CN119232027A - Frequency converter control method, storage medium, controller, and air conditioner - Google Patents
Frequency converter control method, storage medium, controller, and air conditioner Download PDFInfo
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- CN119232027A CN119232027A CN202310802862.5A CN202310802862A CN119232027A CN 119232027 A CN119232027 A CN 119232027A CN 202310802862 A CN202310802862 A CN 202310802862A CN 119232027 A CN119232027 A CN 119232027A
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- 239000003990 capacitor Substances 0.000 claims abstract description 32
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Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a control method of a frequency converter, a storage medium, a controller and an air conditioner. The frequency converter comprises an inverter bridge and an electrolytic capacitor connected with a direct current end of the inverter bridge in parallel, wherein the alternating current end of the inverter bridge is used for connecting a load, the electrolytic capacitor is also used for connecting a direct current bus, the frequency converter comprises the steps of determining a comparison value of switching devices on each bridge arm according to the duty ratio and the carrier period of the switching devices on each bridge arm of the inverter bridge, and adjusting the state signals output by the switching devices on each bridge arm according to the comparison value and the carrier of the state signals so as to reduce the fluctuation times of direct current bus current. According to the method, the comparison value of the switching devices on each bridge arm is determined, and the state signals output by the switching devices on each bridge arm are adjusted according to the comparison value and the carrier waves of the state signals, so that the number of times of large fluctuation of current on a direct current bus is reduced, the number of times of severe charge and discharge of the electrolytic capacitor is reduced, and the purpose of prolonging the service life of the electrolytic capacitor is achieved.
Description
Technical Field
The invention relates to the field of control methods of frequency converters, in particular to a control method of a frequency converter, a storage medium, a controller and an air conditioner.
Background
The compressor in the variable frequency air conditioner is usually driven and controlled by an AC-DC-AC frequency converter. The alternating current outputs direct current voltage through the rectifier, and then provides stable direct current voltage for the inverter through the electrolytic capacitor.
The related art generally adopts voltage space vector modulation to control switching devices of three bridge arms of an inverter, so as to output alternating voltage to control a compressor. However, in each switching cycle of the inverter switching device, the technology can cause the busbar current to fluctuate greatly twice, so that the electrolytic capacitor is charged and discharged severely, and the service life of the electrolytic capacitor is reduced.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a control method of a frequency converter, which can prolong the service life of an electrolytic capacitor and improve the stability of the frequency converter by reducing the fluctuation times of the dc bus current.
A second object of the present invention is to propose a computer readable storage medium.
A third object of the present invention is to propose a controller.
A fourth object of the present invention is to provide an air conditioner.
In order to achieve the above purpose, an embodiment of the first aspect of the present invention provides a control method of a frequency converter, where the frequency converter includes an inverter bridge and an electrolytic capacitor connected in parallel with a dc end of the inverter bridge, the ac end of the inverter bridge is used to connect a load, and the electrolytic capacitor is further used to connect a dc bus, and the method includes determining a comparison value of each switching device on each bridge arm according to a duty ratio and a carrier period of a state signal output by each switching device on each bridge arm of the inverter bridge, and adjusting the state signal output by each switching device on each bridge arm according to the comparison value and a carrier of the state signal, so as to reduce the fluctuation times of the dc bus current.
According to the control method of the frequency converter, the comparison value of the switching devices on each bridge arm is determined again, and the state signals output by the switching devices on each bridge arm are adjusted according to the comparison value and the carrier waves of the state signals, so that the number of times of large fluctuation of current on the direct current bus is reduced, the number of times of severe charging and discharging of the electrolytic capacitor is reduced, and the purpose of prolonging the service life of the electrolytic capacitor is achieved.
