CN113783449A - Common-ground type double-output switch capacitance type multi-level inverter - Google Patents

Common-ground type double-output switch capacitance type multi-level inverter Download PDF

Info

Publication number
CN113783449A
CN113783449A CN202111032523.0A CN202111032523A CN113783449A CN 113783449 A CN113783449 A CN 113783449A CN 202111032523 A CN202111032523 A CN 202111032523A CN 113783449 A CN113783449 A CN 113783449A
Authority
CN
China
Prior art keywords
output
capacitor module
switched capacitor
common
bridge arm
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.)
Pending
Application number
CN202111032523.0A
Other languages
Chinese (zh)
Inventor
姚佳
许志远
林通
郑晓枫
张俊芳
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.)
Nanjing University of Science and Technology
Original Assignee
Nanjing University of Science and Technology
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 Nanjing University of Science and Technology filed Critical Nanjing University of Science and Technology
Priority to CN202111032523.0A priority Critical patent/CN113783449A/en
Publication of CN113783449A publication Critical patent/CN113783449A/en
Pending legal-status Critical Current

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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • 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
    • H02M7/53871—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 with automatic control of output voltage or current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a common-ground dual-output switch capacitor type multi-level inverter which comprises a power input end, a switch capacitor module A, a switch capacitor module B, H bridge unit and two alternating current output ends Vo1、Vo2Wherein the H-bridge structure comprises a switch tube S1、S2、S3、S4The bridge arm switching tubes are respectively an upper bridge arm switching tube of a first bridge arm, a lower bridge arm switching tube of the first bridge arm, an upper bridge arm switching tube of a second bridge arm and a lower bridge arm switching tube of the second bridge arm; the negative electrode of the output end of the switched capacitor module A, B is connected with a common ground point and is connected with the common ground point of the alternating current output loads z1 and z2 to form a common ground end; the positive electrode of the output end of the switched capacitor module A is connected with the switchPipe S1、S3A cathode of (a); the positive electrode of the output end of the switched capacitor module B is connected with the switching tube S2、S4Of (2) an anode. The invention has the advantages of common input and output voltage, continuous input current and high gain, the system has two output ports, the number of devices adopted by each output port is smaller than that of similar topology, and the total harmonic distortion of output waveforms is lower.

