CN111106744A - Active discharge method and device for inverter - Google Patents
Active discharge method and device for inverter Download PDFInfo
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- CN111106744A CN111106744A CN201811259570.7A CN201811259570A CN111106744A CN 111106744 A CN111106744 A CN 111106744A CN 201811259570 A CN201811259570 A CN 201811259570A CN 111106744 A CN111106744 A CN 111106744A
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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Abstract
The embodiment of the application discloses an inverter active discharge method, which is applied to an inverter and comprises the following steps: if the preset conditions are met, acquiring three-phase current signals and motor rotor position signals; determining a reference voltage according to the three-phase current signal and the motor rotor position signal; determining a driving signal according to the reference voltage; and controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits reactive power to the motor. Therefore, in the application, the inverter can realize the active discharge function based on the existing components of the inverter without adding a special discharge loop or extra hardware cost, so that the active discharge of the inverter can be realized on the basis of not increasing the size and the hardware cost of the inverter.
Description
Technical Field
The application relates to the field of control of electric automobiles and hybrid automobiles, in particular to an active discharge method and device of an inverter.
Background
In electric vehicles and hybrid vehicles, an inverter is generally used to convert high-voltage direct current into three-phase alternating current, and then a motor is driven by the three-phase alternating current to power the entire vehicle. Under the condition that an electric automobile or a plug-in hybrid electric automobile has a vehicle collision accident or a serious vehicle fault, if a main relay is disconnected, in order to protect personal safety, high-voltage electricity remained in a capacitor in a high-voltage direct-current circuit needs to be rapidly discharged through active discharge. It is generally required that the dc side voltage is reduced to below 60 volts (V) by active discharge within 5 seconds after the dc high voltage power supply is turned off.
In a conventional high-voltage active discharge mode, a direct current-direct current converter (DC/DC converter) is generally used to convert high voltage into low voltage of 12V, or a special discharge circuit is added inside an inverter to discharge high voltage in a high-voltage direct current circuit.
However, in order to realize the active discharge function, the dc-dc converter needs to add an additional circuit design, which results in an additional hardware cost. In addition, if a special discharging loop is added inside the inverter system to implement the active discharging function, additional hardware cost is also incurred, and the complexity of the system is also increased.
Disclosure of Invention
In order to solve the technical problem, the present application provides an inverter active discharge method, so as to hopefully realize an active discharge function based on an existing component of an inverter, thereby realizing the active discharge of the inverter on the basis of not increasing the volume and hardware cost of the inverter.
The embodiment of the application discloses the following technical scheme:
the embodiment of the application provides an inverter active discharge method, which is applied to an inverter and comprises the following steps:
if the preset conditions are met, acquiring three-phase current signals and motor rotor position signals;
determining a reference voltage according to the three-phase current signal and the motor rotor position signal;
determining a driving signal according to the reference voltage;
and controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits reactive power to the motor.
Optionally, the determining a driving signal according to the reference voltage includes:
determining a Pulse Width Modulation (PWM) command signal according to the reference voltage;
and determining the driving signal according to the PWM command signal.
Optionally, the preset conditions include: the obtained active discharge instruction signal is in a discharge requesting state, and the voltage signal of the direct current bus is higher than a threshold value;
before the three-phase current signal and the motor rotor position signal are acquired if the preset condition is met, the method further comprises the following steps:
acquiring the active discharge instruction signal and the DC bus voltage signal
Optionally, the determining a reference voltage according to the three-phase current signal and the motor rotor position signal includes:
obtaining direct axis current and quadrature axis current corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signals;
setting preset direct axis current;
setting a preset quadrature axis current to be 0;
obtaining a direct axis voltage according to the direct axis current and the preset direct axis current;
obtaining quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current;
and determining the reference voltage according to the direct-axis voltage, the quadrature-axis voltage and the rotor position signal.
Optionally, obtaining the direct-axis voltage according to the direct-axis current and the preset direct-axis current includes:
and inputting the direct-axis current and the preset direct-axis current into a proportional-integral regulator or a proportional-integral-differential regulator to obtain the direct-axis voltage.
Optionally, obtaining a quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current includes:
and inputting the quadrature axis current and the preset quadrature axis current into a proportional-integral regulator or a proportional-integral-derivative regulator to obtain the quadrature axis voltage.
Optionally, the determining a PWM command signal according to the reference voltage includes:
and performing PWM modulation on the reference voltage to obtain the PWM command signal.
