CN108680788A - Harmonic voltage transmission level computational methods and device - Google Patents
Harmonic voltage transmission level computational methods and device Download PDFInfo
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- CN108680788A CN108680788A CN201810528687.4A CN201810528687A CN108680788A CN 108680788 A CN108680788 A CN 108680788A CN 201810528687 A CN201810528687 A CN 201810528687A CN 108680788 A CN108680788 A CN 108680788A
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Abstract
A kind of harmonic voltage transmission level computational methods of proposition of the embodiment of the present invention and device, are related to technical field of power systems.By obtaining multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple harmonic currents in power grid, multiple harmonic voltages according to points of common connection, the harmonic impedance of multiple harmonic currents and preset wind farm side obtains multiple harmonic currents of wind farm side, multiple harmonic voltages according to points of common connection, the harmonic impedance of multiple harmonic currents of wind farm side and the compound linear regression equation calculation system side pre-established, harmonic impedance according to system side, multiple harmonic voltages of points of common connection, multiple harmonic currents of points of common connection and the harmonic impedance of wind farm side obtain the harmonic voltage transmission level of wind farm side.The application considers that the influence of the harmonic impedance of wind farm side calculates harmonic voltage transmission level using the harmonic current of wind farm side as the explanatory variable of compound linear regression equation, calculates error smaller.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of harmonic voltage transmission level computational methods
And device.
Background technology
In recent years, the renewable energy power generation technology based on wind energy gradually becomes the pollution of mankind's response environment and energy danger
One of the important means of machine.Part wind-driven generator is by gird-connected inverter incoming transport power grid, however wind-electricity integration inverter
Electric harmonic is will produce with pulsewidth modulation unsteady flow mode during used electronic power switch, and harmonic pollution will influence power grid
Economy and safe operation.
The harmonic wave of the points of common connection (Point of Common Coupling, PCC) of wind power plant is by inside wind power plant
With external electrical network harmonic source (as points of common connection background harmonics) coefficient result.Background harmonics have uncertainty simultaneously
Usual immeasurability must not believe that points of common connection harmonic voltage is all produced by wind power plant harmonic source when background harmonics are larger
It is raw, therefore it is necessary to assess wind power plant in the harmonic pollution responsibility of its grid entry point according to live harmonic measure, but it with the proviso that closes
The harmonic emission level of reason assessment wind farm side.
Current " non-intervention formula " harmonic emission level assessment method includes mainly undulate quantity method, linear regression method, random
Independent vector method, Maximum Likelihood Estimation Method, isolated component method etc. assume that user-side harmonic impedance is remote in these appraisal procedures
More than system side harmonic impedance, to when calculating user-side harmonic emission level, ignore user-side harmonic impedance.For typical case
Industrial non-linear customer (industrial rectification load, electric arc furnaces etc.), above-mentioned hypothesis are set up, but when wind turbine inverter outlet configures
When filter, current collection point configuration reactive power compensator, wind farm side (being equivalent to user side) harmonic impedance may be caused not remote
More than system side harmonic impedance, in the case, if ignoring the influence of wind farm side harmonic impedance, harmonic emissions water will increase
Flat calculating error.
Invention content
The embodiment of the present invention is designed to provide a kind of harmonic voltage transmission level computational methods and device, to reduce wind
The calculating error of electric field side harmonic voltage transmission level improves accuracy.
Technical solution used in the embodiment of the present invention is as follows：
In a first aspect, the embodiment of the present invention proposes a kind of harmonic voltage transmission level computational methods, the method includes：It obtains
Take multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple harmonic currents in power grid；According to described public
The harmonic wave of multiple harmonic voltages of tie point, multiple harmonic currents of the points of common connection and the preset wind farm side
Impedance obtains multiple harmonic currents of the wind farm side, wherein the harmonic impedance of the preset wind farm side passes through
Each component parameters in the wind farm side are calculated；Multiple harmonic voltages, the wind-powered electricity generation according to the points of common connection
The harmonic impedance of system side described in multiple harmonic currents of field side and the compound linear regression equation calculation pre-established, wherein
The harmonic voltage of the points of common connection is the explained variable of the compound linear regression equation pre-established, the wind power plant
The harmonic current of side is the explanatory variable of the compound linear regression equation pre-established；Harmonic wave according to the system side hinders
Multiple harmonic voltages of anti-, described points of common connection, multiple harmonic currents of the points of common connection and the wind farm side
Harmonic impedance obtain the harmonic voltage transmission level of the wind farm side.
