CN113420434B - Modeling method and device of motor inverter - Google Patents
Modeling method and device of motor inverter Download PDFInfo
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- CN113420434B CN113420434B CN202110678083.XA CN202110678083A CN113420434B CN 113420434 B CN113420434 B CN 113420434B CN 202110678083 A CN202110678083 A CN 202110678083A CN 113420434 B CN113420434 B CN 113420434B
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Abstract
The invention discloses a modeling method and device of a motor inverter. The method comprises the steps of obtaining structural parameters of all components in the motor inverter; the components of the motor inverter comprise a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell; according to the structural parameters of each component in the motor inverter, circuit models of each component in the motor inverter are constructed in a one-to-one correspondence mode; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model; the circuit model of the motor inverter is determined according to the shielding cable circuit model, the direct-current bus capacitor circuit model, the power module characteristic circuit model, the motor module circuit model and the inverter shell circuit model, so that the motor inverter model is accurately constructed, and the accurate prediction and analysis of the electromagnetic interference of the motor inverter are achieved.
Description
Technical Field
The embodiment of the invention relates to a motor technology, in particular to a modeling method and device of a motor inverter.
Background
The motor inverter system is used as a vehicle-mounted high-power component and is continuously developed in the direction of light, small and high efficiency, the switching speed of a power module is higher and higher, the generated electromagnetic interference energy is large, the frequency band is wide, the motor inverter system is a main interference source in a new energy vehicle, and the prediction of the electromagnetic interference through electromagnetic compatibility is of great significance to the development of the new energy vehicle.
At present, the electromagnetic compatibility technology for a motor inverter system is not perfect, the accuracy of electromagnetic compatibility is low, and the reference significance to actual design is limited.
Disclosure of Invention
The invention provides a modeling method and a modeling device for a motor inverter, which are used for realizing the accurate construction of a motor inverter model and achieving the accurate prediction and analysis of electromagnetic interference of the motor inverter.
In a first aspect, an embodiment of the present invention provides a modeling method for a motor inverter, where the method includes:
obtaining structural parameters of each component in the motor inverter; the components of the motor inverter comprise a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell;
according to the structural parameters of all components in the motor inverter, circuit models of all components in the motor inverter are constructed in a one-to-one correspondence mode; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model;
and determining a circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model.
Optionally, constructing circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter includes:
acquiring actual impedance parameters of each component in the motor inverter based on an impedance analyzer;
establishing primary circuit models of all components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of all components in the motor inverter;
respectively simulating primary circuit models of all components in the motor inverter, and determining simulated impedance parameters of the primary circuit models of all the components in the motor inverter in a one-to-one correspondence manner;
determining parameter deviations of actual impedance parameters and simulated impedance parameters of all components in the motor inverter in a one-to-one correspondence manner;
judging whether the parameter deviation is smaller than a preset deviation or not;
if not, adjusting the structural parameters of each component in the motor inverter in a one-to-one correspondence manner according to the parameter deviation of each component in the motor inverter;
and taking the adjusted structural parameters as structural parameters for establishing primary circuit models of all components in the motor inverter, and returning to execute the step of establishing the primary circuit models of all the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of all the components in the motor inverter.
Optionally, the method further includes:
and if the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter is smaller than the preset deviation, taking the current primary circuit model of each component in the motor inverter as the circuit model of each component in the motor inverter.
Optionally, determining the circuit model of the motor inverter according to the shielded cable circuit model, the dc bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter casing circuit model includes:
acquiring actual electromagnetic compatibility measurement parameters of the motor inverter based on an electromagnetic compatibility tester;
determining a primary circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model;
carrying out simulation calculation on a primary circuit model of the motor inverter to determine electromagnetic compatibility simulation parameters of the motor inverter;
judging whether the electromagnetic compatibility simulation parameters are higher than the electromagnetic compatibility parameters;
if so, adjusting the structural parameters of each component in the motor inverter;
and taking the adjusted structural parameters as structural parameters for establishing a primary circuit model of each component in the motor inverter, and returning to execute the step of establishing the circuit models of each component in the motor inverter in a one-to-one correspondence manner according to the structural parameters of each component in the motor inverter.
