CN104123402A - Method and device for calculating line loss of distribution network - Google Patents
Method and device for calculating line loss of distribution network Download PDFInfo
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Abstract
The invention discloses a method and device for calculating the line loss of a distribution network. The distribution network comprises at least one branch line and at least one load point. The method comprises the steps that a reference load curve of the load point is adjusted based on the power measurement value of the load point to generate a predicted load curve of the load point, wherein the reference load curve is a curve of the consumed power of the load point relative to time; the line loss of the distribution network is calculated based on the predicted load curve of the load point. By means of the method and device, the line loss of the distribute network can be calculated more accurately.
Description
Technical field
The present invention relates to distribution network, and be specifically related to a kind of method and apparatus that calculates the line loss of distribution network.
Background technology
In electrical network, by backbone network transferring electric power, electric power in transformation by being provided and delivered to terminal user by distribution network.When electric power transmits in distribution network, due to the impedance of the circuit in network, will produce electric energy loss, i.e. the line loss of distribution network, Zhe Jianggei Utilities Electric Co. brings economic loss.Therefore, management and reduction line loss become the problem that Utilities Electric Co. need to solve.In order to address this problem, need to calculate the line loss of distribution network.
Propose two kinds of line loss computing method, added up line loss computing method and assumption diagram loss computing method.In statistics line loss computing method, by ammeter, measures total delivery of input distribution network and total electric weight of terminal user's consumption, and calculate difference between the two as the line loss of distribution network.Yet in current distribution network, measuring equipment is not enough, can only measure single region within certain period, therefore this method can not be to the computational scheme loss of long-time and a plurality of regions.In addition,, because life period between the measurement distribution network and terminal user are carried out is poor, the line loss that therefore this method is calculated is also inaccurate.In theoretical line loss computing method, according to the load of the parameter of distribution network (such as voltage, impedance etc.) and distribution network, utilize Circuit theory to calculate the line loss of distribution network.Traditional assumption diagram loss computing method comprises rms current method, average current method etc.Compare with statistics line loss computing method, assumption diagram loss computing method can be to the computational scheme loss of long-time and a plurality of regions, and result of calculation is more accurate.
Yet, when using assumption diagram loss computing method to calculate the line loss of distribution network, there is lot of challenges, thereby affect the accuracy of this method.First, in this method, need to select a certainly day as represent day, then based on this, represent the line loss of the calculating distribution networks such as load condition of the distribution network of day.Yet for example, because the load condition of different date type (working day and red-letter day) is widely different, therefore selected representative can not represent the every day in 1 year day, this makes select suitable representative day and be not easy.Secondly, in order to grasp exactly distribution network in intraday load condition, need to install and measure table to measure in real time its load to each load point of distribution network.Yet such real-time measurement equipment is only provided in backbone network (>220kV) at present, and is not provided in distribution network.In addition, even if some distribution network has been equipped with measuring equipment, these measuring equipments are energy measurement equipment often also, and it can only measure the energy consumption data in a period of time, and can not measure power data, so its measurement result can not be for calculating theoretical line loss.In addition, although some distribution networks are equipped with current/voltage/power-measuring device, but due to the restriction of means of communication and cost, these equipment can only provide measurement data with low-down frequency, cause obtaining enough measurement results and carry out computational scheme loss.
For example, in rms current method, use the root mean square at the current value of the distribution network in 24 integral points moment that represents day, by following formula (1), calculate the line loss Δ A of distribution network:
Wherein,
i
1, I
2..., I
24be respectively the current value of 24 integral points distribution network constantly, the resistance that R is distribution network, t is the time.The root mean square of the current measurement value that this method usage quantity is limited is as the current value of distribution network, larger with actual current value deviation, and the line loss of therefore calculating is inaccurate.
Summary of the invention
In view of above problem, the present invention has been proposed.One object of the present invention is to provide a kind of method and apparatus that calculates the line loss of distribution network, and it can calculate the line loss of distribution network more accurately.
According to an aspect of the present invention, a kind of method of calculating the line loss of distribution network is provided, this distribution network comprises at least one branched line and at least one load point, described method comprises: the power measurement values based on described at least one load point is adjusted the reference load curve of this load point, to produce the prediction load curve of described at least one load point, described reference load curve is the curve of the power of this load point consumption with respect to the time; And the prediction load curve based on described at least one load point calculates the line loss of distribution network.
