CN117477974B - Common-ground type switch capacitor five-level inverter - Google Patents

Common-ground type switch capacitor five-level inverter Download PDF

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Publication number
CN117477974B
CN117477974B CN202311815205.0A CN202311815205A CN117477974B CN 117477974 B CN117477974 B CN 117477974B CN 202311815205 A CN202311815205 A CN 202311815205A CN 117477974 B CN117477974 B CN 117477974B
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China
Prior art keywords
power switch
switch tube
capacitor
diode
level
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CN117477974A (en
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吕绪良
李晓鹏
任宇航
任宇珂
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Zhejiang Shangyue New Energy Development Co ltd
Nanjing Yunhai Photoelectric Technology Co ltd
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Zhejiang Shangyue New Energy Development Co ltd
Nanjing Yunhai Photoelectric 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

Abstract

The invention relates to a common-ground type switch capacitor five-level inverter, which comprises an inverter unit and an auxiliary branch circuit; the auxiliary branch comprises: power switch tubePower switch tubePower switch tubeDiodeCapacitance. The beneficial effects of the invention are as follows: the capacitors of the inverter unit and the auxiliary branch are used for supplying power to the load respectively, so that five-level output is realized. Diode in auxiliary branchCapacitancePower switch tubeThe charging circuit is used for providing a charging loop for the capacitor in the inverter unit, and reduces voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced, and the power density and the reliability of the power supply can be greatly improved; the common-ground type switch capacitor five-level inverter has the advantages of small capacitance, high power density and large voltage gain adjustment capability, and is suitable for application scenes such as flexible photovoltaic power generation and the like with wide range of high power density. Meanwhile, the input and output of the inverter are grounded together, so that leakage current from an input power supply to a load end can be eliminated, and safety and performance of photovoltaic power generation and other application occasions are improved.

Description

Common-ground type switch capacitor five-level inverter
Technical Field
The invention relates to the field of power converters, in particular to a common-ground type switch capacitor five-level inverter.
Background
Compared with a two-level inverter, the multi-level inverter (MLI) is a solution more suitable for low/medium power application, and is widely applied to the industrial fields such as variable speed motor drive, UPS systems, reactive compensators, electric automobiles and the like.
For renewable energy source application, especially in the field of high-performance flexible photovoltaic power generation, the battery has the characteristics of wide power generation power range, large voltage variation range and the like. In addition, the flexible photovoltaic cell is light in volume and is often used for occasions such as unmanned aerial vehicles, and the interface power supply has the characteristics of high power density, light weight, wide voltage gain adjustment range and the like besides the conventional photovoltaic power supply function.
In the multilevel inverter, the capacitor of the switched capacitor inverter needs to be continuously discharged during the working period, and in order to reduce the ripple of the capacitor and improve the output voltage quality, a large capacitor (more than millifarads) needs to be adopted. The adoption of a large capacitor can bring about large volume and limited service life of a device, so that the service life and the volume of a power supply can be influenced. Therefore, how to reduce the capacitance of the capacitor is a critical issue in improving the performance of the switched-capacitor multi-level inverter.
