CN112290816A - Integrated circuit for controlling three-level inverter - Google Patents

Integrated circuit for controlling three-level inverter Download PDF

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CN112290816A
CN112290816A CN202011077692.1A CN202011077692A CN112290816A CN 112290816 A CN112290816 A CN 112290816A CN 202011077692 A CN202011077692 A CN 202011077692A CN 112290816 A CN112290816 A CN 112290816A
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项乾
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Ningbo Saiheng Electronic Technology 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • 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

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Abstract

The invention provides an integrated circuit for controlling a three-level inverter. The integrated circuit comprises five clark transformation modules, a sine calculation module, a multiplication module and a Vc *The device comprises a generation module, a control module, a click inverse transformation module and a PWM (pulse-width modulation) module; the first to fourth clark conversion modules convert to obtain voltage and current in a two-phase static coordinate system; the multiplication module calculates to obtain a three-phase output current given value; the fifth clark conversion module obtains the current I in the two-phase static coordinate system according to the given value of the three-phase output currento * αβ；Vc *The generating module is based on the current Io * αβCalculating to obtain a given value of the capacitor voltage; the control module calculates to obtain a control quantity based on the given value of the capacitor voltage; control input of clark inverse transformation modulePerforming line transformation to obtain three-phase control quantity; and the PWM module realizes three-level inversion control according to the three-phase control quantity.

Description

Integrated circuit for controlling three-level inverter
Technical Field
The invention relates to the technical field of power supplies, in particular to an integrated circuit for controlling a three-level inverter.
Background
In electronic technology, the process of converting ac energy into dc energy is generally referred to as rectification, and the device for carrying out the rectification process is referred to as a rectifying device or rectifier. Correspondingly, the process of converting the direct current electric energy into the alternating current electric energy is called inversion, and a device for realizing the inversion process is called an inversion device or an inverter.
The inverters include a three-level inverter and a two-level inverter. The three-level inverter is a diode neutral point clamped type or a T type, and has the advantages of high voltage and high capacity, higher output voltage quality, lower switching loss and the like compared with the traditional two-level inverter.
The general three-phase inverter has high energy consumption, the working efficiency of the system is low due to the application of the traditional control algorithm, the control precision is limited, and the actual requirements cannot be met. The invention carries out detailed analysis and research aiming at algorithm optimization and energy consumption reduction in the control of the three-phase inverter, saves the occupation of chip resources by improving the algorithm, improves the operation efficiency of the whole system, reduces the dependence on peripheral devices and has good development prospect in the control application aspect of the three-phase inverter.
Disclosure of Invention
The present invention is proposed in view of the above problems, so as to provide an integrated circuit for controlling a three-level inverter, which solves the problems of backward control technique and low working efficiency in the current three-level inverter application.
The technical scheme adopted by the invention is as follows: an integrated circuit for controlling a three-level inverter whose three-phase bridge arm passes through a three-phase inductance L1、L2Generating a three-phase output voltage, said three-phase inductance L1、L2The connection point of the three-phase capacitor is grounded through a three-phase capacitor C; the integrated circuit comprises five clark transformation modules, a sine calculation module, a multiplication module and a Vc *The device comprises a generation module, a control module, a click inverse transformation module and a PWM (pulse-width modulation) module; the first to fourth clark conversion modules respectively convert the three-phase inductive current I obtained by samplingL1uvwThree-phase capacitor voltage VcuvwThree-phase output current IouvwThree-phase output voltage VsuvwConverting