CN113765383A - Voltage boosting and reducing control method and processor, relationship building method and processor - Google Patents

Voltage boosting and reducing control method and processor, relationship building method and processor Download PDF

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Publication number
CN113765383A
CN113765383A CN202111100732.4A CN202111100732A CN113765383A CN 113765383 A CN113765383 A CN 113765383A CN 202111100732 A CN202111100732 A CN 202111100732A CN 113765383 A CN113765383 A CN 113765383A
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motor
power value
optimal power
value
circuits
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陈红
方小斌
李百宇
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • H02P27/08—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 with pulse width modulation
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a buck-boost control method and a processor, and a relation building method and a processor. The buck-boost control method comprises the following steps: determining an optimal power value according to the current motor load grade; the corresponding relation between different motor load grades and the optimal power value is preset; adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the current motor power value; and the motor power value and the motor rotating speed have a corresponding relation. According to the invention, the bus voltage can be controlled to change along with the change of the rotating speed of the motor, and the operation efficiency of the motor is improved.

Description

Voltage boosting and reducing control method and processor, relationship building method and processor
Technical Field
The invention relates to the technical field of electronic power, in particular to a buck-boost control method and a processor, and a relation building method and a processor.
Background
In a classical circuit driven by a motor, if a power factor correction circuit is not arranged, the voltage of a direct current bus is a relatively fixed value, if the power factor correction circuit is arranged, under the condition of low load, the voltage reduction effect is realized by the power factor correction circuit, and the voltage of the direct current bus is stabilized at a specific voltage value which is less than the effective value of the voltage of a power grid; under the condition of high load, the power factor correction circuit realizes the boosting effect, and the voltage of the direct current bus is stabilized at a specific voltage value which is more than the effective value of the voltage of the power grid; therefore, the direct-current bus voltage of the motor driving circuit is only subjected to simple voltage boosting and reducing treatment, and is boosted or reduced to a certain fixed voltage value above or below the effective value of the power grid voltage, but is not changed along with the change of the rotating speed of the motor, so that the aim of controlling the motor to operate efficiently is still not achieved, and the operation efficiency of the motor is reduced.
Aiming at the problem that the control scheme in the prior art cannot control the change of the bus voltage along with the change of the rotating speed of the motor, so that the running efficiency of the motor is reduced, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a buck-boost control method and processor, and a relation building method and processor, and aims to solve the problem that the operation efficiency of a motor is reduced because the control scheme in the prior art cannot control the change of bus voltage along with the change of the rotating speed of the motor.
In order to solve the technical problem, the invention provides a buck-boost control method, which is applied to a power factor correction circuit, wherein the power factor correction circuit comprises at least two boost circuits and at least two buck circuits, and the buck-boost control method comprises the following steps:
determining an optimal power value according to the current motor load grade; the corresponding relation between different motor load grades and the optimal power value is preset;
adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the current motor power value; and the motor power value and the motor rotating speed have a corresponding relation.
Further, before adjusting the number of the boost circuits or the number of the buck circuits to be turned on according to the optimal power value and the motor power value at the current moment, the method further includes:
determining to perform a boosting operation or a step-down operation;
if the step-up operation is determined to be executed, adjusting the number of the started step-up circuits according to the optimal power value and the motor power value at the current moment;
and if the step-down operation is determined to be executed, adjusting the number of started step-down circuits according to the optimal power value and the motor power value at the current moment.
Further, determining to perform a step-up operation or a step-down operation includes:
acquiring a voltage value corresponding to the optimal power value;
and determining to execute a boosting operation or a voltage reduction operation according to the voltage value corresponding to the optimal power value and the induced electromotive force generated by the motor at the current moment.
Further, obtaining a voltage value corresponding to the optimal power value includes:
determining a motor rotating speed value corresponding to the optimal power value based on the corresponding relation between the motor rotating speed value and the motor power value;
and calculating a voltage value corresponding to the optimal power value according to the motor rotating speed value and the motor current value.