In addition, the control method of the frequency converter according to the above embodiment of the present invention may further have the following additional technical features:
According to one embodiment of the invention, the inverter bridge comprises three-phase bridge arms, the state signals output by the switching devices on the bridge arms are adjusted according to the comparison values and the carrier waves of the state signals, the inverter bridge comprises a maximum value, a middle value and a minimum value in the comparison values, the load phase current direction connected with the bridge arm corresponding to the middle value is obtained, if the load phase current flows out, a new middle value and a new minimum value are determined according to the maximum value, the middle value, the minimum value and the amplitude of the carrier waves, the switching devices on the bridge arm corresponding to the maximum value are controlled to continuously output high levels, the output levels of the switching devices on the bridge arm corresponding to the new middle value are adjusted according to the new middle value and the instantaneous values of the carrier waves, and the output levels of the switching devices on the bridge arm corresponding to the new minimum value are adjusted according to the new minimum value and the instantaneous values of the carrier waves.
According to one embodiment of the invention, if the load flows into the load direction, a new maximum value and a new intermediate value are determined according to the minimum value, the maximum value and the intermediate value, the upper bridge arm switching device corresponding to the minimum value is controlled to continuously output a low level, the output level of the upper bridge arm switching device corresponding to the new intermediate value is adjusted according to the new intermediate value and the instantaneous value of the carrier wave, and the output level of the upper bridge arm switching device corresponding to the new maximum value is adjusted according to the new maximum value and the instantaneous value of the carrier wave.
According to one embodiment of the invention, a new intermediate value and a new minimum value are determined according to the maximum value, the intermediate value, the minimum value and the amplitude of the carrier, wherein the method comprises the steps of calculating the difference value between the maximum value and the amplitude to obtain a first offset value, calculating the sum value of the intermediate value and the first offset value to obtain the new intermediate value, and calculating the sum value of the minimum value and the first offset value to obtain the new minimum value.
According to one embodiment of the invention, a new maximum value and a new intermediate value are determined from the minimum value, the maximum value and the intermediate value, including calculating a difference between the minimum value and the intermediate value to obtain a new intermediate value, and calculating a difference between the minimum value and the maximum value to obtain a new maximum value.
According to one embodiment of the invention, the adjusting the output level of the bridge arm upper switch device corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave comprises controlling the bridge arm upper switch device corresponding to the new intermediate value to output a low level if the instantaneous value of the carrier wave is greater than the new intermediate value, controlling the bridge arm upper switch device corresponding to the new intermediate value to output a high level if the instantaneous value of the carrier wave is less than or equal to the new intermediate value, or controlling the bridge arm upper switch device corresponding to the new intermediate value to output a high level if the instantaneous value of the carrier wave is greater than the new intermediate value, and controlling the bridge arm upper switch device corresponding to the new intermediate value to output a low level if the instantaneous value of the carrier wave is less than or equal to the new intermediate value.
According to one embodiment of the invention, the adjusting the output level of the switching device on the bridge arm corresponding to the new minimum value according to the new minimum value and the instantaneous value of the carrier wave comprises controlling the output low level of the switching device on the bridge arm corresponding to the new minimum value if the instantaneous value of the carrier wave is greater than the new minimum value, and controlling the output high level of the switching device on the bridge arm corresponding to the new minimum value if the instantaneous value of the carrier wave is less than the new minimum value.
According to one embodiment of the invention, the adjusting the output level of the switching device on the bridge arm corresponding to the new maximum value according to the new maximum value and the instantaneous value of the carrier wave comprises controlling the output low level of the switching device on the bridge arm corresponding to the new maximum value if the instantaneous value of the carrier wave is greater than the new maximum value, and controlling the output high level of the switching device on the bridge arm corresponding to the new maximum value if the instantaneous value of the carrier wave is less than the new maximum value.
To achieve the above object, an embodiment of a second aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing a control method for a frequency converter according to the embodiment of the first aspect of the present invention.
To achieve the above object, an embodiment of a third aspect of the present invention provides a controller, including a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the control method of a frequency converter according to the embodiment of the first aspect of the present invention is implemented.
