Frequency converter structure optimization method and device and electronic equipment
By adjusting the components in the frequency converter and adding a second component, a physical model was built for simulation testing, which solved the problem of high frequency converter cost and achieved the effect of maintaining stable performance while reducing costs.
Patent Information
- Application Number
- CN202510826593.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-19
- Publication Date
- 2025-11-14
AI Technical Summary
Frequency converters are expensive, and existing technologies struggle to maintain stable performance while reducing costs.
By adjusting the first component in the frequency converter and adding a second component, a physical model is built for simulation testing to ensure that the simulated current is less than or equal to the preset current value, thereby optimizing the frequency converter structure.
While reducing the cost of frequency converters, the performance of the equipment is not affected, thus achieving structural optimization of frequency converters.
Smart Images
Figure CN120951518A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of inverter structure design technology, and in particular to an inverter structure optimization method, device and electronic equipment. Background Technology
[0002] Steel mill rolling mills are machines that change the shape and size of steel raw materials through pressure. They are essential tools in steel mill raw material processing and play a vital role in national production and daily life. The frequency converter in a steel mill is a crucial component for controlling its operation. Close monitoring of electrical energy is necessary during the control process. Normally, the alternating current in the power grid is of a fixed frequency and voltage. By operating the frequency converter, the frequency and voltage can be converted to meet the operating conditions, thereby enabling the control and management of the steel mill rolling mill.
[0003] However, with the increasing market demand, there is a need to further reduce the cost of frequency converters without affecting their functionality. Summary of the Invention
[0004] The purpose of this application is to provide at least one method, apparatus, and electronic device for optimizing the structure of a frequency converter, which can at least solve the above-mentioned problems.
[0005] According to a first aspect of the embodiments of this application, a method for optimizing the structure of a frequency converter is provided, comprising: after adjusting a first component in the frequency converter, constructing a physical model of the frequency converter based on the circuit components in the frequency converter; adding a second component to the circuit where the first component is located in the physical model of the frequency converter based on the circuit parameters of the physical model of the frequency converter to update the physical model of the frequency converter; and determining that the optimization of the frequency converter structure is successful if the simulated current of the updated physical model of the frequency converter is less than or equal to a preset current value.
[0006] Optionally, after adjusting the first component in the inverter, constructing a physical model of the inverter based on the circuit components in the inverter includes: constructing an equivalent circuit of the inverter based on the circuit components in the inverter; applying a sweep current of a preset frequency to the physical model of the inverter to extract the stray inductance parameters of the main circuit of the inverter; and constructing an impedance matrix based on the stray inductance parameters.
[0007] Optionally, the step of adding a second element to the circuit where the first element is located in the physical model of the inverter according to the circuit parameters of the physical model of the inverter to update the physical model of the inverter includes: constructing an inverter impedance model in the updated physical model of the inverter according to the stray inductance parameters and the element parameters of the second element.
[0008] Optionally, after adding a second element to the circuit containing the first element in the physical model of the frequency converter based on the inductance parameters of the frequency converter, the method further includes: performing a reactance impulse test on the updated physical model of the frequency converter according to a preset test plan to obtain the impedance model simulation current corresponding to the impedance model of the frequency converter; performing a reactance impulse test on the frequency converter according to the preset test plan to obtain the actual current of the reactor; if the difference between the impedance model simulation current and the actual current of the reactor is less than a preset current difference threshold, it is determined that the impedance circuit in the updated physical model of the frequency converter is correct.
[0009] Optionally, the step of determining that the inverter structure optimization is successful if the simulated current of the updated inverter physical model is less than or equal to a preset current value includes: monitoring the current of the supporting capacitor in the updated inverter physical model; if the simulated current of the supporting capacitor is less than or equal to a preset current value, the first component is determined to be successfully optimized.
[0010] Optionally, it further includes: if the simulated current is greater than the preset current value, then adjusting the first element; or, if the simulated current is greater than the preset current value, then adjusting the second element.
