CN112910296A - Single-phase inverter - Google Patents

Single-phase inverter Download PDF

Info

Publication number
CN112910296A
CN112910296A CN202110019281.5A CN202110019281A CN112910296A CN 112910296 A CN112910296 A CN 112910296A CN 202110019281 A CN202110019281 A CN 202110019281A CN 112910296 A CN112910296 A CN 112910296A
Authority
CN
China
Prior art keywords
decoupling
branch
switches
capacitor
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110019281.5A
Other languages
Chinese (zh)
Other versions
CN112910296B (en
Inventor
于功山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yuanshan Jinan Electronic Technology Co ltd
Original Assignee
Yuanshan Jinan Electronic Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yuanshan Jinan Electronic Technology Co ltd filed Critical Yuanshan Jinan Electronic Technology Co ltd
Priority to CN202110019281.5A priority Critical patent/CN112910296B/en
Publication of CN112910296A publication Critical patent/CN112910296A/en
Application granted granted Critical
Publication of CN112910296B publication Critical patent/CN112910296B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The embodiment of the present application provides a single-phase inverter, it includes: the circuit comprises a direct current power supply, a direct current bus capacitor, a conversion circuit and a decoupling circuit. The direct current bus capacitor is connected between the positive electrode and the negative electrode of the direct current power supply. The conversion circuit is connected with the direct current bus capacitor in parallel; the conversion circuit comprises a plurality of switches, the switches form two conversion branches which are connected in parallel, and each conversion branch is formed by connecting two switches in series. The connection point of the two switches in each switching branch serves as an output node of the single-phase inverter. The decoupling circuit is connected in series between the direct current bus capacitor and the conversion circuit. Through the technical scheme, the direct-current bus capacitor with the small capacitance value can be adopted, so that the service life of the single-phase inverter is prolonged, and the use experience of a user is improved.