Second aspect, the embodiment of the present invention also propose that a kind of harmonic voltage transmission level computing device, described device include：
Data acquisition module, for obtaining in power grid multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple humorous
Wave electric current；Wind farm side harmonic current acquisition module, for multiple harmonic voltages, described public according to the points of common connection
The harmonic impedance of multiple harmonic currents of tie point and the preset wind farm side obtains the multiple humorous of the wind farm side
Wave electric current, wherein the harmonic impedance of the preset wind farm side passes through each component parameters meter in the wind farm side
It obtains；System side harmonic impedance acquisition module, for multiple harmonic voltages according to the points of common connection, the wind power plant
The harmonic impedance of system side described in multiple harmonic currents of side and the compound linear regression equation calculation pre-established, wherein institute
The harmonic voltage for stating points of common connection is the explained variable of the compound linear regression equation pre-established, the wind farm side
Harmonic current be the compound linear regression equation pre-established explanatory variable；Harmonic voltage transmission level acquisition module,
For multiple harmonic voltages of harmonic impedance, the points of common connection according to the system side, the points of common connection it is more
The harmonic impedance of a harmonic current and the wind farm side obtains the harmonic voltage transmission level of the wind farm side.
It is commonly connected by obtaining in harmonic voltage transmission level computational methods and device that the embodiment of the present invention is provided
The multiple harmonic voltages and multiple harmonic currents of point, multiple harmonic voltages, described commonly connected according to the points of common connection
Multiple harmonic currents of point and the harmonic impedance of the preset wind farm side obtain multiple harmonic waves electricity of the wind farm side
Stream, according to multiple harmonic voltages of the points of common connection, multiple harmonic currents of the points of common connection and preset institute
The harmonic impedance for stating wind farm side obtains multiple harmonic currents of the wind farm side, according to the system side harmonic impedance,
Multiple harmonic voltages of the points of common connection, multiple harmonic currents of the points of common connection and the wind farm side it is humorous
Wave impedance obtains the harmonic voltage transmission level of the wind farm side.Due to the application in compound linear regression equation by wind power plant
The harmonic current of side ensure that the precision of compound linear regression equation, and in the harmonic wave for considering wind farm side as explanatory variable
The harmonic emission level of wind farm side, therefore error smaller, accuracy higher are calculated on the basis of the influence of impedance.
Other features and advantages of the present invention will be illustrated in subsequent specification, also, partly be become from specification
It is clear that by implementing understanding of the embodiment of the present invention.The purpose of the present invention and other advantages can be by saying what is write
Specifically noted structure is realized and is obtained in bright book, claims and attached drawing.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the structure diagram for the electronic equipment that the embodiment of the present invention is provided.
Fig. 2 shows the flow diagrams for the harmonic voltage transmission level computational methods that the embodiment of the present invention is provided.
Fig. 3 shows the schematic diagram of the system that the embodiment of the present invention is provided and wind power plant equivalent circuit.
Fig. 4 shows the topological structure schematic diagram for the wind power plant that the embodiment of the present invention is provided.
Fig. 5 shows the harmonic-model schematic diagram for the permanent magnetic direct-drive fan that the embodiment of the present invention is provided.
Fig. 6 shows the sub-step schematic diagram of step S103 in Fig. 2.
Fig. 7 shows the sub-step schematic diagram of step S104 in Fig. 2.
Fig. 8 shows another flow signal for the harmonic voltage transmission level computational methods that the embodiment of the present invention is provided
Figure.
Fig. 9 shows the function module signal for the harmonic voltage transmission level computing device that the embodiment of the present invention is provided
Figure.
Figure 10 shows the concrete structure schematic diagram of system side harmonic impedance acquisition module in Fig. 9.
Figure 11 shows the concrete structure schematic diagram of harmonic voltage transmission level acquisition module in Fig. 9.
Icon：100- electronic equipments；500- harmonic voltage transmission level computing devices；110- memories；120- processors；
130- communication interfaces；510- data acquisition modules；520- wind farm side harmonic current acquisition modules；530- system side harmonic impedances
Acquisition module；540- harmonic voltage transmission level acquisition modules；531- the first regression coefficient computing modules；532- system side harmonic waves
Impedance computation module；541- harmonic voltage transmission level computing modules；542- harmonic voltage transmission level determining modules.
Specific implementation mode
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
The every other embodiment obtained under the premise of going out creative work, shall fall within the protection scope of the present invention.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
The harmonic voltage transmission level computational methods and device that the embodiment of the present invention is provided can be applicable to electricity shown in FIG. 1
In sub- equipment 100.In the present embodiment, electronic equipment 100 may be, but not limited to, PC (personal
Computer, PC), tablet computer, desktop computer etc..The operating system of electronic equipment 100 may be, but not limited to, Android
(Android) system, IOS (iPhone operating system) system, Windows phone systems, Windows systems
Deng.
