CN111751636A - Equivalent temperature rise test method for damping capacitor of high-voltage converter valve - Google Patents
Equivalent temperature rise test method for damping capacitor of high-voltage converter valve Download PDFInfo
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Abstract
The invention discloses an equivalent temperature rise test method for a damping capacitor of a high-pressure converter valve, which comprises the following steps of: establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies; establishing an equivalent circuit model of the damping capacitor to be tested, and testing the equivalent series resistance of the damping capacitor to be tested under different frequencies; setting the working frequency, the test time length and the temperature measuring point of the capacitor to be measured of the equivalent temperature rise test; calculating an effective value of test current required by the test; and carrying out the equivalent temperature rise test of the damping capacitor according to the set working frequency for carrying out the equivalent temperature rise test, the test time length, the temperature measuring point of the capacitor to be tested and the solved test current effective value. According to the method, the loss value of the damping capacitor during actual working is equivalently calculated, the frequency during testing is flexibly selected, the rationality of parameter selection of the equivalent temperature rise test is improved, the test flow is simplified, and the equivalent test is ensured to be in line with the actual application working condition of the tested damping capacitor to the maximum extent.
Description
Technical Field
The invention relates to the field of power systems, in particular to an equivalent temperature rise test method for a damping capacitor of a high-voltage converter valve.
Background
The temperature rise value is an important index of the damping capacitor, and the overhigh temperature rise value has direct influence on the service life and the internal insulation characteristic of the damping capacitor. The equivalent temperature rise test is the most effective means for testing the temperature rise condition of the damping capacitor, and can be used for testing the thermal stability, the thermal resistance value and the heat dissipation performance of the capacitor according to different test purposes.
In high-voltage direct-current transmission, in order to suppress voltage overshoot generated when a thyristor converter valve is turned off and ensure dynamic voltage equalization of a series thyristor stage, a damping loop formed by connecting a damping capacitor and a damping resistor in series is generally required to be connected in parallel at two ends of a thyristor. The complexity of the periodical on-off of the thyristor converter valve makes the current when the damping capacitor works not be of a single frequency but contain ripple current for several times or even dozens of times. On the other hand, the capacitor is not an ideal pure capacitive element due to the influence of the production process, material characteristics and the like, but an RLC circuit including parallel insulation resistance, equivalent series resistance and equivalent series inductance. The parallel insulation resistance inside the capacitor is usually large and reaches M omega or even G omega level, the loss generated by the parallel insulation resistance can be ignored usually, and the equivalent series resistance is the main factor of the capacitor loss. Due to the inherent characteristics of the capacitor, the equivalent series resistance of the capacitor is not constant, but changes with the change of the operating frequency, and in the operating interval, the schematic diagram of the change trend of the equivalent series resistance can refer to fig. 1. Therefore, when the equivalent active power of the damping capacitor temperature rise test is calculated, the influence of the working frequency of the damping capacitor temperature rise test needs to be considered, and the difference between the magnitude of each harmonic current in the working current and the equivalent series resistance at each harmonic frequency is mainly reflected.
Patent CN102175939B discloses a method for power capacitor temperature rise test, which mainly introduces temperature rise test of capacitor at normal temperature to infer its temperature rise value at other specific ring temperature, but does not describe the method for setting important test parameters such as equivalent method of test current and selection of test frequency. At present, current values under fundamental wave frequency are mostly adopted for testing when damping capacitor equivalent temperature rise tests are carried out, the influence of high-frequency ripple current and harmonic waves existing in the practical application of a damping capacitor on the damping capacitor equivalent series resistor is ignored, the real loss of the tested capacitor under the practical application working condition cannot be accurately equivalent, and the method has direct influence on the aspects of evaluating the service life of the damping capacitor, designing heat dissipation performance, measuring thermal resistance value and the like.
