CN108205088A - A kind of parallel radio interference of high voltage ac/dc circuit calculates and optimization method - Google Patents
A kind of parallel radio interference of high voltage ac/dc circuit calculates and optimization method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/085—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning for detecting presence or location of electric lines or cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
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Abstract
A kind of present invention radio interference parallel for high voltage ac/dc circuit calculates and optimization method, according to the relevant information of existing actual high-voltage AC/DC parallel powerline, including AC line voltage grade, feeder number, DC circuit voltage grade, line construction etc. establishes the hybrid radio interference calculation model of two dimension；For input model parameter, when considering that alternating current-direct current influences each other, calculate the radio interference under ac and dc circuit influences each other respectively using empirical formula method and excitation function method, and it carries out geometric superposition and obtains the hybrid radio interference value of transmission line of electricity, at the same time, by the way that different line levels and the simultaneously hybrid radio interference calculation of row distance, screening obtains the optimization method of radio interference.The present invention reduces the radio interference intensity of high voltage ac/dc parallel powerline, achievees the purpose that optimize high voltage ac/dc parallel line electromagnetic environment.
Description
Technical field
The invention belongs to transmission line of electricity radio interference environmental evaluation technical field more particularly to a kind of high voltage ac/dc lines
The parallel radio interference in road calculates and optimization method.
Background technology
With the continuous construction of China's super-pressure and UHV transmission line, electric system national network, north and south intercommunication, west
The implementation of engineerings such as is sent in electric east, and the conveying pattern of China's power grid AC/DC parallel has basically formed.And the development of power grid so that defeated
Electric corridor is especially increasingly in short supply in developed area, and ac and dc circuit parallel laying is inevitable.And with alternating current-direct current
The appearance of parallel line, alternating current-direct current hybrid wireless electrical interference cause more and more concerns.
Domestic and foreign scholars and research institution find, in high voltage ac/dc parallel line, radio interference relatively exchanges
Different when circuit and DC line isolated operation, in AC/DC parallel, the corona discharge of each conducting wire has certain
Change, this influences the generation of this radio interference, and the radio interference superposition simultaneously between line space is apparent, so showing not
Situation during isolated operation is same as, hybrid radio interference prediction is difficult when this leads to AC/DC parallel.Radio is done at present
The research disturbed is main or the radio of alternating current circuit and DC line is studied respectively, for radio interference prediction
The data that research is mainly tested by summarizing corona cage obtain empirical equation.American Electric Power research institute (EPRI), the world
The radio interference committee (CISPR), Quebec water power research institute (IREQ), international bulk power grid (CIGRE) etc. also propose in succession
Oneself excitation function formula.Excitation function method tests to obtain excitation function also with corona cage, passes through corona current
It calculates, analyzes its communication process, the field strength of radio interference caused by finally obtaining corona current.Excitation function method is suitable for four
Division and above transmission line of electricity.The radio interference research of DC line is also seldom, the main warp still obtained based on experiment
Test equation.
By noted earlier, inventor has found, can calculate alternating current-direct current hybrid radio although research both domestic and external has and does
The method disturbed, mainly still calculates respectively, and the influence between alternating current circuit and DC line, Ran Houzai are had ignored in calculating process
Superposition, this so that the computational accuracy of AC/DC parallel circuit radio interference is short of, needs to be improved in these areas.
And with increase in demand of the China to transmission line of electricity, the hybrid wireless electrical interference of high voltage ac/dc parallel line is ground
Study carefully and be also required to further improve.At this point, the hybrid radio interference calculation parallel to high-voltage alternating circuit and DC line is ground
Study carefully just very necessary.