According to another aspect of the present invention, a kind of equipment that calculates the line loss of distribution network is provided, this distribution network comprises at least one branched line and at least one load point, described equipment comprises: curve generation device, be configured to power measurement values based on described at least one load point and adjust the reference load curve of this load point, to produce the prediction load curve of described at least one load point, described reference load curve is the curve of the power of this load point consumption with respect to the time; And loss calculation element, be configured to the line loss that prediction load curve based on described at least one load point calculates distribution network.
In method and apparatus aspect above-mentioned according to the present invention, with the real power measured value of the load point of distribution network, adjust the load curve of this load point, make load curve after adjusting reflect more accurately the power load at this load point place, the line loss of the distribution network that thus, the load curve based on after this adjustment calculates is more accurate.
Accompanying drawing explanation
In conjunction with the drawings disclosure illustrative embodiments is described in more detail, above-mentioned and other object of the present disclosure, Characteristics and advantages will become more obvious, wherein, in disclosure illustrative embodiments, identical reference number represents same parts conventionally.
Fig. 1 shows and is suitable for for realizing the block diagram of the exemplary computer system/server 12 of embodiment of the present invention.
Fig. 2 schematically shows a kind of example of simple distribution network.
Fig. 3 shows the example of pre-stored load curve.
Fig. 4 is the process flow diagram illustrating according to the method for the line loss of the calculating distribution network of the embodiment of the present invention.
Fig. 5 is the figure that the method for the reference load curve of adjusting the load point 1 shown in Fig. 2 is exemplarily described.
Fig. 6 schematically shows the prediction load curve obtaining by adjusting the reference load curve of the load point 2 shown in Fig. 2.
Fig. 7 is the block diagram illustrating according to the equipment of the line loss of the calculating distribution network of the embodiment of the present invention.
Embodiment
Preferred implementation of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown preferred implementation of the present disclosure in accompanying drawing, yet should be appreciated that, can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order to make the disclosure more thorough and complete that these embodiments are provided, and the scope of the present disclosure intactly can be conveyed to those skilled in the art.
Person of ordinary skill in the field knows, the present invention can be implemented as system, method or computer program.Therefore, the disclosure can specific implementation be following form, that is: can be completely hardware, also can be software (comprising firmware, resident software, microcode etc.) completely, can also be the form of hardware and software combination, be commonly referred to as " circuit ", " module " or " system " herein.In addition, in certain embodiments, the present invention can also be embodied as the form of the computer program in one or more computer-readable mediums, comprises computer-readable program code in this computer-readable medium.
Can adopt the combination in any of one or more computer-readable media.Computer-readable medium can be computer-readable signal media or computer-readable recording medium.Computer-readable recording medium for example may be-but not limited to-electricity, magnetic, optical, electrical magnetic, infrared ray or semi-conductive system, device or device, or the combination arbitrarily.The example more specifically of computer-readable recording medium (non exhaustive list) comprising: have the electrical connection, portable computer diskette, hard disk, random-access memory (ram), ROM (read-only memory) (ROM), erasable type programmable read only memory (EPROM or flash memory), optical fiber, Portable, compact disk ROM (read-only memory) (CD-ROM), light storage device, magnetic memory device of one or more wires or the combination of above-mentioned any appropriate.In presents, computer-readable recording medium can be any comprising or stored program tangible medium, and this program can be used or be combined with it by instruction execution system, device or device.
Computer-readable signal media can be included in base band or the data-signal of propagating as a carrier wave part, has wherein carried computer-readable program code.The combination of electromagnetic signal that the data-signal of this propagation can adopt various ways, comprises---but being not limited to---, light signal or above-mentioned any appropriate.Computer-readable signal media can also be any computer-readable medium beyond computer-readable recording medium, and this computer-readable medium can send, propagates or transmit the program for being used or be combined with it by instruction execution system, device or device.
The program code comprising on computer-readable medium can be with any suitable medium transmission, comprises that---but being not limited to---is wireless, electric wire, optical cable, RF etc., or the combination of above-mentioned any appropriate.
Can combine to write for carrying out the computer program code of the present invention's operation with one or more programming languages or its, described programming language comprises object-oriented programming language-such as Java, Smalltalk, C++, also comprise conventional process type programming language-such as " C " language or similar programming language.Program code can fully be carried out, partly on subscriber computer, carries out, as an independently software package execution, part part on subscriber computer, carry out or on remote computer or server, carry out completely on remote computer on subscriber computer.In relating to the situation of remote computer, remote computer can be by the network of any kind---comprise LAN (Local Area Network) (LAN) or wide area network (WAN)-be connected to subscriber computer, or, can be connected to outer computer (for example utilizing ISP to pass through Internet connection).
