阅读说明：本技术 Lcl滤波器参数的设计方法和系统 (method and system for designing parameters of L C L filter ) 是由 何承曾 唐锋 于 2020-04-17 设计创作，主要内容包括：本申请涉及一种LCL滤波器参数的设计方法和系统。所述方法包括：获取整流电路输入侧的输入参数,所述整流电路输入侧与变频器相连,所述输入参数包括来自变频器的反馈电压和载波频率；获取基准参数,所述基准参数包括第一压降占比和第二压降占比；根据所述输入参数和基准参数,计算得到与所述变频器匹配的目标参数,所述目标参数包括第一电感参数、第二电感参数和目标电容参数。基于上述方法,根据变频器的参数确定与其匹配的目标参数,根据目标参数选择市面上对应参数的LCL滤波器,或根据目标参数定制LCL滤波器,提高了应用系统的稳定性和抗干扰能力。(the method comprises the steps of obtaining input parameters of an input side of a rectifying circuit, wherein the input parameter comprises feedback voltage and carrier frequency from a frequency converter, obtaining reference parameters, wherein the reference parameters comprise a first voltage drop ratio and a second voltage drop ratio, calculating target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter.)

1. a method for designing parameters of an lc L filter, the method comprising:

Acquiring input parameters of an input side of a rectifying circuit, wherein the input side of the rectifying circuit is connected with a frequency converter, the input parameters comprise feedback voltage and carrier frequency from the frequency converter, and the carrier frequency is the product of power frequency and a first preset multiple;

Acquiring reference parameters, wherein the reference parameters comprise a first pressure drop ratio and a second pressure drop ratio;

And calculating to obtain target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, and the rectifying circuit is composed of a first reactor corresponding to the first inductance parameter, a second reactor corresponding to the second inductance parameter and a capacitor group connected between the first reactor and the second reactor corresponding to the target capacitance parameter.

2. The method of claim 1, wherein the reference parameter further comprises a predetermined constant, and wherein generating the first inductance parameter according to the input parameter and the reference parameter comprises:

Acquiring the preset constant formula, wherein the preset constant formula comprises the product of a preset constant and power frequency;

And calculating the product of the feedback voltage and the first voltage drop ratio to obtain a first product, and calculating the ratio of the first product to the preset constant expression to obtain the first inductance parameter.

3. The method of claim 1, wherein the reference parameter further comprises a predetermined constant, and wherein generating a second inductance parameter according to the input parameter and the reference parameter comprises:

Acquiring the preset constant formula, wherein the preset constant formula comprises the product of a preset constant and power frequency;

And calculating the product of the feedback voltage and the second voltage drop ratio to obtain a second product, and calculating the ratio of the second product to the preset constant expression to obtain the second inductance parameter.

4. The method of claim 3, wherein the reference parameters further include a resonant frequency, and wherein calculating a target capacitance parameter from the input parameters and the reference parameters comprises:

Acquiring a resonant frequency, wherein the resonant frequency is greater than a first preset frequency, the first preset frequency is the product of a power frequency and a second preset multiple, and the second preset multiple is greater than or equal to 10;

And calculating to obtain the target capacitance parameter according to the resonance frequency, the first inductance parameter and the second inductance parameter.

5. The method of claim 4, wherein the resonant frequency is less than a second predetermined frequency, the second predetermined frequency is a product of the carrier frequency and a third predetermined multiple, the third predetermined multiple is less than 1, and the second predetermined frequency is greater than the first predetermined frequency.

6. The method of claim 5, wherein calculating the target capacitance parameter according to the resonant frequency, the first inductance parameter, and the second inductance parameter comprises:

Obtaining a plurality of candidate capacitance parameters according to the resonance frequency, the first inductance parameter and the second inductance parameter;

Obtaining corresponding candidate resonant frequency according to the candidate capacitance parameter;

Calculating a difference value between the candidate resonant frequency and the second preset frequency to obtain a corresponding frequency difference value;

And screening the candidate frequency corresponding to the minimum frequency difference value as a target resonance frequency, and taking the candidate capacitance parameter corresponding to the target resonance frequency as a target capacitance parameter.

7. The method according to any one of claims 1-5, wherein the obtaining the reference parameter comprises:

Obtaining a data sample comprising a plurality of data pairs, each data pair comprising a first estimated proportion and a corresponding second estimated proportion;

Calculating to obtain an influence parameter according to each data pair;

Judging whether each influence parameter meets a preset condition or not;

And taking the data pairs meeting preset conditions as the reference parameters.