To achieve the above object, an embodiment of a fourth aspect of the present invention provides an air conditioner, which includes a frequency converter and a controller according to an embodiment of a third aspect of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a diagram of the output states of switching devices on each leg of an inverter bridge in a related space vector modulation technique;
FIG. 2 is a control circuit diagram of a frequency converter according to an embodiment of the invention;
FIG. 3 is a flow chart of a control method of a frequency converter according to an embodiment of the invention;
FIG. 4 is a flow chart of adjusting the status signals output by the switching devices on each leg according to an embodiment of the present invention;
FIG. 5 is a flow chart of determining new intermediate values and new minimum values in accordance with an embodiment of the present invention;
FIG. 6 is a flow chart of determining a new maximum value and a new intermediate value in accordance with an embodiment of the present invention;
FIG. 7 is a state diagram of the output of the switching devices on each leg corresponding to the direction of the outgoing load for the load phase current connected to the leg corresponding to the intermediate value according to an embodiment of the present invention;
FIG. 8 is a state diagram of the output of the switching devices on each bridge arm corresponding to the direction of the load flowing into the load phase current connected to the bridge arm corresponding to the intermediate value according to an embodiment of the present invention;
FIG. 9 is a state diagram of the output of the switching devices on each leg corresponding to the direction of the outgoing load for the load phase current connected to the leg corresponding to the intermediate value according to another embodiment of the present invention;
FIG. 10 is a state diagram of the output of the switching devices on each leg corresponding to the direction of the incoming load for the load phase current connected to the leg corresponding to the intermediate value according to another embodiment of the present invention;
FIG. 11 is a block diagram of a controller according to an embodiment of the present invention;
Fig. 12 is a schematic view of an air conditioner according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a control method of the frequency converter, a storage medium, a controller, and an air conditioner according to embodiments of the present invention in detail with reference to fig. 1 to 12 of the specification and specific embodiments.
Fig. 1 shows an output state diagram of switching devices on each leg of an inverter bridge in a related space vector modulation method. It should be noted that, according to the operating states of the switching devices of the three bridge arms of the inverter, the space vector modulation has 8 basic voltage vectors, namely 6 effective voltage vectors and 2 zero voltage vectors. In each switching cycle of the switching device, the space vector modulation synthesizes a desired voltage vector with 2 effective voltage vectors and 2 zero voltage vectors. The zero voltage vector in the space vector modulation method will form a current on the dc bus, while the effective voltage vector will not form a current on the dc bus. Therefore, in each switching period of the switching devices on each bridge arm of the inverter, the bus current can be greatly fluctuated twice, and the electrolytic capacitor is severely charged and discharged.
The frequency converter in the control method of the frequency converter of the embodiment of the invention can comprise an inverter bridge and an electrolytic capacitor connected in parallel with the direct current end of the inverter bridge, wherein the alternating current end of the inverter bridge is used for connecting a load, and the electrolytic capacitor is also used for connecting a direct current bus. Fig. 2 is a control circuit diagram of a frequency converter according to an embodiment of the invention.
Fig. 3 is a flowchart of a control method of a frequency converter according to an embodiment of the invention. As shown in fig. 3, the control method of the frequency converter may include:
S101, determining a comparison value of the switching devices on each bridge arm according to the duty ratio and the carrier period of the output state signals of the switching devices on each bridge arm of the inverter bridge;
S102, adjusting the state signals output by the switching devices on each bridge arm according to the comparison value and the carrier wave of the state signals so as to reduce the fluctuation times of the direct current bus current.
In order to prolong the service life of the electrolytic capacitor, the embodiment of the invention adjusts the state signals output by the switching devices on each bridge arm according to the comparison value and the instantaneous value of the carrier wave by re-determining the comparison value of the switching devices on each bridge arm so as to reduce the number of times of great fluctuation of current on the direct current bus, thereby reducing the number of times of severe charge and discharge of the electrolytic capacitor, achieving the purpose of prolonging the service life of the electrolytic capacitor and improving the stability of the frequency converter.
