CN115204090A - Bridge arm reactor parameter optimization method and device and computer equipment - Google Patents
Bridge arm reactor parameter optimization method and device and computer equipment Download PDFInfo
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Abstract
The application relates to a method and a device for optimizing parameters of a bridge arm reactor, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring structural parameters of a bridge arm reactor, and calculating the temperature rise of each package in the bridge arm reactor based on the structural parameters; selecting a standard envelope according to the temperature rise of each envelope, calculating the temperature rise of the standard envelope and other envelopes, and calculating an envelope coefficient between the standard envelope and other envelopes; establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor. By adopting the method, the applicability of the bridge arm reactor under the alternating current-direct current composite working condition can be ensured.
Description
Technical Field
The present application relates to the field of electrical equipment technology, and in particular, to a method and an apparatus for optimizing parameters of a bridge arm reactor, a computer device, a storage medium, and a computer program product.
Background
The high-voltage direct-current transmission is widely applied by the advantages of small loss, uniform voltage distribution along the line, high system stability and the like, and a large number of alternating-current and direct-current composite reactors such as bridge arm reactors and the like are applied in each transmission project. The current flowing through the equipment has direct current components and alternating current components, but with the increasing scale of the power grid, the capacitive reactive power of the system is gradually increased, the nonlinear load is increased rapidly, the switching of the reactor is more and more frequent, the local overheating of the package is easy to occur, the degradation of the insulating material is accelerated, and the accidents of turn-to-turn short circuit, burning and the like are caused. According to investigation, the annual fault rate of the reactor is obviously increased along with the increase of the capacity, the annual fault rate of 20Mvar is as high as 5.63%, the temperature rise problem is more acute due to the high-voltage large-capacity development of the reactor, the fault is discovered by means of monitoring and measures are necessary, but the design defect needs to be corrected from the root.
On the basis, domestic and foreign scholars optimize from the angles of balanced temperature rise, simplified calculation, loss reduction and the like, but the influence of working conditions is not considered, so that the defect that the applicability of the bridge arm reactor is reduced under the alternating current-direct current composite working condition is caused.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus, a computer device, a computer readable storage medium, and a computer program product for optimizing parameters of a bridge arm reactor, which can ensure stable applicability under ac/dc composite operating conditions.
In a first aspect, the application provides a bridge arm reactor parameter optimization method. The method comprises the following steps:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In one embodiment, said selecting a standard envelope based on the temperature rise of each envelope, calculating the temperature rise of said standard envelope and the other envelopes and calculating the envelope coefficient between said standard envelope and the other envelopes comprises:
acquiring the temperature rise of each encapsulation based on the alternating current and direct current working conditions of the bridge arm reactors, and taking the encapsulation closest to the average value of the temperature rise of each encapsulation as a standard encapsulation;
an encapsulation factor between the standard encapsulation and the other encapsulation is obtained based on the temperature rises of the standard encapsulation and the other encapsulation.
In one embodiment, the equivalent voltage equation is:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
In one embodiment, the equal temperature rise constraint equation is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s To envelope the height of s, T sj Is the envelope coefficient between the standard envelope s and the envelope j.
In one embodiment, the obtaining the envelope coefficient between the standard envelope and the other envelope based on the temperature rise of the standard envelope and the other envelope includes:
the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
In one embodiment, the structural parameter comprises at least one of a rated voltage, a rated direct current, a rated power frequency current, a double frequency current, a rated inductance, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a rated loss, a transportation size limit, and a weight.
In a second aspect, the application further provides a bridge arm reactor parameter optimization device. The device comprises:
the acquisition module is used for acquiring structural parameters of the bridge arm reactors and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
the calculation module is used for selecting the standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
and the optimization module is used for establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
According to the bridge arm reactor parameter optimization method, the bridge arm reactor parameter optimization device, the computer equipment, the storage medium and the computer program product, the structural parameters of the bridge arm reactor are obtained, the temperature rise of each encapsulation in the bridge arm reactor is calculated based on the structural parameters, the standard encapsulation is selected according to the temperature rise of each encapsulation, the encapsulation coefficients between the standard encapsulation and other encapsulations are calculated according to the temperature rise of the standard encapsulation and other encapsulations, an equivalent voltage equation set and an isothermal temperature rise constraint equation are established, the equivalent voltage equation set is optimized by taking the isothermal temperature rise constraint equation as an optimization target, the structural parameters and each current of the bridge arm reactor after optimization are obtained, the optimization of the bridge arm reactor parameters under the alternating current and direct current composite working condition is realized, and the applicability of the bridge arm reactor under the alternating current and direct current composite working condition is ensured.