[0011] Optionally, the first element includes a low-inductance busbar, and the second element includes a capacitor and / or an inductor. Adjusting the first element in the inverter includes: adjusting the low-inductance busbar to a normal busbar, wherein the stray inductance of the low-inductance busbar is lower than a first stray inductance threshold, and the inductance of the normal busbar is greater than a second stray inductance threshold, which is greater than the first stray inductance threshold. Adding a second element to the circuit containing the first element in the inverter's physical model according to the inverter's circuit parameters to update the inverter's physical model includes: adding a capacitor and / or an inductor to the circuit containing the first element according to the circuit parameters.
[0012] According to a second aspect of the embodiments of this application, a frequency converter structure optimization device is also provided, comprising: a first processing module, configured to construct a physical model of the frequency converter based on the circuit elements in the frequency converter after adjusting a first element in the frequency converter; a second processing module, configured to add a second element to the circuit where the first element is located in the physical model of the frequency converter based on the circuit parameters of the physical model of the frequency converter, so as to update the physical model of the frequency converter; and a determining module, configured to determine that the frequency converter structure optimization is successful if the simulated current of the updated physical model of the frequency converter is less than or equal to a preset current value.
[0013] According to a third aspect of the embodiments of this application, an electronic device is also provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the inverter structure optimization method described in the first aspect above.
[0014] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is also provided, storing a computer program that, when executed by a processor, implements the inverter structure optimization method of the first aspect described above.
[0015] The inverter structure optimization method proposed in this application involves adjusting a first component in the inverter and then constructing a physical model of the inverter based on the circuit components. According to the circuit parameters of the physical model, a second component is added to the circuit containing the first component to update the physical model. This addition compensates for performance changes after the adjustment of the first component. If the simulated current of the updated physical model is less than or equal to a preset current value, the inverter structure optimization is considered successful. The relationship between the simulated current and the preset current value is used to determine whether the inverter's performance after the first component adjustment is consistent with its performance before adjustment. This embodiment achieves this by adjusting components without affecting the inverter's performance, thus solving the problem of high inverter costs. Attached Figure Description
[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.
[0017] Figure 1 This is a flowchart illustrating a method for optimizing the structure of a frequency converter according to an embodiment of this application;
[0018] Figure 2 This is a schematic diagram of a reactor impulse test and simulation circuit provided in one embodiment of this application;
[0019] Figure 3 This is a three-dimensional schematic diagram of a frequency converter structure before and after optimization, provided in one embodiment of this application.
[0020] Figure 4 This is a schematic diagram of the equivalent circuit of the impedance model before and after the structure optimization of a frequency converter according to one embodiment of this application;
[0021] Figure 5 This is a flowchart illustrating a frequency converter structure optimization method provided in another embodiment of this application;
[0022] Figure 6 This is a schematic diagram of a frequency converter structure optimization device provided in another embodiment of this application;
[0023] Figure 7 This is a schematic diagram of the structure of an electronic device provided in another embodiment of this application. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.
[0025] To facilitate understanding of the embodiments of this application, we will first introduce the relevant content about frequency converters for steel mill rolling mills in industrial applications.
[0026] In the frequency converters of rolling mills, low-inductance busbars (using a composite structure of conductive and insulating materials) can effectively reduce stray inductance in AC circuits compared to ordinary busbars, and reduce the risk of capacitor failure due to overheating caused by repeated charging and discharging. Therefore, low-inductance busbars are commonly used in the power cabinets, electrical control cabinets, and inter-cabinet connections of frequency converters. However, low-inductance busbars are expensive, and large-scale use will lead to a sharp increase in costs.
[0027] To address the aforementioned technical problem of high inverter cost, this application proposes an inverter structure optimization method. The implementation details of the inverter structure optimization method in this embodiment are described below. The following content is only for ease of understanding and is not necessary for implementing this solution.