Further, determining to perform a step-up operation or a step-down operation according to the voltage value corresponding to the optimal power value and the induced electromotive force generated by the motor at the current moment, including:
judging whether the induced electromotive force is smaller than a voltage value corresponding to the optimal power value;
if so, determining to execute a boosting operation;
if not, determining to execute the voltage reduction operation.
Further, adjusting the number of the turned-on boost circuits according to the optimal power value and the current motor power value includes:
judging whether the power value of the motor at the current moment is smaller than the optimal power value;
if yes, increasing the number of the started booster circuits;
if not, the number of boost circuits currently on is maintained.
Further, adjusting the number of the voltage reduction circuits to be turned on according to the optimal power value and the current motor power value includes:
judging whether the power value of the motor at the current moment is smaller than the optimal power value;
if yes, increasing the number of the opened voltage reduction circuits;
if not, the number of the voltage reduction circuits which are currently started is kept.
Further, the preset corresponding relationship between different motor load levels and the optimal power value includes:
acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade;
and according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade, building the corresponding relation between different motor load grades and the optimal power value.
The invention also provides a relationship building method, which comprises the following steps:
acquiring a corresponding relation between a motor rotating speed value and a motor power value under each motor load level;
and according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade, building the corresponding relation between different motor load grades and the optimal power value.
Further, according to the corresponding relationship between the motor speed value and the motor power value under each motor load level, the corresponding relationship between different motor load levels and the optimal power value is established, and the method comprises the following steps:
determining scatter points by taking each motor load grade as an abscissa and taking the optimal power value corresponding to each motor load grade as an ordinate;
and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
The invention also provides a buck-boost control processor, which comprises:
the determining module is used for determining an optimal power value according to the current motor load level; the corresponding relation between different motor load grades and the optimal power value is preset;
the adjusting module is used for adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the motor power value at the current moment; and the motor power value and the motor rotating speed have a corresponding relation.
The invention also provides a relationship building processor, comprising:
the acquisition module is used for acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade;
and the relation building module is used for building the corresponding relation between different motor load grades and the optimal power value according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade.
The invention also provides a compressor, which comprises a motor and the boost-buck control processor.
Further, the compressor also comprises the relationship building processor.
The invention also provides an air conditioning unit which comprises the compressor.
The invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the above buck-boost control method.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described relationship building method.
By applying the technical scheme of the invention, the number of the started voltage boosting circuits or the number of the started voltage reducing circuits is adjusted according to the motor power value and the optimal power value at the current moment by acquiring the optimal power under different motor load grades, so that the bus voltage can be controlled to change along with the change of the motor rotating speed, and the motor operation efficiency is improved.
Drawings
FIG. 1 is a block diagram of a power factor correction circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a buck-boost control method according to an embodiment of the invention;
FIG. 3 illustrates a relationship between a motor speed and a motor power according to an embodiment of the present invention;
fig. 4 is a flowchart of a buck-boost control method according to another embodiment of the invention;
fig. 5 is a block diagram of a buck-boost control processor according to an embodiment of the present invention;
fig. 6 is a block diagram of a buck-boost control processor according to another embodiment of the present invention;
FIG. 7 is a flow chart of a relationship building method according to an embodiment of the present invention;