into voltage and current I in two-phase static coordinate systemL1αβ、Vcαβ、Ioαβ、VsαβAnd input to the control module; the sine calculation module calculates the sine value of the output current phase angle according to the output current phase angle theta obtained by sampling and inputs the sine value to the multiplication module; multiplication module based on outputSine value of output current phase angle and output current amplitude given value IoampCalculating to obtain a given value I of three-phase output currento * uvwAnd input to a fifth click conversion module; a fifth clark conversion module for setting the three-phase output currento * uvwPerforming clark transformation to obtain current I in a two-phase static coordinate systemo * αβAnd is inputted into Vc *A generation module; vc *The generating module is based on the current Io * αβCalculating to obtain a given value V of the capacitor voltagec * αβAnd input to the control module; control module based on capacitor voltage given value Vc * αβ、Current IL1αβ、Ioαβ、Voltage Vcαβ、VsαβAnd calculating to obtain a control quantity delta TαβInputting the data into a click inverse transformation module; clark inverse transformation module pair control quantity delta TαβCarrying out clark inverse transformation to obtain corresponding three-phase control quantity delta TuvwAnd input to the PWM modulation module; the PWM module controls the quantity delta T according to three phasesuvwAdjusting the conduction time of transistors in the three-phase bridge arm to realize three-level inversion control;
the specific working principle of the control module is as follows:
three-phase inductance L1The voltage is as follows:
Figure BDA0002717104530000023
current through three-phase inductance L1The first derivative of the current is:
Figure BDA0002717104530000021
three-phase capacitive current Ic(t) is:
Figure BDA0002717104530000024
the three-phase capacitor voltage is:
Figure BDA0002717104530000022
the first derivative of the three-phase capacitor voltage is:
Figure BDA0002717104530000031
wherein, VI(t) is the three-phase bridge arm output voltage, Io(t) is the three-phase output current, t is time;
based on the voltage and current I in the two-phase static coordinate systemoαβ、Vcαβ、
Figure BDA0002717104530000039
The state variable X can be constructed2The expression of (a) is:
Figure BDA00027171045300000310
wherein the content of the first and second substances,
Figure BDA0002717104530000032
Y2＝[VIαβ]，Z＝[Vsαβ]；
discretizing it to obtain
X2[k+1]＝F2X2[k]+G2Y2[k]+G3Z[k]
Wherein the content of the first and second substances,
Figure BDA0002717104530000033
Figure BDA0002717104530000034
Tcis the carrier period;
further, Δ T can be obtainedαβExpression (c):
Figure BDA0002717104530000035
the V isc *The specific working principle of the generation module is as follows:
three-phase inductance L2The voltage of (a) is:
Figure BDA0002717104530000036
wherein, Vs(t) is the three-phase output voltage;
the three-phase output current is:
Figure BDA0002717104530000037
the first derivative of the three-phase output current is:
Figure BDA0002717104530000038
suppose a three-phase output voltage Vs(t) is an ideal sine wave, then three-phase output voltage VsThe first and second derivatives of (t) are:
Vs(t)＝sinωt
Figure BDA0002717104530000041
Figure BDA0002717104530000042
wherein, ω is the angular frequency of the three-phase output voltage;
based on the voltage and current I in the two-phase static coordinate systemoαβ、VsαβIt is possible to construct a state variable X1The expression of (a) is:
Figure BDA0002717104530000043
wherein the content of the first and second substances,
Figure BDA0002717104530000044
Y1＝[Vcαβ]。
discretizing it to obtain
X1[k+1]＝F1X1[k]+G1Y1[k]
Wherein the content of the first and second substances,
Figure BDA0002717104530000045
Tsis a sampling period;
further, the reference value of the capacitor voltage can be obtained
Figure BDA0002717104530000046
Expression (c):
Figure BDA0002717104530000047
the reference value of the capacitor voltage is input into the control module, so that the output current is equal to the reference value of the output current.
The three-level inverter comprises a DC input voltage VinTwo voltage-dividing capacitors, three-phase bridge arm and three-phase inductor L1、L2A three-phase capacitor C for inputting DC voltage V to the three-level inverterinInverting to three-phase alternating current VsOutputting; the three-phase bridge arm generates three-phase bridge arm output voltage, three-phase inductance current is generated after the three-phase bridge arm output voltage is filtered by a three-phase inductor L1, and three-phase output current and three-phase output voltage are generated after the three-phase inductance current is filtered by LC.