Optionally, the method further includes:
and if the electromagnetic compatibility simulation parameter is less than or equal to the electromagnetic compatibility parameter, taking the current primary circuit model of the motor inverter as the circuit model of the motor inverter.
Optionally, before performing simulation calculation on the primary circuit model of the motor inverter and determining the electromagnetic compatibility simulation parameter of the motor inverter, the method includes:
and normalizing the power module characterization circuit model in the primary circuit model of the motor inverter.
In a second aspect, an embodiment of the present invention further provides a modeling apparatus for a motor inverter, where the apparatus includes:
the structure parameter acquisition module is used for acquiring the structure parameters of each component in the motor inverter; the motor inverter comprises a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell;
the component model building module is used for building circuit models of all components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of all components in the motor inverter; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model;
and the motor inverter model determining module is used for determining a circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model.
Optionally, the component model building module includes:
the actual impedance parameter acquisition unit is used for acquiring actual impedance parameters of all components in the motor inverter based on the impedance analyzer;
the primary component model establishing unit is used for establishing primary circuit models of all components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of all the components in the motor inverter;
the simulation impedance parameter determining unit is used for respectively simulating the primary circuit models of the components in the motor inverter and determining the simulation impedance parameters of the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner;
the parameter deviation determining unit is used for determining the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter in a one-to-one correspondence manner;
a deviation judging unit, configured to judge whether the parameter deviation is smaller than a preset deviation;
the first adjusting unit is used for adjusting the structural parameters of each component in the motor inverter in a one-to-one correspondence manner according to the parameter deviation of each component in the motor inverter when the parameter deviation is larger than a preset deviation;
and the first returning unit is used for taking the adjusted structural parameters as the structural parameters for establishing the primary circuit models of the components in the motor inverter and returning to the step of establishing the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter.
Optionally, the component model building module further includes:
and the component model building unit is further used for taking the current primary circuit model of each component in the motor inverter as the circuit model of each component in the motor inverter when the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter is smaller than the preset deviation.
Optionally, the motor inverter model determining module includes:
the measurement parameter acquisition unit is used for acquiring actual electromagnetic compatibility measurement parameters of the motor inverter based on an electromagnetic compatibility tester;
a primary motor inverter model determining unit, configured to determine a primary circuit model of the motor inverter according to the shielded cable circuit model, the dc bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter casing circuit model;
the simulation parameter determining unit is used for performing simulation calculation on a primary circuit model of the motor inverter and determining an electromagnetic compatibility simulation parameter of the motor inverter;
the parameter judging unit is used for judging whether the electromagnetic compatibility simulation parameter is higher than the electromagnetic compatibility parameter;
the second adjusting unit is used for adjusting the structural parameters of each component in the motor inverter when the electromagnetic compatibility simulation parameters are higher than the electromagnetic compatibility parameters;
and the second returning unit is used for taking the adjusted structural parameters as the structural parameters for establishing the primary circuit models of the components in the motor inverter and returning to execute the step of establishing the circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter.
According to the embodiment of the invention, the circuit model of each component in the motor inverter is constructed in a one-to-one correspondence manner according to the acquired structural parameters of each component in the motor inverter, and the circuit model of the motor inverter is determined by the shielding cable circuit model, the direct current bus capacitor circuit model, the power module characterized circuit model, the motor module circuit model and the inverter shell circuit model, so that the accurate construction of the motor inverter model is realized, the accurate prediction and analysis of the electromagnetic interference of the motor inverter can be realized, and the problem of lower accuracy of the electromagnetic interference simulation in the prior art is solved.