Process flow diagram and/or block diagram below with reference to method, device (system) and the computer program of the embodiment of the present invention are described the present invention.Should be appreciated that the combination of each square frame in each square frame of process flow diagram and/or block diagram and process flow diagram and/or block diagram, can be realized by computer program instructions.These computer program instructions can offer the processor of multi-purpose computer, special purpose computer or other programmable data treating apparatus, thereby produce a kind of machine, these computer program instructions are carried out by computing machine or other programmable data treating apparatus, have produced the device of the function/operation of stipulating in the square frame in realization flow figure and/or block diagram.
Also these computer program instructions can be stored in and can make in computing machine or the computer-readable medium of other programmable data treating apparatus with ad hoc fashion work, like this, the instruction being stored in computer-readable medium just produces a manufacture (manufacture) that comprises the command device (instruction means) of the function/operation of stipulating in the square frame in realization flow figure and/or block diagram.
Also computer program instructions can be loaded on computing machine, other programmable data treating apparatus or miscellaneous equipment, make to carry out sequence of operations step on computing machine, other programmable data treating apparatus or miscellaneous equipment, to produce computer implemented process, thus the process of function/operation that the instruction that makes to carry out on computing machine or other programmable device is stipulated during the square frame in realization flow figure and/or block diagram can be provided.
Fig. 1 shows and is suitable for for realizing the block diagram of the exemplary computer system/server 12 of embodiment of the present invention.The computer system/server 12 that Fig. 1 shows is only an example, should not bring any restriction to the function of the embodiment of the present invention and usable range.
As shown in Figure 1, computer system/server 12 is with the form performance of universal computing device.The assembly of computer system/server 12 can include but not limited to: one or more processor or processing unit 16, system storage 28, the bus 18 of connection different system assembly (comprising system storage 28 and processing unit 16).
Bus 18 represents one or more in a few class bus structure, comprises memory bus or Memory Controller, peripheral bus, AGP, processor or use any bus-structured local bus in multiple bus structure.For instance, these architectures include but not limited to ISA(Industry Standard Architecture) bus, MCA (MAC) bus, enhancement mode isa bus, VESA's (VESA) local bus and periphery component interconnection (PCI) bus.
Computer system/server 12 typically comprises various computing systems computer-readable recording medium.These media can be any usable mediums that can be accessed by computer system/server 12, comprise volatibility and non-volatile media, movably with immovable medium.
System storage 28 can comprise the computer system-readable medium of volatile memory form, for example random-access memory (ram) 30 and/or cache memory 32.Computer system/server 12 may further include that other is removable/immovable, volatile/non-volatile computer system storage medium.Only as an example, storage system 34 can immovable for reading and writing, non-volatile magnetic medium (Fig. 1 does not show, is commonly referred to " hard disk drive ").Although not shown in Fig. 1, can be provided for for example, disc driver to removable non-volatile magnetic disk (" floppy disk ") read-write, and for example, CD drive to removable non-volatile CD (CD-ROM, DVD-ROM or other light medium) read-write.In these cases, each driver can be connected with bus 18 by one or more data media interfaces.Storer 28 can comprise at least one program product, and this program product has one group of (for example at least one) program module, and these program modules are configured to carry out the function of various embodiments of the present invention.
Program/the utility 40 with one group of (at least one) program module 42, for example can be stored in storer 28, such program module 42 comprises---but being not limited to---operating system, one or more application program, other program module and routine data, may comprise the realization of network environment in each in these examples or certain combination.Program module 42 is carried out function and/or the method in embodiment described in the invention conventionally.
Computer system/server 12 also can with one or more external unit 14(such as keyboard, sensing equipment, display 24 etc.) communicate by letter, also can make the devices communicating that user can be mutual with this computer system/server 12 with one or more, and/or with any equipment that this computer system/server 12 can be communicated with one or more other computing equipments (for example network interface card, modulator-demodular unit etc.) communication.This communication can be undertaken by I/O (I/O) interface 22.And computer system/server 12 can also for example, for example, by network adapter 20 and one or more network (Local Area Network, wide area network (WAN) and/or public network, the Internet) communication.As shown in the figure, network adapter 20 is by other module communication of bus 18 and computer system/server 12.Be understood that, although not shown, can use other hardware and/or software module in conjunction with computer system/server 12, include but not limited to: microcode, device driver, redundant processing unit, external disk drive array, RAID system, tape drive and data backup storage system etc.
