CN108418206A - Dry-type smoothing reactor loss calculation method and device as well as evaluation method and device - Google Patents

Abstract

The present invention provides a dry type smoothing reactor loss calculation method and device based on equal heat flux and an evaluation method and device, first determine the inductance matrix and resistance matrix of the dry type smoothing reactor, and then calculate the dry type smoothing reactance AC and DC distribution of the reactor, and finally calculate the loss of the dry-type smoothing reactor, and evaluate the loss of the dry-type smoothing reactor. The invention can accurately calculate the resistive loss of the winding coils of each layer of the dry-type smoothing reactor, and does not need to increase the temperature rise margin and increase the DC current in the temperature rise test to ensure the safety of the dry-type smoothing reactor, avoiding It reduces the cost of insulating materials, and requires fewer wires, which results in low cost and light weight. At the same time, the invention solves the problem of heat dissipation and temperature rise control of the dry-type smoothing reactor in a limited space under natural circulation conditions, thereby greatly reducing the probability of accidents caused by excessive temperature rise of the dry-type smoothing reactor and ensuring the reactance The device is stable, reliable and uninterrupted operation.

Description

Dry-type smoothing reactor loss calculation method and device as well as evaluation method and device

technical field

The invention relates to the technical field of power electronics, in particular to a method and device for calculating loss of a dry-type smoothing reactor based on equal heat flux and an evaluation method and device.

Background technique

UHV dry-type (hollow) smoothing reactor is one of the most important equipment of UHV DC transmission project. It is generally connected in series between the converter transformer and the DC transmission line. Overvoltage protection and other aspects have played an important role, and because of its oil-free, environmental protection, no auxiliary operating system, and basic maintenance-free advantages, it has been widely used in power grids.

The dry-type smoothing reactor is composed of n coaxial winding coils, each winding coil is wound by one or more parallel transposed wires, and each transposed wire is made of multi-strand monofilament round composed of wires. The winding coils are separated by air passages and stays. The stays are mainly used for fixing, and the air passages are used to improve the heat dissipation performance of the dry-type smoothing reactor. In the electrical connection, multiple coaxial winding coils are connected in parallel, and its equivalent circuit model is shown in Figure 1, where L _1,1 , L _2,2 , L _3,3 ,..., L _n,n are The self-inductance of the winding coils, M _1,2 , M _1,3 , M _1,4 , ... etc. are the mutual inductance between the winding coils, R ₁ , R ₂ , ... R _n The wire resistance of each layer of winding coils, I ₁ , I ₂ ,…, _In are the currents of each winding coil, _UL is the voltage of the dry-type smoothing reactor, and I _L is the current of the dry-type smoothing reactor.

When DC current or harmonic current flows through the winding coil, it will cause loss and heat due to the internal resistance of the winding coil itself, which is the main source of temperature rise of the dry-type smoothing reactor. The loss of the winding coil mainly includes DC resistive loss, AC resistive loss (including circulation loss) and eddy current loss. Among them, the eddy current loss accounts for a small proportion of the loss of the winding coil. In addition, the application of the internal transposition wire can greatly reduce the eddy current loss, so that the proportion of the eddy current loss in the loss of the winding coil can be ignored. Therefore, in When analyzing the temperature rise of hot spots, DC resistive loss and AC resistive loss are mainly considered. The research on the loss and temperature rise of dry-type smoothing reactor in the prior art mainly focuses on the DC resistive loss and the distribution of the temperature rise of the dry-type smoothing reactor under the action of DC resistive loss, without considering the AC resistance Influence of resistive loss and AC resistive loss on temperature rise distribution of dry-type smoothing reactor. In actual operation, the AC resistive loss borne by the dry-type smoothing reactor will cause the displacement of the hot spot.

In actual operation, accidents caused by dry-type smoothing reactors due to temperature rise problems (hot spot temperature rise too high and local overheating, etc.) occur frequently. Most dry-type smoothing reactors are accidents caused by the high hot spot temperature during operation, which accelerates the aging of the polyester film. When the rainwater infiltrates into the lead-in line or the epoxy crack on the transverse surface, the aging is accelerated, and the mechanical strength is lost, so it cannot be wrapped If the wire is tight, when rainwater seeps in many times, it will cause a short circuit between turns and cause a fire. Excessive temperature rise of hot spots and uneven average temperature rise of each layer of winding coils are the main causes of accidents. However, in the research of dry-type smoothing reactors in the prior art, due to the inability to accurately calculate the The loss of winding coils usually ensures the safety of dry-type smoothing reactors by increasing the temperature rise margin and increasing the DC current in the temperature rise test, but increasing the temperature rise margin will increase the cost of insulating materials and the required wires More, the cost of dry smoothing reactor is high, and light weight cannot be achieved.

