CN116436348A - Shutdown control method and system for variable frequency compressor - Google Patents

Shutdown control method and system for variable frequency compressor Download PDF

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Publication number
CN116436348A
CN116436348A CN202310369412.1A CN202310369412A CN116436348A CN 116436348 A CN116436348 A CN 116436348A CN 202310369412 A CN202310369412 A CN 202310369412A CN 116436348 A CN116436348 A CN 116436348A
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China
Prior art keywords
variable frequency
frequency compressor
shutdown
temperature
max
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Chinese (zh)
Inventor
王卫红
何成志
何四发
尹小兵
张天富
陈曦
蒋静
黄超
黄宇轩
罗雨青
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Changhong Huayi Compressor Co ltd
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Changhong Huayi Compressor Co ltd
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Priority to CN202310369412.1A priority Critical patent/CN116436348A/en
Publication of CN116436348A publication Critical patent/CN116436348A/en
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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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/24—Arrangements for stopping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • 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
    • H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
    • 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
    • H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
    • 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
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • 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
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
    • 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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • 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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/28—Arrangements for controlling current
    • 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
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention mainly relates to the technical field of variable frequency compressors, and aims to solve the problems that an over-temperature over-current control is inaccurate, noise is high, vibration is large and damage to the variable frequency compressor is easy to occur in the shutdown process of the variable frequency compressor.

Description

Shutdown control method and system for variable frequency compressor
Technical Field
The invention mainly relates to the technical field of variable frequency compressors, in particular to a shutdown control method and system of a variable frequency compressor.
Background
The permanent magnet synchronous motor has the characteristics of simple structure, small volume, no mechanical commutator and convenient maintenance of the alternating current motor, and has the advantages of high torque density and reliable operation, thereby being widely applied to the refrigerator compressor. However, in the actual refrigerator matching process, the shutdown performance of the variable frequency compressor directly influences the refrigerator energy consumption matching test and the noise matching test because the operating environment and the using condition of the permanent magnet synchronous motor are worse. Therefore, how to improve the shutdown performance of the inverter compressor is one of the problems to be solved.
Disclosure of Invention
The invention aims to solve the technical problems that:
the shutdown control method for the variable frequency compressor solves the problems that the over-temperature and over-flow control of the variable frequency compressor is inaccurate, high in noise and vibration in the shutdown process, and the compressor is easy to damage.
The invention solves the technical problems by adopting the technical scheme that:
the shutdown control method of the variable frequency compressor comprises the following steps:
step 1, judging whether the temperature T1 of an electric appliance reaches a shutdown temperature T2; if yes, entering a step 5, and if not, entering a step 2;
step 2, current limiting variable speed control: judging average value I of three-phase current of variable frequency compressor a Whether the overcurrent threshold I of the intelligent power module of the variable frequency compressor is larger than or equal to MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering a step 3, and if not, entering a step 4;
step 3, reducing the rotating speed of the variable frequency compressor, and judging the three-phase current average value I of the variable frequency compressor when the rotating speed of the variable frequency compressor is reduced to the minimum value a Whether is smaller than the overcurrent threshold I of the intelligent power module of the variable frequency compressor MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering the step 1, and if not, entering the step 5;
step 4, temperature sectional control: by comparing the device temperature T of the intelligent power module with the over-temperature threshold T MAX Controlling the rotating speed of the variable frequency compressor; if T is less than or equal to T MAX Step 1 is entered; if T>T MAX Step 5 is entered;
step 5, steady speed control: variable frequency compressorThe rotation speed of the motor is adjusted to be the optimal shutdown rotation speed n 3 When the variable frequency compressor stops at the optimal stop rotating speed n 3 The running time t is greater than the set value, and the step 6 is entered; wherein the optimal shutdown rotational speed n 3 The rotation speed is the rotation speed when the vibration performance is optimal during the stable operation of the variable frequency compressor;
step 6, fixed angle shutdown control: comparing the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor with the optimal shutdown electric angle omega 1 When ω and ω 1 The difference value of the variable frequency compressor reaches a set value, and the variable frequency compressor is controlled to stop running; wherein the optimal shutdown electrical angle omega 1 The electric angle with the smallest load torque in one mechanical rotation period is the permanent magnet synchronous motor.