8. a system for designing parameters for an L C L filter, the system comprising:

the L C L filter is used for filtering electric energy transmitted between the power grid and the frequency converter, and comprises a rectifying circuit, wherein the rectifying circuit is composed of a first reactor, a second reactor and a capacitor bank connected between the first reactor and the second reactor;

the frequency converter is used for receiving the electric energy filtered by the L filter, sending the electric energy to electric equipment, and transmitting feedback electric energy generated by power generation equipment to a power grid through the L filter;

and the parameter calculation device is used for generating target parameters matched with the frequency converter according to the parameters of the frequency converter and selecting the LCL filter matched with the frequency converter according to the target parameters.

9. The system of claim 8, wherein the parameter calculating means comprises:

The input parameter acquisition module is used for acquiring input parameters of an input side of the rectifying circuit, the input side of the rectifying circuit is connected with the frequency converter, the input parameters comprise feedback voltage and carrier frequency from the frequency converter, and the carrier frequency is the product of power frequency and a first preset multiple;

The reference parameter acquisition module is used for acquiring reference parameters, and the reference parameters comprise a first pressure drop ratio and a second pressure drop ratio;

And the calculation module is used for calculating target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, and the first inductance parameter, the second inductance parameter and the target capacitance parameter are respectively in one-to-one correspondence with the first reactor, the second reactor and the capacitor bank in the rectification circuit.

10. The system of claim 9, wherein the reference parameters further comprise a predetermined constant, and the calculation module comprises:

The first constant obtaining unit is used for obtaining the preset constant formula, and the preset constant formula comprises a product of a preset constant and power frequency;

The first inductance calculation unit is configured to calculate a product of the feedback voltage and the first voltage drop ratio to obtain a first product, and calculate a ratio of the first product to the preset constant to obtain the first inductance parameter.

Technical Field

the present application relates to the field of electronic technologies, and in particular, to a method and a system for designing parameters of an lc L filter.

Background

Most of common frequency converters convert alternating current into direct current by adopting a diode rectifier bridge, and then convert the direct current into alternating current with adjustable voltage and frequency by adopting an IGBT (insulated gate bipolar transistor) inversion technology to control an alternating current motor. The frequency converter can only work in an electric state, so the frequency converter is called a two-quadrant frequency converter. Because the two-quadrant frequency converter adopts the diode rectifier bridge, the bidirectional flow of energy can not be realized, and the energy of a motor feedback system can not be sent back to a power grid. In some applications of motors needing energy feedback, such as elevators, hoists, centrifuge systems, oil pumping units and the like, a resistance braking unit can be added on a two-quadrant frequency converter only, so that the energy fed back by the motors is consumed. In addition, the diode rectifier bridge can cause serious harmonic pollution to the power grid.

The four-quadrant frequency converter meets various industrial application requirements, is particularly suitable for large-inertia potential energy loads such as hoisting and lifting equipment, has large rotational inertia GD of the equipment, belongs to a repeated short-time continuous working system, has large deceleration and amplitude reduction from high speed to low speed, has short braking time and needs a strong braking effect or needs long-time heavy-load electric braking. In order to improve the electricity-saving effect and reduce the energy loss in the braking process, the deceleration energy is recycled and fed back to the power grid, and the effects of energy conservation and environmental protection are achieved.

the L C L filter is an important accessory of a four-quadrant frequency converter, which exerts excellent performance, meets national and industrial standards such as coal industry standard MT/T1099-2009 of the people's republic of China and GB/T14549-93 electric energy quality public power grid harmonic wave, mainly solves the problem of grid-connected harmonic voltage, converts PWM voltage waveform fed back to a power grid into sine wave, reduces interference of voltage harmonic wave to the power grid, and ensures high-reliability operation of core electric transmission mechanisms such as a frequency converter core.

the four-quadrant frequency converter in the market has more application faults, is easy to be interfered by harmonic waves and shut down, particularly is a high-power product, has long EMC test period and more times of rectification, and is mainly because the parameter design of an accessory L C L filter and the frequency converter are integrated integrally and are not optimized, so that the selection of the L C L filter matched with the frequency converter is very important.