Specifically, the switching devices on each leg of the inverter bridge output a state signal, i.e. PWM (Pulse
Width modulation) signal duty cycle and carrier period, and determines the comparison value of the switching devices on each bridge arm. Comparing the comparison values of the switching devices on each bridge arm, and redefining the comparison values of the switching devices on each bridge arm according to the comparison results (maximum value, intermediate value and minimum value) and the load phase current direction connected with the bridge arm corresponding to the intermediate value, so as to adjust the output states of the switching devices on each bridge arm according to the redetermined comparison values and the instantaneous value of the carrier wave, thereby reducing the fluctuation times of the direct current bus current, reducing the times of severe charge and discharge of the electrolytic capacitor, achieving the purpose of prolonging the service life of the electrolytic capacitor, and improving the stability of the frequency converter.
In one embodiment of the present invention, as shown in fig. 4, the inverter bridge includes three-phase bridge arms, and the adjusting the state signal output by the switching device on each bridge arm according to the comparison value and the carrier of the state signal includes:
s201, determining the maximum value, the intermediate value and the minimum value in the comparison value;
s202, obtaining a load phase current direction of bridge arm connection corresponding to the intermediate value;
S203, if the load direction is the outflow load direction, determining a new intermediate value and a new minimum value according to the maximum value, the intermediate value, the minimum value and the amplitude of the carrier wave;
and S204, continuously outputting a high level by the bridge arm upper switching device corresponding to the maximum value, adjusting the output level of the bridge arm upper switching device corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave, and adjusting the output level of the bridge arm upper switching device corresponding to the new minimum value according to the new minimum value and the instantaneous value of the carrier wave.
Because the inverter bridge comprises three-phase bridge arms, according to the duty ratio and the carrier period of the output state signals of the switching devices on each bridge arm, the comparison values of the switching devices on the three-phase bridge arms can be obtained, and then the three comparison values can be obtained.
The embodiment of the invention compares the obtained three comparison values, and determines the largest comparison value (maximum value), the middle comparison value (middle value) and the smallest comparison value (minimum value) in the three comparison values.
In the embodiment of the invention, when the comparison value of the switching devices on each bridge arm is redetermined, the load phase current direction of the bridge arm connection corresponding to the intermediate value (intermediate comparison value) is also obtained. And determining a comparison value to be redetermined according to the load phase current direction of the bridge arm connection corresponding to the intermediate value (intermediate comparison value).
Specifically, if the load phase current direction of the arm connection corresponding to the intermediate value (intermediate comparison value) is the outflow load direction, it is necessary to newly determine the comparison value as the intermediate value (intermediate comparison value) and the minimum value (minimum comparison value). Further specifically, a new intermediate value and a new minimum value may be determined based on the maximum value, the intermediate value, the minimum value, and the magnitude of the carrier.
In this embodiment, as shown in fig. 5, determining the new intermediate value and the new minimum value based on the maximum value, the intermediate value, the minimum value, and the amplitude of the carrier may include:
S301, calculating a difference value between the maximum value and the amplitude value to obtain a first offset value;
S302, calculating the sum of the intermediate value and the first offset value to obtain a new intermediate value;
S303, calculating the sum of the minimum value and the first offset value to obtain a new minimum value.
Specifically, a difference between the maximum value (the largest comparison value) of the switching devices on the three bridge arms and the amplitude of the carrier wave is calculated, so as to obtain a first offset value. The new intermediate value and the new minimum value are redetermined based on the first offset value. Further specifically, a sum of the intermediate value (intermediate comparison value) and the first offset value is calculated, resulting in a new intermediate value. And calculating the sum value of the minimum value (the minimum comparison value) and the first offset value to obtain a new minimum value.
After the new intermediate value and the new minimum value are determined, the switching device on the bridge arm corresponding to the maximum value (the maximum comparison value) is controlled to continuously output high level. And adjusting the output level of the switching device on the bridge arm corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave. And adjusting the output level of the switching device on the bridge arm corresponding to the new minimum value according to the new minimum value and the instantaneous value of the carrier wave.
