CN112217212A - High-pass damping filter and method for suppressing non-characteristic harmonic resonance - Google Patents
High-pass damping filter and method for suppressing non-characteristic harmonic resonance Download PDFInfo
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Abstract
The invention discloses a high-pass damping filter and a method for inhibiting non-characteristic harmonic resonance, wherein the high-pass damping filter comprises a capacitor C1, one end of the capacitor C1 is used as an interface end of the high-pass damping filter, and the other end of the capacitor C1 is respectively connected with one end of an inductor L2 and one end of a switch K through an inductor L1; the other end of the switch K is connected with one end of the resistor R through a capacitor C2; the other end of the resistor R is connected with the other end of the inductor L2 and is grounded. The high-pass damping filter can simultaneously realize characteristic and non-characteristic subharmonic resonance suppression, and the power loss of the high-pass damping filter can be reduced by controlling the on-off of the switch K. Switch K is disconnected under some system conditions, so that the damping branch circuit can be prevented from operating for a long time, the heating of the resistor is reduced, the service life of the equipment is prolonged, and the economic operation of the transformer substation is realized.
Description
Technical Field
The invention relates to the field of power transmission, in particular to a high-pass damping filter and a method for inhibiting non-characteristic harmonic resonance.
Background
The converter station is a station established in a high-voltage direct-current transmission system for converting alternating current into direct current or converting direct current into alternating current and meeting the requirements of a power system on safety, stability and power quality. High voltage direct current transmission is widely applied to power grid interconnection due to the superior performance of the high voltage direct current transmission in the aspect of long-distance large-capacity power transmission. However, the inherent non-linear characteristics of the inverter cause it to generate a large number of harmonics. Such as a 12-pulse inverter, generates a large number of 12k + -1 harmonics, which are also referred to as characteristic subharmonics, with the remaining harmonics being non-characteristic subharmonics. Most converter stations are equipped with characteristic subharmonic filters, whereas the non-characteristic harmonics are not of interest. Many situations that non-characteristic harmonic waves exceed standards exist in a converter station, and the existing solution technologies mainly include two types:
firstly, a single-tuned filter is additionally installed, but overcompensation can be caused under the condition of light load;
secondly, a high-pass damping filter is added, but the filter structure proposed at present can cause larger power loss.
Disclosure of Invention
Aiming at the defects in the prior art, the high-pass damping filter and the method for inhibiting the non-characteristic harmonic resonance provided by the invention solve the problem that the existing high-pass damping filter is easy to cause larger power loss when inhibiting the non-characteristic harmonic resonance.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the high-pass damping filter for inhibiting the non-characteristic harmonic resonance comprises a capacitor C1, wherein one end of the capacitor C1 is used as an interface end of the high-pass damping filter, and the other end of the capacitor C1 is connected with one end of an inductor L2 and one end of a switch K through an inductor L1; the other end of the switch K is connected with one end of the resistor R through a capacitor C2; the other end of the resistor R is connected with the other end of the inductor L2 and is grounded.
A method for suppressing non-characteristic harmonic resonances is provided, comprising the steps of:
s1, acquiring the number N of double-tuned filters in the target converter station, and replacing one of the double-tuned filters with a high-pass damping filter;
s2, obtaining parameters of a high-pass damping filter for replacing the double-tuned filter;
s3, respectively acquiring the maximum harmonic voltage which possibly appears at the parallel connection point of the filter when the target converter station is put into 1-N filters according to the parameters of the double-tuned filter and the parameters of the high-pass damping filter in the target converter station; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s4, acquiring the input number of the filters corresponding to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, wherein the maximum harmonic voltage possibly occurring at the parallel connection point of the filters is less than or equal to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, and acquiring a number set;
and S5, judging whether the number of the double-tuned filters which are currently put into operation in the target converter station is in the number set, if so, switching off a switch K in the high-pass damping filter, and otherwise, keeping the switch K in the high-pass damping filter on.