Disclosure of Invention
In view of this, the embodiment of the present invention is expected to provide an equivalent temperature rise test method for a damping capacitor of a high-voltage converter valve, which calculates a loss value of the damping capacitor during actual operation through equivalence, flexibly selects a frequency during a test, overcomes a problem of low equivalence during a temperature rise test of the damping capacitor of the current high-voltage converter valve, improves rationality of parameter selection of the equivalent temperature rise test, simplifies a test process, and ensures that the equivalent test maximally conforms to an actual application condition of the measured damping capacitor.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an equivalent temperature rise test method for a damping capacitor of a high-pressure converter valve comprises the following steps:
step S1: establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies;
step S2: establishing an equivalent circuit model of the damping capacitor to be tested, and testing equivalent series resistance of the damping capacitor to be tested under different frequencies;
step S3: setting the working frequency for carrying out the equivalent temperature rise test, and obtaining the equivalent series resistance of the capacitor to be tested under the set test frequency according to the step S2; setting the test time length for carrying out the equivalent temperature rise test and the temperature measuring point of the capacitor to be measured;
step S4: calculating a test current effective value required in the equivalent temperature rise test according to the effective value of each current at different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be tested at different frequencies in the step S2;
step S5: and (4) performing the equivalent temperature rise test of the damping capacitor according to the working frequency, the test time length and the temperature measuring point of the capacitor to be tested which are set in the step S3 and the test current effective value obtained in the step S4.
Preferably, the step S1 specifically includes the following steps:
step S101: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
step S102: solving the current of the damping capacitor to be tested during working;
step S103: and carrying out Fourier transformation on the current of the damping capacitor to be tested during working, and solving the effective value of each current of the capacitor to be tested under different frequencies.
Preferably, the step S3 specifically includes the following steps:
step S301: setting the working frequency for carrying out an equivalent temperature rise test;
step S302: according to the selected test frequency, the equivalent series resistance of the capacitor to be tested under the frequency is found according to the test result of the step S2;
step S303: setting x temperature measurement points T of capacitor to be measured in equivalent temperature rise test1～Tx。
T1～TxThe arrangement of the capacitance measuring device at least comprises 1 environment temperature measuring point and 1 temperature measuring point inside or outside the capacitance to be measured, and x is an integer larger than 1;
step S304: setting temperature rise test time;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dispersion test.
Preferably, the step S4 specifically includes the following steps:
step S401: calculating the active power of the capacitor to be measured under different frequencies according to the effective value of each current under different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be measured under different frequencies in the step S2;
step S402: calculating the total active power of the capacitor to be detected according to the active power of the capacitor to be detected under different frequencies in the step S401;
step S403: and calculating the test current effective value required during the equivalent temperature rise test according to the equivalent series resistance of the capacitors to be tested in the step 3 and the total active power of the capacitors to be tested obtained in the step S402.
Preferably, the step S1 specifically includes the following steps:
step S1001: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
the equivalent circuit model comprises a three-phase alternating current power supply with three-phase voltage phases sequentially different by 120 degrees, and the effective value of the phase voltage is U0Fundamental frequency of f06 a ripple bridge, equivalent load resistance R; the three-phase alternating current power supply is connected with the alternating current side of the 6 pulse bridge, and the equivalent load resistor R is connected between the positive port and the negative port of the direct current side of the 6 pulse bridge; the 6-pulse bridge consists of 6 bridge arms, each bridge arm consists of N thyristor-level circuits, N is an integer greater than or equal to 1, each thyristor-level circuit comprises 1 thyristor device and a damping loop connected in parallel with the thyristor device, and the damping loop consists of a damping capacitor and a damping resistor which are connected in series;
step S1002: solving the current of the damping capacitor to be tested during working;
the trigger angle of the 6-pulse bridge is set to be 90 degrees, and the three-phase alternating voltage U is set1Load shedding coefficient k for AC systemaAnd phase voltage U0The current of the obtained damping capacitor during working is recorded as Ic；
Step S1003: solving for damping capacitors at different frequencies nf0Effective value of the next current In；
The current I obtained in S1002 when the damping capacitor to be measured workscFourier transform is performed to obtain
In the formula (f)0For AC system fundamental frequency, N is 1,2 … N, InTo correspond to a frequency nf0The lower current effective value.