The embodiment of the present application further provides an inverter active discharge device, where the device includes:
the first acquisition unit is used for acquiring a three-phase current signal and a motor rotor position signal if a preset condition is met;
the first determining unit is used for determining reference voltage according to the three-phase current signals and the motor rotor position signals;
a second determination unit for determining a driving signal according to the reference voltage;
and the control unit is used for controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits the reactive power to the motor.
Optionally, the second determining unit is further configured to:
determining a Pulse Width Modulation (PWM) command signal according to the reference voltage;
and determining the driving signal according to the PWM command signal.
Optionally, the preset conditions include: the obtained active discharge instruction signal is in a discharge requesting state, and the voltage signal of the direct current bus is higher than a threshold value;
the device further comprises:
a second obtaining unit for obtaining the active discharge instruction signal and the DC bus voltage signal
Optionally, the first determining unit is further configured to:
obtaining direct axis current and quadrature axis current corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signals;
the preset direct-axis current is set,
setting a preset quadrature axis current to be 0;
obtaining a direct axis voltage according to the direct axis current and the preset direct axis current;
obtaining quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current;
and determining the reference voltage according to the direct-axis voltage, the quadrature-axis voltage and the rotor position signal.
Optionally, the first determining unit is further configured to:
and inputting the direct-axis current and the preset direct-axis current into a proportional-integral regulator or a proportional-integral-differential regulator to obtain the direct-axis voltage.
Optionally, the first determining unit is further configured to
And inputting the quadrature axis current and the preset quadrature axis current into a proportional-integral regulator or a proportional-integral-derivative regulator to obtain the quadrature axis voltage.
Optionally, the second determining unit is further configured to:
and performing PWM modulation on the reference voltage to obtain the PWM command signal.
According to the technical scheme, if the preset conditions are met, the three-phase current signals and the motor rotor position signals can be obtained firstly; then, a reference voltage can be determined according to the three-phase current signals and the motor rotor position signals; then, a driving signal can be determined according to the reference voltage; finally, the on-off state of each power switch in the three-phase full-bridge circuit can be controlled according to the driving signal, so that the three-phase full-bridge circuit transmits reactive power to the motor. Therefore, according to the technical scheme provided by the application, when the inverter needs to actively discharge, the driving signal can be determined according to the three-phase current signal and the motor rotor position signal in the inverter, and the driving signal can be used for controlling the on-off state of each power switch in the three-phase full-bridge circuit in the inverter so that the three-phase full-bridge circuit transmits reactive power to the motor, that is, the three-phase full-bridge circuit can convert high-voltage electricity into reactive power and can quickly consume the reactive power in the motor, for example, the reactive power is consumed in a motor winding and a motor iron core in a heat energy form; therefore, in the application, the inverter can realize the active discharge function based on the existing components of the inverter without adding a special discharge loop or extra hardware cost, so that the active discharge of the inverter can be realized on the basis of not increasing the size and the hardware cost of the inverter.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a method of an active discharge method of an inverter according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an inverter according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a control module in an inverter according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an inverter active discharge device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described below with reference to the accompanying drawings.
In the conventional high-voltage active discharge mode, in order to implement the active discharge function, the dc-dc converter needs to add an additional circuit design, which results in an additional hardware cost. In addition, if a special discharging loop is added inside the inverter system to implement the active discharging function, additional hardware cost is also incurred, and the complexity of the system is also increased.
In order to solve the above problems, embodiments of the present application provide an active discharge method for an inverter, so that the inverter can realize an active discharge function based on existing components of the inverter without adding a special discharge circuit or adding extra hardware cost, thereby realizing active discharge of the inverter without increasing the size and hardware cost of the inverter.
Next, an inverter active discharge method provided by the present application will be described. Referring to fig. 1, a flowchart of a method for an active discharge method of an inverter according to an embodiment of the present application is provided. As shown in fig. 1, the method may include the steps of:
s101: and if the preset conditions are met, acquiring a three-phase current signal and a motor rotor position signal.
In this embodiment, if the preset condition is satisfied, the three-phase current signal i in the inverter may be collected_UVWAnd motor rotor position signals theta, and the three-phase current signals i_UVWAnalyzing to obtain the three-phase current signal i_UVWThe corresponding physical quantity signal and the motor rotor position signal theta can be analyzed to obtain the physical quantity signal corresponding to the motor rotor position signal theta.
