CN116937960B - Voltage compensation method and system of inverter, electronic equipment and storage medium - Google Patents

Voltage compensation method and system of inverter, electronic equipment and storage medium Download PDF

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Publication number
CN116937960B
CN116937960B CN202311201359.0A CN202311201359A CN116937960B CN 116937960 B CN116937960 B CN 116937960B CN 202311201359 A CN202311201359 A CN 202311201359A CN 116937960 B CN116937960 B CN 116937960B
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voltage
inverter
current
power device
target
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CN116937960A (en
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陈锋
张伟
杜伟栋
魏念巍
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New United Group Co Ltd
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New United Group Co Ltd
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • 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
    • 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
    • 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
    • H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a voltage compensation method, a system, electronic equipment and a storage medium of an inverter, which relate to the field of inverters, and are used for determining a first voltage compensation amount and a second voltage compensation amount corresponding to the current of a power device and the current temperature of the power device flowing through the inverter, determining a target duty ratio through the current input voltage, the target voltage, the polarity of the current, the first voltage compensation amount and the second voltage compensation amount of the inverter, enabling the inverter to accurately output the required target voltage by utilizing the target duty ratio, comprehensively considering the voltage drop of a tube voltage of the power device and the voltage drop of a corresponding freewheeling diode to carry out voltage compensation on the output voltage of the inverter, and ensuring that the output voltage of the inverter can meet the requirements of users.

Description

Voltage compensation method and system of inverter, electronic equipment and storage medium
Technical Field
The present invention relates to the field of inverters, and in particular, to a voltage compensation method, a voltage compensation system, an electronic device, and a storage medium for an inverter.
Background
At present, the upper and lower tubes of the bridge arm of the voltage type three-phase inverter are usually in a complementary conduction mode, but because a certain dead time exists between the conduction of the upper and lower tubes of the bridge arm, and a tube voltage drop exists on the power device and the freewheel diode, a certain error still exists between the actual output voltage of the existing voltage type three-phase inverter and the required target voltage, and the error of the output voltage cannot be ignored in the low-voltage low-frequency high-current speed regulation control, so that the problem of how to perform voltage compensation on the output voltage of the inverter to ensure that the actual output voltage can reach the required target voltage is currently and urgently needed to be solved.
The prior art mainly aims to compensate dead time between an upper tube and a lower tube, and determines the compensation voltage for dead time compensation according to the direction of sampled phase current, but the prior art does not consider the influence of tube voltage reduction of a power device in an inverter, voltage drop of a freewheeling diode thereof and the like on output voltage, and voltage errors caused by the influence factors cannot be ignored when the output voltage is extremely low, so that the problems of output voltage distortion, inaccurate fundamental wave component, high harmonic content and the like are caused. In particular, when the inverter is applied to the low-speed and zero-speed driving and the low-voltage high-current driving, the output voltage of the inverter cannot meet the requirement, and the torque rotation speed of the driven motor is unstable.
Disclosure of Invention
The invention aims to provide a voltage compensation method, a system, electronic equipment and a storage medium of an inverter, which comprehensively consider the voltage drop of a power device and the voltage drop of a corresponding flywheel diode to carry out voltage compensation on the output voltage of the inverter, ensure that the output voltage of the inverter can meet the requirements of users, and particularly ensure that the output voltage of the inverter has good sine property, low harmonic content, low voltage regulation rate and obvious effect when the inverter is applied to the frequency-conversion speed regulation field with high requirements on the output voltage and high current and low frequency.
In order to solve the above technical problems, the present invention provides a voltage compensation method of an inverter, including:
acquiring the current input voltage of an inverter, the current of a power device flowing through the inverter and the current temperature of the power device;
determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, wherein the first voltage compensation amount is a tube voltage drop of the power device determined based on the current and the current temperature, and the second voltage compensation amount is a voltage drop of a freewheeling diode of the power device determined based on the current and the current temperature;
Determining a target duty cycle of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount;
and controlling the inverter to operate by using the target duty ratio so that the output voltage of the inverter is equal to the target voltage.
Optionally, the determining the first voltage compensation amount and the second voltage compensation amount of the output voltage of the inverter includes:
determining a first correspondence between a tube voltage drop of the power device and a current flowing through the power device of the inverter;
determining a second correspondence between a tube voltage drop of the power device and a temperature of the power device;
determining a current tube voltage drop of the power device based on the first corresponding relation, the second corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current tube voltage drop of the power device as a first voltage compensation quantity;
determining a third correspondence between a voltage drop of a freewheeling diode of the power device and a current flowing through a power device of the inverter;
Determining a fourth correspondence between a voltage drop of a freewheeling diode of the power device and a temperature of the power device;
and determining the current voltage drop of the flywheel diode of the power device based on the third corresponding relation, the fourth corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current voltage drop of the flywheel diode of the power device as a second voltage compensation quantity.
Optionally, before the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, the method further comprises:
DQ conversion is carried out on the current of the power device flowing through the inverter to obtain the direct current of the current;
receiving the direct current quantity output by the filter after filtering the sampling noise;
performing DQ inverse transformation on the direct current output by the filter to reconstruct the direct current into three-phase current;
and determining the polarity of the current based on the reconstructed three-phase current.
Optionally, before the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, the method further comprises:
Setting a preset interval in a zero crossing region of the current;
determining a weight compensation coefficient based on the current and the preset interval;
correspondingly, the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, includes:
a target duty cycle of the inverter is determined based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount.
Optionally, the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount includes:
determining a target duty cycle of the inverter according to a current input voltage, a target voltage, a polarity of the current, the weight compensation coefficient, the first voltage compensation amount, the second voltage compensation amount, and a target voltage-duty cycle formula of the inverter;
The target voltage-duty cycle formula is:
；
wherein,for the target voltage, +.>For the input voltage of the inverter, +.>For the first voltage compensation quantity, +.>For the second voltage compensation quantity, +.>For the weight compensation coefficient, +.>For the upper tube on time duty cycle of the target duty cycle,/for the upper tube on time duty cycle of the target duty cycle>A down tube on time duty cycle of the target duty cycle; i represents the current flowing through the power devices of the inverter.
Optionally, before the controlling the inverter to operate with the target duty ratio so that the output voltage of the inverter is equal to the target voltage, the method further includes:
determining an action delay of the power device based on the current and the current temperature;
determining a duty cycle compensation amount corresponding to the action delay of the power device;
and correcting the target duty ratio by using the duty ratio compensation amount.