Drawings
FIG. 1 is an application environment diagram of a bridge arm reactor parameter optimization method in one embodiment;
FIG. 2 is a schematic flow chart of a method for optimizing parameters of a bridge arm reactor in one embodiment;
FIG. 3 is a schematic diagram of an encapsulation structure in one embodiment;
FIG. 4 is a structural block diagram of a bridge arm reactor parameter optimization device in one embodiment;
FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for optimizing parameters of the bridge arm reactor provided by the embodiment of the application can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be placed on the cloud or other network server.
The terminal 102 may be, but not limited to, a personal computer, a notebook computer, a smart phone, a tablet computer, an internet of things device, and a portable wearable device, which can each collect parameters of the bridge arm reactor, and the internet of things device may be an intelligent sound box, an intelligent television, an intelligent air conditioner, an intelligent vehicle-mounted device, and the like. The server 104 may be implemented as a stand-alone server or a server cluster comprised of multiple servers.
In an embodiment, as shown in fig. 2, a bridge arm reactor parameter optimization method is provided, which is described by taking the method as an example applied to the server in fig. 1, and includes the following steps:
step 202, obtaining structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters.
Specifically, obtaining structural parameters of the bridge arm reactor to be optimized, and calculating the temperature rise of each envelope in the bridge arm reactor when the structural parameters are realized; the current thermal effect is generated after the conductor passes through the current, and the temperature of the surface of the conductor continuously rises until the temperature is stable along with the time. The stable judgment condition is that the temperature difference between the front and the back of all test points within the test interval of 1 hour is not more than 2K, and the difference between the measured temperature of any test point and the average value of the environmental temperature in the last 1/4 period of the test is called temperature rise, and the unit is K.
And step 204, selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations.
Specifically, the envelope closest to the average value of the temperature rise of each envelope is selected from each envelope to serve as a standard envelope, and the envelope coefficient between the standard envelope and the other envelopes is calculated according to the temperature rise of the standard envelope and the temperature rises of the other envelopes except the standard envelope, wherein the envelope coefficient is used for constructing an isothermal constraint equation and is used for optimizing the equivalent temperature rise constraint equation. The equivalent voltage equation set is optimized through an equal temperature rise constraint equation, so that the temperature rise of each package is more balanced, the temperature rise of each package cannot be completely equal due to the limitation of a calculation means, but the difference between the maximum value and the minimum value of the average temperature rise of each package can reach a more reasonable value through multiple optimization iterations, the structure of the reactor is optimized and changed, whether design parameters meet design requirements or not needs to be verified after optimization, and especially, the requirements of rated inductance, transportation size limit and the like need to be paid attention.
And step 206, establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
Specifically, an equivalent voltage equation set and an isothermal rising constraint equation are established; for the bridge arm reactor consisting of n envelopes, the self inductance of each envelope and the mutual inductance of other envelopes can be calculated, and an envelope equivalent voltage equation set can be established on the basis according to kirchhoff's law for parameter optimization through an equal temperature rise method. And optimizing the equivalent voltage equation set by taking the isothermal rising constraint equation as an optimization target, and acquiring the optimized structural parameters and currents of the bridge arm reactor so as to adjust the parameters of the bridge arm reactor according to the optimization result.
According to the method for optimizing the parameters of the bridge arm reactor, the structural parameters of the bridge arm reactor are obtained, the temperature rise of each encapsulation in the bridge arm reactor is calculated based on the structural parameters, the standard encapsulation is selected according to the temperature rise of each encapsulation, the encapsulation coefficients between the standard encapsulation and other encapsulations are calculated according to the temperature rise of the standard encapsulation and the temperature rise of other encapsulations, an equivalent voltage equation set and an isothermal temperature rise constraint equation are established, the equivalent voltage equation set is optimized by taking the isothermal temperature rise constraint equation as an optimization target, the structural parameters and each current of the bridge arm reactor after optimization are obtained, the optimization of the parameters of the bridge arm reactor under the alternating current and direct current composite working condition is realized, and the applicability of the bridge arm reactor under the alternating current and direct current composite working condition is ensured.