The electronic equipment 100 may include memory 110, processor 120 and communication interface 130, memory 110, processing
Device 120 and communication interface 130, each element are directly or indirectly electrically connected between each other, to realize the transmission or interaction of data.
It is electrically connected for example, these elements can be realized between each other by one or more communication bus or signal wire.Processor 120 is used
In executing the executable module stored in memory 110, such as computer program.
Wherein, memory 110 may be, but not limited to, random access memory (Random Access Memory,
RAM), read-only memory (Read Only Memory, ROM), programmable read only memory (Programmable Read-Only
Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only Memory, EPROM),
Electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only Memory, EEPROM) etc..
Memory 110 can be used for storing software program and module, harmonic voltage transmission level computing device 500 include it is at least one can
It is stored in memory 110 in the form of software or firmware (firmware) or is solidificated in the operating system of electronic equipment 100
Software function module in (operating system, OS).The processor 120 executes one after receiving and executing instruction
A or multiple programs are to realize the harmonic voltage transmission level computational methods of the embodiment of the present application announcement.The communication interface 130 can
Communication for carrying out signaling or data with other node devices.
Processor 120 may be a kind of IC chip, have signal handling capacity.The processor 120 can be logical
With processor, including central processing unit (Central Processing Unit, CPU), network processing unit (Network
Processor, NP) etc.；Can also be digital signal processor (DSP)), application-specific integrated circuit (ASIC), ready-made programmable gate
Array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.
It is appreciated that structure shown in FIG. 1 is only to illustrate, electronic equipment 100 may also include it is more than shown in Fig. 1 or
Less component, or with the configuration different from shown in Fig. 1.Each component shown in Fig. 1 may be used hardware, software or its
Combination is realized.
Fig. 2 is please referred to, by the flow diagram for the harmonic voltage transmission level computational methods that the embodiment of the present invention provides.
It should be noted that harmonic voltage transmission level computational methods described in the embodiment of the present invention are not with Fig. 2 and as described below
Particular order be limitation, it should be understood that in other embodiments, harmonic voltage transmission level computational methods of the present invention
The sequence of which part step can be exchanged with each other according to actual needs or part steps therein can also be omitted or be deleted
It removes.The harmonic voltage transmission level computational methods can be applied to above-mentioned electronic equipment 100, below will be to shown in Fig. 2 specific
Flow is described in detail.
Step S101 obtains in power grid multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple humorous
Wave electric current.
In the present embodiment, can be arranged for detecting harmonic wave at the points of common connection of system side and wind farm side in power grid
The detection device of voltage and harmonic current, the detection device are led to by the communication interface 130 with above-mentioned electronic equipment 100
The multiple harmonic voltages detected in predetermined time and multiple harmonic currents are sent to electronic equipment 100 by letter.It is appreciated that
It is in the present embodiment each harmonic wave that will be obtained that multiple harmonic voltage has one-to-one relationship with multiple harmonic currents
As one group of measurement data, such electronic equipment 100 actually needs to obtain multigroup measurement number the corresponding harmonic current of voltage
According to.
Step S102, multiple harmonic voltages, the multiple harmonic waves of the points of common connection according to the points of common connection are electric
The harmonic impedance of stream and the preset wind farm side obtains multiple harmonic currents of the wind farm side, wherein described pre-
If the harmonic impedance of the wind farm side be calculated by each component parameters in the wind farm side.
In the present embodiment, mould is assessed as harmonic emission level using system shown in Fig. 3 and wind power plant equivalent circuit
Type is analyzed.As shown in figure 3,WithHarmonic voltage and the harmonic wave electricity of respectively PCC points (i.e. points of common connection)
Stream, ZCAnd ZSThe respectively harmonic impedance of the harmonic impedance of wind farm side and system side,For the harmonic wave electricity of the wind farm side
Stream,For system side background harmonic voltage.
In the present embodiment, according to Kirchhoff's current law (KCL), the calculation formula of the harmonic current of the wind farm side is：It can be seen that.For each group of measurement data (i.e. the harmonic voltage of points of common connection with it is commonly connected
The harmonic current of point), the humorous of corresponding wind farm side can be calculated according to the calculation formula of the harmonic current of the wind farm side
Wave electric current, in this way, just obtaining multiple harmonic currents of wind farm side.
Equivalent circuit as shown in Figure 3 can obtain, and the harmonic voltage of points of common connection is：
As it can be seen that the harmonic voltage of points of common connectionIt is the harmonic current by wind farm sideIt is humorous with system side background
Wave voltageIt is coefficient as a result, andWith ZCAnd ZSBetween it is orthogonal.