Optionally, the duty cycle compensation amount is:
;
wherein,for the weight compensation coefficient, +.>For the preset dead time, +.>Delay for the operation of the power device, < >>Is the switching period of the inverter.
In order to solve the above technical problem, the present invention further provides a voltage compensation system of an inverter, including:
An acquisition unit configured to acquire a current input voltage of an inverter, a current flowing through a power device of the inverter, and a current temperature of the power device;
a voltage compensation unit configured to determine a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, the first voltage compensation amount being a tube voltage drop of the power device determined based on the present current and the present temperature, the second voltage compensation amount being a voltage drop of a freewheel diode of the power device determined based on the present current and the present temperature;
a target duty ratio determining unit configured to determine a target duty ratio of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount;
and an inverter control unit for controlling the inverter to operate using the target duty ratio so that an output voltage of the inverter is equal to the target voltage.
In order to solve the technical problem, the present invention further provides an electronic device, including:
a memory for storing a computer program;
a processor for implementing the steps of the voltage compensation method of the inverter as described above.
To solve the above technical problem, the present invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the voltage compensation method of an inverter as described above.
The invention provides a voltage compensation method of an inverter, which is characterized in that a first voltage compensation amount and a second voltage compensation amount corresponding to the current of a power device and the current temperature of the power device flowing through the inverter are determined, the first voltage compensation amount considers the influence of the pipe voltage drop of the power device on the output voltage of the inverter, the second voltage compensation amount considers the influence of the voltage drop of a follow current diode of the power device on the output voltage of the inverter, then the current input voltage, the target voltage, the polarity of the current, the first voltage compensation amount and the second voltage compensation amount of the inverter are used for determining a target duty ratio, so that the inverter can accurately output the required target voltage by utilizing the target duty ratio, the pipe voltage drop of the power device and the voltage drop of a corresponding follow current diode are comprehensively considered to perform voltage compensation on the output voltage of the inverter, the output voltage of the inverter can be ensured to meet the requirements of users, and particularly when the inverter is applied to the fields of low-voltage high-current, low-frequency and high-requirement variable-frequency speed regulation, the output voltage of the inverter can be enabled to have good sine property, low content and low-harmonic effect and remarkable voltage regulation effect.
The invention also provides a voltage compensation system, electronic equipment and a computer readable storage medium of the inverter, which have the same beneficial effects as the voltage compensation method of the inverter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a voltage compensation method of an inverter according to the present invention;
fig. 2 is a flow chart of another voltage compensation method of an inverter according to the present invention;
FIG. 3 is a schematic diagram of a test circuit according to the present invention when the current is a forward current;
FIG. 4 is a schematic diagram of a test circuit according to the present invention when the current is reverse current;
fig. 5 is a schematic structural diagram of an inverter according to the present invention;
fig. 6 is a schematic structural diagram of a voltage compensation system of an inverter according to the present invention;
Fig. 7 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
The invention provides a voltage compensation method, a system, electronic equipment and a storage medium of an inverter, which comprehensively consider the voltage drop of a power device and the voltage drop of a corresponding freewheeling diode to carry out voltage compensation on the output voltage of the inverter, ensure that the output voltage of the inverter can meet the requirements of users, and particularly ensure that the output voltage of the inverter has good sine property, low harmonic content, low voltage regulation rate and obvious effect when the inverter is applied to the frequency-conversion speed regulation field with high requirements on the output voltage and high current and low frequency.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The voltage compensation method of the inverter provided by the application can be applied to different types of inverters, particularly can be applied to a voltage type three-phase inverter, and the application is not particularly limited in specific implementation modes of the inverter and the like. Detailed description of the embodiments are described below.
Referring to fig. 1, fig. 1 is a flow chart of a voltage compensation method of an inverter according to the present application; in order to solve the above technical problems, the present application provides a voltage compensation method of an inverter, including:
s11: acquiring the current input voltage of an inverter, the current of a power device flowing through the inverter and the current temperature of the power device;
it is to be understood that the input voltage of the inverter is the input voltage of the dc side of the inverter, and the output voltage of the inverter is affected by the input voltage, so that the current input voltage of the inverter needs to be obtained first to determine the specific condition of the output voltage of the inverter; the current flowing through the power device of the inverter and the temperature of the power device have influence on the tube voltage drop of the power device and the voltage drop of the freewheeling diode thereof, so that the current flowing through the power device of the inverter and the current temperature of the power device need to be acquired firstly so as to accurately determine the first voltage compensation amount and the second voltage compensation amount subsequently, wherein the tube voltage drop of the power device represents the tube voltage drop of the power tube, and the current temperature of the power device is the current working temperature of the power device. The present application is not particularly limited herein with respect to a specific acquisition mode and the like, and a sensor may be employed as a sampling circuit to achieve acquisition of the current input voltage of the inverter, the current flowing through the power device of the inverter, and the current temperature of the power device.
S12: determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, wherein the first voltage compensation amount is a tube voltage drop of a power device determined based on the current and the current temperature, and the second voltage compensation amount is a voltage drop of a freewheeling diode of the power device determined based on the current and the current temperature;
in consideration of the fact that the influence of the tube voltage drop of the power device and the voltage drop of the free-wheeling diode of the power device on the output voltage of the inverter is not considered in the prior art, the tube voltage drop of the power device and the voltage drop of the free-wheeling diode of the power device corresponding to the current of the power device and the current temperature of the power device flowing through the inverter are determined, the tube voltage drop of the power device is used as a first voltage compensation quantity to conduct voltage compensation on the output voltage of the inverter, and the voltage drop of the free-wheeling diode of the power device is used as a second voltage compensation quantity to conduct voltage compensation on the output voltage of the inverter. The specific determination process and manner of the first voltage compensation amount and the second voltage compensation amount and the like are not particularly limited herein.
S13: determining a target duty cycle of the inverter based on a present input voltage, a target voltage, a polarity of a present current, a first voltage compensation amount, and a second voltage compensation amount of the inverter;
It will be appreciated that the present input voltage, the first voltage compensation amount, and the second voltage compensation amount of the inverter all have a certain influence on the output voltage of the inverter, and the duty ratio is determined differently when the polarities of the present currents are different, so that the output voltage of the inverter may accurately reach the target voltage, and the target duty ratio corresponding to the target voltage needs to be determined according to the present input voltage, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount of the inverter, and the specific process of the target duty ratio is not particularly limited herein.
