CN112910296B - Single-phase inverter - Google Patents

Single-phase inverter Download PDF

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Publication number
CN112910296B
CN112910296B CN202110019281.5A CN202110019281A CN112910296B CN 112910296 B CN112910296 B CN 112910296B CN 202110019281 A CN202110019281 A CN 202110019281A CN 112910296 B CN112910296 B CN 112910296B
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decoupling
branch
switches
circuit
capacitor
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CN112910296A (en
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于功山
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Yuanshan Jinan 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
    • H02M7/53—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

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

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, the two conversion branches 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-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 networks and the like. In order to realize a single-phase inverter with high power density, an output filter and a dc link capacitor are two passive devices 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 influence the use experience of users. Therefore, how to adopt a capacitor with a smaller capacitance value to meet the requirement of absorbing pulse power by twice fundamental frequency is realized, so that the service life of the inverter is longer, and the problem which is urgently needed to be solved by a single-phase inverter is solved.
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 the fact that the capacity of a direct-current bus capacitor in the existing single-phase inverter is too large.
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 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 all 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 junction 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 plurality of 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 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 through calculation and a preset modulation manner, and is specifically obtained through the following formula:
Figure 134258DEST_PATH_IMAGE001
Figure 582557DEST_PATH_IMAGE002
Figure 283666DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 413296DEST_PATH_IMAGE005
for the pulse width modulated control signals of the switches in the first decoupling branch,
Figure 758827DEST_PATH_IMAGE007
for the pulse width modulated control signals of the switches in the second decoupling branch,
Figure 253393DEST_PATH_IMAGE009
for the pulse width modulated control signals of the switches in the third coupling branch,
Figure 254847DEST_PATH_IMAGE011
for the voltage of the second output node of the decoupling circuit,
Figure 250485DEST_PATH_IMAGE011
for the voltages at the connection points of the two switches in the first decoupling branch,
Figure 76621DEST_PATH_IMAGE012
is the supply voltage of the dc power supply.
The embodiment of the application provides a single-phase inverter, through the cooperation between DC power supply, direct current bus capacitance, converting circuit and 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 the direct current bus capacitance among the traditional inverter, avoided the short problem of life of single-phase inverter because of the capacitance value of direct current bus capacitance is too high and cause 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 specification 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 according to an embodiment of the present disclosure;
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 according to 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
Figure 804405DEST_PATH_IMAGE013
A switching circuit 110, a decoupling circuit 120, a second load
Figure 89893DEST_PATH_IMAGE014
。
The DC power supply may be a battery or an AC/DC converter.
As shown in fig. 1, the dc bus capacitor
Figure 499009DEST_PATH_IMAGE013
Connected between the positive and negative poles of a DC power supply DC, the second load
Figure 553553DEST_PATH_IMAGE014
One 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
Figure 717818DEST_PATH_IMAGE013
And (4) connecting. The conversion circuit 110 and the dc bus capacitor
Figure 880815DEST_PATH_IMAGE013
Parallel decoupling circuit 120 is connected in series with DC bus capacitor
Figure 890359DEST_PATH_IMAGE015
And the conversion circuit 110.
Specifically, as shown in fig. 1, the decoupling branch 120 includes: a plurality of switches, at least one first capacitor
Figure 64988DEST_PATH_IMAGE016
And at least one first inductor
Figure 72259DEST_PATH_IMAGE017
。
Wherein, the plurality of switches in the decoupling circuit 120 form a first decoupling branch, a second decoupling branch and a third decoupling circuit, and the first decoupling branch, the second decoupling branch and the third decoupling are all formed by connecting two switches in series, and the first capacitor
Figure 332339DEST_PATH_IMAGE016
The 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 inductor is connected between the second decoupling branch and the third decoupling branch
Figure 145574DEST_PATH_IMAGE017
First inductance
Figure 66388DEST_PATH_IMAGE017
The 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.
Further, the decoupling circuit 120 further includes a second inductor
Figure 572455DEST_PATH_IMAGE018
And a second capacitor
Figure 319831DEST_PATH_IMAGE015
. Second inductor
Figure 608861DEST_PATH_IMAGE018
Is connected to the second output node a of the decoupling branch 120, a second inductance
Figure 695766DEST_PATH_IMAGE018
The other end of the first capacitor passes through a second capacitor
Figure 435052DEST_PATH_IMAGE015
To the first output node c of the decoupling branch 120.
The conversion circuit 110 includes a plurality of switches, two third inductors
Figure 528779DEST_PATH_IMAGE020
At 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 series. 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 inductor
Figure 683817DEST_PATH_IMAGE020
Respectively with a single phaseAn output node of the inverter is connected, and a third inductor
Figure 953124DEST_PATH_IMAGE022
And a third inductance
Figure 473098DEST_PATH_IMAGE023
Connected 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 the embodiment of the present application, under the same condition, the dc bus capacitor having the same capacitance value, compared with the prior art, the technical scheme provided by the embodiment of the present application can more effectively reduce the ripple voltage of the dc link. 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 when the dc link ripple voltage is reduced 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 anti-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 application, the silicon carbide diode can obtain higher switching frequency relative to the gallium nitride diode, and the characteristics of the silicon carbide diode do not change greatly compared with the gallium nitride diode along with the increase of the temperature.