Disclosure of Invention
The invention aims to provide a common-ground type switch capacitor five-level inverter aiming at the defects of the traditional switch capacitor multi-level inverter. The capacitors of the inverter unit and the auxiliary branch are used for supplying power to the load respectively, so that five-level output is realized. Diode in auxiliary branchCapacitance->Power switch tube->The capacitor charging circuit is used for providing a charging loop for the capacitor in the inverter unit and reducing the voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced, and the power density and the reliability of the power supply can be greatly improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a common-ground type switch capacitor five-level inverter comprises an inverter unit and an auxiliary branch circuit;
the inverter unit includes: DC power supply and power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Diode->Diode->Inductance->Inductance->Capacitance->Capacitance->Capacitance->Capacitance->；
Positive end and inductance of DC power supplyIs connected to the first end of the housing; negative terminal and capacitor of DC power supply>Second terminal of (2) power switch tube->Second terminal of (2) power switch tube->Second terminal of (2) power switch tube->Is the first end, output port->Is connected to the second end of the inverter unit and constitutes a 2-port of the inverter unit; the negative end of the direct current power supply is grounded; inductance->Second terminal of (d) and capacitorSecond terminal of (2) diode->Is connected to the first end of the housing; capacitance->Is>Second end of (2) inductanceIs connected to the first end of the housing; inductance->Is a second terminal of (2) and a power switch tube->Is a first terminal, capacitance->Is a first terminal, a diodeIs connected to the first end of the inverter unit and constitutes a 3-port of the inverter unit; diode->Is a second terminal and a capacitance->Is a power switch tube>Is connected to the first end of the housing; power switch tube->Is a second terminal and a capacitance->Second terminal of (2) power switch tube->Is connected to the first end of the housing; power switch tube->Is a second terminal of (2) and a power switch tube->Is a first terminal, capacitance->Is a power switch tube>Is connected to the first end of the housing; capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the second end of the first member; power switch tube->Is a second terminal of (2) and a power switch tube->Second terminal, output port->Is connected to the first end of the inverter unit and constitutes a 1 port of the inverter unit;
the auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Diode->Capacitance->；
Power switch tubeIs connected to the 1 port of the inverter unit; power switch tube->Is>Is a first terminal, capacitance->Is connected to the second end of the first member; diode->Is a second terminal of (2) and a power switch tube->Is connected with the second end of the inverter unit and the 2 port of the inverter unit; power switch tube->Is>Is a power switch tube>Is connected to the second end of the first member; power switch tube->Is connected to the 3-port of the inverter unit.
As a further scheme of the invention: power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Is a fully controlled device;
power switch tubePower switch tube->Power switch tube->Power switch tube->Is a bidirectional voltage-resistant fully-controlled device.
As a further scheme of the invention: a common-ground type switch capacitor five-level inverter is controlled by adopting a sine pulse width modulation mode.
As a further scheme of the invention: each voltage level of the common-ground type switch capacitor five-level inverter has at least two working modes; switching between different modes of operation occurs during each voltage level output.
As a further scheme of the invention: the output voltage of the common-ground type switch capacitor five-level inverter has five voltage levels, namely zero level, positive one level, positive two level, negative one level and negative two level.
As a further scheme of the invention: when the output voltage is zero level, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switching tube、/>、/>、/>、/>And diode->、/>Conducting; power switch tube->、/>、/>、/>、/>And diode->Disconnecting; capacitance->、/>、/>And->Charging; capacitance->Discharging; inductance->、/>Discharging;
in the second working mode, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; inductance->、/>Charging; capacitance->And->And (5) discharging.
As a further scheme of the invention: when the output voltage is positive one level, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting; power switch tube、/>、/>、/>、/>And->Disconnecting; capacitance->、/>、/>And->Charging; inductance->、/>Discharging;
in the second working mode, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; inductance->、/>Charging; capacitance->、/>And->And (5) discharging.
As a further scheme of the invention: when the output voltage is in a positive two-level state, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switch tube、/>、/>、/>、/>And diode->、/>Conducting; power switch tube、/>、/>、/>、/>And diode->Disconnecting; capacitance->、/>And->Charging; capacitance->Inductance->、/>Discharging;
in the second working mode, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; inductance->、/>Charging; capacitance->、/>And->And (5) discharging.
As a further scheme of the invention: when the output voltage is negative one level, the common-ground type switch capacitor five-level inverter has four working modes;
in a first mode of operation, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting; power switch tube、/>、/>、/>、/>And->Disconnecting; capacitance->、/>、/>And->Charging; capacitance->Inductance->、/>Discharging;
in the second working mode, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; capacitance->Charging; inductance->、/>Charging; capacitance->、/>And->Discharging;
in a third mode of operation, the power switch tube、/>、/>、/>、/>And diode->Conducting; power switch tube->、、/>、/>、/>And diode->、/>Disconnecting; capacitance->、/>And->Charging; capacitance->、/>Discharging; inductance->、/>Discharging;
in a fourth mode of operation, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; inductance->、/>Charging; capacitance->、/>And->And (5) discharging.