Further, the specific method of step S2 includes the following sub-steps:
s2-1, according to the formula:
obtaining capacitance value C of capacitor C1 in high-pass damping filter1(ii) a Wherein QFThe reactive compensation demand for the power grid; omega1Is the fundamental angular frequency; u shaperRated voltage is connected with the parallel point of the filter;
s2-2, adjusting the first tuning frequency omegatTaking the value of 11 th harmonic, i.e. omegat＝11ω1(ii) a The second tuning frequency omegapTaking the value of 6 harmonics, i.e. omegap＝6ω1(ii) a Presetting a first tuning frequency omegatA harmonic amplification limit of A; presetting a second tuning frequency omegapThe minimum value B of the harmonic amplification coefficient; the inductance value of the inductor L2 is preset to be within a value range [ L2 ]min,L2max]And the value range of resistance of the resistor R [ R ]min,Rmax]；
S2-3, converting the inductance L of the inductor L2 to the inductance L2From L2minStarting to take values;
s2-4, changing the resistance R of the resistor R from RminStarting to take values;
s2-5, respectively according to the formula:
obtaining inductance value L of inductor L11And the capacitance value C of the capacitor C22；
S2-6, according to the formula:
ZDHP(ω)＝1/(jωC1)+jωL1+(jωL1)//(1/(jωC2)+R) 5ω1≤ω≤25ω1
obtaining a value Z of a harmonic impedance of a high-pass damping filterDHP(ω); wherein j is an imaginary number;
s2-7, according to the formula:
obtaining and judging harmonic amplification factor HAR (omega) at first tuning frequencyt) If the value is less than or equal to A%, the step S2-8 is executed, otherwise, the step S2-10 is executed; wherein ZDHP(ωt) For high-pass damping filters in ω - ωtHarmonic impedance of (Z)DHP(ωt)∈ZDHP(ω)；ZS(ωt) For systems at a first tuning frequency omegatThe harmonic impedance of (a), the value of which is measured before the high-pass damping filter is installed;
s2-8, according to the formula:
at other frequenciesHAR of the most severe harmonic amplification factorworst(ω); n is the total number of filters configured in the target converter station; zFi(ω) is the total harmonic impedance of the filter bank when i double tuned filters are put into use;
s2-9, judging HARworstIf (omega) is less than the value B, if so, updating the value B to HARworst(ω), and record the current capacitance value of the capacitor C1, the capacitance value of the capacitor C2, the inductance value of the inductor L1, the inductance value of the inductor L2, and the resistance value of the resistor R, and go to step S2-10; otherwise, directly entering step S2-10;
s2-10, judging whether the resistance value of the current resistor R is smaller than RmaxIf yes, adding 0.1 to the resistance value of the current resistor R and returning to the step S2-5; otherwise, entering step S2-11;
s2-11, judging whether the inductance value of the current inductor L2 is less than L2maxIf yes, adding 0.001 to the inductance value of the current inductor L2 and returning to the step S2-4; otherwise, outputting the latest parameter value recorded in the step S2-9, and finishing the parameter acquisition of the high-pass damping filter.
Further, the first tuning frequency ωtThe harmonic amplification limit a has a value of 0.3.
Further, a second tuning frequency ωpThe harmonic amplification factor minimum B has a value of 3.
Further, the specific method of step S3 includes the following sub-steps:
s3-1, according to the formula:
Z'DHP(ω)＝1/(jωC1)+jωL1+jωL2
obtaining harmonic impedance Z 'after switch K of high-pass damping filter is disconnected'DHP(ω); wherein j represents an imaginary number; ω represents angular frequency; c1Represents the capacitance value of the capacitance C1; l is1Represents the inductance value of the inductance L1; l is2Represents the inductance value of the inductance L2;
s3-2, obtaining harmonic impedance Z of the double-tuned filter according to parameters of the double-tuned filter in the target converter stationother(ω)；
S3-3, according to the formula:
Z'Fi(ω)＝Z'DHP(ω)//Zother(ω)＝(1/(jωC1)+jωL1+jωL2)//Zother(ω)
obtaining equivalent harmonic impedance Z 'of the whole filter bank after the target converter station puts in i double-tuned filters and the high-pass damping filter switch K is disconnected'Fi(ω); where// represents parallel; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s3-4, obtaining the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)；
S3-5, according to the formula:
obtaining the maximum harmonic voltage U which may appear at the parallel connection point of the filters when the target converter station puts in 1-N filtersFimax(ω); wherein ZS-LeftAnd (ω) is the leftmost boundary value of the system harmonic impedance represented by the polygonal region.
