CN113726256B - Reconstruction system of instantaneous voltage fundamental wave signal and alternating current motor drive control device - Google Patents
Reconstruction system of instantaneous voltage fundamental wave signal and alternating current motor drive control device Download PDFInfo
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- CN113726256B CN113726256B CN202111011833.4A CN202111011833A CN113726256B CN 113726256 B CN113726256 B CN 113726256B CN 202111011833 A CN202111011833 A CN 202111011833A CN 113726256 B CN113726256 B CN 113726256B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/12—Observer control, e.g. using Luenberger observers or Kalman filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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Abstract
The application discloses a reconstruction system of an instantaneous voltage fundamental wave signal and an alternating current motor drive control device, which comprise a direct current voltage detection module, a motor voltage sampling module and a processing module, wherein the direct current voltage detection module can collect direct current voltage of a direct current side of a frequency converter, the motor voltage sampling module can generate three-phase digital pulse voltage signals according to three-phase pulse voltage and the direct current voltage of an alternating current motor, and the processing module carries out phase voltage pulse conversion and digital integration processing based on the direct current voltage and the three-phase digital pulse voltage signals so as to reconstruct the three-phase instantaneous voltage fundamental wave signal of the alternating current motor, thereby being convenient for a closed loop control system to control the frequency converter, and enabling the alternating current motor to operate according to the requirements of users after the alternating current motor is controlled.
Description
Technical Field
The application relates to the field of motor control, in particular to a reconstruction system of an instantaneous voltage fundamental wave signal and an alternating current motor driving control device.
Background
In the prior art, when an ac motor is driven, a variable frequency is generally used for driving control, a specific control circuit is shown in fig. 1, fig. 1 is a schematic diagram of a driving device of the ac motor in the prior art, wherein the variable frequency is arranged between an ac power supply and the ac motor, and a motor driving control system controls the action state of each switching tube in the variable frequency to enable the variable frequency to output a desired driving voltage to drive the ac motor. Only the instantaneous voltage fundamental wave signal satisfies the desire, the ac motor is operated according to the desire of the user, and therefore, the motor drive control system is generally provided with a control module which performs closed-loop control on the switching tube of the frequency converter based on the instantaneous voltage fundamental wave signal of the ac motor and the voltage of the ac power source to adjust the instantaneous voltage fundamental wave signal of the ac motor, and therefore, the instantaneous voltage fundamental wave signal is an important input to the observer in the motor drive control system, and the observer converts the instantaneous voltage fundamental wave signal of the ac motor and inputs the converted instantaneous voltage fundamental wave signal to the control module so that the control module controls the switching tube in the frequency converter. However, the actual instantaneous voltage of the ac motor is a time-continuous PWM (Pulse width modulation ) pulse sequence output by the inverter circuit in the frequency converter, which includes an instantaneous voltage fundamental wave signal and various harmonics, referring to fig. 2, fig. 2 is a schematic diagram of the PWM pulse sequence and the instantaneous voltage fundamental wave signal output by the inverter circuit in the prior art, so that the instantaneous voltage fundamental wave signal cannot be directly sampled and obtained by the sensor, and only can be indirectly extracted or reconstructed.
Disclosure of Invention
The application aims to provide a reconstruction system of an instantaneous voltage fundamental wave signal and an alternating current motor driving control device, wherein a motor voltage sampling module can generate a three-phase digital pulse voltage signal according to a three-phase pulse voltage and a direct current voltage of an alternating current motor, and a processing module performs phase voltage pulse conversion and digital integration processing based on the direct current voltage and the three-phase digital pulse voltage signal so as to reconstruct the three-phase instantaneous voltage fundamental wave signal of the alternating current motor, thereby being convenient for a closed-loop control system to control a frequency converter, and enabling the alternating current motor to operate according to the expectations of users after the alternating current motor is controlled.