Preferably, the step S2 specifically includes the following steps:
step S2001: establishing an equivalent circuit model of a damping capacitor to be tested;
the equivalent circuit model is formed by connecting a capacitor and a resistor in series, the capacitance value of the capacitor is the nominal rated capacitance value of the capacitor to be tested and is marked as C, the resistor is the equivalent series resistor of the capacitor to be tested, the resistance value is measured by an instrument, nf is measured by an instrument0Resistance at frequency is denoted as Rn；
Step S2002: testing different frequencies nf0Equivalent series resistance R of lower damping capacitor to be testedn。
Preferably, the step S3 specifically includes the following steps:
step S3001: setting working frequency mf for carrying out equivalent temperature rise test0；
Wherein m is an integer, and m is not more than n;
step S3002: finding a set trial frequency mf0Equivalent series resistance R of capacitor to be measuredm；
Setting the trial frequency mf according to step S30010And the equivalent series resistance R of the damping capacitor under different frequencies measured in the step S2002nTo obtain the selected test frequency mf0Equivalent series resistance R of capacitor to be measuredm。
Step S3003: setting x temperature measurement points T of capacitor to be measured in equivalent temperature rise test1～Tx。
T1～TxThe arrangement of the capacitance measuring device at least comprises 1 environment temperature measuring point and 1 temperature measuring point inside or outside the capacitance to be measured, and x is an integer larger than 1;
step S3004: setting test time t for carrying out an equivalent temperature rise test;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dispersion test.
Preferably, the step S4 specifically includes the following steps:
step S4001: calculating different frequencies nf0Active power P of capacitor to be measuredn；
According to the different frequencies nf obtained in step S10030Effective value of the lower current InAnd the frequency nf measured in step S20020Lower equivalent series resistance RnCalculating the different frequencies nf according to the following formula0Active power P of capacitor to be measuredn：
Pn＝(Ka·In)·Rn
In the formula KaIs a test coefficient;
step S4002: calculating equivalent test power P of capacitor to be testeds；
The different frequencies nf obtained in step S40010Active power P of capacitor to be measurednCalculating the equivalent test power P of the capacitor to be tested according to the following formulas：
Step S4003: calculating the effective value I of the test current required in the equivalent temperature rise testm；
According to the trial-time frequency mf in step S30020Equivalent series resistance R of timemAnd step S4002, obtaining the total power P of the capacitor to be measuredsCalculating the equivalent test current effective value I of the capacitor to be tested according to the following formulam：
Preferably, the test coefficient K in the step S4001aThe value range is 1.05-1.2.
PreferablyThe operating frequency for performing the equivalent temperature rise test in step S5 is mf set in step S30010The test time is T set in step S3004, and the temperature measurement point is T set in step S30031～TxThe effective value of the test current is I obtained in step S4003m。
The invention has the beneficial effects that: the invention calculates the loss value of the damping capacitor in actual work through equivalent, flexibly selects the frequency in test, improves the rationality of parameter selection of equivalent temperature rise test, simplifies the test flow, and ensures that the equivalent test conforms to the actual application working condition of the tested damping capacitor to the maximum extent.
Drawings
FIG. 1 is a diagram showing the relationship between the equivalent series resistance of a damping capacitor and the frequency;
FIG. 2 is a flowchart of an equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve in embodiment 1 of the present invention;
FIG. 3 is a flowchart of an equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve in embodiment 2 of the present invention;
FIG. 4 is a flowchart of an equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve in embodiment 3 of the present invention;
fig. 5 is an equivalent circuit of an application condition of a damping capacitor of a high-voltage converter valve by applying high-voltage direct-current transmission in an embodiment of an equivalent temperature rise test method of the damping capacitor of the high-voltage converter valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1:
fig. 2 is a flowchart of an embodiment 1 of an equivalent temperature rise test method for a damping capacitor of a high-pressure converter valve, and the equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve, shown in the figure, includes the following steps:
step S1: and establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies.