Contents of the invention

In order to overcome the above-mentioned defects of high cost and inability to achieve lightweight dry type smoothing reactors in the prior art, the present invention provides a dry type smoothing reactor loss calculation method and device based on equal heat flux density, as well as an evaluation method and device, First determine the inductance matrix and resistance matrix of the dry-type smoothing reactor, then calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and resistance matrix of the dry-type smoothing reactor, and finally according to the dry-type smoothing reactor The AC and DC distribution accurately calculates the loss of the dry-type smoothing reactor, and evaluates the loss of the dry-type smoothing reactor based on the equal heat flux density and the loss threshold, which realizes the lightweight and low cost of the dry-type smoothing reactor.

In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

On the one hand, the present invention provides a method for calculating the loss of a dry-type smoothing reactor based on equal heat flux. The dry-type smoothing reactor includes n parallel winding coils. The loss calculation method includes:

Determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

Calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and resistance matrix of the dry-type smoothing reactor;

Calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor.

The inductance matrix of the dry-type smoothing reactor is determined by a Bartky transformation method or a finite element simulation method.

The resistance matrix of the dry smoothing reactor is determined by the following formula:

Among them, K _R represents the resistance matrix of the dry-type smoothing reactor, which is a diagonal matrix; R _i represents the resistance of the i-th winding coil, and Δt represents the average temperature rise of the wire, _ρ0 represents the resistivity of the wire, α represents the temperature coefficient, a represents the filling factor, S _i represents the wire cross-sectional area of the i-th winding coil, l _i represents the wire length of the i-th winding coil ,and H _i represents the height of the i-th winding coil, r _i represents the radius of the i-th winding coil, and N _i represents the number of turns of the i-th winding coil.

The calculation of the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and the resistance matrix of the dry-type smoothing reactor includes:

Determine the equivalent circuit equation of the dry-type smoothing reactor as follows:

(K _R +jωK _L )I=U

Among them, K _R represents the resistance matrix of the dry-type smoothing reactor, K _L represents the inductance matrix of the dry-type smoothing reactor, and L _1,1 ,..., L _n,n represent the self-inductance of each winding coil; M _1,2 ,..., M _1,n and M _2,1 ,..., M _n,1 represent the mutual inductance between the winding coils; ω represents the angular frequency; j represents the imaginary number unit; U represents the voltage of the dry-type smoothing reactor, and U=[U _L U _L ... U _L ] ^T , U _L represents the voltage of the winding coil; I represents the dry-type smoothing reactor The current matrix of the device, I=[I ₁ I ₂ ... I _i ... I _n ] ^T , I _i represents the current of the i-th winding coil;

According to (K _R +jωK _L )I=U, I _L =P ^T I and U=PU _L , get (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^{- 1} I _L , P represents an n-dimensional column vector, each element of which is 1; _IL represents the current of the dry-type smoothing reactor, and I _L =I ₁ +I ₂ +…+I _i +…+I _n ;

When the DC current flows through the dry-type smoothing reactor, (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 _IL in ω=0, the dry-type smoothing reactor The surge reactor divides the current according to the resistance; when the harmonic current flows through the dry-type smoothing reactor, (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 I _L Where ω≠0, the dry-type smoothing reactor performs shunting according to the inductance.

According to the AC and DC distribution of the dry-type smoothing reactor, the loss of the dry-type smoothing reactor is calculated according to the following formula:

Wherein, P represents the loss of the dry-type smoothing reactor, P _i represents the resistive loss of the i-th winding coil, and P _i =I _i ² R _i .

On the other hand, the present invention provides a dry-type smoothing reactor loss calculation device based on equal heat flux, the dry-type smoothing reactor includes n parallel winding coils, and the loss calculation device includes:

The first determination module is used to determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

The second determination module is used to calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and the resistance matrix of the dry-type smoothing reactor;

The loss calculation module is used to calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor.