In order to solve the above technical problems, the present application provides a system for reconstructing an instantaneous voltage fundamental wave signal, including:
the direct-current voltage detection module is connected with the frequency converter and is used for collecting direct-current voltage of the direct-current side of the frequency converter;
the motor voltage sampling module is connected with the output end of the frequency converter and the input end of the alternating current motor, and is connected with the direct current voltage detection module, and is used for collecting three-phase pulse voltage output by the frequency converter and generating a three-phase digital pulse voltage signal based on the three-phase pulse voltage and the direct current voltage;
and the processing module is respectively connected with the direct-current voltage detection module and the motor voltage sampling module and is used for carrying out phase voltage pulse conversion and digital integration processing based on the direct-current voltage and the three-phase digital pulse voltage signals so as to determine three-phase instantaneous voltage fundamental wave signals of the alternating-current motor.
Preferably, the direct current voltage detection module includes:
the first voltage dividing module is connected with the frequency converter at a first end and used for reducing the voltage of the direct current side of the frequency converter to direct current voltage within a preset voltage range;
the input end of the analog-to-digital conversion module is connected with the second end of the first voltage division module and is used for converting the direct-current voltage in the preset voltage range into digital direct-current voltage;
the motor voltage sampling module is specifically used for collecting the three-phase pulse voltage output by the frequency converter and generating the three-phase digital pulse voltage signal based on the three-phase pulse voltage and the direct-current voltage in the preset voltage range;
the processing module is specifically configured to perform the phase voltage pulse conversion and the digital integration processing based on the digital direct current voltage and the three-phase digital pulse voltage signal, so as to determine the three-phase instantaneous voltage fundamental wave signal.
Preferably, the direct current voltage detection module further comprises:
and the following amplifier is arranged between the first voltage dividing module and the analog-to-digital conversion module and is used for following the direct-current voltage in the preset voltage range output by the first voltage dividing module.
Preferably, the first voltage dividing module includes a first voltage dividing resistor.
Preferably, the motor voltage sampling module includes:
the second voltage dividing module is connected with the output end of the frequency converter and the input end of the alternating current motor and is used for reducing the three-phase pulse voltage output by the frequency converter into three-phase pulse voltage within the preset voltage range;
and the comparison module is respectively connected with the second voltage division module and the following amplifier and is used for respectively shaping the three-phase pulse voltage in the preset voltage range based on the direct current voltage in the preset voltage range so as to output the three-phase digital pulse voltage signal.
Preferably, the second voltage dividing module includes a second voltage dividing resistor.
Preferably, the motor voltage sampling module further comprises:
and the isolation module is arranged between the comparison module and the processing module and is used for electrically isolating signals between the comparison module and the processing module and carrying out level conversion on the three-phase digital pulse voltage signals based on the power supply voltage of the processing module.
Preferably, the isolation module includes:
the optical coupler is connected with the comparison module and is used for electrically isolating signals between the comparison module and the processing module;
and the level conversion module is arranged between the optocoupler and the processing module and is used for carrying out level conversion on the three-phase digital pulse voltage signal based on the power supply voltage of the processing module.
Preferably, the processing module is specifically configured to sample the three-phase digital pulse voltage signal based on a self-clock frequency, where the self-clock frequency is higher than a switching frequency of the frequency converter; performing phase voltage pulse conversion based on the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling to calculate N three-phase Pulse Width Modulation (PWM) phase voltages in each clock period, wherein N is the ratio of the self clock frequency to the switching frequency of the frequency converter; and carrying out digital integration processing on N PWM phase voltages in each clock period to determine three-phase instantaneous voltage fundamental wave signals of the alternating current motor in each clock period.
In order to solve the technical problems, the application provides an alternating current motor driving control device, which comprises the reconstruction system of the instantaneous voltage fundamental wave signal, an alternating current power supply, a frequency converter, an observer and a control module, wherein the output end of the alternating current power supply is connected with the frequency converter, the reconstruction system of the instantaneous voltage fundamental wave signal is respectively connected with the frequency converter and the output end of the frequency converter, the observer is connected with the reconstruction system of the instantaneous voltage fundamental wave signal, and the control module is connected with the observer;
the frequency converter is used for outputting expected driving voltage based on alternating current output by the alternating current power supply so as to drive the alternating current motor;
the observer is used for converting three-phase instantaneous voltage fundamental wave signals of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signals into the control module;
the control module is used for controlling each switching tube in the frequency converter based on the setting of a user and the three-phase instantaneous voltage fundamental wave signal so that the frequency converter outputs the expected driving voltage.