Description

Common-ground type double-output switch capacitance type multi-level inverter
Technical Field
The invention belongs to the field of multi-level inverters and new energy distributed grid-connected power generation, and particularly relates to a common-ground double-output switch capacitor type multi-level inverter and a modulation method thereof.
Background
The current photovoltaic inverter has the following problems: 1. leakage current exists when connected to the grid; 2. there is no boosting effect. The existence of leakage current causes a potential safety hazard, and the reason for this is that the input and output are not grounded in common, and for this problem, a common-ground type inverter has been proposed. The absence of a boost characteristic results in a large output voltage THD and therefore requires a large filter resulting in low efficiency. The boost effect of the switch capacitor type inverter is good, the adjustment is easy, and the switch capacitor type inverter is commonly used in a multi-level topological structure. Therefore, the invention provides a common-ground dual-output switch capacitor type multi-level inverter and a modulation method thereof.
Disclosure of Invention
The invention aims to provide a common-ground dual-output switched capacitor type multi-level inverter and a modulation method thereof.
The technical scheme for realizing the purpose of the invention is as follows: a common-ground dual-output switch capacitor type multi-level inverter comprises a power input end, a switch capacitor module A, a switch capacitor module B, H bridge unit and two alternating current output ends Vo1、Vo2The H-bridge structure comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4The upper bridge arm switching tube of the first bridge arm is S1The lower bridge arm switching tube of the first bridge arm is S2The upper bridge arm switching tube of the second bridge arm is S3The lower bridge arm switching tube of the second bridge arm is S4(ii) a The midpoint of the first bridge arm is an alternating current output end Vo1The midpoint of the second bridge arm is an alternating current output end Vo2Wherein:
the power input end is connected with the anode of an input power Vin, and the cathode of the input power Vin is connected with a common place;
the input ends of the switched capacitor module A and the switched capacitor module B are connected with the power supply input end, the negative ends of the output ends of the switched capacitor module A and the switched capacitor module B are connected with a common ground point, and are connected with the common ground point of an alternating current output load z1 and a load z2 to form a common ground end; the positive electrode of the output end of the switched capacitor module A is connected with the switching tube S1Cathode and switching tube S3A cathode of (a); the positive electrode of the output end of the switched capacitor module B is connected to the switching tube S2Anode and switching tube S4The anode of (1);
the switch tube S1Is connected to the switching tube S3The cathode of the switch capacitor module A, the output positive end of the switch capacitor module A and the switch tube S1Is connected to the switching tube S2The non-common terminal of the ac output load z 1; the switch tube S2Is connected to the switching tube S4The anode of the switch capacitor module B and the output positive end of the switch capacitor module B; the switch tube S3Is connected to the switching tube S4The non-common terminal of the ac output load z 2;
the two alternating current output ends Vo1、Vo2The other ends of the load z1 and the load z2, the alternating current load z1 and the alternating current load z2 are connected to the common ground respectively.
Further, the switch tube S1Switch tube S2Switch tube S3And a switching tube S4A MOSFET or an IGBT is used.
Further, the switched capacitor module a and the switched capacitor module B use the same type of switched capacitor topology or different types of switched capacitor topologies.
Further, the switched capacitor module a and the switched capacitor module B adopt a series-parallel type, a cascade type, a step type or a fibonacci type switched capacitor topology.
Further, the switching devices used by the switched capacitor module a and the switched capacitor module B are MOSFETs or IGBTs.
Further, the operation mode of the inverter H-bridge unit is as follows:
working mode 1: controlling a switching device S1、S4Conducting and controlling the switch tube S2、S3Turning off;
and (3) working mode 2: controlling a switching device S1、S3Conducting and controlling the switch tube S2、S4Turning off;
working mode 3: controlling a switching device S2、S3Conducting and controlling the switch tube S1、S4Turning off;
the working mode 4 is as follows: controlling a switching device S2、S4Conducting and controlling the switch tube S1、S3And (6) turning off.
Further, the switched capacitor module a and the switched capacitor module B respectively generate a stepped sine half-wave of direct current, and the alternating current output end Vo1、Vo2The positive half-wave of (A) is generated by a switched capacitor module B, and an alternating current output end Vo1、Vo2Is generated by the switched capacitor module a.