Further, in the step 4, when T is not more than T MAX At the time of 0.9T MAX ≤T≤T MAX The current rotation speed n of the variable frequency compressor 1 Adjusted to n 2 ＝n 1 * K, K is a proportionality constant, and enter step 1; if T<0.9T MAX The variable frequency compressor maintains the current rotation speed n 1 And (3) entering step 1.
Further, in step 6, the step of controlling the variable frequency compressor to stop running specifically includes that the frequency converter sends a stop signal, and the rotation speed input signal is set to zero.
Based on the method, the invention also provides a shutdown control system of the variable frequency compressor,
the system comprises a first sensor, a second sensor, a current limiting variable speed control module, a temperature segmentation control module, a speed stabilizing control module and a fixed angle shutdown control module;
the first sensor is used for measuring the temperature T1 of the electrical appliance; the control system controls the variable frequency compressor to enter current limiting variable speed control or steady speed control according to whether the measured temperature T1 of the first sensor reaches the shutdown temperature T2;
the current limiting variable speed control module is used for comparing the three-phase current average value I of the variable frequency compressor a Overcurrent threshold I of intelligent power module of variable frequency compressor MAX Controlling the variable frequency compressor to enter temperature subsection control or return to the measured electric appliance temperature T1 according to the comparison result;
the second sensor is used for collecting the device temperature T of the intelligent power module of the variable frequency compressor;
the temperature segmentation control module is used for comparing the device temperature T of the intelligent power module with an over-temperature threshold T MAX Controlling the variable frequency compressor to enter into stable speed control or return to the temperature T1 of the measuring electric appliance;
the speed stabilizing control module is used for adjusting the rotating speed of the variable frequency compressor to the optimal shutdown rotating speed n 3 ；
The fixed angle stopping module is used for stopping the variable frequency compressor at the optimal stopping rotating speed n 3 After the running time t exceeds a set value, measuring the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor, and stopping the electric angle omega of the permanent magnet synchronous motor and the optimal stop electric angle omega of the permanent magnet synchronous motor 1 When the difference value of the variable frequency compressor reaches a set value, the variable frequency compressor is controlled to stop running.
The invention has the beneficial effects that:
according to the shutdown control method of the variable frequency compressor, firstly, flexible regulation and control of the operation rotating speed of the variable frequency compressor are achieved through the current limiting variable speed control module and the temperature segmentation control module in sequence according to the actual operation working condition of the variable frequency compressor, then the speed stabilizing control module is adopted, the variable frequency compressor is enabled to stably operate at the optimal shutdown rotating speed corresponding to the optimal vibration performance before shutdown, finally the fixed angle shutdown module is adopted to achieve the purpose that the electric angle of the permanent magnet synchronous motor is adjusted to be at the position with the minimum load torque in one mechanical rotation period when the variable frequency compressor is shut down according to the load characteristic of the variable frequency compressor, and further shutdown vibration of the variable frequency compressor is reduced. The method not only can realize the effective control and intelligent protection of the overcurrent of the variable frequency compressor and the overtemperature of the frequency converter, but also can accurately control the shutdown characteristic of the variable frequency compressor, avoid the phenomena of high noise and large vibration when the variable frequency compressor is shut down, greatly reduce the risk of burning down the motor of the variable frequency compressor and damaging elements of the frequency converter, improve the high energy efficiency and the safety of the control system of the whole refrigerator, and has the advantages of reasonable design, simple use, high intelligence, strong safety and the like.
Drawings
Fig. 1 is a flowchart of a shutdown control method of a variable frequency compressor according to an embodiment of the present invention.
Fig. 2 is a load torque diagram of a variable frequency compressor permanent magnet synchronous motor during one mechanical cycle.