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 embodiment of the present application, the output ac voltage
Figure 132750DEST_PATH_IMAGE025
And current
Figure 153795DEST_PATH_IMAGE026
Given by equations (1) and (2), respectively:
Figure 372549DEST_PATH_IMAGE027
(1)
Figure 391321DEST_PATH_IMAGE028
(2)
wherein V is the voltage of the load connected with the output node of the single-phase inverter, and I is the magnitude of the current provided by the single-phase inverter,
Figure 600585DEST_PATH_IMAGE030
is the angular frequency of the single-phase inverter,
Figure 35109DEST_PATH_IMAGE032
is the power factor angle.
Then, the instantaneous power output by the single-phase inverter is given by equation (3):
Figure 951112DEST_PATH_IMAGE033
(3)
DC bus capacitor
Figure 937523DEST_PATH_IMAGE013
Derivable as (4):
Figure 493138DEST_PATH_IMAGE034
(4)
wherein the content of the first and second substances,
Figure 793669DEST_PATH_IMAGE035
is the rated power of the single-phase inverter,
Figure 626496DEST_PATH_IMAGE036
is the voltage of the direct current link and,
Figure 659174DEST_PATH_IMAGE037
is 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.
Figure 780714DEST_PATH_IMAGE038
(5)
Figure 681674DEST_PATH_IMAGE039
(6)
Wherein, the first and the second end of the pipe are connected with each other,
Figure 995106DEST_PATH_IMAGE041
and
Figure 526581DEST_PATH_IMAGE042
is the magnitude of the series voltage and current. Because the voltage ripple of the direct current link is second harmonic wave, the direct current link has the advantages of high efficiency, low cost and low cost
Figure 932155DEST_PATH_IMAGE043
With the same angular frequency. For the decoupling circuit 120, the load has only one second capacitor
Figure 512172DEST_PATH_IMAGE015
Time, current
Figure 54012DEST_PATH_IMAGE044
Can be derived from (7):
Figure 756388DEST_PATH_IMAGE045
(7)
thus, the instantaneous power provided by the decoupling circuit 120 is given by (8):
Figure 773892DEST_PATH_IMAGE046
(8)
from equation (8), the instantaneous power of the decoupling circuit 120 is known
Figure 219917DEST_PATH_IMAGE047
There is no real power for a period of time. First capacitance of decoupling circuit 120
Figure 616263DEST_PATH_IMAGE016
Only the reactive power of the dc link can be absorbed.
Similar to the DC bus capacitance, the first capacitor in the decoupling circuit 120
Figure 427224DEST_PATH_IMAGE016
But 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 switch device is not ideal, the filter inductance and the capacitor have some parasitic parameters, and the second capacitor
Figure 745073DEST_PATH_IMAGE015
May be present, 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
Figure 791526DEST_PATH_IMAGE043
A small amount of direct current component is injected,
Figure 945776DEST_PATH_IMAGE043
the following can be defined:
Figure 989955DEST_PATH_IMAGE049
(9)
wherein, the first and the second end of the pipe are connected with each other,
Figure 591838DEST_PATH_IMAGE051
is a dc component and the corresponding value is small.
The instantaneous power then changes as follows:
Figure 317348DEST_PATH_IMAGE052
(10)
according to equation (10), the first capacitance
Figure 891549DEST_PATH_IMAGE016
With second and fourth harmonic voltage ripples. The magnitude of the fourth harmonic is much larger than the second harmonic order.
The use of the decoupling circuit 120 as shown in fig. 1 further reduces the first capacitance due to the presence of the 4 th harmonic voltage ripple in the decoupling circuit 120
Figure 168947DEST_PATH_IMAGE016
And further increases the power density.
For the decoupling circuit 120, the voltage and current equations are assumed as follows:
Figure 195808DEST_PATH_IMAGE053
(11)
Figure 708698DEST_PATH_IMAGE054
(12)
based on the spatial vectorial calculation, the total instantaneous power using the decoupling circuit 120 in fig. 1 can be represented as (13):
Figure 199722DEST_PATH_IMAGE055
(13)
in order to reduce the first capacitance
Figure 257808DEST_PATH_IMAGE016
A first capacitor
Figure 37546DEST_PATH_IMAGE016
The fourth harmonic order voltage ripple in the inductor is transferred to the second inductor
Figure 229492DEST_PATH_IMAGE018
This means that the above equation is equal to zero. Then according to the second inductance
Figure 935543DEST_PATH_IMAGE018
The relationship between the upper voltage and the current, and the second inductance is calculated by the equation (14)
Figure 758005DEST_PATH_IMAGE018
Key value of (c):
Figure 821776DEST_PATH_IMAGE057
(14)
Figure 755097DEST_PATH_IMAGE059
the second inductor has a low rated power and a frequency twice that of the conventional parallel connection mode
Figure 564921DEST_PATH_IMAGE018
Can 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), and the control unit is 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 that
Figure 620602DEST_PATH_IMAGE011
Is a reference voltage for the output voltage of the decoupling circuit 120,
Figure 30723DEST_PATH_IMAGE060
is the second inductor shown in fig. 1
Figure 502156DEST_PATH_IMAGE018
The reference voltage of (1). The pulse width modulated control signal for the switches on each leg in the decoupling circuit 120 is given by the following equation (15):
Figure 822279DEST_PATH_IMAGE001
Figure 986544DEST_PATH_IMAGE061
(15)
Figure 369115DEST_PATH_IMAGE062
wherein the content of the first and second substances,
Figure 706555DEST_PATH_IMAGE005
for the pulse width modulated control signals of the switches in the first decoupling branch not connected to the first inductor,
Figure 84447DEST_PATH_IMAGE007
for the pulse width modulated control signals of the switches in the second decoupling branch,
Figure 576871DEST_PATH_IMAGE009
a pulse width modulated control signal for the switches in the first decoupling branch to which the first inductor is connected,
Figure 102530DEST_PATH_IMAGE064
for the voltage of the second output node of the decoupling circuit,
Figure 587869DEST_PATH_IMAGE011
for the voltages at the junction of the two switches in the second decoupling branch,
Figure 820267DEST_PATH_IMAGE065
is 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, the dc link voltage shown in fig. 1 is applied
Figure 123073DEST_PATH_IMAGE066
Samples 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 pwm control signal for the switching device is generated according to the method shown in fig. 3.
The curvelet = = each phase is used as a reference, and a simple PI controller is adopted to realize closed-loop control. Fig. 4 is a basic PI control block diagram of a decoupling circuit provided in 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 73711DEST_PATH_IMAGE067
(16)
l and C are LC filter parameters. R is the load and R is the parasitic parameter of the inductance.
Figure 877588DEST_PATH_IMAGE069
Is a PI controller, which is used for controlling the power supply,
Figure 761230DEST_PATH_IMAGE071
is a sheetThe ratio of the output voltage of the 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 intended to represent one or more embodiments of the present disclosure, and should not be taken to be limiting of 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 or the like 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 (2)