Further, the specific method of step S3-4 includes the following sub-steps:
s3-4-1, obtaining the maximum value of the system background harmonic voltage when the double-tuned filter in the target converter station is not replaced by the high-pass damping filter, namely the maximum value U of the original system background harmonic voltageS(ω)；
S3-4-2, replacing one double-tuned filter in the target converter station with a high-pass damping filter, and according to the formula:
obtaining the harmonic impedance of the whole double-tuned filter bank from Z when a certain double-tuned filter in the current filter bank is switched on or switched offF1(ω) to ZF2(omega) parallel point voltage is represented by UF1(omega) to UF2Background harmonic voltage value U 'at (omega)'S(ω)；
S3-4-3, obtaining and judging the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) is greater than or equal to the maximum value U of the background harmonic voltage of the original systemS(ω), if so, the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω), otherwise the original system background harmonic voltage maximum US(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)。
The invention has the beneficial effects that: the high-pass damping filter can simultaneously realize characteristic and non-characteristic subharmonic resonance suppression, and the power loss of the high-pass damping filter can be reduced by controlling the on-off of the switch K. Switch K is disconnected under some system conditions, so that the damping branch circuit can be prevented from operating for a long time, the heating of the resistor is reduced, the service life of the equipment is prolonged, and the economic operation of the transformer substation is realized.
Drawings
FIG. 1 is a schematic structural diagram of the high-pass damping filter;
fig. 2 is a schematic diagram of harmonic variation of parallel points before and after switching of a filter.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the high-pass damping filter for suppressing non-characteristic harmonic resonance comprises a capacitor C1, one end of the capacitor C1 serves as an interface end of the high-pass damping filter, and the other end of the capacitor C1 is connected to one end of an inductor L2 and one end of a switch K through an inductor L1; the other end of the switch K is connected with one end of the resistor R through a capacitor C2; the other end of the resistor R is connected with the other end of the inductor L2 and is grounded.
The method for suppressing non-characteristic harmonic resonance comprises the following steps:
s1, acquiring the number N of double-tuned filters in the target converter station, and replacing one of the double-tuned filters with a high-pass damping filter;
s2, obtaining parameters of a high-pass damping filter for replacing the double-tuned filter;
s3, respectively acquiring the maximum harmonic voltage which possibly appears at the parallel connection point of the filter when the target converter station is put into 1-N filters according to the parameters of the double-tuned filter and the parameters of the high-pass damping filter in the target converter station; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s4, acquiring the input number of the filters corresponding to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, wherein the maximum harmonic voltage possibly occurring at the parallel connection point of the filters is less than or equal to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, and acquiring a number set;
and S5, judging whether the number of the double-tuned filters which are currently put into operation in the target converter station is in the number set, if so, switching off a switch K in the high-pass damping filter, and otherwise, keeping the switch K in the high-pass damping filter on.
The specific method of step S2 includes the following substeps:
s2-1, according to the formula:
obtaining capacitance value C of capacitor C1 in high-pass damping filter1(ii) a Wherein QFThe reactive compensation demand for the power grid; omega1Is the fundamental angular frequency; u shaperRated voltage is connected with the parallel point of the filter;
s2-2, adjusting the first tuning frequency omegatTaking the value of 11 th harmonic, i.e. omegat＝11ω1(ii) a The second tuning frequency omegapTaking the value of 6 harmonics, i.e. omegap＝6ω1(ii) a Presetting a first tuning frequencyωtA harmonic amplification limit of A; presetting a second tuning frequency omegapThe minimum value B of the harmonic amplification coefficient; the inductance value of the inductor L2 is preset to be within a value range [ L2 ]min,L2max]And the value range of resistance of the resistor R [ R ]min,Rmax]；
S2-3, converting the inductance L of the inductor L2 to the inductance L2From L2minStarting to take values;
s2-4, changing the resistance R of the resistor R from RminStarting to take values;
s2-5, respectively according to the formula:
obtaining inductance value L of inductor L11And the capacitance value C of the capacitor C22；
S2-6, according to the formula:
ZDHP(ω)＝1/(jωC1)+jωL1+(jωL1)//(1/(jωC2)+R) 5ω1≤ω≤25ω1
obtaining a value Z of a harmonic impedance of a high-pass damping filterDHP(ω); wherein j is an imaginary number;
s2-7, according to the formula:
obtaining and judging harmonic amplification factor HAR (omega) at first tuning frequencyt) If the value is less than or equal to A%, the step S2-8 is executed, otherwise, the step S2-10 is executed; wherein ZDHP(ωt) For high-pass damping filters in ω - ωtHarmonic impedance of (Z)DHP(ωt)∈ZDHP(ω)；ZS(ωt) For systems at a first tuning frequency omegatThe harmonic impedance of (a), the value of which is measured before the high-pass damping filter is installed;
s2-8, according to the formula:
obtaining the most severe harmonic amplification factor HAR at other frequenciesworst(ω); n is the total number of filters configured in the target converter station; zFi(ω) is the total harmonic impedance of the filter bank when i double tuned filters are put into use;
s2-9, judging HARworstIf (omega) is less than the value B, if so, updating the value B to HARworst(ω), and record the current capacitance value of the capacitor C1, the capacitance value of the capacitor C2, the inductance value of the inductor L1, the inductance value of the inductor L2, and the resistance value of the resistor R, and go to step S2-10; otherwise, directly entering step S2-10;
s2-10, judging whether the resistance value of the current resistor R is smaller than RmaxIf yes, adding 0.1 to the resistance value of the current resistor R and returning to the step S2-5; otherwise, entering step S2-11;
s2-11, judging whether the inductance value of the current inductor L2 is less than L2maxIf yes, adding 0.001 to the inductance value of the current inductor L2 and returning to the step S2-4; otherwise, outputting the latest parameter value recorded in the step S2-9, and finishing the parameter acquisition of the high-pass damping filter.
