CN111597731B - Model selection method and device for three-phase variable frequency speed control system and readable storage medium - Google Patents
Model selection method and device for three-phase variable frequency speed control system and readable storage medium Download PDFInfo
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Abstract
The invention discloses a model selection method, a device and a readable storage medium for a three-phase variable frequency speed control system, wherein the method comprises the following steps: calculating rated parameters of a rectifier diode according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model; determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection fixed value of the frequency converter; determining voltage-withstanding parameters of a switching device of the inverter according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed control system; and designing a three-phase variable frequency speed regulating system according to the rated parameters, the capacitance value and the voltage-withstanding parameters. The three-phase variable frequency speed control system obtained by the method can be used for immunizing a single-phase voltage sag of a power grid, greatly enhancing the reliability of equipment operation and improving the production benefit.
Description
Technical Field
The invention relates to the technical field of speed control systems, in particular to a model selection method and device for a three-phase variable-frequency speed control system and a computer readable storage medium.
Background
In a low-voltage distribution network, a power grid fault, a lightning stroke, high altitude drift and other factors can cause a voltage sag accident of a power consumer. The three-phase variable frequency speed control system is production equipment commonly used by industrial users, and is widely applied due to good speed control performance and good economical efficiency. However, the frequency converter is a device sensitive to voltage sag, and when the voltage sag depth exceeds 30%, the frequency converter can trip due to undervoltage protection when the duration exceeds dozens of microseconds. In recent years, due to the fact that a frequency converter trips caused by voltage sag, more and more electric energy quality accidents are caused, and the economic loss is increased.
In a conventional frequency converter design, power devices of a rectifying circuit and an inverter circuit of the frequency converter are selected according to rated power of the frequency converter, however, under the condition that the frequency converter works in a power grid voltage sag, current flowing through the power devices, voltage borne by two ends of the power devices and a voltage pulsation range of a filter capacitor on a direct current side can all generate obvious changes, when a related protection fixed value is exceeded, the frequency converter trips, and a production line cannot normally run.
In order to improve the voltage sag tolerance of the frequency converter, the existing method is to add a voltage sag compensation device, which can be mainly divided into a direct current scheme and an alternating current scheme. In the direct-current scheme, when voltage sag of a power grid is detected, an energy storage device (such as a storage battery) is put into a direct-current bus of a frequency converter, and the energy required by a load is provided by the storage battery; the alternating-current scheme is that an energy storage device is added on an alternating-current side, and when the voltage of a power grid drops temporarily, the energy storage device supplies power to the frequency converter. Therefore, no matter the direct current scheme or the alternating current scheme needs to be added with energy storage equipment and a change-over switch, abnormal work of the links can cause abnormal work of the speed regulating system of the frequency converter, and therefore the overall reliability is reduced. And these solutions are not economical enough due to the high price of stored energy.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the present invention aims to provide a method, an apparatus and a computer readable storage medium for selecting a type of a three-phase variable frequency speed control system, so as to achieve reasonable selection of relevant parameters of each component of the speed control system, enhance the reliability of equipment operation and improve the production efficiency.
One of the purposes of the invention is realized by the technical scheme, and the model selection method of the three-phase variable frequency speed control system comprises the following steps:
determining rated parameters of a rectifier diode according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection fixed value of the frequency converter;
determining voltage-withstanding parameters of a switching device of the inverter according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed regulation system;
and determining the three-phase variable frequency speed regulating system according to the rated parameter, the capacitance value and the withstand voltage parameter.
Optionally, the predetermining the maximum depth of the voltage sag of the ac side of the three-phase variable frequency speed control system includes:
determining the maximum depth of voltage sag at the AC side of the three-phase variable frequency speed control system according to the statistical data, or
The maximum depth is treated as a voltage drop of some sort to 0V.
Optionally, the predetermining three-phase variable frequency speed control system model includes:
and carrying out load equivalence on the three-phase variable-frequency speed regulation system to obtain the three-phase variable-frequency speed regulation system model.
Optionally, the determining rated parameters of the rectifier diode according to the predetermined maximum depth of the voltage sag at the ac side of the three-phase variable frequency speed control system and the model of the three-phase variable frequency speed control system includes:
and calculating the withstand voltage value and the current rated value of the rectifier diode according to the predetermined maximum voltage sag depth of the alternating-current side of the three-phase variable-frequency speed regulation system and the three-phase variable-frequency speed regulation system model.