fig. 8 is a block diagram of a relationship building processor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a buck-boost control method, which is applied to a power factor correction circuit, and fig. 1 is a structural diagram of a power factor correction circuit according to an embodiment of the present invention, where the power factor correction circuit is disposed between a rectification circuit and an inverter circuit, the power factor correction circuit includes at least two boost circuits and at least two buck circuits, where the first buck circuit includes a first power switch Q1, a first inductor L1, and a first diode D1, the first power switch Q1 and the first inductor L1 are connected in series to a first line of a dc bus, an anode of the first diode D1 is connected to a second line of the dc bus, a cathode of the first diode D3683 is connected between the first power switch Q1 and the first inductor L1, the second buck circuit includes a second power switch Q2, a second inductor L2, a second diode D2, and an anode of the second diode D2 is connected to the first line of the dc bus, the cathode is connected between the second power switch tube Q2 and the second inductor L2; the first path of boosting circuit comprises a third power switch tube Q3, a first inductor L1 and a third diode D3, the first inductor L1 and the third diode D3 are connected in series to a first line of a direct current bus, the drain electrode of the third power switch tube Q3 is connected between a first inductor L1 and a third diode D3, and the source electrode of the third power switch tube Q1 is connected to a second line of the direct current bus, the second path of boosting circuit comprises a fourth power switch tube Q4, a second inductor L2 and a fourth diode D4, a second inductor L2 and a fourth diode D4 are connected in series to the first line of the direct current bus, the drain electrode of the fourth power switch tube Q4 is connected between a second inductor L2 and a fourth diode D4, and the source electrode of the fourth power switch tube Q4 is connected to the second line of the direct current bus. By analogy, the power factor correction circuit may further include a third step-down circuit, a fourth step-down circuit, and the like, and the structures of the third step-down circuit and the fourth step-down circuit are the same as those of the first step-down circuit and the second step-down circuit, and are connected in parallel with the first step-down circuit and the second step-down circuit; the power factor correction circuit may further include a third boost circuit, a fourth boost circuit, and the like, and the structures of the third boost circuit and the fourth boost circuit are the same as those of the first boost circuit and the second boost circuit, and the third boost circuit and the fourth boost circuit are connected in parallel with the first boost circuit and the second boost circuit. When the first power switch tube Q1 is always in an on state, the second power switch tube Q2 and the fourth power switch tube Q4 are always in an off state, the on-off state of the third power switch tube Q3 is controlled by a PWM wave, and the first path of the boost circuit is turned on; when the second power switch tube Q2 is always in an on state, the first power switch tube Q1 and the third power switch tube Q3 are always in an off state, and the on-off of the fourth power switch tube Q4 is controlled by a PWM wave, the second path of boost circuit is turned on; when the first power switch tube Q1 and the second power switch tube Q2 are always in an on state, and the on/off of the third power switch tube Q3 and the fourth power switch tube Q4 are controlled by the PWM wave, the first path of the boost circuit and the second path of the boost circuit are simultaneously turned on.
When the on-off of the first power switch tube Q1 is controlled by PWM waves, the second power switch tube Q2 and the fourth power switch tube Q4 are always in an off state, the third power switch tube Q3 is always in an on state, the first path of voltage reduction circuit is started, when the on-off of the second power switch tube Q2 is controlled by PWM waves, the first power switch tube Q2 and the third power switch tube Q3 are always in an off state, and the fourth power switch tube Q4 is always in an on state, the second path of voltage reduction circuit is started; when the on-off of the first power switch tube Q1 and the second power switch tube Q2 is controlled by PWM waves, and the third power switch tube Q3 and the fourth power switch tube Q4 are always in an on state, the first step-down circuit and the second step-down circuit are simultaneously started.
Fig. 2 is a flowchart of a buck-boost control method according to an embodiment of the present invention, as shown in fig. 2, the method includes:
s101, determining an optimal power value according to the current motor load level; wherein, the corresponding relation between different motor load grades and the optimal power value is preset.
In a specific implementation, the motor may be a compressor, and when the motor is a compressor, the motor load level may be determined by a discharge speed Vw of the compressor, for example, when the discharge speed Vw of the compressor is 8m/s, 10m/s, or 12m/s, the motor load level corresponds to different optimal power values, respectively.
S102, adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the motor power value at the current moment; the motor power value and the motor rotating speed have a corresponding relation.
According to the buck-boost control method, the optimal power under different motor load levels is obtained, the number of the boost circuits or the number of the buck circuits which are started is adjusted according to the motor power value and the optimal power value at the current moment, the bus voltage can be controlled to change along with the change of the motor rotating speed, and the motor operation efficiency is improved.