Disclosure of Invention

in order to solve the above technical problem, the present application provides a method and a system for designing parameters of an lc L filter.

in a first aspect, the present application provides a method for designing parameters of an lc L filter, including:

Acquiring input parameters of an input side of a rectifying circuit, wherein the input side of the rectifying circuit is connected with a frequency converter, the input parameters comprise feedback voltage and carrier frequency from the frequency converter, and the carrier frequency is the product of power frequency and a first preset multiple;

Acquiring reference parameters, wherein the reference parameters comprise a first pressure drop ratio and a second pressure drop ratio;

And calculating to obtain target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, and the rectifying circuit is composed of a first reactor corresponding to the first inductance parameter, a second reactor corresponding to the second inductance parameter and a capacitor group connected between the first reactor and the second reactor corresponding to the target capacitance parameter.

Optionally, the reference parameter further includes a preset constant, and the generating a first inductance parameter according to the input parameter and the reference parameter includes:

Acquiring the preset constant formula, wherein the preset constant formula comprises the product of a preset constant and power frequency;

And calculating the product of the feedback voltage and the first voltage drop ratio to obtain a first product, and calculating the ratio of the first product to the preset constant expression to obtain the first inductance parameter.

Optionally, the reference parameter further includes a preset constant, and the generating a second inductance parameter according to the input parameter and the reference parameter includes:

Acquiring the preset constant formula, wherein the preset constant formula comprises the product of a preset constant and power frequency;

And calculating the product of the feedback voltage and the second voltage drop ratio to obtain a second product, and calculating the ratio of the second product to the preset constant expression to obtain the second inductance parameter.

Optionally, the reference parameter further includes a resonant frequency, and the calculating according to the input parameter and the reference parameter to obtain the target capacitance parameter includes:

Acquiring a resonant frequency, wherein the resonant frequency is greater than a first preset frequency, the first preset frequency is the product of a power frequency and a second preset multiple, and the second preset multiple is greater than or equal to 10;

And calculating to obtain the target capacitance parameter according to the resonance frequency, the first inductance parameter and the second inductance parameter.

Optionally, the resonant frequency is smaller than a second preset frequency, the second preset frequency is a product of the carrier frequency and a third preset multiple, the third preset multiple is smaller than 1, and the second preset frequency is greater than the first preset frequency.

Optionally, the calculating the target capacitance parameter according to the resonant frequency, the first inductance parameter, and the second inductance parameter includes:

Obtaining a plurality of candidate capacitance parameters according to the resonance frequency, the first inductance parameter and the second inductance parameter;

Obtaining corresponding candidate resonant frequency according to the candidate capacitance parameter;

Calculating a difference value between the candidate resonant frequency and the second preset frequency to obtain a corresponding frequency difference value;

And screening the candidate frequency corresponding to the minimum frequency difference value as a target resonance frequency, and taking the candidate capacitance parameter corresponding to the target resonance frequency as a target capacitance parameter.

Optionally, the obtaining the reference parameter includes:

Obtaining a data sample comprising a plurality of data pairs, each data pair comprising a first estimated proportion and a corresponding second estimated proportion;

Calculating to obtain an influence parameter according to each data pair;

Judging whether each influence parameter meets a preset condition or not;

And taking the data pairs meeting preset conditions as the reference parameters.

in a second aspect, the present embodiment provides a system for designing parameters of an lc L filter, the system comprising:

the L C L filter is used for filtering electric energy transmitted between the power grid and the frequency converter, and comprises a rectifying circuit, wherein the rectifying circuit is composed of a first reactor, a second reactor and a capacitor bank connected between the first reactor and the second reactor;

the frequency converter is used for receiving the electric energy filtered by the L filter, sending the electric energy to electric equipment, and transmitting feedback electric energy generated by power generation equipment to a power grid through the L filter;

and the parameter calculation device is used for generating target parameters matched with the frequency converter according to the parameters of the frequency converter and selecting the LCL filter matched with the frequency converter according to the target parameters.

Optionally, the parameter calculation means comprises:

The input parameter acquisition module is used for acquiring input parameters of an input side of the rectifying circuit, the input side of the rectifying circuit is connected with the frequency converter, the input parameters comprise feedback voltage and carrier frequency from the frequency converter, and the carrier frequency is the product of power frequency and a first preset multiple;

The reference parameter acquisition module is used for acquiring reference parameters, and the reference parameters comprise a first pressure drop ratio and a second pressure drop ratio;

And the calculation module is used for calculating target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, and the first inductance parameter, the second inductance parameter and the target capacitance parameter are respectively in one-to-one correspondence with the first reactor, the second reactor and the capacitor bank in the rectification circuit.