Respectively sampling voltage and current of three-phase bridge arm output voltage, three-phase inductive current, three-phase output voltage and three-phase capacitor voltage to obtain corresponding three-phase bridge arm output voltage VIuvwThree-phase inductive currentIL1uvwThree-phase output current IouvwAnd three-phase output voltage VsuvwThree-phase capacitor voltage Vcuvw。
The invention has the beneficial effects that:
(1) the general three-level inverter has low working efficiency and limited control precision, and the invention improves the operation efficiency and the control precision of the three-level inverter to a great extent by improving the control method.
(2) And a novel integrated circuit design is used, so that the control is simple and the integration performance is good.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a circuit structure diagram of a three-level inverter according to the present invention;
fig. 2 is an integrated circuit for controlling a three-level inverter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The invention is further described with reference to the following figures and specific examples.
FIG. 1 shows a schematic view of aThe invention provides a circuit structure diagram of a three-level inverter. The three-level inverter comprises a DC input voltage VinTwo voltage-dividing capacitors, three-phase bridge arm and three-phase inductor L1、L2A three-phase capacitor C for inputting DC voltage V to the three-level inverterinInverting to three-phase alternating current VsAnd (6) outputting. Each phase bridge arm comprises four transistor switches to realize three-level inversion. The three-level inverter adopts a PWM (pulse-width modulation) technology to control a three-phase bridge arm to generate a three-phase bridge arm output voltage VIAfter being filtered by a three-phase inductor L1, three-phase inductive current I is generatedL1Then is filtered by LC to generate three-phase output current IoAnd three-phase output voltage VsWhile the voltage on the three-phase output capacitor is VcRespectively sampling voltage and current to obtain corresponding three-phase bridge arm output voltage VIuvwThree-phase inductive current IL1uvwThree-phase output current IouvwAnd three-phase output voltage VsuvwThree-phase capacitor voltage Vcuvw。
In the present embodiment, the three-level inverter has a T-type three-level topology.
As an alternative embodiment, the three-level inverter is an I-type three-level topology.
Fig. 2 is an integrated circuit for controlling a three-level inverter according to the present invention. The integrated circuit comprises five clark transformation modules, a sine calculation module, a multiplication module and a Vc *The device comprises a generation module, a control module, a click inverse transformation module and a PWM modulation module. The first to fourth clark conversion modules respectively convert the three-phase inductive current I obtained by samplingL1uvwThree-phase capacitor voltage VcuvwThree-phase output current IouvwThree-phase output voltage VsuvwConverting into voltage and current I in two-phase static coordinate systemL1αβ、Vcαβ、Ioαβ、VsαβAnd input to the control module。And the sine calculation module calculates the sine value of the output current phase angle according to the output current phase angle theta obtained by sampling and inputs the sine value to the multiplication module. The multiplication module is based on the sum of the sine values of the phase angles of the output currentsGiven value I of output current amplitudeoampCalculating to obtain a given value I of three-phase output currento * uvwAnd input to a fifth clock transform module. A fifth clark conversion module for setting the three-phase output currento * uvwPerforming clark transformation to obtain current I in a two-phase static coordinate systemo * αβAnd is inputted into Vc *A module is generated. Vc *The generating module is based on the current Io * αβCalculating to obtain a given value V of the capacitor voltagec * αβAnd input to the control module. Control module based on capacitor voltage given value Vc * αβ、Current IL1αβ、Ioαβ、Voltage Vcαβ、VsαβAnd calculating to obtain a control quantity delta TαβAnd inputting the input data to a click inverse transformation module. clark inverse transformation module pair control quantity delta TαβCarrying out clark inverse transformation to obtain corresponding three-phase control quantity delta TuvwAnd input to the PWM modulation module. The PWM module controls the quantity delta T according to three phasesuvwAnd adjusting the conduction time of the transistors in the three-phase bridge arm to realize three-level inversion control.
Vc *The specific working principle of the generation module is as follows:
the voltage of the three-phase inductor L2 is:
Figure BDA0002717104530000071
wherein, Vc(t) is the three-phase capacitor voltage, VsAnd (t) is the three-phase output voltage.
