CN114583991B - Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter - Google Patents

Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter Download PDF

Info

Publication number
CN114583991B
CN114583991B CN202210491267.XA CN202210491267A CN114583991B CN 114583991 B CN114583991 B CN 114583991B CN 202210491267 A CN202210491267 A CN 202210491267A CN 114583991 B CN114583991 B CN 114583991B
Authority
CN
China
Prior art keywords
switching tube
diode
gain
phase
switched
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.)
Active
Application number
CN202210491267.XA
Other languages
Chinese (zh)
Other versions
CN114583991A (en
Inventor
王清媛
汪洪亮
丁永强
吴良材
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.)
Shenzhen Growatt New Energy Technology Co ltd
Original Assignee
Shenzhen Growatt New Energy Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Growatt New Energy Technology Co ltd filed Critical Shenzhen Growatt New Energy Technology Co ltd
Priority to CN202210491267.XA priority Critical patent/CN114583991B/en
Publication of CN114583991A publication Critical patent/CN114583991A/en
Application granted granted Critical
Publication of CN114583991B publication Critical patent/CN114583991B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply, a first inductor, a second inductor, a first switching tube, a third diode, a second switching tube, a third switching tube, a first capacitor, a second capacitor, a load, a first diode and a second diode, wherein the first inductor is connected with the second diode; the positive electrode of the direct current power supply is connected with the first end of the first switching tube; when the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in the discontinuous mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved. The invention also provides a control method of the gain-adjustable single-phase DCAC converter and a three-phase inverter.