The application provides a reconstruction system of an instantaneous voltage fundamental wave signal and an alternating current motor drive control device, which comprise a direct current voltage detection module, a motor voltage sampling module and a processing module, wherein the direct current voltage detection module can collect direct current voltage of a direct current side of a frequency converter, the motor voltage sampling module can generate three-phase digital pulse voltage signals according to three-phase pulse voltage and the direct current voltage of an alternating current motor, and the processing module carries out phase voltage pulse conversion and digital integration processing based on the direct current voltage and the three-phase digital pulse voltage signals so as to reconstruct the three-phase instantaneous voltage fundamental wave signal of the alternating current motor, thereby being convenient for a closed loop control system to control the frequency converter, and enabling the alternating current motor to operate according to the requirements of users after the alternating current motor is controlled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art AC motor drive apparatus;
FIG. 2 is a schematic diagram of a PWM pulse train and instantaneous voltage fundamental wave signal output by an inverter circuit in the prior art;
FIG. 3 is a schematic diagram of a system for reconstructing an instantaneous voltage fundamental signal according to the present application;
FIG. 4 is a schematic diagram of a prior art reconstruction system for an instantaneous voltage fundamental signal;
FIG. 5 is a schematic diagram of another prior art reconstruction system for transient voltage fundamental signals;
fig. 6 is a schematic diagram of a specific structure of a reconstruction system of an instantaneous voltage fundamental wave signal according to the present application.
Detailed Description
The application provides a reconstruction system of instantaneous voltage fundamental wave signals and an alternating current motor drive control device, wherein a motor voltage sampling module can generate three-phase digital pulse voltage signals according to three-phase pulse voltages and direct current voltages of an alternating current motor, and a processing module carries out phase voltage pulse conversion and digital integration processing based on the direct current voltages and the three-phase digital pulse voltage signals so as to reconstruct the three-phase instantaneous voltage fundamental wave signals of the alternating current motor, thereby being convenient for a closed-loop control system to control a frequency converter, and enabling the alternating current motor to operate according to the expectations of users after the alternating current motor is controlled.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a reconstruction system of an instantaneous voltage fundamental wave signal according to the present application, the system includes:
the direct-current voltage detection module 1 is connected with the frequency converter and is used for collecting direct-current voltage of the direct-current side of the frequency converter;
the motor voltage sampling module 2 is connected with the output end of the frequency converter and the input end of the alternating current motor, and is connected with the direct current voltage detection module 1, and is used for collecting three-phase pulse voltage output by the frequency converter and generating a three-phase digital pulse voltage signal based on the three-phase pulse voltage and the direct current voltage;
and the processing module 3 is respectively connected with the direct-current voltage detection module 1 and the motor voltage sampling module 2 and is used for carrying out phase voltage pulse conversion and digital integration processing based on the direct-current voltage and the three-phase digital pulse voltage signals so as to determine three-phase instantaneous voltage fundamental wave signals of the alternating-current motor.
In the prior art, a frequency converter is generally used for driving and controlling an ac motor, and in order to ensure that the ac motor operates according to expected conditions, closed-loop control is generally used for the ac motor, that is, the voltage input to the ac motor is adjusted according to the expected voltage and the actual voltage of the coil of the ac motor, so that the actual voltage of the coil of the ac motor is the expected voltage. However, because the actual instantaneous voltage of the ac motor is the output voltage of the inverter circuit in the frequency converter, and the output voltage of the inverter circuit is a series of PWM pulse sequences with continuous time, including the instantaneous voltage fundamental wave signal and each subharmonic voltage, only the instantaneous voltage fundamental wave signal is an important parameter for closed-loop control in the driving control of the ac motor, which directly affects the control and operation performance of the ac motor, and because of the harmonic voltage, the instantaneous voltage fundamental wave signal cannot be directly sampled and extracted, and can only be indirectly extracted or reconstructed.