In another embodiment of the present invention, as shown in figure 4,
S205, if the flow is in the load direction, determining a new maximum value and a new intermediate value according to the minimum value, the maximum value and the intermediate value;
S206, continuously outputting a low level by the bridge arm upper switching device corresponding to the control minimum value, adjusting the output level of the bridge arm upper switching device corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave, and adjusting the output level of the bridge arm upper switching device corresponding to the new maximum value according to the new maximum value and the instantaneous value of the carrier wave.
Specifically, if the load phase current direction of the arm connection corresponding to the intermediate value (intermediate comparison value) is the inflow load direction, it is necessary to newly determine the maximum value (maximum comparison value) and the intermediate value (intermediate comparison value). More specifically, the new maximum value and the new intermediate value are determined from the minimum value (minimum comparison value), the maximum value (maximum comparison value), and the intermediate value (intermediate comparison value).
In this embodiment, as shown in fig. 6, determining a new maximum value and a new intermediate value from the minimum value, the maximum value, and the intermediate value may include:
s401, calculating the difference between the minimum value and the intermediate value to obtain a new intermediate value;
S402, calculating the difference between the minimum value and the maximum value to obtain a new maximum value.
Specifically, the difference between the minimum value (minimum comparison value) and the intermediate value (intermediate comparison value) among the switching devices on the three bridge arms is calculated, and the difference is obtained as a new intermediate value. And calculating the difference between the minimum value (the minimum comparison value) and the maximum value (the maximum comparison value) of the switching devices on the three bridge arms, and taking the obtained difference as a new maximum value.
After the new maximum value and the new intermediate value are determined, the switching device on the bridge arm corresponding to the control minimum value (minimum comparison value) continuously outputs low level. And adjusting the output level of the switching device on the bridge arm corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave. And adjusting the output level of the switching device on the bridge arm corresponding to the new maximum value according to the new maximum value and the instantaneous value of the carrier wave.
In one embodiment of the present invention, adjusting the output level of the switching device on the bridge arm corresponding to the new intermediate value according to the new intermediate value and the instantaneous value of the carrier wave may include:
If the instantaneous value of the carrier wave is larger than the new intermediate value, the switching device on the bridge arm corresponding to the new intermediate value is controlled to output low level, if the instantaneous value of the carrier wave is smaller than or equal to the new intermediate value, the switching device on the bridge arm corresponding to the new intermediate value is controlled to output high level, or
And if the instantaneous value of the carrier is smaller than or equal to the new intermediate value, controlling the upper switching device of the bridge arm corresponding to the new intermediate value to output a low level.
In the embodiment of the invention, the output level of the switching device on the bridge arm corresponding to the new intermediate value has the two output control modes.
In one embodiment of the present invention, adjusting the output level of the switching device on the bridge arm corresponding to the new minimum value according to the new minimum value and the instantaneous value of the carrier wave may include:
And if the instantaneous value of the carrier is smaller than the new minimum value, controlling the output high level of the bridge arm switching device corresponding to the new minimum value.
In the embodiment of the invention, the output level of the switching device on the bridge arm corresponding to the new minimum value is controlled by the output control mode.
In one embodiment of the present invention, adjusting the output level of the switching device on the bridge arm corresponding to the new maximum value according to the new maximum value and the instantaneous value of the carrier wave may include:
and if the instantaneous value of the carrier is smaller than the new maximum value, controlling the output high level of the bridge arm switching device corresponding to the new maximum value.
In the embodiment of the invention, the output level of the switching device on the bridge arm corresponding to the new maximum value is controlled by the output control mode.
