CN108462425B - Variable frequency speed regulation control method and system of single-phase motor - Google Patents
Variable frequency speed regulation control method and system of single-phase motor Download PDFInfo
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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
- H02P27/06—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 using dc to ac converters or inverters
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/04—Single phase motors, e.g. capacitor motors
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Abstract
A frequency conversion speed regulation control method of a single-phase motor is characterized in that M-axis deviation voltage and T-axis deviation voltage of a frequency converter are calculated; for M-axis offset voltage andthe T-axis deviation voltage is subjected to inverse PARK conversion to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut(ii) a Calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2(ii) a Will voltage angle V1Angle V with voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3(ii) a According to the voltage space vector corresponding to the on-off state of the inverter unit of the frequency converter and the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle; calculating a given voltage vector; and determining the action sequence of the basic space vectors according to an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter unit so as to drive the single-phase motor to operate. In addition, a variable frequency speed regulation control system of the single-phase motor is also provided.
Description
Technical Field
The invention relates to a frequency converter, in particular to a frequency conversion speed regulation control method and a frequency conversion speed regulation control system of a single-phase motor with wide speed regulation range and high precision.
Background
The single-phase asynchronous motor is simple in structure, low in price, firm, durable and convenient to maintain, and is widely applied to application occasions of household appliances and low-power industrial equipment, such as air compressors, air conditioners, refrigerators, washing machines, water pumps and the like. The current speed regulation method of the single-phase motor mainly comprises the following steps:
the first scheme is as follows: the reactor speed regulation is characterized in that a variable reactor with a plurality of taps is connected in series at the input power supply side of the single-phase motor, and the input voltage of the single-phase motor is changed through the voltage division effect of the reactor on the input power supply, so that the purpose of voltage transformation speed regulation is realized.
Scheme II: the tap speed regulation is realized by placing a main winding, an auxiliary winding and a speed regulation winding in a stator slot of a single-phase motor and changing the connection mode of the speed regulation winding and the main winding and the auxiliary winding.
The third scheme is as follows: the method can realize the purpose of continuous speed regulation without changing the capacitance in the single-phase motor and winding a wiring mode.
The existing motor has limited control speed regulation range, small motor output torque and poor speed stabilization precision during low voltage, and is only suitable for light-load speed regulation occasions. Or only can realize step speed regulation and can not carry out continuous speed regulation, and is limited by the structure of the motor. Or the single-phase motor with the centrifugal switch is not suitable, because only two-phase output of the frequency converter is used, the power consumption of the six bridge circuits inverted by the frequency converter is unbalanced, 4 bridge arms are easily damaged, the output current is large, and the capacity of the frequency converter is larger than the power of the single-phase motor.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for controlling the variable frequency speed regulation of a single-phase motor with a wide speed regulation range and high precision.
A frequency conversion speed regulation control method of a single-phase motor comprises the following steps:
calculating M-axis deviation voltage and T-axis deviation voltage of the frequency converter;
performing inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut；
Calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2；
The voltage angle V is measured1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3；
According to the voltage space vector corresponding to the on-off state of the inverter unit of the frequency converter and the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle;
calculating a given voltage vector according to the basic space vector and the zero vector;
and determining the action sequence of the basic space vectors according to an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter unit so as to drive the single-phase motor to operate.
In one embodiment, the step of calculating the M-axis offset voltage of the frequency converter includes:
and performing PI regulation on a deviation signal between the given value of the exciting current and the feedback value of the exciting current to obtain M-axis deviation voltage.
In one embodiment, the method further comprises the following steps:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the principle of a single-phase motor, an exciting current feedback value and an exciting current given value are obtained.
In one embodiment, the step of calculating the T-axis offset voltage of the frequency converter includes:
and performing PI regulation on a deviation signal between the torque current set value and the torque current feedback value to obtain T-axis deviation voltage.
In one embodiment, the method further comprises the following steps:
acquiring the set frequency of a single-phase motor, and performing acceleration and deceleration time processing on the set frequency to obtain the set frequency at the current moment;
and acquiring a deviation signal between the frequency WmId and the given frequency at the current moment according to a speed identification method, and performing PI regulation on the deviation signal to acquire a given value of the torque current.
In one embodiment, the method further comprises the following steps:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the single-phase motor principle, a torque current feedback value is obtained.