[0028] Example 1:
[0029] The inverter structure optimization method of this embodiment can be applied to electronic devices with communication, computing, and data storage capabilities. Its specific process can be as follows: Figure 1 As shown, it includes:
[0030] S101, After adjusting the first component in the frequency converter, construct a physical model of the frequency converter based on the circuit components in the frequency converter;
[0031] In this embodiment, adjustments to the first component in the frequency converter include, but are not limited to, adjusting the model, brand, parameters, and type of the first component. Electronic components can also be added or removed. For example, the capacitor can be adjusted from 3300μF to 5000μF, or the low-inductance busbar can be changed to a normal busbar; or an inductor can be added to the frequency converter.
[0032] In practical applications, the purpose of adjusting the first component is usually to reduce its cost. In this embodiment, after adjusting the first component, and while adding a second component to the circuit containing the first component, cost reduction is achieved while maintaining the performance of the frequency converter unaffected.
[0033] After adjusting the first component in the frequency converter, a physical model of the frequency converter is constructed based on the circuit components. This facilitates subsequent structural optimization and simulation of the frequency converter. The physical model of the frequency converter can be a two-dimensional model or a three-dimensional model, which can be selected based on practical experience. For example, when adjusting the first component based on its voltage and resistance, the physical model of the frequency converter can be a two-dimensional model; however, when adjusting the first component based on its inductance parameters, which involves electromagnetic field analysis, the physical model of the frequency converter usually needs to be constructed as a three-dimensional model.
[0034] In practical applications, physical models of the frequency converter can be constructed based on the circuit components before and after the adjustment of the first component. The only difference between the two is whether the first component has been adjusted. In the subsequent optimization of the frequency converter structure, the physical model of the frequency converter before the adjustment of the first component is used as a control group for the physical model of the frequency converter after the adjustment of the first component. It should be noted that the following physical models of the frequency converter are all physical models of the frequency converter after the adjustment of the first component.
[0035] S102, Based on the circuit parameters of the inverter physical model, add a second element to the circuit where the first element is located in the inverter physical model to update the inverter physical model.
[0036] In this embodiment, the first element and the second element include, but are not limited to, capacitors, inductors, resistors, filters, busbars, and other components.
[0037] In this embodiment, the adjusted circuit parameters of the frequency converter include, but are not limited to, the frequency converter's impedance, resistance, current, voltage, and power. Based on the adjusted circuit parameters, a second component is added to the physical model of the frequency converter to ensure that the adjusted frequency converter achieves the same performance as the frequency converter without adjusting the first component. For example, when adjusting the low-inductance busbar in the frequency converter to a normal busbar, a capacitor or inductor is added to the circuit containing the low-inductance busbar to ensure that the adjusted circuit impedance matches the circuit impedance of the frequency converter without adjusting the first component.
[0038] S103. If the simulated current of the updated inverter physical model is less than or equal to the preset current value, then the inverter structure optimization is confirmed to be successful.
[0039] In the physical model of the frequency converter, a second element is added to the circuit containing the first element. After updating the physical model, a simulation test is performed on the frequency converter to simulate whether the simulated current of the updated physical model is less than or equal to a preset current value under actual operating conditions. The preset current value can be the current value output by the frequency converter under actual operating conditions when the first element is not adjusted, or it can be set based on practical experience. This embodiment does not limit this.
[0040] If the simulated current of the updated inverter physical model is less than or equal to the preset current value, it means that the adjustment of the first component in the inverter is feasible; otherwise, it means that the current adjustment of the first component is not feasible.
[0041] The inverter structure optimization method proposed in this application involves adjusting a first component in the inverter and then constructing a physical model of the inverter based on the circuit components. According to the circuit parameters of the physical model, a second component is added to the circuit containing the first component to update the physical model. This addition compensates for performance changes after the adjustment of the first component. If the simulated current of the updated physical model is less than or equal to a preset current value, the inverter structure optimization is considered successful. The relationship between the simulated current and the preset current value is used to determine whether the inverter's performance after the first component adjustment is consistent with its performance before adjustment. This embodiment achieves this by adjusting components without affecting the inverter's performance, thus solving the problem of high inverter costs.