As a further scheme of the invention: when the output voltage is in a negative two-level state, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting; power switch tube、/>、/>、/>、/>And->Disconnecting; capacitance->、/>、/>And->Charging; capacitance->Inductance->、/>Discharging;
in the second working mode, the power switch tube、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And diode->、/>、/>Disconnecting; inductance->、/>Charging; capacitance->、/>And->And (5) discharging.
Compared with the prior art, the invention has the beneficial effects that: the capacitors of the inverter unit and the auxiliary branch are used for supplying power to the load respectively, so that five-level output is realized. Diode in auxiliary branchCapacitance->Power switch tube->The capacitor charging circuit is used for providing a charging loop for the capacitor in the inverter unit and reducing the voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced, and the power density and the reliability of the power supply can be greatly improved.
The common-ground type switch capacitor five-level inverter has the advantages of small capacitance, high power density and large voltage gain adjustment capability, and is suitable for application scenes such as flexible photovoltaic power generation and the like with wide range of high power density. Meanwhile, the input and output of the inverter are grounded together, so that leakage current from an input power supply to a load end can be eliminated, and safety and performance of photovoltaic power generation and other application occasions are improved.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
Drawings
FIG. 1 is a circuit diagram of a common-ground switched-capacitor five-level inverter of the present invention;
FIG. 2 is an output waveform of the common-mode switched-capacitor five-level inverter of FIG. 1 in a sinusoidal pulse width modulation mode;
FIG. 3a is a schematic diagram of a first mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is zero, the current trend being shown by the arrow;
FIG. 3b is a schematic diagram of a second mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is zero, the current trend being shown by the arrow;
FIG. 3c is a schematic diagram of a first mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is at a positive level, the current trend being shown by the arrow;
FIG. 3d is a schematic diagram of a second mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is at a positive level, the current trend being shown by the arrow;
FIG. 3e is a schematic diagram of a first mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is at a positive two level, with the current trend shown by the arrow;
FIG. 3f is a schematic diagram of a second mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is at a positive two level, with the current trend shown by the arrow;
FIG. 3g is a schematic diagram of a first mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is negative, with the current trend shown by the arrow;
FIG. 3h is a schematic diagram of a second mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is negative, the current trend being shown by the arrow;
FIG. 3i is a schematic diagram of a third mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is negative, the current trend being shown by the arrow;
FIG. 3j is a schematic diagram of a fourth mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is negative, with the current trend shown by the arrow;
FIG. 3k is a schematic diagram of a first mode of operation in which the output voltage of the common-mode switched-capacitor five-level inverter of FIG. 1 is negative two levels, with the current trend shown by the arrows;
fig. 3l is a schematic diagram of a second operation mode in which the output voltage of the common-mode switched-capacitor five-level inverter in fig. 1 is negative two, and the current trend is shown by an arrow.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a common-ground type switched capacitor five-level inverter includes an inverter unit and an auxiliary branch.
The inverter unit includes: DC power supply and power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Diode->Diode->Inductance->Inductance->Capacitance->Capacitance->Capacitance->Capacitance->。
Positive end and inductance of DC power supplyIs connected to the first end of the housing. Negative terminal and capacitor of DC power supply>Second terminal of (2) power switch tube->Second terminal of (2) power switch tube->Second terminal of (2) power switch tube->Is the first end, output port->Is connected to and constitutes the 2-port of the inverter unit. The negative end of the direct current power supply is grounded. Inductance->Second terminal of (d) and capacitorSecond terminal of (2) diode->Is connected to the first end of the housing. Capacitance->Is>Second end of (2) inductanceIs connected to the first end of the housing. Inductance->Is a second terminal of (2) and a power switch tube->Is a first terminal, capacitance->Is a first terminal, a diodeIs connected to and constitutes the 3-port of the inverter unit. Diode->Is a second terminal and a capacitance->Is a power switch tube>Is connected to the first end of the housing. Power switch tube->Is a second terminal and a capacitance->Second terminal of (2) power switch tube->Is connected to the first end of the housing. Power switch tube->Is a second terminal of (2) and a power switch tube->Is a first terminal, capacitance->Is a power switch tube>Is connected to the first end of the housing. Capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the second end of the first connector. Power switch tube->Is a second terminal of (2) and a power switch tube->Second terminal, output port->Is connected to and constitutes a 1 port of the inverter unit.