S14: the inverter operation is controlled with the target duty ratio such that the output voltage of the inverter is equal to the target voltage.
It will be appreciated that when the inverter is operated based on a determined target duty cycle, the output voltage of the inverter is already the result of voltage compensation using the first voltage compensation amount and the second voltage compensation amount on the basis of the current input voltage, and the output voltage at this time has taken into account the influence of the tube voltage drop of the power device and the voltage drop of the freewheeling diode thereof, so that the required target voltage can be reached. The application is not particularly limited herein, as to how to control the operation of the inverter by using the target duty ratio, and the application can be implemented by using a PWM (Pulse Width Modulation ) modulation module or other types of driving modules to control the on and off of the power devices in the inverter, and when the power devices are controlled, the application is generally implemented by adopting a mode of outputting pulse signals.
In the scheme of the prior art, only dead time is compensated, on-off delay of a power device, voltage drop of a tube of a switching device, voltage drop of a freewheeling diode, voltage drop on an output loop busbar and the like are not considered, the voltage error cannot be ignored when the output voltage is extremely low, output voltage distortion can be caused, and fundamental wave component inaccuracy and harmonic content are high. In particular, in low-speed and zero-speed driving applications and low-voltage high-current driving applications, the output voltage cannot meet the requirements, and the torque rotation speed is unstable. The invention provides a voltage compensation method based on an inverter model aiming at the problem of error of output voltage of a voltage type three-phase inverter, which comprehensively considers factors such as dead zone, action delay of a power device, tube voltage reduction of a switching device, voltage reduction of a freewheeling diode, busbar voltage reduction and the like, and realizes accurate compensation of the output voltage.
The voltage compensation method of the inverter provided by the invention considers the factors such as dead time, action delay of the power device, tube voltage reduction of the power device and voltage reduction of a follow current diode thereof when compensating the output voltage of the voltage type inverter; the influence of the temperature of the power device and the flowing current on the action delay of the power device, the voltage drop of the tube and the voltage drop of the freewheel diode is considered; the temperature of the power device and the effect of the current flowing through the power device on the voltage compensation process of the voltage-type inverter can be tested and fitted by design tests when determining the first voltage compensation amount and the second voltage compensation amount. The method comprehensively considers the action delay of the power tube and the voltage drop of the switching device and the voltage drop of the freewheeling diode under various conditions to carry out fine compensation on the output voltage, is applied to the fields of low-voltage high-current, low-frequency and variable-frequency speed regulation with high requirements on the output voltage, and has the advantages of good output voltage sine, low harmonic content, low voltage regulation rate and obvious effect.
The invention provides a voltage compensation method of an inverter, which is characterized in that a first voltage compensation amount and a second voltage compensation amount corresponding to the current of a power device and the current temperature of the power device flowing through the inverter are determined, the first voltage compensation amount considers the influence of the pipe voltage drop of the power device on the output voltage of the inverter, the second voltage compensation amount considers the influence of the voltage drop of a follow current diode of the power device on the output voltage of the inverter, then the current input voltage, the target voltage, the polarity of the current, the first voltage compensation amount and the second voltage compensation amount of the inverter are used for determining a target duty ratio, so that the inverter can accurately output the required target voltage by utilizing the target duty ratio, the pipe voltage drop of the power device and the voltage drop of a corresponding follow current diode are comprehensively considered to perform voltage compensation on the output voltage of the inverter, the output voltage of the inverter can be ensured to meet the requirements of users, and particularly when the inverter is applied to the fields of low-voltage high-current, low-frequency and high-requirement variable-frequency speed regulation, the output voltage of the inverter can be enabled to have good sine property, low content and low-harmonic effect and remarkable voltage regulation effect.
Referring to fig. 2, fig. 2 is a flow chart of another voltage compensation method of an inverter according to the present invention; referring to fig. 3, fig. 3 is a schematic structural diagram of a test circuit provided by the present invention when the current is a forward current; referring to fig. 4, fig. 4 is a schematic structural diagram of a test circuit provided by the present invention when the current is a reverse current; referring to fig. 5, fig. 5 is a schematic structural diagram of an inverter according to the present invention; Q1-Q6 in FIG. 5 represent 6 power devices, D1-D6 represent freewheeling diodes corresponding to the power devices, V DC For the input voltage of the inverter, I out The output current of the inverter is equal to the current flowing through the power device of the inverter, V out Is the output voltage of the inverter; in fig. 5, the first terminal of the power device Q1, the first terminal of the power device Q3, the first terminal of the power device Q5, the negative electrode of the triode D1, the negative electrode of the triode D3, threeThe negative electrode of the polar tube D5 is respectively connected with one end of the input voltage of the inverter, the first end of the power device Q2, the first end of the power device Q4, the first end of the power device Q6, the positive electrode of the triode D2, the positive electrode of the triode D4 and the positive electrode of the triode D6 are respectively connected with the other end of the input voltage of the inverter, the second end of the power device Q1, the second end of the power device Q2, the positive electrode of the triode D1 and the negative electrode of the triode D2 are connected together and output as a first phase of the inverter, the second end of the power device Q3, the second end of the power device Q4, the positive electrode of the triode D3 and the negative electrode of the triode D4 are connected together and output as a second phase of the inverter, the second end of the power device Q5, the positive electrode of the triode D5 and the negative electrode of the triode D6 are connected together and output as a third phase of the inverter; based on the above embodiments:
As an alternative embodiment, determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of an inverter includes:
determining a first correspondence between a voltage drop of the power device and a current flowing through the power device of the inverter;
determining a second correspondence between a tube voltage drop of the power device and a temperature of the power device;
determining the current tube voltage drop of the power device based on the first corresponding relation, the second corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current tube voltage drop of the power device as a first voltage compensation quantity;
determining a third correspondence between a voltage drop of a freewheeling diode of the power device and a current flowing through the power device of the inverter;
determining a fourth correspondence between a voltage drop of a freewheeling diode of the power device and a temperature of the power device;
and determining the current voltage drop of the freewheeling diode of the power device based on the third corresponding relation, the fourth corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current voltage drop of the freewheeling diode of the power device as a second voltage compensation amount.