Further, the output voltage V of the switched capacitor module AAAnd the output voltage V of the switched capacitor module BBThe same, the output voltage frequency f of the switched capacitor module AAAnd the output voltage frequency f of the switched capacitor module BBThe same; the AC output end Vo1、Vo2Are the same and are 180 degrees out of phase.
A control method of a common-ground dual-output switch capacitor type multi-level inverter is based on the common-ground dual-output switch capacitor type multi-level inverter, and multi-level inverter control is achieved.
Further, the multi-level inverter control is realized by using LS-SPWM, SHE or NLC.
Compared with the prior art, the invention has the remarkable advantages that: 1) the input and the load are grounded, so that the system leakage current can be inhibited; 2) a permanent non-zero input current; 3) compared with the common ground SC inverter of the same type, the common ground SC inverter has higher boosting multiple under the condition of the same number of devices; 4) two independently controllable output ac voltage sources (same amplitude, opposite phase) are provided, and the two loads need not be symmetrical and do not affect each other.
Drawings
Fig. 1 is a circuit diagram of an inverter in an embodiment of the invention;
FIG. 2 is a circuit diagram of an inverter using a series-parallel topology in an embodiment of the present invention;
fig. 3 is a schematic diagram of an operating current path of an inverter operating mode 1 according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an operating current path of an inverter operating mode 2 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an operating current path of the inverter operating mode 3 according to the embodiment of the present invention;
fig. 6 is a schematic diagram of an operating current path of the inverter operating mode 4 according to the embodiment of the present invention;
fig. 7 is a schematic diagram of an operating current path of the inverter operating mode 5 in the embodiment of the invention;
fig. 8 is a schematic diagram of an operating current path of the inverter operating mode 6 according to the embodiment of the present invention;
fig. 9 is a schematic diagram of an operating current path of the inverter operating mode 7 according to the embodiment of the present invention;
fig. 10 is a schematic diagram of an operating current path of the inverter operating mode 8 according to the embodiment of the present invention;
fig. 11 is a schematic diagram of an operating current path of the inverter operating mode 9 according to the embodiment of the present invention;
FIG. 12 is a waveform diagram between input and output ground in an embodiment of the present invention;
fig. 13 is a graph of the output voltage waveform of the inverter in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in FIG. 1, a common-ground dual-output switched capacitor type multi-level inverterThe device comprises a power input end, a switched capacitor module A, a switched capacitor module B, H bridge unit and two AC output ends Vo1、Vo2。
The H-bridge unit comprises a switch tube S1、S2、S3、S4The switching device can be, but is not limited to, a controllable switching device such as a MOSFET, an IGBT, etc., and is defined as follows: one side of the current flowing into the device is an anode and one side of the current flowing out of the device is a cathode.
The upper bridge arm switching tube of the first bridge arm is S1The lower bridge arm switching tube of the first bridge arm is S2The upper bridge arm switching tube of the second bridge arm is S3The lower bridge arm switching tube of the second bridge arm is S4. The midpoint of the first bridge arm is an alternating current output Vo1The midpoint of the second bridge arm is an alternating current output Vo2Is not common to ground. The switch tube S1Is connected to the switching tube S3The cathode of the switch capacitor module A, the output positive end of the switch capacitor module A and the switch tube S1Is connected to the switching tube S2The non-common ground of the ac output load z1, the switching tube S2Is connected to the switching tube S4The anode of the switch capacitor module B, and the output positive end of the switch capacitor module B, and the switch tube S3Is connected to the switching tube S4And the non-common terminal of the ac output load z 2.
The switched capacitor module a and the switched capacitor module B may use the same type of switched capacitor topology, or may use different types of switched capacitor topologies, and the structure may be, but is not limited to, a series-parallel type, a cascade type, a Ladder type (Ladder), a fibonacci type, or other switched capacitor topologies. The switching devices used in the switched capacitor module a and the switched capacitor module B may be, but are not limited to, MOSFETs or IGBTs.
The input end of the switched capacitor module A is connected with the power input end, and the power input end is connected with an input power supply VinThe positive pole of the output end of the switch capacitor module A is connected with the switch tube S1Cathode and switching tube S3The cathode of the switched capacitor module a is connected to the common ground of the load z1 and the load z 2. Switched capacitor moduleThe input end of B is connected with the input end of a power supply, and the positive electrode of the output end of the switched capacitor module B is connected with the switching tube S2Anode and switching tube S4The cathode of the output terminal of the switched capacitor module B is connected to the common ground of the load z1 and the load z 2.
The two alternating current output ends Vo1、Vo2The other ends of the load z1 and the load z2, the AC load z1 and the AC load z2 are connected to the same ground respectively, and the input power supply V is connectedinThe negative electrode of (1).
The working principle and the modulation process of the common-ground dual-output switched capacitor type multi-level inverter are explained through the analysis of the H-bridge unit and the switched capacitor module.
In the common-ground dual-output switched capacitor type multi-level inverter, the H-bridge unit has four working modes:
working mode 1: controlling a switching device S1、S4Conducting and controlling the switch tube S2、S3Turning off;
and (3) working mode 2: controlling a switching device S1、S3Conducting and controlling the switch tube S2、S4Turning off;
working mode 3: controlling a switching device S2、S3Conducting and controlling the switch tube S1、S4Turning off;
the working mode 4 is as follows: controlling a switching device S2、S4Conducting and controlling the switch tube S1、S3And (6) turning off.
Through the four working modes, two groups of alternating current output can be realized.
In the common-ground double-output switched capacitor type multi-level inverter, the switched capacitor module A and the switched capacitor module B respectively generate a step-shaped sine half-wave of direct current, wherein a waveform generated by the switched capacitor module A is used as an alternating current output end Vo1、Vo2The negative half wave of (2), the waveform generated by the switched capacitor module B as the AC output end Vo1、Vo2The positive half wave of (a). Output voltage V of switched capacitor module AAAnd the output voltage V of the switched capacitor module BBThe same, the output voltage frequency f of the switched capacitor module AAAnd the output voltage frequency f of the switched capacitor module BBThe same is true. Output voltage Vo1And Vo2Have the same effective value and have a phase difference of 180 degrees, and the frequency f of the output voltageOIs half of the output voltage frequency of the switched capacitor module A and the switched capacitor module B.
The modulation scheme used may be, but is not limited to: LS-SPWM, SHE, NLC and other multi-level inverter control modes.
In conclusion, the invention has the characteristics of multi-level output, high gain, common ground structure and multi-path output, eliminates the leakage current of output and input, and realizes lower voltage harmonic wave and better electric energy quality on the alternating current side. The invention can be used in DC-AC converters of electric vehicles, photovoltaic grid-connected power generation and distributed power generation systems for researching fire and heat in recent years.
Examples
To verify the validity of the inventive scheme, the following simulation experiment was performed.
In this embodiment, the input voltage is 40V, the two groups of loads are both 60 Ω, the output frequency is 60HZ, and the output power is 400W. Capacitor CL1＝CL2＝CL3＝CL44700 μ F, capacitance CR1＝CR2＝CR34700 μ F. The switching devices used are MOSFETs.
As shown in fig. 2, the switched capacitor module a and the switched capacitor module B are connected in series-parallel, and the positive electrode of the dc input power Vin is connected to SL12、SL22、SL32、SL42And SR13、SR23、SR33A source electrode of (a); DC input voltage source VinIs connected to SL13、SL23、SL33、SL43Drain electrode of (1), SR12、SR22、SR32Source and S ofL11A source electrode of (a); capacitor CL1、CL2、CL3、CL4Is connected to SL12、SL22、SL32、SL42Source and S ofL11、SL21、SL31、SL41A drain electrode of (1); capacitor CL1、CL2、CL3、CL4Is connected to SL11、SL21、SL31、SL41Source and S ofL13、SL23、SL33、SL43A source electrode of (a); capacitor CR1、CR2、CR3Is connected to SR11、SR21、SR31And SR13、SR23、SR33A drain electrode of (1); capacitor CR1、CR2、CR3Is connected to SR11、SR21、SR31Source and S ofL12、SL22、SL32、SL42Of the substrate.
The H-bridge unit comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4Said switch tube S1Is connected to the switching tube S3Source electrode of the switch capacitor module A, output positive terminal of the switch capacitor module A, and switch tube S1Is connected to the switching tube S2The source of the ac output load z1, the switching tube S2Is connected to the switching tube S4The drain electrode of the switching capacitor module B, the output positive end of the switching capacitor module B, and the switching tube S3Is connected to the switching tube S4The non-common terminal of the ac output load z 2;
the output end of the inverter comprises two alternating current output ends which are respectively connected with a load z1 and a load z2, the alternating current load z1 and the alternating current load z2 are connected with the common ground, the common ground end of the load z1 and the load z2 is connected with the negative ends of the switched capacitor module A and the switched capacitor module B, and the non-common ground end of the load z1 is connected with the switching tube S1Drain electrode of (1), and switching tube S2The non-common ground terminal of the load z2 is connected to the switch tube S3Drain electrode of (1), and switching tube S4Of the substrate.