Invention content
Present invention seek to address that above problem of the prior art.Propose a kind of nothing for reducing high voltage ac/dc parallel line
The parallel hybrid radio interference calculation of the high voltage ac/dc circuit of line electrical interference and optimization method.Technical scheme of the present invention is such as
Under：
A kind of parallel radio interference of high voltage ac/dc circuit calculates and optimization method, includes the following steps：
A, according to the relevant information of existing actual high-voltage AC/DC parallel powerline, including AC line voltage grade,
Feeder number, DC circuit voltage grade and line construction establish the hybrid radio interference calculation model of two dimension；
B, the electricity of the hybrid radio interference calculation model established for step a, input AC circuit and DC line
The model parameters such as grade, line levels, and line space, split conductor number, split conductor radius are pressed, consider alternating current circuit and direct current
It is wireless under the influence of direct current when calculating exchange conducting wire division number less than 4 using empirical formula method under the influence of circuit is mutual
Electrical interference calculates the radio interference of alternating current circuit when division number is more than 4 under the influence of direct current with excitation function method, and uses experience
Equation calculates the radio interference of DC line.And carry out geometric superposition and obtain the hybrid radio interference value of transmission line of electricity,
At the same time, to different line levels and simultaneously row distance hybrid radio interference calculation；
C, in the calculating process of step b, the height of comparative analysis difference high voltage ac/dc circuit, spacing distance, mixing
Radio interference size, so as to obtain the optimization method for the radio interference intensity for reducing high voltage ac/dc parallel powerline,
Achieve the purpose that optimize high voltage ac/dc parallel line electromagnetic environment, the reconstruction for current transmission line of electricity provides reference.
Further, the relevant information of step a) the actual high-voltage AC/DC parallel powerlines is specially：It exchanges defeated
Electric line voltage class, DC power transmission line voltage class, conducting wire division spacing, conducting wire division number, sub-conductor radius, phase sequence row
Row, the line levels away from ground and ac and dc circuit and line space.
Further, the step b) empirical equations and excitation function are as follows：
1) it when the division number for exchanging conducting wire is less than or equal to 4, is calculated using empirical formula method
Using International Special Committee on Radio Interference recommended formula
E represents radio interference field strength, dB (μ V/m) in formula；R-wire radius, cm；D-observation point is transmitted electricity away from a certain phase
The distance of line, m；gmax- conductive line surfaces maximum potential gradient, kV/cm, what which calculated is 50% time probability under fair weather
Radio interference value can increase by 6~10dB (uV/m) for double 80% // 80% values by the value；
2) it when exchanging conducting wire division number more than 4, is calculated using excitation function method
EPRI-Electric Power Research Institute propose heavy rain situation under excitation function be specially：
Γ=70-585/gmax+35lgd-10lgn
In formula, gmaxFor the maximum potential gradient virtual value of conductive line surfaces, kV/cm；D be sub-conductor diameter, cm；N represents to divide
Split number of lead wires；
3) direct current radio interference calculates formula
The formula of radio interference value is calculated in bipolar direct current transmission line：
EdcFor the radio interference value calculated, dB, gmaxMaximum potential gradient kV/cm for conductive line surfaces；R is led for son
Line radius, cm；N is split conductor radical；D is to calculate distance of the point away from positive conductor, m；ΔEwFor meteorological correction item, with height above sea level
On the basis of 500m, increase 3.3dB per 1000m；ΔEfFor interfering frequency correction term, Δ Ef=5 (1-2 (lg (10f))2)；F is institute
The frequency that need to be calculated, MHz.
Further, the calculating of the hybrid radio interference value of transmission line of electricity specifically includes following step in the step b)
Suddenly：
1) first by alternating current circuit and DC line in same system, each conducting wire is calculated using Analogue charge method
Surface electric field intensity；
2) division number of exchange conducting wire is determined, if exchange number of lead wires is less than or equal to 4, formula carries out using exchanging experience
It calculates, if division number is more than 4, is calculated using excitation function method, obtain the radio interference value of exchange side, while root
The radio interference value being modified to according to standard under fine day；
3) DC side is calculated using direct current radio interference empirical equation, obtains the radio interference value under fine day；
4) the exchange radio interference value at point same below circuit and direct current radio interference value are carried out geometry to fold
Add, obtain hybrid radio interference value during fine day.
Further, line levels when meeting hybrid radio interference environment evaluation criterion are obtained and simultaneously line space is specific
For：When filtering out minimum hybrid radio interference strength, corresponding ac and dc circuit height and simultaneously line space.
Further, the line levels needs change, and row distance is in 60m- in line related construction criteria section
It is found between 120m.
Further, it is described to be specifically included by the way of geometric superposition：
Alternating current circuit with the same frequency that DC line generates is interfered and is added to obtain total interference level by quadratic sum：
The electric field unit of above formula is μ V/m, if unit is dB, (μ V/m) can be synthesized with following formula：
In formula, E be hybrid radio interference field strength, EacThe alternating current circuit radio interference field strength influenced to consider direct current,
EdcThe DC line radio interference field strength of branches affect is for consideration.