In one embodiment, the selecting a standard envelope according to the temperature rise of each envelope, and the calculating the temperature rise of the standard envelope and the other envelopes to calculate the envelope coefficient between the standard envelope and the other envelopes includes:
acquiring the temperature rise of each package based on the alternating current and direct current working conditions of the bridge arm reactor, and taking the package closest to the average value of the temperature rise of each package as a standard package;
an encapsulation factor between the standard encapsulation and the other encapsulation is obtained based on the temperature rises of the standard encapsulation and the other encapsulation.
Specifically, the temperature rise of each package is obtained based on the alternating current and direct current working conditions of the bridge arm reactor, and the package closest to the average value of the temperature rise of each package is obtained from the temperature rise of each package and serves as a standard package. And acquiring an encapsulation coefficient between the standard encapsulation and other encapsulations through a preset encapsulation coefficient calculation formula based on the temperature rise of the standard encapsulation and other encapsulations, wherein the encapsulation coefficient is used for constructing an isothermal temperature rise constraint equation, so that the isothermal constraint equation can be used as an optimization target to optimize an equivalent voltage equation set, and the optimized structural parameters and each time current of the bridge arm reactor are acquired, so that the parameters of the bridge arm reactor are adjusted according to the optimization result.
In the embodiment, the temperature rise of each encapsulation is obtained based on the alternating current and direct current working conditions of the bridge arm reactor, the encapsulation closest to the average value of the temperature rise of each encapsulation is used as the standard encapsulation, and the encapsulation coefficient between the standard encapsulation and other encapsulations is obtained based on the temperature rises of the standard encapsulation and other encapsulations so as to construct an isothermal constraint equation to optimize an equivalent voltage equation set, so that the optimization effect on the isothermal constraint equation is improved.
In one embodiment, the equivalent voltage equation set is:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
In particular, accurate calculation of the envelope inductance is the basis for establishing the equivalent set of voltage equations. Mutual inductance calculation between non-coaxial parallel solenoid coils can calculate self inductance of each encapsulation and mutual inductance with other encapsulations for a reactor consisting of n encapsulations, and an encapsulation equivalent voltage equation set can be established according to kirchhoff's law on the basis:
the phase quantity in the equation set is large, the difficulty in solving the equation is large, the influence of the resistance can be ignored because the inductive reactance of the reactor is far greater than the resistance, and the phase of each branch current is the same at the moment, so that the phase factor is eliminated; at power frequency, the equation system is changed into the following form by combining simplified calculation of inductance:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I′ 1 +I′ 2 +I′ 3 +…+I′ n ＝I′ N
because the bridge arm reactor is an alternating current-direct current composite working condition, structural parameters obtained under alternating current and direct current are difficult to achieve consistency, the method is different from the conventional solution thought, and meanwhile, in order to eliminate the influence of frequency, the method carries out decomposition calculation: and calculating the frequency doubling and direct current of each envelope on the basis of the number of turns calculated under the power frequency.
Therefore, n-1 constraint equations of the isothermal rising method and an equivalent voltage equation set under power frequency are obtained in a simultaneous mode:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I′ 1 +I′ 2 +I′ 3 +…+I′ n ＝I′ N
in the formula, n 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
Wherein the envelope power frequency terminal voltage is:
U'＝I' N ×ωL N
where ω is the power frequency angular frequency, L N Is the rated inductance.
Solving the equation set to obtain each package turn number and power frequency current, checking the inductance and the size of the reactor, and finely adjusting structural parameters; based on all the structural parameters at this time, equivalent voltage equations under double frequency alternating current and direct current can be obtained by simplification respectively:
n 1 n 1 f 11 I″ 1 +n 1 n 2 f 12 I″ 2 +n 1 n 3 f 13 I″ 3 +…+n 1 n n f 1n I″ n ＝U″/2ω
n 2 n 1 f 21 I″ 1 +n 2 n 2 f 22 I″ 2 +n 2 n 3 f 23 I″ 3 +…+n 2 n n f 2n I″ n ＝U″/2ω
n 3 n 1 f 31 I″ 1 +n 3 n 2 f 32 I″ 2 +n 3 n 3 f 33 I″ 3 +…+n 3 n n f 3n I″ n ＝U″/2ω
n n n 1 f n1 I″ 1 +n n n 2 f n2 I″ 2 +n n n 3 f n3 I″ 3 +…+n n n n f nn I″ n ＝U″/2ω
I″ 1 +I″ 2 +I″ 3 +…+I″ n ＝I″ N
wherein the voltage at the double frequency end of the envelope is:
U″＝I″ N ×2ωL N
in the formula, I N Is rated as a double frequency current.