Step S2: and establishing an equivalent circuit model of the damping capacitor to be tested, and testing the equivalent series resistance of the damping capacitor to be tested under different frequencies.
Step S3: setting the working frequency for carrying out the equivalent temperature rise test, and obtaining the equivalent series resistance of the capacitor to be tested under the set test frequency according to the step S2; and setting the test time length for carrying out the equivalent temperature rise test and the temperature measuring point of the capacitor to be measured.
Step S4: and calculating the test current effective value required in the equivalent temperature rise test according to the effective value of each current at different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be tested at different frequencies in the step S2.
Step S5: and (4) performing the equivalent temperature rise test of the damping capacitor according to the working frequency, the test time length and the temperature measuring point of the capacitor to be tested which are set to perform the equivalent temperature rise test in the step S3 and the test current effective value obtained in the step S4.
Example 2:
fig. 3 is a flowchart of an embodiment 2 of an equivalent temperature rise test method for a damping capacitor of a high-pressure converter valve, and the equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve, shown in the diagram, includes the following steps:
step S1: and establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies. The method specifically comprises the following steps:
step S101: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
step S102: solving the current of the damping capacitor to be tested during working;
step S103: and carrying out Fourier transformation on the current of the damping capacitor to be detected during working, and solving the effective value of each current of the capacitor to be detected under different frequencies.
Step S2: and establishing an equivalent circuit model of the damping capacitor to be tested, and testing the equivalent series resistance of the damping capacitor to be tested under different frequencies.
Step S3: setting the working frequency for carrying out the equivalent temperature rise test, and obtaining the equivalent series resistance of the capacitor to be tested under the set test frequency according to the step S2; and setting the test time length for carrying out the equivalent temperature rise test and the temperature measuring point of the capacitor to be measured. The method specifically comprises the following steps:
step S301: setting the working frequency for carrying out an equivalent temperature rise test;
step S302: according to the selected test frequency, the equivalent series resistance of the capacitor to be tested under the frequency is found according to the test result of the step S2;
step S303: x temperature measurement points T1 to Tx of the capacitor to be measured when the equivalent temperature rise test is performed are set.
The arrangement of T1-Tx at least comprises 1 environmental temperature measuring point and 1 temperature measuring point inside or outside the capacitor to be measured, and x is an integer greater than 1;
step S304: setting temperature rise test time;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dissipation performance test.
Step S4: and calculating the test current effective value required in the equivalent temperature rise test according to the effective value of each current at different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be tested at different frequencies in the step S2. The method specifically comprises the following steps:
step S401: calculating the active power of the capacitor to be measured under different frequencies according to the effective value of each current under different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be measured under different frequencies in the step S2;
step S402: calculating the total active power of the capacitor to be measured according to the active power of the capacitor to be measured under different frequencies in the step S401;
step S403: and calculating the test current effective value required during the equivalent temperature rise test according to the equivalent series resistance of the capacitors to be tested in the step 3 and the total active power of the capacitors to be tested obtained in the step S402.
Step S5: and (4) performing the equivalent temperature rise test of the damping capacitor according to the working frequency, the test time length and the temperature measuring point of the capacitor to be tested which are set to perform the equivalent temperature rise test in the step S3 and the test current effective value obtained in the step S4.