Power switch tubeIs a second terminal of (2) and a power switch tube->Is connected to the second terminal of (2) and forms an output port with ground +.>. The inverter unit is provided with 1, 2 and 3 ports for connection with the auxiliary branch.
The auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Diode->Capacitance->。
Power switch tubeIs connected to the 1 port of the inverter unit. Power switch tube->Is>Is a first terminal, capacitance->Is connected to the second end of the first connector.
DiodeIs a second terminal of (2) and a power switch tube->Is connected to the second end of the inverter unit at the 2 port. Power switch tube->Is>Is a power switch tube>Is connected to the second end of the first connector. Power switch tube->Is connected to the 3-port of the inverter unit.
As a specific embodiment, the power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Is a fully controlled device. Power switch tube->Power switch tube->Power switch tube->Power switch tube->Is a bidirectional voltage-resistant fully-controlled device. Referring to fig. 1 and 3a, power switch tube +.>Can be regarded as being formed by a power switch tube>And->The composition is formed. Power switch tube->Can be regarded as being formed by a power switch tube>And->The composition is formed. Power switch tube->Can be regarded as being formed by a power switch tube>And->The composition is formed. Power switch tube->Can be regarded as being formed by a power switch tube>And->The composition is formed.
A common-ground type switch capacitor five-level inverter is controlled by adopting a sine pulse width modulation mode. Referring to fig. 2, an output waveform of the common-ground type switched capacitor five-level inverter in a sinusoidal pulse width modulation mode is shown.
As a preferred embodiment, a common-ground switched capacitor five-level inverter has at least two modes of operation per voltage level. Switching is performed between different operation modes during each voltage level output period, so that input current continuity is realized.
The output voltage of the common-ground type switch capacitor five-level inverter has five voltage levels, namely zero level, positive one level, positive two level, negative one level and negative two level. Zero level output voltage. Positive one level output voltage +>. Positive two-level output voltage +.>. Negative one level output voltage +>. Negative two-level output voltage +.>。/>。/>Is the voltage of the direct current power supply. />Ts is the switching period, +.>The charge time is inductive for each switching cycle.
When the output voltage is zero level, the common-ground type switch capacitor five-level inverter has two working modes.
In a first mode of operation, as shown in FIG. 3a, the power switch tube、/>、/>、/>、/>And diode->、/>Conducting. Power switch tube->、/>、/>、/>、/>And diode->And (5) disconnecting. Capacitance->、/>、/>And->And (5) charging. Capacitance->And (5) discharging. Inductance、/>And (5) discharging. The DC power supply voltage is +.>. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give the capacitor->Charge to->DC power supply series inductance +.>Give the capacitor->Charge to->DC power supply series inductance +.>And capacitance->Give the capacitor->Charge to->Power switch tube->、/>Forming a closed loop as a loadAnd a freewheel path is provided to realize zero-level output.
In the second workIn mode, as shown in FIG. 3b, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、、/>、/>、/>And diode->、/>、/>And (5) disconnecting. Inductance->、/>And (5) charging. Capacitance->And->And (5) discharging. DC power supply series capacitor->Inductance->Charging, capacitance->Inductance->Charging, power switch tube->、/>Form a closed loop, which is a load->And a freewheel path is provided to realize zero-level output.
When the output voltage is at a positive level, the common-ground type switch capacitor five-level inverter has two working modes.