In the present embodiment, the harmonic impedance Z of wind farm sideCMainly by inverter outlet outside filter, transformer, line
The elements such as road and reactive-load compensation capacitor determine, therefore can be calculated by each component parameters in wind farm side, wherein member
Part parameter may include, but be not limited to, inductance value, capacitance etc..For example, by taking practical wind power plant shown in Fig. 4 as an example, wind-powered electricity generation production
Include by wind turbine, the collection electric network and reactive-load compensation capacitor that case becomes and circuit forms, when PCC points are located at wind power plant current collection point
When, the harmonic impedance of wind farm side is the total impedance in parallel for collecting electric network and reactive-load compensation capacitor, each member wherein in wind power plant
The computational methods of the harmonic impedance of part are as follows：
A) wind turbine
Assuming that wind turbine is permanent magnetic direct-drive fan, full power convertor is used, by generator-side converter wear, net side current transformer
It is constituted with LCL filter.Since generator-side converter wear and net side current transformer are separated by DC capacitor, the harmonic characterisitic of wind turbine is only by net
Side LCL type inverter determines.Inverter will produce harmonic wave using PWM modulation, if DC voltage is steady, go out to net side inverter
For mouthful, a harmonic voltage source can be equivalent to.As shown in figure 5, for the harmonic-model of permanent magnetic direct-drive fan, UhFor harmonic wave electricity
Potential source, LinvFor inverter side inductance, CfFor filter capacitor, RhFor damping resistance, LgFor net side inductance.By LCL filter parameter
Obtain the harmonic impedance Z of wind turbineWFor：
B) transformer
The harmonic impedance model of inductance series resistance can be used in transformer, then the harmonic impedance Z of transformerTFor：ZT(s)=
sLT+RT, wherein LTFor the equivalent inductance of transformer, RTFor the substitutional resistance of transformer.
C) reactive-load compensation capacitor
The impedance model of capacitor series inductance and resistance can be used in reactive-load compensation capacitor, then its impedance is represented by：Wherein, C is the capacitance of capacitor, and L is serial inductance, and R is the resistance of capacitor branches.
D) collect electric line
Because the harmonic impedance of collection electric line is much smaller than wind turbine, the harmonic impedance of transformer, reactive-load compensation capacitor, therefore can be with
Ignore line harmonic impedance.
As it can be seen that the harmonic impedance of wind farm side and the harmonic voltage of points of common connection are unrelated with harmonic current, basis is only needed
Each element in wind power plant can be calculated in the impedance model of the component parameters such as capacitance, inductance, resistance and element in wind power plant
Harmonic impedance, the harmonic impedance of wind farm side then can be calculated according to the connection in series-parallel relationship of each element, in other words,
In the application, the harmonic impedance of wind farm side can be by precalculating to obtain and be stored in electronic equipment 100, then directly
Calculating as preset value for harmonic voltage transmission level.
Step S103, according to multiple harmonic voltages of the points of common connection, multiple harmonic currents of the wind farm side
And the harmonic impedance of system side described in the compound linear regression equation calculation pre-established, wherein the points of common connection it is humorous
Wave voltage is the explained variable of the compound linear regression equation pre-established, and the harmonic current of the wind farm side is described
The explanatory variable of the compound linear regression equation pre-established.
In this example, it is assumed that system side background harmonic voltageIt is steady random, and meets：
Wherein, E indicates mathematic expectaion, εsFor multiple deviation.
Therefore the compound linear recurrence side between the harmonic voltage of points of common connection and the harmonic current of wind farm side can be established
Cheng Wei：Wherein, β1For first regression coefficient, β0For the second regression coefficient, ε is that plural number is inclined
Poor item.According to linear regression principle, correlation, and β should be not present with regression coefficient in explanatory variable1、β0, ε is represented by：
In this application, in the prior art use points of common connection harmonic currentExplanation as regression equation
Variable is compared, by wind farm side harmonic wave ource electric currentAs the explanatory variable of compound linear regression equation, it ensure that compound linear returns
The precision of equation, this is because when considering the influence of harmonic impedance of wind farm side, the harmonic current of points of common connection
With system side background harmonic voltageThere are correlations, and the calculating for influencing the first regression coefficient and the second regression coefficient is accurate
Property, and wind farm side harmonic wave ource electric currentWith system side background harmonic voltageIt is uncorrelated, therefore can ensure that compound linear returns
The precision of equation.
As shown in fig. 6, in the present embodiment, step S103 specifically includes following sub-step：
Sub-step S1031, multiple harmonic voltages, the multiple harmonic waves of the wind farm side according to the points of common connection are electric
First regression coefficient described in stream and the compound linear regression equation calculation pre-established.
Sub-step S1032 calculates the system according to the harmonic impedance of first regression coefficient and the wind farm side
The harmonic impedance of side.