Optionally, the reference parameter further includes a preset constant, and the calculating module includes:

The first constant obtaining unit is used for obtaining the preset constant formula, and the preset constant formula comprises a product of a preset constant and power frequency;

The first inductance calculation unit is configured to calculate a product of the feedback voltage and the first voltage drop ratio to obtain a first product, and calculate a ratio of the first product to the preset constant to obtain the first inductance parameter.

the method comprises the steps of obtaining input parameters of an input side of a rectifying circuit, wherein the input parameter comprises feedback voltage and carrier frequency from a frequency converter, the carrier frequency is the product of power frequency and a first preset multiple, obtaining reference parameters, the reference parameters comprise a first voltage drop ratio and a second voltage drop ratio, calculating target parameters matched with the frequency converter according to the input parameters and the reference parameters, the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, the rectifying circuit comprises a first reactor corresponding to the first inductance parameter, a second reactor corresponding to the second inductance parameter and a capacitor group connected between the first reactor and the second reactor and corresponding to the target capacitance parameter, determining the target parameters matched with the rectifying circuit according to the parameters of the frequency converter under the condition that the parameters of the frequency converter are determined, selecting an L C L filter corresponding to the parameters on the market according to the target parameters, or customizing the L C L filter according to the target parameters, and improving the anti-interference and the anti-interference capability of an application system.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a flow chart illustrating a method for designing parameters of an LcL filter according to an embodiment;

FIG. 2 is a schematic diagram of a rectifier circuit in one embodiment;

FIG. 3 is a graph of the results of one example of an experimental test;

FIG. 4 is a graph of the effect of an experimental test according to one embodiment;

Fig. 5 is a block diagram of a filter parameter processing system according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

in an embodiment, fig. 1 is a schematic flow chart of a method for designing L cl filter parameters in an embodiment, and referring to fig. 1, a method for designing L cl filter parameters is provided.

And S110, acquiring input parameters of an input side of the rectifying circuit, wherein the input side of the rectifying circuit is connected with the frequency converter, the input parameters comprise feedback voltage and carrier frequency from the frequency converter, and the carrier frequency is the product of power frequency and a first preset multiple.

In this embodiment, the first preset multiple is greater than or equal to 40, the frequency converter is selected according to requirements, for example, an ACP30-800KW frequency converter, and the specific value of the power frequency is generally a national standard value of each country, and may also be a value defined by itself.

In a specific embodiment, the power frequency F is 50Hz and the carrier frequency F _wNot less than 2KHz, feedback voltage Wherein U' is the input voltage of the input rectification circuit input side of the frequency converter.

Step S120, obtaining a reference parameter, where the reference parameter includes a first pressure drop ratio and a second pressure drop ratio.

In this embodiment, the first pressure drop proportion and the second pressure drop proportion may be empirical values and analytical values. If a large amount of experimental data are analyzed to obtain reference parameters, and the reference parameters obtained through analysis of the large amount of data can be comprehensively considered for factors of multiple dimensions, such as the factors of the electric energy quality, the output torque of the frequency converter and the like, so that the operation stability of the system adopting the reference parameters is higher.

And step S130, calculating to obtain target parameters matched with the frequency converter according to the input parameters and the reference parameters, wherein the target parameters comprise a first inductance parameter, a second inductance parameter and a target capacitance parameter, and the rectifying circuit is composed of a first reactor corresponding to the first inductance parameter, a second reactor corresponding to the second inductance parameter and a capacitor group connected between the first reactor and the second reactor corresponding to the target capacitance parameter.

in this embodiment, fig. 2 is a schematic diagram of a rectifier circuit in an embodiment, as shown in fig. 2, a first inductance parameter corresponding to a first reactor in the rectifier circuit is L1, a second inductance parameter corresponding to a second reactor is L2, a capacitor bank includes a first resonant capacitor C1, a second resonant capacitor C2, and a third resonant capacitor C3, when three resonant capacitors are connected in a star-like manner, C1-C2-C3-C, when three resonant capacitors are connected in a delta-like manner, and calculating and generating L1, L2 and C according to the input parameters and the reference parameters, thereby determining the parameters or models corresponding to the L C L filter which is most matched with the frequency converter, reducing the interference of voltage harmonics to a power grid, ensuring the normal operation of the whole system, improving the stability of the system in normal operation and realizing the optimization of the L C L filter and the frequency converter in the integral integration.