Example 3:
fig. 4 is a flowchart of an embodiment 3 of the equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve, and as shown in the drawing, the equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve, which includes the following steps:
step S1: and establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies. The method specifically comprises the following steps:
step S1001: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
fig. 5 shows an equivalent circuit of an application condition of a damping capacitor applying a high-voltage direct-current transmission converter valve in an embodiment of an equivalent temperature rise test method for a damping capacitor of a high-voltage converter valve according to the present invention. The equivalent circuit model comprises a three-phase alternating current power supply 11 with three-phase voltage phases sequentially different by 120 degrees, and the effective value of the phase voltage is U0Fundamental frequency of f06 ripple bridge 12, equivalent load resistance R13; wherein, a three-phase AC power supply 11 is connected with the AC side of a 6-pulse bridge 12, and an equivalent load resistor R is connected between the positive and negative ports of the DC side of the 6-pulse bridge 12; the 6-pulse bridge 12 consists of 6 bridge arms 14, each bridge arm consists of N thyristor-level circuits 15, N is an integer greater than or equal to 1, each thyristor-level circuit 15 comprises 1 thyristor device and a damping loop 16 connected in parallel with the thyristor device, and the damping loop 16 consists of a damping capacitor 17 and a damping resistor 18 which are connected in series;
step S1002: solving the current of the damping capacitor 17 to be tested during working;
the trigger angle of the 6-pulse bridge is set to be 90 degrees, and the three-phase alternating voltage U is set1Load shedding coefficient k for AC systemaAnd phase voltage U0The current of the obtained damping capacitor during working is recorded as Ic；
Step S1003: solving for damping capacitors at different frequencies nf0Effective value of the next current In；
Working on the damping capacitor to be measured obtained in S1002Current of time IcFourier transform is performed to obtain
In the formula (f)0For AC system fundamental frequency, N is 1,2 … N, InTo correspond to a frequency nf0The lower current effective value.
Step S2: and establishing an equivalent circuit model of the damping capacitor to be tested, and testing the equivalent series resistance of the damping capacitor to be tested under different frequencies. The method specifically comprises the following steps:
step S2001: establishing an equivalent circuit model of a damping capacitor to be tested;
the equivalent circuit model is composed of a capacitor and a resistor in series connection, the capacitance value of the capacitor is the nominal rated capacitance value of the capacitor 17 to be tested and is marked as C, the resistor is the equivalent series resistance of the capacitor 17 to be tested, the resistance value is measured by an instrument, nf is measured by an instrument0Resistance at frequency is denoted as Rn；
Step S2002: testing different frequencies nf0Equivalent series resistance R of lower damping capacitor to be testedn。
Step S3: setting the working frequency for carrying out the equivalent temperature rise test, and obtaining the equivalent series resistance of the capacitor to be tested under the set test frequency according to the step S2; and setting the test time length for carrying out the equivalent temperature rise test and the temperature measuring point of the capacitor to be measured. The method specifically comprises the following steps:
step S3001: setting working frequency mf for carrying out equivalent temperature rise test0；
Wherein m is an integer, and m is not more than n;
step S3002: finding a set trial frequency mf0Equivalent series resistance R of capacitor to be measuredm；
Setting the trial frequency mf according to step S30010And the equivalent series resistance R of the damping capacitor at different frequencies measured in step S2002nTo obtain the selected test frequency mf0Equivalent series resistance R of capacitor to be measuredm。
Step S3003: setting is performed, etcX temperature measurement points T of capacitor to be measured in effect temperature rise test1～Tx。
T1～TxThe arrangement of the capacitance measuring device at least comprises 1 environment temperature measuring point and 1 temperature measuring point inside or outside the capacitance to be measured, and x is an integer larger than 1;
step S3004: setting test time t for carrying out an equivalent temperature rise test;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dissipation performance test.
Step S4: and calculating the test current effective value required in the equivalent temperature rise test according to the effective value of each current at different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be tested at different frequencies in the step S2. The method specifically comprises the following steps:
step S4001: calculating different frequencies nf0Active power P of capacitor to be measuredn；
According to the different frequencies nf obtained in step S10030Effective value of the lower current InAnd the frequency nf measured in step S20020Lower equivalent series resistance RnCalculating the different frequencies nf according to the following formula0Active power P of capacitor to be measuredn：
Pn＝(Ka·In)·Rn
In the formula KaThe test coefficient is in the range of 1.05-1.2, 1.1 in this example.