As a specific embodiment, when the load phase current connected to the bridge arm corresponding to the intermediate value is the flowing load direction, the comparison value needs to be redetermined into the intermediate value (intermediate comparison value) and the minimum value (minimum comparison value), and after the new intermediate value and the new minimum value are obtained by calculating the new intermediate value and the new minimum value, the level states of the switching devices on the bridge arm corresponding to the maximum value, the new intermediate value and the new minimum value are controlled by using the control output mode. The level states of the switching device outputs on the bridge arm corresponding to the maximum value, the new intermediate value and the new minimum value are shown in fig. 7. It should be noted that, in fig. 7, when the instantaneous value of the carrier wave is greater than the new intermediate value, the level output by the switching device on the bridge arm corresponding to the new intermediate value is controlled to output a low level, and when the instantaneous value of the carrier wave is less than or equal to the new intermediate value, the switching device on the bridge arm corresponding to the new intermediate value is controlled to output a high level, so that the three-phase bridge arm of the inverter bridge only has a state that the output of the three-phase bridge arm is all high level once, and no state that the output of the three-phase bridge arm is all low level exists, i.e. only has a zero voltage vector. The control method of the frequency converter reduces the number of zero voltage vectors, thereby reducing the fluctuation times of direct current bus current, reducing the times of severe charge and discharge of the electrolytic capacitor and achieving the purpose of prolonging the service life of the electrolytic capacitor
When the load phase current of the bridge arm connection corresponding to the intermediate value is in the flowing load direction, the maximum value (the maximum comparison value) and the intermediate value (the intermediate comparison value) are required to be determined again, the new intermediate value and the new maximum value are obtained by utilizing the mode of calculating the new intermediate value and the new maximum value, and then the level state of the switching device output on the bridge arm corresponding to the minimum value, the new intermediate value and the new maximum value is controlled by utilizing the control output mode. The level states of the switching device outputs on the bridge arm corresponding to the minimum value, the new intermediate value and the new maximum value are shown in fig. 8. It should be noted that, in fig. 8, the level of the output of the switching device on the bridge arm corresponding to the new intermediate value controls the switching device on the bridge arm corresponding to the new intermediate value to output the low level when the instantaneous value of the carrier is greater than the new intermediate value, and controls the switching device on the bridge arm corresponding to the new intermediate value to output the high level when the instantaneous value of the carrier is less than or equal to the new intermediate value. The three-phase bridge arm of the inverter bridge only has a state that the output of the three-phase bridge arm is all low level once, and has no state that the output of the three-phase bridge arm is all high level, namely only has one zero voltage vector. The control method of the frequency converter reduces the number of zero voltage vectors, thereby reducing the fluctuation times of direct current bus current, reducing the times of severe charge and discharge of the electrolytic capacitor and achieving the purpose of prolonging the service life of the electrolytic capacitor.
In another embodiment of the present invention, the level output by the switching device on the bridge arm corresponding to the new intermediate value outputs a high level when the instantaneous value of the carrier is greater than the new intermediate value, and outputs a low level state diagram when the instantaneous value of the carrier is less than or equal to the new intermediate value. And the load phase current connected with the bridge arm corresponding to the intermediate value is in the flowing load direction, so that the three-phase bridge arm of the inverter bridge does not have a state that the output of the three-phase bridge arm is all high level and a state that the output of the three-phase bridge arm is all low level, and the inverter bridge is see fig. 9. And the load phase current connected with the bridge arm corresponding to the intermediate value is in the flowing load direction, so that the three-phase bridge arm of the inverter bridge does not have a state that the output of the three-phase bridge arm is all low level and a state that the output of the three-phase bridge arm is all high level, and the inverter bridge is see fig. 10. Therefore, in the embodiment, no zero voltage vector exists, so that the times of severe charge and discharge of the electrolytic capacitor are further reduced, and the purpose of prolonging the service life of the electrolytic capacitor is achieved.
According to the control method of the frequency converter, the state signals output by the switching devices on the bridge arms are adjusted according to the motor phase current direction, the comparison value of the switching devices on the bridge arms and the instantaneous value of the carrier wave, so that the number of bus current fluctuation and the charging and discharging times of the electrolytic capacitor are reduced, and the service life of the electrolytic capacitor is prolonged.
The invention provides a computer readable storage medium.
In this embodiment, a computer program is stored on a computer readable storage medium, and when the computer program is executed by a processor, the control method of the frequency converter as described above is implemented.
The invention provides a controller.
In this embodiment, the controller includes a memory and a processor, and the memory stores a computer program, and when the computer program is executed by the processor, the control method of the frequency converter is implemented as described above.