Next, an example will be described with reference to fig. 2. As shown in fig. 2, if the preset condition is satisfied, the three-phase current signal analyzing module 6 may analyze the three-phase current signal i acquired by the three-phase current sensor 12_UVWAnalyzing to obtain the three-phase current signal i_UVWCorresponding physical quantity signal iU、iVAnd iWAnd the three-phase current signal analyzing module 6 can analyze the three-phase current signal iU、iVAnd iWSending to the control module 7; and the motor rotor position signal analysis module 5 may analyze the collected motor rotor position signal θ to obtain a physical quantity signal θ corresponding to the motor rotor position signal θ, and the motor rotor position signal analysis module 5 may send the motor rotor position signal θ to the control module 7.
It should be noted that, in one possible implementation, the preset condition may include: the obtained active discharging instruction signal is in a discharging request state, and the voltage signal of the direct current bus is higher than a threshold value. Accordingly, before S101, the following steps may be included: and acquiring the active discharge command signal and the direct current bus voltage signal.
Specifically, when the inverter receives the communication message, the communication message may be analyzed first to obtain an active discharge instruction signal, where the active discharge instruction signal may include a request discharge state or a non-request discharge state. When the inverter receives the DC bus voltage signal UdcThen, the voltage signal U of the DC bus can be adjusteddcAnalyzing to obtain the DC bus voltage signal UdcCorresponding physical quantity signals. After the active discharge instruction signal and the direct-current bus voltage signal are obtained, whether the state of the active discharge instruction signal is a discharge request state or not can be judged; if the active discharging command signal is in the discharging request state, it can be continuously determined whether the dc bus voltage signal is higher than a threshold, for example, the threshold can be set to 60V; if the direct current bus voltage signal is higher than the threshold value, the preset condition can be considered to be met, and therefore a three-phase current signal and a motor rotor position signal can be obtained.
Next, the explanation is continued with reference to fig. 2. As shown in fig. 2, after the inverter acquires a Controller Area Network (CAN) communication message sent by an upper computer through a CAN bus, the discharge instruction parsing module 3 may parse the CAN communication message according to a CAN message definition to obtain an active discharge instruction signal, where the active discharge instruction signal is a discharge request state; then, the discharging command analysis module 3 may send the active discharging command signal to the mode arbitration 4. Furthermore, the dc bus voltage sensor 11 can collect the dc bus voltage signal UdcAnd can convert the DC bus voltage signal UdcSending the signal to a direct current bus voltage signal analysis module 2, wherein the direct current bus voltage signal analysis module 2 can analyze the direct current bus voltage signal UdcAnalyzing to obtain corresponding physical quantity signal, and converting the DC bus voltage signal UdcThe corresponding physical quantity signal is sent to the mode arbitration 4. Mode arbitration 4 may then determine the active dischargeWhether the state of the electrical command signal is a discharge request state or not, and judging the DC bus voltage signal UdcWhether 60V above the threshold; if the active discharge command signal is in the discharge request state, and the DC bus voltage signal U is setdcIf the voltage is higher than the threshold value 60V, the mode arbitration 4 may determine that the preset condition is met, the inverter needs to enter the active discharge mode, the mode arbitration 4 may send an arbitration result including a discharge request instruction to the control module 7, the three-phase current signal analysis module 6 may obtain a three-phase current signal, and the motor rotor position signal analysis module 5 may obtain a motor rotor position signal. The arbitration result may include any one of the following mode commands: a request discharge command and other control mode commands. It should be noted that the mode arbitration 4 may periodically query and acquire the active discharging command signal, and may periodically determine whether the state of the active discharging command signal is the request discharging state.
S102: and determining a reference voltage according to the three-phase current signal and the motor rotor position signal.
After the three-phase current signals and the motor rotor position signals are obtained, the reference voltage can be determined according to the three-phase current signals and the motor rotor position signals. For example, as shown in fig. 2, if the arbitration result obtained by the control module 7 includes a discharge request command, the control module 7 may start to perform a step corresponding to active discharge, for example, a reference voltage may be determined according to the obtained three-phase current signal and the motor rotor position signal; if the arbitration result obtained by the control module 7 includes another control mode instruction, the control module 7 may perform another control.
In one possible implementation, S102 may include the following steps:
s102 a: and obtaining direct axis current and quadrature axis current corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signals.