A frequency conversion speed regulation control system of a single-phase motor comprises a rectification module, an inversion module, a main control module and a driving module;
the rectification module is used for rectifying the input power supply and outputting the processed power supply to the main control module and the inversion module; the main control module is used for calculating M-axis deviation voltage and T-axis deviation voltage of the frequency converter;
the main control module is also used for carrying out inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut；
The main control module is also used for calculating the voltage angle V of the MT shaft and the two-phase static coordinate according to the magnetic flux identification2；
The main control module is also used for converting the voltage angle V1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3；
The inversion unit is used for converting the voltage space vector corresponding to the on-off state of the inversion unit of the frequency converter into the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle;
the main control module is also used for calculating a given voltage vector according to the basic space vector and the zero vector;
the driving module is used for determining the action sequence of the basic space vectors according to an SVPWM method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inversion module, so that the inversion module controls and drives the single-phase motor to operate.
In one embodiment, the device further comprises a current detection module, wherein the current detection module is used for detecting W-phase and U-phase currents in three-phase output of the single-phase motor; sending the W-phase current and the U-phase current to the main control module; the main control module is used for obtaining an exciting current feedback value and an exciting current given value according to the principle of a single-phase motor.
In one embodiment, the main control module is further configured to obtain a set frequency of the single-phase motor, and perform processing of acceleration and deceleration time on the set frequency to obtain a current given frequency;
the main control module is also used for acquiring a deviation signal between the frequency WmId and the given frequency at the current moment according to a speed identification method, and performing PI regulation on the deviation signal to acquire a given value of the torque current.
In one embodiment, the main control module is further configured to perform PI adjustment on a deviation signal between an excitation current given value and an excitation current feedback value to obtain an M-axis deviation voltage; and
and the main control module is also used for carrying out PI regulation on a deviation signal between the torque current given value and the torque current feedback value to obtain T-axis deviation voltage.
The frequency conversion speed regulation control method and the system of the single-phase motor calculate the M-axis deviation voltage and the T-axis deviation voltage of the frequency converter; carrying out inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut(ii) a Calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2(ii) a The voltage angle V is measured1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3(ii) a According to the voltage space vector corresponding to the on-off state of the inverter unit of the frequency converter and the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle; calculating a given voltage vector according to the basic space vector and the zero vector; and determining the action sequence of the basic space vectors according to an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter unit so as to drive the single-phase motor to operate. The method and the system control the single-phase motor by means of coordinate transformation and magnetic field directional decoupling current, and control the speed of the single-phase motor by utilizing the SVPWM modulation technology, so that the speed regulation range of the single-phase motor is wide and the precision is higher.
Drawings
FIG. 1 is a flow chart of a variable frequency speed control method of a single-phase single machine;
fig. 2 is a block diagram of a variable-frequency speed-regulating control system of a single-phase single machine.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, it is a flow chart of the method for controlling the variable frequency speed control of a single-phase single machine.
A frequency conversion speed regulation control method of a single-phase motor comprises the following steps:
step S110, calculating M-axis deviation voltage and T-axis deviation voltage of the frequency converter.
In this embodiment, the step of calculating the M-axis offset voltage of the frequency converter includes:
and performing PI regulation on a deviation signal between the given value of the exciting current and the feedback value of the exciting current to obtain M-axis deviation voltage.
Therefore, the given value of the exciting current and the feedback value of the exciting current need to be calculated before calculating the M-axis deviation voltage.
Therefore, the frequency conversion speed regulation control method of the single-phase motor further comprises the following steps:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the principle of a single-phase motor, an exciting current feedback value and an exciting current given value are obtained.
In this embodiment, the step of calculating the T-axis offset voltage of the frequency converter includes:
and performing PI regulation on a deviation signal between the torque current set value and the torque current feedback value to obtain T-axis deviation voltage.
Therefore, the torque current set value and the torque current feedback value need to be calculated before the T-axis deviation voltage is calculated.
Therefore, the frequency conversion speed regulation control method of the single-phase motor further comprises the following steps:
acquiring the set frequency of a single-phase motor, and performing acceleration and deceleration time processing on the set frequency to obtain the set frequency at the current moment;
and acquiring a deviation signal between the frequency WmId and the given frequency at the current moment according to a speed identification method, and performing PI regulation on the deviation signal to acquire a given value of the torque current.
Therefore, the frequency conversion speed regulation control method of the single-phase motor further comprises the following steps:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the single-phase motor principle, a torque current feedback value is obtained.
Step S112, inverse PARK conversion is carried out on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut。
Step S114, calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2。
Step S116, converting the voltage angle V1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3。
Step S118, according to the voltage space vector corresponding to the on-off state of the inverter unit of the frequency converter and the voltage vector angle V3And calculating the adjacent basic space vector and the zero vector of the sector under the angle.
And step S120, calculating a given voltage vector according to the basic space vector and the zero vector.