In a first mode of operation, as shown in FIG. 3c, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting. Power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. Capacitance->、/>、/>And->And (5) charging. Inductance->、/>And (5) discharging. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give->Charge to->DC power supply series inductanceGive the capacitor->Charge to->At the same time give load->And supplying power to realize positive one-level output.
In a second mode of operation, as shown in FIG. 3d, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、/>、、/>、/>And diode->、/>、/>And (5) disconnecting. Inductance->、/>And (5) charging. Capacitance->、/>And->And (5) discharging. DC power supply series capacitor->Inductance->Charging, capacitance->Inductance->Charging, capacitance->Give load->And supplying power to realize positive one-level output.
When the output voltage is in a positive two-level state, the common-ground type switch capacitor five-level inverter has two working modes.
In a first mode of operation, as shown in FIG. 3e, the power switch tube、/>、/>、/>、/>And diode->、/>Conducting. Power switch tube->、/>、/>、/>、/>And diode->And (5) disconnecting. Capacitance->、/>And->And (5) charging. Capacitance->Inductance->、/>And (5) discharging. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give the capacitor->Charge to->DC power supply series inductance +.>Give the capacitor->Charge to->DC power supply series inductance +.>And capacitance->Give the capacitor->Charge to->At the same time give load->And supplying power to realize positive two-level output.
In a second mode of operation, as shown in FIG. 3f, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、/>、、/>、/>And diode->、/>、/>And (5) disconnecting. Inductance->、/>And (5) charging. Capacitance->、/>And->And (5) discharging. DC power supply series capacitor->Inductance->Charging, capacitance->Give->Charging, capacitance->Give load->And supplying power to realize positive two-level output.
When the output voltage is negative one level, the common-ground type switch capacitor five-level inverter has four working modes.
In a first mode of operation, as shown in FIG. 3g, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting. Power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. Capacitance->、/>、/>And->And (5) charging. Capacitance->Inductance->、/>And (5) discharging. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give the capacitor->Charge to->DC power supply series inductance +.>Give the capacitor->Charge to->Capacitance->Series reverse capacitance->Give load->And supplying power to realize negative one-level output.
In a second mode of operation, as shown in FIG. 3h, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、/>、、/>、/>And diode->、/>、/>And (5) disconnecting. Capacitance->And (5) charging. Inductance->、/>And (5) charging. Capacitance->、/>And->And (5) discharging. DC power supply series capacitor->Inductance->Charging, capacitance->Inductance->Charging, capacitance->Series reverse capacitance->Give load->And supplying power to realize negative one-level output.
In a third mode of operation, as shown in FIG. 3i, the power switch tube、/>、/>、/>、/>And diode->Conducting. Power switch tube->、/>、/>、/>、/>And diode->、/>And (5) disconnecting. Capacitance->、/>And->And (5) charging. Capacitance->、/>And (5) discharging. Inductance->、And (5) discharging. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give the capacitor->Charged toDC power supply series inductance +.>And capacitance->Give the capacitor->Charge to->Capacitance->Give load->And supplying power to realize negative one-level output.
In a fourth mode of operation, as shown in FIG. 3j, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、/>、、/>、/>And diode->、/>、/>And (5) disconnecting. Inductance->、/>And (5) charging. Capacitance->、/>And->And (5) discharging. DC power supplySeries capacitor->Inductance->Charging, capacitance->Inductance->Charging, capacitance->Give load->And supplying power to realize negative one-level output.
During the negative one-level output period, four switching modes are switched at high frequency, and the redundant switching state can enable the capacitor C2 to be charged in a negative half period, so that the voltage ripple of the capacitor is reduced, and the capacitance value of the capacitor is greatly reduced.
When the output voltage is in a negative two-level state, the common-ground type switch capacitor five-level inverter has two working modes.