Based on the series-parallel structure, the inverter can make two paths of loads obtain the following levels by the series-parallel conversion of the power supply and the capacitor under the condition of using a small number of devices:
Vo1:0、±Vin、±2Vin、±3Vin、±4Vin；
Vo2:0、±Vin、±2Vin、±3Vin、±4Vin；
fig. 3 to 11 are working current paths of nine working modes of the inverter, respectively, in which a charging circuit in the diagram is analyzed in the working modes, two different dotted lines respectively represent discharging circuits of the switched capacitor module a and the switched capacitor module B, a virtual device represents that the device does not work, and the working modes of the inverter are as follows:
working mode 1: controlling a switching device SL11、SL21、SL31、SL41、SR11、SR21、SR31、S1、S4And conducting to control the other switching devices to be switched off. Capacitor CL1、CL2、CL3、CL4Discharging in series to load z1, source VinAnd a capacitor CR1、CR2、CR3Series discharge to load z2, the output of the inverter is: vo1＝-4Vin，Vo2＝4VinThe operating current path is shown in fig. 3.
And (3) working mode 2: controlling a switching device SL12、SL13、SL21、SL31、SL41、SR12、SR13、SR21、SR31、S1、S4And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CR1Charging, capacitance CL2、CL3、CL4Discharging in series to load z1, source VinAnd a capacitor CR2、CR3Series discharge to load z2, the output of the inverter is: vo1＝-3Vin，Vo2＝3VinThe operating current path is shown in fig. 4.
Working mode 3: controlling a switching device SL12、SL13、SL22、SL23、SL31、SL41、SR12、SR13、SR22、SR23、SR31、S1、S4Conducting and controlling other switchesThe element is turned off. Power supply VinIs a capacitor CL1、CL2、CR1、CR2Charging, capacitance CL3、CL4Discharging in series to load z1, source VinAnd a capacitor CR3Series discharge to load z2, the output of the inverter is: vo1＝-2Vin，Vo2＝2VinThe operating current path is shown in fig. 5.
The working mode 4 is as follows: controlling a switching device SL12、SL13、SL22、SL23、SL32、SL33、SL41、SR12、SR13、SR22、SR23、SR32、SR33、S1、S4And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CL2、CL3、CR1、CR2、CR3Charging, capacitance CL4Discharging to load z1, power supply VinDischarge to load z2, the output of the inverter is: vo1＝-Vin，Vo2＝VinThe operating current path is shown in fig. 6.
Working mode 5: controlling a switching device SL12、SL13、SL22、SL23、SL32、SL33、SL42、SL43、SR12、SR13、SR22、SR23、SR32、SR33、S1、S3And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CL2、CL3、CL4、CR1、CR2、CR3The power is charged, and the output of the inverter is as follows: vo1＝0，Vo2The operating current path is shown in fig. 7 at 0.
The working mode 6 is as follows: controlling a switching device SL12、SL13、SL22、SL23、SL32、SL33、SL41、SR12、SR13、SR22、SR23、SR32、SR33、S2、S3And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CL2、CL3、CR1、CR2、CR3Charging, capacitance CL4Discharging to load z2, power supply VinDischarge to load z1, the output of the inverter is: vo1＝Vin，Vo2＝-VinThe operating current path is shown in fig. 8.
The working mode 7 is as follows: controlling a switching device SL12、SL13、SL22、SL23、SL31、SL41、SR12、SR13、SR22、SR23、SR31、S2、S3And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CL2、CR1、CR2Charging, capacitance CL3、CL4Discharging in series to load z2, source VinAnd a capacitor CR3Series discharge to load z1, the output of the inverter is: vo1＝2Vin，Vo2＝-2VinThe operating current path is shown in fig. 9.
The working mode 8 is as follows: controlling a switching device SL12、SL13、SL21、SL31、SL41、SR12、SR13、SR21、SR31、S2、S3And conducting to control the other switching devices to be switched off. Power supply VinIs a capacitor CL1、CR1Charging, capacitance CL2、CL3、CL4Discharging in series to load z2, source VinAnd a capacitor CR2、CR3Series discharge to load z1, the output of the inverter is: vo1＝3Vin，Vo2＝-3VinThe operating current path is shown in fig. 10.
The working mode 9 is as follows: controlling a switching device SL11、SL21、SL31、SL41、SR11、SR21、SR31、S2、S3Conducting to control the other switch devices to be turned off. Capacitor CL1、CL2、CL3、CL4Discharging in series to load z2, source VinAnd a capacitor CR1、CR2、CR3Series discharge to load z1, the output of the inverter is: vo1＝4Vin，Vo2＝-4VinThe operating current path is shown in fig. 11.
The following results were obtained using PSIM simulation. Fig. 12 is a waveform between an input voltage ground and an output voltage ground, the voltages shown as zero, verifying the common ground nature of the topology. Fig. 13 shows an output voltage waveform, two output phases are 180 degrees apart, and the root mean square values are the same, which accords with theoretical analysis.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The common-ground dual-output switched capacitor type multi-level inverter is characterized by comprising a power input end, a switched capacitor module A, a switched capacitor module B, H bridge unit and two alternating current output ends Vo1、Vo2The H-bridge structure comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4The upper bridge arm switching tube of the first bridge arm is S1The lower bridge arm switching tube of the first bridge arm is S2The upper bridge arm switching tube of the second bridge arm is S3The lower bridge arm switching tube of the second bridge arm is S4(ii) a The midpoint of the first bridge arm is an alternating current output end Vo1The midpoint of the second bridge arm is an alternating current output end Vo2Wherein:
the power input end is connected with the anode of an input power Vin, and the cathode of the input power Vin is connected with a common place;
the input ends of the switched capacitor module A and the switched capacitor module B are connected with the power supply input end, the negative ends of the output ends of the switched capacitor module A and the switched capacitor module B are connected with a common ground point, and are connected with the common ground point of an alternating current output load z1 and a load z2 to form a common ground end; the positive electrode of the output end of the switched capacitor module A is connected with the switching tube S1Cathode and switching tube S3A cathode of (a); the positive electrode of the output end of the switched capacitor module B is connected to the switching tube S2Anode and switching tube S4The anode of (1);
the switch tube S1Is connected to the switching tube S3The cathode of the switch capacitor module A, the output positive end of the switch capacitor module A and the switch tube S1Is connected to the switching tube S2The non-common terminal of the ac output load z 1; the switch tube S2Is connected to the switching tube S4The anode of the switch capacitor module B and the output positive end of the switch capacitor module B; the switch tube S3Is connected to the switching tube S4The non-common terminal of the ac output load z 2;
the two alternating current output ends Vo1、Vo2The other ends of the load z1 and the load z2, the alternating current load z1 and the alternating current load z2 are connected to the common ground respectively.
2. A common-ground dual-output switched capacitor type multilevel inverter according to claim 1, wherein the switching tube S1Switch tube S2Switch tube S3And a switching tube S4A MOSFET or an IGBT is used.
3. The common ground dual output switched capacitor multi-level inverter of claim 1, wherein the switched capacitor module a and the switched capacitor module B use the same type of switched capacitor topology or different types of switched capacitor topologies.
4. The common-ground dual-output switched-capacitor multi-level inverter of claim 1, wherein the switched-capacitor module A and the switched-capacitor module B employ a series-parallel, cascaded, stepped, or Fibonacci switched-capacitor topology.
5. The common ground dual-output switched capacitor multi-level inverter of claim 1, wherein the switching devices of the switched capacitor modules A and B are MOSFETs or IGBTs.
6. The common-ground dual-output switched capacitor type multilevel inverter according to claim 1, wherein the inverter H-bridge unit has the following operation modes:
working mode 1: controlling a switching device S1、S4Conducting and controlling the switch tube S2、S3Turning off;
and (3) working mode 2: controlling a switching device S1、S3Conducting and controlling the switch tube S2、S4Turning off;
working mode 3: controlling a switching device S2、S3Conducting and controlling the switch tube S1、S4Turning off;
the working mode 4 is as follows: controlling a switching device S2、S4Conducting and controlling the switch tube S1、S3And (6) turning off.
7. The common-ground dual-output switched capacitor multi-level inverter according to claim 1, wherein the switched capacitor module A and the switched capacitor module B respectively generate stepped sine half waves of direct current, and the alternating current output terminals Vo1、Vo2The positive half-wave of (A) is generated by a switched capacitor module B, and an alternating current output end Vo1、Vo2Is generated by the switched capacitor module a.
8. The common-ground dual-output switched-capacitor multi-level inverter of claim 7, wherein the output voltage V of the switched-capacitor module AAAnd the output voltage V of the switched capacitor module BBThe same, the output voltage frequency f of the switched capacitor module AAAnd the output voltage frequency f of the switched capacitor module BBThe same; the AC output end Vo1、Vo2Are the same and are 180 degrees out of phase.
9. A control method of a common-ground dual-output switching capacitance type multi-level inverter, characterized in that the multi-level inverter control is realized based on the common-ground dual-output switching capacitance type multi-level inverter of any one of claims 1 to 8.
10. A method for controlling a common-ground dual-output switched capacitor multi-level inverter as claimed in claim 9, wherein the multi-level inverter control can be implemented but not limited to using LS-SPWM, SHE, NLC.
CN202111032523.0A 2021-09-03 2021-09-03 Common-ground type double-output switch capacitance type multi-level inverter Pending CN113783449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111032523.0A CN113783449A (en) 2021-09-03 2021-09-03 Common-ground type double-output switch capacitance type multi-level inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111032523.0A CN113783449A (en) 2021-09-03 2021-09-03 Common-ground type double-output switch capacitance type multi-level inverter