Below, will describe in detail according to the method and apparatus of the line loss of the calculating distribution network of the embodiment of the present invention.
As described above, distribution network provides and delivers the electric power of carrying by backbone network to terminal user, it can comprise at least one branched line and at least one load point, wherein, terminal user's consumer is connected to corresponding branched line to receive electric power at each load point place, in other words, load point is the point that terminal user's consumer is connected to corresponding branch circuit (or distribution network) place.Fig. 2 schematically shows a kind of example of simple distribution network.As shown in Figure 2, distribution network can comprise 2 load point and 2 branched lines, and terminal user 1 and 2 consumer are connected to branched line 1 and 2 in load point 1 and 2 places respectively, thereby be connected to distribution network, wherein, branched line can have impedance z1, and branched line 2 can have impedance z2.In more complicated distribution network, can there be more multi-loading point and corresponding branched line.
Because each branched line of distribution network has impedance, therefore, when electric current is flowed through branched line, by inevitably produce power consumption, thereby cause the line loss of distribution network.In an embodiment of the present invention, can the load curve based on each load point calculate the electric current of each branched line, then the line loss of the impedance computation distribution network based on this electric current and each branch circuit.As known in the art, the load curve of load point refers to the curve of the power of this load point consumption with respect to the time.The power of described load point consumption refers to the power consuming in this load point while seeing from distribution network one side, is connected to the power of terminal user's consumption of this load point.
During daily operation, the power of (such as working day, weekend, holiday etc.), different regions terminal user's (such as big city, small city, rural area etc.), dissimilar consumption can be measured the various time periods by Utilities Electric Co., and the performance number based on measuring is drawn the curve of described power with respect to the time, thereby obtain various terminal users' load curve, these load curves by pre-stored to use when needed.As known in the art, the power that terminal user consumes is according to this user's type, geographic position and environment and time etc. and different.Terminal user's type for example comprises industrial user, commercial user and resident.Industrial user is such as being further divided into Aluminium Industry user, food industry user etc.Commercial user is such as being further divided into office building user, shopping center user etc.Therefore, these pre-stored load curves can be corresponding to different terminal user's types, different geographic position, different date type, different weather and/or different environment etc.Fig. 3 shows an example of pre-stored load curve, and this load curve is for example industrial user's load curve.As shown in Figure 3, within one day, the power that terminal user consumes constantly changes, and this curve has two power peaks.
In an embodiment of the present invention, for each load point of distribution network, can from pre-stored load curve, select a load curve.Then, can consider that many factors adjusts the shape of this load curve, and the calculating for line loss by the load curve after adjusting.
Particularly, for each load point, terminal user's that can be corresponding according to this load point (that is, being connected to the terminal user of this load point) characteristic is selected load curve.Described characteristic for example can comprise at least one in terminal user's type, geographic position and environmental information.For example, first, can determine the terminal user's that load point is corresponding host type, described host type is such as comprising industrial user mentioned above, commercial user or resident etc.Then, can determine its subtype according to this terminal user's host type.As mentioned above, for industrial user, its subtype can comprise Aluminium Industry user, food industry user etc., and for commercial user, its subtype can comprise office building user, shopping center user etc.Next, can determine terminal user's geographic position (such as populous city or underpopulated rural area) and environmental information (such as indoor or outdoors, windy area or non-windy area etc.).After having determined terminal user's above-mentioned attribute, can from many pre-stored load curves, select the load curve mating with above-mentioned each attribute (or its part).For example, if the line loss of evaluation work day, and terminal user corresponding to load point is positioned at the office building in city, the load curve that can select the terminal user based on having same alike result to obtain from many pre-stored load curves.
Then, can, according to calculating the type on date of described line loss and at least one item in the weather conditions on this date to it, adjust the shape of selected load curve, and the load curve after use adjustment be as the reference load curve of load point.Particularly, as known in the art, the power that terminal user consumes is also relevant with the type on date and the weather conditions on this date that will calculate described line loss to it.For example, same terminal user is different with the power consuming weekend on weekdays.In addition the power that, same terminal user for example, consumes at different weather (fine day and cloudy day) is not identical yet.Therefore, in an embodiment of the present invention, also according to calculating the type on date of described line loss and at least one item in the weather conditions on this date to it, adjust the shape of selected load curve, so that the impact of the power that this load curve reflection date type and weather consume terminal user.