R 1 I″′ 1 ＝U″′
R 2 I″′ 2 ＝U″′
R 3 I″′ 3 ＝U″′
R n I″′ n ＝U″′
I″′ 1 +I″′ 2 +I″′ 3 +…+I″′ n ＝I″′ N
Wherein the encapsulated DC terminal voltage is:
U″′＝I″′ N ×R N
of formula (II)' n Rated for direct current, R N Is a rated resistance.
The total current for the ith envelope is:
in the formula (II)' i 、I″ N 、I″′ n Respectively, power frequency alternating current, double frequency alternating current and direct current of the envelope i.
In the embodiment, the equivalent voltage equation set and the isothermal lift constraint equation are established, the isothermal lift constraint equation is used as an optimization target to optimize the equivalent voltage equation set, and the optimized structural parameters and each current of the bridge arm reactor are obtained, so that the parameters of the bridge arm reactor are optimized under the alternating current and direct current composite working condition, and the applicability of the bridge arm reactor under the alternating current and direct current composite working condition is ensured.
In one embodiment, the iso-temperature rise constraint equation is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s Height, T, of envelope s sj Is the envelope coefficient between the standard envelope s and the envelope j.
Specifically, aiming at the alternating current-direct current composite working condition, an equivalent temperature rise constraint equation is modified:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s To envelope the height of s, T sj Is the envelope coefficient between the standard envelope s and the envelope j.
Shown in FIG. 3, R 1 、R 2 Two non-coaxial parallel coil radii, z 1 、z 2 Is the axial distance between the two coils, H 1 、H 2 Is the height of two coils, H 0 Is the center distance of the two coils, T is the center distance of the two coils, N 1 、N 2 The number of turns of the two coils.
When the central distance of the two coils is 0, the mutual inductance calculation of the two coaxial parallel cylindrical coils is carried out:
wherein:
H 1e ＝H 0 +(H 1 +H 2 )/2
H 2e ＝H 0 +(H 1 -H 2 )/2
the number of turns is extracted and popularized, and the mutual inductance of any two solenoids is as follows:
M ij ＝n i n j f(D i ,H i ,D j ,H j ,H ij )
in the formula, n i 、n j 、D i 、D j 、H i 、H j The number of turns, the diameter and the height of the ith solenoid and the jth solenoid respectively; h ij Is the center distance between the two solenoids (i =1,2, \8230;, n; j =1,2, \8230;, n; i ≠ j).
In the embodiment, the equivalent temperature rise constraint equation is improved according to the alternating current-direct current composite working condition, the equivalent voltage equation set is optimized by taking the isothermal temperature rise constraint equation as an optimization target, and the structure parameters and each current of the bridge arm reactor after optimization are obtained, so that the parameters of the bridge arm reactor are optimized under the alternating current-direct current composite working condition, and the applicability of the bridge arm reactor under the alternating current-direct current composite working condition is ensured.
In one embodiment, the obtaining the envelope coefficient between the standard envelope and the other envelope based on the temperature rise of the standard envelope and the other envelope comprises:
the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
In particular, the amount of the solvent to be used,based on the isothermal method, let the s-th envelope be the standard envelope, and define the envelope coefficient T for the envelope closest to the average value of the temperature rise of each envelope sj Comprises the following steps:
in the formula, T s 、T j The temperature rise of the envelope s and the envelope j, respectively (j =1,2, \8230;, n; j ≠ s).
In the embodiment, the quotient of the temperature rise of the standard encapsulation and the temperature rise of other encapsulations is obtained to serve as the encapsulation coefficient between the standard encapsulation and other encapsulations, so that the isothermal constraint equation can be adjusted conveniently according to the encapsulation coefficient, the optimization of parameters of the bridge arm reactor is improved, and the applicability of the bridge arm reactor under the alternating current and direct current composite working condition is ensured.
In one embodiment, the structural parameter includes at least one of a voltage rating, a direct current rating, a power frequency current rating, a frequency doubled current, an inductance rating, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a loss rating, a transport size limit, and a weight.