The parallel hybrid radio interference calculation of a kind of high-voltage alternating circuit and DC line based on the method and excellent
Change method system, the system comprises：
Computation model construction unit, for the relevant information of high voltage ac/dc parallel line, and according to the determining phase
Close information architecture computation model；
Line levels and simultaneously line space screening unit, simultaneously different line levels for transmission line of electricity and line space, profit
It is calculated, and be superimposed with the empirical equation or excitation function method of radio interference, obtains different line levels and simultaneously line space
Corresponding hybrid wireless electrical interference, and in the obtained different line levels and the simultaneously corresponding hybrid wireless electrical interference of line space
In, filter out the hybrid radio interference strength for meeting certain condition and its corresponding line levels and simultaneously line space；
Line levels and simultaneously line space revision unit, when meeting hybrid radio interference environment evaluation criterion for obtaining
Line levels and simultaneously line space, the reconstruction for current transmission line of electricity provide reference.
It advantages of the present invention and has the beneficial effect that：
In embodiments of the present invention, due to being directed to every a kind of line levels and simultaneously line space operation using the above scheme, sieve
The hybrid wireless electrical interference for meeting certain condition and its corresponding each line levels and simultaneously line space are selected, so as to reduce high pressure
The radio interference of AC/DC parallel circuit achievees the purpose that optimize AC/DC parallel circuit hybrid radio interference field strength.
Description of the drawings
Fig. 1 is that a kind of parallel radio interference of high voltage ac/dc circuit of present invention offer preferred embodiment offer calculates
And the whole implementation procedure chart of optimization method；
Fig. 2 is a kind of parallel radio interference calculating of high voltage ac/dc circuit provided in an embodiment of the present invention and optimization side
Method calculation flow chart；
Fig. 3 is a kind of parallel radio interference calculating of high voltage ac/dc circuit provided in an embodiment of the present invention and optimization side
Method measuring point and lead location schematic diagram；
Fig. 4 is a kind of parallel radio interference calculating of high voltage ac/dc circuit provided in an embodiment of the present invention and optimization side
Corona current propagates discrete circuitry schematic diagram in method
Fig. 5 is a kind of parallel radio interference calculating of high voltage ac/dc circuit provided in an embodiment of the present invention and optimization side
The computing system figure of method.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, detailed
Carefully describe.Described embodiment is only the part of the embodiment of the present invention.
The present invention solve above-mentioned technical problem technical solution be：
As shown in Figure 1, the radio interference parallel for a kind of high voltage ac/dc circuit calculates and the entirety of optimization method is real
Apply procedure chart：
Step 1, the relevant information for determining high voltage ac/dc parallel powerline, and two dimension mixing is built according to relevant information
Radio interference calculates model.
Detailed process is to determine the relevant information of high voltage ac/dc parallel powerline, including transmission line of alternation current voltage
Grade, DC power transmission line voltage class, conducting wire division spacing, conducting wire division number, sub-conductor radius, phase sequence arrange, away from ground
Line levels and ac and dc circuit and line space.
Step 2, the voltage class for corresponding high voltage ac/dc power delivery circuit, alternating current circuit and DC line spacer
From, using gridless routing to computation model carry out derivation, obtain high voltage ac/dc it is parallel when hybrid wireless electrical interference field
By force, and change line levels and simultaneously line space.The above method is calculated.
Detailed process is that the radio interference meter point counting is calculates the conducting wire under influencing each other in same system
Surface maximum potential gradient, then it is utilized respectively alternating current circuit and the calculation formula of DC line is calculated, then be superimposed.Described
Change line levels and simultaneously line space, line levels needs change in line related construction criteria section, and row distance need to be
It is found between 60m-120m.
Line levels when step 3, acquisition meet complex electrical field environmental evaluation standard and simultaneously line space, are current transmission of electricity
The reconstruction of circuit provides reference.
Detailed process is, the line levels when acquisition meets hybrid radio interference environment evaluation criterion and parallel
Spacing is：Filter out minimum hybrid radio interference strength and its corresponding ac and dc circuit height and simultaneously line space.
In embodiments of the present invention, main calculating of the invention is specific as follows：
The surface maximum potential gradient of I AC/DC parallel circuits calculates
Transmission line wire surface field intensity is the deciding factor that corona discharge phenomenon occurs for circuit.So power transmission line
The calculating of line conductor surface field intensity and bloom field strength is the necessary calculating before calculating circuit radio interference.