Example 2
In this embodiment, before adjusting the number of the turn-on of the boost circuit or the turn-on of the buck circuit, it is necessary to determine whether to perform the boost operation or the buck operation, and therefore, according to the optimal power value P, the step-up/step-down control method is performedm，optBefore the motor power value P at the current moment adjusts the number of the boost circuits or the number of the buck circuits, the method further includes: determining to perform a boosting operation or a step-down operation; if it is determined that the boosting operation is performed, according to the optimum power value Pm，optAdjusting the number of the started booster circuits according to the motor power value P at the current moment;if it is determined that the step-down operation is performed, the step-down operation is performed according to the optimum power value Pm，optAnd adjusting the number of the started voltage reduction circuits according to the motor power value P at the current moment.
Specifically, determining to perform a step-up operation or a step-down operation includes: obtaining the optimal power value Pm，optThe corresponding voltage value Umax; according to the optimum power value Pm，optThe corresponding voltage value Umax and the induced electromotive force Us generated by the motor at the present time determine whether to perform the step-up operation or the step-down operation. Wherein, according to the optimal power value Pm，optThe corresponding voltage value Umax and the induced electromotive force Us generated by the motor at the current moment determine to execute a step-up operation or a step-down operation, including: determining an optimal power value P based on a corresponding relationship between a motor speed value and a motor power valuem，optCorresponding motor speed value omegam(ii) a Wherein the motor speed value omegamThe corresponding relation with the motor power value P can be that the independent variable is the motor rotating speed value omegamThe dependent variable is a change curve of the motor power value P, namely a power curve; according to the motor speed value omegamAnd calculating a voltage value Umax corresponding to the optimal power value according to the motor current value. The specific calculation formula is as follows:
Figure BDA0003270608390000071
wherein Rs is motor stator resistance, LdD-axis inductance, L, of the rotor of the machineqFor the q-axis inductance of the motor rotor, idmax is the d-axis current of the motor when the optimal power is reached, iqmax is the q-axis current of the motor when the optimal power is reached, ωmTaking the motor speed as the reference value, and taking Ke as the back electromotive force coefficient of the motor; wherein, Rs and Ld、LqAnd Ke have no fixed value, and once the motor is determined, the parameters are determined.
For accurate determination of the execution of the step-up operation or the step-down operation, the optimum power value P is usedm，optThe corresponding voltage value Umax and the induced electromotive force Us generated by the motor at the current moment determine to execute a step-up operation or a step-down operation, including: judging whether the induced electromotive force Us is less than the optimal power value Pm，optCorrespond toThe voltage value of (Umax); if yes, indicating that the voltage of the direct current bus is too low, and determining to execute boosting operation; if not, indicating that the voltage of the direct current bus is too high, and determining to execute the voltage reduction operation. Wherein the induced electromotive force Us is calculated by the following formula:
Figure BDA0003270608390000081
wherein id is d-axis current of the motor at the current moment, and iq is q-axis current of the motor at the current moment; wherein,
Figure BDA0003270608390000082
iαcurrent of alpha axis, iβCurrent of beta axis, iαAnd iβIs obtained by three-phase current iu, iv and iw through three-phase-two-phase coordinate transformation, wherein
Figure BDA0003270608390000083
Representing the rotational coordinate system angle.
The induced electromotive force Us may also be calculated by the following formula:
Figure BDA0003270608390000084
wherein u isαIs the voltage of the α axis at the present moment, uβIs the voltage of the beta axis at the present moment, uαAnd uβThe collected three-phase currents iu, iv and iw of the motor in operation are converted into the current i of the alpha axis through a three-phase-two-phase coordinateαBeta axis current iβThen obtaining the voltage u through proportional-integral controlαAnd uβ。
After the boosting operation is determined to be performed, according to the optimum power value Pm，optAnd the motor power value P at the current moment adjusts the number of the started booster circuits, and the method comprises the following steps: judging whether the motor power value at the current moment is less than the optimal power value Pm，opt(ii) a If yes, the motor power value is not reached to the optimal power value Pm，optThe number of boost circuits that are turned on needs to be increased continuously, and for precise power control, only one boost circuit is used at a timeAdding a path of booster circuit; if not, the motor power value is shown to reach the optimal power value Pm，optThe number of boost circuits currently on may be maintained. When the optimal power value power is higher than the current power value, the output power of the currently started booster circuit cannot reach the required optimal power value, so that a larger number of booster circuits need to be started.