Specifically, the structural parameters of the bridge arm reactor comprise at least one of rated voltage, rated direct current, rated power frequency current, double frequency current, rated inductance, inductance manufacturing tolerance, direct current resistance, average temperature rise, hot point temperature rise, rated loss, transportation size limit and weight.
Taking an 800kv extra-high voltage flexible direct current engineering converter valve bridge arm reactor as an example, the known structural parameters are shown in table 1, and the series of parameters form basic constraint conditions for design and calculation.
TABLE 1
The temperature rise of each package is more balanced through optimization, and the temperature rise of each package cannot be completely equal due to the limitation of a calculation means. After six iterations, the difference between the maximum value and the minimum value of each package average temperature rise is reduced to 1.10K from 2.24K, and as the reactor structure is optimized and changed, whether design parameters meet design requirements needs to be checked after optimization, and the requirements of rated inductance, transportation size limits and the like are particularly concerned. By optimization, for encapsulation with higher temperature rise, the number of encapsulation turns is increased and the encapsulation current is reduced by optimization; for the encapsulation with lower temperature rise, the number of the encapsulation turns is reduced, the encapsulation current is increased, and the encapsulation temperature rise tends to be balanced overall.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the application also provides a bridge arm reactor parameter optimization device for realizing the bridge arm reactor parameter optimization method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so that specific limitations in the following embodiment of one or more bridge arm reactor parameter optimization devices can be referred to the limitations of the bridge arm reactor parameter optimization method in the foregoing, and details are not repeated herein.
In one embodiment, as shown in fig. 4, there is provided a bridge arm reactor parameter optimization device including: an obtaining module 401, a calculating module 402 and an optimizing module 403, wherein:
the obtaining module 401 is configured to obtain structural parameters of the bridge arm reactors, and calculate temperature rises of each enclosure in the bridge arm reactors based on the structural parameters;
a calculating module 402, configured to select a standard envelope according to the temperature rise of each envelope, calculate the temperature rises of the standard envelope and other envelopes, and calculate an envelope coefficient between the standard envelope and other envelopes;
the optimizing module 403 is configured to establish an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimize the equivalent voltage equation set with the isothermal temperature rise constraint equation as an optimization target, and obtain the optimized structural parameters and currents of the bridge arm reactor.
In an embodiment, the calculating module 402 is specifically configured to obtain the temperature rise of each encapsulation based on the ac/dc working condition of the bridge arm reactor, and use the encapsulation closest to the average value of the temperature rises of each encapsulation as a standard encapsulation;
an encapsulation factor between the standard encapsulation and the other encapsulation is obtained based on the temperature rises of the standard encapsulation and the other encapsulation.
In one embodiment, the equivalent voltage equation in the optimization module 403 is:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
In one embodiment, the isothermal liter constraint equation in the optimization module 403 is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s To envelope the height of s, T sj Is the envelope coefficient between the standard envelope s and the envelope j.
In one embodiment, the calculating module 402 is specifically configured to obtain a quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope as an envelope coefficient between the standard envelope and the other envelope.
In one embodiment, the structural parameters in the obtaining module 401 specifically include at least one of a rated voltage, a rated direct current, a rated power frequency current, a frequency doubling current, a rated inductance, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a rated loss, a transportation size limit, and a weight.
The bridge arm reactor parameter optimization device obtains structural parameters of the bridge arm reactor, calculates the temperature rise of each encapsulation in the bridge arm reactor based on the structural parameters, selects standard encapsulation according to the temperature rise of each encapsulation, calculates the encapsulation coefficient between the standard encapsulation and other encapsulations, establishes an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizes the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, obtains the structural parameters and each current of the bridge arm reactor after optimization, realizes the optimization of the bridge arm reactor parameters under the alternating current and direct current composite working condition, and ensures the applicability of the bridge arm reactor under the alternating current and direct current composite working condition.
All or part of each module in the bridge arm reactor parameter optimization device can be realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure thereof may be as shown in fig. 5. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method for optimizing parameters of a bridge arm reactor.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In one embodiment, the processor, when executing the computer program, further performs the steps of: acquiring the temperature rise of each package based on the alternating current and direct current working conditions of the bridge arm reactor, and taking the package closest to the average value of the temperature rise of each package as a standard package;
based on the temperature rises of the standard envelope and the other envelopes, envelope coefficients between the standard envelope and the other envelopes are obtained.