And S122, determining the action sequence of the basic space vectors according to an SVPWM method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter unit so as to drive the single-phase motor to operate.
Based on the above embodiment, the working process of the variable frequency speed control method of the single-phase motor is as follows:
the method takes tracking of a circular magnetic field as a target, decomposes a current vector into an excitation current and a torque current which are perpendicular to each other in a magnetic field orientation coordinate, independently controls and respectively regulates the excitation current and the torque current, controls the output voltage of an inverter unit by utilizing an SVPWM (space vector pulse width modulation) technology, and achieves the aim of speed regulation of a single-phase motor, and specifically comprises the following main implementation steps:
during high-speed interruption, W, U phase currents in the three-phase output of the single-phase motor are detected by means of a current detection circuit.
According to the single-phase motor principle, the current flowing through the main winding is spatially 90 ° different from the current flowing through the auxiliary winding. The current flowing through the main winding is torque current, and the current flowing through the auxiliary winding is exciting current.
And obtaining a deviation voltage through a PI regulator according to a deviation signal between the given value of the exciting current and the feedback value of the exciting current.
The set frequency of the motor is obtained through a keyboard or external analog quantity, and the set frequency at the current moment is obtained through acceleration and deceleration time processing.
And obtaining a given value of the torque current through a PI regulator according to a deviation signal between the frequency WmId identified by the speed identification method and the given frequency.
Obtaining an offset voltage UtOut through a PI regulator according to an offset signal between a torque current given value and a torque current feedback value;
obtaining a voltage angle V under a two-phase static coordinate by performing inverse PARK conversion on the obtained M-axis voltage UmOut and the obtained T-axis voltage UtOut1While calculating the voltage vector magnitude VOut；
Calculating the voltage angle V between the MT axis and the two-phase stationary coordinate by magnetic flux identification2And at an angle V to the voltage1Superposing the voltage vector angle V to calculate the voltage vector angle V3。
8 basic voltage space vectors and voltage vector angles V respectively corresponding to 8 switch states of two-phase six-bridge-arm inverter unit3And calculating the adjacent basic space vector and zero vector of the sector under the angle, wherein the average value of the combination of the basic voltage vector and the zero vector is equal to the given voltage vector.
And determining the action sequence of the basic voltage vectors by adopting an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, outputting PWM (pulse width modulation) waves to control the time-sharing action of the 6 bridge arms in the inversion unit, and driving the single-phase motor to operate.
Generally, a single-phase motor mostly adopts a capacitor connected in series in a secondary winding to change a phase difference between currents flowing through the secondary winding and a main winding, so that a rotor obtains a certain starting torque to enable the single-phase motor to rotate. The phase difference angle between the main winding and the auxiliary winding is changed by manually switching a switch or changing a wiring mode to switch the forward rotation and the reverse rotation. When the phase difference of the current of the main winding and the current of the auxiliary winding is 90 degrees, the single-phase motor can obtain a relatively ideal circular rotating magnetic field, so that a larger starting torque is output, and better running performance is obtained. Therefore, the method provides that a voltage Space Vector Pulse Width Modulation (SVPWM) technology is utilized, based on the speed regulation principle of the single-phase motor, the magnetic field directional decomposition control is carried out by means of coordinate transformation, and an output PWM wave controls a two-phase six-bridge arm inverter unit to output three-phase alternating current so as to control the rotation of the single-phase motor. Before the single-phase motor is driven by the method, the capacitor and the selector switch of the single-phase motor are removed, the main winding is connected to the W phase of the inversion unit, the auxiliary winding is connected to the U phase of the inversion unit, and the common end is connected to the V phase of the inversion unit.
Fig. 2 is a block diagram of a variable frequency speed control system of a single-phase motor.
A frequency conversion speed regulation control system of a single-phase motor comprises a rectification module, an inversion module 102, a main control module and a driving module 104;
the rectification module is used for rectifying the input power supply and outputting the processed power supply to the main control module 103 and the inversion module 102; the main control module 103 is used for calculating an M-axis deviation voltage and a T-axis deviation voltage of the frequency converter;
the main control module 103 is further configured to perform inverse PARK transformation on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under the two-phase stationary coordinate1And calculating the voltage vector magnitude VOut；
The main control module 103 is further configured to calculate a voltage angle V between the MT axis and the two-phase stationary coordinate according to the magnetic flux identification2；
The main control module 103 is further used for converting the voltage angle V1Angle V with voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3；
The inversion unit is used for generating a voltage space vector and a voltage vector angle V corresponding to the switching state of the inversion unit of the frequency converter3Calculating the adjacent basic space vector and zero vector of the sector under the angle;
the main control module 103 is further configured to calculate a given voltage vector according to the basic space vector and the zero vector;
the driving module 104 is configured to determine an action sequence of the basic space vectors according to an SVPWM method, calculate an action time of each basic space vector, and further output a pulse modulation signal to control a bridge arm time-sharing action in the inverter module 102, so that the inverter module 102 controls and drives the single-phase motor to operate.