In the prior art, when the instantaneous voltage fundamental wave signal is extracted, the first scheme is to directly adopt the reference voltage output by the control module in the motor drive control system, please refer to fig. 4, fig. 4 is a schematic diagram of a reconstruction system of the instantaneous voltage fundamental wave signal in the prior art, the voltage of the coil of the alternating current motor does not need to be collected and measured, the instantaneous voltage fundamental wave signal of the coil of the alternating current motor and the reference voltage output by the control module are kept consistent theoretically, but due to the influence of voltage drop and bridge arm dead time when the switching device of the inverter circuit in the frequency converter is conducted, certain difference exists between the reference voltage and the actual instantaneous voltage fundamental wave signal of the coil of the alternating current motor, at this time, nonlinear algorithm of the inverter circuit is usually adopted for compensation, but the compensation method is greatly influenced by the characteristic parameters, temperature drift, current zero crossing point detection precision and the like of the switching device in the inverter circuit, especially under the conditions of low speed and light load of the alternating current motor, the current signal zero crossing point detection precision of the alternating current motor is low, and the difference between the actual instantaneous voltage fundamental wave signal and the reference voltage is further increased.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another reconstruction system of an instantaneous voltage fundamental wave signal in the prior art, in which an analog sampling circuit is used to directly collect and measure the voltage of a coil of an ac motor, and a hardware low-pass filter circuit is used to extract the instantaneous voltage fundamental wave signal component, but the hardware low-pass filter circuit has the defects of amplitude attenuation, phase delay, fixed cutoff frequency and the like, especially under the variable-frequency speed regulation working condition of the ac motor, the implementation process of compensating the amplitude and the phase is very complex, the instantaneity and the accuracy of the instantaneous voltage fundamental wave signal are affected, and in addition, because the voltage of the ac motor is a PWM pulse, the analog sampling circuit easily introduces high-frequency noise into the motor drive control system, and the reliability of the motor drive control system is affected.
In order to solve the technical problems, the application is provided with the direct-current voltage detection module 1 and the motor voltage sampling module 2 respectively, wherein the direct-current voltage detection module 1 can collect direct-current voltage of the direct-current side of the frequency converter, and the motor voltage sampling module 2 can generate three-phase digital pulse voltage signals based on three-phase pulse voltage and direct-current voltage output by the frequency converter, so that the processing module 3 performs phase voltage pulse conversion and digital integration processing to reconstruct three-phase instantaneous voltage fundamental wave signals of the alternating-current motor. The application has no influence of the low-pass filter circuit on the motor drive control system and no influence on the normal drive of the alternating current motor due to the self-limiting influence of the hardware low-pass filter circuit.
In summary, the motor voltage sampling module 2 in the application can generate three-phase digital pulse voltage signals according to the three-phase pulse voltage and the direct current voltage of the alternating current motor, and the processing module 3 performs phase voltage pulse conversion and digital integration processing based on the direct current voltage and the three-phase digital pulse voltage signals to reconstruct three-phase instantaneous voltage fundamental wave signals of the alternating current motor, so that a closed-loop control system is convenient for controlling the frequency converter, and the alternating current motor is enabled to operate according to the user's expectations after the alternating current motor is controlled.
Based on the above embodiments:
referring to fig. 6, fig. 6 is a schematic diagram of a reconstruction system of an instantaneous voltage fundamental wave signal according to the present application.
As a preferred embodiment, the direct voltage detection module 1 includes:
the first voltage dividing module is connected with the frequency converter at the first end and used for reducing the voltage of the direct current side of the frequency converter to direct current voltage within a preset voltage range;
the input end of the analog-to-digital conversion module is connected with the second end of the first voltage division module and is used for converting direct-current voltage in a preset voltage range into digital direct-current voltage;
the motor voltage sampling module 2 is specifically used for collecting three-phase pulse voltages output by the frequency converter and generating three-phase digital pulse voltage signals based on the three-phase pulse voltages and direct current voltages in a preset voltage range;
the processing module 3 is specifically configured to perform phase voltage pulse conversion and digital integration processing based on the digital dc voltage and the three-phase digital pulse voltage signal to determine a three-phase instantaneous voltage fundamental wave signal.