Detailed Description
As shown in fig. 1, the method for controlling the shutdown of the inverter compressor in the electrical appliance specifically comprises the following steps:
step 1, judging whether the temperature T1 of an electric appliance reaches a shutdown temperature T2; if yes, entering a step 5, and if not, entering a step 2;
step 2, current limiting variable speed control: judging average value I of three-phase current of variable frequency compressor a Whether the overcurrent threshold I of the intelligent power module of the variable frequency compressor is larger than or equal to MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering a step 3, and if not, entering a step 4;
step 3, reducing the rotating speed of the variable frequency compressor, and judging the three-phase current average value I of the variable frequency compressor when the rotating speed of the variable frequency compressor is reduced to the minimum value a Whether is smaller than the overcurrent threshold I of the intelligent power module of the variable frequency compressor MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering the step 1, and if not, entering the step 5;
step 4, temperature sectional control: by comparing the device temperature T of the intelligent power module with the over-temperature threshold T MAX Controlling the rotating speed of the variable frequency compressor; if T is less than or equal to T MAX Step 1 is entered; if T>T MAX Step 5 is entered;
step 5, steady speed control: adjusting the rotation speed of the variable frequency compressor to the optimal stop rotation speed n 3 When the variable frequency compressor stops at the optimal stop rotating speed n 3 The running time t is greater than the set value, and the step 6 is entered; wherein the optimal shutdown rotational speed n 3 The rotation speed is the rotation speed when the vibration performance is optimal during the stable operation of the variable frequency compressor;
step 6, fixed angle shutdown control: comparing the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor with the optimal shutdown electric angle omega 1 When ω and ω 1 The difference value of the variable frequency compressor reaches a set value, and the variable frequency compressor is controlled to stop running; wherein the optimal shutdown electrical angle omega 1 Is a permanent magnetThe synchronous motor is loaded at an electrical angle where torque is minimal during one mechanical revolution.
In the following embodiments, the shutdown control method of the variable frequency compressor of the present invention is described by taking shutdown control of the variable frequency compressor of the refrigerator as an example;
example 1:
the refrigerator control system is connected to a power supply, a starting signal is sent through a frequency converter, a variable-frequency compressor is started, and the refrigerating or freezing temperature T in the refrigerator is collected through a set sensor 1 If the refrigerating or freezing temperature T of the refrigerator 1 The method comprises the steps of controlling the variable frequency compressor to enter a steady speed control mode link when the set shutdown standard T2 is reached, transmitting an optimal shutdown rotating speed signal by the variable frequency compressor, and adjusting the actual rotating speed of the variable frequency compressor to the corresponding rotating speed n when the vibration performance of the variable frequency compressor is optimal during steady operation of the variable frequency compressor 3 It is preferably 1800rpm to 2400rpm, if the compressor is varied at an optimum rotational speed n 3 When the running time reaches a set time threshold, for example, 5 minutes, the variable frequency compressor is started to enter fixed-angle stop control, the MCU of the frequency converter is used for collecting the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor, the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor is the included angle between the magnetic pole axis of the rotor of the permanent magnet synchronous motor and the axis of the U-phase stator winding, and the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor is the mechanical angle theta of the permanent magnet synchronous motor M The relationship is ω=θ M X P, where P is the pole pair number of the PMSM, the mechanical angle θ of the PMSM is achieved by controlling the PMSM electrical angle ω M The control of the rotor position of the permanent magnet synchronous motor is further realized, and as shown in fig. 2, the load torque of the permanent magnet synchronous motor of the variable frequency compressor approximately shows Gaussian distribution (normal distribution) in one mechanical rotation period; the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor and the optimal shutdown electric angle omega of the permanent magnet synchronous motor are combined 1 Comparing ω and ω 1 The difference value is smaller than the set value, the frequency converter sends a stop signal, the rotating speed of the frequency conversion compressor is set to zero, and the frequency conversion compressor stops running. Optimal shutdown electrical angle omega of permanent magnet synchronous motor 1 A permanent magnet synchronous motor is selected to be arranged in oneThe electrical angle corresponding to the minimum load torque in the mechanical rotation period;
example 2:
the refrigerator control system is connected to a power supply, a starting signal is sent through a frequency converter, a variable-frequency compressor is started, and the refrigerating or freezing temperature T in the refrigerator is collected through a set sensor 1 When the refrigerating or freezing temperature T1 of the refrigerator does not reach the set shutdown temperature standard T2, the control of current limiting and speed changing is carried out, the MCU of the frequency converter is used for collecting the U, V, W three-phase current of the variable-frequency compressor, and the average value I of the three-phase current is calculated a Average value I of three-phase current a Overcurrent threshold I of Intelligent Power Module (IPM) of variable frequency compressor MAX Comparing, if the three-phase current average value I of the variable frequency compressor a Is smaller than the overcurrent threshold I of the intelligent power module MAX The variable frequency compressor operates according to the current state, enters temperature sectional control, acquires the device temperature T of the intelligent power module of the variable frequency compressor, and combines the device temperature of the intelligent power module with the over-temperature threshold T of the intelligent power module MAX Comparing, and adjusting the rotation speed of the variable frequency compressor according to the comparison result, wherein the current rotation speed of the variable frequency compressor is assumed to be n 1 If 0.9T MAX ≤T≤T MAX The actual running speed n of the variable frequency compressor is then calculated 1 Is adjusted to control the rotation speed n 2 The n is 2 ＝n 1 * K, wherein K is a proportionality constant, the optimal value of K is 75% -85%, and the temperature T1 of the electric appliance is returned to judge whether the temperature T2 reaches the set shutdown temperature; if T<0.9T MAX The inverter compressor maintains the current operation rotation speed n 1 And then returning to judge whether the temperature T1 of the electric appliance reaches the set shutdown temperature T2; if T a >T MAX Then the variable frequency compressor enters into stable speed control, and the rotating speed of the variable frequency compressor is adjusted to the optimal shutdown rotating speed n 3 Wherein the optimal shutdown rotational speed n 3 For the rotation speed when the vibration performance is optimal during the stable operation of the variable frequency compressor, when the variable frequency compressor stops at the optimal stop rotation speed n 3 After the running time t exceeds a set value, measuring the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor, and stopping the electric angle omega of the permanent magnet synchronous motor and the optimal stop electric angle of the permanent magnet synchronous motorω 1 When the difference value of the variable frequency compressor reaches a set value, the variable frequency compressor is controlled to stop running.