Description

Single-phase inverter
Technical Field
The invention relates to the technical field of power electronic equipment, in particular to a single-phase inverter.
Background
The single-phase inverter is widely applied to the fields of uninterruptible power supplies, photovoltaics, vehicle grids and the like. In order to realize a single-phase inverter with high power density, an output filter and a direct-current link capacitor are two passive devices which need to be considered so as to reduce the volume. .
For the dc link side of a single phase inverter, it is common in the prior art to absorb the pulsed power at twice the fundamental frequency by means of a large electrolytic capacitor. The large-capacity electrolytic capacitor may shorten the service life of the single-phase inverter, and affect the user experience. Therefore, how to adopt a capacitor with a smaller capacitance value to meet the requirement of absorbing pulse power at twice fundamental frequency makes the inverter have longer service life, and becomes a problem to be solved urgently by a single-phase inverter.
Disclosure of Invention
The embodiment of the application provides a single-phase inverter, and aims to solve the problem that the service life of the single-phase inverter is shortened due to overlarge capacity of a direct-current bus capacitor in the existing single-phase inverter.
The embodiment of the present application provides a single-phase inverter, it includes: the circuit comprises a direct current power supply, a direct current bus capacitor, a conversion circuit and a decoupling circuit. The direct current bus capacitor is connected between the positive electrode and the negative electrode of the direct current power supply. The conversion circuit is connected with the direct current bus capacitor in parallel and comprises a plurality of switches, the switches form two conversion branches, the two conversion branches are connected in parallel, and each conversion branch is formed by connecting the two switches in series. The connection point of the two switches in each conversion branch is used as an output node of the single-phase inverter. The decoupling circuit is connected in series between the direct current bus capacitor and the conversion circuit. The decoupling circuit comprises at least a plurality of switches, at least one first capacitor and at least one first inductor. And a plurality of switches in the decoupling circuit form a first decoupling branch, a second decoupling branch and a third decoupling branch, and the first decoupling branch, the second decoupling branch and the third decoupling branch are formed by connecting two switches in series. The capacitor, the first decoupling branch, the second decoupling branch and the third decoupling branch are connected in series. A first inductor is connected between the second decoupling branch and the third decoupling branch.
In one possible implementation, the decoupling circuit further includes a second capacitor and a second inductor. One end of the second capacitor is connected to a first output node of the decoupling branch, and the first output node of the decoupling circuit is a connection point of the two switches in the third decoupling branch. The other end of the second capacitor is connected with a second output node of the decoupling circuit through a second inductor; the second output node of the decoupling circuit is the connection point of the two switches in the first decoupling branch.
In one possible implementation manner, the conversion circuit further includes two third inductors, at least one third capacitor, and at least one first load. The two third inductors are respectively connected with one output node of the single-phase inverter, and the two third inductors are connected through at least one third capacitor. The first load is connected in parallel to two ends of the third capacitor.
In a possible implementation manner, the switch comprises a MOS tube and a diode, and the MOS tube is connected with the diode in a reverse direction.
In a possible implementation manner, the single-phase inverter further includes a second load, one end of the second load is connected to the positive electrode of the dc power supply, and the other end of the second load is connected to the dc bus capacitor.
In one possible implementation, the single-phase inverter further includes: and the control unit is connected with the direct-current power supply and the switches. The control unit is used for sampling the direct current link voltage and calculating ripple voltage of the direct current link voltage. The direct-current link voltage refers to the voltage at two ends of a branch circuit after the direct-current power supply and the second load are connected in series. And the control unit is used for generating a pulse width modulation control signal corresponding to a switch in the decoupling circuit according to the calculated ripple voltage of the direct current link voltage and a preset modulation mode, so that the switch is switched on or switched off.
In a possible implementation manner, the pulse width modulation control signal corresponding to the switch in the decoupling circuit is generated according to the ripple voltage of the dc link voltage obtained by calculation and a preset modulation manner, and is specifically obtained by the following formula:
Figure BDA0002887865100000021
Figure BDA0002887865100000031
Figure BDA0002887865100000032
wherein m isapFor the pulse-width-modulated control signal of the switches in the first decoupling branch, mbpFor the pulse-width-modulated control signal of the switches in the second decoupling branch, mcpIs a third coupling branchPulse width modulation control signal, v, of in-circuit switchaIs the voltage of the second output node of the decoupling circuit, vaFor the voltage at the junction of the two switches in the first decoupling branch, VinIs the supply voltage of the dc power supply.
The embodiment of the application provides a single-phase inverter, through DC power supply, direct current bus capacitance, conversion circuit and the cooperation between the decoupling circuit, under the condition that does not influence and reduce direct current link ripple voltage, can select the direct current bus capacitance littleer for direct current bus capacitance among the traditional inverter, avoided the problem that the life of single-phase inverter that causes because of direct current bus capacitance's capacitance value is too high shorter to improve user's use and experience.
Drawings
The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description serve to explain the description and not to limit the specification in a non-limiting sense. In the drawings:
fig. 1 is a schematic structural diagram of a single-phase inverter provided in an embodiment of the present application;