In a first mode of operation, as shown in FIG. 3k, the power switch tube、/>、/>、/>And diode->、/>、/>Conducting. Power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. Capacitance->、/>、/>And->And (5) charging. Capacitance->Inductance->、/>And (5) discharging. DC power supply series inductance +.>Give the capacitor->Charge to->Inductance->Give the capacitor->Charge to->DC power supply series inductance +.>Give the capacitor->Charge to->Capacitance->Give load->And supplying power to realize negative two-level output.
In a second mode of operation, as shown in FIG. 3l, the power switch tube、/>、/>And->Conducting. Power switch tube->、/>、/>、、/>、/>And diode->、/>、/>And (5) disconnecting. Inductance->、/>And (5) charging. Capacitance->、/>And->And (5) discharging. DC power supply series capacitor->Inductance->Charging, capacitance->Inductance->Charging, capacitance->Give load->And supplying power to realize negative two-level output.
The following results were obtained using PSIM simulation. The input current fluctuates between 4A and 7A, and no large instantaneous current exists, so that the topology is verified that the instantaneous current can be reduced, and the input current is continuous. The square root value of the output voltage is 220V, the output frequency is 50Hz, the theoretical analysis is met, the structure has certain boosting capability, and the feasibility of the structure is verified.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. A common-ground type switch capacitor five-level inverter is characterized in that: comprises an inverter unit and an auxiliary branch;
the inverter unit includes: DC power supply and power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Diode->Diode->Inductance->Inductance->Capacitance->Capacitance->Capacitance->Capacitance/>；
The positive end of the direct current power supply and the inductorIs connected to the first end of the housing; negative terminal of the DC power supply and the capacitorIs the second terminal of the power switch tube +.>Is the second terminal of the power switch tube +.>The second end of the power switch tubeIs the first end, output port->Is connected to and constitutes a 2-port of the inverter unit; the negative end of the direct current power supply is grounded; said inductance->Is connected to the second terminal of (c) and the capacitor +.>Is said diode +.>Is connected to the first end of the housing; said capacitor->Is +.>Is said inductance +.>Is connected to the first end of the housing; said inductance->Is connected to the second terminal of the power switch tube>Is said capacitor +.>Is +.>Is connected to and constitutes a 3-port of the inverter unit; said diode->Is connected to the second terminal of (c) and the capacitor +.>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; the power switch tube->Is connected to the second terminal of (c) and the capacitor +.>Is the second terminal of the power switch tube +.>Is connected to the first end of the housing; the power switch tube->And the power switch tubeIs said capacitor +.>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; said capacitor->Is connected to the second terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member; the power switch tube->Is connected to the second terminal of the power switch tube>Second terminal, output port->Is connected to and constitutes a 1 port of the inverter unit;
the auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Diode->Capacitance->；
The power switch tubeIs connected to the 1 port of the inverter unit; the power switch tube->Is +.>Is said capacitor +.>Is connected to the second end of the first member; said diode->Is connected to the second terminal of the power switch tube>Is connected with the second end of the inverter unit and the 2 port of the inverter unit; the power switch tube->Is +.>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member;
the power switch tubeIs connected to the 3-port of the inverter unit.
2. A common-mode switched capacitor five-level inverter as claimed in claim 1, wherein,
the power switch tubeThe power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>Is a fully controlled device;
the power switch tubeThe power switch tube>The power switch tube>The power switch tube>Is a bidirectional voltage-resistant fully-controlled device.
3. A common-mode switched capacitor five-level inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor five-level inverter is controlled by adopting a sine pulse width modulation mode.
4. A common-mode switched capacitor five-level inverter as claimed in claim 1, wherein,
each voltage level of the common-ground type switch capacitor five-level inverter has at least two working modes; switching between different modes of operation occurs during each voltage level output.
5. A common-mode switched capacitor five-level inverter as claimed in claim 1, wherein,
the output voltage of the common-ground type switch capacitor five-level inverter has five voltage levels, namely zero level, positive one level, positive two level, negative one level and negative two level.