Fig. 11 is a block diagram of a controller according to an embodiment of the present invention. As shown in fig. 11, the controller 500 includes a processor 501 and a memory 503. The processor 501 is coupled to a memory 503, such as via a bus 502. Optionally, the controller 500 may also include a transceiver 504. It should be noted that, in practical applications, the transceiver 504 is not limited to one, and the structure of the controller 500 is not limited to the embodiment of the present invention.
The processor 501 may be a CPU (central processing unit), general purpose processor, DSP (digital signal processor), ASIC (ApplicationSpecificIntegratedCircuit ), FPGA (FieldProgrammableGateArray, field programmable gate array) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various exemplary logical blocks, modules, and circuits described in connection with the present disclosure. The processor 501 may also be a combination that implements computing functionality, such as a combination comprising one or more microprocessors, a combination of a DSP and a microprocessor, and the like.
Bus 502 may include a path to transfer information between the components. Bus 502 may be a PCI (PeripheralComponentInterconnect, peripheral component interconnect standard) bus, or an EISA (ExtendedIndustryStandardArchitecture ) bus, or the like. The bus 502 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.
The memory 503 is used to store a computer program corresponding to the control method of the frequency converter of the above embodiment of the present invention, which is controlled to be executed by the processor 501. The processor 501 is configured to execute a computer program stored in the memory 503 to implement what is shown in the foregoing method embodiments. The controller 500 shown in fig. 11 is only an example, and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.
The invention provides an air conditioner.
Fig. 12 is a schematic view of an air conditioner according to an embodiment of the present invention. As shown in fig. 12, the air conditioner 1000 may include a frequency converter 600 and a controller 500 as described above.
The frequency converter 600 in the air conditioner according to the embodiment of the present invention is controlled by adopting the control method of the frequency converter stored in the controller 500, so as to reduce the times of severe charging and discharging of the electrolytic capacitor and prolong the service life of the electrolytic capacitor, thereby improving the stability of the frequency converter and improving the performance of the air conditioner.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include an electrical connection (an electronic device) having one or more wires, a portable computer diskette (a magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of techniques known in the art, discrete logic circuits with logic gates for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (11)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310802862.5A CN119232027A (en) | 2023-06-30 | 2023-06-30 | Frequency converter control method, storage medium, controller, and air conditioner |
| PCT/CN2024/097807 WO2025001804A1 (en) | 2023-06-30 | 2024-06-06 | Control method for frequency converter, and storage medium, controller and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310802862.5A CN119232027A (en) | 2023-06-30 | 2023-06-30 | Frequency converter control method, storage medium, controller, and air conditioner |
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| CN119232027A true CN119232027A (en) | 2024-12-31 |
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| CN202310802862.5A Pending CN119232027A (en) | 2023-06-30 | 2023-06-30 | Frequency converter control method, storage medium, controller, and air conditioner |
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| WO (1) | WO2025001804A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2712418B2 (en) * | 1988-11-17 | 1998-02-10 | 三菱電機株式会社 | Pulse width modulation type inverter device |
| JP4643670B2 (en) * | 2008-03-07 | 2011-03-02 | 株式会社東芝 | Electric car drive |
| CN104796030B (en) * | 2015-04-21 | 2017-09-22 | 西安理工大学 | Single-phase photovoltaic off-grid inverter and its soft switching control method based on quasi- Z-source inverter |
| CN106787968B (en) * | 2016-12-28 | 2019-06-28 | 江苏经纬轨道交通设备有限公司 | Inhibit the electric braking control system and method for bus fluctuation |
| JP7284645B2 (en) * | 2019-06-19 | 2023-05-31 | 株式会社Soken | Rotating electric machine control device |
| CN110719045B (en) * | 2019-10-29 | 2021-06-01 | 中车长春轨道客车股份有限公司 | Chopping control system of traction inverter |
| CN115149880A (en) * | 2022-06-10 | 2022-10-04 | 珠海格力电器股份有限公司 | Frequency converter control method and device, electronic equipment and storage medium |
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