First tuning frequency omegatThe harmonic amplification limit a has a value of 0.3. Second tuning frequency omegapThe harmonic amplification factor minimum B has a value of 3.
The specific method of step S3 includes the following substeps:
s3-1, according to the formula:
Z'DHP(ω)＝1/(jωC1)+jωL1+jωL2
obtaining harmonic impedance Z 'after switch K of high-pass damping filter is disconnected'DHP(ω); wherein j represents an imaginary number; ω represents angular frequency; c1Represents the capacitance value of the capacitance C1; l is1Represents the inductance value of the inductance L1;L2represents the inductance value of the inductance L2;
s3-2, obtaining harmonic impedance Z of the double-tuned filter according to parameters of the double-tuned filter in the target converter stationother(ω)；
S3-3, according to the formula:
Z'Fi(ω)＝Z'DHP(ω)//Zother(ω)＝(1/(jωC1)+jωL1+jωL2)//Zother(ω)
obtaining equivalent harmonic impedance Z 'of the whole filter bank after the target converter station puts in i double-tuned filters and the high-pass damping filter switch K is disconnected'Fi(ω); where// represents parallel; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s3-4, obtaining the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)；
S3-5, according to the formula:
obtaining the maximum harmonic voltage U which may appear at the parallel connection point of the filters when the target converter station puts in 1-N filtersFimax(ω); wherein ZS-LeftAnd (ω) is the leftmost boundary value of the system harmonic impedance represented by the polygonal region.
As shown in fig. 2, the specific method of step S3-4 includes the following sub-steps:
s3-4-1, obtaining the maximum value of the system background harmonic voltage when the double-tuned filter in the target converter station is not replaced by the high-pass damping filter, namely the maximum value U of the original system background harmonic voltageS(ω)；
S3-4-2, replacing one double-tuned filter in the target converter station with a high-pass damping filter, and according to the formula:
obtaining the harmonic impedance of the whole double-tuned filter bank from Z when a certain double-tuned filter in the current filter bank is switched on or switched offF1(ω) to ZF2(omega) parallel point voltage is represented by UF1(omega) to UF2Background harmonic voltage value U 'at (omega)'S(ω)；
S3-4-3, obtaining and judging the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) is greater than or equal to the maximum value U of the background harmonic voltage of the original systemS(ω), if so, the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω), otherwise the original system background harmonic voltage maximum US(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)。
In an embodiment of the present invention, for an actual converter station with 9 12/24 double-tuned filters, a double-tuned filter is modified into the high-pass damping filter proposed by the present invention, and specific values of parameters of the high-pass damping filter are shown in table 1.
Table 1: filter parameters
And calculating the maximum harmonic voltage which is possibly generated at the parallel connection points of the filters under the condition that the input number of the filters is 1-9 according to the steps, wherein the maximum harmonic voltage is shown in a table 2. As can be seen from table 2, when the number of filters put into operation is greater than or equal to 7, the maximum harmonic voltage that may occur at the parallel point of the filters is less than or equal to the product of the rated voltage at the parallel point of the filters and the harmonic distortion rate limit value, that is, the switches K of the high-pass damping filters can be turned off when 7, 8, and 9 filters are put into operation in the system.