For example, suppose that the load curve that office building user is selected has two power peaks, one of them power peak is corresponding to the time in the morning, and another power peak is corresponding to the time in afternoon.If this load curve is to statistics acquisition at weekend, and will be working day to the type on the date of its computational scheme loss, because the power that office building user consumes constantly at each is on weekdays higher than weekend, therefore can be by the certain amount of described load curve Integral lifting.In addition, if the temperature on the date that this load curve is corresponding is (for ease of describing, be called the first temperature) lower than will be to the temperature on the date of its computational scheme loss (for ease of describing, be called the second temperature), difference between the power consuming in working time and non-working time due to office building user when the high temperature is high during than low temperature, therefore, two power peaks of this load curve can be improved to certain amount.
Can determine in many ways the amount that promotes load curve and the amount that improves power peak.In first kind of way, can rule of thumb estimate roughly described amount by user, and adjust load curve by described amount.In the second way, can come comparatively accurately to determine described amount according to historical data, thereby adjust described load curve.Particularly, can be from Utilities Electric Co. based on the pre-stored load curve for same type user of historical data, find out two load curves that correspond respectively to working day and weekend, then calculate the whole difference of these two curves, to determine the difference power causing due to different date types, as the amount that promotes load curve; In addition, can from the pre-stored load curve for same type user, find out the load curve that corresponds respectively to the first temperature and the second temperature, then calculate the difference in height at the corresponding peak of these two curves, as the amount that improves described power peak.Certainly, except aforesaid way, also can adopt other modes to adjust described curve, here repeat no more.
In an embodiment of the present invention, for the load point of distribution network, can use load curve after above-mentioned adjustment as its reference load curve, to carry out according to the calculating of the line loss of the embodiment of the present invention.Certainly, in other embodiments, also can not carry out above-mentioned adjusting operation, but directly use the load curve selected according to terminal user corresponding to this load point characteristic as with reference to load curve for calculating below.
Below, with reference to Fig. 4, describe according to the method for the line loss of the calculating distribution network of the embodiment of the present invention.As mentioned above, this distribution network can comprise at least one branched line and at least one load point.
As shown in Figure 4, in step S401, the power measurement values based on described at least one load point is adjusted the reference load curve of this load point, to produce the prediction load curve of described at least one load point.As described above, this reference load curve is the curve of the power of this load point consumption with respect to the time.
As described above, in distribution network, be difficult to obtain the realtime power measured value of load point, but can obtain it in some power measurement values constantly, in an embodiment of the present invention, can adjust based on these power measurement values the reference load curve of load point, for the line loss of distribution network, calculate.
Particularly, after obtaining the power measurement values of described at least one load point, anchor point on the reference load curve of this load point can be moved on the measurement point corresponding with described power measurement values, described anchor point is the time point identical with described measurement point, i.e. the horizontal ordinate point identical with measurement point on load curve.Then, can be in the situation that keep the shape facility of reference load curve, the part on mobile reference load curve except anchor point.Will be appreciated that, as required, described anchor point can be other points on load curve, for example, in horizontal ordinate direction, be positioned near the point described measurement point.
Below, with reference to Fig. 5, this method of adjustment is exemplarily described.Curve 1 shown in Fig. 5 is the reference load curve of the load point 1 of the distribution network shown in Fig. 2.In this example, suppose within one day, to the power measurement of load point 14 times, correspondingly obtain 4 power measurement values, these four power measurement values correspond respectively to measurement point 1-4(and illustrate with rhombus).As shown in Figure 5, the reference load curve substantial deviation of load point 1 measurement point 1-4, therefore, need to adjust this reference load curve.
Particularly, first, the anchor point on the reference load curve of this load point can be moved on the measurement point corresponding with described power measurement values.In the example depicted in fig. 5, the point respectively on load curve with the horizontal ordinate identical with measurement point 1-4 is made as to anchor point 1-4(and by circle, illustrates), and anchor point 1-4 is moved to respectively to measurement point 1-4 above, as shown by arrows.
Then, can be in the situation that keep the shape facility of reference load curve, the part on mobile reference load curve except anchor point, i.e. part between each anchor point on described curve.The shape facility of described reference load curve refers to and can determine the shape of load curve or the feature of general shape, such as the quantity of power peak and/or power paddy and position etc.The object that keeps the shape facility of reference load curve is to make load curve through adjusting (, prediction load curve) shape is substantially the same with the shape of reference load curve, although this is that its shape should be roughly the same with realized load curve because described reference load curve may depart from the realized load curve of load point on occurrence.