The surface maximum potential gradient that AC/DC parallel circuit is studied in same system is calculated using Analogue charge method,
Specific calculating step is as follows：
A) incoming line data, including transmission line of electricity voltage class, conducting wire division radius, conducting wire division number, sub-conductor half
Diameter, the position coordinates of each conducting wire.The equivalent redius of each conducting wire is calculated,
Wherein Ri is the equivalent redius of i-th conducting wire, and m, R are split conductor radius, and m, n are division number, and r is time conducting wire half
Diameter, m.
B) charge Q on each conducting wire is calculated by coefficient of potential method
In formula, PiiFor self-potential coefficient, PijIt is generated on i-th conducting wire match point for jth root conducting wire charge simulation
Referred to as coefficient of potential during potential value.The coefficient of potential passes throughIt calculates, wherein hiIt is
I root conducting wire distance away the grounds, RiFor conducting wire equivalent redius, LijFor i-th conducting wire to the distance of jth root conducting wire, L'ijIt is led for i-th
Line is to the distance of jth root image conductor.Qn is the charge simulation amount of n-th conducting wire,Current potential for n-th conducting wire.ε0It is true
Empty dielectric constant.
C) conductive line surfaces maximum field intensity is calculated
Wherein gmaxFor conductive line surfaces maximum field intensity, the charge simulation of kV/cm, Q for the conducting wire, ε0For vacuum dielectric
Constant, r are time wire radius, and cm, N are conducting wire division number, and R is conducting wire equivalent redius, cm.II considers the AC line that direct current influences
The radio interference on road calculates
By the calculating of the surface maximum potential gradient of AC/DC parallel circuit in I, AC line in same system is obtained
The surface maximum potential gradient of the conducting wire of road and DC line.
For the computational methods of transmission line of electricity radio interference, when the division number of conducting wire changes, radio is done
The computational methods for disturbing value have difference, there are mainly two types of：Empirical formula method and excitation function method.Empirical equation is divided in conducting wire
Number is 1~4, and working voltage is 200~750kV, when conductive line surfaces field strength is 12~20kV/cm, according to derived from measurement result.
The general radio interference for being suitable only for calculating ultra-high-tension power transmission line of the conducting wire division number no more than 4.And when split conductor number is big
When 4, generally use excitation function method calculates.
For the radio interference that exchange conducting wire generates, calculation process is as follows：
A) it when the division number for exchanging conducting wire is less than or equal to 4, is calculated using empirical formula method
Calculate the field per the 0.5MHz radio interferences mutually generated in certain point of single backcrossing stream overhead transmission line three-phase conducting wire
By force, China's power industry standard is using International Special Committee on Radio Interference (CISPR) recommended formula
E represents radio interference field strength, dB (μ V/m) in formula；R-wire radius, cm；D-observation point is transmitted electricity away from a certain phase
The distance of line, m；gmax- conductive line surfaces maximum potential gradient, kV/cm.What the formula calculated is 50% time probability under fair weather
Radio interference value can increase by 6~10dB (uV/m) for double 80% // 80% values by the value.
B) it when conducting wire division number is more than 4, is calculated using excitation function method
Excitation function method is to test to obtain excitation function by corona cage under the conditions of heavy rain, and determines the corona arteries and veins in conducting wire
Electric current is rushed, further according to Current calculation interference field strength level.Excitation function method is suitable for single time, more times, the exchange of arbitrary division number
Overhead transmission line is that a kind of comparatively ideal radio interference calculates method.
Excitation function under the heavy rain situation that EPRI-Electric Power Research Institute (EPRI) proposes is proper excitation function, tool
Body is：
Γ=70-585/gmax+35lgd-10lgn\*MERGEFORMAT(5)
In formula, gmaxFor the maximum potential gradient virtual value of conductive line surfaces, kV/cm；D be sub-conductor diameter, cm；N represents to divide
Split number of lead wires.National standard provides simultaneously, according to the Γ values to rain greatly, can obtain light rain and fair-weather excitation function, tool
Body relationship is：
ΓLight rain=ΓHeavy rain+δ0+δc\*MERGEFORMAT(6)
ΓFair weather=ΓHeavy rain-17\*MERGEFORMAT(7)
δ in formula0And δcFor the correction value under the conditions of calculating light rain during excitation function, can be determined by fair curve in standard.