Table 2: maximum harmonic voltage possibly appearing at parallel points under the condition of different filter input numbers
In table 2, X represents the product of the tie point rated voltage and the harmonic distortion limit; 5thDenotes the 5 th harmonic, 7thDenotes the 7 th harmonic, 11thDenotes the 11 th harmonic, 13thDenotes the 13 th harmonic, 23rdRepresenting 23 th harmonic, 25thRepresenting the 25 th harmonic.
On the basis of the embodiment, further power calculation is performed, and when the input number of the filters is greater than 6, that is, the switches K can be opened, the voltage, the current and the power of each element of the high-pass damping filter and the original double-tuned filter of the converter station are on and off, as shown in table 3.
Table 3: filter voltage current and power values under different switch states
As can be seen from table 3, the high-pass damping filter and the method provided by the present invention can reduce the active loss of about 100kW, and according to the actual operation data of the converter station, about 43% of the time is put into operation for 7-9 filters, so that about 7MW of active loss can be reduced in one week.
In summary, the high-pass damping filter of the present invention can simultaneously achieve characteristic and non-characteristic sub-harmonic resonance suppression, and the power loss of the high-pass damping filter can be reduced by controlling the on/off of the switch K. Switch K is disconnected under some system conditions, so that the damping branch circuit can be prevented from operating for a long time, the heating of the resistor is reduced, the service life of the equipment is prolonged, and the economic operation of the transformer substation is realized.
Claims (7)
1. A high-pass damping filter for suppressing non-characteristic harmonic resonance is characterized by comprising a capacitor C1, wherein one end of the capacitor C1 is used as an interface end of the high-pass damping filter, and the other end of the capacitor C1 is connected with one end of an inductor L2 and one end of a switch K through an inductor L1; the other end of the switch K is connected with one end of the resistor R through a capacitor C2; the other end of the resistor R is connected with the other end of the inductor L2 and is grounded.
2. A method for suppressing an uncharacteristic harmonic resonance, comprising the steps of:
s1, acquiring the number N of double-tuned filters in the target converter station, and replacing one of the double-tuned filters with a high-pass damping filter;
s2, obtaining parameters of a high-pass damping filter for replacing the double-tuned filter;
s3, respectively acquiring the maximum harmonic voltage which possibly appears at the parallel connection point of the filter when the target converter station is put into 1-N filters according to the parameters of the double-tuned filter and the parameters of the high-pass damping filter in the target converter station; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s4, acquiring the input number of the filters corresponding to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, wherein the maximum harmonic voltage possibly occurring at the parallel connection point of the filters is less than or equal to the product of the rated voltage of the parallel connection point of the filters and the harmonic distortion rate limit value, and acquiring a number set;
and S5, judging whether the number of the double-tuned filters which are currently put into operation in the target converter station is in the number set, if so, switching off a switch K in the high-pass damping filter, and otherwise, keeping the switch K in the high-pass damping filter on.
3. The method for suppressing non-characteristic harmonic resonance according to claim 2, wherein the specific method of the step S2 includes the following sub-steps:
s2-1, according to the formula:
obtaining capacitance value C of capacitor C1 in high-pass damping filter1(ii) a Wherein QFThe reactive compensation demand for the power grid; omega1Is the fundamental angular frequency; u shaperRated voltage is connected with the parallel point of the filter;
s2-2, adjusting the first tuning frequency omegatTaking the value of 11 th harmonic, i.e. omegat＝11ω1(ii) a The second tuning frequency omegapTaking the value of 6 harmonics, i.e. omegap＝6ω1(ii) a Presetting a first tuning frequency omegatA harmonic amplification limit of A; presetting a second tuning frequency omegapThe minimum value B of the harmonic amplification coefficient; the inductance value of the inductor L2 is preset to be within a value range [ L2 ]min,L2max]And the value range of resistance of the resistor R [ R ]min,Rmax]；
S2-3, converting the inductance L of the inductor L2 to the inductance L2From L2minStarting to take values;
s2-4, changing the resistance R of the resistor R from RminStarting to take values;
s2-5, respectively according to the formula:
obtaining inductance value L of inductor L11And the capacitance value C of the capacitor C22；
S2-6, according to the formula:
ZDHP(ω)＝1/(jωC1)+jωL1+(jωL1)//(1/(jωC2)+R) 5ω1≤ω≤25ω1