Can be by the part except anchor point on the mobile reference load curve of various ways.In a kind of mode, the part between anchor point 1 and anchor point 2 can be divided into a plurality of sections (for ease of describing, be assumed to be n section, wherein n >=2 and be the bigger the better), wherein, the power peak of reference load curve or power paddy are preferably arranged in a section.Then, can be by the performance number of this n section respectively divided by ratio d
1, d
2... d
n, wherein, ratio d
1, d
2... d
nvalue at anchor point 1 the ratio d with the performance number of measurement point 1
lwith the ratio d of anchor point 2 with the performance number of measurement point 2
rbetween, and d
l, d
1, d
2... d
n, d
rbe Geometric Sequence.Like this, by by the performance number of each section between anchor point 1 and anchor point 2 divided by different ratios, can mobile anchor point 1 and anchor point 2 between part.Can move similarly the part between other anchor points, keep the feature of reference load curve simultaneously.In another kind of mode, d
l, d
1, d
2... d
n, d
rcan be arithmetic progression.In another mode, d
1, d
2... d
ncan get d
land d
rbetween and increase progressively (d
l<d
rtime) or (d that successively decreases
l>d
rtime) other values.
By adjusting as mentioned above the reference load curve of load point, all measurement points that can make reference load curve (the predicting load curve) process after adjusting obtain for this load point, make this prediction load curve more approach the realized load curve of this load point.
All the other each load point for distribution network, can repeat said process, thereby determine its prediction load curve.In the example shown in Fig. 2, the example of the prediction load curve of definite load point 2 as shown in Figure 6 according to the method described above.
Return to Fig. 4, in step S402, the prediction load curve based on described at least one load point calculates the line loss of distribution network.
Briefly, prediction load curve based on described at least one load point, can calculate the electric current on described at least one branched line, then, electric current that can be based on described at least one branched line, calculates the line loss of distribution network by time proximity integral operation.
Particularly, can carry out to calculate based on prediction load curve by power flow computing method well known in the art the line loss of distribution network.Below, the method for calculating the line loss of distribution network based on prediction load curve is exemplarily described in connection with the example of the distribution network shown in Fig. 2, the load point 1 shown in Fig. 2 and 2 prediction load curve are respectively shown in Fig. 5 and Fig. 6.
As shown in Figure 2, the output voltage of supposing backbone network bus place is U
0, complex power and the voltage at load point 1 place are respectively S
1and U
1, complex power and the voltage at load point 2 places are respectively S
2and U
2.In addition, as described above, the impedance of branched line 1 and branched line 2 is respectively z
1and z
2.Here, U
0, z
1and z
2known.For the sake of simplicity, the complex power S that ignores load point 1 and load point 2 here
1and S
2in reactance capacity, therefore, S
1can be reduced to P
1, S
2can be reduced to P
2, wherein, P
1and P
2for the active power of load point 1 and 2, it can be definite according to the prediction load curve of load point 1 and 2 respectively, correspondingly, and impedance z
1and z
2can be reduced to respectively resistance r
1and r
2.
Known according to Circuit theory, at any time, a demand goes out the electric current I of branched line 1 and 2
1and I
2, just can pass through the power attenuation P that following formula (2) calculates distribution network
loss:
Then, can to the integration of time t, determine the line loss E of distribution network within a time period by described power attenuation
loss, shown in (3):
On mathematics, as the abundant moment rated output loss P in this time period
losssituation under, above formula (3) can be reduced to:
Wherein, the quantity that m is the described moment, for example, be that 24 or more, i is integer.
As example, can based on prediction load curve, determine by process of iteration the electric current I of branched line 1 and 2
1and I
2.Particularly, for any time, by U
1value during each iteration is designated as
, by U
2value during each iteration is designated as
In addition, suppose that the electric current on the circuit between terminal user 1 and load point 1 is I
l1, its value during each iteration is designated as
, the electric current on the circuit between terminal user 2 and load point 2 is I
l2, its value during each iteration is designated as
Initially, can establish
?