When corona occurs for conducting wire, itself can flow through corona current, and electric current, three-phase line can be also induced on other phase conductors
On corona current can be acquired with excitation function, such as formula (1)
In formula：I is transmission line of electricity current matrix, and off diagonal element reflects three-phase current coupling；C is power transmission line
Road capacitance per unit length matrix, ε0For permittivity of vacuum；Γ is transmission line of electricity excitation function matrix.
1 aerial condutor can be represented with unit length series arrangement impedance Z and unit length parallel connection distribution admittance Y.
For electric current infinitesimal as shown in Figure 4, there is following relationship (v, i, x, respectively along line voltage, electric current, line length)：
By formula, second order differential equation can be obtained：
Formula is characteristic equation of the electric current along line propagation.
For three-phase line, i that can be directly in wushu changes three-phase current vector into, and Y, Z change corresponding matrix into, as a result
Still it sets up.Being multiplied by 1 phase mould transition matrix simultaneously to formula both sides makes former differential equation group become 3 independent differential equations,
Problem can be easy to solve.
If enter λ2For the diagonal matrix of the characteristic value generation by matrix YZ, S is corresponding eigenvectors matrix, then has λ2=
S-1YZS remembers i(m)=S-1I obtains (7) formula both sides and is multiplied by S together-1, obtain
By by the electric current that formula is calculated for people i0 (m)=S-1I with reference to boundary condition, solves Shi Ke get
Phase mould inverse transformation is done to the solution of formula, can obtain corona current propagation formula is：
I=Si(m)\*MERGEFORMAT(14)
After the corona current propagated on circuit is calculated, interference field strength is calculated in next step.As previously mentioned, radio is done
It disturbs mainly transmission line of electricity upstream and crosses the electromagnetic field formed during high frequency corona current in surrounding space.Current－carrying conductor highly for side
It is h in height1, horizontal coordinate is that the magnetic field intensity H and electric current i generated at the measuring point (as shown in Figure 3) of y meets
Electric field strength meets with magnetic field intensity
In formula：ε0For permittivity of vacuum；μ0Magnetic conductivity for air.
So radio interference intensity caused by the i-th phase conductor corona current infinitesimal is：
In formula：iji(x) it is i
The corona current that phase conductor generates；zj、yiThe respectively height and horizontal coordinate of jth phase conductor；
Assuming that whole uniform corona of conducting wire, then the radio interference field strength at measuring point is by formula (18) integration：
Radio interference level during each phase conductor corona can be calculated using model above, is closed by national standard
Into, you can obtain total radio interference of alternating current circuit generation.
III considers that the radio interference for the DC line that exchange influences calculates
The maximum potential gradient on DC line surface under the influence of considering to exchange is calculated in step 1.
It is calculated using the recommended formula of CISPR.
CISPR is deduced the formula that radio interference value is calculated in bipolar direct current transmission line in nineteen eighty-two：
EdcFor the direct current radio interference value calculated, dB.gmaxMaximum potential gradient kV/cm for conductive line surfaces；R is
Sub-conductor radius, cm；N is split conductor radical；D is to calculate distance of the point away from positive conductor, m；ΔEwFor meteorological correction item, with sea
On the basis of pulling out 500m, increase 3.3dB per 1000m；ΔEfFor interfering frequency correction term, Δ Ef=5 (1-2 (lg (10f))2)；F is
The frequency of required calculating, MHz.
The calculating of IV hybrid wireless electrical interference
It is superimposed the radio interference of ac and dc circuit.
After the radio interference for calculating ac and dc circuit respectively, synthesize as follows.Synthesis principle is to try to ensure
Interference value after synthesis is identical with using the measured value of CISPR standard interference meters, that is, is contemplated that the spy of peak detector
Property.Therefore, the mode that geometric superposition is employed herein carries out.
The radio interference that this method may be considered ac and dc circuit generation is random, and both sides relation coefficient is
Zero, alternating current circuit with the same frequency that DC line generates is interfered and is added to obtain total interference level by quadratic sum：
The electric field unit of above formula is μ V/m.If unit is dB, (μ V/m) can be synthesized with following formula：
In formula, E be hybrid radio interference field strength, EacThe alternating current circuit radio interference field strength influenced to consider direct current,
EdcThe DC line radio interference field strength of branches affect is for consideration.