Drawings
Fig. 1 is a flowchart of a modeling method of a motor inverter according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a shielded cable circuit model provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a dc capacitor circuit model according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a power module characterization model according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a circuit model of a motor module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an inverter housing circuit model provided by an embodiment of the invention;
fig. 7 is a schematic structural diagram of a circuit model of a motor inverter according to an embodiment of the present invention;
FIG. 8 is a flow chart of another method of modeling a motor inverter provided in accordance with an embodiment of the present invention;
fig. 9 is a flowchart of a modeling method of a motor inverter according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a modeling apparatus of a motor inverter according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another modeling apparatus for a motor inverter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a modeling method for a motor inverter according to an embodiment of the present invention, where the present embodiment is applicable to a modeling situation of a motor inverter, and the method may be executed by a modeling apparatus for a motor inverter, and specifically includes the following steps:
s110, obtaining structural parameters of each component in the motor inverter;
each component of the motor inverter comprises a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell.
Specifically, the structural parameters of the shielding cable circuit include the structural size of the shielding cable circuit, the material properties and the lengths of different layers of the shielding cable, and the like; the structural parameters of the direct current bus capacitor circuit comprise the size of the internal structures (such as positive and negative busbars, thin films and media), the relative position among the internal structures, the capacitance value of the direct current bus capacitor circuit and the like; the structural parameters of the power switch circuit comprise voltage resistance, current, switch turn-off time, loss value and the like; the structural parameters of the motor load comprise the actual impedance value and the like; the structural parameters of the inverter shell comprise the relative position between the inverter shell and the positive and negative busbars, the material properties of the inverter shell and the positive and negative busbars and other structural parameters.
S120, constructing circuit models of the components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of the components in the motor inverter;
the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model; the method comprises the steps of constructing a shielding cable circuit model according to structural parameters of a shielding cable circuit, constructing a direct-current bus capacitor circuit model according to the structural parameters of the direct-current bus capacitor circuit, constructing a power module characterization circuit model according to the structural parameters of a power switch circuit, constructing a motor module circuit model according to the structural parameters of a motor load, and constructing an inverter shell circuit model according to the structural parameters of an inverter shell.
Exemplarily, fig. 2 is a schematic structural diagram of a shielded cable circuit model provided in an embodiment of the present invention, and as shown in fig. 2, parasitic parameters of a capacitor, an inductor, and a resistor of the shielded cable circuit may be extracted and the shielded cable circuit model may be established according to structural parameters such as a structural size of the actual shielded cable circuit, and material properties and lengths of different layers of the shielded cable; the shielding cable circuit model comprises at least one RLC loop; at least one RLC loops are sequentially and electrically connected in series; the RLC loop comprises a first resistor R1, a first inductor L1 and a first capacitor C1; a first end of the first resistor R1 is electrically connected with the positive electrode of the direct-current power supply circuit; a second end of the first resistor R1 is electrically connected with a first end of the first inductor L1; the second end of the first inductor L1 is electrically connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is electrically connected to the negative terminal of the dc power supply sub-circuit and grounded.
Fig. 3 is a schematic structural diagram of a dc capacitor circuit model according to an embodiment of the present invention, and as shown in fig. 3, the parasitic parameters of the capacitor, the inductor, and the resistor in the dc capacitor circuit may be extracted and the dc capacitor circuit model may be established according to the size of the internal structure (including positive and negative busbars, thin films, and media) of the actual dc capacitor circuit, the relative position between the internal structures, and the capacitance of the dc bus capacitor circuit; the direct current capacitor circuit model comprises a differential mode equivalent circuit 01, a first common mode equivalent circuit 02 and a second common mode equivalent circuit 03; the differential mode equivalent circuit 01 comprises a second resistor R2, a second inductor L2 and a third capacitor C3 which are sequentially connected in series; the first common-mode equivalent circuit 02 comprises a third resistor R3, a third inductor L3 and a third capacitor C3 which are sequentially connected in series; the second common mode equivalent circuit 03 includes a fourth resistor R4, a fourth inductor L4, and a fourth capacitor C4 connected in series in this order.
