CN113726256A - Instantaneous voltage fundamental wave signal reconstruction system and alternating current motor drive control device - Google Patents
Instantaneous voltage fundamental wave signal reconstruction system and alternating current motor drive control device Download PDFInfo
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- CN113726256A CN113726256A CN202111011833.4A CN202111011833A CN113726256A CN 113726256 A CN113726256 A CN 113726256A CN 202111011833 A CN202111011833 A CN 202111011833A CN 113726256 A CN113726256 A CN 113726256A
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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 invention 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 at the direct current side of a frequency converter, the motor voltage sampling module can generate a three-phase digital pulse voltage signal according to the 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 integral processing on the basis of 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, so that a closed-loop control system can conveniently control the frequency converter, and the alternating current motor can operate according to the expectation of a user after being controlled.
Description
Technical Field
The invention 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 drive control device.
Background
In the prior art, when an ac motor is driven, frequency conversion is usually adopted for driving control, a specific control circuit is shown in fig. 1, and fig. 1 is a schematic diagram of a driving apparatus of an ac motor in the prior art, wherein a frequency converter is disposed between an ac power supply and the ac motor, and a motor driving control system controls an operation state of each switching tube in the frequency converter, so that the frequency converter outputs a desired driving voltage to drive the ac motor. The ac motor is operated according to the expectation of the user only if the instantaneous voltage fundamental wave signal satisfies the expectation, and therefore, the motor drive control system is generally provided with a control module which performs closed-loop control of the switching tube of the inverter 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 thus, the instantaneous voltage fundamental wave signal is an important input of an observer in the motor drive control system, which converts the instantaneous voltage fundamental wave signal of the ac motor and inputs the converted signal into the control module, so that the control module controls the switching tube in the inverter. However, the actual instantaneous voltage of the ac motor is a time-continuous PWM (Pulse width modulation) Pulse sequence output by an inverter circuit in the frequency converter, which includes an instantaneous voltage fundamental wave signal and each subharmonic, please refer to fig. 2, and fig. 2 is a schematic diagram of a PWM Pulse sequence and an 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 by a sensor, and only can be indirectly extracted or reconstructed.
Disclosure of Invention
The invention 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 three-phase pulse voltage and direct current voltage of an alternating current motor, and a processing module carries out phase voltage pulse conversion and digital integral processing on the basis of 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, so that a closed-loop control system can conveniently control a frequency converter, and the alternating current motor can be operated according to the expectation of a user after being controlled.
In order to solve the above technical problem, the present invention provides a system for reconstructing an instantaneous voltage fundamental signal, including:
the direct-current voltage detection module is connected with the frequency converter and is used for collecting direct-current voltage at 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, 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 on the basis of 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 dc voltage detection module includes:
the first voltage division module is connected with the frequency converter at a first end and is used for reducing the voltage on the direct current side of the frequency converter into 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 direct-current voltage of digital quantity;
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 within 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 to determine the three-phase instantaneous voltage fundamental wave signal.
Preferably, the dc voltage detection module further includes:
and the following amplifier is arranged between the first voltage division module and the analog-to-digital conversion module and is used for following the direct-current voltage within the preset voltage range output by the first voltage division module.
Preferably, the first voltage dividing module comprises a first voltage dividing resistor.
Preferably, the motor voltage sampling module includes:
the second voltage division 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 modules are respectively connected with the second voltage division module and the follower amplifier and are used for respectively carrying out shaping processing on the three-phase pulse voltage within the preset voltage range based on the direct-current voltage within the preset voltage range so as to output the three-phase digital pulse voltage signal.
Preferably, the second voltage division module includes a second voltage division resistor.
Preferably, the motor voltage sampling module further comprises:
and the isolation module is arranged between the comparison module and the processing module and 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 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 optical coupler and the processing module and 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, and the self-clock frequency is higher than a switching frequency of the frequency converter; performing phase voltage pulse conversion on the basis of the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling so as to calculate N three-phase Pulse Width Modulation (PWM) phase voltages in each clock cycle, wherein N is the ratio of the self clock frequency to the switching frequency of the frequency converter; and performing 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 problem, the present invention provides an ac motor drive control apparatus, including the above-mentioned instantaneous voltage fundamental wave signal reconstruction system, further including an ac power supply, a frequency converter, an observer, and a control module, where an output end of the ac power supply is connected to the frequency converter, the instantaneous voltage fundamental wave signal reconstruction system is connected to the frequency converter and an output end of the frequency converter, the observer is connected to the instantaneous voltage fundamental wave signal reconstruction system, and the control module is connected to the observer;
the frequency converter is used for outputting expected driving voltage based on the alternating current output by the alternating current power supply so as to drive the alternating current motor;
the observer is used for converting a three-phase instantaneous voltage fundamental wave signal of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signal 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 the expected driving voltage.