In one embodiment, the equivalent voltage equation set when the processor executes the computer program is:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
In one embodiment, the temperature rise constraint equation when the processor executes the computer program is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s To envelope the height of s, T sj Is the envelope coefficient between the standard envelope s and the envelope j.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
In one embodiment, the configuration parameters when the processor executes the computer program specifically include at least one of a rated voltage, a rated direct current, a rated power frequency current, a double frequency current, a rated inductance, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a rated loss, a transportation size limit, and a weight.
The computer equipment obtains the structural parameters of the bridge arm reactor, calculates the temperature rise of each encapsulation in the bridge arm reactor based on the structural parameters, selects the standard encapsulation according to the temperature rise of each encapsulation, calculates the encapsulation coefficient between the standard encapsulation and other encapsulations, establishes an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizes the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, obtains the structural parameters and each current of the bridge arm reactor after optimization, realizes the optimization of the parameters of the bridge arm reactor under the alternating current and direct current composite working condition, and ensures the applicability of the bridge arm reactor under the alternating current and direct current composite working condition.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring structural parameters of a bridge arm reactor, and calculating the temperature rise of each package in the bridge arm reactor based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring the temperature rise of each package based on the alternating current and direct current working conditions of the bridge arm reactor, and taking the package closest to the average value of the temperature rise of each package as a standard package;
an encapsulation factor between the standard encapsulation and the other encapsulation is obtained based on the temperature rises of the standard encapsulation and the other encapsulation.
In one embodiment, the computer program when executed by the processor comprises the equivalent set of voltage equations as:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
In one embodiment, the equal temperature rise constraint equation when the computer program is executed by the processor is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s Height, T, of envelope s sj Is the envelope coefficient between the standard envelope s and the envelope j.
In one embodiment, the computer program when executed by the processor further performs the steps of: the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
In one embodiment, the computer program, when executed by the processor, is configured to include at least one of a nominal voltage, a nominal direct current, a nominal power frequency current, a double frequency current, a nominal inductance, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a nominal loss, a transportation size limit, and a weight.
The storage medium obtains structural parameters of the bridge arm reactor, calculates the temperature rise of each encapsulation in the bridge arm reactor based on the structural parameters, selects standard encapsulation according to the temperature rise of each encapsulation, calculates the encapsulation coefficient between the standard encapsulation and other encapsulations by calculating the temperature rise of the standard encapsulation and other encapsulations, establishes an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizes the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, obtains the structural parameters and each current of the bridge arm reactor after optimization is completed, realizes the optimization of the parameters of the bridge arm reactor under the alternating current/direct current composite working condition, and ensures the applicability of the bridge arm reactor under the alternating current/direct current composite working condition.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
In one embodiment, the computer program when executed by the processor further performs the steps of: acquiring the temperature rise of each encapsulation based on the alternating current and direct current working conditions of the bridge arm reactors, and taking the encapsulation closest to the average value of the temperature rise of each encapsulation as a standard encapsulation;
based on the temperature rises of the standard envelope and the other envelopes, envelope coefficients between the standard envelope and the other envelopes are obtained.
In one embodiment, the computer program when executed by the processor has an equivalent voltage equation set of:
n 1 n 1 f 11 I' 1 +n 1 n 2 f 12 I' 2 +n 1 n 3 f 13 I' 3 +…+n 1 n n f 1n I' n ＝U'/ω
n 2 n 1 f 21 I' 1 +n 2 n 2 f 22 I' 2 +n 2 n 3 f 23 I' 3 +…+n 2 n n f 2n I' n ＝U'/ω
n 3 n 1 f 31 I' 1 +n 3 n 2 f 32 I' 2 +n 3 n 3 f 33 I' 3 +…+n 3 n n f 3n I' n ＝U'/ω
n n n 1 f n1 I' 1 +n n n 2 f n2 I' 2 +n n n 3 f n3 I' 3 +…+n n n n f nn I' n ＝U'/ω
I' 1 +I' 2 +I' 3 +…+I' n ＝I' N
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulated power frequency, and omega is the power frequency angular frequency.
In one embodiment, the equal temperature rise constraint equation when the computer program is executed by the processor is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s Height, T, of envelope s sj Is the envelope coefficient between the standard envelope s and the envelope j.