When the direct current detection module in the embodiment collects the direct current voltage of the direct current side of the frequency converter, the first voltage division module is connected to the direct current side of the frequency converter, and the voltage of the direct current side of the frequency converter is reduced to the direct current voltage within a preset voltage range (for example, 0-15V), so that the influence of the large voltage of the direct current side of the frequency converter on a rear-end device is avoided; the analog-to-digital conversion module converts the direct-current voltage reduced by the first voltage division module into digital direct-current voltage, so that the processing module 3 can process the digital direct-current voltage conveniently.
As a preferred embodiment, the dc voltage detecting module 1 further includes:
the following amplifier is arranged between the first voltage dividing module and the analog-to-digital conversion module and is used for following the direct-current voltage in the preset voltage range output by the first voltage dividing module.
In order to avoid voltage loss in the circuit, the following amplifier is further arranged in the embodiment, so that the voltage input to the analog-to-digital conversion module is ensured to be the direct-current voltage in the preset voltage range output by the first voltage division module, and the accuracy of the direct-current voltage output by the analog-to-digital conversion module is ensured.
As a preferred embodiment, the first voltage dividing module comprises a first voltage dividing resistor.
The first voltage dividing module in this embodiment may be, but not limited to, configured by a first voltage dividing resistor, and a plurality of first voltage dividing resistors may be provided to reduce the voltage on the dc side of the inverter to the dc voltage within the preset voltage range.
In addition, the divider resistor has the characteristics of low cost and convenient arrangement.
As a preferred embodiment, the motor voltage sampling module 2 includes:
the second voltage dividing module 21 is connected with the output end of the frequency converter and the input end of the alternating current motor and is used for reducing the three-phase pulse voltage output by the frequency converter into three-phase pulse voltage within a preset voltage range;
and the comparison module 22 is respectively connected with the second voltage division module 21 and the following amplifier and is used for respectively shaping the three-phase pulse voltage in the preset voltage range based on the direct current voltage in the preset voltage range so as to output a three-phase digital pulse voltage signal.
The second voltage dividing module 21 in this embodiment steps down the three-phase pulse voltage output by the frequency converter to a three-phase pulse voltage within a preset voltage range (for example, 0-15V), so that faults generated after the comparison module 22 inputs a large voltage are avoided; the comparison module in the present application compares the dc voltage in the preset voltage range with the three-phase pulse voltage in the preset voltage range, and when the three-phase pulse voltage is greater than the dc voltage, the comparison module 22 outputs a high level and not greater than a low level, so as to shape the three-phase pulse signal into a high-low level three-phase digital pulse voltage signal, so that the subsequent processing is directly performed according to the three-phase data pulse voltage signal.
As a preferred embodiment, the second voltage dividing module 21 comprises a second voltage dividing resistor.
The second voltage dividing module 21 in this embodiment may be, but not limited to, a second voltage dividing resistor, and a plurality of second voltage dividing resistors may be provided to reduce the voltage on the dc side of the inverter to the dc voltage within the preset voltage range.
As a preferred embodiment, the motor voltage sampling module 2 further comprises:
the isolation module 23 is disposed between the comparison module 22 and the processing module 3, and is configured to electrically isolate signals between the comparison module 22 and the processing module 3, and perform level conversion on the three-phase digital pulse voltage signal based on the supply voltage of the processing module 3.
As a preferred embodiment, the isolation module 23 comprises:
an optocoupler connected with the comparison module 22 and used for electrically isolating signals between the comparison module 22 and the processing module 3;
and the level conversion module is arranged between the optocoupler and the processing module 3 and is used for carrying out level conversion on the three-phase digital pulse voltage signal based on the power supply voltage of the processing module 3.
The isolation module 23 in this embodiment includes an optical coupler and a level conversion module, where the optical coupler can implement isolation of signals between the comparison module 22 and the processing module 3, and has the characteristics of low cost and simple connection mode; the level conversion module is capable of level converting the three-phase digital pulse voltage signal based on the power supply voltage of the processing module 3 so that the processing module 3 processes the three-phase digital pulse voltage signal.