The application provides a reconfiguration system and AC motor drive control device of instantaneous voltage fundamental wave signal, including direct current voltage detection module, motor voltage sampling module and processing module, wherein, direct current voltage detection module can gather the direct current voltage of converter direct current side, motor voltage sampling module can generate three-phase digital pulse voltage signal according to AC motor's three-phase pulse voltage and direct current voltage, processing module carries out looks voltage pulse conversion and digital integral processing based on direct current voltage and three-phase digital pulse voltage signal, with reconfiguration AC motor's three-phase instantaneous voltage fundamental wave signal, thereby be convenient for closed-loop control system controls the converter, thereby make and control the back to AC motor, make AC motor operate according to user's expectation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art AC motor drive;
FIG. 2 is a schematic diagram of a PWM pulse sequence and an instantaneous voltage fundamental signal output by an inverter circuit in the prior art;
FIG. 3 is a schematic structural diagram of a system for reconstructing an instantaneous voltage fundamental signal according to the present invention;
FIG. 4 is a schematic diagram of a prior art system for reconstructing an instantaneous voltage fundamental signal;
FIG. 5 is a schematic diagram of another prior art transient voltage fundamental signal reconstruction system;
fig. 6 is a schematic structural diagram of a system for reconstructing an instantaneous voltage fundamental wave signal according to the present invention.
Detailed Description
The core of the invention is to provide a reconstruction system of an instantaneous voltage fundamental wave signal and an alternating current motor driving control device, a motor voltage sampling module can generate a three-phase digital pulse voltage signal according to three-phase pulse voltage and direct current voltage of an alternating current motor, and a processing module carries out phase voltage pulse conversion and digital integral processing based on the direct current voltage and the three-phase digital pulse voltage signal to reconstruct the three-phase instantaneous voltage fundamental wave signal of the alternating current motor, so that a closed-loop control system can control a frequency converter conveniently, and the alternating current motor can operate according to the expectation of a user after being controlled.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a system for reconstructing an instantaneous voltage fundamental wave signal according to the present invention, the system includes:
the direct-current voltage detection module 1 is connected with the frequency converter and is used for collecting direct-current voltage at 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, 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 performing phase voltage pulse conversion and digital integration processing on the basis of direct-current voltage and 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 adopted to drive and control an alternating current motor, and in order to ensure that the alternating current motor operates according to expected conditions, closed-loop control is generally adopted for the alternating current motor, that is, the voltage input to the alternating current motor is adjusted according to expected voltage and actual voltage of a coil of the alternating current motor, so that the actual voltage of the coil of the alternating current motor is the expected voltage. However, 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 time-continuous PWM pulse sequences, which include instantaneous voltage fundamental wave signals and harmonic voltages, and only the instantaneous voltage fundamental wave signals are important parameters for closed-loop control in the drive control of the ac motor, which directly affect the control and operation performance of the ac motor.
In the prior art, when extracting an instantaneous voltage fundamental wave signal, a first scheme is to directly use a reference voltage output by a control module in a motor drive control system, please refer to fig. 4, fig. 4 is a schematic structural diagram of a system for reconstructing an instantaneous voltage fundamental wave signal in the prior art, the voltage of a coil of an alternating current motor does not need to be collected and measured, theoretically, the instantaneous voltage fundamental wave signal of the coil of the alternating current motor is consistent with the reference voltage output by the control module, but because of the influence of voltage drop and bridge arm dead time when a switching device of an inverter circuit in a frequency converter is turned on, a certain difference exists between the reference voltage and an actual instantaneous voltage fundamental wave signal of the coil of the alternating current motor, at this time, the inverter circuit nonlinear algorithm is usually adopted for compensation, but the compensation method is greatly influenced by characteristic parameters, temperature drift, current zero crossing point detection precision and the like of the switching device in the inverter circuit, particularly, under the conditions of low speed and light load of the alternating current motor, the zero crossing point detection precision of the current signal 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 instantaneous voltage fundamental wave signal reconstruction system in the prior art, a second scheme in the prior art is to use an analog sampling circuit to directly acquire and measure the voltage of a coil of an ac motor, and use a hardware low-pass filter circuit to extract an instantaneous voltage fundamental wave signal component therein, but the hardware low-pass filter circuit has the defects of amplitude attenuation, phase delay, fixed cutoff frequency, and the like, and particularly under the variable-frequency speed regulation condition of the ac motor, the implementation process of amplitude and phase compensation is very complicated, which affects the real-time performance and accuracy of the instantaneous voltage fundamental wave signal.