Fig. 4 is a schematic structural diagram of a power module characterization model provided in an embodiment of the present invention, and as shown in fig. 4, the parasitic parameters of the inductance, the capacitance, and the resistance of each power switch may be extracted and the power module characterization model may be established according to the actual structural parameters of the power switch circuit, such as the withstand voltage, the current, the switch turn-off time, and the loss value. The power module characterization model includes at least one group 04 of insulated gate bipolar transistors connected in parallel; the insulated gate bipolar transistor group includes at least one insulated gate bipolar transistor Q connected in series.
Fig. 5 is a schematic structural diagram of a circuit model of a motor module provided in an embodiment of the present invention, and as shown in fig. 5, parasitic parameters of an inductor, a capacitor, and a resistor may be extracted and a circuit model of the motor module may be established according to structural parameters such as an actual impedance value of an actual motor load. The motor module circuit model comprises at least one three-phase RLC motor equivalent load and a three-phase contact capacitor; equivalent loads of the three-phase RLC motor are sequentially connected in series; the three-phase RLC motor equivalent load comprises an equivalent capacitor, a U-phase equivalent RLC load, a V-phase equivalent RLC load and a W-phase equivalent RLC load; the equivalent U RLC load comprises a fifth inductor L5, a fifth resistor R5 and a fifth capacitor C5 which are connected in parallel; the equivalent-V RLC load comprises a sixth inductor L6, a sixth resistor R6 and a sixth capacitor C6 which are connected in parallel; the W-phase equivalent RL load comprises a seventh inductor L7, a seventh resistor R7 and a seventh capacitor C7 which are connected in parallel; the three-phase contact capacitor comprises a U-phase V-phase capacitor C11, a U-phase W-phase capacitor C12 and a V-phase W-phase capacitor C13.
Fig. 6 is a schematic structural diagram of a circuit model of an inverter housing according to an embodiment of the present invention, and as shown in fig. 6, parasitic parameters of a capacitor and an inductor of the inverter housing may be extracted according to structural parameters such as a relative position between the inverter housing and a positive/negative bus bar, and material properties of the inverter housing and the positive/negative bus bar. The inverter circuit model comprises a first circuit 05, a second circuit 06 and a third circuit 07, wherein the first circuit 05 comprises a first inductance equivalent circuit and a first capacitance equivalent circuit; the second circuit 06 includes a second inductance equivalent circuit and a second capacitance equivalent circuit; the third circuit 07 includes a third inductance equivalent circuit and a fourth capacitance equivalent circuit.
And S130, determining a circuit model of the motor inverter according to the shielded cable circuit model, the direct current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model.
For example, fig. 7 is a schematic structural diagram of a circuit model of a motor inverter according to an embodiment of the present invention, and as shown in fig. 7, according to the arrangement and connection relationship of actual components in a motor inverter system, a shielded cable circuit model 10, a dc bus capacitor circuit model 20, a power module characterization circuit model 30, a motor module circuit model 40, and an inverter casing circuit model 50 are connected to obtain the circuit model of the motor inverter.
Optionally, on the basis of the foregoing embodiment, a circuit model of each component of the motor inverter is further optimized, and fig. 8 is a flowchart of another modeling method for the motor inverter according to the embodiment of the present invention, as shown in fig. 8, the modeling method includes:
s210, obtaining structural parameters of each component in the motor inverter;
s220, acquiring actual impedance parameters of all components in the motor inverter by an impedance analyzer;
the actual impedance parameters of the shielding cable circuit, the direct current bus capacitor circuit, the power module switch circuit, the motor module circuit and the inverter shell circuit can be obtained through the impedance analyzer.