6. A common-mode switched capacitor five-level inverter as claimed in claim 5, wherein,
when the output voltage is zero level, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switching tube、/>、/>、/>、/>And the diode->、/>Conducting; the power switch tube->、/>、/>、/>、/>And the diode->Disconnecting; said capacitor->、/>、/>And->Charging; said capacitor->Discharging; said inductance->、/>Discharging;
in a second mode of operation, the power switching tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>And the diode->、/>、/>Disconnecting; said inductance->、/>Charging; said capacitor->And->And (5) discharging.
7. A common-mode switched capacitor five-level inverter as claimed in claim 5, wherein,
when the output voltage is positive one level, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switching tube、/>、/>、/>And the diode->、/>、/>Conducting; the power switch tube->、/>、/>、/>、/>And->Disconnecting; said capacitor->、/>、/>And->Charging; said inductance->、/>Discharging;
in a second mode of operation, the power switch tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、、/>And the diode->、/>、/>Disconnecting; said inductance->、/>Charging; said capacitor->、/>And->And (5) discharging.
8. A common-mode switched capacitor five-level inverter as claimed in claim 5, wherein,
when the output voltage is in a positive two-level state, the common-ground type switch capacitor five-level inverter has two working modes;
in a first mode of operation, the power switching tube、/>、/>、/>、/>And the diode->、/>Conducting; the power switch tube->、/>、/>、/>、/>And the diode->Disconnecting; said capacitor->、/>And->Charging; said capacitor->Said inductance->、/>Discharging;
in a second mode of operation, the power switch tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、、/>And the diode->、/>、/>Disconnecting; said inductance->、/>Charging; said capacitor->、/>And->And (5) discharging.
9. A common-mode switched capacitor five-level inverter as claimed in claim 5, wherein,
when the output voltage is in a negative level, the common-ground type switch capacitor five-level inverter has four working modes;
in a first mode of operation, the power switching tube、/>、/>、/>And the diode->、/>、/>Conducting; the power switch tube->、/>、/>、/>、/>And->Disconnecting; said capacitor->、/>、/>And->Charging; said capacitor->Said inductor、/>Discharging;
in a second mode of operation, the power switch tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、、/>And the diode->、/>、/>Disconnecting; said capacitor->Charging; said inductance->、/>Charging; said capacitor->、And->Discharging;
in a third mode of operation, the power switch tube、/>、/>、/>、/>And the diode->Conducting; the power switch tube->、/>、/>、/>、/>And the diode->、/>Disconnecting; said capacitor->、/>And->Charging; said capacitor->、Discharging; said inductance->、/>Discharging;
in a fourth mode of operation, the power switch tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、、/>And the diode->、/>、/>Disconnecting; said inductance->、/>Charging; said capacitor->、/>And->And (5) discharging.
10. A common-mode switched capacitor five-level inverter as claimed in claim 5, wherein,
when the output voltage is in a negative two-level state, the common-ground type switch capacitor five-level inverter has two working modes;
at the first workerMode as, the power switch tube、/>、/>、/>And the diode->、/>、/>Conducting; the power switch tube->、/>、/>、/>、/>And->Disconnecting; said capacitor->、/>、/>And->Charging; said capacitor->Said inductor、/>Discharging;
in a second mode of operation, the power switch tube、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、、/>And the diode->、/>、/>Disconnecting; said inductance->、/>Charging; said capacitor->、/>And->And (5) discharging.
CN202311815205.0A 2023-12-27 2023-12-27 Common-ground type switch capacitor five-level inverter Active CN117477974B (en)

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Citations (2)

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CN103199727A (en) * 2013-04-17 2013-07-10 东南大学 Zero current switching full-bridge type non-isolated photovoltaic grid-connected inverter
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Publication number Priority date Publication date Assignee Title
CN103199727A (en) * 2013-04-17 2013-07-10 东南大学 Zero current switching full-bridge type non-isolated photovoltaic grid-connected inverter
CN117200602A (en) * 2023-09-22 2023-12-08 安徽工业大学 Dual-mode leakage-current-free non-isolated five-level single-stage boosting grid-connected inverter

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