The three-phase output current is:
Figure BDA0002717104530000072
the first derivative of the three-phase output current is:
Figure BDA0002717104530000073
suppose a three-phase output voltage Vs(t) is an ideal sine wave, then three-phase output voltage VsThe first and second derivatives of (t) are:
Vs(t)＝sinωt
Figure BDA0002717104530000074
Figure BDA0002717104530000075
where ω is the angular frequency of the three-phase output voltage and t is time.
Based on the voltage and current I in the two-phase static coordinate systemoαβ、VsαβIt is possible to construct a state variable X1The expression of (a) is:
Figure BDA0002717104530000076
wherein the content of the first and second substances,
Figure BDA0002717104530000077
Y1＝[Vcαβ]。
discretizing it to obtain
X1[k+1]＝F1X1[k]+G1Y1[k]
Wherein the content of the first and second substances,
Figure BDA0002717104530000078
Tsis the sampling period.
Further, the reference value of the capacitor voltage can be obtained
Figure BDA0002717104530000079
Expression (c):
Figure BDA00027171045300000710
the reference value of the capacitor voltage is input into the control module, so that the output current is equal to the reference value of the output current.
The specific working principle of the control module is as follows:
the voltage of the three-phase inductor L1 is as follows:
Figure BDA0002717104530000081
the first derivative of the current through the three-phase inductor L1 is:
Figure BDA0002717104530000082
wherein, VIAnd (t) is the output voltage of the three-phase bridge arm.
Three-phase capacitive current Ic(t) is:
Figure BDA0002717104530000083
the three-phase capacitor voltage is:
Figure BDA0002717104530000084
the first derivative of the three-phase capacitor voltage is:
Figure BDA0002717104530000085
based on the voltage and current I in the two-phase static coordinate systemoαβ、Vcαβ、
Figure BDA0002717104530000086
The state variable X can be constructed2Watch (A)The expression is as follows:
Figure BDA0002717104530000087
wherein the content of the first and second substances,
Figure BDA0002717104530000088
Y2＝[VIαβ]，Z＝[Vsαβ]。
discretizing it to obtain
X2[k+1]＝F2X2[k]+G2Y2[k]+G3Z[k]
Wherein the content of the first and second substances,
Figure BDA0002717104530000089
Figure BDA00027171045300000810
Tcis the carrier period.
Further, Δ T can be obtainedαβExpression (c):
Figure BDA00027171045300000811
in the present embodiment, the reference value of the capacitor voltage and the control amount Δ T are setαβThe operating efficiency and the control accuracy of the three-level inverter can be improved.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. An integrated circuit for controlling a three-level inverter whose three-phase bridge arm passes through a three-phase inductance L1、L2Generating a three-phase output voltage, said three-phase inductance L1、L2The connection point of the three-phase capacitor is grounded through a three-phase capacitor C; wherein the integrated circuit has five clark transform modules, sine calculation module, multiplication module, and Vc *The device comprises a generation module, a control module, a click inverse transformation module and a PWM (pulse-width modulation) module; the first to fourth clark conversion modules respectively convert the three-phase inductive current I obtained by samplingL1uvwThree-phase capacitor voltage VcuvwThree-phase output current IouvwThree-phase output voltage VsuvwConverting into voltage and current I in two-phase static coordinate systemL1αβ、Vcαβ、Ioαβ、VsαβAnd input to the control module; the sine calculation module calculates the sine value of the output current phase angle according to the output current phase angle theta obtained by sampling and inputs the sine value to the multiplication module; the multiplication module is based on the sine value of the phase angle of the output current and the given value I of the amplitude of the output currentoampCalculating to obtain a given value I of three-phase output currento * uvwAnd input to a fifth click conversion module; a fifth clark conversion module for setting the three-phase output currento * uvwPerforming clark transformation to obtain current I in a two-phase static coordinate systemo * αβAnd is inputted into Vc *A generation module; vc *The generating module is based on the current Io * αβCalculating to obtain a given value V of the capacitor voltagec * αβAnd input to the control module; control module based on capacitor voltage given value Vc * αβ、Current IL1αβ、Ioαβ、Voltage Vcαβ、VsαβAnd calculating to obtain a control quantity delta TαβInputting the data into a click inverse transformation module; clark inverse transformation module pair control quantity delta TαβCarrying out clark inverse transformation to obtain corresponding three-phase control quantity delta TuvwAnd input to the PWM modulation module; PWM modulation module according toThree-phase control quantity delta TuvwAnd adjusting the conduction time of the transistors in the three-phase bridge arm to realize three-level inversion control.