Then, can determine need to be right
the amount reducing
and need to be right
the amount reducing
Thus, can determine in next iteration
For
with
determine that it is with respect to the U in last iteration
1and U
2value (
with
) rate of change whether be greater than predetermined threshold.If described rate of change is greater than predetermined threshold, based on
with
proceed above-mentioned iterative process, until described rate of change is not more than predetermined threshold.Otherwise, when described rate of change is not more than predetermined threshold, stop above-mentioned iterative process, and use I
1and I
2currency, as the current value in branched line.Described predetermined threshold can be selected according to actual needs, for example, be 10
-6.
For each, constantly repeat above-mentioned computation process, thereby calculate the current value in each branched line of distribution network in this moment.Then, by above formula (2) and (4), can calculate the line loss of distribution network.
Below, with reference to Fig. 7, describe according to the equipment of the line loss of the calculating distribution network of the embodiment of the present invention.This equipment can be carried out the method for describing with reference to Fig. 4 hereinbefore by each following device.
As shown in Figure 7, line loss computing equipment 700 can comprise Curve selection device 701, curve adjusting apparatus 702, curve generation device 703 and loss calculation element 704.
Curve selection device 701, for each load point of distribution network, is selected a load curve from pre-stored load curve.Particularly, Curve selection device 701, for each load point, can be selected load curve according to terminal user corresponding to this load point characteristic.As described above, described characteristic for example can comprise at least one in terminal user's type, geographic position and environmental information.
Curve adjusting apparatus 702, according to calculating the type on date of described line loss and at least one item in the weather conditions on this date to it, is adjusted the shape of the load curve of Curve selection device 701 selections.Curve adjusting apparatus 702 can carry out this adjusting operation according to mode mentioned above, omits its detailed description here for fear of repetition.
Will be appreciated that, although Curve selection device 701 and curve adjusting apparatus 702 are depicted as to a part for equipment 700 in Fig. 7, but in equipment 700, these two devices also can be set, but manually carry out above-mentioned selection and adjusting operation by for example user, and resulting reference load curve is offered to equipment 700.In addition, in other embodiments, also Curve selection device 701 can be only set, and curve adjusting apparatus 702 is not set, make load curve that direct use curve selecting arrangement 701 selects as with reference to load curve for calculating below.
The power measurement values of curve generation device 703 based on described at least one load point adjusted the reference load curve of this load point, to produce the prediction load curve of described at least one load point.As described above, this reference load curve is the curve of the power of this load point consumption with respect to the time.Thereby curve generation device 703 can produce prediction load curve according to adjusting reference load curve with reference to the mode of Fig. 4 and Fig. 5 description hereinbefore.Particularly, received the power measurement values of described at least one load point from outside after, curve generation device 703 can move to the anchor point on the reference load curve of this load point on the measurement point corresponding with described power measurement values, described anchor point is the time point identical with described measurement point, i.e. the horizontal ordinate point identical with measurement point on load curve.Then, can be in the situation that keep the shape facility of reference load curve, the part on mobile reference load curve except anchor point.The shape facility of described reference load curve refers to and can determine the shape of load curve or the feature of general shape, such as the quantity of power peak and/or power paddy and position etc.Will be appreciated that, as required, described anchor point can be other points on load curve, for example, in horizontal ordinate direction, be positioned near the point described measurement point.
The prediction load curve of loss calculation element 704 based on described at least one load point calculates the line loss of distribution network.Briefly, loss calculation element 704 can be based on described at least one load point prediction load curve, calculate the electric current on described at least one branched line, then, electric current that can be based on described at least one branched line, calculates the line loss of distribution network by the computing of (being similar to) time integral.Loss calculation element 704 can, by calculate hereinbefore the line loss of distribution network with reference to the methods of Fig. 2 and 4 descriptions, here repeat no more.
According in the method and apparatus of the above-mentioned computational scheme loss of the embodiment of the present invention, the load point reference load curve obtaining based on historical data according to measurement point optimization, makes produced prediction load curve more approach the realized load curve of load point.In addition, according to the method for the above-mentioned computational scheme loss of the embodiment of the present invention, be actually the line loss of calculating distribution network by (being similar to) integral operation to the time, with based on several current measurement values, by the classic method of above formula (1) computational scheme loss, compare, result of calculation is more accurate.In addition, according to the application of the said method of the embodiment of the present invention and equipment, be not limited to concrete time and region, therefore can calculate to long-time and a plurality of regions the line loss of distribution network.