In this example, it is assumed that the harmonic current of points of common connection and the harmonic current of points of common connection have the measurement of n groups
Data substitute into compound linear regression equation respectivelyIt obtains：
Formula (1), which is expressed as matrix form, is：
Y=Ax+ ε (2)
In formula (2),
To make the quadratic sum of plural deviation ε reach minimum, can be obtained by multiple least square method：
Wherein, "-" indicates the conjugation of vector.
Complex vector x is being calculated to get to the first regression coefficient β1With the second regression coefficient β0, then according to system
The calculation formula of the harmonic impedance of side is：The harmonic impedance of system side can be calculated.
Step S104, according to the harmonic impedance of the system side, multiple harmonic voltages of the points of common connection, the public affairs
Multiple harmonic currents of tie point and the harmonic impedance of the wind farm side obtain the harmonic voltage hair of the wind farm side altogether
Jetting is flat.
As shown in fig. 7, step S104 specifically includes following sub-step：
Sub-step S1041, according to the harmonic impedance of the system side, multiple harmonic voltages of the points of common connection, institute
The harmonic impedance of the multiple harmonic currents and the wind farm side of stating points of common connection obtains the multiple humorous of the wind farm side
Wave voltage emission level.
In the present embodiment, according to principle of stacking and Ohm's law, the harmonic voltage transmission level of the wind farm side
Calculation formula is：Wherein,Emit for the harmonic voltage of the wind farm side
Level, in the harmonic impedance Z for calculating system sideSAfterwards, according to the harmonic impedance Z of n groups measurement data, system sideS, wind farm side
Harmonic impedance ZCN harmonic voltage transmission level can be calculated.
Sub-step S1042 determines target harmonic voltage from multiple harmonic voltage transmission levels of the wind farm side
Emission level, and using the target harmonic voltage transmission level as the harmonic voltage transmission level of the wind farm side.
In this application, can root determine target harmonic voltage transmission level according to the rule pre-set, the rule
Can be：Multiple harmonic voltage transmission levels of wind farm side are sorted according to sequence from big to small or from small to large, so
The data for excluding 5% since maximum harmonic voltage transmission level afterwards, then will be maximum humorous in remaining 95% data
Wave voltage emission level determines target harmonic voltage transmission level.For example, as n=100, wind farm side is finally calculated
100 harmonic voltage transmission levels are ranked up time, remove maximum 5 harmonic wave electricity by 100 harmonic voltage transmission levels
Emission level is pressed, then emits water using the maximum value in remaining 95 harmonic voltage transmission levels as target harmonic voltage
It is flat.At this point, the target harmonic voltage transmission level is the harmonic voltage transmission level of finally obtained wind farm side.
As it can be seen that compared with the existing mode for ignoring user-side harmonic impedance computation harmonic emission level, present application contemplates
The influence of the harmonic impedance of wind farm side reduces calculating error.
Further, as shown in figure 8, in the present embodiment, the method further includes：
Step S105, according to the wind farm side multiple harmonic voltage transmission levels and the points of common connection it is multiple
Harmonic voltage obtains multiple harmonic voltage transmission levels of the system side, emits water from multiple harmonic voltages of the system side
The harmonic voltage transmission level of the system side is determined in flat.
In the present embodiment, due to the harmonic voltage of points of common connectionIt is the harmonic current by wind farm sideWith
System side background harmonic voltageIt is coefficient as a result, after calculating multiple harmonic voltage transmission levels of wind farm side,
According to formulaMultiple harmonic voltage transmission levels of system side can be calculated, then from the system
The harmonic voltage transmission level of the system side is determined in multiple harmonic voltage transmission levels of system side.Wherein, system side
The harmonic voltage transmission level that the method for determination of harmonic voltage transmission level can refer to above-mentioned wind farm side is established rules then really, this
Place repeats no more.
Fig. 9 is please referred to, by the function module for the harmonic voltage transmission level computing device 500 that the embodiment of the present invention provides
Schematic diagram.It should be noted that the harmonic voltage transmission level computing device 500 that the present embodiment is provided, basic principle and
The technique effect of generation is identical as preceding method embodiment, to briefly describe, does not refer to part in the present embodiment, can refer to aforementioned
Corresponding contents in embodiment of the method.The harmonic voltage transmission level computing device 500 is applied to above-mentioned electronic equipment
100 comprising data acquisition module 510, wind farm side harmonic current acquisition module 520, system side harmonic impedance acquisition module
530, harmonic voltage transmission level acquisition module 540.
The data acquisition module 510 is used to obtain multiple harmonic waves of the points of common connection of system side and wind farm side in power grid
Voltage and multiple harmonic currents.