Optionally, the determining, according to the ripple limit value of the dc filter capacitor of the three-phase variable frequency speed control system and the undervoltage protection fixed value of the frequency converter, the capacitance value of the dc side of the three-phase variable frequency speed control system includes:
and determining the capacitance value of the direct current side of the three-phase variable-frequency speed control system according to the condition that the lower limit value of the direct current filter capacitor ripple of the three-phase variable-frequency speed control system is higher than the undervoltage protection fixed value of the frequency converter.
Optionally, the determining the withstand voltage parameter of the inverter switching device according to the capacitor voltage and the load power at the dc side of the three-phase variable frequency speed control system includes:
and determining the withstand voltage value and the current withstand value of the switching device of the inverter according to the average value of the capacitor voltage at the direct current side of the three-phase variable frequency speed control system and the load power.
Optionally, after determining the three-phase variable-frequency speed control system according to the rated parameter, the capacitance value and the withstand voltage parameter, the method further includes:
and verifying the obtained three-phase variable-frequency speed regulating system through simulation or experiment.
The second purpose of the invention is realized by the technical scheme, and the model selection device of the three-phase variable frequency speed control system comprises:
the rated parameter calculating unit is used for determining rated parameters of the rectifier diodes according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
the capacitance value calculation unit is used for determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection fixed value of the frequency converter;
the voltage-withstanding parameter calculation unit is used for determining voltage-withstanding parameters of the inverter switching device according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed control system;
and the model selection unit is used for determining the three-phase variable-frequency speed regulation system according to the rated parameter, the capacitance value and the voltage-withstanding parameter.
The third object of the present invention is achieved by the technical solution, which is a computer readable storage medium, wherein an implementation program for information transmission is stored on the computer readable storage medium, and when the program is executed by a processor, the method for model selection of the three-phase variable frequency speed control system is implemented.
Due to the adoption of the technical scheme, the invention has the following advantages: the method introduces the maximum depth of voltage sag of the alternating current side of the three-phase variable-frequency speed regulation system, the ripple limit value of the direct current filter capacitor of the three-phase variable-frequency speed regulation system, and the capacitor voltage and the load power of the direct current side of the three-phase variable-frequency speed regulation system to select the type of the components of the three-phase variable-frequency speed regulation system, so that the relevant parameters of a power device and the parameter value of the direct current filter capacitor can be reasonably selected.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-phase variable frequency speed control system according to a second embodiment of the present invention;
FIG. 3 is a flow chart of a second embodiment of the present invention;
FIG. 4 shows an AC input voltage and an output voltage of a rectifier circuit according to a second embodiment of the present invention;
FIG. 5 is a circuit diagram of a second embodiment of the present invention after load equalization;
fig. 6 shows an ac input voltage and a rectifier circuit output voltage obtained by simulation according to a second embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example one
The first embodiment of the present invention provides a model selection method for a three-phase variable frequency speed control system, as shown in fig. 1, including the following steps:
s10, determining rated parameters of a rectifier diode according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable frequency speed control system and the three-phase variable frequency speed control system model;
s20, determining a capacitance value of the DC side of the three-phase variable frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable frequency speed control system and the undervoltage protection fixed value of the frequency converter;
s30, determining voltage withstanding parameters of the inverter switching device according to the capacitor voltage and the load power on the direct current side of the three-phase variable frequency speed control system;
and S40, determining the three-phase variable frequency speed regulating system according to the rated parameter, the capacitance value and the voltage-withstanding parameter.
The method introduces the maximum depth of voltage sag of the alternating current side of the three-phase variable-frequency speed regulation system, the ripple limit value of the direct current filter capacitor of the three-phase variable-frequency speed regulation system, and the capacitor voltage and the load power of the direct current side of the three-phase variable-frequency speed regulation system to select the type of the components of the three-phase variable-frequency speed regulation system, so that the relevant parameters of a power device and the parameter value of the direct current filter capacitor can be reasonably selected.
Optionally, the predetermining the maximum depth of voltage sag at the ac side of the three-phase variable-frequency speed control system includes:
determining the maximum depth of voltage sag at the AC side of the three-phase variable frequency speed control system according to the statistical data, or
The maximum depth is treated as a voltage drop of some sort to 0V.