S230, building primary circuit models of the components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of the components in the motor inverter;
s240, respectively simulating the primary circuit models of the components in the motor inverter, and determining the simulated impedance parameters of the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner;
s250, determining parameter deviation of actual impedance parameters and simulated impedance parameters of all components in the motor inverter in a one-to-one correspondence manner;
s260, judging whether the parameter deviation is smaller than a preset deviation or not; if not, executing S270; if yes, go to step S280.
S270, adjusting the structural parameters of each component in the motor inverter one by one according to the parameter deviation of each component in the motor inverter; and taking the adjusted structural parameters as structural parameters for establishing a primary circuit model of each component in the motor inverter, and returning to execute S230.
And S280, taking the primary circuit model of each component in the current motor inverter as the circuit model of each component in the motor inverter.
Comparing the simulated impedance parameters of each component model with the actual impedance parameters, if the deviation between the simulated impedance parameters and the actual impedance parameters is large, adjusting the structural parameters of each component in the motor inverter so as to establish a primary circuit model of each component according to the adjusted structural parameters of each component, and comparing the simulated impedance parameters with the actual impedance parameters again until the deviation between the simulated parameters and the actual impedance parameters is small, and determining the primary circuit model of each component as the circuit model of each component; if the deviation between the simulated impedance parameter and the actual impedance parameter is directly judged to be smaller, determining the primary circuit model of each component as the circuit model of each component; and establishing a high-precision circuit model of each component through iterative optimization of each structural parameter.
And S290, determining a circuit model of the motor inverter according to the shielded cable circuit model, the direct current bus capacitor circuit model, the power module characteristic circuit model, the motor module circuit model and the inverter shell circuit model.
According to the arrangement and connection relation of actual components in the motor inverter system, the circuit model of each high-precision component is constructed to obtain the circuit model of the motor inverter, the accuracy of the obtained circuit model of the motor inverter is high, and accurate prediction and analysis of electromagnetic interference of the motor inverter are achieved.
Optionally, on the basis of the foregoing embodiment, a circuit model of the motor inverter is further optimized, and fig. 9 is a flowchart of a modeling method of a motor inverter according to another embodiment of the present invention, as shown in fig. 9, the simulation method includes:
s310, obtaining structural parameters of each component in the motor inverter;
s320, constructing circuit models of the components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of the components in the motor inverter;
s330, acquiring actual electromagnetic compatibility measurement parameters of the motor inverter based on the electromagnetic compatibility tester;
the electromagnetic compatibility measurement parameter refers to a parameter that electromagnetic conducted interference and electromagnetic radiation interference meet a certain standard. The conduction interference mainly means that interference signals generated by the motor inverter mutually interfere through a conductive medium or a common power line; the radiated interference means that the interference signal generated by the motor inverter transmits the interference signal to another electronic device through space coupling. In order to prevent electromagnetic interference generated by some motor inverters from influencing or damaging normal operation of other electronic equipment, the electromagnetic compatibility measurement parameters of the motor inverters need to meet a certain range, and therefore, the actual electromagnetic compatibility measurement parameters of the motor inverters are obtained firstly.
S340, determining a primary circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model;
s350, normalizing the power module characteristic circuit model in the primary circuit model of the motor inverter;
the electromagnetic conduction and radiation interference mainly comes from the power module, the power module characterization circuit model is replaced by a normalized frequency domain source, namely, the structural parameters of the power module are adjusted to normalize the output voltage of the power characterization circuit, so that the simulation efficiency of the circuit model of the subsequent motor inverter can be improved.
S360, carrying out simulation calculation on a primary circuit model of the motor inverter, and determining an electromagnetic compatibility simulation parameter of the motor inverter;
s370, judging whether the electromagnetic compatibility simulation parameters are higher than the electromagnetic compatibility measurement parameters; if yes, go to S380; if not, go to S390.
S380, adjusting the structural parameters of all components in the motor inverter; and taking the adjusted structural parameters as the structural parameters for establishing the primary circuit model of each component in the motor inverter, and returning to execute S320.