It is appreciated that the data acquisition module 510 can execute above-mentioned steps S101.
The wind farm side harmonic current acquisition module 520 is for multiple harmonic voltages according to the points of common connection, institute
The harmonic impedance of the multiple harmonic currents and the preset wind farm side of stating points of common connection obtains the wind farm side
Multiple harmonic currents, wherein the harmonic impedance of the preset wind farm side passes through each element in the wind farm side
Parameter is calculated.
It is appreciated that the wind farm side harmonic current acquisition module 520 can execute above-mentioned steps S102.
The system side harmonic impedance acquisition module 530 is used for multiple harmonic voltages, described according to the points of common connection
The harmonic impedance of system side described in multiple harmonic currents of wind farm side and the compound linear regression equation calculation pre-established,
In, the harmonic voltage of the points of common connection is the explained variable of the compound linear regression equation pre-established, the wind
The harmonic current of electric field side is the explanatory variable of the compound linear regression equation pre-established.
It is appreciated that the system side harmonic impedance acquisition module 530 can execute above-mentioned steps S103.
As shown in Figure 10, which specifically includes the first regression coefficient computing module 531
With system side harmonic impedance computing module 532.
The first regression coefficient computing module 531 is used for multiple harmonic voltages, described according to the points of common connection
First regression coefficient described in multiple harmonic currents of wind farm side and the compound linear regression equation calculation pre-established.
It is appreciated that the first regression coefficient computing module 531 can execute above-mentioned steps S1031.
The system side harmonic impedance computing module 532 is used for according to first regression coefficient and the wind farm side
Harmonic impedance calculates the harmonic impedance of the system side.
It is appreciated that the system side harmonic impedance computing module 532 can execute above-mentioned steps S1032.
The harmonic voltage transmission level acquisition module 540 is for the harmonic impedance according to the system side, the public company
The harmonic impedance of multiple harmonic voltages of contact, multiple harmonic currents of the points of common connection and the wind farm side obtains
The harmonic voltage transmission level of the wind farm side.
As shown in figure 11, which specifically may include harmonic voltage transmission level meter
Calculate module 541 and harmonic voltage transmission level determining module 542.
The harmonic voltage transmission level computing module 541 is used for the harmonic impedance, described public according to the system side
The harmonic impedance of multiple harmonic voltages of tie point, multiple harmonic currents of the points of common connection and the wind farm side obtains
To multiple harmonic voltage transmission levels of the wind farm side.
It is appreciated that the harmonic voltage transmission level computing module 541 can execute above-mentioned steps S1041.
The harmonic voltage transmission level determining module 542 is used to emit water from multiple harmonic voltages of the wind farm side
Target harmonic voltage transmission level is determined in flat, and using the target harmonic voltage transmission level as the wind farm side
Harmonic voltage transmission level.
It is appreciated that the harmonic voltage transmission level determining module 542 can execute above-mentioned steps S1042.
Further, the harmonic voltage transmission level acquisition module 540 is additionally operable to according to the multiple of the wind farm side
Multiple harmonic voltages of harmonic voltage transmission level and the points of common connection obtain multiple harmonic voltages hair of the system side
Jetting is flat, and the harmonic voltage transmitting water of the system side is determined from multiple harmonic voltage transmission levels of the system side
It is flat.
It is appreciated that the harmonic voltage transmission level acquisition module 540 can execute above-mentioned steps S104 and step S105.
In conclusion harmonic voltage transmission level computational methods and device that the embodiment of the present invention is provided, pass through acquisition
Multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple harmonic currents in power grid, according to the public company
The harmonic wave of multiple harmonic voltages of contact, multiple harmonic currents of the points of common connection and the preset wind farm side hinders
It is anti-to obtain multiple harmonic currents of the wind farm side, wherein the harmonic impedance of the preset wind farm side passes through institute
Each component parameters stated in wind farm side are calculated, multiple harmonic voltages, the wind power plant according to the points of common connection
The harmonic impedance of system side described in multiple harmonic currents of side and the compound linear regression equation calculation pre-established, wherein institute
The harmonic voltage for stating points of common connection is the explained variable of the compound linear regression equation pre-established, the wind farm side
Harmonic current be the compound linear regression equation pre-established explanatory variable, according to the system side harmonic impedance,
Multiple harmonic voltages of the points of common connection, multiple harmonic currents of the points of common connection and the wind farm side it is humorous
Wave impedance obtains the harmonic voltage transmission level of the wind farm side.The application is computable using the harmonic impedance of wind farm side
Feature, calculates the harmonic current of the wind farm side unrelated with regression equation coefficient, establishes compound linear regression equation accordingly, to
The harmonic impedance of system side is calculated, the calculating for solving the harmonic impedance of system side in traditional regression method becomes in by regression equation
The deficiency that conllinear sexual factor influences between amount ensure that the accuracy that regression coefficient calculates；Also, the application is considering wind farm side
Harmonic impedance influence on the basis of calculate wind farm side harmonic voltage transmission level, calculate error smaller.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, apparatus, equipment or computer journey
Sequence product.Therefore, the embodiment of the present invention can be used complete hardware embodiment, complete software embodiment or combine software and hardware side
The form of the embodiment in face.Moreover, it wherein includes computer available programs that the embodiment of the present invention, which can be used in one or more,
Implement in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of code
The form of computer program product.