Specifically, in this embodiment, the maximum depth of the voltage sag at the ac side of the three-phase variable frequency speed control system is determined according to the statistical data, and if there is no statistical data, a certain phase voltage can be directly decreased to 0V.
Optionally, the predetermining three-phase variable frequency speed control system model includes:
and carrying out load equivalence on the three-phase variable-frequency speed regulation system to obtain the three-phase variable-frequency speed regulation system model.
Specifically, in this embodiment, the inverter and the motor load may be equivalent to one impedance according to the load power, and the model of the system is simplified, so as to obtain the three-phase variable frequency speed control system model required by the calculation.
Optionally, the determining rated parameters of the rectifier diode according to the predetermined maximum depth of the voltage sag at the ac side of the three-phase variable frequency speed control system and the model of the three-phase variable frequency speed control system includes:
and calculating the withstand voltage value and the current rated value of the rectifier diode according to the predetermined maximum voltage sag depth of the alternating-current side of the three-phase variable-frequency speed regulation system and the three-phase variable-frequency speed regulation system model.
Optionally, the determining, according to the ripple limit value of the dc filter capacitor of the three-phase variable frequency speed control system and the undervoltage protection fixed value of the frequency converter, the capacitance value of the dc side of the three-phase variable frequency speed control system includes:
and determining the capacitance value of the direct current side of the three-phase variable-frequency speed control system according to the condition that the lower limit value of the direct current filter capacitor ripple of the three-phase variable-frequency speed control system is higher than the undervoltage protection fixed value of the frequency converter.
Specifically, in this embodiment, according to the determined voltage sag depth and the three-phase variable frequency speed control system model, a withstand voltage value and a current rated value of the current flowing through the rectifier diode are calculated, and according to the fact that a lower limit value of a ripple of the dc filter capacitor is higher than an undervoltage protection fixed value of the frequency converter, a value of the dc-side capacitor is calculated.
Optionally, the determining the withstand voltage parameter of the inverter switching device according to the capacitor voltage and the load power at the dc side of the three-phase variable frequency speed control system includes:
and determining the withstand voltage value and the current withstand value of the switching device of the inverter according to the average value of the capacitor voltage at the direct current side of the three-phase variable frequency speed control system and the load power.
Specifically, in this embodiment, the withstand voltage value and the withstand current value of the inverter switching device are calculated from the average value of the dc-side capacitor voltage and the load power.
Optionally, after determining the three-phase variable-frequency speed control system according to the rated parameter, the capacitance value and the withstand voltage parameter, the method further includes:
and verifying the obtained three-phase variable-frequency speed regulating system through simulation or experiment.
Specifically, after the parameters of each device are obtained, in this embodiment, the system is verified by using a test or simulation method to determine the performance of the system.
In conclusion, the method firstly calculates the maximum voltage-resistant current-tolerant value of the rectifier diode according to the maximum depth of voltage sag of the alternating current side of the three-phase variable-frequency speed regulation system, and ensures that the rectifier circuit can tolerate increased current when a single-phase voltage sag accident occurs by reasonably selecting the parameters of the rectifier diode; the value of the direct current side capacitor is calculated according to the fact that the lower limit value of the ripple wave of the direct current filter capacitor is higher than the undervoltage protection fixed value of the frequency converter, and the direct current side capacitor can be guaranteed not to trip due to undervoltage protection caused by too low voltage when single-phase voltage sag occurs; and calculating the voltage and current resistance value of the switching device of the inverter according to the average value of the voltage of the direct-current side capacitor and the load power, so that the inverter can normally work in a single-phase voltage sag working state.
The method provided by the invention is used for analyzing the most serious working state of single-phase voltage sag at the AC side of the three-phase variable-frequency speed regulation system, and the immunity of the three-phase variable-frequency speed regulation system to the single-phase voltage sag of the power grid is obviously improved by reasonably selecting the parameters of a hardware system.