In one embodiment, the computer program when executed by the processor further performs the steps of: the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
In one embodiment, the computer program, when executed by the processor, is configured to include at least one of a nominal voltage, a nominal direct current, a nominal power frequency current, a double frequency current, a nominal inductance, an inductance manufacturing tolerance, a direct current resistance, an average temperature rise, a hot spot temperature rise, a nominal loss, a transportation size limit, and a weight.
The computer program product obtains structural parameters of the bridge arm reactor, calculates the temperature rise of each encapsulation in the bridge arm reactor based on the structural parameters, selects standard encapsulation according to the temperature rise of each encapsulation, calculates the encapsulation coefficient between the standard encapsulation and other encapsulations by calculating the temperature rise of the standard encapsulation and other encapsulations, establishes an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizes the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, obtains the structural parameters and each current of the bridge arm reactor after optimization, realizes the optimization of the parameters of the bridge arm reactor under the alternating current and direct current composite working condition, and ensures the applicability of the bridge arm reactor under the alternating current and direct current composite working condition.
It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the various embodiments provided herein may be, without limitation, general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, or the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A bridge arm reactor parameter optimization method is characterized by comprising the following steps:
acquiring structural parameters of the bridge arm reactors, and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
selecting standard encapsulation according to the temperature rise of each encapsulation, calculating the temperature rise of the standard encapsulation and other encapsulations, and calculating the encapsulation coefficient between the standard encapsulation and other encapsulations;
and establishing an equivalent voltage equation set and an isothermal rising constraint equation, optimizing the equivalent voltage equation set by taking the isothermal rising constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
2. The method of claim 1, wherein the selecting a standard envelope based on the temperature rise of each envelope, and calculating the temperature rise of the standard envelope and the other envelopes to calculate the envelope coefficient between the standard envelope and the other envelopes comprises:
acquiring the temperature rise of each package based on the alternating current and direct current working conditions of the bridge arm reactor, and taking the package closest to the average value of the temperature rise of each package as a standard package;
an encapsulation factor between the standard encapsulation and the other encapsulation is obtained based on the temperature rises of the standard encapsulation and the other encapsulation.
3. The method of claim 2, wherein the equivalent voltage equation set is:
wherein n is 1 n n f 1n Is the mutual inductance between coil 1 and coil n; i' n For encapsulating the power frequency current of n, U' is the end voltage of the encapsulating power frequency, and omega is the power frequency angular frequency.
4. The method of claim 3, wherein the iso-temperature rise constraint equation is:
wherein n is s To envelop the number of turns of s, I s To envelop the total current of s, J s Is the current density H under the AC-DC composite working condition s To envelope the height of s, T sj Is the envelope coefficient between the standard envelope s and the envelope j.
5. The method of claim 1, wherein obtaining the envelope coefficient between the standard envelope and the other envelope based on the temperature rise of the standard envelope and the other envelope comprises:
the quotient of the temperature rise of the standard envelope and the temperature rise of the other envelope is obtained as the envelope coefficient between the standard envelope and the other envelope.
6. The method of claim 1, wherein the structural parameters include at least one of voltage rating, direct current rating, line frequency current rating, frequency doubled current rating, inductance manufacturing tolerance, direct current resistance, average temperature rise, hot spot temperature rise, loss rating, shipping size limits, and weight.
7. A bridge arm reactor parameter optimization device, characterized in that the device comprises:
the acquisition module is used for acquiring structural parameters of the bridge arm reactors and calculating the temperature rise of each package in the bridge arm reactors based on the structural parameters;
the calculation module is used for selecting a standard envelope according to the temperature rise of each envelope, calculating the temperature rise of the standard envelope and other envelopes and calculating the envelope coefficient between the standard envelope and other envelopes;
and the optimization module is used for establishing an equivalent voltage equation set and an isothermal temperature rise constraint equation, optimizing the equivalent voltage equation set by taking the isothermal temperature rise constraint equation as an optimization target, and acquiring the optimized structural parameters and each current of the bridge arm reactor.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 6 when executed by a processor.
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| CN116136557A (en) * | 2023-04-20 | 2023-05-19 | 北京电科能创技术有限公司 | Temperature rise measurement method, equipment and medium for bridge arm reactor for flexible direct current transmission |
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