Description

Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter
Technical Field
The invention relates to the technical field of inverters, in particular to a gain-adjustable single-phase DCAC converter, a control method and a three-phase DCAC converter.
Background
The inverters are divided into voltage source inverters and current source inverters, and most of the conventional voltage source inverters are voltage reduction circuits, that is, the output ac voltage is lower than the input dc voltage. Therefore, at present, a single-stage Boost circuit (such as a Boost circuit) is added in front of an inverter circuit, so that the inverter becomes a two-stage structure, the size is increased, and the system stability is reduced, so that it is very important to study a single-stage high-gain inverter, and therefore, some researchers have proposed a Z-source inverter, which is an impedance network formed by two inductors and two capacitors and can realize the Boost function, and thus, the Z-source inverter is widely studied.
The current leakage problem of a non-isolated inverter system is mainly solved by two ideas, one idea is that through topology and modulation, scholars at home and abroad propose a plurality of improved topological structures which can be mainly divided into a single-inductor structure and a symmetrical inductor structure, wherein the symmetrical inductor structure can be divided into a direct current side bypass structure and an alternating current side bypass structure, and typical structures comprise H5, H6, improved H6, mixed H6, HERIC and other topological structures. Although these improved topologies and controls reduce leakage current to some extent, they are also only suppressive and do not address the leakage current problem at its root. The other idea is to use a topology structure with input and output being in common with ground, the generation of the leakage current is due to the parasitic capacitance between the photovoltaic array and the ground, and meanwhile, because of the isolation effect of no transformer, the current passes through the parasitic capacitance to form a loop in the circuit, so that the leakage current is generated, and if the topology with input and output being in common with ground is constructed, the parasitic capacitance can be bypassed, so that the problem of the leakage current is fundamentally solved.
Compared with the traditional Z source inverter, the existing inverter is named as a Semi-Z source inverter, as shown in figure 1, and the other is named as a Semi-quasi-Z source inverter, as shown in figure 2, only two switching tubes are used, meanwhile, an impedance network of a Z source is reserved, but a through state of the Z source is not utilized, more, the common ground of input and output is realized, and the problem of leakage current is thoroughly solved, but the circuit has the great defect that the positive gain of the two proposed topologies can only reach 1 to the maximum, and the negative gain can reach infinity, so that the inverter can only achieve 1-time gain to the maximum.
Disclosure of Invention
The invention aims to provide a single-phase DCAC converter with adjustable gain, a control method and a three-phase DCAC converter, and aims to solve the problem that the existing inverter can only achieve 1-time gain at most.
The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply, a first inductor, a second inductor, a first switching tube, a third diode, a second switching tube, a third switching tube, a first capacitor, a second capacitor, a load, a first diode and a second diode, wherein the first inductor is connected with the second diode; the positive electrode of the direct current power supply is connected with the first end of the first switching tube; the second end of the first switch tube is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the second end of the first capacitor, the cathode of the second diode and the first end of the second inductor; the anode of the second diode is connected with the second end of the third switching tube; the negative electrode of the direct current power supply, the first end of the first inductor, the first end of the third switching tube, the second end of the second capacitor and the second end of the load are all grounded.
When the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in the discontinuous mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved.
Further, a cathode of the third diode is connected to the second end of the first inductor and the first end of the first capacitor, an anode of the third diode is connected to the first end of the second switching tube, and a second end of the second switching tube is connected to the second end of the second inductor, the first end of the second capacitor, and the first end of the load.
Further, the first switching tube, the second switching tube and the third switching tube each include any one of an IGBT, a MOSFET or a triode.