Process flow diagram in accompanying drawing and block diagram have shown the system according to a plurality of embodiment of the present invention, architectural framework in the cards, function and the operation of method and computer program product.In this, each square frame in process flow diagram or block diagram can represent a part for module, program segment or a code, and a part for described module, program segment or code comprises one or more for realizing the executable instruction of the logic function of regulation.Also it should be noted that what the function marking in square frame also can be marked to be different from accompanying drawing occurs in sequence in some realization as an alternative.For example, in fact two continuous square frames can be carried out substantially concurrently, and they also can be carried out by contrary order sometimes, and this determines according to related function.Also be noted that, each square frame in block diagram and/or process flow diagram and the combination of the square frame in block diagram and/or process flow diagram, can realize by the special-purpose hardware based system of the function putting rules into practice or operation, or can realize with the combination of specialized hardware and computer instruction.
Below described various embodiments of the present invention, above-mentioned explanation is exemplary, exhaustive not, and be also not limited to each disclosed embodiment.In the situation that do not depart from the scope and spirit of each illustrated embodiment, many modifications and changes are all apparent for those skilled in the art.The selection of term used herein, is intended to explain best principle, practical application or the technological improvement to the technology in market of each embodiment, or makes other those of ordinary skill of the art can understand each embodiment disclosing herein.
Claims (10)
1. calculate a method for the line loss of distribution network, this distribution network comprises at least one branched line and at least one load point, and described method comprises:
Power measurement values based on described at least one load point is adjusted the reference load curve of this load point, and to produce the prediction load curve of described at least one load point, described reference load curve is the curve of the power of this load point consumption with respect to the time; And
Prediction load curve based on described at least one load point calculates the line loss of distribution network.
2. the method for claim 1, also comprises:
According at least one item in user corresponding to described at least one load point type, geographic position and environmental information, from many pre-stored load curves, select load curve, as described reference load curve.
3. the method for claim 1, also comprises:
According at least one item in user corresponding to described at least one load point type, geographic position and environmental information, from many pre-stored load curves, select load curve; And
According to calculating the type on date of described line loss and at least one item in the weather conditions on this date to it, adjust the shape of selected load curve, as described reference load curve.
4. the method as described in one of claim 1-3, wherein, the reference load curve that the power measurement values based on described at least one load point is adjusted this load point comprises:
With reference to the anchor point on load curve, move on the measurement point corresponding with described power measurement values, described anchor point is the time point identical with described measurement point; And
In the situation that keep the shape facility of reference load curve, the part on mobile reference load curve except anchor point.
5. the method as described in one of claim 1-3, the line loss that wherein the prediction load curve based on described at least one load point calculates distribution network comprises:
Prediction load curve based on described at least one load point, calculates the electric current on described at least one branched line;
Electric current based on described at least one branched line, calculates the line loss of distribution network by time proximity integral operation.
6. calculate an equipment for the line loss of distribution network, this distribution network comprises at least one branched line and at least one load point, and described equipment comprises:
Curve generation device, be configured to power measurement values based on described at least one load point and adjust the reference load curve of this load point, to produce the prediction load curve of described at least one load point, described reference load curve is the curve of the power of this load point consumption with respect to the time; And
Loss calculation element, is configured to the line loss that prediction load curve based on described at least one load point calculates distribution network.
7. equipment as claimed in claim 6, also comprises:
Curve selection device, is configured to, according at least one in user corresponding to described at least one load point type, geographic position and environmental information, select load curve, as described reference load curve from many pre-stored load curves.
8. equipment as claimed in claim 6, also comprises:
Curve selection device, is configured to, according at least one in user corresponding to described at least one load point type, geographic position and environmental information, from many pre-stored load curves, select load curve; And
Curve adjusting apparatus, is configured to, according to calculating the type on date of described line loss and at least one item in the weather conditions on this date to it, adjust the shape of selected load curve, as described reference load curve.
9. the equipment as described in one of claim 6-8, wherein, described curve generation device moves on the measurement point corresponding with described power measurement values with reference to the anchor point on load curve, and in the situation that keep the shape facility of reference load curve, part on mobile reference load curve except anchor point, to adjust described reference load curve, wherein, described anchor point is the time point identical with described measurement point.
10. the equipment as described in one of claim 6-8, the prediction load curve of wherein said loss calculation element based on described at least one load point, calculate the electric current on described at least one branched line, and the electric current based on described at least one branched line, calculates the line loss of distribution network by time proximity integral operation.
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Effective date of registration: 20181026 Address after: Valhalla, New York, USA Patentee after: Utopas insight company Address before: New York grams of Armand Patentee before: International Business Machines Corp. |