Publications (1)

Publication Number Publication Date
CN113783449A true CN113783449A (en) 2021-12-10

Family

ID=78841188

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111032523.0A Pending CN113783449A (en) 2021-09-03 2021-09-03 Common-ground type double-output switch capacitance type multi-level inverter

Country Status (1)

Country Link
CN (1) CN113783449A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115765510A (en) * 2022-12-15 2023-03-07 南京理工大学 Control method of dual-port multi-level inverter
CN117477975A (en) * 2023-12-27 2024-01-30 南京理工大学 Common-ground type switch capacitor multi-level inverter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106100405A (en) * 2016-06-30 2016-11-09 华东交通大学 A kind of level quinque switch H bridge multi-electrical level inverter
CN109818518A (en) * 2017-06-09 2019-05-28 南京理工大学 A kind of modular series connection inverter
CN110071654A (en) * 2019-05-14 2019-07-30 郑州大学 A kind of multiport switch capacitor multi-electrical level inverter and its modulator approach
CN110149065A (en) * 2019-05-13 2019-08-20 郑州大学 A kind of buck switching capacity multi-electrical level inverter and its modulator approach
CN110365232A (en) * 2019-08-14 2019-10-22 西北工业大学 A kind of the single-input double-output converter and its control method of wide output voltage range
CN110460259A (en) * 2019-07-25 2019-11-15 南京邮电大学 Ten switch of one kind staggeredly clamps three-phase photovoltaic inverter topological structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106100405A (en) * 2016-06-30 2016-11-09 华东交通大学 A kind of level quinque switch H bridge multi-electrical level inverter
CN109818518A (en) * 2017-06-09 2019-05-28 南京理工大学 A kind of modular series connection inverter
CN110149065A (en) * 2019-05-13 2019-08-20 郑州大学 A kind of buck switching capacity multi-electrical level inverter and its modulator approach
CN110071654A (en) * 2019-05-14 2019-07-30 郑州大学 A kind of multiport switch capacitor multi-electrical level inverter and its modulator approach
CN110460259A (en) * 2019-07-25 2019-11-15 南京邮电大学 Ten switch of one kind staggeredly clamps three-phase photovoltaic inverter topological structure
CN110365232A (en) * 2019-08-14 2019-10-22 西北工业大学 A kind of the single-input double-output converter and its control method of wide output voltage range