In this embodiment, the rectifying module rectifies the input 220v single-phase ac power into dc power, and provides power to the inverter unit and the main control module 103 after filtering.
The inversion module 102 is composed of a two-phase six-bridge arm inversion module 102, is controlled by the main control module 103, and controls six power switching tubes in the inversion unit to act in a time-sharing manner through the driving module 104, so that direct current is converted into alternating current with adjustable frequency and amplitude, and the motor is driven to rotate.
The fault protection module monitors the periphery of the system, when an abnormal fault occurs, a hardware signal with the abnormal fault is sent to the main control module 103, and the main control module 103 correspondingly processes different fault signals to protect the system, wherein the fault protection module comprises overcurrent protection, overvoltage protection, undervoltage protection, overtemperature protection and the like.
And the peripheral input and output module is used for providing peripheral input and output signals for assisting the system, wherein the peripheral input and output signals comprise analog quantity input/output, switching value input/output, relay output and the like.
The keyboard and the display module provide a human-computer interface for the system, and system parameter setting and system parameter monitoring are facilitated.
The main control module 103 is used for fault processing, external input, output data processing, current/voltage sampling, magnetic field orientation decomposition and control, SVPWM calculation, and the like.
The variable frequency speed control system of the single-phase motor further comprises a voltage detection module 105, and the voltage detection module 105 is used for detecting the voltage output by the rectification module and feeding the voltage back to the main control module 103.
The variable-frequency speed regulation control system of the single-phase motor further comprises a current detection module 106, wherein the current detection module 106 is used for detecting W-phase and U-phase currents in three-phase output of the single-phase motor; and sends the W-phase and U-phase currents to the main control module 103; the main control module 103 is configured to obtain an excitation current feedback value and an excitation current given value according to a single-phase motor principle.
The main control module 103 is further configured to obtain a set frequency of the single-phase motor, and perform processing of acceleration and deceleration time on the set frequency to obtain a current given frequency;
the main control module 103 is further configured to obtain a deviation signal between the frequency WmId and the current given frequency according to a speed identification method, and perform PI adjustment on the deviation signal to obtain a given torque current value.
The main control module 103 is further configured to perform PI adjustment on a deviation signal between the excitation current given value and the excitation current feedback value to obtain an M-axis deviation voltage; and
the main control module 103 is further configured to perform PI adjustment on a deviation signal between the torque current given value and the torque current feedback value to obtain a T-axis deviation voltage.
The frequency conversion speed regulation control method and the system of the single-phase motor calculate the M-axis deviation voltage and the T-axis deviation voltage of the frequency converter; carrying out inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut(ii) a Calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2(ii) a The voltage angle V is measured1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3(ii) a According to the voltage space vector corresponding to the on-off state of the inverter unit of the frequency converter and the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle; calculating a given voltage vector according to the basic space vector and the zero vector; and determining the action sequence of the basic space vectors according to an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter unit so as to drive the single-phase motor to operate. The method and the system control the single-phase motor by coordinate transformation and magnetic field directional decoupling currentAnd the speed of the single-phase motor is controlled by utilizing the SVPWM modulation technology, so that the speed regulation range of the single-phase motor is wide and the precision is higher.
The method and the system have small starting current, can carry out frequent starting control, and have flexible switching between rotation and reversal and arbitrarily set acceleration and deceleration time; high power factor and good energy-saving effect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A frequency conversion speed regulation control method of a single-phase motor comprises the following steps:
performing PI adjustment on a deviation signal between an exciting current given value and an exciting current feedback value to obtain M-axis deviation voltage of the frequency converter, and performing PI adjustment on a deviation signal between a torque current given value and a torque current feedback value to obtain T-axis deviation voltage;
performing inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut；
Calculating the voltage angle V between the MT axis and the two-phase static coordinate according to the magnetic flux identification2；
The voltage angle V is measured1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3；
According to the voltage space vector corresponding to the on-off state of the inverter module of the frequency converter and the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle;
calculating a given voltage vector according to the basic space vector and the zero vector;
and determining the action sequence of the basic space vectors according to an SVPWM (space vector pulse width modulation) method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inverter module so as to drive the single-phase motor to operate.