Example 3:
the refrigerator control system is connected to a power supply, a starting signal is sent through a frequency converter, a variable-frequency compressor is started, and the refrigerating or freezing temperature T in the refrigerator is collected through a set sensor 1 If the refrigerating or freezing temperature T of the refrigerator 1 The method comprises the steps of (1) when the set shutdown standard T2 is met, entering current-limiting variable speed control, collecting U, V, W three-phase currents of a variable frequency compressor through an MCU of a frequency converter, and calculating an average value I of the three-phase currents a Average value I of three-phase current a Overcurrent threshold I of Intelligent Power Module (IPM) of variable frequency compressor MAX Comparison, three-phase current average I of variable frequency compressor a Value is greater than or equal to intelligent power module overcurrent threshold I MAX The variable frequency compressor operates according to the current state, the operating rotation speed of the variable frequency compressor is collected through a singlechip (MCU) of the frequency converter, the operating rotation speed of the variable frequency compressor is regulated by adopting a variable speed control strategy, the variable frequency compressor is decelerated at a deceleration amplitude of 300rpm each time, and the three-phase current average value I of the variable frequency compressor is continuously obtained a Overcurrent threshold I with Intelligent Power Module (IPM) MAX Comparing, if the three-phase current average value I of the variable frequency compressor is reduced to the lowest rotating speed of the variable frequency compressor a Less than Intelligent Power Module (IPM) overcurrent threshold I MAX Returning to judge whether the temperature of the electric appliance reaches the set shutdown temperature again, if not, entering into stable speed control, and adjusting the rotating speed of the variable frequency compressor to the optimal shutdown rotating speed n 3 Wherein the optimal shutdown rotational speed n 3 For the rotation speed when the vibration performance is optimal during the stable operation of the variable frequency compressor, when the variable frequency compressor stops at the optimal stop rotation speed n 3 After the running time t exceeds a set value, measuring the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor, and stopping the electric angle omega of the permanent magnet synchronous motor and the optimal stop electric angle omega of the permanent magnet synchronous motor 1 When the difference value of the variable frequency compressor reaches a set value, the variable frequency compressor is controlled to stop running.