[0042] In some embodiments, step S101 includes, but is not limited to: constructing an equivalent circuit of the inverter based on the circuit elements in the inverter; applying a sweep current of a preset frequency to the physical model of the inverter to extract the stray inductance parameters of the main circuit of the inverter; and constructing an impedance matrix based on the stray inductance parameters.
[0043] In practical application scenarios, a physical model of the frequency converter after the first component adjustment is constructed. The preset frequency of the sweep current is determined according to the actual operating conditions. By applying the preset frequency sweep current to the physical model of the frequency converter, the stray inductance parameters of devices such as IGBT (integrated gate commutated thyristor) modules and busbars in the main circuit of the frequency converter are extracted using Q3D (Ansys Q3DExtractor, a parasitic parameter extraction tool for modern electronic design). The impedance matrix and equivalent circuit corresponding to the physical model of the frequency converter are obtained.
[0044] In some embodiments, step S102 includes, but is not limited to: constructing the inverter impedance model in the updated inverter physical model based on the stray inductance parameters and the component parameters of the second element.
[0045] In this embodiment, by combining the stray inductance parameters of devices such as the IGCT phase module and busbar extracted by Q3D, the second element of the circuit where the first element is located is supplemented according to the main circuit of the inverter. Then, the inverter impedance model and equivalent circuit are created based on the IGCT phase module, busbar, first element and second element in the inverter physical model.
[0046] In one example, the first component of the inverter is a low-inductance busbar, and the second component is a supporting capacitor and an inductor. The low-inductance busbar in the inverter is adjusted to a normal busbar. Supporting capacitors and inductors are added to the circuit where the low-inductance busbar is located. Combined with the stray inductance obtained by extracting the IGCT phase module and busbar in the inverter, the supporting capacitors, inductors and other devices in the circuit where the low-inductance busbar is located are added according to the main circuit of the inverter to create the inverter impedance model and equivalent circuit.
[0047] In some embodiments, after performing step S102, the process includes, but is not limited to: performing an electrical impulse test on the updated inverter physical model according to a preset test plan to obtain the impedance model simulation current corresponding to the inverter impedance model; performing an electrical impulse test on the inverter according to the preset test plan to obtain the actual current of the reactor; and determining that the impedance circuit in the updated inverter physical model is correct if the difference between the impedance model simulation current and the actual current of the reactor is less than a preset current difference threshold.
[0048] The preset test scheme in this embodiment can simulate the voltage surge intensity experienced by the reactor during a short-circuit fault by setting different resistance values and short-circuit times. In the actual inverter circuit, the actual current waveform of the reactor is acquired in real time through a current sensor connected in series with the reactor. During the simulation test, based on the constructed equivalent circuit of the inverter impedance model (including stray inductance parameters), voltage surge simulation is performed on the reactor in the phase module, and the simulated current waveform of the equivalent circuit of the inverter impedance model is acquired.
[0049] In one example, such as Figure 2 As shown, four test schemes are set for the IGCT phase module. For example, the test voltage of test 1 is 100V, test 2 is 150V, test 3 is 200V, and test 4 is 2585V. By setting different voltages, the voltage impact of the frequency converter on the reactor L2 during a short circuit fault is simulated. The current waveform is collected in real time to simulate the voltage impact that the reactor L2 bears when the rolling mill frequency converter is short-circuited in actual working conditions, and to monitor the consistency difference between the actual current of the reactor and the simulated current of the impedance model.
[0050] In this embodiment, the difference between the simulated current in the impedance model and the actual current in the reactor is analyzed to determine whether there is a discrepancy between the two. If the difference between the simulated current in the impedance model and the actual current in the reactor is less than a preset current difference threshold, the impedance circuit in the updated inverter physical model is correct; otherwise, the impedance circuit in the inverter physical model is considered to have an error and needs to be adjusted.