fig. 2 is an ideal operating waveform of a single-phase inverter provided by an embodiment of the present application;
FIG. 3 is a control block diagram of the decoupling circuit shown in FIG. 1;
FIG. 4 is a basic PI control block diagram of the decoupling circuit shown in FIG. 2;
fig. 5 is a control block diagram of a single-phase inverter provided in an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of an inverter according to an embodiment of the present application, and as shown in fig. 1, the inverter includes: DC power supply DC, DC bus capacitor CbusA conversion circuit 110, a decoupling circuit 120, a second load Rs。
The DC power supply may be a battery or an AC/DC converter.
As shown in fig. 1, the dc bus capacitor CbusThe second load R is connected between the positive electrode and the negative electrode of the DC power supply DCsOne end of the capacitor is connected with the anode of the direct current power supply, the other end of the capacitor and the direct current bus capacitor CbusAnd (4) connecting. The conversion circuit 110 and the dc bus capacitor Cbus Parallel decoupling circuit 120 is connected in series with DC bus capacitor CbAnd a switching circuit 110.
Specifically, as shown in fig. 1, the decoupling branch 120 includes: a plurality of switches, at least one first capacitor CaAnd at least one first inductance La。
The plurality of switches in the decoupling circuit 120 form a first decoupling branch, a second decoupling branch and a third decoupling circuit, the first decoupling branch, the second decoupling branch and the third decoupling circuit are formed by connecting two switches in series, and the first capacitor CaThe first decoupling branch, the second decoupling branch and the third decoupling branch are all formed by connecting two switches in series and are connected in parallel.
In addition, a first inductance L is connected between the second and third decoupling branchesaFirst inductance LaThe connection point c to the third decoupling branch serves as the first output node of the decoupling circuit 120, and the connection points a of the two switches in the first decoupling branch serve as the second output node of the decoupling circuit 120, as shown in fig. 1.
Furthermore, the decoupling circuit 120 further includes a second inductor LbAnd a second capacitor Cb. Second inductance LbIs connected to the second output node a of the decoupling branch 120, a second inductance LbIs passed through a second capacitor CbTo the first output node c of the decoupling branch 120.
The conversion circuit 110 includes a plurality of switches, two third inductors L1、L2At least one third capacitor C and at least one first load R.
Specifically, the switches form two conversion branches, and each conversion branch is formed by connecting two switches in seriesAnd (4) forming. The two conversion branches are connected in parallel, and the connection point of the switch in each conversion branch is used as an output node of the single-phase inverter. Third inductance L1、L2Are respectively connected with one output node of the single-phase inverter, and a third inductor L1And a third inductance L2Connected with each other through a third capacitor C, and the first load R is connected in parallel with two ends of the third capacitor C, as shown in fig. 1.
In this application embodiment, under the same condition, the dc bus capacitance that the capacitance value is the same, compare with prior art, the technical scheme that this application embodiment provided can more effectual reduction dc link ripple voltage. That is, the capacitance of the dc bus capacitor used in the embodiment of the present application is lower than that of the dc bus capacitor in the prior art, so as to reduce the dc link ripple voltage by the same value.
In one embodiment of the present application, the switch in the single-phase inverter may be composed of a MOS transistor and a diode, and the MOS transistor and the diode are connected in inverse parallel.
The diode may be a body diode of a MOS transistor, or may be a separate diode.
In an embodiment of the present application, the MOS transistor may be a silicon carbide MOS transistor. In the embodiment of the present application, a higher switching frequency can be obtained by using the silicon carbide diode with respect to the gallium nitride diode, and the characteristics of the silicon carbide diode do not change much with the increase of temperature compared to the gallium nitride diode.
In addition, for efficiency and design, the switch can select a 100kHz switching frequency based on a silicon carbide MOS tube. Depending on the switching frequency, the ac output filter can be easily designed.
As shown in fig. 1, in the single-phase inverter provided in the embodiments of the present application, an output ac voltage v is outputacAnd current iacGiven by equations (1) and (2), respectively:
vac(t)＝V sin ωt(1)
Figure BDA0002887865100000051
where V is the voltage of the load connected to the output node of the single-phase inverter, I is the magnitude of the current provided by the single-phase inverter, ω is the angular frequency of the single-phase inverter,
Figure BDA0002887865100000052
is the power factor angle.
Then, the instantaneous power output by the single-phase inverter is given by equation (3):
Figure BDA0002887865100000053
DC bus capacitor CbusDerivable as (4):
Figure BDA0002887865100000061
wherein, PoRated power, U, of a single-phase inverterdcIs the DC link voltage, Δ UdcIs the ripple voltage of the dc link.
Since the ripple voltage of the dc link is caused by the dual frequency term in equation (3), as shown in fig. 1, a decoupling circuit 120 is connected between points a and B in fig. 1 to eliminate the dc link voltage fluctuation.
The voltage and current of AB are defined by (5) and (6), respectively, assuming the phase is the same as the dc link voltage ripple.
vAB(t)＝VAB sin 2ωt (5)
Figure BDA0002887865100000062
Wherein v isABAnd iABIs the magnitude of the series voltage and current. Because the voltage ripple of the DC link is the second harmonic, VABWith the same angular frequency. For decoupling electricityFor the circuit 120, the load has only one second capacitor CbWhen a current iABCan be derived from (7):
Figure BDA0002887865100000063
thus, the instantaneous power provided by the decoupling circuit 120 is given by (8):
PAB(t)＝ωCbVAB 2sin 4ωt (8)
from equation (8), the instantaneous power P of the decoupling circuit 120 is knownABThere is no active power for a period of time. First capacitance C of decoupling circuit 120aOnly the reactive power of the dc link can be absorbed.