In one embodiment, the reference parameter further includes a preset constant expression, and the preset constant expression is obtained and includes a product of a preset constant and the power frequency; and dividing the product of the feedback voltage and the first voltage drop ratio by a preset constant expression to generate a first inductance parameter.

Specifically, the predetermined constant is 2 pi F, and the first inductance parameter is:

Wherein A% is the first pressure drop ratio.

In one embodiment, the reference parameter further includes a preset constant expression, and the preset constant expression is obtained and includes a product of a preset constant and the power frequency; and dividing the product of the feedback voltage and the second voltage drop ratio by a preset constant expression to generate a second inductance parameter.

Specifically, the predetermined constant is 2 pi F, and the second inductance parameter is:

Wherein B% is the second pressure drop ratio.

In one embodiment, the reference parameter further includes a resonant frequency, and the resonant frequency is obtained, where the resonant frequency is greater than a first preset frequency, the first preset frequency is a product of a power frequency and a second preset multiple, and the second preset multiple is greater than or equal to 10; and calculating to obtain a target capacitance parameter according to the resonance frequency, the first inductance parameter and the second inductance parameter.

Specifically, the first preset frequency F1 is greater than or equal to 500Hz, the resonant frequency is greater than the first preset frequency, that is, the resonant frequency F' is greater than or equal to 500, and the resonant frequency is:

And calculating to obtain a capacitance parameter C according to the formula, wherein the resonance frequency F' is an interval parameter, so that the generated capacitance parameter corresponds to the interval parameter, namely the capacitance parameter in the interval can be used as a target capacitance parameter.

In one embodiment, the resonant frequency is less than a second predetermined frequency, the second predetermined frequency is a product of the carrier frequency and a third predetermined multiple, the third predetermined multiple is less than 1, and the second predetermined frequency is greater than the first predetermined frequency.

Specifically, the second preset frequency is F2 ═ C × F _w2000 ═ C, third preset multiple C <1, here is set C is 0.5, namely F2 is less than or equal to 1000Hz, the resonant frequency is less than a second preset frequency, namely F' is less than or equal to 500Hz and less than or equal to 1000Hz, the resonant frequency in the interval is calculated according to a large number of test tests and the existing general formula, and the stability of the system in operation is highest.

In one embodiment, a plurality of candidate capacitance parameters are obtained according to the resonance frequency, the first inductance parameter and the second inductance parameter; obtaining corresponding candidate resonant frequency according to the candidate capacitance parameters; calculating a difference value between the candidate resonant frequency and a second preset frequency to obtain a corresponding frequency difference value; and screening the candidate frequency corresponding to the minimum frequency difference value as a target resonance frequency, and taking the candidate capacitance parameter corresponding to the target resonance frequency as a target capacitance parameter.

Specifically, one of the capacitance parameters in the capacitance parameter interval is selected as a target capacitance parameter, the resonance frequency corresponding to each capacitance parameter is a candidate resonance frequency, the closest one of the candidate frequencies to the second preset frequency F2 is taken as the target resonance frequency, the capacitance parameter corresponding to the target resonance frequency is taken as the target capacitance parameter, and the closer the one is to the resonance frequency of the second preset frequency, the higher the stability of the system in operation is, the stronger the anti-interference capability is, the shorter the EMC test period is, and the number of times of rectification is reduced.

and selecting finished products of the L C L filter which are similar to the target capacitance parameter, the first inductance parameter and the second inductance parameter on the market based on cost consideration, and customizing the L C L filter matched with the frequency converter according to the target capacitance parameter, the first inductance parameter and the second inductance parameter if the system operation performance is higher.

fig. 3 is a graph of an experimental test result in one embodiment, fig. 4 is a graph of an experimental test effect in one embodiment, as shown in fig. 3, based on a target capacitance parameter, a first inductance parameter, and a second inductance parameter, 3.1% THD-3-5 th harmonic is obtained, the harmonic of a power grid is obviously improved, and the interference of a system to the power grid is reduced.

In one embodiment, a data sample is obtained comprising a plurality of data pairs, each data pair comprising a first estimated proportion and a corresponding second estimated proportion; calculating to obtain an influence parameter according to each data pair; judging whether the influence parameters meet preset conditions or not; and taking the data pairs meeting the preset conditions as reference parameters.