[0051] In some embodiments, step S103 includes, but is not limited to: monitoring the current of the supporting capacitor in the updated inverter physical model; if the simulated current of the supporting capacitor is less than or equal to a preset current value, then the inverter structure optimization is determined to be successful.
[0052] In practical applications, the current of the supporting capacitors in the updated inverter physical model is monitored, and the difference between the simulated capacitor current and the preset current value is compared. If the simulated current is lower than the preset current value, it proves that the structural optimization scheme is feasible. If the simulated current is higher than the preset current value, the single-drive inverter structure optimization continues. In this embodiment, the effective values of all supporting capacitor currents are lower than the preset current values. After the first component is adjusted, the inverter runs normally, thus realizing that the inverter structure optimization scheme is reasonable and effective.
[0053] The preset current value can be calculated by statistically analyzing the simulated current of the support capacitor before and after the adjustment of the first element.
[0054] In one example, by constructing physical models of the frequency converter before and after the adjustment of the first component, statistical analysis is performed on the simulated current of the supporting capacitor in the physical models of the frequency converter before and after the adjustment of the first component. The difference between the simulated capacitor current of the two equivalent circuits corresponding to the two models is compared to determine whether the frequency converter operates normally after the adjustment of the first component.
[0055] In some embodiments, if the simulated current is greater than a preset current value, the first component is adjusted. In practical applications, the adjustment method of the first component can be determined based on the difference between the simulated current and the preset current value. For example, the first component can be readjusted based on the difference between the simulated current and the preset current value, such as adjusting the number of the first component or adjusting the component parameters or specifications. In one example, the number of low-inductance busbars can be increased based on the difference between the simulated current and the preset current value.
[0056] Alternatively, if the simulated current is greater than the preset current value, the second component can be adjusted. In practical applications, the adjustment method for the second component can be determined based on the difference between the simulated current and the preset current value. For example, the number and specifications of the supporting capacitors and the number and specifications of the inductors added to the circuit containing the first component can be determined based on the difference between the simulated current and the preset current value.
[0057] In some embodiments, the first element includes a low-inductance busbar, and the second element includes a capacitor and / or an inductor. The adjustment of the first element in the inverter includes, but is not limited to, adjusting the low-inductance busbar to a normal busbar, wherein the stray inductance of the low-inductance busbar is lower than a first stray inductance threshold, and the inductance of the normal busbar is greater than a second stray inductance threshold, and the second stray inductance threshold is greater than the first stray inductance threshold.
[0058] In one example, such as Figure 3 As shown, the inverter structure is optimized. Three low-inductance busbars are used on the back of each cabinet. The low-inductance busbar in the power cabinet is directly connected to the absorption capacitor of the IGCT module, the low-inductance busbar in the control cabinet is directly connected to the support capacitor, and the low-inductance busbar in the chopper cabinet is mainly used for the circuit connection between the two control cabinets. By moving the control cabinet and chopper cabinet from the middle of the two power cabinets to the right side of the power cabinets, while keeping the positions of the remaining power cabinets, control cabinets, and water-cooled cabinets unchanged, the chopper cabinet in the single-drive inverter can reduce the need for three inter-cabinet low-inductance busbars.
[0059] Based on the circuit parameters of the frequency converter, a second component is added to the circuit where the first component is located in the physical model of the frequency converter to update the physical model of the frequency converter, including but not limited to: adding a capacitor and / or an inductor to the circuit where the first component is located based on the circuit parameters.
[0060] In one example, such as Figure 4 As shown, by combining the extracted IGCT phase module and busbar, and supplementing the supporting capacitors, inductors, and other components of the circuit where the busbar is located according to the main circuit of the inverter, an equivalent circuit of the inverter impedance model is created.
[0061] For example Figure 3-4 Taking the inverter structure optimization scheme shown as an example, this embodiment will be described in detail with reference to actual application scenarios. Figure 5 As shown, the method may specifically include the following steps:
[0062] S501, Inverter structure adjustment;
[0063] The above has already addressed such matters. Figure 3-4 The structural optimization scheme for the frequency converter shown has been described in detail and will not be repeated here. By adjusting the position between frequency converter cabinets, the number of low-inductance busbars is reduced, thereby achieving the goal of cost reduction.