After the three-phase current signal and the motor rotor position signal are obtained, a direct-axis current (i.e., a d-axis current) and an alternating-axis current (i.e., a q-axis current) corresponding to the three-phase current signal can be calculated according to the three-phase current signal and the motor rotor position signal. For example, the d-axis current and the q-axis current corresponding to the three-phase current signals can be calculated by the following formulas:
wherein id is d-axis current; iq is the q-axis current; theta is a click rotor position signal; the iU, the iV and the iW are physical quantity signals corresponding to the three-phase current signal i _ UVW.
For example, as shown in fig. 3, if the arbitration result obtained by the control module 7 includes a request discharge command, the coordinate conversion one 14 in the control module 7 may obtain the d-axis current id and the q-axis current iq corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signal. Also, coordinate conversion one 14 may send d-axis current id to d-axis current regulator 15 and q-axis current iq to q-axis current regulator 16.
S102 b: the preset direct axis current is set, and the preset quadrature axis current is set to 0.
After the d-axis current and the q-axis current corresponding to the three-phase current signal are obtained, a preset direct-axis current (namely, a preset d-axis current) and a preset quadrature-axis current (namely, a preset q-axis current) can be set. Specifically, the preset d-axis current may be set according to the expected discharge time, for example, one fifth of the irreversible demagnetization current generated by the motor may be used as the set value of the preset d-axis current; and the preset q-axis current is set to 0, so that the current output by the inverter is the demagnetization current of the motor.
S102 c: and obtaining the direct axis voltage according to the direct axis current and the preset direct axis current.
After the d-axis current and the preset d-axis current are obtained, the direct-axis voltage (i.e., the d-axis voltage) can be obtained according to the d-axis current and the preset d-axis current. In one possible implementation, the d-axis current and the preset d-axis current may be input to a proportional-integral (PI) regulator or a proportional-integral-derivative (PID) regulator to obtain the d-axis voltage.
Next, a PI regulator is taken as an example to illustrate how to calculate the d-axis voltage. For example, the d-axis voltage can be calculated by the following formula:
wherein u is* dRepresents the d-axis voltage; i.e. i* dRepresents a preset d-axis current; i.e. idRepresents the d-axis current; k is a radical ofpdRepresents the d-axis current regulator scaling factor; k is a radical ofidRepresenting the d-axis current regulator integral coefficient.
Next, an example will be described with reference to fig. 3. After the d-axis current regulator 15 obtains the d-axis current and the preset d-axis current, the d-axis voltage may be obtained according to the d-axis current and the preset d-axis current, and the d-axis current regulator 15 may send the d-axis voltage to the second coordinate transformation 17.
S102 d: and obtaining quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current.
After the q-axis current and the preset q-axis current with the value of 0 are obtained, the direct-axis voltage (i.e., the q-axis voltage) can be obtained according to the q-axis current and the preset q-axis current. In one possible implementation, the q-axis current and the preset q-axis current may be input to a proportional-integral (PI) regulator or a proportional-integral-derivative (PID) regulator to obtain the q-axis voltage.
Next, a PI regulator is taken as an example to illustrate how to calculate the q-axis voltage. For example, the q-axis voltage may be calculated by the following equation:
wherein u is* qRepresents the q-axis voltage; i.e. i* qRepresenting a predetermined q-axis current; i.e. iqRepresents the q-axis current; kpqRepresents the q-axis current regulator scaling factor; kiqRepresenting the q-axis current regulator integral coefficient.
Next, an example will be described with reference to fig. 3. After the q-axis current regulator 16 obtains the q-axis current and the preset q-axis current, the q-axis voltage may be obtained according to the q-axis current and the preset q-axis current, and the q-axis current regulator 16 may send the q-axis voltage to the second coordinate transformation 17.
S102 e: and determining the reference voltage according to the direct-axis voltage, the quadrature-axis voltage and the rotor position signal.
After the d-axis voltage and the q-axis voltage are obtained, the reference voltage can be determined according to the d-axis voltage, the q-axis voltage and the rotor position signal. For example, the reference voltage can be calculated by the following formula:
wherein u is* U、u* V、u* WAre all reference voltages; theta is a motor rotor position signal; u. of* dRepresents the d-axis voltage; u. of* qRepresenting the q-axis voltage.
Continuing with the example of fig. 3. As shown in fig. 3, after determining the reference voltage according to the d-axis voltage, the q-axis voltage and the rotor position signal, the second coordinate transformation 17 may transmit the reference voltage to the PWM modulation module 8.
S103: determining a driving signal according to the reference voltage.