And S390, taking the primary circuit model of the current motor inverter as the circuit model of the motor inverter.
Comparing the electromagnetic compatibility measurement parameter of the motor inverter with the electromagnetic compatibility simulation parameter, if the electromagnetic compatibility measurement parameter is larger than the electromagnetic compatibility simulation parameter, adjusting the structural parameter of each component in the motor inverter, establishing a primary circuit model of each component according to the adjusted structural parameter of each component, and comparing the electromagnetic compatibility measurement parameter with the electromagnetic compatibility simulation parameter again until the electromagnetic compatibility simulation parameter is smaller than the electromagnetic compatibility measurement parameter, and taking the primary circuit model of the current motor inverter as the circuit model of the motor inverter; if the electromagnetic compatibility simulation parameter is directly judged to be smaller than the electromagnetic compatibility measurement parameter, the current primary circuit model of the motor inverter is used as the circuit model of the motor inverter, and thus, the high-precision circuit model of the motor inverter is established through iterative optimization of all structural parameters, so that guidance can be provided for the actual design of the motor inverter, and the accurate prediction and analysis of the electromagnetic interference of the motor inverter are achieved.
The embodiment of the invention also provides a modeling device of the motor inverter, and fig. 10 is a structural schematic diagram of the modeling device of the motor inverter provided by the embodiment of the invention; as shown in fig. 10, the modeling apparatus for a motor inverter according to the embodiment of the present invention may perform the modeling method for a motor inverter according to any embodiment of the present invention, and has functional modules and advantageous effects corresponding to the performed method. The device includes:
a structural parameter obtaining module 100, configured to obtain structural parameters of each component in the motor inverter; the motor inverter comprises a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell;
the component model building module 200 is used for building circuit models of components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model;
a motor inverter model determining module 300, configured to determine a circuit model of the motor inverter according to the shielded cable circuit model, the dc bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter housing circuit model.
Optionally, fig. 11 is a schematic structural diagram of another modeling apparatus for a motor inverter according to an embodiment of the present invention, and as shown in fig. 11, the component model building module 200 includes:
an actual impedance parameter obtaining unit 201, configured to obtain actual impedance parameters of each component in the motor inverter based on the impedance analyzer;
a primary component model establishing unit 202, configured to establish primary circuit models of components in the motor inverter in a one-to-one correspondence manner according to structural parameters of the components in the motor inverter;
the simulated impedance parameter determining unit 203 is configured to respectively simulate the primary circuit models of the components in the motor inverter, and determine simulated impedance parameters of the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner;
a parameter deviation determining unit 204, configured to determine parameter deviations of actual impedance parameters and simulated impedance parameters of each component in the motor inverter in a one-to-one correspondence manner;
a deviation determination unit 205, configured to determine whether the parameter deviation is smaller than a preset deviation;
a first adjusting unit 206, configured to adjust the structural parameters of each component in the motor inverter in a one-to-one correspondence manner according to the parameter deviation of each component in the motor inverter when the parameter deviation is greater than a preset deviation;
the first returning unit 207 is configured to use the adjusted structure parameters as structure parameters for building primary circuit models of the components in the motor inverter, and return to perform the step of building the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structure parameters of the components in the motor inverter.
Optionally, referring to fig. 11, the component model building module 200 further includes:
the component model building unit 208 is further configured to, when a parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter is smaller than a preset deviation, use the current primary circuit model of each component in the motor inverter as the circuit model of each component in the motor inverter.