The embodiment of the present invention with reference to according to the method for the embodiment of the present invention, device, equipment and computer program product
Flowchart and/or the block diagram describes.It should be understood that can be realized by computer program instructions every in flowchart and/or the block diagram
The combination of flow and/or box in one flow and/or box and flowchart and/or the block diagram.These computers can be provided
Processor of the program instruction to all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
To generate a machine so that the instruction executed by computer or the processor of other programmable data processing devices generates use
In the dress for realizing the function of being specified in one flow of flow chart or multiple flows and/or one box of block diagram or multiple boxes
It sets.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
In several embodiments that the embodiment of the present invention is provided, it should be understood that disclosed device and method also may be used
To realize by another way.Device and method embodiment described above is only schematical, for example, in attached drawing
Flow chart and block diagram show the device of multiple embodiments according to the present invention, the possibility of method and computer program product is realized
Architecture, function and operation.In this regard, each box in flowchart or block diagram can represent module, a program
A part for a part for section or code, the module, section or code includes that one or more is patrolled for realizing defined
Collect the executable instruction of function.It should also be noted that at some as the function of in the realization method replaced, being marked in box
It can occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially be held substantially in parallel
Row, they can also be executed in the opposite order sometimes, this is depended on the functions involved.It is also noted that block diagram and/or
The combination of each box in flow chart and the box in block diagram and or flow chart can use function or dynamic as defined in executing
The dedicated hardware based system made is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each function module in each embodiment of the present invention can integrate to form an independent portion
Point, can also be modules individualism, can also two or more modules be integrated to form an independent part.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be expressed in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.It needs
Illustrate, herein, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment including a series of elements includes not only those elements, but also include not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited by sentence "including a ..." in the case of more limiting, it is not excluded that in the mistake for including the element
There is also other identical elements in journey, method, article or equipment.
The foregoing is merely the alternative embodiments of the present invention, are not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should be noted that：Similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and is explained.
Claims (10)
1. a kind of harmonic voltage transmission level computational methods, which is characterized in that the method includes：
Obtain multiple harmonic voltages of the points of common connection of system side and wind farm side and multiple harmonic currents in power grid；
According to multiple harmonic voltages of the points of common connection, multiple harmonic currents of the points of common connection and preset institute
The harmonic impedance for stating wind farm side obtains multiple harmonic currents of the wind farm side, wherein the preset wind power plant
The harmonic impedance of side is calculated by each component parameters in the wind farm side；
According to multiple harmonic voltages of the points of common connection, multiple harmonic currents of the wind farm side and pre-establish
The harmonic impedance of system side described in compound linear regression equation calculation, wherein the harmonic voltage of the points of common connection is described pre-
The harmonic current of the explained variable for the compound linear regression equation first established, the wind farm side is the multiple line pre-established
The explanatory variable of property regression equation；
According to the harmonic impedance of the system side, multiple harmonic voltages of the points of common connection, the points of common connection it is more
The harmonic impedance of a harmonic current and the wind farm side obtains the harmonic voltage transmission level of the wind farm side.
2. harmonic voltage transmission level computational methods as described in claim 1, which is characterized in that the compound linear regression equation
Including the first regression coefficient, multiple harmonic voltages according to the points of common connection, the points of common connection it is multiple humorous
The step of harmonic impedance of wave electric current and the preset wind farm side obtains multiple harmonic currents of the wind farm side is wrapped
It includes：
It described builds according to multiple harmonic voltages of the points of common connection, multiple harmonic currents of the wind farm side and in advance
First regression coefficient described in vertical compound linear regression equation calculation；
Harmonic impedance according to first regression coefficient and the wind farm side calculates the harmonic impedance of the system side.
3. harmonic voltage transmission level computational methods as claimed in claim 2, which is characterized in that the compound linear regression equation
For：Wherein,For the harmonic current of the wind farm side,For the points of common connection
Harmonic voltage, β1For first regression coefficient, β0For the second regression coefficient, ε is plural bias term；
The calculation formula of the harmonic impedance of the system side is：Wherein, ZCIt is hindered for the harmonic wave of the wind farm side
It is anti-, ZSFor the harmonic impedance of system side.