Similar to the DC bus capacitor, the first capacitor C in the decoupling circuit 120aBut also by the nominal power and ripple voltage. The decoupling circuit 120 also has a fourth harmonic voltage ripple according to equation (8). In addition, because the switching device is not ideal, the filter inductance and the capacitor have some parasitic parameters, and the second capacitor CbThere may be a dc component and other higher order harmonic components may be present in the compensation voltage and current. They can also be analyzed using the above equation based on fourier analysis. If in the middle VABInjecting a small amount of DC component, VABThe following can be defined:
vAB(t)＝VAB sin 2ωt+Vdc_bias (9)
wherein, Vdc_biasIs a dc component and the corresponding value is small.
The instantaneous power then changes as follows:
Figure BDA0002887865100000071
according to equation (10), the first capacitance CaWith second and fourth harmonic voltage ripples. The magnitude of the fourth harmonic is much larger than the second harmonic order.
Due to the memory of the decoupling circuit 120The use of the decoupling circuit 120 as shown in fig. 1 further reduces the first capacitance C at the 4 th harmonic level voltage rippleaAnd further increases the power density.
For the decoupling circuit 120, the voltage and current equations are assumed as follows:
Figure BDA0002887865100000072
Figure BDA0002887865100000073
based on the spatial vectorial calculation, the total instantaneous power using the decoupling circuit 120 in fig. 1 can be represented as (13):
Figure BDA0002887865100000074
in order to reduce the first capacitance CaA first capacitor CaThe fourth harmonic order voltage ripple in the second inductor L is transferred to the second inductor LbThis means that the above equation is equal to zero. Then according to the second inductance LbThe relationship between the upper voltage and the current, and the second inductance L is calculated by the equation (14)bKey value of (c):
Figure BDA0002887865100000075
Figure BDA0002887865100000076
the second inductance L is twice as high as the conventional parallel connection method due to the low rated powerbCan be small.
Fig. 3 is an ideal operating waveform of the single-phase inverter provided in the embodiment of the present application. The filter inductances, the conduction losses and the switching losses in the circuit of the single-phase inverter are ignored here. It is apparent that the decoupling circuit 120 can provide a second harmonic voltage ripple to cancel the fluctuating power on the ac side. The output voltage and current waveforms of the decoupling circuit 120 are also shown in fig. 2.
In one embodiment of the present application, the single-phase inverter further includes a control unit (not shown in the figure) connected to the dc power source and the plurality of switches. The control unit is used for sampling the direct-current link voltage in the single-phase inverter and calculating the ripple voltage of the direct-current link voltage; and the pulse width modulation control circuit is used for generating a pulse width modulation control signal corresponding to the switch according to the calculated ripple voltage of the direct current link voltage and a preset modulation rule, so that the switch is switched on or switched off.
In particular, due to the analysis of the above theory and equations, the reference voltage is known per phase for power decoupling control in the decoupling circuit. Suppose vaIs a reference voltage, V, of the output voltage of the decoupling circuit 120bIs the second inductance L shown in FIG. 1bThe reference voltage of (1). The pulse width modulation control signal for the switches on each branch in the decoupling circuit 120 is given by the following equation (15):
Figure BDA0002887865100000081
Figure BDA0002887865100000082
wherein m isapFor the pulse-width-modulated control signal of the switch in the first decoupling branch not connected to the first inductor, mbpFor the pulse-width-modulated control signal of the switches in the second decoupling branch, mcpPulse width modulation control signal v of switch in first decoupling branch connected with first inductorbIs the voltage of the second output node of the decoupling circuit, vaFor the voltage, V, at the junction of two switches in the second decoupling branchinIs the supply voltage of the dc power supply.
Fig. 3 is a control block diagram of a decoupling circuit according to an embodiment of the present disclosure. As shown in fig. 3, first,for the DC link voltage V shown in FIG. 1dcSamples are taken and their ripple voltage is then calculated. Based on this ripple voltage and the parallel modulation function, a detailed control structure can be obtained. Finally, the pulse width modulation control signal of the switching device is generated according to the method shown in fig. 3.
And (3) taking each phase as a reference, and realizing closed-loop control by adopting a simple PI controller. Fig. 4 is a basic PI control block diagram of a decoupling circuit according to an embodiment of the present application.
Fig. 5 is a control block diagram of a single-phase inverter provided in an embodiment of the present application. The output filter is designed as an LC filter. The P and I parameters can be conveniently designed based on the control module.
The open loop transfer function is as follows:
Figure BDA0002887865100000091
l and C are LC filter parameters. R is the load and R is the parasitic parameter of the inductance. GpiIs a PI controller, KpwmIs the ratio of the output voltage of the single-phase inverter to the supply voltage Vin of the dc power supply.
The open-loop and closed-loop Berde plot analyses show that the open-loop amplitude margin and the open-loop phase margin are 28.3db and infinity, respectively. After PI compensation, the closed loop phase margin is 82.5 degrees. Therefore, the single-phase inverter provided by the embodiment of the application has good steady-state and dynamic performances.
The single-phase inverter that this application embodiment provided, through DC power supply, direct current bus-bar capacitance, converting circuit and decoupling circuit, can use littleer direct current bus-bar capacitance under the condition that does not influence reduction direct current link ripple voltage, avoided the problem that the life of single-phase inverter is shorter because of direct current bus-bar capacitance's capacitance value is too high and causes to improve user's use and experience.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above description is merely one or more embodiments of the present disclosure and is not intended to limit the present disclosure. Various modifications and alterations to one or more embodiments of the present description will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification should be included in the scope of the claims of the present specification.