Example two
The second embodiment of the present invention provides an implementation case of a model selection method for a three-phase variable frequency speed control system, as shown in fig. 3, which is based on the schematic diagram of the three-phase variable frequency speed control system shown in fig. 2, and includes the following steps:
s00, determining the maximum depth of voltage sag of the alternating current side of the three-phase variable frequency speed control system, and determining a three-phase variable frequency speed control system model;
in this embodiment, the most serious condition of single-phase voltage sag is directly considered, and the R-phase voltage is directly decreased to 0V, that is:
u R ＝0V (1)
the inverter and the motor load are equivalent to form an impedance according to the load power, and the model of the system is simplified to obtain a three-phase variable frequency speed regulation system model:
in this embodiment, assuming that the load is a constant torque load T equal to 10N × m and the rated rotation speed r equal to 1000r/min, the load power is:
u R when the voltage is 0V, the three-phase ac voltage waveform and the output voltage of the rectifier circuit are as shown in fig. 4, and the average value of the output voltage of the rectifier circuit can be obtained from fig. 4:
for the inverter and the motor load with the output power of P (power loss caused by friction is neglected), the direct-current side input impedance is equivalent to a resistor R in the embodiment, and the following requirements are met:
thus, as shown in fig. 5, a simplified model of the three-phase variable frequency speed control system can be obtained.
S10, determining rated parameters of a rectifier diode according to the maximum depth of voltage sag at the AC side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
calculating rated parameters including withstand voltage value and current rated value of a current-passing rectifier diode, and comprises the following steps;
according to FIG. 4, the maximum voltage u experienced by the diodes in the rectifier m Is u S -u T Wherein:
it can be seen that when ω t is 0:
U m ≈539V (6)
according to the principle of selecting the withstand voltage value of the diode, the withstand voltage value of the diode can be selected as follows:
U VD ＝2*U m ＝1078V (7)
the average value of the rectifier dc current is:
according to u m Time and u S -u T The difference of the time equal to the average DC voltage can be used to determine the time t for the diode to conduct 1 ：
The rating of the rectifier diode can be taken to be 2 times the average value.
S20, determining the value of the direct current side capacitance;
in this embodiment, the minimum value of the dc voltage ripple is:
U min ＝U dav (1-θ),θ∈(0,1) (10)
according to the requirement of undervoltage protection of a certain type of frequency converter, when the voltage of a direct current bus is lower than 70% of rated voltage, the undervoltage protection trips, so that the following steps can be taken: θ is 0.3.
In order to ensure that the frequency converter does not trip when the single-phase voltage is temporarily dropped, the discharge of the capacitor to the minimum voltage is higher than U min Namely:
τ is the time constant, t 2 Is the capacitor discharge time. Can find C9.12 x 10 -5 And a certain margin is reserved for preventing system tripping caused by other interference, and the rated value of the direct current side capacitor is taken as:
C 1 ＝1.5*C＝1.37*10 -4 (12)
s30, determining voltage withstanding parameters of the inverter switching device according to the capacitor voltage and the load power on the direct current side of the three-phase variable frequency speed control system;
in this embodiment, the IGBT withstand voltage value is:
U I ＝2U m ＝1078V (13)
in this embodiment, the current rating of the IGBT is:
I I ＝1.5I av ＝0.42A (14)
and S40, designing the three-phase variable frequency speed control system according to the rated parameters, the capacitance values and the voltage-withstanding parameters.
And designing a three-phase variable-frequency speed regulating system based on the obtained device parameters.
S50, verifying the system by adopting a test or simulation method
The three-phase variable-frequency speed regulation system is established according to the parameters and verified by adopting a test or simulation, the test result that the voltage of the R-phase is 0 in the simulation is shown in figure 6, and the voltage of the capacitor at the direct-current side always works at U min In the above, the rectifier circuit and the inverter circuit do not operate for protection beyond the rated value, which proves that the design scheme is effective.
The method of the invention deduces the average value of the current flowing through the power device and the condition of voltage bearing at the two ends by comparing the characteristics of the normal operation of the three-phase variable frequency speed control system and the single-phase short circuit fault operation of the power grid, thereby reasonably selecting the relevant parameters of the power device. And then deducing an analytical expression of the ripple of the DC side voltage after the fault, and combining the analytical expression with the undervoltage protection fixed value of the frequency converter to deduce a parameter value of the DC filter capacitor. The three-phase variable frequency speed control system designed by the design method can be used for immunizing the single-phase voltage sag of the power grid, greatly enhancing the reliability of equipment operation and improving the production benefit.