Claims (4)

1. The shutdown control method of the variable frequency compressor is applied to shutdown control of the variable frequency compressor in an electric appliance and is characterized by comprising the following steps of:
step 1, judging whether the temperature T1 of an electric appliance reaches a shutdown temperature T2; if yes, entering a step 5, and if not, entering a step 2;
step 2, current limiting variable speed control: judging average value I of three-phase current of variable frequency compressor a Whether the overcurrent threshold I of the intelligent power module of the variable frequency compressor is larger than or equal to MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering a step 3, and if not, entering a step 4;
step 3, reducing the rotating speed of the variable frequency compressor, and judging the three-phase current average value I of the variable frequency compressor when the rotating speed of the variable frequency compressor is reduced to the minimum value a Whether is smaller than the overcurrent threshold I of the intelligent power module of the variable frequency compressor MAX The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering the step 1, and if not, entering the step 5;
step 4, temperature sectional control: by comparing the device temperature T of the intelligent power module with the over-temperature threshold T MAX Controlling the rotating speed of the variable frequency compressor; if T is less than or equal to T MAX Step 1 is entered; if T>T MAX Step 5 is entered;
step 5, steady speed control: adjusting the rotation speed of the variable frequency compressor to the optimal stop rotation speed n 3 When the variable frequency compressor stops at the optimal stop rotating speed n 3 The running time t is greater than the set value, and the step 6 is entered; wherein the optimal shutdown rotational speed n 3 The rotation speed is the rotation speed when the vibration performance is optimal during the stable operation of the variable frequency compressor;
step 6, fixed angle shutdown control: comparing the electric angle omega of the permanent magnet synchronous motor of the variable frequency compressor with the optimal shutdown electric angle omega 1 When ω and ω 1 The difference value of the variable frequency compressor reaches a set value, and the variable frequency compressor is controlled to stop running; wherein the optimal shutdown electrical angle omega 1 The electric angle with the smallest load torque in one mechanical rotation period is the permanent magnet synchronous motor.
2. The method for controlling shutdown of a variable frequency compressor according to claim 1, wherein in the step 4, when T is equal to or less than T MAX At the time of 0.9T MAX ≤T≤T MAX The current rotation speed n of the variable frequency compressor 1 Adjusted to n 2 ＝n 1 * K, K is a proportionality constant, and enter step 1; if T<0.9T MAX The variable frequency compressor maintains the current rotation speed n 1 And (3) entering step 1.
3. The method for controlling the shutdown of the inverter compressor according to claim 1 or 2, wherein in step 6, the step of controlling the shutdown of the inverter compressor specifically comprises the step of sending a shutdown signal by the inverter and setting a rotation speed input signal to zero.
4. A variable frequency compressor shutdown control system for implementing the method of any one of claims 1-3, comprising a first sensor, a second sensor, a current limiting variable speed control module, a temperature segment control module, a speed stabilizing control module, and a fixed angle shutdown control module;
the first sensor is used for measuring the temperature T1 of the electrical appliance; the control system controls the variable frequency compressor to enter current limiting variable speed control or steady speed control according to whether the measured temperature T1 of the first sensor reaches the shutdown temperature T2;
the current limiting variable speed control module is used for comparing the three-phase current average value I of the variable frequency compressor a Overcurrent threshold I of intelligent power module of variable frequency compressor MAX Controlling the variable frequency compressor to enter temperature subsection control or return to the measured electric appliance temperature T1 according to the comparison result;
the second sensor is used for collecting the device temperature T of the intelligent power module of the variable frequency compressor;
the temperature segmentation control module is used for controlling the temperature segmentation control module according to the device temperature T of the intelligent power module and the overtemperature threshold T of the intelligent power module MAX Controlling the rotating speed of the variable frequency compressor according to the comparison result;
the speed stabilizing control module is used for adjusting the rotating speed of the variable frequency compressor to the optimal shutdown rotating speed n 3 ；
The fixed angle stopping module is used for stopping the variable frequency compressor at the optimal stopping rotating speed n 3 After the running time t exceeds a set value, measuring the permanent magnet of the variable frequency compressorThe electric angle omega of the step motor is equal to the optimal stop electric angle omega between the electric angle omega of the permanent magnet synchronous motor and the electric angle omega of the optimal stop electric motor 1 When the difference value of the variable frequency compressor reaches a set value, the variable frequency compressor is controlled to stop running.
CN202310369412.1A 2023-04-07 2023-04-07 Shutdown control method and system for variable frequency compressor Pending CN116436348A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117345630A (en) * 2023-12-05 2024-01-05 珠海格力电器股份有限公司 Control method and device of variable frequency screw compressor, electronic equipment and storage medium
CN117570007A (en) * 2024-01-04 2024-02-20 青岛三源泰科电子科技有限公司 Compressor control method and system for reducing shutdown vibration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117345630A (en) * 2023-12-05 2024-01-05 珠海格力电器股份有限公司 Control method and device of variable frequency screw compressor, electronic equipment and storage medium
CN117345630B (en) * 2023-12-05 2024-03-08 珠海格力电器股份有限公司 Control method and device of variable frequency screw compressor, electronic equipment and storage medium
CN117570007A (en) * 2024-01-04 2024-02-20 青岛三源泰科电子科技有限公司 Compressor control method and system for reducing shutdown vibration

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