Similarly, after the step-down operation is determined to be performed, adjusting the number of the started step-down circuits according to the optimal power value and the current motor power value includes: judging whether the motor power value at the current moment is less than the optimal power value Pm，opt(ii) a If yes, the motor power value is not reached to the optimal power value Pm，optThe number of voltage reduction circuits to be turned on needs to be increased continuously; if not, the motor power value is shown to reach the optimal power value Pm，optThe number of the step-down circuits that are currently turned on is maintained.
In this embodiment, the power value P of the motor at the current time is determined and calculated by the following formula:
Figure BDA0003270608390000091
wherein u isdIs the d-axis voltage, u, at the present momentqIs the q-axis voltage at the current moment;
Figure BDA0003270608390000092
uαand uβObtained by the process described above.
FIG. 3 shows a relationship between a motor speed and a motor power according to an embodiment of the present invention, where different motor load levels correspond to different optimal power values P, as shown in FIG. 3m，optIn order to obtain the optimal power value under the current motor load level, the corresponding relationship between different motor load levels and the optimal power value is preset, and the method comprises the following steps: acquiring a corresponding relation between a motor rotating speed value and a motor power value under each motor load grade, namely a power curve; obtaining different motor load grades and an optimal power value P according to a power curve under each motor load gradem，optCorresponding relationship ofThe corresponding relationship may be a curve. Specifically, different motor load grades and an optimal power value P are obtained according to a power curve under each motor load gradem，optThe corresponding relationship of (1) includes: taking each motor load grade as an abscissa, and taking the optimal power value P corresponding to each motor load gradem，optDetermining scatter points for the ordinate; and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
The present invention will be described in detail with reference to a specific embodiment. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In order to realize the optimal power tracking control, an optimal power value and a rotating speed corresponding to the optimal power value are determined according to the current motor load grade and are converted into induced electromotive force of the motor, and the bus voltage of the motor is controlled to be increased or decreased according to the induced electromotive force, so that the power value of the motor is adjusted; in the control process of the motor, the parameters required by the normal running of the motor are three-phase currents iu, iv and iw and the motor rotating speed omega of the permanent magnet synchronous motor during the running through a current and rotating speed sampling modulemReal-time detection and acquisition are carried out, and the acquired three-phase currents iu, iv and iw are subjected to three-phase-two-phase coordinate transformation to obtain iαAnd iβThen obtaining the voltage u through proportional-integral controlαAnd uβ. The motor speed value corresponding to the optimal power value is calculated, the voltage value corresponding to the optimal power value is calculated according to the current value at the same moment, the voltage value is compared with the induced electromotive force generated by the motor, and then the voltage of the direct current bus is determined to be boosted or reduced.
Because the motor has no rotating speed at the moment before running, a certain starting voltage is needed to start the motor, and the direct current bus voltage U must be greater than or equal to the optimal power value P in the running processm，optThe corresponding voltage value Umax; wherein the DC bus voltage
Figure BDA0003270608390000101
Where K is the voltage utilization.
Fig. 4 is a flowchart of a buck-boost control method according to another embodiment of the present invention, as shown in fig. 4, the method includes:
s1, obtaining the optimal power value P under the current load levelm，optAnd an optimum power value Pm,optthe corresponding voltage value Umax.
S2, judging that the induced electromotive force Us generated by the motor is smaller than the optimal power value Pm，optIf the corresponding voltage value Umax is established, if yes, step S3 is performed, and if no, step S7 is performed.
S3, it is determined to perform the boosting operation.