Alternatively, referring to fig. 11, the motor inverter model determination module 300 includes:
a measurement parameter obtaining unit 301, configured to obtain an actual electromagnetic compatibility measurement parameter of the motor inverter based on the electromagnetic compatibility tester;
a primary motor inverter model determining unit 302, configured to determine a primary circuit model of the motor inverter according to the shielded cable circuit model, the dc bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter housing circuit model;
a simulation parameter determining unit 303, configured to perform simulation calculation on a primary circuit model of the motor inverter, and determine an electromagnetic compatibility simulation parameter of the motor inverter;
a parameter determining unit 304, configured to determine whether the emc simulation parameter is higher than the emc parameter;
a second adjusting unit 305, configured to adjust structural parameters of components in the motor inverter when the emc simulation parameter is higher than the emc parameter;
a second returning unit 306, configured to use the adjusted structure parameter as a structure parameter for building a primary circuit model of each component in the motor inverter, and return to the step of building circuit models of each component in the motor inverter in a one-to-one correspondence manner according to the structure parameter of each component in the motor inverter.
Optionally, referring to fig. 11, the motor inverter model determination module 300 further includes:
and a motor inverter model determining unit 307, configured to use the current primary circuit model of the motor inverter as the circuit model of the motor inverter when the electromagnetic compatibility simulation parameter is smaller than or equal to the electromagnetic compatibility parameter.
Optionally, referring to fig. 11, the apparatus further includes:
and the normalization processing module 400 is used for performing normalization processing on the power module characterization circuit model in the primary circuit model of the motor inverter.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A modeling method of a motor inverter, comprising:
obtaining structural parameters of each component in the motor inverter; the components of the motor inverter comprise a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell;
according to the structural parameters of all components in the motor inverter, circuit models of all components in the motor inverter are constructed in a one-to-one correspondence mode; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model;
determining a circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model;
wherein determining a circuit model of the motor inverter based on the shielded cable circuit model, the dc bus capacitive circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter housing circuit model comprises:
acquiring actual electromagnetic compatibility measurement parameters of the motor inverter based on an electromagnetic compatibility tester;
determining a primary circuit model of the motor inverter according to the shielded cable circuit model, the direct-current bus capacitor circuit model, the power module characterization circuit model, the motor module circuit model and the inverter shell circuit model;
carrying out simulation calculation on a primary circuit model of the motor inverter, and determining an electromagnetic compatibility simulation parameter of the motor inverter;
judging whether the electromagnetic compatibility simulation parameters are higher than the electromagnetic compatibility measurement parameters;
if so, adjusting the structural parameters of each component in the motor inverter;
and taking the adjusted structural parameters as structural parameters for establishing a primary circuit model of each component in the motor inverter, and returning to execute the step of establishing the circuit models of each component in the motor inverter in a one-to-one correspondence manner according to the structural parameters of each component in the motor inverter.
2. The modeling method of a motor inverter according to claim 1, wherein constructing a circuit model of each component in the motor inverter in a one-to-one correspondence according to a structural parameter of each component in the motor inverter comprises:
acquiring actual impedance parameters of each component in the motor inverter based on an impedance analyzer;
establishing primary circuit models of all components in the motor inverter in a one-to-one correspondence mode according to structural parameters of all components in the motor inverter;
respectively simulating primary circuit models of all components in the motor inverter, and determining simulated impedance parameters of the primary circuit models of all the components in the motor inverter in a one-to-one correspondence manner;
determining parameter deviations of actual impedance parameters and simulated impedance parameters of all components in the motor inverter in a one-to-one correspondence manner;
judging whether the parameter deviation is smaller than a preset deviation or not;
if not, adjusting the structural parameters of each component in the motor inverter in a one-to-one correspondence manner according to the parameter deviation of each component in the motor inverter;
and taking the adjusted structural parameters as structural parameters for establishing primary circuit models of all components in the motor inverter, and returning to execute the step of establishing the primary circuit models of all the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of all the components in the motor inverter.
3. The modeling method of a motor inverter of claim 2, further comprising:
and if the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter is smaller than the preset deviation, taking the current primary circuit model of each component in the motor inverter as the circuit model of each component in the motor inverter.