The first determination module includes:

The inductance matrix determination unit is used to determine the inductance matrix of the dry-type smoothing reactor through the Bartky transformation method or the finite element simulation method.

The first determination module includes:

The resistance matrix determination unit is used to determine the resistance matrix of the dry-type smoothing reactor by the following formula:

Among them, K _R represents the resistance matrix of the dry-type smoothing reactor, which is a diagonal matrix; R _i represents the resistance of the i-th winding coil, and Δt represents the average temperature rise of the wire, _ρ0 represents the resistivity of the wire, α represents the temperature coefficient, a represents the filling factor, S _i represents the wire cross-sectional area of the i-th winding coil, l _i represents the wire length of the i-th winding coil ,and H _i represents the height of the i-th winding coil, r _i represents the radius of the i-th winding coil, and N _i represents the number of turns of the i-th winding coil.

The second determination module includes:

The equivalent circuit equation determination unit is used to determine the equivalent circuit equation of the dry-type smoothing reactor, and according to the equivalent circuit equation of the dry-type smoothing reactor, I _L =P ^TI and U=PU _L , get ( K _R +jωK _L )I＝P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 I _L ; the equivalent circuit equation of the dry smoothing reactor is (K _R +jωK _L )I＝ U, K _L represent the inductance matrix of the dry-type smoothing reactor, and L _1,1 ,..., L _n,n represent the self-inductance of each winding coil; M _1,2 ,..., M _1,n and M _2,1 ,..., M _n , ₁ represent the mutual inductance between the winding coils; ω represents the angular frequency; j represents the imaginary number unit; U represents the voltage of the dry-type smoothing reactor, and U=[U _L U _L ... U _L ] ^T , U _L represents the voltage of the winding coil; I represents the dry-type smoothing reactor The current matrix of the device, I=[I ₁ I ₂ ... I _i ... _In ] ^T , I _i represents the current of the i-th winding coil; P represents an n-dimensional column vector, each element of which is 1; I _L Indicates the current of the dry-type smoothing reactor, and I _L =I ₁ +I ₂ +…+I _i +…+I _n ;

The AC and DC distribution determination unit is used to divide the dry-type smoothing reactor according to the resistance when the DC current flows through the dry-type smoothing reactor. When the harmonic current flows through the dry-type smoothing reactor, the dry-type smoothing reactor The reactor shunts the current according to the inductance,

The loss calculation module is specifically used for:

According to the AC and DC distribution of the dry-type smoothing reactor, the loss of the dry-type smoothing reactor is calculated according to the following formula:

Wherein, P represents the loss of the dry-type smoothing reactor, P _i represents the resistive loss of the i-th winding coil, and P _i =I _i ² R _i .

In another aspect, the present invention also provides a dry-type smoothing reactor loss evaluation method, including:

Calculate the loss of dry type smoothing reactor loss;

The losses of dry smoothing reactors are evaluated based on constant heat flux and loss thresholds.

The evaluation of the loss of the dry-type smoothing reactor based on the equal heat flux density and the loss threshold includes:

Judging whether P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time, the dry-type smoothing reactor meets the requirements; otherwise, adjust the number of turns of each winding coil and the cross-sectional area of the wire, and recalculate each winding coil The resistive loss of the dry-type smoothing reactor and the loss of the dry-type smoothing reactor until P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time;

Among them, P _set1 represents the loss threshold of the dry-type smoothing reactor, P _set2 represents the resistive loss difference threshold of the winding coils, and P _i-1 represents the resistive loss of i winding coils.

In another aspect, the present invention also provides a dry-type smoothing reactor loss evaluation device, including:

loss calculation device;

Evaluation module for the evaluation of losses in dry smoothing reactors based on constant heat flux and loss thresholds.

The evaluation modules are used specifically for:

Judging whether P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time, the dry-type smoothing reactor meets the requirements; otherwise, adjust the number of turns of each winding coil and the cross-sectional area of the wire, and recalculate each winding coil The resistive loss of the dry-type smoothing reactor and the loss of the dry-type smoothing reactor until P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time; where, P _set1 represents the loss threshold of the dry-type smoothing reactor , P _set2 represents the resistive loss difference threshold of the winding coils, and P _i-1 represents the resistive loss of the i winding coils.

Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

In the dry type smoothing reactor loss calculation method based on equal heat flux density provided by the present invention, the inductance matrix and resistance matrix of the dry type smoothing reactor are first determined, and then calculated according to the inductance matrix and resistance matrix of the dry type smoothing reactor The AC and DC distribution of the dry-type smoothing reactor, and finally calculate the loss of the dry-type smoothing reactor according to the AC-DC distribution of the dry-type smoothing reactor, and the calculated loss of the dry-type smoothing reactor has high accuracy; The dry-type smoothing reactor loss calculation device based on equal heat flux provided by the invention includes a first determination module, a second determination module and a loss calculation module. The first determination module is used to determine the inductance matrix and resistance of the dry-type smoothing reactor Matrix, the second determination module is used to calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and resistance matrix of the dry-type smoothing reactor, and the loss calculation calculates the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor. The loss of wave reactor, the calculated loss result of dry type smoothing reactor has high accuracy;

In the dry-type smoothing reactor loss evaluation method based on equal heat flux provided by the present invention, the loss of the dry-type smoothing reactor is calculated first, and then the loss of the dry-type smoothing reactor is evaluated based on the equal heat flux and the loss threshold , to realize the lightweight and low cost of the dry-type smoothing reactor;

The dry-type smoothing reactor loss evaluation device based on equal heat flux provided by the present invention includes a loss calculation device and an evaluation module. The loss threshold evaluates the loss of the dry-type smoothing reactor, which realizes the lightweight and low cost of the dry-type smoothing reactor.

Description of drawings

Fig. 1 is a schematic diagram of an equivalent circuit model of a dry-type smoothing reactor in the prior art;

Fig. 2 is a flowchart of a method for calculating the loss of a dry-type smoothing reactor in Embodiment 1 of the present invention;

Fig. 3 is a flow chart of a loss evaluation method for a dry-type smoothing reactor in Embodiment 2 of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Example 1

Embodiment 1 of the present invention provides a method for calculating the loss of a dry-type smoothing reactor based on equal heat flux, wherein the dry-type smoothing reactor includes n parallel winding coils, and the dry-type smoothing reactor provided by Embodiment 1 of the present invention The specific flow chart of the reactor loss calculation method is shown in Figure 2, and the specific process is as follows:

S101: Determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

S102: Calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and resistance matrix of the dry-type smoothing reactor;

S103: Calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor.

In S101, the inductance matrix of the dry-type smoothing reactor is determined by the Bartky transformation method or the finite element simulation method, and the resistance matrix of the dry-type smoothing reactor is determined by the following formula:

Among them, K _R represents the resistance matrix of the dry-type smoothing reactor, which is a diagonal matrix; R _i represents the resistance of the i-th winding coil, and Δt represents the average temperature rise of the wire, _ρ0 represents the resistivity of the wire, α represents the temperature coefficient, a represents the filling factor, S _i represents the wire cross-sectional area of the i-th winding coil, l _i represents the wire length of the i-th winding coil ,and H _i represents the height of the i-th winding coil, r _i represents the radius of the i-th winding coil, and N _i represents the number of turns of the i-th winding coil.

In the above S102, the AC and DC distribution of the dry-type smoothing reactor is calculated according to the inductance matrix and resistance matrix of the dry-type smoothing reactor, and the specific process is as follows:

1) Determine the equivalent circuit equation of the dry-type smoothing reactor as follows:

(K _R +jωK _L )I=U

Among them, K _L represents the inductance matrix of the dry-type smoothing reactor, and L _1,1 ,..., L _n,n represent the self-inductance of each winding coil; M _1,2 ,..., M _1,n and M _2,1 ,..., M _n,1 represent the mutual inductance between the winding coils; ω represents the angular frequency; j represents the imaginary number unit; U represents the voltage of the dry-type smoothing reactor, and U=[U _L U _L ... U _L ] ^T , U _L represents the voltage of the winding coil; I represents the dry-type smoothing reactor The current matrix of the device, I=[I ₁ I ₂ ... I _i ... I _n ] ^T , I _i represents the current of the i-th winding coil;

2) According to (K _R +jωK _L )I=U, I _L =P ^T I and U=PU _L , get (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P } ^{- 1} I _L , P represents an n-dimensional column vector, each element of which is 1; _IL represents the current of the dry-type smoothing reactor, and I _L =I ₁ +I ₂ +…+I _i +… +I _n ;

3) When the DC current flows through the dry-type smoothing reactor, since (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 _IL in ω=0, The dry-type smoothing reactor divides the current according to the resistance; when the harmonic current flows through the dry-type smoothing reactor, since (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ω≠0 in ^-1 I _L , the dry type smoothing reactor performs shunting according to the inductance.