Line levels when step 3, acquisition meet complex electrical field environmental evaluation standard and simultaneously line space, are current transmission of electricity
The reconstruction of circuit provides reference.
Detailed process is, to changing line levels in step 2 and simultaneously computation method calculates mixing nothing to line space repeatedly
Line electrical interference, the line levels obtained corresponding to smaller hybrid wireless electrical interference and circuit and line space of screening, to reach
The reconstruction of transmission line of electricity provides the purpose of reference.
As shown in figure 4, the radio interference meter that a kind of high voltage ac/dc circuit in the embodiment of the present invention, to provide is parallel
Calculation and optimization method system, the system comprises：
Computation model construction unit 210, for the relevant information of high voltage ac/dc parallel line, and according to described determining
Relevant information builds computation model；
Line levels and simultaneously line space screening unit 220, different line levels for transmission line of electricity and simultaneously line space,
It is calculated, and be superimposed using the empirical equation or excitation function method of radio interference, obtains different line levels and simultaneously in the ranks
Away from corresponding hybrid wireless electrical interference, and in the obtained different line levels and simultaneously the corresponding hybrid radio of line space is done
In disturbing, the hybrid radio interference strength for meeting certain condition and its corresponding line levels and simultaneously line space are filtered out；
Line levels and simultaneously line space revision unit 230, meet hybrid radio interference environment evaluation criterion for obtaining
When line levels and simultaneously line space, the reconstruction for current transmission line of electricity provide reference.
It is worth noting that, in above system embodiment, included each system unit only according to function logic into
What row divided, but above-mentioned division is not limited to, as long as corresponding function can be realized；In addition, each functional unit
Specific name is also only to facilitate mutually distinguish, the protection domain being not intended to restrict the invention.
One of ordinary skill in the art will appreciate that all or part of the steps of the method in the foregoing embodiments are can be with
Relevant hardware is instructed to complete by program, the program can be stored in a computer read/write memory medium,
The storage medium, such as ROM/RAM, disk, CD.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.
After the content for having read the record of the present invention, technical staff can make various changes or modifications the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (8)
1. a kind of parallel radio interference of high voltage ac/dc circuit calculates and optimization method, which is characterized in that including following step
Suddenly：
A, according to the relevant information of existing actual high-voltage AC/DC parallel powerline, including AC line voltage grade, circuit
Number, DC circuit voltage grade and line construction establish the hybrid radio interference calculation model of two dimension；
B, voltage of the hybrid radio interference calculation model established for step a, input AC circuit and DC line etc.
Grade, line levels, and line space, split conductor number, the model parameter including split conductor radius consider alternating current circuit and direct current
It is wireless under the influence of direct current when calculating exchange conducting wire division number less than 4 using empirical formula method under the influence of circuit is mutual
Electrical interference and the radio interference that alternating current circuit when division number is more than 4 under the influence of direct current is calculated using excitation function method, are used in combination
Empirical formula method calculates the radio interference of DC line, and carries out geometric superposition and obtain the hybrid wireless electrical interference of transmission line of electricity
Value, at the same time, to different line levels and the simultaneously hybrid radio interference calculation of row distance；
C, in the calculating process of step b, the height of comparative analysis difference high voltage ac/dc circuit, spacing distance, hybrid wireless
Electrical interference size so as to obtain the optimization method for the radio interference intensity for reducing high voltage ac/dc parallel powerline, reaches
Optimize the purpose of high voltage ac/dc parallel line electromagnetic environment, the reconstruction for current transmission line of electricity provides reference.
2. the parallel hybrid radio interference calculation of high voltage ac/dc circuit according to claim 1 and optimization method,
It is characterized in that, the relevant information of step a) the actual high-voltage AC/DC parallel powerlines is specially：Transmission line of alternation current electricity
Grade, DC power transmission line voltage class, conducting wire division spacing, conducting wire division number, sub-conductor radius, phase sequence is pressed to arrange, away from ground
Line levels and ac and dc circuit and line space.