In order to solve the technical problem, the direct current voltage detection module 1 and the motor voltage sampling module 2 are respectively arranged in the device, wherein the direct current voltage detection module 1 can collect direct current voltage on the direct current side of the frequency converter, and the motor voltage sampling module 2 can generate a three-phase digital pulse voltage signal 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 integral processing to reconstruct a three-phase instantaneous voltage fundamental wave signal of the alternating current motor. The application can not influence the motor drive control system by the low-pass filter circuit, and can not influence the normal drive of the alternating current motor due to the self limitation of the hardware low-pass filter circuit.
In summary, the motor voltage sampling module 2 in the present application can generate a three-phase digital pulse voltage signal according to a three-phase pulse voltage and a direct current voltage of the ac 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 signal to reconstruct a three-phase instantaneous voltage fundamental wave signal of the ac motor, so that the closed-loop control system can control the frequency converter, and the ac motor can be operated according to a user's desire after being controlled.
On the basis of the above-described embodiment:
referring to fig. 6, fig. 6 is a schematic structural diagram of a system for reconstructing an instantaneous voltage fundamental wave signal according to the present invention.
As a preferred embodiment, the dc voltage detection module 1 includes:
the first voltage division module is connected with the frequency converter at a first end and is used for reducing the voltage on the direct current side of the frequency converter into direct current voltage within a preset voltage range;
the analog-to-digital conversion module is connected with the second end of the first voltage division module at the input end and is used for converting the direct-current voltage within the preset voltage range into the direct-current voltage of digital quantity;
the motor voltage sampling module 2 is specifically 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 direct current voltage within 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 direct-current voltage and the three-phase digital pulse voltage signal to determine a three-phase instantaneous voltage fundamental wave signal.
In the dc detection module in this embodiment, when acquiring the dc voltage at the dc side of the frequency converter, the first voltage division module is connected to the dc side of the frequency converter, and the voltage at the dc side of the frequency converter is reduced to a dc voltage within a preset voltage range (e.g., 0-15V), so as to avoid the influence of a large voltage at the dc side of the frequency converter on a rear-end device; the analog-to-digital conversion module converts the direct-current voltage after the voltage reduction of the first voltage division module into the direct-current voltage of the digital quantity, so that the processing module 3 can process the direct-current voltage of the digital quantity conveniently.
As a preferred embodiment, the dc voltage detection module 1 further includes:
and the following amplifier is arranged between the first voltage division module and the analog-to-digital conversion module and is used for following the direct-current voltage within the preset voltage range output by the first voltage division module.
In order to avoid voltage loss in the circuit, a follower amplifier is further arranged in this embodiment, so that it is ensured that the voltage input to the analog-to-digital conversion module is a direct current voltage within a 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 includes a first voltage dividing resistor.
The first voltage dividing module in this embodiment may be, but is not limited to, formed by a first voltage dividing resistor, and a plurality of first voltage dividing resistors may be provided to step down the voltage on the dc side of the frequency converter to a dc voltage within a preset voltage range, which is not limited in this application.
In addition, the divider resistor also has the characteristics of low cost and convenient arrangement.
As a preferred embodiment, the motor voltage sampling module 2 includes:
the second voltage division 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 follower amplifier, and is configured to respectively perform shaping processing on the three-phase pulse voltage within the preset voltage range based on the direct-current voltage within the preset voltage range, so as to output a three-phase digital pulse voltage signal.
In this embodiment, the second voltage dividing module 21 reduces the three-phase pulse voltage output by the frequency converter to a three-phase pulse voltage within a preset voltage range (for example, 0 to 15V), so as to avoid a fault after the comparison module 22 inputs a large voltage; in the comparison in the present application, the module 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 comparing module 22 outputs a high level and outputs a low level when the three-phase pulse voltage is not greater than the dc voltage, 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 includes a second voltage dividing resistor.
The second voltage dividing module 21 in this embodiment may be, but is not limited to, formed by a second voltage dividing resistor, and a plurality of second voltage dividing resistors may be provided to step down the voltage on the dc side of the frequency converter to a dc voltage within a preset voltage range, which is not limited in this application.
As a preferred embodiment, the motor voltage sampling module 2 further includes:
and the isolation module 23 is arranged between the comparison module 22 and the processing module 3, and is used for electrically isolating signals between the comparison module 22 and the processing module 3 and performing level conversion on the three-phase digital pulse voltage signals based on the power supply voltage of the processing module 3.
As a preferred embodiment, the isolation module 23 includes:
the optical coupler is connected with the comparison module 22 and is used for electrically isolating signals between the comparison module 22 and the processing module 3;
and the level conversion module is arranged between the optical coupler 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 can perform level conversion on 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 a self-clock frequency, where the self-clock frequency is higher than a switching frequency of the frequency converter; performing phase voltage pulse conversion on the basis of the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling so as 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 converter to the switching frequency of the frequency converter; and performing digital integration processing on the N PWM phase voltages in each clock period to determine a three-phase instantaneous voltage fundamental wave signal of the alternating current motor in each clock period.