S4, judging that the motor power P at the current moment is less than the optimal power value Pm，optIf yes, the process returns to step S4 after step S5 is executed, and if no, step S6 is executed.
And S7, determining to execute the voltage reduction operation.
S8, judging that the motor power P at the current moment is less than the optimal power value Pm，optIf yes, the process returns to step S8 after step S9 is executed, and if no, step S10 is executed.
In specific implementation, the processor calculates and analyzes the obtained optimal power value Pm，optOptimum power value Pm，optCorresponding voltage value according to the optimal power value Pm，optThe result of the comparison of the corresponding voltage value Umax with the induced electromotive force Us generated by the motor determines whether to perform a step-up operation or a step-down operation, when the result of the comparison is Us<When Umax, executing boost operation, otherwise executing buck operation, according to the optimal power value Pm，optThe comparison result with the motor power value P at the present time controls the number of the boost circuits or the buck circuits that are turned on. Motor power value P at present moment<Optimum power value Pm，optAnd if not, keeping the number of the boost circuits or the buck circuits which are started at present unchanged, and further achieving the purpose of controlling the voltage of the direct current bus to change along with the change of the rotating speed value of the motor.
Example 3
The present embodiment provides a buck-boost control processor, configured to implement the buck-boost control method in the foregoing embodiment, where fig. 5 is a structural diagram of the buck-boost control processor according to the embodiment of the present invention, and as shown in fig. 5, the buck-boost control processor includes:
the determining module 10 is configured to determine an optimal power value according to the current motor load level; wherein, the corresponding relation between different motor load grades and the optimal power value is preset.
In a specific implementation, the motor may be a compressor, and when the motor is a compressor, the motor load level may be determined by a discharge speed Vw of the compressor, for example, when the discharge speed Vw of the compressor is 8m/s, 10m/s, or 12m/s, the motor load level corresponds to different optimal power values, respectively.
The adjusting module 20 is configured to adjust the number of started voltage boosting circuits or the number of started voltage dropping circuits according to the optimal power value and the current motor power value; the motor power value and the motor rotating speed have a corresponding relation.
The processor of the embodiment can adjust the number of the started voltage boosting circuits or the number of the started voltage reducing circuits according to the motor power value and the optimal power value at the current moment by acquiring the optimal power under different motor load levels, so that the bus voltage can be controlled to change along with the change of the motor rotating speed, and the motor operation efficiency is improved.
Fig. 6 is a block diagram of a buck-boost control processor according to another embodiment of the present invention, which needs to determine whether to perform a boost operation or a buck operation before adjusting the number of turn-on of a boost circuit or the number of turn-on of a buck circuit, and therefore, as shown in fig. 6, the buck-boost control processor further includes:
a step-up/step-down determining module 30, configured to determine whether to perform a step-up operation or a step-down operation, where the step-up/step-down determining module includes an obtaining unit 301, configured to obtain a voltage value corresponding to an optimal power value before adjusting the number of started step-up circuits or the number of step-down circuits according to the optimal power value and a current motor power value; a determining unit 302, configured to determine to perform a voltage boosting operation or a voltage dropping operation according to the voltage value corresponding to the optimal power value and the induced electromotive force generated by the motor at the current time. The obtaining unit 301 is specifically configured to determine a motor rotation speed value corresponding to the optimal power value based on a correspondence between the motor rotation speed value and the motor power value; and calculating a voltage value corresponding to the optimal power value according to the motor rotating speed value and the motor current value.
The determining unit 302 is specifically configured to: judging whether the induced electromotive force is smaller than a voltage value corresponding to the optimal power value; if so, determining to execute a boosting operation; if not, determining to execute the voltage reduction operation.
The adjusting module 20 includes: a first adjusting unit 201, configured to determine whether a motor power value at a current time is smaller than the optimal power value after determining that a boosting operation is performed; if so, indicating that the power value of the motor does not reach the optimal power value, and continuously increasing the number of the started booster circuits; if not, the motor power value is indicated to reach the optimal power value, and the number of the boost circuits which are started currently is kept.