3. the parallel hybrid radio interference calculation of high voltage ac/dc circuit according to claim 1 and optimization method,
It is characterized in that, the step b) empirical equations and excitation function are as follows：
1) it when the division number for exchanging conducting wire is less than or equal to 4, is calculated using empirical formula method
Using International Special Committee on Radio Interference recommended formula
E represents radio interference field strength, dB (μ V/m) in formula；R-wire radius, cm；D-observation point is away from a certain phase power transmission line
Distance, m；gmax- conductive line surfaces maximum potential gradient, kV/cm, what which calculated is the wireless of 50% time probability under fair weather
Electrical interference value can increase by 6~10dB (uV/m) for double 80% // 80% values by the value；
2) it when exchanging conducting wire division number more than 4, is calculated using excitation function method
EPRI-Electric Power Research Institute propose heavy rain situation under excitation function be specially：
Γ=70-585/gmax+35lgd-10lgn
In formula, gmaxFor the maximum potential gradient virtual value of conductive line surfaces, kV/cm；D be sub-conductor diameter, cm；N represents that division is led
Line number；
3) direct current radio interference calculates formula
The formula of radio interference value is calculated in bipolar direct current transmission line：
EdcFor the radio interference value calculated, dB, gmaxMaximum potential gradient kV/cm for conductive line surfaces；R is sub-conductor half
Diameter, cm；N is split conductor radical；D is to calculate distance of the point away from positive conductor, m；ΔEwFor meteorological correction item, using height above sea level 500m as
Benchmark increases 3.3dB per 1000m；ΔEfFor interfering frequency correction term, Δ Ef=5 (1-2 (lg (10f))2)；F is required calculating
Frequency, MHz.
4. the parallel radio interference of high voltage ac/dc circuit according to claim 3 calculates and optimization method, feature
Be, in the step b) calculating of the hybrid radio interference value of transmission line of electricity specifically include following steps：
1) surface of each conducting wire is calculated using Analogue charge method in same system first by alternating current circuit and DC line
Field strength；
2) division number of exchange conducting wire is determined, if exchange number of lead wires is less than or equal to 4, formula is counted using exchanging experience
It calculates, if division number is more than 4, is calculated using excitation function method, obtain the radio interference value of exchange side, while basis
Standard is modified to the radio interference value under fine day；
3) DC side is calculated using direct current radio interference empirical equation, obtains the radio interference value under fine day；
4) the exchange radio interference value at point same below circuit and direct current radio interference value are subjected to geometric superposition, obtained
To hybrid radio interference value during fine day.
5. the parallel hybrid radio interference calculation of high voltage ac/dc circuit according to claim 3 and optimization method,
It is characterized in that, obtains line levels when meeting hybrid radio interference environment evaluation criterion and simultaneously line space is specially：Screening
When going out minimum hybrid radio interference strength, corresponding ac and dc circuit height and simultaneously line space.
6. the parallel hybrid radio interference calculation of high voltage ac/dc circuit according to claim 5 and optimization method,
It is characterized in that, the line levels needs change, and row distance is between 60m-120m in line related construction criteria section
It finds.
7. the parallel hybrid radio interference calculation of high voltage ac/dc circuit according to claim 3 and optimization method,
It is characterized in that, it is described to be specifically included by the way of geometric superposition：
Alternating current circuit with the same frequency that DC line generates is interfered and is added to obtain total interference level by quadratic sum：
The electric field unit of above formula is μ V/m, if unit is dB, (μ V/m) can be synthesized with following formula：
In formula, E be hybrid radio interference field strength, EacThe alternating current circuit radio interference field strength influenced to consider direct current, EdcFor
The DC line radio interference field strength of branches affect is in consideration.
8. the parallel hybrid wireless electrical interference meter of a kind of high-voltage alternating circuit and DC line based on claim 7 the method
Calculation and optimization method system, the system comprises：
Computation model construction unit, for the relevant information of high voltage ac/dc parallel line, and according to the determining related letter
Breath structure computation model；
Line levels and simultaneously line space screening unit, simultaneously different line levels for transmission line of electricity and line space, utilize nothing
The empirical equation or excitation function method of line electrical interference are calculated, and be superimposed, and obtain different line levels and simultaneously line space corresponds to
Hybrid wireless electrical interference, and in the obtained different line levels and the simultaneously corresponding hybrid wireless electrical interference of line space,
Filter out the hybrid radio interference strength for meeting certain condition and its corresponding line levels and simultaneously line space；
Line levels and simultaneously line space revision unit, circuit during hybrid radio interference environment evaluation criterion is met for obtaining
Highly and simultaneously line space, the reconstruction for current transmission line of electricity provide reference.
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