After acquiring the reference voltage, the inverter may determine a driving signal according to the reference voltage, where the driving signal may be used to control an on/off state of a power switch in the three-phase full-bridge circuit. In a possible implementation manner, the pulse width modulation PWM command signal PWM may be determined according to a reference voltage, specifically, the reference voltage may be PWM modulated, for example, the reference voltage may be PWM modulated by a sinusoidal modulation method or a space vector modulation method, so as to obtain the PWM command signal PWM; then, the drive signal Gate-PWM may be determined based on the PWM command signal PWM.
Next, an example will be described with reference to fig. 2. As shown in fig. 2, after the PWM modulation module 8 obtains the reference voltage, it may determine the pulse width modulation PWM command signal PWM according to the reference voltage, and may send the PWM command signal PWM to the power driving module 9. The power driving module 9 may determine the driving signal Gate-PWM according to the PWM command signal PWM, and transmit the driving signal Gate-PWM to the three-phase full bridge circuit 10.
S104: and controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits reactive power to the motor.
After the driving signal is acquired, the on-off state of each power switch in the three-phase full-bridge circuit can be controlled according to the driving signal, for example, part of the power switches can be controlled to be in the on state, and part of the power switches can be controlled to be in the off state, so that the three-phase full-bridge circuit can transmit reactive power like a motor.
In one implementation, the three-phase full-bridge circuit is composed of 6 power switches, and the power switches in the three-phase full-bridge circuit are Insulated Gate Bipolar Transistor (IGBT) modules, wherein the IGBT modules may include integrated backward diodes of the IGBT modules, the power driving module is an IGBT driving chip, the IGBT driving chip may output corresponding Gate driving signals of the IGBT according to the driving signals, and the IGBT is a passive power device, and may determine that the IGBT is in an on or off state according to the Gate driving signals of the IGBT, so that high voltage electricity existing in the high voltage direct current bus is converted into reactive power through the IGBT modules in the three-phase full-bridge circuit, transmitted to the motor, and finally consumed in the motor windings and the stator core in the form of heat energy.
Continuing with the example of fig. 2. As shown in fig. 2, after the three-phase full-bridge circuit 10 acquires the driving signal, the three-phase full-bridge circuit 10 may control the on/off state of each power switch according to the driving signal, so that the reactive power may be transmitted to the motor 13.
According to the technical scheme, if the preset conditions are met, the three-phase current signals and the motor rotor position signals can be obtained firstly; then, a reference voltage can be determined according to the three-phase current signals and the motor rotor position signals; then, a driving signal can be determined according to the reference voltage; finally, the on-off state of each power switch in the three-phase full-bridge circuit can be controlled according to the driving signal, so that the three-phase full-bridge circuit transmits reactive power to the motor. Therefore, according to the technical scheme provided by the application, when the inverter needs to actively discharge, the driving signal can be determined according to the three-phase current signal and the motor rotor position signal in the inverter, and the driving signal can be used for controlling the on-off state of each power switch in the three-phase full-bridge circuit in the inverter so that the three-phase full-bridge circuit transmits reactive power to the motor, that is, the three-phase full-bridge circuit can convert high-voltage electricity into reactive power and can quickly consume the reactive power in the motor, for example, the reactive power is consumed in a motor winding and a motor iron core in a heat energy form; therefore, in the application, the inverter can realize the active discharge function based on the existing components of the inverter without adding a special discharge loop or extra hardware cost, so that the active discharge of the inverter can be realized on the basis of not increasing the size and the hardware cost of the inverter.
Fig. 4 is a schematic structural diagram of an inverter active discharge device according to an embodiment of the present application. Referring to fig. 4, there is shown an inverter active discharge apparatus, the apparatus comprising:
a first obtaining unit 401, configured to obtain a three-phase current signal and a motor rotor position signal if a preset condition is met;
a first determining unit 402, configured to determine a reference voltage according to the three-phase current signal and the motor rotor position signal;
a second determining unit 403, configured to determine a driving signal according to the reference voltage;
and a control unit 404, configured to control, according to the driving signal, on/off states of power switches in the three-phase full-bridge circuit, so that the three-phase full-bridge circuit transmits reactive power to the motor.
Optionally, the second determining unit 403 is further configured to:
determining a Pulse Width Modulation (PWM) command signal according to the reference voltage;
and determining the driving signal according to the PWM command signal.