Specifically, according to a plurality of data pairs, test tests are carried out, influence parameters comprise output torque of the frequency converter, inductance of the reactor, power quality, size of the reactor and the like, when the estimated occupation ratio is larger, the inductance of the reactor is larger, the harmonic content is smaller, and the power quality is higher, but the output torque of the frequency converter is insufficient, the size of the reactor is larger, and the manufacturing cost is higher, so that the reference parameters with the first voltage drop occupation ratio of 4% and the second voltage drop occupation ratio of 8% are obtained through consideration of comprehensive factors and requirements of actual conditions.

it should be understood that although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in the sequence indicated by the arrows, unless explicitly stated herein, the steps may be performed in other sequences as well, and that at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages may not necessarily be performed in sequence, but may be rotated or alternated with at least some of the other steps or sub-steps or stages of the other steps.

in an embodiment, fig. 5 is a block diagram of a filtering parameter processing system in an embodiment, and referring to fig. 5, the embodiment provides a system for designing parameters of an lc L filter, where the system includes:

the lc L filter 210 is configured to filter electric energy transmitted between the power grid and the frequency converter 220, and the lc L filter 210 includes a rectifying circuit, and the rectifying circuit is composed of a first reactor, a second reactor, and a capacitor bank connected between the first reactor and the second reactor;

the frequency converter 220 is configured to receive the electric energy filtered by the lc L filter 210, send the electric energy to an electric device, and transmit feedback electric energy generated by the power generation device to a power grid through the lc L filter 210;

and the parameter processing device 230 is configured to generate a target parameter matched with the frequency converter 220 according to the parameter of the frequency converter 220, and select the lc L filter 210 matched with the frequency converter 220 according to the target parameter.

In one embodiment, the parameter processing device 230 includes:

An input parameter obtaining module, configured to obtain an input parameter at an input side of a rectifier circuit, where the input parameter is connected to the frequency converter 220, the input parameter includes a feedback voltage and a carrier frequency from the frequency converter 220, the carrier frequency is a product of a power frequency and a first preset multiple, and the first preset multiple is greater than or equal to 40;

The reference parameter acquisition module is used for acquiring reference parameters, and the reference parameters comprise a first pressure drop ratio and a second pressure drop ratio;

And the calculation module is configured to calculate a target parameter matched with the frequency converter 220 according to the input parameter and the reference parameter, where the target parameter includes a first inductance parameter, a second inductance parameter, and a target capacitance parameter, and the first inductance parameter, the second inductance parameter, and the target capacitance parameter are in one-to-one correspondence with the first reactor, the second reactor, and the capacitor bank in the rectifier circuit.

In one embodiment, the reference parameter further includes a preset constant, and the calculating module includes:

The first constant acquisition unit is used for acquiring a preset constant expression, and the preset constant expression comprises a product of a preset constant and power frequency;

The first inductance calculating unit is used for dividing the product of the feedback voltage and the first voltage drop ratio by a preset constant expression to generate a first inductance parameter.

In one embodiment, the reference parameter further includes a preset constant, and the calculating module includes:

The second constant obtaining unit is used for obtaining the preset constant formula, and the preset constant formula comprises a product of a preset constant and power frequency;

And the second inductance calculation unit is used for calculating the product of the feedback voltage and the second voltage drop ratio to obtain a second product, and calculating the ratio of the second product to the preset constant expression to obtain the second inductance parameter.

In one embodiment, the reference parameter further includes a resonant frequency, and the calculation module further includes:

The frequency acquisition unit is used for acquiring a resonant frequency, wherein the resonant frequency is greater than a first preset frequency, the first preset frequency is the product of power frequency and a second preset multiple, and the second preset multiple is greater than or equal to 10;

And the capacitance calculating unit is used for calculating the target capacitance parameter according to the resonance frequency, the first inductance parameter and the second inductance parameter.

In one embodiment, the resonant frequency is smaller than a second preset frequency, the second preset frequency is a product of the carrier frequency and a third preset multiple, the third preset multiple is smaller than 1, and the second preset frequency is greater than the first preset frequency.

In one embodiment, the calculation module further comprises:

The candidate parameter calculation unit is used for obtaining a plurality of candidate capacitance parameters according to the resonance frequency, the first inductance parameter and the second inductance parameter;

The candidate frequency acquisition unit is used for acquiring corresponding candidate resonant frequency according to the candidate capacitance parameters;

A difference value calculating unit, configured to calculate a difference value between the candidate resonant frequency and the second preset frequency to obtain a corresponding frequency difference value;

And the target determining unit is used for screening the candidate frequency corresponding to the minimum frequency difference value as a target resonance frequency and taking the candidate capacitance parameter corresponding to the target resonance frequency as a target capacitance parameter.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.