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 circuit is used as an output node of the single-phase inverter;
a decoupling circuit connected in series between the dc bus capacitance and the conversion circuit and comprising at least a plurality of switches, at least one first capacitance, and at least one first inductance; 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 with one another; a first inductor is connected between the second decoupling branch and the third decoupling branch;
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; a second output node of the decoupling circuit is a connection point of the two switches in the first decoupling branch;
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 the two third inductors are connected through the at least one third capacitor;
the first load is connected in parallel to two ends of the third capacitor;
the single-phase inverter further comprises a second load; one end of the second load is connected with the positive electrode of the direct-current power supply, and the other end of the second load is connected with the direct-current bus capacitor;
the single-phase inverter further includes: 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
the control unit is configured to generate a pulse width modulation control signal corresponding to a switch in the decoupling circuit according to the calculated ripple voltage of the dc link voltage and a preset modulation mode, so that the switch is turned on or off, and specifically includes:
Figure FDA0003819403630000021
Figure FDA0003819403630000022
Figure FDA0003819403630000023
wherein, m is ap For the pulse width modulated control signal of the switch in the first decoupling branch, m bp For the pulse width modulated control signal of the switch in the second decoupling branch, said m cp For the pulse width modulated control signal of the switch in the third decoupling branch, v a Is the voltage of the second output node of the decoupling circuit, v a For the voltages at the junction of the two switches in the first decoupling branch, said V in Is the supply voltage of the dc power supply.
2. 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.
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