Step S4002: calculating equivalent test power P of capacitor to be testeds；
The different frequencies nf obtained in step S40010Active power P of capacitor to be measurednCalculating the equivalent test power P of the capacitor to be tested according to the following formulas：
Step S4003: calculating the equivalent temperature rise required in the testEffective value of test current Im；
According to the trial-time frequency mf in step S30020Equivalent series resistance R of timemAnd step S4002, obtaining the total power P of the capacitor to be measuredsCalculating the equivalent test current effective value I of the capacitor to be tested according to the following formulam：
Step S5: and carrying out the equivalent temperature rise test of the damping capacitor according to the set working frequency for carrying out the equivalent temperature rise test, the test time length, the temperature measuring point of the capacitor to be tested and the solved test current effective value. Using the working frequency for performing the equivalent temperature rise test as mf set in step S30010The test duration is T set in step S3004, and the temperature measurement point is T set in step S30031～TxThe effective value of the test current is I obtained in step S4003m。
Testing according to the above steps, recording temperature measuring point T1～TxTemperature data of (a).
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (10)
1. An equivalent temperature rise test method for a damping capacitor of a high-pressure converter valve is characterized by comprising the following steps:
step S1: establishing an equivalent circuit of the application working condition of the damping capacitor to be tested, and solving the effective value of each current of the damping capacitor under different frequencies;
step S2: establishing an equivalent circuit model of the damping capacitor to be tested, and testing the equivalent series resistance of the damping capacitor to be tested under different frequencies;
step S3: setting the working frequency for carrying out the equivalent temperature rise test, and obtaining the equivalent series resistance of the capacitor to be tested under the set test frequency according to the step S2; setting the test time length for carrying out the equivalent temperature rise test and the temperature measuring point of the capacitor to be measured;
step S4: calculating a test current effective value required in the equivalent temperature rise test according to the effective value of each current at different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be tested at different frequencies in the step S2;
step S5: and (4) performing the equivalent temperature rise test of the damping capacitor according to the working frequency, the test time length and the temperature measuring point of the capacitor to be tested which are set for performing the equivalent temperature rise test in the step S3 and the test current effective value obtained in the step S4.
2. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 1, wherein the step S1 specifically comprises the following steps:
step S101: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
step S102: solving the current of the damping capacitor to be tested during working;
step S103: and carrying out Fourier transformation on the current of the damping capacitor to be tested during working, and solving the effective value of each current of the capacitor to be tested under different frequencies.
3. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 1, wherein the step S3 specifically comprises the following steps:
step S301: setting the working frequency for carrying out an equivalent temperature rise test;
step S302: according to the selected test frequency, the equivalent series resistance of the capacitor to be tested under the frequency is found according to the test result of the step S2;
step S303: setting x temperature measurement points T of capacitor to be measured in equivalent temperature rise test1～Tx。
T1～TxThe arrangement of the capacitance measuring device at least comprises 1 environment temperature measuring point and 1 temperature measuring point inside or outside the capacitance to be measured, and x is an integer larger than 1;
step S304: setting temperature rise test time;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dissipation performance test.
4. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 1, wherein the step S4 specifically comprises the following steps:
step S401: calculating the active power of the capacitor to be measured under different frequencies according to the effective value of each current under different frequencies in the step S1 and the equivalent series resistance of the damping capacitor to be measured under different frequencies in the step S2;
step S402: calculating the total active power of the capacitor to be measured according to the active power of the capacitor to be measured under different frequencies in the step S401;
step S403: and calculating the test current effective value required during the equivalent temperature rise test according to the equivalent series resistance of the capacitors to be tested in the step 3 and the total active power of the capacitors to be tested obtained in the step S402.
5. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 1, wherein the step S1 specifically comprises the following steps:
step S1001: establishing an equivalent circuit model of the application condition of the damping capacitor to be tested;
the equivalent circuit model comprises a three-phase alternating current power supply (11) with three-phase voltage phases sequentially different by 120 degrees, and the effective value of the phase voltage is U0Fundamental frequency of f06 a ripple bridge (12), an equivalent load resistance R (13); the three-phase alternating current power supply (11) is connected with the alternating current side of the 6 pulse bridge (12), and the equivalent load resistor R is connected between the positive and negative ports of the direct current side of the 6 pulse bridge (12); the 6-pulse bridge (12) is composed of 6 bridge arms (14), each bridge arm is composed of N thyristor-level circuits (15), N is an integer greater than or equal to 1, each thyristor-level circuit (15) comprises 1 thyristor device and a damping loop (16) connected with the thyristor device in parallel, and the damping loop (16) is composed of a damping capacitor (17) and a damping loopThe resistors (18) are connected in series;
step S1002: solving the current of the damping capacitor (17) to be tested when working;
the trigger angle of the 6-pulse bridge is set to be 90 degrees, and the three-phase alternating voltage U is set1Load shedding coefficient k for AC systemaAnd phase voltage U0The current of the obtained damping capacitor during working is recorded as Ic；
Step S1003: solving for damping capacitors at different frequencies nf0Effective value of the next current In；
The current I obtained in S1002 when the damping capacitor to be measured workscFourier transform is performed to obtain
In the formula (f)0For AC system fundamental frequency, N is 1,2 … N, InTo correspond to a frequency nf0The lower current effective value.
6. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 5, wherein the step S2 specifically comprises the following steps:
step S2001: establishing an equivalent circuit model of a damping capacitor to be tested;
the equivalent circuit model is formed by connecting a capacitor and a resistor in series, the capacitance value of the capacitor is the nominal rated capacitance value of the capacitor (17) to be tested and is marked as C, the resistor is the equivalent series resistor of the capacitor (17) to be tested, the resistance value is measured by an instrument, nf0Resistance at frequency is denoted as Rn；
Step S2002: testing different frequencies nf0Equivalent series resistance R of lower damping capacitor to be testedn。
7. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 6, wherein the step S3 specifically comprises the following steps:
step S3001: setting working frequency mf for carrying out equivalent temperature rise test0；
Wherein m is an integer, and m is not more than n;
step S3002: finding a set trial frequency mf0Equivalent series resistance R of capacitor to be measuredm；
Setting the trial frequency mf according to step S30010And the equivalent series resistance R of the damping capacitor at different frequencies measured in step S2002nTo obtain the selected test frequency mf0Equivalent series resistance R of capacitor to be measuredm。
Step S3003: setting x temperature measurement points T of capacitor to be measured in equivalent temperature rise test1～Tx。
T1～TxThe arrangement of the capacitance measuring device at least comprises 1 environment temperature measuring point and 1 temperature measuring point inside or outside the capacitance to be measured, and x is an integer larger than 1;
step S3004: setting test time t for carrying out an equivalent temperature rise test;
the value of the test duration t depends on the test purpose, which includes: the method comprises the following steps of capacitor life test, capacitor thermal resistance test and capacitor heat dissipation performance test.
8. The equivalent temperature rise test method of the damping capacitor of the high-pressure converter valve according to claim 7, wherein the step S4 specifically comprises the following steps:
step S4001: calculating different frequencies nf0Active power P of capacitor to be measuredn；
According to the different frequencies nf obtained in step S10030Effective value of the lower current InAnd the frequency nf measured in step S20020Lower equivalent series resistance RnCalculating the different frequencies nf according to the following formula0Active power P of capacitor to be measuredn：
Pn＝(Ka·In)·Rn
In the formula KaIs a test coefficient;
step S4002: calculating the equivalent test of the capacitor to be testedPower of experiment Ps；
The different frequencies nf obtained in step S40010Active power P of capacitor to be measurednCalculating the equivalent test power P of the capacitor to be tested according to the following formulas：
Step S4003: calculating the effective value I of the test current required in the equivalent temperature rise testm；
According to the trial-time frequency mf in step S30020Equivalent series resistance R of timemAnd step S4002, obtaining the total power P of the capacitor to be measuredsCalculating the equivalent test current effective value I of the capacitor to be tested according to the following formulam：
9. The equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve according to claim 8, wherein the test coefficient K in the step S4001 isaThe value range is 1.05-1.2.
10. The equivalent temperature rise test method for the damping capacitor of the high-pressure converter valve according to claim 8, wherein the operating frequency for performing the equivalent temperature rise test in the step S5 is mf set in the step S30010The test time is T set in step S3004, and the temperature measurement point is T set in step S30031～TxThe effective value of the test current is I obtained in step S4003m。
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