In consideration of the fact that the tube voltage drop of the power device and the voltage drop of the flywheel diode are different when the current flowing through the power device and/or the temperature of the power device of the inverter are different, in determining the first voltage compensation amount and the second voltage compensation amount, it is necessary to implement accurate determination of the first voltage compensation amount and the second voltage compensation amount according to a first correspondence relationship and a second correspondence relationship between the current flowing through the power device of the inverter and the temperature of the power device and the tube voltage drop of the power device, and a third correspondence relationship and a fourth correspondence relationship between the current flowing through the power device of the inverter and the temperature of the power device and the voltage drop of the flywheel diode, which are determined in advance. The specific implementation modes of the first corresponding relation, the second corresponding relation, the third corresponding relation and the fourth corresponding relation and the like are not particularly limited, the method can be realized in a mode of fitting linear coefficients, and can also be realized by making a relation table, and meanwhile, in the process of determining each corresponding relation, the voltage drop existing in the power loop busbar and the connection point is directly taken into consideration, so that the obtained first voltage compensation quantity and second voltage compensation quantity are the results of considering the voltage drop of the tube of the power device and the voltage drop of the flywheel diode and also comprise the influence of the voltage drop existing in the power loop busbar and the connection point in the process of determining the first voltage compensation quantity and the second compensation quantity according to each corresponding relation.
As a specific example, two test circuits as shown in fig. 3 and 4 are used to test in the case of current I forward and current I reverse, respectively, I being a current sensor for sampling current I, v being a voltage sensor for sampling the output voltage U of the inverter out . One end c of the upper tube of the inverter in fig. 3 and the positive electrode U of the input voltage of the inverter DC One end e of the lower tube is connected with the negative electrode U of the input voltage of the inverter DC The control end g of the upper pipe is connected with a first control signal, the control end g of the lower pipe is connected with a second control signal, the other end e of the upper pipe and the other end c of the lower pipe are connected together and are connected with the input end of a current sensor i, and the output end of the current sensor i is connected with the first output end of the inverterThe resistor R1 is connected with the inductor L1 in series, one end of the circuit after the series connection is connected with the first output end of the inverter, the other end of the circuit is respectively connected with the e end of the lower tube and the second output end of the inverter, and the two output ends of the inverter are respectively connected with the two input ends of the voltage sensor. I>When 0, as shown in fig. 3, the lower tube of the inverter is blocked, that is, the second control signal is set to 0, and the output voltage of the inverter under different currents and temperatures is tested by giving different Duty ratios duty_h to the upper tube, that is, by adjusting the first control signal; one end c of the upper tube of the inverter and the positive electrode U of the input voltage of the inverter in FIG. 4 DC One end e of the lower tube is connected with the negative electrode U of the input voltage of the inverter DC The control end g of the upper tube is connected with a first control signal, the control end g of the lower tube is connected with a second control signal, the other end e of the upper tube and the other end c of the lower tube are connected together and are connected with the input end of a current sensor i, the output end of the current sensor i is connected with the first output end of an inverter, a resistor R1 is connected with an inductor L1 in series, one end of a circuit after the series connection is connected with the c end of the upper tube, the other end of the circuit is respectively connected with the output end of the current sensor i and the first output end of the inverter, the e end of the lower tube is connected with the second output end of the inverter, and the two output ends of the inverter are respectively connected with the two input ends of a voltage sensor. I<When 0, as shown in fig. 4, the upper tube of the inverter is blocked, i.e. the first control signal is set to 0, and the output voltage of the inverter under different currents and temperatures is tested by giving different Duty ratios duty_l to the lower tube, i.e. by adjusting the second control signal; fitting compensation coefficients K (delay, I), K (delay, T), K (U) according to the obtained test data of current, temperature, output voltage and the like C ，I）、K（U C ，T）、K（U D ，I）、K（U D T) or a table of the relation between the current, the temperature and the first and second voltage compensation amounts. K (U) C I) is a linear coefficient representing the correspondence between the tube voltage drop and the current of the switching device, K (U) C T) is a linear coefficient representing the correspondence between the tube buck and the temperature of the switching device, K (U) D I) is represented as a free-wheeling diodeA linear coefficient of the correspondence between voltage drop and current, K (U D T) is a linear coefficient representing the correspondence between the voltage drop of the freewheel diode and the temperature; k (delay, I) is a linear coefficient representing the corresponding relation between the action delay and the current of the power device, K (delay, T) is a linear coefficient representing the corresponding relation between the action delay and the temperature of the power device, wherein U C Tube step-down, U, representing a power device D The voltage drop of the flywheel diode is represented, delay represents the action delay of the power device, I represents the current flowing through the power device, and T represents the temperature of the power device.
Specifically, the first corresponding relation, the second corresponding relation, the third corresponding relation and the fourth corresponding relation obtained through induction fitting are used for rapidly and accurately finding the first voltage compensation amount and the second voltage compensation amount corresponding to the current of the power device flowing through the inverter and the current temperature of the power device, time is saved, working efficiency is improved, corresponding test fitting processes can be carried out according to different circuit conditions of the inverter in practical application by the corresponding relations, accuracy of the first voltage compensation amount and the second voltage compensation amount is guaranteed, flexibility is high, and application range of the whole voltage compensation method is further expanded.
As an alternative embodiment, before determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, further comprising:
DQ conversion is carried out on the current flowing through the power device of the inverter to obtain the direct current of the current;
receiving the direct current quantity output by the filter after filtering the sampling noise;
performing DQ inverse transformation on the direct current output by the filter to reconstruct the direct current into three-phase current;
the polarity of the present current is determined based on the reconstructed three-phase current.
It is easy to understand that the current flowing through the power device of the inverter is three-phase current, in the process of obtaining the current flowing through the power device of the inverter, the precision of the sampling device adopted may be lower, at this time, current sampling noise exists in the obtained current flowing through the power device of the inverter, and due to the existence of the current sampling noise, the current zero crossing judgment is inaccurate, that is, a certain error exists in the judgment of the polarity of the current, and erroneous voltage compensation may be caused, so that the output voltage is worse; in general, the voltage compensation amount for the output voltage needs to be reduced as the current approaches zero. In order to improve accuracy of current polarity judgment, DQ conversion can be carried out on the sampled three-phase current under a synchronous rotation coordinate system, the converted direct current is input into a filter to carry out low-pass filtering to filter sampling noise, then DQ inverse conversion is carried out to reconstruct the three-phase current, and then polarity judgment is carried out according to the reconstructed three-phase current, and corresponding compensation is calculated. The present application is not limited to a specific manner of how to reduce current sampling noise, and this embodiment is only a specific implementation manner.