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘苗;洪峰;王成华;: "五电平飞跨电容型双降压逆变器", 电工技术学报, no. 05, 26 May 2011 (2011-05-26) *
路莲;边敦新;黄钰;甘德强;: "新型单相不对称五电平无变压器型光伏逆变器", 电子技术应用, no. 12, 6 December 2018 (2018-12-06) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115765510A (en) * 2022-12-15 2023-03-07 南京理工大学 Control method of dual-port multi-level inverter
CN117477975A (en) * 2023-12-27 2024-01-30 南京理工大学 Common-ground type switch capacitor multi-level inverter

Similar Documents

Publication Publication Date Title
Jain et al. A highly efficient and reliable inverter configuration based cascaded multilevel inverter for PV systems
Samizadeh et al. A new topology of switched-capacitor multilevel inverter with eliminating leakage current
CN109391166B (en) Conversion circuit, control method and power supply equipment
US9407165B2 (en) Cascade bridge-type DC-AC power conversion method and converter device thereof
Aalami et al. Design of a new combined cascaded multilevel inverter based on developed H-bridge with reduced number of IGBTs and DC voltage sources
CN113783449A (en) Common-ground type double-output switch capacitance type multi-level inverter
CN115149831A (en) Common-ground type switched capacitor multi-level inverter
Janardhan et al. A symmetrical multilevel inverter topology with minimal switch count and total harmonic distortion
Zhang et al. A hybrid modulation method for single-phase quasi-Z source inverter
CN116317648A (en) Expandable common-ground type switch capacitor multi-level inverter
Patil et al. Designing Of Z-source inverter for photovoltaic system using MATLAB/SIMULINK
Turksoy et al. A novel adaptive switching method to reduce DC-Link capacitor ripple in PV based grid-connected inverter
Samizadeh et al. A new topology of switched-capacitor multilevel inverter for single-phase grid-connected with eliminating leakage current
Ghodsi et al. A new switched-inductor quasi-Z-source inverter
Vivek et al. Investigation on photovoltaic system based asymmetrical multilevel inverter for harmonic mitigation
CN111446874A (en) Single-phase boost common-mode inverter and modulation method thereof
Lee et al. Single-stage common-ground boost inverter (S 2 CGBI) for solar photovoltaic systems
Singhai et al. New topology of asymmtrical multilevel inverter [15/29 Level]
Hota et al. A novel single-phase switched-capacitor based 5-level inverter topology featuring voltage boosting capability and common mode voltage reduction
CN116647119A (en) Common-ground type switched capacitor inverter with continuous input current and control method thereof
CN112865561B (en) Diode clamping type back-to-back bridgeless three-level rectifier
Vital et al. An Improved Pulse Width Modulation Technique for the Attenuation of Leakage Current in Five-Level Transformerless PV Cascaded Multilevel Inverter
Islam et al. Power factor correction for single phase loads using modified vienna rectifier
Rathore et al. A new 15-level asymmetrical multilevel inverter topology with reduced number of devices for different PWM techniques
Kedika et al. Single-phase seven-level inverter with multilevel boost converter for solar photovoltaic systems

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