4. The modeling method of a motor inverter according to claim 1, further comprising:
and if the electromagnetic compatibility simulation parameter is less than or equal to the electromagnetic compatibility measurement parameter, taking the current primary circuit model of the motor inverter as the circuit model of the motor inverter.
5. The modeling method of a motor inverter according to claim 1, prior to performing a simulation calculation on a primary circuit model of the motor inverter to determine electromagnetic compatibility simulation parameters of the motor inverter, comprising:
and normalizing the power module characterization circuit model in the primary circuit model of the motor inverter.
6. A modeling apparatus of a motor inverter, comprising:
the structure parameter acquisition module is used for acquiring the structure parameters of each component in the motor inverter; the components of the motor inverter comprise a shielding cable circuit, a direct current bus capacitor circuit, a power switch circuit, a motor load and an inverter shell;
the component model building module is used for building a circuit model of each component in the motor inverter in a one-to-one correspondence manner according to the structural parameters of each component in the motor inverter; the circuit model comprises a shielding cable circuit model, a direct current bus capacitor circuit model, a power module characterization circuit model, a motor module circuit model and an inverter shell circuit model;
a motor inverter model determination module for determining a circuit model of the motor inverter based on the shielded cable circuit model, the dc bus capacitive circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter housing circuit model;
wherein the motor inverter model determination module comprises:
the measurement parameter acquisition unit is used for acquiring actual electromagnetic compatibility measurement parameters of the motor inverter based on an electromagnetic compatibility tester;
a primary motor inverter model determining unit, configured to determine a primary circuit model of the motor inverter according to the shielded cable circuit model, the dc bus capacitance circuit model, the power module characterization circuit model, the motor module circuit model, and the inverter casing circuit model;
the simulation parameter determining unit is used for performing simulation calculation on a primary circuit model of the motor inverter and determining an electromagnetic compatibility simulation parameter of the motor inverter;
the parameter judging unit is used for judging whether the electromagnetic compatibility simulation parameter is higher than the electromagnetic compatibility measurement parameter;
the second adjusting unit is used for adjusting the structural parameters of each component in the motor inverter when the electromagnetic compatibility simulation parameters are higher than the electromagnetic compatibility measurement parameters;
and the second returning unit is used for taking the adjusted structural parameters as the structural parameters for establishing the primary circuit models of the components in the motor inverter and returning to the step of establishing the circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter.
7. The modeling apparatus of a motor inverter according to claim 6, wherein the component model building module includes:
the actual impedance parameter acquisition unit is used for acquiring actual impedance parameters of all components in the motor inverter based on the impedance analyzer;
the primary component model establishing unit is used for establishing primary circuit models of all components in the motor inverter in a one-to-one correspondence mode according to the structural parameters of all the components in the motor inverter;
the simulation impedance parameter determining unit is used for respectively simulating the primary circuit models of the components in the motor inverter and determining the simulation impedance parameters of the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner;
the parameter deviation determining unit is used for determining the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter in a one-to-one correspondence manner;
a deviation judging unit, configured to judge whether the parameter deviation is smaller than a preset deviation;
the first adjusting unit is used for adjusting the structural parameters of each component in the motor inverter in a one-to-one correspondence manner according to the parameter deviation of each component in the motor inverter when the parameter deviation is larger than a preset deviation;
and the first returning unit is used for taking the adjusted structural parameters as the structural parameters for establishing the primary circuit models of the components in the motor inverter and returning to the step of establishing the primary circuit models of the components in the motor inverter in a one-to-one correspondence manner according to the structural parameters of the components in the motor inverter.
8. The modeling apparatus of a motor inverter according to claim 7, wherein the component model building module further includes:
and the component model building unit is used for taking the current primary circuit model of each component in the motor inverter as the circuit model of each component in the motor inverter when the parameter deviation between the actual impedance parameter and the simulated impedance parameter of each component in the motor inverter is smaller than the preset deviation.
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