Claims (7)

1. A single-phase inverter, comprising:
a direct current power supply;
the direct current bus capacitor is connected between the positive electrode and the negative electrode of the direct current power supply;
the conversion circuit is connected with the direct current bus capacitor in parallel; the conversion circuit comprises a plurality of switches, the switches form two conversion branches which are connected in parallel, and each conversion branch is formed by connecting two switches in series; the connection point of the two switches in each conversion branch is used as an output node of the single inverter;
a decoupling circuit connected in series between the DC bus capacitor and the conversion circuit and comprising at least a plurality of switches, at least one first capacitor, and at least one first inductor; a plurality of switches in the decoupling circuit form a first decoupling branch, a second decoupling branch and a third decoupling branch, and the first decoupling branch, the second decoupling branch and the third decoupling branch are formed by connecting two switches in series; the capacitor, the first decoupling branch, the second decoupling branch and the third decoupling branch are connected in series; and a first inductor is connected between the second decoupling branch and the third decoupling branch.
2. The single-phase inverter of claim 1, wherein the decoupling circuit further comprises a second capacitor and a second inductor;
one end of the second capacitor is connected to a first output node of the decoupling branch, and the first output node of the decoupling circuit is a connection point of two switches in the third decoupling branch;
the other end of the second capacitor is connected with a second output node of the decoupling circuit through the second inductor; the second output node of the decoupling circuit is the connection point of the two switches in the first decoupling branch.
3. The single-phase inverter of claim 1, wherein the conversion circuit further comprises two third inductors, at least one third capacitor, and at least one first load;
the two third inductors are respectively connected with one output node of the single-phase inverter and are connected through the at least one third capacitor;
the first load is connected in parallel to two ends of the third capacitor.
4. The single-phase inverter of claim 1, wherein the switch comprises a MOS transistor and a diode, and the MOS transistor is connected in reverse with the diode.
5. The method of claim 1, wherein the single-phase inverter further comprises a second load;
one end of the second load is connected with the anode of the direct current power supply, and the other end of the second load is connected with the direct current bus capacitor.
6. The single-phase inverter of claim 5, further comprising: the control unit is connected with the direct-current power supply and the switches;
the control unit is used for sampling the direct current link voltage and calculating the ripple voltage of the direct current link voltage; the direct-current link voltage refers to the voltage at two ends of a branch circuit formed by connecting the direct-current power supply and the second load in series;
and
and the control unit is used for generating a pulse width modulation control signal corresponding to a switch in the decoupling circuit according to the calculated ripple voltage of the direct current link voltage and a preset modulation mode, so that the switch is switched on or switched off.
7. The single-phase inverter of claim 6, wherein the pulse width modulation control signal corresponding to the switch in the decoupling circuit is generated according to the calculated ripple voltage of the dc link voltage and a preset modulation scheme, and is obtained by using the following formula:
Figure FDA0002887865090000021
Figure FDA0002887865090000022
Figure FDA0002887865090000023
wherein, theapFor the pulse width modulation control signal of the switch in the first decoupling branch, mbpFor the pulse width modulated control signal of the switches in the second decoupling branch, mcpFor the pulse width modulated control signal of the switches in the third coupling branch, vaIs the voltage of the second output node of the decoupling circuit, vaFor the voltages at the junction of the two switches in the first decoupling branch, said VinIs the supply voltage of the dc power supply.
CN202110019281.5A 2021-01-07 2021-01-07 Single-phase inverter Active CN112910296B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110019281.5A CN112910296B (en) 2021-01-07 2021-01-07 Single-phase inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110019281.5A CN112910296B (en) 2021-01-07 2021-01-07 Single-phase inverter

Publications (2)

Publication Number Publication Date
CN112910296A true CN112910296A (en) 2021-06-04
CN112910296B CN112910296B (en) 2022-11-29

Family

ID=76112373

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110019281.5A Active CN112910296B (en) 2021-01-07 2021-01-07 Single-phase inverter

Country Status (1)