The specific process of the above S103 is as follows:

1) According to the AC and DC distribution of the dry-type smoothing reactor, calculate the loss of the dry-type smoothing reactor according to the following formula:

Wherein, P represents the loss of the dry-type smoothing reactor, P _i represents the resistive loss of the i-th winding coil, and P _i =I _i ² R _i .

Based on the same inventive concept as the calculation method of the present invention, Embodiment 1 of the present invention also provides a dry-type smoothing reactor loss calculation device, wherein the dry-type smoothing reactor includes n winding coils connected in parallel, based on the equal heat flux density The dry-type smoothing reactor loss calculation device specifically includes:

The first determination module is used to determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

The second determination module is used to calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and the resistance matrix of the dry-type smoothing reactor;

The loss calculation module is used to calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor.

The above-mentioned first determination module includes:

1) An inductance matrix determining unit, used to determine the inductance matrix of the dry-type smoothing reactor through the Bartky transformation method or the finite element simulation method.

2) The resistance matrix determination unit is used to determine the resistance matrix of the dry-type smoothing reactor through the following formula:

Among them, K _R represents the resistance matrix of the dry-type smoothing reactor, which is a diagonal matrix; R _i represents the resistance of the i-th winding coil, and Δt represents the average temperature rise of the wire, _ρ0 represents the resistivity of the wire, α represents the temperature coefficient, a represents the filling factor, S _i represents the wire cross-sectional area of the i-th winding coil, l _i represents the wire length of the i-th winding coil ,and H _i represents the height of the i-th winding coil, r _i represents the radius of the i-th winding coil, and N _i represents the number of turns of the i-th winding coil.

The above-mentioned second determination module specifically includes:

1) The equivalent circuit equation determination unit is used to determine the equivalent circuit equation of the dry-type smoothing reactor, and according to the equivalent circuit equation of the dry-type smoothing reactor, I _L =P ^TI and U=PU _L , Get (K _R +jωK _L )I＝P{P ^T (K _R +jωK _L ) ^-1 P} ^{- 1} I _L ; where the equivalent circuit equation of the dry-type smoothing reactor is (K _R +jωK _L ) I=U, K _L represents the inductance matrix of the dry-type smoothing reactor, and L _1,1 ,..., L _n,n represent the self-inductance of each winding coil; M _1,2 ,..., M _1,n and M _2,1 ,..., M _n,1 represent the mutual inductance between the winding coils; ω represents the angular frequency; j represents the imaginary number unit; U represents the voltage of the dry-type smoothing reactor, and U=[U _L U _L ... U _L ] ^T , U _L represents the voltage of the winding coil; I represents the dry-type smoothing reactor The current matrix of the device, I=[I ₁ I ₂ ... I _i ... _In ] ^T , I _i represents the current of the i-th winding coil; P represents an n-dimensional column vector, each element of which is 1; I _L Indicates the current of the dry-type smoothing reactor, and I _L =I ₁ +I ₂ +…+I _i +…+I _n ;

2) The AC and DC distribution determination unit is used for when the DC current flows through the dry-type smoothing reactor, since (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 ω=0 in I _L , the dry-type smoothing reactor shunts according to the resistance; when the harmonic current flows through the dry-type smoothing reactor, because (K _R +jωK _L )I=P{P ^T (K _R +jωK _L ) ^-1 P} ^-1 I _L in ω≠0, the dry-type smoothing reactor is shunted according to the inductance.

The above loss calculation module is based on the AC and DC distribution of the dry-type smoothing reactor, and calculates the loss of the dry-type smoothing reactor according to the following formula:

Wherein, P represents the loss of the dry-type smoothing reactor, P _i represents the resistive loss of the i-th winding coil, and P _i =I _i ² R _i .

Example 2

Embodiment 2 of the present invention provides a dry-type smoothing reactor loss evaluation method, as shown in Figure 3, including the following steps:

S201: Determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

S202: Calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and resistance matrix of the dry-type smoothing reactor;

S203: Calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor;

S204: Evaluate the loss of the dry-type smoothing reactor based on the equal heat flux density and the loss threshold.

The specific implementation method of above-mentioned S201, S202, S203 is the same as S101, S102, S103 in embodiment 1.

In the above S204, based on the equal heat flux and loss threshold, the loss of the dry-type smoothing reactor is evaluated according to the following process, the specific process is:

Judging whether P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time, the dry-type smoothing reactor meets the requirements; otherwise, adjust the number of turns of each winding coil and the cross-sectional area of the wire, and recalculate each winding coil The resistive loss of the dry-type smoothing reactor and the loss of the dry-type smoothing reactor until P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time; where, P _set1 represents the loss threshold of the dry-type smoothing reactor , P _set2 represents the resistive loss difference threshold of the winding coils, and P _i-1 represents the resistive loss of the i winding coils.

Based on the same inventive concept as the evaluation method of the present invention, Embodiment 2 of the present invention also provides a dry-type smoothing reactor loss evaluation device, including:

The first determination module is used to determine the inductance matrix and resistance matrix of the dry-type smoothing reactor;

The second determination module is used to calculate the AC and DC distribution of the dry-type smoothing reactor according to the inductance matrix and the resistance matrix of the dry-type smoothing reactor;

The loss calculation module is used to calculate the loss of the dry-type smoothing reactor according to the AC and DC distribution of the dry-type smoothing reactor;

The evaluation module is used to judge whether P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time, and the dry-type smoothing reactor meets the requirements; otherwise, adjust the number of turns of each winding coil and the cross-sectional area of the wire, and Recalculate the resistive loss of each winding coil and the loss of the dry-type smoothing reactor until P≤P _set1 and |P _i -P _i-1 |≤P _set2 are satisfied at the same time; where, P _set1 means dry-type smoothing The loss threshold of the reactor, P _set2 represents the resistive loss difference threshold of the winding coils, and P _i-1 represents the resistive loss of the i winding coils.

The specific implementation manners of the above-mentioned first determination module, second determination module and loss calculation module are the same as those of the modules in Embodiment 1.

The technical solution provided by the invention can accurately calculate the resistive loss of the winding coils of each layer of the dry-type smoothing reactor, and does not need to ensure the dry-type smoothing reactor by increasing the temperature rise margin and increasing the DC current in the temperature rise test. Safety, avoiding the increased cost of insulating materials and requiring fewer wires;

The technical solution provided by the invention solves the problem of heat dissipation and temperature rise control of the dry smoothing reactor in a limited space under natural circulation conditions, thereby greatly reducing the accident probability of the dry smoothing reactor caused by excessive temperature rise, The reactor is guaranteed to run stably, reliably and uninterruptedly.

For the convenience of description, each part of the device described above is divided into various modules or units by function and described separately. Of course, when implementing the present application, the functions of each module or unit can be implemented in one or more pieces of software or hardware.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those of ordinary skill in the art can still modify or equivalently replace the specific implementation methods of the present invention with reference to the above embodiments. Any modifications or equivalent replacements departing from the spirit and scope of the present invention are within the protection scope of the claims of the pending application of the present invention.

Claims (14)

1. a kind of dry smoothing reactor loss computing method, the dry smoothing reactor includes n winding coil in parallel, It is characterized in that, the loss computing method includes：

Determine the inductance matrix and resistor matrix of dry smoothing reactor；

The alternating current-direct current distribution of dry smoothing reactor is calculated according to the inductance matrix of dry smoothing reactor and resistor matrix；

The loss for calculating dry smoothing reactor is distributed according to the alternating current-direct current of dry smoothing reactor.

2. dry smoothing reactor loss computing method according to claim 1, which is characterized in that the flat wave electricity of dry type The inductance matrix of anti-device is determined by Bartky converter techniques or finite element simulation method.

3. dry smoothing reactor loss computing method according to claim 1, which is characterized in that the flat wave electricity of dry type The resistor matrix of anti-device is determined by following formula：

Wherein, K_RThe resistor matrix for indicating dry smoothing reactor, is diagonal matrix；R_iIndicate the electricity of i-th of winding coil Resistance, andΔ t indicates conducting wire average temperature rising, ρ₀Indicate that the resistivity of conducting wire, α indicate temperature coefficient, a tables Show fill factor, S_iIndicate the wire sectional area of i-th of winding coil, l_iIndicate the conductor length of i-th of winding coil, andH_iIndicate the height of i-th of winding coil, r_iIndicate the radius of i-th of winding coil, N_iIndicate the The number of turns of i winding coil.

4. dry smoothing reactor loss computing method according to claim 1, which is characterized in that described flat according to dry type The alternating current-direct current of inductance matrix and resistor matrix the calculating dry smoothing reactor of wave reactor, which is distributed, includes：

Determine the Equivalent circuit equations of the dry smoothing reactor such as following formula：

(K_R+jωK_L) I=U

Wherein, K_RIndicate the resistor matrix of dry smoothing reactor, K_LIndicate the inductance matrix of dry smoothing reactor, andL_1,1、…、L_n,nIndicate the self-induction of each winding coil；M_1,2、…、M_1,nAnd M_2,1、…、M_n,1 Indicate the mutual inductance between winding coil；ω indicates angular frequency；J indicates imaginary unit；U indicates the voltage of dry smoothing reactor, And U=[U_L U_L … U_L]^T, U_LIndicate the voltage of winding coil；I indicates the current matrix of dry smoothing reactor, I=[I₁ I₂ … I_i … I_n]^T, I_iIndicate the electric current of i-th of winding coil；

According to (K_R+jωK_L) I=U, I_L=P^TI and U=PU_L, obtain (K_R+jωK_L) I=P { P^T(K_R+jωK_L)^-1P}^-1I_L, P tables Show that n dimensional vectors, each element therein are 1；I_LIndicate the electric current of dry smoothing reactor, and I_L=I₁+I₂+…+I_i+… +I_n；

When DC current flows through dry smoothing reactor, (K_R+jωK_L) I=P { P^T(K_R+jωK_L)^-1P}^-1I_LIn ω=0, Dry smoothing reactor is shunted according to resistance；When harmonic current flows through dry smoothing reactor, (K_R+jωK_L) I=P {P^T(K_R+jωK_L)^-1P}^-1I_LIn ω ≠ 0, dry smoothing reactor shunted according to inductance.

5. dry smoothing reactor loss computing method according to claim 4, which is characterized in that according to the flat wave electricity of dry type The alternating current-direct current of anti-device is distributed, and the loss of dry smoothing reactor is calculated as follows：

Wherein, P indicates the loss of dry smoothing reactor, P_iIndicate the resistive loss of i-th of winding coil, and P_i=I_i ²R_i。

6. a kind of dry smoothing reactor loss calculation device, the dry smoothing reactor includes n winding coil in parallel, It is characterized in that, the loss calculation device includes：

First determining module, inductance matrix and resistor matrix for determining dry smoothing reactor；

Second determining module, for calculating dry smoothing reactor according to the inductance matrix and resistor matrix of dry smoothing reactor Alternating current-direct current distribution；

Loss calculation module, for being distributed the loss for calculating dry smoothing reactor according to the alternating current-direct current of dry smoothing reactor.

7. dry smoothing reactor loss calculation device according to claim 6, which is characterized in that described first determines mould Block includes：

Inductance matrix determination unit, the electricity for determining dry smoothing reactor by Bartky converter techniques or finite element simulation method Feel matrix.

8. dry smoothing reactor loss calculation device according to claim 6, which is characterized in that described first determines mould Block includes：

Resistor matrix determination unit, the resistor matrix for determining dry smoothing reactor by following formula：

Wherein, K_RThe resistor matrix for indicating dry smoothing reactor, is diagonal matrix；R_iIndicate the electricity of i-th of winding coil Resistance, andΔ t indicates conducting wire average temperature rising, ρ₀Indicate that the resistivity of conducting wire, α indicate temperature coefficient, a tables Show fill factor, S_iIndicate the wire sectional area of i-th of winding coil, l_iIndicate the conductor length of i-th of winding coil, andH_iIndicate the height of i-th of winding coil, r_iIndicate the radius of i-th of winding coil, N_iIndicate the The number of turns of i winding coil.

9. dry smoothing reactor loss calculation device according to claim 8, which is characterized in that described second determines mould Block includes：

Equivalent circuit equations determination unit, the Equivalent circuit equations for determining dry smoothing reactor, and according to the flat wave of dry type Equivalent circuit equations, the I of reactor_L=P^TI and U=PU_L, obtain (K_R+jωK_L) I=P { P^T(K_R+jωK_L)^-1P}^-1I_L；Wherein The Equivalent circuit equations of dry smoothing reactor are (K_R+jωK_L) I=U, K_LIndicate the inductance matrix of dry smoothing reactor, andL_1,1、…、L_n,nIndicate the self-induction of each winding coil；M_1,2、…、M_1,nAnd M_2,1、…、M_n,1 Indicate the mutual inductance between winding coil；ω indicates angular frequency；J indicates imaginary unit；U indicates the voltage of dry smoothing reactor, And U=[U_L U_L … U_L]^T, U_LIndicate the voltage of winding coil；I indicates the current matrix of dry smoothing reactor, I=[I₁ I₂ … I_i … I_n]^T, I_iIndicate the electric current of i-th of winding coil；P indicates that n dimensional vectors, each element therein are 1； I_LIndicate the electric current of dry smoothing reactor, and I_L=I₁+I₂+…+I_i+…+I_n；

Alternating current-direct current is distributed determination unit, for when DC current flows through dry smoothing reactor, dry smoothing reactor according to Resistance is shunted, and when harmonic current flows through dry smoothing reactor, dry smoothing reactor is shunted according to inductance.

10. dry smoothing reactor loss calculation device according to claim 9, which is characterized in that the loss calculation Module is specifically used for：

It is distributed according to the alternating current-direct current of dry smoothing reactor, and the loss of dry smoothing reactor is calculated as follows：

Wherein, P indicates the loss of dry smoothing reactor, P_iIndicate the resistive loss of i-th of winding coil, and P_i=I_i ²R_i。

11. appraisal procedure is lost in a kind of dry smoothing reactor, which is characterized in that including：

The loss according to any one of claims 1 to 5 for calculating dry smoothing reactor loss；

Based on etc. heat flow densities and loss threshold value the loss of dry smoothing reactor is assessed.

12. appraisal procedure is lost in dry smoothing reactor according to claim 11, which is characterized in that it is described based on etc. heat Current density and loss threshold value carry out assessment to the loss of dry smoothing reactor and include：

Judge whether to meet P≤P simultaneously_set1With | P_i-P_i-1|≤P_set2, dry smoothing reactor meets the requirements；Otherwise adjustment is each The number of turns and sectional area of wire of a winding coil, and recalculate resistive loss and the flat wave reactance of dry type of each winding coil The loss of device, until meeting P≤P simultaneously_set1With | P_i-P_i-1|≤P_set2Until；

Wherein, P_set1Indicate the loss threshold value of dry smoothing reactor, P_set2Indicate the resistive loss difference threshold of winding coil Value, P_i-1Indicate the resistive loss of i winding coil.

13. apparatus for evaluating is lost in a kind of dry smoothing reactor, which is characterized in that including：

Loss calculation device as described in claim 6-10 is any；

Evaluation module, for based on etc. heat flow densities and loss threshold value the loss of dry smoothing reactor is assessed.

14. apparatus for evaluating is lost in dry smoothing reactor according to claim 13, which is characterized in that the assessment mould Block is specifically used for：

Judge whether to meet P≤P simultaneously_set1With | P_i-P_i-1|≤P_set2, dry smoothing reactor meets the requirements；Otherwise adjustment is each The number of turns and sectional area of wire of a winding coil, and recalculate resistive loss and the flat wave reactance of dry type of each winding coil The loss of device, until meeting P≤P simultaneously_set1With | P_i-P_i-1|≤P_set2Until；Wherein, P_set1Indicate dry smoothing reactor Threshold value, P is lost_set2Indicate the resistive loss difference threshold of winding coil, P_i-1Indicate the resistive loss of i winding coil.