4. harmonic voltage transmission level computational methods as described in claim 1, which is characterized in that the harmonic wave of the wind farm side
The calculation formula of voltage discharge level is：
Wherein,For the harmonic voltage transmission level of the wind farm side,For the harmonic voltage of the points of common connection,For the harmonic current of the points of common connection, ZCFor the wind power plant
The harmonic impedance of side, ZSFor the harmonic impedance of system side.
5. harmonic voltage transmission level computational methods as described in claim 1, which is characterized in that the harmonic wave of the wind farm side
The calculation formula of electric current is：Wherein,For the harmonic current of the wind farm side,For
The harmonic voltage of the points of common connection,For the harmonic current of the points of common connection.
6. harmonic voltage transmission level computational methods as described in claim 1, which is characterized in that described according to the system side
Harmonic impedance, multiple harmonic voltages of the points of common connection, multiple harmonic currents of the points of common connection and described
The harmonic impedance of wind farm side obtains the step of harmonic voltage transmission level of the wind farm side and includes：
According to the harmonic impedance of the system side, multiple harmonic voltages of the points of common connection, the points of common connection it is more
The harmonic impedance of a harmonic current and the wind farm side obtains multiple harmonic voltage transmission levels of the wind farm side；
Target harmonic voltage transmission level is determined from multiple harmonic voltage transmission levels of the wind farm side, and will be described
Harmonic voltage transmission level of the target harmonic voltage transmission level as the wind farm side.
7. harmonic voltage transmission level computational methods as claimed in claim 6, which is characterized in that the method further includes：
It is obtained according to multiple harmonic voltage transmission levels of the wind farm side and multiple harmonic voltages of the points of common connection
Multiple harmonic voltage transmission levels of the system side determine institute from multiple harmonic voltage transmission levels of the system side
State the harmonic voltage transmission level of system side.
8. a kind of harmonic voltage transmission level computing device, which is characterized in that described device includes：
Data acquisition module, for obtaining in power grid multiple harmonic voltages of the points of common connection of system side and wind farm side and more
A harmonic current；
Wind farm side harmonic current acquisition module, for multiple harmonic voltages according to the points of common connection, the public company
The harmonic impedance of multiple harmonic currents of contact and the preset wind farm side obtains multiple harmonic waves of the wind farm side
Electric current, wherein the harmonic impedance of the preset wind farm side is calculated by each component parameters in the wind farm side
It obtains；
System side harmonic impedance acquisition module, for multiple harmonic voltages, the wind farm side according to the points of common connection
Multiple harmonic currents and the compound linear regression equation calculation that pre-establishes described in system side harmonic impedance, wherein it is described
The harmonic voltage of points of common connection is the explained variable of the compound linear regression equation pre-established, the wind farm side
Harmonic current is the explanatory variable of the compound linear regression equation pre-established；
Harmonic voltage transmission level acquisition module, for according to the harmonic impedance of the system side, the points of common connection it is more
The harmonic impedance of a harmonic voltage, multiple harmonic currents of the points of common connection and the wind farm side obtains the wind-powered electricity generation
The harmonic voltage transmission level of field side.
9. harmonic voltage transmission level computing device as claimed in claim 8, which is characterized in that the compound linear regression equation
Including the first regression coefficient, the system side harmonic impedance acquisition module includes：
First regression coefficient computing module, for according to multiple harmonic voltages of the points of common connection, the wind farm side
First regression coefficient described in multiple harmonic currents and the compound linear regression equation calculation pre-established；
System side harmonic impedance computing module, based on the harmonic impedance according to first regression coefficient and the wind farm side
Calculate the harmonic impedance of the system side.
10. harmonic voltage transmission level computing device as claimed in claim 8, which is characterized in that the harmonic voltage transmitting
Horizontal acquisition module includes：
Harmonic voltage transmission level computing module, for according to the harmonic impedance of the system side, the points of common connection it is more
The harmonic impedance of a harmonic voltage, multiple harmonic currents of the points of common connection and the wind farm side obtains the wind-powered electricity generation
Multiple harmonic voltage transmission levels of field side；
Harmonic voltage transmission level determining module, for being determined from multiple harmonic voltage transmission levels of the wind farm side
Target harmonic voltage transmission level, and sent out the target harmonic voltage transmission level as the harmonic voltage of the wind farm side
Jetting is flat.
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| CN114325107A (en) * | 2021-12-10 | 2022-04-12 | 国网西藏电力有限公司电力科学研究院 | Method for judging accuracy of harmonic impedance calculation result |
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