Optionally, the preset conditions include: the obtained active discharge instruction signal is in a discharge requesting state, and the voltage signal of the direct current bus is higher than a threshold value;
the device further comprises:
a second obtaining unit for obtaining the active discharge instruction signal and the DC bus voltage signal
Optionally, the first determining unit 402 is further configured to:
obtaining direct axis current and quadrature axis current corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signals;
setting preset direct axis current;
setting a preset quadrature axis current to be 0;
obtaining a direct axis voltage according to the direct axis current and the preset direct axis current;
obtaining quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current;
and determining the reference voltage according to the direct-axis voltage, the quadrature-axis voltage and the rotor position signal.
Optionally, the first determining unit 402 is further configured to:
and inputting the direct-axis current and the preset direct-axis current into a proportional-integral regulator or a proportional-integral-differential regulator to obtain the direct-axis voltage.
Optionally, the first determining unit 402 is further configured to
And inputting the quadrature axis current and the preset quadrature axis current into a proportional-integral regulator or a proportional-integral-derivative regulator to obtain the quadrature axis voltage.
Optionally, the second determining unit 403 is further configured to:
and performing PWM modulation on the reference voltage to obtain the PWM command signal.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium may be at least one of the following media: various media that can store program codes, such as read-only memory (ROM), RAM, magnetic disk, or optical disk.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, they are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the 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. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An inverter active discharge method is applied to an inverter, and the method comprises the following steps:
if the preset conditions are met, acquiring three-phase current signals and motor rotor position signals;
determining a reference voltage according to the three-phase current signal and the motor rotor position signal;
determining a driving signal according to the reference voltage;
and controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits reactive power to the motor.
2. The method of claim 1, wherein determining a drive signal based on the reference voltage comprises:
determining a Pulse Width Modulation (PWM) command signal according to the reference voltage;
and determining the driving signal according to the PWM command signal.
3. The method according to claim 1 or 2, wherein the preset conditions include: the obtained active discharge instruction signal is in a discharge requesting state, and the voltage signal of the direct current bus is higher than a threshold value;
before the three-phase current signal and the motor rotor position signal are acquired if the preset condition is met, the method further comprises the following steps:
and acquiring the active discharge command signal and the direct current bus voltage signal.
4. The method of claim 1 or 2, wherein determining a reference voltage based on the three-phase current signals and the motor rotor position signal comprises:
obtaining direct axis current and quadrature axis current corresponding to the three-phase current signals according to the three-phase current signals and the motor rotor position signals;
setting preset direct axis current;
setting a preset quadrature axis current to be 0;
obtaining a direct axis voltage according to the direct axis current and the preset direct axis current;
obtaining quadrature axis voltage according to the quadrature axis current and the preset quadrature axis current;
and determining the reference voltage according to the direct-axis voltage, the quadrature-axis voltage and the rotor position signal.
5. The method of claim 4, wherein the deriving a direct-axis voltage from the direct-axis current and the preset direct-axis current comprises:
and inputting the direct-axis current and the preset direct-axis current into a proportional-integral regulator or a proportional-integral-differential regulator to obtain the direct-axis voltage.
6. The method of claim 4, wherein obtaining the quadrature voltage according to the quadrature current and the preset quadrature current comprises:
and inputting the quadrature axis current and the preset quadrature axis current into a proportional-integral regulator or a proportional-integral-derivative regulator to obtain the quadrature axis voltage.
7. The method of claim 2, wherein determining a Pulse Width Modulation (PWM) command signal based on the reference voltage comprises:
and performing PWM modulation on the reference voltage to obtain the PWM command signal.
8. An inverter active discharge device, the device comprising:
the first acquisition unit is used for acquiring a three-phase current signal and a motor rotor position signal if a preset condition is met;
the first determining unit is used for determining reference voltage according to the three-phase current signals and the motor rotor position signals;
a second determination unit for determining a driving signal according to the reference voltage;
and the control unit is used for controlling the on-off state of each power switch in the three-phase full-bridge circuit according to the driving signal so that the three-phase full-bridge circuit transmits the reactive power to the motor.
9. The apparatus of claim 8, wherein the second determining unit is further configured to:
determining a Pulse Width Modulation (PWM) command signal according to the reference voltage;
and determining the driving signal according to the PWM command signal.
10. The apparatus according to claim 8 or 9, wherein the preset condition comprises: the obtained active discharge instruction signal is in a discharge requesting state, and the voltage signal of the direct current bus is higher than a threshold value;
the device further comprises:
and the second acquisition unit is used for acquiring the active discharge instruction signal and the direct-current bus voltage signal.
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| CN201811259570.7A CN111106744A (en) | 2018-10-26 | 2018-10-26 | Active discharge method and device for inverter |
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