obtaining a value Z of a harmonic impedance of a high-pass damping filterDHP(ω); wherein j is an imaginary number;
s2-7, according to the formula:
obtaining and judging harmonic amplification factor HAR (omega) at first tuning frequencyt) If the value is less than or equal to A%, the step S2-8 is executed, otherwise, the step S2-10 is executed; wherein ZDHP(ωt) For high-pass damping filters in ω - ωtHarmonic impedance of (Z)DHP(ωt)∈ZDHP(ω)；ZS(ωt) For systems at a first tuning frequency omegatThe harmonic impedance of (a), the value of which is measured before the high-pass damping filter is installed;
s2-8, according to the formula:
obtaining the most severe harmonic amplification factor HAR at other frequenciesworst(ω); n is the total number of filters configured in the target converter station; zFi(ω) is the total harmonic impedance of the filter bank when i double tuned filters are put into use;
s2-9, judging HARworstIf (omega) is less than the value B, if so, updating the value B to HARworst(ω), and record the current capacitance value of the capacitor C1, the capacitance value of the capacitor C2, the inductance value of the inductor L1, the inductance value of the inductor L2, and the resistance value of the resistor R, and go to step S2-10; otherwise, directly entering step S2-10;
s2-10, judging whether the resistance value of the current resistor R is smaller than RmaxIf yes, adding 0.1 to the resistance value of the current resistor R and returning to the step S2-5; otherwise, entering step S2-11;
s2-11, judging whether the inductance value of the current inductor L2 is less than L2maxIf yes, adding 0.001 to the inductance value of the current inductor L2 and returning to the step S2-4; otherwise, outputting the latest parameter value recorded in the step S2-9, and finishing the parameter acquisition of the high-pass damping filter.
4. The method of claim 3 for suppressing non-characteristic harmonicsMethod of resonating, characterized in that the first tuning frequency ωtThe harmonic amplification limit a has a value of 0.3.
5. Method for suppressing non-characteristic harmonic resonances according to claim 3, characterized in that said second tuning frequency ωpThe harmonic amplification factor minimum B has a value of 3.
6. The method for suppressing non-characteristic harmonic resonance according to claim 2, wherein the specific method of step S3 includes the sub-steps of:
s3-1, according to the formula:
Z'DHP(ω)＝1/(jωC1)+jωL1+jωL2
obtaining harmonic impedance Z 'after switch K of high-pass damping filter is disconnected'DHP(ω); wherein j represents an imaginary number; ω represents angular frequency; c1Represents the capacitance value of the capacitance C1; l is1Represents the inductance value of the inductance L1; l is2Represents the inductance value of the inductance L2;
s3-2, obtaining harmonic impedance Z of the double-tuned filter according to parameters of the double-tuned filter in the target converter stationother(ω)；
S3-3, according to the formula:
Z'Fi(ω)＝Z'DHP(ω)//Zother(ω)＝(1/(jωC1)+jωL1+jωL2)//Zother(ω)
obtaining equivalent harmonic impedance Z 'of the whole filter bank after the target converter station puts in i double-tuned filters and the high-pass damping filter switch K is disconnected'Fi(ω); where// represents parallel; wherein the high-pass damping filter is one of 1-N filters put into use in the target converter station;
s3-4, obtaining the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)；
S3-5, according to the formula:
obtaining the maximum harmonic voltage U which may appear at the parallel connection point of the filters when the target converter station puts in 1-N filtersFimax(ω); wherein ZS-LeftAnd (ω) is the leftmost boundary value of the system harmonic impedance represented by the polygonal region.
7. The method for suppressing non-characteristic harmonic resonance according to claim 6, wherein the specific method of step S3-4 comprises the following sub-steps:
s3-4-1, obtaining the maximum value of the system background harmonic voltage when the double-tuned filter in the target converter station is not replaced by the high-pass damping filter, namely the maximum value U of the original system background harmonic voltageS(ω)；
S3-4-2, replacing one double-tuned filter in the target converter station with a high-pass damping filter, and according to the formula:
obtaining the harmonic impedance of the whole double-tuned filter bank from Z when a certain double-tuned filter in the current filter bank is switched on or switched offF1(ω) to ZF2(omega) parallel point voltage is represented by UF1(omega) to UF2Background harmonic voltage value U 'at (omega)'S(ω)；
S3-4-3, obtaining and judging the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) is greater than or equal to the maximum value U of the background harmonic voltage of the original systemS(ω), if so, the maximum background harmonic voltage value U 'in the step S3-4-2'S(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω), otherwise the original system background harmonic voltage maximum US(omega) as the maximum value U of the system background harmonic voltage of the current target converter stationSmax(ω)。
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