EXAMPLE III
The third embodiment of the present invention provides a model selection device for a three-phase variable frequency speed control system, which comprises:
the rated parameter calculating unit is used for calculating the rated parameters of the rectifier diodes according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
the capacitance value calculation unit is used for determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection constant value of the frequency converter;
the voltage-withstanding parameter calculation unit is used for determining voltage-withstanding parameters of the inverter switching device according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed control system;
and the model selection unit is used for designing the three-phase variable-frequency speed regulation system according to the rated parameters, the capacitance values and the voltage-withstanding parameters.
The three-phase variable frequency speed control system obtained by the device can be used for immunity of single-phase voltage sag of a power grid, the reliability of equipment operation is greatly enhanced, and the production benefit is improved.
Example four
The third embodiment of the present invention provides a computer-readable storage medium, where an implementation program for information transmission is stored on the computer-readable storage medium, and when the implementation program is executed by a processor, the method for model selection of a three-phase variable-frequency speed control system is implemented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered thereby.
Claims (4)
1. A model selection method for a three-phase variable frequency speed control system is characterized by comprising the following steps:
determining rated parameters of a rectifier diode according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection fixed value of the frequency converter;
determining voltage-withstanding parameters of a switching device of the inverter according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed regulation system;
determining the three-phase variable frequency speed regulating system according to the rated parameter, the capacitance value and the voltage-withstanding parameter;
the predetermining the maximum depth of voltage sag of the alternating-current side of the three-phase variable-frequency speed control system comprises the following steps:
determining the maximum depth of voltage sag at the AC side of the three-phase variable frequency speed control system according to the statistical data, or
Processing the maximum depth according to a certain voltage drop to 0V;
the predetermined three-phase variable frequency speed control system model comprises:
carrying out load equivalence on a three-phase variable-frequency speed regulation system to obtain a three-phase variable-frequency speed regulation system model;
the method for determining the rated parameters of the rectifier diode according to the predetermined maximum depth of the voltage sag of the alternating-current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model comprises the following steps:
calculating the withstand voltage value and the current rated value of a rectifier diode according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed regulation system and the three-phase variable-frequency speed regulation system model;
the capacitance value of the direct current side of the three-phase variable frequency speed control system is determined according to the ripple limit value of the direct current filter capacitor of the three-phase variable frequency speed control system and the undervoltage protection fixed value of the frequency converter, and the method comprises the following steps:
determining the capacitance value of the direct current side of the three-phase variable-frequency speed control system according to the condition that the lower limit value of the direct current filter capacitor ripple of the three-phase variable-frequency speed control system is higher than the undervoltage protection fixed value of the frequency converter;
the method for determining the voltage-withstanding parameters of the switching devices of the inverter according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed control system comprises the following steps:
and determining the withstand voltage value and the current withstand value of the switching device of the inverter according to the average value of the capacitor voltage at the direct current side of the three-phase variable frequency speed control system and the load power.
2. The model selection method for the three-phase variable frequency speed control system according to claim 1, wherein after determining the three-phase variable frequency speed control system according to the rated parameter, the capacitance value and the withstand voltage parameter, the method further comprises:
and verifying the obtained three-phase variable-frequency speed regulating system through simulation or experiment.
3. A three-phase variable frequency speed control system model selection device is applied to the three-phase variable frequency speed control system model selection method according to any one of claims 1 or 2, and comprises the following steps:
the rated parameter calculating unit is used for determining rated parameters of the rectifier diodes according to the predetermined maximum depth of voltage sag at the alternating current side of the three-phase variable-frequency speed control system and the three-phase variable-frequency speed control system model;
the capacitance value calculation unit is used for determining the capacitance value of the DC side of the three-phase variable-frequency speed control system according to the ripple limit value of the DC filter capacitor of the three-phase variable-frequency speed control system and the undervoltage protection fixed value of the frequency converter;
the voltage-withstanding parameter calculation unit is used for determining voltage-withstanding parameters of the inverter switching device according to the capacitor voltage and the load power at the direct current side of the three-phase variable-frequency speed control system;
and the model selection unit is used for determining the three-phase variable-frequency speed regulation system according to the rated parameter, the capacitance value and the voltage-withstanding parameter.
4. A computer-readable storage medium, on which an information-transfer implementing program is stored, which, when executed by a processor, implements the method for model selection of a three-phase variable frequency speed control system according to any one of claims 1 or 2.
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