Specifically, the obtained current flowing through the power device of the inverter is subjected to DQ conversion, is further filtered and is then reconstructed into three-phase current, so that the clean noise-reducing fundamental frequency current can be obtained, the accuracy of a judgment result of judging the current polarity is improved, and the accuracy and the reliability of the whole voltage compensation process are further improved.
As an alternative embodiment, before determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, further comprising:
setting a preset interval in a zero crossing region of the current;
determining a weight compensation coefficient based on the current and a preset interval;
correspondingly, determining the target duty cycle of the inverter based on the present input voltage, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount of the inverter, includes:
the target duty cycle of the inverter is determined based on the present input voltage, the target voltage, the polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount of the inverter.
In order to reduce the influence of erroneous compensation which may exist in the current zero-crossing section, a [ -i_thd, i_thd ] current section is set as a preset section in which the weight compensation coefficient k_com linearly decreases according to the current magnitude, and the weight compensation coefficient is at most 1.0 and at least 0, that is, linear compensation is employed in the preset section and fixed value compensation is employed outside the preset section. The weight compensation coefficient is:
；
Wherein,as the weight compensation coefficient, I represents the current flowing through the power device of the inverter; i_thd is a preset current value determined according to the sampling noise level of the current, in the process of acquiring the current I, the smaller the precision of the sampling device is, the larger the noise level of the sampled current is, the larger the range of the preset interval is, the error of a voltage compensation result caused by error compensation of the current zero crossing interval can be further reduced, the specific value and the selection mode of the preset current value are not particularly limited, and the target duty ratio is further determined by using the weight compensation parameter after the weight compensation parameter is set, so that the error caused by error compensation of the current zero crossing interval is avoided.
Specifically, the weight compensation coefficient is added to avoid errors caused by error compensation of the current zero crossing interval, the accuracy of the whole voltage compensation process is further improved, and the finally determined target duty ratio is further corrected by using the weight compensation parameter, so that the accuracy and the reliability of the whole voltage compensation process are determined.
As an alternative embodiment, determining the target duty cycle of the inverter based on the present input voltage, the target voltage, the polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount of the inverter includes:
Determining a target duty ratio of the inverter according to the current input voltage, the target voltage, the polarity of the current, the weight compensation coefficient, the first voltage compensation amount, the second voltage compensation amount and the target voltage-duty ratio formula of the inverter;
the target voltage-duty cycle formula is:
；
wherein,for the target voltage +.>For the input voltage of the inverter, < >>For the first voltage compensation quantity,/for>For the second voltage compensation quantity,/for>For the weight compensation coefficient, +.>On time duty cycle for upper tube in target duty cycle, +.>The switching-on time duty cycle of the lower tube in the target duty cycle; i represents the current flowing through the power devices of the inverter.
It will be appreciated that when the switching frequency of the inverter is much greater than the fundamental frequency of the target output ac voltage, the output voltage during the inverter switching period is equivalent to an average value. The output voltage of the inverter is divided into three parts, including the output voltage of the inverter when the upper tube is opened and the output of the inverter in dead timeVoltage and output voltage of inverter when down tube is on, so average value U of output voltage of inverter out =U H +U death +U L The method comprises the steps of carrying out a first treatment on the surface of the Wherein U is H Is the average output voltage of the inverter when the upper tube is opened, U death Is the output voltage of the inverter in dead time, U L Is the output voltage of the inverter when the down tube is turned on.
It can be appreciated that the influence of the power device on the output voltage is mainly reflected in the tube voltage reduction U of the power device C And voltage drop U of freewheel diode D Meanwhile, voltage drops exist in the power circuit busbar and the connection point, and each voltage drop is related to the temperature of the power device and the current flowing through the power device; when the first voltage compensation amount and the second voltage compensation amount are determined by adopting a mode of fitting linear coefficients, U can be defined after comprehensive consideration C =K（U C ，I）*I+K（U C ，T）*T，U D =K（U D ，I）*I+K（U D T) T; wherein I represents the current flowing through the power device, T represents the temperature of the power device, K (U C I) is a linear coefficient fitted in advance representing the correspondence between the tube buck and the current of the switching device, K (U) C T) is a linear coefficient fitted in advance representing the correspondence between the tube buck and the temperature of the switching device, K (U) D I) is a linear coefficient fitted in advance representing the correspondence between the voltage drop and current of the freewheeling diode, K (U) D T) is a linear coefficient fitted in advance representing the correspondence between the voltage drop and the temperature of the freewheeling diode; it will be appreciated that U C Namely the first voltage compensation quantity, U D The second voltage compensation amount is the second voltage compensation amount, and in the process of fitting the linear coefficient, the voltage drop existing in the power loop busbar and the connecting point can be taken into consideration, so that the accuracy of the first voltage compensation amount and the second voltage compensation amount is further improved. Meanwhile, the action delay of the power device is considered to influence the target duty ratio, the action delay of the power device comprises the logic delay of a driving signal and the execution delay of the power device, and the execution delay of the power device is related to the current temperature and the flowing current of the power device Therefore, the time t_delay=k (delay, I) ×i+k (delay, T) ×t, K (delay, I) defining the compensation required for the action delay of the power device may be further increased, where K (delay, I) is a linear coefficient representing the correspondence between the action delay of the power device and the current fitted in advance, and K (delay, T) is a linear coefficient representing the correspondence between the action delay of the power device and the temperature fitted in advance.
Specifically, by the above-defined 6 linear coefficients related to the operating temperature and the flowing current of the power device, it is possible to compensate for the action delay of the power device, the tube voltage drop of the switching device, and the voltage drop of the freewheel diode, thereby realizing voltage compensation for the output voltage of the inverter.
The actual output voltage of the inverter needs to be discussed according to the direction of the output current, the current direction flowing out of the inverter is defined as forward current, when I > 0:
；
when I < 0:
；
and the sum of the three times is the switching period of the inverter, so duty_h+duty_d+duty_l=1.0; meanwhile, considering the influence of the weight compensation coefficient on the output voltage of the inverter, the formula is organized to obtain:
；
at this time, the target voltage may be substituted into U out Obtaining the upper tube opening time duty ratio corresponding to the target voltage after the first voltage compensation and the second voltage compensation are performed and the weight compensation coefficient is considered And a down tube on time duty cycle +.>Thereby obtaining a target duty cycle.
Specifically, when the first voltage compensation amount and the second voltage compensation amount are determined by adopting a fitting linear coefficient mode, the first voltage compensation amount and the second voltage compensation amount can be represented according to each linear coefficient preset in advance, and a relation between a final target voltage and a duty ratio, an input voltage, the first voltage compensation amount, the second voltage compensation amount and a weight compensation parameter is obtained, so that the target duty ratio corresponding to the target voltage is accurately determined, and the voltage compensation of the inverter is realized.
As an alternative embodiment, before controlling the operation of the inverter with the target duty cycle to make the output voltage of the inverter equal to the target voltage, the method further includes:
determining the action delay of the power device based on the current and the current temperature;
determining a duty cycle compensation amount corresponding to the action delay of the power device;
and correcting the target duty ratio by using the duty ratio compensation amount.
Considering that the action delay of the power device has a certain influence on the target duty cycle, the action delay of the current corresponding power device can be determined by utilizing the current and the current temperature, so that the duty cycle compensation quantity corresponding to the action delay of the current power device is determined, and then the target duty cycle is further corrected; the determining process of the action delay of the power device may be determined directly by using the time t_delay=k (delay, I) x i+k (delay, T) x T of the compensation required by the action delay of the power device defined in the previous embodiment, or may be determined by defining two corresponding relations between the action delay of the power device and the current and temperature, the specific determining mode of the action delay of the power device is not particularly limited herein, the duty cycle compensation amount corresponding to the action delay of the power device may be further determined by parameters such as the switching period of the inverter, and the corresponding relation between the action delay of the power device and the duty cycle compensation amount is not particularly limited herein; after the duty cycle compensation amount is determined, the duty cycle of the target can be directly added with the duty cycle compensation amount to obtain the corrected target duty cycle, and it is easy to understand that the inverter needs to be controlled to work based on the corrected target duty cycle in the follow-up process to further reduce the error between the output voltage of the inverter and the target voltage.
Specifically, considering that the action delay of the power device also has a certain influence on the target duty cycle, the target duty cycle is further compensated and corrected based on the action delay of the power device, so that the accuracy of the target duty cycle is improved, and the accuracy and the reliability of the whole voltage compensation process are further ensured.
As an alternative embodiment, the duty cycle compensation amount is:
;
wherein,for the weight compensation coefficient, +.>For the preset dead time, +.>For the action delay of the power device +.>Is the switching period of the inverter.
It is not easy to understand that in the process of correcting the target duty ratio by using the duty ratio compensation amount, not only the influence of the action delay of the power device on the duty ratio is considered, but also the influence of the dead time on the corresponding duty ratio is considered, so that the duty ratio compensation amount not only depends on the action delay of the power device, but also is related to the switching period of the inverter and the preset dead time determined according to the application requirement, and meanwhile, the weight compensation coefficient can be used as an influence factor of the duty ratio compensation amount, so that the accuracy of the duty ratio compensation amount is further improved. The specific values of the switching period and the preset dead time of the inverter are not particularly limited herein, and may be selected and adjusted according to the requirements of the user in application.
Specifically, the duty cycle compensation amount is calculated by using the action delay of the power device, the switching period of the inverter, the preset dead time and the weight compensation coefficient, the duty cycle compensation is further considered to be set according to the action delay of the switching device and the preset dead time, the user requirement is further considered, the accuracy of the obtained target duty cycle is improved, and the accuracy and the reliability of the whole voltage compensation process are ensured.
As a specific embodiment, taking fig. 2 as an example, uout_ref is a target voltage, U DC The input voltage of the inverter is I is the current flowing through a power device of the inverter, and T is the temperature of the power device; firstly reconstructing sampled three-phase current by DQ conversion, and then determining a first voltage compensation quantity U according to the current I and the temperature T C And a second voltage compensation amount U D Meanwhile, the action delay T_delay and the weight compensation coefficient K_com of the power device can be determined, then the required target duty ratio is determined according to the polarity of the current, and after the target duty ratio is further compensated and corrected by using the duty ratio compensation quantity, the PWM modulation module is controlled to control the work of the inverter according to the corrected target duty ratio.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a voltage compensation system of an inverter according to the present invention; in order to solve the above technical problem, the present invention further provides a voltage compensation system of an inverter, including:
An acquisition unit 31 for acquiring a present input voltage of the inverter, a present current flowing through a power device of the inverter, and a present temperature of the power device;
a voltage compensation unit 32 for determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, the first voltage compensation amount being a tube voltage drop of the power device determined based on the present current and the present temperature, the second voltage compensation amount being a voltage drop of a freewheel diode of the power device determined based on the present current and the present temperature;
a target duty ratio determining unit 33 for determining a target duty ratio of the inverter based on the present input voltage, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount of the inverter;
an inverter control unit 34 for controlling the inverter to operate with a target duty ratio so that the output voltage of the inverter is equal to the target voltage.
As an alternative embodiment, the voltage compensation unit 32 includes:
a first correspondence determining unit configured to determine a first correspondence between a tube voltage drop of the power device and a current flowing through the power device of the inverter;
a second correspondence determining unit, configured to determine a second correspondence between a tube voltage drop of the power device and a temperature of the power device;
A first voltage compensation amount determining unit, configured to determine a current pipe voltage drop of the power device based on the first correspondence, the second correspondence, a current of the power device flowing through the inverter, and a current temperature of the power device, and take the current pipe voltage drop of the power device as a first voltage compensation amount;
a third correspondence determining unit configured to determine a third correspondence between a voltage drop of a flywheel diode of the power device and a current flowing through the power device of the inverter;
a fourth correspondence determining unit configured to determine a fourth correspondence between a voltage drop of a flywheel diode of the power device and a temperature of the power device;
the first voltage compensation amount determining unit is used for determining the current voltage drop of the flywheel diode of the power device based on the third corresponding relation, the fourth corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current voltage drop of the flywheel diode of the power device as the second voltage compensation amount.
As an alternative embodiment, further comprising:
the conversion unit is used for performing DQ conversion on the current of the power device flowing through the inverter to obtain the direct current of the current;
The filtering unit is used for receiving the direct current quantity output by the filter after filtering the sampling noise;
the reconstruction unit is used for performing DQ inverse transformation on the direct current output by the filter so as to reconstruct the direct current into three-phase current;
and a polarity determining unit for determining the polarity of the present current based on the reconstructed three-phase current.
As an alternative embodiment, further comprising:
the interval setting unit is used for setting a preset interval in a zero crossing region of the current;
the weight compensation coefficient determining unit is used for determining a weight compensation coefficient based on the current and a preset interval;
correspondingly, the target duty ratio determining unit 33 includes:
and a target duty ratio compensation unit for determining a target duty ratio of the inverter based on the present input voltage, the target voltage, the polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount of the inverter.
As an alternative embodiment, the target duty cycle compensation unit comprises:
and the target duty ratio compensation subunit determines the target duty ratio of the inverter according to the current input voltage, the target voltage, the polarity of the current, the weight compensation coefficient, the first voltage compensation amount, the second voltage compensation amount and the target voltage-duty ratio formula of the inverter.
As an alternative embodiment, further comprising:
the action delay determining unit is used for determining the action delay of the power device based on the current and the current temperature;
a duty cycle compensation amount determining unit for determining a duty cycle compensation amount corresponding to an action delay of the power device;
and the target duty ratio correction unit is used for correcting the target duty ratio by using the duty ratio compensation quantity.
For the description of the voltage compensation system of the inverter provided by the present invention, please refer to the embodiment of the voltage compensation method of the inverter, and the description of the present invention is omitted herein.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to the present invention. In order to solve the technical problem, the present invention further provides an electronic device, including:
a memory 21 for storing a computer program;
a processor 22 for implementing the steps of the voltage compensation method of the inverter as described above.
Processor 22 may include one or more processing cores, such as a 4-core processor, an 8-core processor, or the like, among others. The processor 22 may be implemented in at least one hardware form of a DSP (Digital Signal Processor ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor 22 may also include a main processor, which is a processor for processing data in an awake state, also called a central processor, and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 22 may integrate a GPU (graphics processing unit, graphics processor) for taking care of rendering and drawing of content that the display screen is required to display. In some embodiments, the processor 22 may also include an AI (Artificial Intelligence ) processor for processing computing operations related to machine learning.
Memory 21 may include one or more computer-readable storage media, which may be non-transitory. Memory 21 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 21 is at least used for storing a computer program, where the computer program, when loaded and executed by the processor 22, can implement the relevant steps of the voltage compensation method of the inverter disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 21 may also include an operating system, data, and the like, and the storage manner may be transient storage or permanent storage. The operating system may include Windows, unix, linux, among others. The data may include, but is not limited to, data of a voltage compensation method of the inverter, and the like.
In some embodiments, the electronic device may further include a display screen, an input-output interface, a communication interface, a power supply, and a communication bus.
It will be appreciated by those skilled in the art that the structure shown in fig. 7 is not limiting of the electronic device and may include more or fewer components than shown.
For the description of the electronic device provided by the present application, reference is made to the embodiment of the voltage compensation method of the inverter, and the description of the embodiment is omitted herein.
To solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the voltage compensation method of the inverter as described above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium for performing all or part of the steps of the method according to the embodiments of the present application. In particular, the computer readable storage medium may include, but is not limited to, any type of disk including floppy disks, optical disks, and removable hard disks, etc., or any type of medium or device suitable for storing instructions, data, etc., the application is not limited in particular herein.
For an introduction of a computer readable storage medium provided by the present invention, please refer to an embodiment of the voltage compensation method of the inverter, and the disclosure is not repeated herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A voltage compensation method of an inverter, comprising:
acquiring the current input voltage of an inverter, the current of a power device flowing through the inverter and the current temperature of the power device;
Determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, wherein the first voltage compensation amount is a tube voltage drop of the power device determined based on the current and the current temperature, and the second voltage compensation amount is a voltage drop of a freewheeling diode of the power device determined based on the current and the current temperature;
determining a target duty cycle of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount;
controlling the inverter to operate using the target duty ratio so that an output voltage of the inverter is equal to the target voltage;
before the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, further includes:
setting a preset interval in a zero crossing region of the current;
determining a weight compensation coefficient based on the current and the preset interval;
correspondingly, the determining the target duty cycle of the inverter based on the present input voltage of the inverter, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount, includes:
Determining a target duty cycle of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount;
the determining a target duty cycle of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount, includes:
determining a target duty cycle of the inverter according to a current input voltage, a target voltage, a polarity of the current, the weight compensation coefficient, the first voltage compensation amount, the second voltage compensation amount, and a target voltage-duty cycle formula of the inverter;
the target voltage-duty cycle formula is:
；
wherein,for the target voltage, +.>For the input voltage of the inverter, +.>For the first voltage compensation quantity, +.>For the second voltage compensation quantity, +.>For the weight compensation coefficient, +.>For the upper tube on time duty cycle of the target duty cycle,/for the upper tube on time duty cycle of the target duty cycle>A down tube on time duty cycle of the target duty cycle; i represents the current flowing through the power devices of the inverter.
2. The voltage compensation method of an inverter according to claim 1, wherein the determining a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter includes:
determining a first correspondence between a tube voltage drop of the power device and a current flowing through the power device of the inverter;
determining a second correspondence between a tube voltage drop of the power device and a temperature of the power device;
determining a current tube voltage drop of the power device based on the first corresponding relation, the second corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current tube voltage drop of the power device as a first voltage compensation quantity;
determining a third correspondence between a voltage drop of a freewheeling diode of the power device and a current flowing through a power device of the inverter;
determining a fourth correspondence between a voltage drop of a freewheeling diode of the power device and a temperature of the power device;
and determining the current voltage drop of the flywheel diode of the power device based on the third corresponding relation, the fourth corresponding relation, the current of the power device flowing through the inverter and the current temperature of the power device, and taking the current voltage drop of the flywheel diode of the power device as a second voltage compensation quantity.
3. The method of voltage compensation of an inverter according to claim 1, wherein before the determining the target duty cycle of the inverter based on the present input voltage, the target voltage, the polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount of the inverter, further comprises:
DQ conversion is carried out on the current of the power device flowing through the inverter to obtain the direct current of the current;
receiving the direct current quantity output by the filter after filtering the sampling noise;
performing DQ inverse transformation on the direct current output by the filter to reconstruct the direct current into three-phase current;
and determining the polarity of the current based on the reconstructed three-phase current.
4. The method of voltage compensation of an inverter according to claim 1, wherein before controlling the inverter to operate with the target duty ratio so that the output voltage of the inverter is equal to the target voltage, further comprising:
determining an action delay of the power device based on the current and the current temperature;
determining a duty cycle compensation amount corresponding to the action delay of the power device;
and correcting the target duty ratio by using the duty ratio compensation amount.
5. The voltage compensation method of an inverter according to claim 4, wherein the duty compensation amount is:
;
wherein,for the weight compensation coefficient, +.>For the preset dead time, +.>Delay for the operation of the power device, < >>Is the switching period of the inverter.