[0064] S502, Construct a physical model of the frequency converter;
[0065] Specifically, physical models of the frequency converter before and after cost reduction are constructed, the sweep current frequency is determined according to the actual operating conditions, and the stray inductance of devices such as the IGCT module and busbar in the main circuit of the frequency converter is extracted using Q3D to obtain the corresponding impedance matrix and equivalent circuit.
[0066] S503, create the inverter impedance model;
[0067] Specifically, by combining the extracted IGCT phase modules and busbars, and supplementing the supporting capacitors, inductors, and other components of the circuit where the busbars are located according to the main circuit of the inverter, an inverter impedance model and equivalent circuit are created.
[0068] S504, capacitor current simulation of equivalent circuit of inverter impedance model;
[0069] The correctness of the impedance circuit was verified by conducting reactor impulse tests. Reactor impulse simulation and experimental analysis were performed using rectifier cabinet phase modules. Figure 2 As shown, the reactor impulse test scheme consists of four sets of tests to simulate the voltage impulse that reactor L2 experiences when the rolling mill frequency converter experiences a short circuit in actual working conditions, and to monitor the consistency difference between the actual reactor current and the simulated current of the impedance model.
[0070] S505 determines whether the simulated current of the supporting capacitor is qualified.
[0071] Furthermore, the equivalent circuits before and after the frequency converter structure optimization were run. Each phase module was selected with a supporting capacitor, and a total of 6 supporting capacitors were selected for current monitoring for the 6 phase modules of the power cabinet.
[0072] Finally, statistical analysis was performed on the simulated current of the supporting capacitor before and after structural optimization, the effective value was calculated, and the difference between the simulated capacitor current of the two equivalent circuits was compared. If the simulated current is lower than the effective value of the maximum allowable current, it proves that the structural optimization scheme is feasible. If the simulated current is higher than the effective value of the maximum allowable current, the single-drive frequency converter structural optimization is continued. In this embodiment, the effective values of all capacitor currents are lower than the effective value of the maximum allowable current. The frequency converter runs normally after structural optimization, proving that the method of reducing the use of low-inductance busbars by adjusting the position of the electrical control cabinet and chopper cabinet to achieve structural optimization is reasonable and effective.
[0073] Example 2:
[0074] Another embodiment of this application relates to a frequency converter structure optimization device. The implementation details of this embodiment's frequency converter structure optimization device are described below. The following content is only for ease of understanding and is not essential for implementing this solution. A schematic diagram of this embodiment's frequency converter structure optimization device can be seen as follows: Figure 6 As shown, it includes a first module 601, a second module 602, and a determining module 603.
[0075] The first processing module 601 is used to construct a physical model of the frequency converter based on the circuit elements in the frequency converter after adjusting the first component in the frequency converter.
[0076] The second processing module 602 is used to add a second element to the circuit where the first element is located in the physical model of the inverter according to the circuit parameters of the physical model of the inverter, so as to update the physical model of the inverter.
[0077] The determination module 603 is used to determine that the inverter structure optimization is successful if the simulated current of the updated inverter physical model is less than or equal to the preset current value.
[0078] It is worth mentioning that all modules involved in this embodiment are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed in this application; however, this does not mean that other units are absent in this embodiment.
[0079] Example 3:
[0080] Another embodiment of this application relates to an electronic device, such as... Figure 7 As shown, it includes: at least one processor 701; and a memory 702 communicatively connected to the at least one processor 701; wherein the memory 702 stores instructions executable by the at least one processor 701, the instructions being executed by the at least one processor 701 to enable the at least one processor 701 to execute the inverter structure optimization method in the above embodiments.
[0081] The memory and processor are connected via a bus, which can include any number of interconnecting buses and bridges, connecting various circuits of one or more processors and memories. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor is transmitted over the wireless medium via an antenna, which further receives data and transmits it to the processor.