The processing module 3 in this embodiment may be, but is not limited to, an FPGA (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 0V or 3.3V digital pulse signal, and then sends the digital pulse signal to the FPGA digital chip in the FPGA digital chip, and the FPGA digital chip samples the three-phase digital pulse voltage signal and the dc voltage at the dc side of the frequency converter at the rising edge or the falling edge of each clock cycle; and based on the three-phase PWM phase voltage of the motor, calculating the three-phase PWM phase voltage of the motor by the following formula:
wherein, Va、VbAnd VcThree-phase PWM phase voltage V of motors a, b and cdcIs the DC voltage, S, of the DC side of the frequency convertera、SbAnd ScThe three-phase digital pulse voltage signals of the motors a, b and c are respectively, and the numerical value of the three-phase digital pulse voltage signals is 0 or 1.
And respectively storing the calculated N three-phase PWM phase voltages into three registers with the depth of N in the FPGA digital chip. The data in the register is updated once every clock cycle, and the calculation formula of N is as follows:
wherein f iscFor the clock frequency of the FPGA digital chip itself, f in generalcCan take values of 1MHz-10MHz, fsN is typically an integer, which is the switching frequency of the frequency converter.
Performing digital integration on the numerical values in the register to respectively obtain three-phase instantaneous voltage fundamental wave signals, wherein the calculation formula is as follows:
wherein, Va1、Vb1And Vc1Three-phase instantaneous voltage fundamental wave signals V of motors a, b and can、VbnAnd VcnN three-phase PWM phase voltages (N is 1, 2, 3 … N) in the register are provided.
In order to solve the technical problem, the invention provides an alternating current motor driving control device, which comprises the instantaneous voltage fundamental wave signal reconstruction system, 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 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 a three-phase instantaneous voltage fundamental wave signal of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signal 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 the description of the ac motor driving control apparatus provided by the present invention, please refer to the above embodiments, and the present invention is not repeated herein.
It is further noted that, in the present 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A system for reconstructing an instantaneous voltage fundamental signal, comprising:
the direct-current voltage detection module is connected with the frequency converter and is used for collecting direct-current voltage at 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, 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 on the basis of 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.
2. The system for reconstructing an instantaneous voltage fundamental signal according to claim 1, wherein the dc voltage detection module includes:
the first voltage division module is connected with the frequency converter at a first end and is used for reducing the voltage on the direct current side of the frequency converter into 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 direct-current voltage of digital quantity;
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 within 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 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 dc voltage detection module further comprises:
and the following amplifier is arranged between the first voltage division module and the analog-to-digital conversion module and is used for following the direct-current voltage within the preset voltage range output by the first voltage division module.
4. The system for reconstructing an instantaneous voltage fundamental signal according to claim 2, wherein said first voltage division module includes a first voltage division resistor.
5. The system for reconstructing an instantaneous voltage fundamental signal of claim 3, wherein the motor voltage sampling module comprises:
the second voltage division 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 modules are respectively connected with the second voltage division module and the follower amplifier and are used for respectively carrying out shaping processing on the three-phase pulse voltage within the preset voltage range based on the direct-current voltage within the preset voltage range so as to output the three-phase digital pulse voltage signal.
6. The system for reconstructing an instantaneous voltage fundamental signal according to claim 5, wherein said second voltage division module includes a second voltage division resistor.
7. The system for reconstructing an instantaneous voltage fundamental signal of 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 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 an instantaneous voltage fundamental signal of claim 7, wherein the 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 optical coupler and the processing module and 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. The system for reconstructing an instantaneous voltage fundamental signal according to claim 1, characterized in that the processing module is specifically configured to sample the three-phase digital pulse voltage signal based on a self-clock frequency, and the self-clock frequency is higher than a switching frequency of the frequency converter; performing phase voltage pulse conversion on the basis of the direct-current voltage and each three-phase digital pulse voltage signal obtained by sampling so as to calculate N three-phase Pulse Width Modulation (PWM) phase voltages in each clock cycle, wherein N is the ratio of the self clock frequency to the switching frequency of the frequency converter; and performing 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.
10. An ac motor drive control apparatus comprising the system for reconstructing an instantaneous-voltage fundamental wave signal according to any one of claims 1 to 9, further comprising an ac power supply, an inverter, an observer, and a control module, an output of the ac power supply being connected to the inverter, the system for reconstructing an instantaneous-voltage fundamental wave signal being connected to the inverter and an output of the inverter, respectively, the observer being connected to the system for reconstructing an instantaneous-voltage fundamental wave signal, and the control module being connected to the observer;
the frequency converter is used for outputting expected driving voltage based on the alternating current output by the alternating current power supply so as to drive the alternating current motor;
the observer is used for converting a three-phase instantaneous voltage fundamental wave signal of the alternating current motor and inputting the three-phase instantaneous voltage fundamental wave signal 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 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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