Further, the gain-adjustable single-phase DCAC converter includes a first operating mode, in the first operating mode, the third switching tube remains turned off, and at this time, the first switching tube, the third diode and the second switching tube work cooperatively to perform buck inversion, where the third diode and the second switching tube are driven the same, and the first operating mode includes two operating states; in the first working state, the first switch tube is switched on, and the third diode and the second switch tube are switched off; and in the second working state, the first switch tube is switched off, and the third diode and the second switch tube are switched on.
Further, the gain-adjustable single-phase DCAC converter comprises a second operation mode, in the second operation mode, the third diode and the second switch tube are kept off, the first switch tube, the first diode, the second diode, the third switch tube and the second inductor form a Buck circuit, and the Buck circuit is configured by the first switch tube and the third switch tube working cooperatively to perform Buck, and the second operation mode comprises a first operation state and a second operation state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
The invention also provides a control method of the gain-adjustable single-phase DCAC converter, which comprises the following steps: when the desired gain is less than 0 or greater than 1, controlling the single-phase DCAC converter with adjustable gain to work in a first working mode, wherein the single-phase DCAC converter with adjustable gain works in a discontinuous mode, and in the first working mode, the third switching tube is kept off, and at the moment, the first switching tube, the third diode and the second switching tube work together to perform buck inversion, wherein the third diode and the second switching tube are driven to be the same, and the first working mode comprises two working states; in the first working state, the first switch tube is switched on, and the third diode and the second switch tube are switched off; in the second working state, the first switch tube is turned off, and the third diode and the second switch tube are turned on; when 0< desired gain <1, the gain-adjustable single-phase DCAC converter cannot meet an operating condition, and is switched to a second operating mode, in which the third diode and the second switching tube are kept off, the first switching tube, the first diode, the second diode, the third switching tube and the second inductor form a Buck circuit, and the first switching tube and the third switching tube cooperate to perform voltage reduction, and the second operating mode includes a first operating state and a second operating state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
Further, the calculation formula of the gain of the first operation mode is V Co Vin = D/(2D-1); and D is the duty ratio of the first switching tube, and 1-D is the duty ratio of the third diode and the second switching tube.
Further, the calculation formula of the gain of the second operation mode is V Co /Vin = D; and D is the duty ratio of the first switching tube.
The invention also provides a three-phase inverter, which comprises three single-phase DCAC converters with adjustable gains, wherein the three single-phase DCAC converters with adjustable gains are connected in parallel, and the alternating current output end of each single-phase DCAC converter with adjustable gains is used as the three-phase alternating current output end of the three-phase inverter.
Drawings
FIG. 1 is a prior art topology block diagram designated as a Semi-Z source inverter;
FIG. 2 is a prior art topology diagram of a designated Semi-quad-Z source inverter;
fig. 3 is a topology structure diagram of a single-phase DCAC converter with adjustable gain according to the present invention;
FIG. 4 is a block diagram of a topology of a first operating mode of the gain adjustable single phase DCAC converter of FIG. 3;
FIG. 5 is a block diagram of a topology of a first operating state of the gain adjustable single phase DCAC converter of FIG. 4;
FIG. 6 is a block diagram of a second operating state of the gain adjustable single phase DCAC converter of FIG. 4;
FIG. 7 is a block diagram of a second mode of operation of the gain adjustable single phase DCAC converter of FIG. 3;
FIG. 8 is a block diagram of a topology of a first operating state of the gain adjustable single phase DCAC converter of FIG. 7;
FIG. 9 is a block diagram of a topology of a second operating state of the gain adjustable single phase DCAC converter of FIG. 7;
fig. 10 is a schematic diagram illustrating a control method of a single-phase DCAC converter with adjustable gain according to a second embodiment of the present invention;
fig. 11 is a topology structural view of a three-phase inverter in a third embodiment of the invention;
description of main circuit symbols:
first inductor L1 First capacitor C Voltage across L2 V L2
Second inductor L2 Second capacitor Co Voltage across Co V Co
First switch tube S1 Direct current power supply DC Voltage across C V C
Third diode S2 Load voltage Vo DC supply voltage Vin
Second switch tube S3 Load(s) R First diode D1
Third switch tube S4 Voltage across L1 V L1 Second diode D2
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply DC, a first inductor L1, a second inductor L2, a first switching tube S1, a third diode, a second switching tube, a third switching tube S4, a first capacitor C, a second capacitor Co, a load R, a first diode D1 and a second diode D2; the positive electrode of the direct current power supply DC is connected with the first end of the first switching tube S1; a second end of the first switch tube S1 is connected to an anode of the first diode D1, and a cathode of the first diode D1 is connected to a second end of the first capacitor C, a cathode of the second diode D2, and a first end of the second inductor L2, respectively; the anode of the second diode D2 is connected to the second end of the third switching tube S4; the negative electrode of the direct current power supply DC, the first end of the first inductor L1, the first end of the third switching tube S4, the second end of the second capacitor Co, and the second end of the load R are all grounded.
When the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in a discontinuous mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved.
Specifically, in this embodiment, a cathode of the third diode S2 is connected to the second end of the first inductor L1 and the first end of the first capacitor C, an anode of the third diode S2 is connected to the first end of the second switching tube S3, and a second end of the second switching tube S3 is connected to the second end of the second inductor L2, the first end of the second capacitor Co and the first end of the load R.
Specifically, in this embodiment, the first switching tube S1, the second switching tube S3 and the third switching tube S4 are all transistors to realize a switching function, and it should be understood that in other embodiments of the present invention, the first switching tube S1, the second switching tube S3 and the third switching tube S4 may be any one of an IGBT, a MOSFET or a transistor.
Specifically, in this embodiment, the third diode S2 and the second switch tube S3 are connected in series.
Specifically, in this embodiment, the gain-adjustable single-phase DCAC converter includes a first operation mode, in the first operation mode, the third switching tube S4 is kept turned off, and at this time, the first switching tube S1, the third diode S2 and the second switching tube S3 cooperate to perform buck inversion, where the third diode S2 and the second switching tube S3 are driven the same, and the first operation mode includes two operation states; in the first operating state, the first switch tube S1 is turned on, and the third diode S2 and the second switch tube S3 are turned off, as shown in fig. 5. From kirchhoff's voltage law, Vin = V C +V L1 ，V L2 +V Co = Vin; in the second operating state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on. As shown in fig. 6. At this time, V is obtained from kirchhoff's voltage law L1 =V Co ，V C =V L2 . Assuming that the duty cycle of the first switching tube S1 is D, the duty cycles of the third diode S2 and the second switching tube S3 are 1-D, and the following expression is obtained according to the volt-second balance:
D*(Vin−V C )+(1−D)V Co =0，
(Vin−V Co )*D+(1−D)V C =0；
can obtain V Co /Vin = D/(2D-1). The relation expression of the output voltage and the input voltage canIt can be seen that when D is changed from 0 to 0.5, the negative gain is changed from 0 to negative infinity, and when D is changed from 0.5 to 1, the positive gain is changed from positive infinity to 1, so that the mode operates in the discontinuous inversion mode, and the positive gain part of 0-1 is lacked.
Specifically, in this embodiment, the gain-adjustable single-phase DCAC converter includes a second operation mode, in the second operation mode, the third diode S2 and the second switching tube S3 are kept turned off, the first switching tube S1, the first diode D1, the second diode D2, the third switching tube S4, and the second inductor L2 form a Buck circuit, at this time, the first switching tube S1 and the third switching tube S4 cooperate to perform voltage reduction, and the second operation mode includes a first operation state and a second operation state; in the first operating state, the first switching tube S1 is turned on, and the third switching tube S4 is turned off, as shown in fig. 8, at this time, Vin = V can be obtained from kirchhoff' S voltage law L2 +V Co (ii) a In the second working state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on, as shown in fig. 9, where V is obtained from kirchhoff' S voltage law L2 =−V Co . If the duty ratio of the first switching tube S1 is D, the duty ratio of the third switching tube S4 is 1-D, and the following expression, -V can be obtained according to the volt-second balance law by combining the above expressions Co *(1−D)+D(Vin−V Co ) = 0; can obtain V Co and/Vin = D. It can be seen from the relational expression of the output voltage and the input voltage that as D changes from 0 to 1, the output ratio is less than 1, so the operation mode is in the forward buck mode. The second working mode is matched with the first working mode, so that the high-gain inverter can be realized, the second working mode supplements the part which is absent in the first working mode and has 0-1 positive direction, and the positive and negative bidirectional high gain is realized.
The invention also provides a control method of the gain-adjustable single-phase DCAC converter, which comprises the following steps: when the desired gain is less than 0 or greater than 1, controlling the single-phase DCAC converter with adjustable gain to operate in a first operation mode, the single-phase DCAC converter with adjustable gain operates in a discontinuous mode, and in the first operation mode, the third switching tube S4 is kept off, and at this time, the first switching tube S1, the third diode S2 and the second switching tube S3 cooperate to perform inversion, wherein the third diode S2 and the second switching tube S3 are driven to be the same, and the first operation mode includes two operation states; in the first working state, the first switch tube S1 is turned on, and the third diode 2 and the second switch tube S3 are turned off; in the second operating state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on.
As shown in fig. 5, in the first operating state, Vin = V, which is obtained from kirchhoff's voltage law C +V L1 ，V L2 +V Co = Vin; in the second operating state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on. As shown in fig. 6. At this time, V is obtained from kirchhoff's voltage law L1 =V Co ，V C =V L2 . Assuming that the duty cycle of the first switching tube S1 is D, the duty cycles of the third diode S2 and the second switching tube S3 are 1-D, and the following expression is obtained according to the volt-second balance:
D*(Vin−V C )+(1−D)V Co =0，
(Vin−V Co )*D+(1−D)V C =0；
can obtain V Co /Vin = D/(2D-1). It can be seen from the relational expression of the output voltage and the input voltage that when D is changed from 0 to 0.5, the negative gain is changed from 0 to negative infinity, and when D is changed from 0.5 to 1, the positive gain is changed from positive infinity to 1, so that the mode works in the discontinuous inversion mode, and the positive gain part of 0-1 is lacked.
When 0< the desired gain <1, the gain-adjustable single-phase DCAC converter cannot meet the operating condition, and the gain-adjustable single-phase DCAC converter is switched to a second operating mode, where in the second operating mode, the third diode S2 and the second switching tube S3 are kept turned off, the first switching tube S1, the first diode D1, the second diode D2, the third switching tube S4, and the second inductor L2 form a Buck circuit, and at this time, the first switching tube S1 and the third switching tube S4 cooperate to perform voltage reduction, and the second operating mode includes a first operating state and a second operating state; in the first working state, the first switching tube S1 is turned on, and the third switching tube S4 is turned off; in the second working state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on.
Specifically, as shown in fig. 8, in the first operating state, Vin = V can be obtained from kirchhoff's voltage law L2 +V Co (ii) a In the second working state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on, as shown in fig. 9, where V is obtained from kirchhoff' S voltage law L2 =−V Co . If the duty ratio of the first switching tube S1 is D, the duty ratio of the third switching tube S4 is 1-D, and the following expression, -V can be obtained according to the volt-second equilibrium law by combining the above expressions Co *(1−D)+D(Vin−V Co ) = 0; can obtain V Co and/Vin = D. It can be seen from the relational expression of the output voltage and the input voltage that as D changes from 0 to 1, the output ratio is less than 1, so the operation mode is in the forward buck mode. The second working mode is matched with the first working mode, so that the high-gain inverter can be realized, the second working mode supplements the part which is absent in the first working mode and has 0-1 positive direction, and the positive and negative bidirectional high gain is realized.
As shown in fig. 11, a three-phase inverter according to a third embodiment of the present invention includes three gain-adjustable single-phase DCAC converters described above, where the three gain-adjustable single-phase DCAC converters are connected in parallel, and an ac output terminal of each gain-adjustable single-phase DCAC converter is used as a three-phase ac output terminal of the three-phase inverter. Specifically, it is assumed that voltages passing through the three loads R are a-phase voltage, B-phase voltage, and C-phase voltage of three-phase voltages, respectively. If the modulation wave generating the A-phase voltage is Msin (ꞷ t), the modulation wave generating the B-phase voltage is Msin (ꞷ t +2 pi/3) and the modulation wave generating the C-phase voltage is Msin (ꞷ t-2 pi/3) according to the principle of three-phase inversion modulation, and each phase passes through the working modes of FIGS. 4 to 9, so that three-phase inversion can be realized.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (8)

1. A gain-adjustable single-phase DCAC converter is characterized by comprising a direct-current power supply, a first inductor, a second inductor, a first switch tube, a third diode, a second switch tube, a third switch tube, a first capacitor, a second capacitor, a load, a first diode and a second diode;
the positive electrode of the direct current power supply is connected with the first end of the first switching tube;
the second end of the first switch tube is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the second end of the first capacitor, the cathode of the second diode and the first end of the second inductor;
the anode of the second diode is connected with the second end of the third switching tube;
a cathode of the third diode is connected to the second end of the first inductor and the first end of the first capacitor, an anode of the third diode is connected to the first end of the second switching tube, and the second end of the second switching tube is connected to the second end of the second inductor, the first end of the second capacitor, and the first end of the load;
the negative electrode of the direct current power supply, the first end of the first inductor, the first end of the third switching tube, the second end of the second capacitor and the second end of the load are all grounded.
2. The gain-adjustable single-phase DCAC converter according to claim 1, wherein said first switch tube, said second switch tube and said third switch tube comprise any one of IGBT, MOSFET and triode.
3. The gain-adjustable single-phase DCAC converter according to claim 1, wherein the gain-adjustable single-phase DCAC converter comprises a first operation mode, in which the third switching tube is kept turned off, and the first switching tube, the third diode and the second switching tube cooperate to perform buck inversion, wherein the third diode and the second switching tube are driven the same, and the first operation mode comprises two operation states;
in a first working state, the first switching tube is switched on, and the third diode and the second switching tube are switched off;
and in a second working state, the first switch tube is switched off, and the third diode and the second switch tube are switched on.
4. The gain-adjustable single-phase DCAC converter according to claim 1, wherein the gain-adjustable single-phase DCAC converter comprises a second operation mode, in which the third diode and the second switch tube are kept off, and the first switch tube, the first diode, the second diode, the third switch tube and the second inductor form a Buck circuit, and the Buck circuit is configured by the first switch tube and the third switch tube working together to perform Buck, and the second operation mode comprises a first operation state and a second operation state;
in the first working state, the first switching tube is switched on, and the third switching tube is switched off;
and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
5. A method for controlling a gain-adjustable single-phase DCAC converter, the method being implemented by the single-phase DCAC converter of claim 1, the method comprising:
when the desired gain is less than 0 or greater than 1, controlling the single-phase DCAC converter with the adjustable gain to work in a first working mode, wherein the single-phase DCAC converter with the adjustable gain works in a discontinuous mode, and in the first working mode, the third switching tube is kept off, and at the moment, the first switching tube, the third diode and the second switching tube work together to perform buck inversion, wherein the third diode and the second switching tube are driven to be the same, and the first working mode comprises two working states; in a first working state, the first switch tube is switched on, and the third diode and the second switch tube are switched off; in a second working state, the first switching tube is turned off, and the third diode and the second switching tube are turned on;
when 0< desired gain <1, the gain-adjustable single-phase DCAC converter cannot meet an operating condition, and is switched to a second operating mode, in which the third diode and the second switching tube are kept off, the first switching tube, the first diode, the second diode, the third switching tube and the second inductor form a Buck circuit, and the first switching tube and the third switching tube cooperate to perform voltage reduction, and the second operating mode includes a first operating state and a second operating state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
6. The method as claimed in claim 5, wherein the gain of the first operation mode is calculated as V Co /Vin=D/(2D−1)；
Wherein D is the duty ratio of the first switch tube, 1-D is the duty ratio of the third diode and the second switch tube, and V Co Is the voltage across the second capacitor, Vin is the dc supply voltage.
7. The method as claimed in claim 5, wherein the gain of the second operation mode is calculated as V Co /Vin=D；
Wherein D is the duty ratio of the first switch tube, V Co Is the voltage across the second capacitor, Vin is the dc supply voltage.
8. A three-phase inverter comprising three gain-adjustable single-phase DCAC converters according to any one of claims 1 to 4, wherein the three gain-adjustable single-phase DCAC converters are connected in parallel, and the AC output terminal of each of the gain-adjustable single-phase DCAC converters is used as the three-phase AC output terminal of the three-phase inverter.
CN202210491267.XA 2022-05-07 2022-05-07 Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter Active CN114583991B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210491267.XA CN114583991B (en) 2022-05-07 2022-05-07 Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210491267.XA CN114583991B (en) 2022-05-07 2022-05-07 Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter

Publications (2)

Publication Number Publication Date
CN114583991A CN114583991A (en) 2022-06-03
CN114583991B true CN114583991B (en) 2022-08-19

Family

ID=81769235

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210491267.XA Active CN114583991B (en) 2022-05-07 2022-05-07 Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter

Country Status (1)

Country Link
CN (1) CN114583991B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958823A (en) * 2016-06-28 2016-09-21 华南理工大学 Current continuous high-gain switch voltage rise quasi-Z-source converter circuit
CN111193426A (en) * 2020-01-14 2020-05-22 燕山大学 Non-isolated high-gain single-phase inverter and control method thereof
CN111865129A (en) * 2020-07-09 2020-10-30 南京航空航天大学 Four-switch single-phase single-stage type switch boosting inverter

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7872441B2 (en) * 2007-06-29 2011-01-18 GM Global Technology Operations LLC Systems and methods for operating Z-source inverter inductors in a continuous current mode
EE05654B1 (en) * 2011-02-28 2013-04-15 Tallinna Tehnikaülikool Method for Generating Lines with Block-Controlled HV or Multi Phase Impedance, Quasi-Impedance, and Transimpedance
JP5967702B2 (en) * 2012-06-01 2016-08-10 東洋電機製造株式会社 Power converter
CN106602869A (en) * 2017-01-26 2017-04-26 华南理工大学 Common-ground high-gain Z source DC-DC convertor
CN109861576A (en) * 2019-04-16 2019-06-07 哈尔滨工业大学 A kind of Z-source inverter allowing work in discontinuous conduct mode
CN110635684B (en) * 2019-09-09 2021-08-20 南通大学 Single-tube quasi-Z-source Boost converter
US10700614B1 (en) * 2019-10-25 2020-06-30 Institute Of Electrical Engineering, Chinese Academy Of Sciences Series-type photovoltaic high-voltage DC grid-connected converter topological circuit and modulation method thereof
CN111969847B (en) * 2020-08-12 2021-09-07 西安交通大学 Staggered non-isolated switch capacitor network high-gain soft switch converter and control method thereof
CN112019076B (en) * 2020-10-13 2021-04-09 深圳格瑞特新能源有限公司 High-gain single-phase inverter, control method and three-phase inverter
CN112019075B (en) * 2020-11-02 2021-04-09 深圳格瑞特新能源有限公司 High-gain single-phase inverter, control method and three-phase inverter
CN112583252B (en) * 2020-12-04 2021-09-07 南通大学 High-power-density high-gain converter and control method thereof
CN112737316A (en) * 2020-12-28 2021-04-30 河北建投新能源有限公司 quasi-Z-source inverter and power supply system
CN113541500A (en) * 2021-06-24 2021-10-22 南京航空航天大学 Isolated semi-accurate Z source direct current boost converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958823A (en) * 2016-06-28 2016-09-21 华南理工大学 Current continuous high-gain switch voltage rise quasi-Z-source converter circuit
CN111193426A (en) * 2020-01-14 2020-05-22 燕山大学 Non-isolated high-gain single-phase inverter and control method thereof
CN111865129A (en) * 2020-07-09 2020-10-30 南京航空航天大学 Four-switch single-phase single-stage type switch boosting inverter

Also Published As

Publication number Publication date
CN114583991A (en) 2022-06-03

Similar Documents

Publication Publication Date Title
CN112019075B (en) High-gain single-phase inverter, control method and three-phase inverter
CN112019076B (en) High-gain single-phase inverter, control method and three-phase inverter
CN108988676B (en) Single-stage isolated bidirectional AC-DC converter
CN107959429B (en) Coupling inductor boost inverter and control method thereof
CN114583990B (en) High-gain single-phase inverter, control method and three-phase inverter
CN114513125A (en) Single-phase inverter and control method and control system thereof
CN110098753B (en) Multi-output transformer-free symmetric hybrid converter and modulation method thereof
CN114583991B (en) Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter
CN112202351A (en) Single-stage isolated three-phase AC/DC rectifier of wide-range soft switch
CN113659863B (en) Double-end common-ground inverter
CN215186466U (en) Wide output range&#39;s two-way step-up and step-down circuit and test power supply
CN212115161U (en) DCDC converter suitable for wide voltage input range
CN115528916A (en) Control circuit and control method of four-switch buck-boost converter
CN111010031B (en) Improved high-gain Boost-Sepic converter
CN110729913B (en) Single-stage high-gain five-switch Boost type inverter
CN114285281A (en) Quasi-switching capacitor type high-gain DC-DC converter
CN109245584B (en) High-energy-efficiency dual-input inverter suitable for distributed photovoltaic grid-connected system
CN113595427B (en) Double-input double-boosting leakage-free inverter and control circuit and method thereof
Li et al. Interleaved high step-up converter with built-in transformer and voltage doubler for PV grid-connected generation systems
Kumari et al. Transformer less high voltage gain step-up DC-DC converter using Cascode technique
CN113904576B (en) Integrated boost photovoltaic grid-connected inverter and control method thereof
Maheri et al. A new high step-up switched-capacitor/inductor based DC-DC converter
WO2022036769A1 (en) Alternating-current chopper circuit and single-phase alternating-current electric motor drive system
CN113507225B (en) Non-isolated three-phase rectification converter and control method thereof
CN110149064B (en) Control method of double-input boost inverter

Legal Events

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