[0082] The processor manages the bus and general processing, and also provides various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory is used to store data used by the processor during operation.
[0083] Example 4:
[0084] Another embodiment of this application relates to a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the method embodiments described above.
[0085] That is, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0086] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.
Claims
1. A method for optimizing the structure of a frequency converter, characterized in that, include: After adjusting the first component in the frequency converter, a physical model of the frequency converter is constructed based on the circuit components in the frequency converter. Based on the circuit parameters of the inverter physical model, a second element is added to the circuit where the first element is located in the inverter physical model to update the inverter physical model. If the simulated current of the updated inverter physical model is less than or equal to the preset current value, then the inverter structure optimization is determined to be successful.
2. The method according to claim 1, characterized in that, After adjusting the first component in the frequency converter, constructing a physical model of the frequency converter based on the circuit components in the frequency converter includes: Construct the equivalent circuit of the frequency converter based on the circuit elements in the frequency converter; A sweep current of a preset frequency is applied to the physical model of the frequency converter to extract the stray inductance parameters of the main circuit of the frequency converter. Construct an impedance matrix based on the stray inductance parameters.
3. The method according to claim 2, characterized in that, The step of adding a second element to the circuit containing the first element in the physical inverter model based on the circuit parameters of the physical inverter model to update the physical inverter model includes: Based on the stray inductance parameters and the component parameters of the second element, the inverter impedance model in the updated inverter physical model is constructed.
4. The method according to claim 3, characterized in that, After adding a second element to the circuit containing the first element in the physical model of the frequency converter based on the inductance parameters of the frequency converter, the method further includes: According to the preset test plan, the updated inverter physical model is subjected to an electrical impulse test to obtain the impedance model simulation current corresponding to the inverter impedance model. The inverter is subjected to an electrical impact test according to the preset test plan to obtain the actual current of the reactor. If the difference between the simulated current of the impedance model and the actual current of the reactor is less than a preset current difference threshold, it is determined that the impedance circuit in the updated inverter physical model is correct.
5. The method according to claim 1, characterized in that, If the simulated current of the updated inverter physical model is less than or equal to the preset current value, then the inverter structure optimization is determined to be successful, including: Current monitoring is performed on the supporting capacitors in the updated physical model of the frequency converter; If the simulated current of the supporting capacitor is less than or equal to the preset current value, then the first element is determined to have been successfully optimized.
6. The method according to claim 5, characterized in that, Also includes: If the simulated current is greater than the preset current value, then the first component is adjusted; or, If the simulated current is greater than the preset current value, the second component is adjusted.
7. The method according to claim 1, characterized in that, The first element includes a low-inductance busbar, and the second element includes a capacitor and / or an inductor, wherein, Adjusting the first component in the frequency converter includes: The low-inductance busbar is adjusted to a normal busbar, wherein the stray inductance of the low-inductance busbar is lower than the first stray inductance threshold, and the inductance of the normal busbar is greater than the second stray inductance threshold, and the second stray inductance threshold is greater than the first stray inductance threshold. The step of adding a second element to the circuit containing the first element in the physical model of the frequency converter, based on the circuit parameters of the frequency converter, to update the physical model of the frequency converter includes: Based on the circuit parameters, a capacitor and / or an inductor are added to the circuit containing the first element.
8. A frequency converter structure optimization device, characterized in that, include: The first processing module is used to construct a physical model of the frequency converter based on the circuit elements in the frequency converter after adjusting the first component in the frequency converter. The second processing module is used to add a second element to the circuit where the first element is located in the physical model of the inverter according to the circuit parameters of the physical model of the inverter, so as to update the physical model of the inverter. The determination module is used to determine that the inverter structure optimization is successful if the simulated current of the updated inverter physical model is less than or equal to a preset current value.
9. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the inverter structure optimization method as described in any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the inverter structure optimization method according to any one of claims 1 to 7.