As a preferred embodiment, the processing module 3 is specifically configured to sample the three-phase digital pulse voltage signal based on its own clock frequency, where the own clock frequency is higher than the switching frequency of the frequency converter; performing phase voltage pulse conversion based on the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling to calculate N three-phase Pulse Width Modulation (PWM) phase voltages in each clock period, wherein N is the ratio of the clock frequency of the phase voltage to the switching frequency of the frequency converter; and carrying out digital integration processing on N PWM phase voltages in each clock period to determine three-phase instantaneous voltage fundamental wave signals of the alternating current motor in each clock period.
The processing module 3 in this embodiment may be, but not limited to, an FPGA (Field Programmable Gate Array, field-programmable gate array) digital chip, and since the level of the FPGA digital chip is 3.3V, the isolation module 23 converts the three-phase digital pulse voltage signal into a digital pulse signal of 0V or 3.3V, and then sends the digital pulse signal to the FPGA digital chip in the FPGA digital chip, where the FPGA digital chip samples the three-phase digital pulse voltage signal and the dc voltage of the dc side of the frequency converter at the rising edge or the falling edge of each clock cycle; and based on the calculated three-phase PWM phase voltage of the motor, the calculation formula is as follows:
wherein V is a 、V b And V c Three-phase PWM phase voltages of motors a, b and c respectively, V dc Is the direct-current voltage of the direct-current side of the frequency converter, S a 、S b And S is c The three-phase digital pulse voltage signals of the motors a, b and c are respectively 0 or 1.
And storing the calculated N three-phase PWM phase voltages into three registers with depth N in the FPGA digital chip respectively. The data in the register is updated once every clock period, and the calculation formula of N is as follows:
wherein f c The self clock frequency of the FPGA digital chip is generally f c Can take the value of 1MHz-10MHz, f s N is typically an integer, which is the switching frequency of the frequency converter.
Numerical integration is carried out on the numerical values in the register to respectively obtain three-phase instantaneous voltage fundamental wave signals, and the calculation formula is as follows:
wherein V is a1 、V b1 And V c1 Three-phase instantaneous voltage fundamental wave signals of motors a, b and c respectively, V an 、V bn And V cn N three-phase PWM phase voltages (n=1, 2,3 … N) in the register, respectively.
In order to solve the technical problems, the application provides an alternating current motor driving control device, which comprises the reconstruction system of the instantaneous voltage fundamental wave signals, an alternating current power supply, a frequency converter, an observer and a control module, wherein the output end of the alternating current power supply is connected with the frequency converter, the reconstruction system of the instantaneous voltage fundamental wave signals is respectively connected with the frequency converter and the output end of the frequency converter, the observer is connected with the reconstruction system of the instantaneous voltage fundamental wave signals, and the control module is connected with the observer;
the frequency converter is used for outputting a desired driving voltage based on alternating current output by the alternating current power supply so as to drive the alternating current motor;
the observer is used for converting three-phase instantaneous voltage fundamental wave signals of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signals into the control module;
the control module is used for controlling each switching tube in the frequency converter based on the setting of a user and the three-phase instantaneous voltage fundamental wave signal so as to enable the frequency converter to output a desired driving voltage.
The control module controls each switching tube in the frequency converter based on the setting of a user and the three-phase instantaneous voltage fundamental wave signal so as to realize closed-loop control.
For an introduction of the ac motor driving control device provided by the present application, reference is made to the above embodiment, and the description of the present application is omitted herein.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A system for reconstructing a transient voltage fundamental signal, comprising:
the direct-current voltage detection module is connected with the frequency converter and is used for collecting direct-current voltage of the direct-current side of the frequency converter;
the motor voltage sampling module is connected with the output end of the frequency converter and the input end of the alternating current motor, and is connected with the direct current voltage detection module, and is used for collecting three-phase pulse voltage output by the frequency converter and generating high-low level three-phase digital pulse voltage signals based on the three-phase pulse voltage and the direct current voltage;
the processing module is connected with the direct-current voltage detection module and the motor voltage sampling module respectively, and is particularly used for sampling the three-phase digital pulse voltage signals based on the self clock frequency which is higher than the switching frequency of the frequency converter; performing phase voltage pulse conversion based on the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling to calculate N three-phase Pulse Width Modulation (PWM) phase voltages in each clock period, wherein N is the ratio of the self clock frequency to the switching frequency of the frequency converter; and carrying out digital integration processing on N PWM phase voltages in each clock period to determine three-phase instantaneous voltage fundamental wave signals of the alternating current motor in each clock period.