6. A voltage compensation system for an inverter, comprising:
an acquisition unit configured to acquire a current input voltage of an inverter, a current flowing through a power device of the inverter, and a current temperature of the power device;
a voltage compensation unit configured to determine a first voltage compensation amount and a second voltage compensation amount of an output voltage of the inverter, the first voltage compensation amount being a tube voltage drop of the power device determined based on the present current and the present temperature, the second voltage compensation amount being a voltage drop of a freewheel diode of the power device determined based on the present current and the present temperature;
a target duty ratio determining unit configured to determine a target duty ratio of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the first voltage compensation amount, and the second voltage compensation amount;
An inverter control unit for controlling the inverter to operate using the target duty ratio so that an output voltage of the inverter is equal to the target voltage;
further comprises:
the interval setting unit is used for setting a preset interval in the zero crossing region of the current;
a weight compensation coefficient determining unit for determining a weight compensation coefficient based on the current and the preset interval;
correspondingly, the target duty ratio determining unit includes:
a target duty ratio compensation unit for determining a target duty ratio of the inverter based on a present input voltage of the inverter, a target voltage, a polarity of the present current, the weight compensation coefficient, the first voltage compensation amount, and the second voltage compensation amount;
the target duty compensation unit includes:
a target duty cycle compensation subunit, configured to determine a target duty cycle of the inverter according to a current input voltage, a target voltage, a polarity of the current, the weight compensation coefficient, the first voltage compensation amount, the second voltage compensation amount, and a target voltage-duty cycle formula of the inverter;
the target voltage-duty cycle formula is:
；
Wherein,for the target voltage, +.>For the input voltage of the inverter, +.>For the first voltage compensation quantity, +.>For the second voltage compensation quantity, +.>For the weight compensation coefficient, +.>For the upper tube on time duty cycle of the target duty cycle,/for the upper tube on time duty cycle of the target duty cycle>A down tube on time duty cycle of the target duty cycle; i represents the current flowing through the power devices of the inverter.
7. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the voltage compensation method of an inverter according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the voltage compensation method of an inverter according to any of claims 1 to 5.
CN202311201359.0A 2023-09-18 2023-09-18 Voltage compensation method and system of inverter, electronic equipment and storage medium Active CN116937960B (en)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6417736B1 (en) * 2000-11-01 2002-07-09 Lewyn Consulting, Inc. Multiple-voltage supply power amplifier with dynamic headroom control
CN103236798A (en) * 2013-04-26 2013-08-07 北方工业大学 Three-level inverter dead time compensation control method
US10250161B1 (en) * 2018-04-05 2019-04-02 Rockwell Automation Technologies, Inc. Adaptive harmonic elimination compensation for voltage distortion elements
CN110932584A (en) * 2019-12-05 2020-03-27 深圳市汇川技术股份有限公司 Inverter nonlinear compensation method, system, device and storage medium
CN110971134A (en) * 2019-12-19 2020-04-07 南京微盟电子有限公司 Rectifier diode voltage drop compensation system of non-isolated switch power supply
CN111224537A (en) * 2020-02-25 2020-06-02 苏州灵猴机器人有限公司 Inverter dead zone compensation method based on phase current
CN111884546A (en) * 2020-08-06 2020-11-03 武汉久同智能科技有限公司 Low-voltage large-current alternating-current servo driving system
CN112072986A (en) * 2020-09-14 2020-12-11 厦门势拓御能科技有限公司 Accurate dead-zone compensation method for three-phase inverter and three-phase inverter
CN113595418A (en) * 2021-07-30 2021-11-02 深圳威迈斯新能源股份有限公司 Power control module, control method and half-bridge circuit
CN114123751A (en) * 2021-11-26 2022-03-01 珠海格力电器股份有限公司 Dead zone compensation method, inverter control circuit, device and inverter
CN115528941A (en) * 2022-10-18 2022-12-27 上海大学 Tube voltage drop automatic compensation method of three-phase inverter
CN116345877A (en) * 2023-03-21 2023-06-27 岚图汽车科技有限公司 Dead zone compensation method of switching tube and related equipment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6771518B2 (en) * 2002-08-26 2004-08-03 Potentia Semiconductor, Inc. DC converters
US7193872B2 (en) * 2005-01-28 2007-03-20 Kasemsan Siri Solar array inverter with maximum power tracking
US8587962B2 (en) * 2010-11-08 2013-11-19 GM Global Technology Operations LLC Compensation for electrical converter nonlinearities
KR101268585B1 (en) * 2011-10-05 2013-06-04 주식회사 오토파워 Compensation method of dwad-time for three-phase inverter of SVPWM

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6417736B1 (en) * 2000-11-01 2002-07-09 Lewyn Consulting, Inc. Multiple-voltage supply power amplifier with dynamic headroom control
CN103236798A (en) * 2013-04-26 2013-08-07 北方工业大学 Three-level inverter dead time compensation control method
US10250161B1 (en) * 2018-04-05 2019-04-02 Rockwell Automation Technologies, Inc. Adaptive harmonic elimination compensation for voltage distortion elements
CN110932584A (en) * 2019-12-05 2020-03-27 深圳市汇川技术股份有限公司 Inverter nonlinear compensation method, system, device and storage medium
CN110971134A (en) * 2019-12-19 2020-04-07 南京微盟电子有限公司 Rectifier diode voltage drop compensation system of non-isolated switch power supply
CN111224537A (en) * 2020-02-25 2020-06-02 苏州灵猴机器人有限公司 Inverter dead zone compensation method based on phase current
CN111884546A (en) * 2020-08-06 2020-11-03 武汉久同智能科技有限公司 Low-voltage large-current alternating-current servo driving system
CN112072986A (en) * 2020-09-14 2020-12-11 厦门势拓御能科技有限公司 Accurate dead-zone compensation method for three-phase inverter and three-phase inverter
CN113595418A (en) * 2021-07-30 2021-11-02 深圳威迈斯新能源股份有限公司 Power control module, control method and half-bridge circuit
CN114123751A (en) * 2021-11-26 2022-03-01 珠海格力电器股份有限公司 Dead zone compensation method, inverter control circuit, device and inverter
CN115528941A (en) * 2022-10-18 2022-12-27 上海大学 Tube voltage drop automatic compensation method of three-phase inverter
CN116345877A (en) * 2023-03-21 2023-06-27 岚图汽车科技有限公司 Dead zone compensation method of switching tube and related equipment

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