2. The variable frequency speed control method of the single-phase motor according to claim 1, further comprising:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the principle of a single-phase motor, an exciting current feedback value and an exciting current given value are obtained.
3. The variable frequency speed control method of the single-phase motor according to claim 1, further comprising:
acquiring the set frequency of a single-phase motor, and performing acceleration and deceleration time processing on the set frequency to obtain the set frequency at the current moment;
and acquiring a deviation signal between the frequency WmId and the given frequency at the current moment according to a speed identification method, and performing PI regulation on the deviation signal to acquire a given value of the torque current.
4. The variable frequency speed control method of the single-phase motor according to claim 1, further comprising:
detecting W-phase and U-phase currents in three-phase output of the single-phase motor;
according to the single-phase motor principle, a torque current feedback value is obtained.
5. A frequency conversion speed regulation control system of a single-phase motor comprises a rectification module and an inversion module, and is characterized by also comprising a main control module and a driving module;
the rectification module is used for rectifying the input power supply and outputting the processed power supply to the main control module and the inversion module; the main control module is used for carrying out PI regulation according to a deviation signal between an exciting current given value and an exciting current feedback value to obtain M-axis deviation voltage of the frequency converter and carrying out PI regulation according to a deviation signal between a torque current given value and a torque current feedback value to obtain T-axis deviation voltage;
the main control module is also used for carrying out inverse PARK conversion on the M-axis deviation voltage and the T-axis deviation voltage to obtain a voltage angle V under a two-phase static coordinate1And calculating the voltage vector magnitude VOut；
The main control module is also used for calculating the voltage angle V of the MT shaft and the two-phase static coordinate according to the magnetic flux identification2；
The main control module is also used for converting the voltage angle V1At an angle V to said voltage2Superposing the voltage vector angle V to calculate the voltage vector angle V3；
The inversion module is used for converting the voltage space vector corresponding to the on-off state of the inversion module of the frequency converter into the voltage vector angle V3Calculating the adjacent basic space vector and zero vector of the sector under the angle;
the main control module is also used for calculating a given voltage vector according to the basic space vector and the zero vector;
the driving module is used for determining the action sequence of the basic space vectors according to an SVPWM method, calculating the action time of each basic space vector, and further outputting a pulse modulation signal to control the time-sharing action of a bridge arm in the inversion module, so that the inversion module controls and drives the single-phase motor to operate.
6. The variable-frequency speed-regulating control system of the single-phase motor according to claim 5, further comprising a current detection module, wherein the current detection module is used for detecting W-phase and U-phase currents in three-phase output of the single-phase motor; sending the W-phase current and the U-phase current to the main control module; the main control module is used for obtaining an exciting current feedback value and an exciting current given value according to the principle of a single-phase motor.
7. The system of claim 5, wherein the main control module is further configured to obtain a set frequency of the single-phase motor, and perform processing of acceleration and deceleration time on the set frequency to obtain a current time set frequency;
the main control module is also used for acquiring a deviation signal between the frequency WmId and the given frequency at the current moment according to a speed identification method, and performing PI regulation on the deviation signal to acquire a given value of the torque current.
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| CN111162685B (en) * | 2020-01-17 | 2020-09-29 | 深圳市东力科创技术有限公司 | Control method and system of single-phase photovoltaic water pump inverter with BOOST boosting function |
| CN112260607A (en) * | 2020-11-03 | 2021-01-22 | 儒竞艾默生环境优化技术（上海）有限公司 | Motor driver, motor speed control method and control system |
| CN113938071B (en) * | 2021-09-06 | 2023-12-19 | 上海新时达电气股份有限公司 | Space vector modulation method and device for driving single-phase motor by three-phase inverter |
| CN113783476B (en) * | 2021-09-16 | 2024-04-05 | 深圳市海浦蒙特科技有限公司 | Single-phase motor control method, device and system |
| CN116865630B (en) * | 2023-08-09 | 2023-12-08 | 东营市沃格艾迪石油技术有限公司 | Motor variable-frequency speed regulation control system |
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| JP2858692B2 (en) * | 1996-12-05 | 1999-02-17 | 株式会社安川電機 | Sensorless control method and device for permanent magnet type synchronous motor |
| JP4674516B2 (en) * | 2005-09-27 | 2011-04-20 | 株式会社デンソー | Method for estimating magnetic pole position of synchronous motor |
| CN103187919B (en) * | 2011-12-28 | 2016-06-15 | 苏州汇川技术有限公司 | A kind of system and method for permagnetic synchronous motor weak-magnetic speed-regulating |
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