2. The integrated circuit of claim 1, wherein the specific operation principle of the control module is as follows:
three-phase inductance L1The voltage is as follows:
Figure FDA0002717104520000011
current through three-phase inductance L1The first derivative of the current is:
Figure FDA0002717104520000021
three-phase capacitive current Ic(t) is:
Figure FDA0002717104520000022
the three-phase capacitor voltage is:
Figure FDA0002717104520000023
the first derivative of the three-phase capacitor voltage is:
Figure FDA0002717104520000024
wherein, VI(t) is the three-phase bridge arm output voltage, Io(t) is the three-phase output current, t is time;
based on the voltage and current I in the two-phase static coordinate systemoαβ、Vcαβ、
Figure FDA0002717104520000025
The state variable X can be constructed2The expression of (a) is:
Figure FDA0002717104520000026
wherein the content of the first and second substances,
Figure FDA0002717104520000027
Y2＝[VIαβ]，Z＝[Vsαβ]；
discretizing it to obtain
X2[k+1]＝F2X2[k]+G2Y2[k]+G3Z[k]
Wherein the content of the first and second substances,
Figure FDA0002717104520000028
Figure FDA0002717104520000029
Tcis the carrier period;
further, Δ T can be obtainedαβExpression (c):
Figure FDA00027171045200000210
3. the integrated circuit of claim 1, wherein V is greater than Vc *The specific working principle of the generation module is as follows:
three-phase inductance L2The voltage of (a) is:
Figure FDA00027171045200000211
wherein, Vs(t) is the three-phase output voltage;
the three-phase output current is:
Figure FDA0002717104520000031
the first derivative of the three-phase output current is:
Figure FDA0002717104520000032
suppose a three-phase output voltage Vs(t) is an ideal sine wave, then three-phase output voltage VsThe first and second derivatives of (t) are:
Vs(t)＝sinωt
Figure FDA0002717104520000033
Figure FDA0002717104520000034
wherein, ω is the angular frequency of the three-phase output voltage;
based on the voltage and current I in the two-phase static coordinate systemoαβ、VsαβIt is possible to construct a state variable X1The expression of (a) is:
Figure FDA0002717104520000035
wherein the content of the first and second substances,
Figure FDA0002717104520000036
Y1＝[Vcαβ]。
discretizing it to obtain
X1[k+1]＝F1X1[k]+G1Y1[k]
Wherein the content of the first and second substances,
Figure FDA0002717104520000037
Tsis a sampling period;
further, the reference value of the capacitor voltage can be obtained
Figure FDA0002717104520000038
Expression (c):
Figure FDA0002717104520000039
the reference value of the capacitor voltage is input into the control module, so that the output current is equal to the reference value of the output current.
4. The integrated circuit of claim 1, wherein the three-level inverter comprises a DC input voltage VinTwo voltage-dividing capacitors, three-phase bridge arm and three-phase inductor L1、L2A three-phase capacitor C for inputting DC voltage V to the three-level inverterinInverting to three-phase alternating current VsOutputting; the three-phase bridge arm generates three-phase bridge arm output voltage, three-phase inductance current is generated after the three-phase bridge arm output voltage is filtered by a three-phase inductor L1, and three-phase output current and three-phase output voltage are generated after the three-phase inductance current is filtered by LC.
5. The integrated circuit of claim 1, wherein the three-phase bridge arm output voltage, the three-phase inductive current, the three-phase output voltage, and the three-phase capacitive voltage are respectively sampled by voltage and current to obtain corresponding three-phase bridge arm output voltage VIuvwThree-phase inductive current IL1uvwThree-phase output current IouvwAnd three-phase output voltage VsuvwThree-phase capacitor voltage Vcuvw。
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