Country Link
CN (1) CN112910296B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5852558A (en) * 1997-06-20 1998-12-22 Wisconsin Alumni Research Foundation Method and apparatus for reducing common mode voltage in multi-phase power converters
CN103023360A (en) * 2012-07-03 2013-04-03 中南大学 Single-phase alternating current (AC)/ direct current (DC) converter with secondary fluctuating power decoupling and control method thereof
CN103401463A (en) * 2013-07-25 2013-11-20 天津大学 Miniature photovoltaic grid-connected inverter with optimized DC (Direct Current) bus capacitor and control method
CN103606956A (en) * 2013-11-29 2014-02-26 河北工业大学 Power decoupling circuit for photovoltaic grid-connected inverter
CN105226925A (en) * 2015-11-02 2016-01-06 南京航空航天大学 A kind of inverse-excitation type single-phase inverter and control method thereof
CN105429448A (en) * 2015-11-11 2016-03-23 阳光电源股份有限公司 Single-phase inverter and DC bus ripple suppression method thereof
CN110380626A (en) * 2019-06-21 2019-10-25 山东大学 The single-phase Cascade H bridge rectifier of high power density, control method and control system
CN111969878A (en) * 2020-06-23 2020-11-20 湖南大学 Converter, and control method and device for converter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5852558A (en) * 1997-06-20 1998-12-22 Wisconsin Alumni Research Foundation Method and apparatus for reducing common mode voltage in multi-phase power converters
CN103023360A (en) * 2012-07-03 2013-04-03 中南大学 Single-phase alternating current (AC)/ direct current (DC) converter with secondary fluctuating power decoupling and control method thereof
CN103401463A (en) * 2013-07-25 2013-11-20 天津大学 Miniature photovoltaic grid-connected inverter with optimized DC (Direct Current) bus capacitor and control method
CN103606956A (en) * 2013-11-29 2014-02-26 河北工业大学 Power decoupling circuit for photovoltaic grid-connected inverter
CN105226925A (en) * 2015-11-02 2016-01-06 南京航空航天大学 A kind of inverse-excitation type single-phase inverter and control method thereof
CN105429448A (en) * 2015-11-11 2016-03-23 阳光电源股份有限公司 Single-phase inverter and DC bus ripple suppression method thereof
CN110380626A (en) * 2019-06-21 2019-10-25 山东大学 The single-phase Cascade H bridge rectifier of high power density, control method and control system
CN111969878A (en) * 2020-06-23 2020-11-20 湖南大学 Converter, and control method and device for converter

Also Published As

Publication number Publication date
CN112910296B (en) 2022-11-29

Similar Documents

Publication Publication Date Title
Ellabban et al. Comparison between different PWM control methods for different Z-source inverter topologies
CN111064359A (en) Wide-range bidirectional conversion circuit and control method
CN110798074B (en) Cascade type single-phase alternating current-to-direct current isolation converter
Fan et al. A novel active power decoupling method for single-phase photovoltaic or energy storage applications
CN105191100A (en) Bidirectional DC-to-DC converter
US20230223861A1 (en) Electrical power converter
CN112202322B (en) Method for inhibiting secondary ripple current based on equivalent zero impedance of active negative capacitor
CN110572069B (en) Bidirectional DC-AC converter
US20230238876A1 (en) Electrical power converter
CN103780118A (en) Resonant DC link three-level soft switching inverter circuit
Zhang et al. Three-Level PWM rectifier based high efficiency batteries charger for EV
Qin et al. A high power density power factor correction front end based on a 7-level flying capacitor multilevel converter
CN112910296B (en) Single-phase inverter
Gabriel et al. Input current shaping of five-level multiple-pole VIENNA rectifier topologies with reduced component and better performance
Babaei et al. A new structure of quasi Z-source-based cascaded multilevel inverter
Alsolami et al. DC ripple current reduction on multilevel, multiport, single-phase DC/AC converter for renewable energy applications
Li et al. Dual buck based power decoupling circuit for single phase inverter/rectifier
CN115149807A (en) Multilevel DC converter, voltage control method and control device of flying capacitor
Roggia et al. Comparison between full-bridge-forward converter and DAB converter
Bhowmik et al. State space analysis and duty cycle control of a switched reactance based center-point-clamped reactive power compensator
Liao et al. Control and modulation of a bipolar multi-level active power pulsation buffer for single-phase converters
Ranjan et al. Analysis of Dual Active Bridge Converter in Dual-Phase-Shift mode using Pulse-Width Modulation Technique
Huang et al. An automatic power decoupling control method on three level DC-AC converter to suppress the double-line-frequency ripple
Zhu et al. An efficiency improved single-phase PFC converter for electric vehicle charger applications
Nandi et al. A comprehensive overview of active power decoupling-integrated switched boost inverters

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant