is also other identical element.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (9)
1. the efficiency metering method for flexible direct current power transmission system, it is characterised in that for described flexible DC power transmission
Each current conversion station in system, the method includes:
Step S101: determine N number of stoichiometric point, N is the positive integer not less than 2；
Step S102: be respectively mounted electric power meter at N number of described stoichiometric point, wherein, described electric power meter includes using
In the electric current gathering corresponding stoichiometric point current transformer, for gather the voltage transformer of the voltage of described corresponding stoichiometric point with
And the product of described electric current and described voltage is integrated obtaining the electric energy meter of the energy of described corresponding stoichiometric point；
Step S103: according to described in the energy balane that the electric energy meter of two stoichiometric points of arbitrary neighborhood in N number of described stoichiometric point obtains
The energy conversion efficiency of the flexible DC power transmission equipment between adjacent two stoichiometric points.
2. efficiency metering method as claimed in claim 1, it is characterised in that described stoichiometric point includes:
It is positioned at the input of the tietransformer in described current conversion station, stands with becoming end, brachium pontis reactor front end and cable input
End.
3. efficiency metering method as claimed in claim 2, it is characterised in that the method also includes:
The energy obtained according to the electric energy meter of the input of described tietransformer and the electric energy meter of described cable output end obtain
To energy obtain the energy conversion efficiency of described flexible direct current power transmission system.
4. efficiency metering method as claimed in claim 2, it is characterised in that described stoichiometric point also includes cable output end.
5. efficiency metering method as claimed in claim 1, it is characterised in that described current transformer is 0.2S level Current Mutual Inductance
Device.
6. efficiency metering method as claimed in claim 5, it is characterised in that described voltage transformer is 0.2 step voltage mutual inductance
Device.
7. efficiency metering method as claimed in claim 6, it is characterised in that described electric energy meter for meritorious class of accuracy is
The electric energy meter of 0.2S level.
8. efficiency metering method as claimed in claim 1, it is characterised in that described electric energy meter is for having positive and negative bidirectional measuring merit
The electric energy meter of energy.
9. the efficiency metering method as described in any one of claim 1-8, it is characterised in that between step S102 and step S103
Also include:
Adjust the concordance of the electric power meter of two stoichiometric points of arbitrary neighborhood, make described concordance less than 0.05%.
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| CN107085139A (en) * | 2017-05-16 | 2017-08-22 | 国网江苏省电力公司电力科学研究院 | The efficiency metering system and metering method of a kind of electric automobile direct-current charging post |
| CN111679240A (en) * | 2020-04-24 | 2020-09-18 | 国网江苏省电力有限公司营销服务中心 | Direct current voltage on-line measuring device for distributed energy efficiency calibration |
| CN112634079A (en) * | 2020-12-22 | 2021-04-09 | 万帮数字能源股份有限公司 | Electric energy loss calculation method |
| WO2023221426A1 (en) * | 2022-05-16 | 2023-11-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current transmission project loss evaluation method and apparatus, device, and storage medium |
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Effective date of registration: 20161227 Address after: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui Applicant after: Electric Power Research Institute of State Grid Zhejiang Electric Power Company Applicant after: State Power Networks Co Applicant after: State Grid Zhejiang Electric Power Company Address before: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui Applicant before: Electric Power Research Institute of State Grid Zhejiang Electric Power Company Applicant before: State Power Networks Co |
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Application publication date: 20161012 |