2. The system for reconstructing an instantaneous voltage fundamental signal according to claim 1, wherein the direct voltage detection module comprises:
the first voltage dividing module is connected with the frequency converter at a first end and used for reducing the voltage of the direct current side of the frequency converter to direct current voltage within a preset voltage range;
the input end of the analog-to-digital conversion module is connected with the second end of the first voltage division module and is used for converting the direct-current voltage in the preset voltage range into digital direct-current voltage;
the motor voltage sampling module is specifically used for collecting the three-phase pulse voltage output by the frequency converter and generating the three-phase digital pulse voltage signal based on the three-phase pulse voltage and the direct-current voltage in the preset voltage range;
the processing module is specifically configured to perform the phase voltage pulse conversion and the digital integration processing based on the digital direct current voltage and the three-phase digital pulse voltage signal, so as to determine the three-phase instantaneous voltage fundamental wave signal.
3. The system for reconstructing an instantaneous voltage fundamental signal according to claim 2, wherein the direct voltage detection module further comprises:
and the following amplifier is arranged between the first voltage dividing module and the analog-to-digital conversion module and is used for following the direct-current voltage in the preset voltage range output by the first voltage dividing module.
4. The system for reconstructing a fundamental instantaneous voltage signal according to claim 2, wherein the first voltage dividing module comprises a first voltage dividing resistor.
5. A system for reconstructing an instantaneous voltage fundamental signal according to claim 3, wherein the motor voltage sampling module comprises:
the second voltage dividing module is connected with the output end of the frequency converter and the input end of the alternating current motor and is used for reducing the three-phase pulse voltage output by the frequency converter into three-phase pulse voltage within the preset voltage range;
and the comparison module is respectively connected with the second voltage division module and the following amplifier and is used for respectively shaping the three-phase pulse voltage in the preset voltage range based on the direct current voltage in the preset voltage range so as to output the three-phase digital pulse voltage signal.
6. The system for reconstructing a fundamental instantaneous voltage signal according to claim 5, wherein the second voltage dividing module comprises a second voltage dividing resistor.
7. The system for reconstructing an instantaneous voltage fundamental signal according to claim 5, wherein the motor voltage sampling module further comprises:
and the isolation module is arranged between the comparison module and the processing module and is used for electrically isolating signals between the comparison module and the processing module and carrying out level conversion on the three-phase digital pulse voltage signals based on the power supply voltage of the processing module.
8. The system for reconstructing a transient voltage fundamental signal of claim 7, wherein said isolation module comprises:
the optical coupler is connected with the comparison module and is used for electrically isolating signals between the comparison module and the processing module;
and the level conversion module is arranged between the optocoupler and the processing module and is used for carrying out level conversion on the three-phase digital pulse voltage signal based on the power supply voltage of the processing module.
9. An ac motor drive control device, comprising the system for reconstructing an instantaneous voltage fundamental wave signal according to any one of claims 1 to 8, further comprising an ac power source, a frequency converter, an observer, and a control module, wherein an output end of the ac power source is connected to the frequency converter, the system for reconstructing an instantaneous voltage fundamental wave signal is respectively connected to the frequency converter and an output end of the frequency converter, the observer is connected to the system for reconstructing an instantaneous voltage fundamental wave signal, and the control module is connected to the observer;
the frequency converter is used for outputting expected driving voltage based on alternating current output by the alternating current power supply so as to drive the alternating current motor;
the observer is used for converting three-phase instantaneous voltage fundamental wave signals of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signals into the control module;
the control module is used for controlling each switching tube in the frequency converter based on the setting of a user and the three-phase instantaneous voltage fundamental wave signal so that the frequency converter outputs the expected driving voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111011833.4A CN113726256B (en) | 2021-08-31 | 2021-08-31 | Reconstruction system of instantaneous voltage fundamental wave signal and alternating current motor drive control device |
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