The adjusting module 20 further includes: the second adjusting unit 202 is configured to determine whether the motor power value at the current time is smaller than the optimal power value after the step-down operation is determined to be performed; if so, indicating that the power value of the motor does not reach the optimal power value, and continuously increasing the number of the started voltage reduction circuits; if not, the power value of the motor is indicated to reach the optimal power value, and the number of the voltage reduction circuits which are started currently is kept.
As shown in fig. 3 mentioned above, the determining module 10 further includes, in order to obtain the optimal power value under the current motor load level, a correspondence relationship between different motor load levels and different optimal power values: a relationship obtaining unit 101, configured to obtain a correspondence between a motor rotation speed value and a motor power value at each motor load level; the relationship building unit 102 is configured to build a corresponding relationship between different motor load levels and an optimal power value according to the corresponding relationship between the motor speed value and the motor power value at each motor load level. Specifically, according to the corresponding relationship between the motor speed value and the motor power value under each motor load level, the corresponding relationship between different motor load levels and the optimal power value is established, which includes: determining scatter points by taking each motor load grade as an abscissa and taking the optimal power value corresponding to each motor load grade as an ordinate; and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
Example 4
The embodiment provides a relationship building method, fig. 7 is a flowchart of the relationship building method according to the embodiment of the present invention, and as shown in fig. 7, the method includes:
s201, acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load level.
S202, according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade, building the corresponding relation between different motor load grades and the optimal power value.
Specifically, according to the corresponding relationship between the motor speed value and the motor power value under each motor load level, the corresponding relationship between different motor load levels and the optimal power value is established, which includes: determining scatter points by taking each motor load grade as an abscissa and taking the optimal power value corresponding to each motor load grade as an ordinate; and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
According to the relation building method, the optimal power value under different motor load grades is obtained through the relation between the motor rotating speed and the motor power under different motor load grades, finally, the corresponding relation between the optimal motor rotating speed value and the motor power value is built through the relation, relatively accurate results are achieved for non-sampled points, the results are more rigorous, the bus voltage can accurately change along with the change of the motor rotating speed value, and therefore the motor operation efficiency is improved.
Example 5
This embodiment provides a relationship building processor, fig. 8 is a structural diagram of the relationship building processor according to the embodiment of the present invention, and as shown in fig. 8, the processor includes:
and the obtaining module 40 is configured to obtain a corresponding relationship between a motor speed value and a motor power value under each motor load level.
And the relation building module 50 is used for building the corresponding relation between different motor load grades and the optimal power value according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade. The relationship building module 50 is specifically configured to: determining scatter points by taking each motor load grade as an abscissa and taking the optimal power value corresponding to each motor load grade as an ordinate; and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
The relation building processor of the embodiment obtains the optimal power value under different motor load grades through the relation between the motor rotating speed and the motor power under different motor load grades, finally builds the corresponding relation between the optimal motor rotating speed value and the motor power value, achieves relatively accurate results for non-sampled points, enables the results to be more rigorous, enables the bus voltage to be more accurately changed along with the change of the motor rotating speed value, and accordingly improves the motor operation efficiency.
Example 6
The embodiment provides a compressor, which comprises a motor and a buck-boost control processor in the above embodiment, and is used for improving the operation efficiency of the motor. In other embodiments of the present invention, the compressor further comprises the above-mentioned relationship building processor.
Example 7
The embodiment provides an air conditioning unit, which comprises the compressor in the embodiment, and is used for improving the efficiency of a motor in the compressor.
Example 8
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the above-described buck-boost control method.
Example 9
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described relationship building method.
The above-described processor embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (17)

1. A buck-boost control method is applied to a power factor correction circuit, the power factor correction circuit comprises at least two paths of boost circuits and at least two paths of buck circuits, and the method is characterized by comprising the following steps:
determining an optimal power value according to the current motor load grade; the corresponding relation between different motor load grades and the optimal power value is preset;
adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the current motor power value; and the motor power value and the motor rotating speed have a corresponding relation.
2. The method of claim 1, wherein before adjusting the number of boost circuits or the number of buck circuits turned on based on the optimal power value and a current motor power value, the method further comprises:
determining to perform a boosting operation or a step-down operation;
if the step-up operation is determined to be executed, adjusting the number of the started step-up circuits according to the optimal power value and the motor power value at the current moment;
and if the step-down operation is determined to be executed, adjusting the number of started step-down circuits according to the optimal power value and the motor power value at the current moment.
3. The method of claim 2, wherein determining to perform a boost operation or a buck operation comprises:
acquiring a voltage value corresponding to the optimal power value;
and determining to execute a boosting operation or a voltage reduction operation according to the voltage value corresponding to the optimal power value and the induced electromotive force generated by the motor at the current moment.
4. The method of claim 3, wherein obtaining the voltage value corresponding to the optimal power value comprises:
determining a motor rotating speed value corresponding to the optimal power value based on the corresponding relation between the motor rotating speed value and the motor power value;
and calculating a voltage value corresponding to the optimal power value according to the motor rotating speed value and the motor current value.
5. The method according to claim 3, wherein determining to perform the step-up operation or the step-down operation according to the voltage value corresponding to the optimal power value and the induced electromotive force generated by the motor at the current moment comprises:
judging whether the induced electromotive force is smaller than a voltage value corresponding to the optimal power value;
if so, determining to execute a boosting operation;
if not, determining to execute the voltage reduction operation.
6. The method of claim 2, wherein adjusting the number of boost circuits that are turned on based on the optimal power value and the current motor power value comprises:
judging whether the power value of the motor at the current moment is smaller than the optimal power value;
if yes, increasing the number of the started booster circuits;
if not, the number of boost circuits currently on is maintained.
7. The method of claim 2, wherein adjusting the number of voltage reduction circuits that are turned on based on the optimal power value and the current motor power value comprises:
judging whether the power value of the motor at the current moment is smaller than the optimal power value;
if yes, increasing the number of the opened voltage reduction circuits;
if not, the number of the voltage reduction circuits which are currently started is kept.
8. The method according to claim 1, wherein the presetting of the corresponding relationship between different motor load levels and the optimal power value comprises:
acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade;
and according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade, building the corresponding relation between different motor load grades and the optimal power value.
9. A method of relationship building, the method comprising:
acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade;
and according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade, building the corresponding relation between different motor load grades and the optimal power value.
10. The method of claim 9, wherein the building of the correspondence between different motor load levels and the optimal power value according to the correspondence between the motor speed value and the motor power value under each motor load level comprises:
determining scatter points by taking each motor load grade as an abscissa and taking the optimal power value corresponding to each motor load grade as an ordinate;
and fitting the scattered points to obtain the corresponding relation between different motor load grades and the optimal power value.
11. A buck-boost control processor, the processor comprising:
the determining module is used for determining an optimal power value according to the current motor load level; the corresponding relation between different motor load grades and the optimal power value is preset;
the adjusting module is used for adjusting the number of started voltage boosting circuits or the number of started voltage reducing circuits according to the optimal power value and the motor power value at the current moment; and the motor power value and the motor rotating speed have a corresponding relation.
12. A relationship building processor, the processor comprising:
the acquisition module is used for acquiring the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade;
and the relation building module is used for building the corresponding relation between different motor load grades and the optimal power value according to the corresponding relation between the motor rotating speed value and the motor power value under each motor load grade.
13. A compressor comprising a motor, further comprising the buck-boost control processor of claim 11.
14. The compressor of claim 13, further comprising the relationship building processor of claim 12.
15. Air conditioning assembly characterized in that it comprises a compressor according to claim 13 or 14.
16. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 8.
17. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to claim 9 or 10.
CN202111100732.4A 2021-09-18 2021-09-18 Voltage boosting and reducing control method and processor, relationship building method and processor Pending CN113765383A (en)

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