CN117335666A - Three-port DC-AC converter based on interleaved Boost and double active bridges - Google Patents
Three-port DC-AC converter based on interleaved Boost and double active bridges Download PDFInfo
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- CN117335666A CN117335666A CN202311273118.7A CN202311273118A CN117335666A CN 117335666 A CN117335666 A CN 117335666A CN 202311273118 A CN202311273118 A CN 202311273118A CN 117335666 A CN117335666 A CN 117335666A
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- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 230000000295 complement effect Effects 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 32
- 230000009977 dual effect Effects 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/305—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M3/315—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M3/3155—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of the output voltage or current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M7/505—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 thyratron or thyristor type requiring extinguishing means
- H02M7/515—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/521—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses a three-port DC-AC converter based on staggered Boost and double active bridges, wherein the circuit comprises a transformer, a first bridge arm, a second bridge arm, a first inductor, a first capacitor, a first direct current port, a second direct current port, a third bridge arm, a fourth bridge arm, a second inductor, a second capacitor, a full-bridge inverter circuit, a filter circuit and an alternating current port; the switching signals of the two switching tubes contained in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are complementary. According to the three-port DC-AC converter, any one of the first direct current port and the second direct current port is set to input direct current, two paths of direct current input are realized under the condition that circuit devices are fewer, and the circuit structure is greatly simplified under the same application function.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a three-port DC-AC converter based on staggered Boost and double active bridges.
Background
The double active bridge type single-stage DC-AC converter is a circuit device widely applied in recent years, realizes bidirectional buck-boost AC-DC conversion through a primary structure, and can realize soft switching operation of all power switching devices; and because the electrolytic capacitor does not contain a large capacitance value, the power density and the service life of the electrolytic capacitor are obviously improved compared with a two-stage structure. Therefore, the double-active bridge type single-stage DC-AC converter has the advantages of bidirectional wide voltage conversion range, high efficiency, long service life, high power density and the like, well meets the special requirements of an alternating current grid-connected energy storage system, and has wide application prospect.
However, the DC side of the dual active bridge type single stage DC-AC converter in the conventional method generally includes only one DC input port, and if multiple DC inputs are required, multiple DC-DC topologies are often required to be used in parallel, which requires more devices and has higher cost. Multiport converters (MPCs) are an important component of renewable energy based power systems that can be used with fewer devices to achieve multiple dc inputs, helping to solve the above problems, whereas MPCs in prior art approaches are typically used for dc-to-dc power conversion, requiring additional dc-ac stages when renewable energy is powering the grid or any ac equipment. Therefore, when the dual active bridge type single-stage DC-AC converter in the prior art faces the situation that multiple paths of direct current inputs exist, such as photovoltaic power generation, the problem that the circuit structure is complex due to the fact that multiple DC-DC topologies are used in parallel often exists.
Disclosure of Invention
The embodiment of the application provides a three-port DC-AC converter based on staggered Boost and double active bridges, which aims to solve the problem that a circuit structure is complex due to the fact that a plurality of DC-DC topologies are used in parallel when the traditional double active bridge type single-stage DC-AC converter faces the condition of multipath direct current input.
To solve the above technical problems, an embodiment of the present application discloses a three-port DC-AC converter based on interleaved Boost and dual active bridges, including:
a transformer comprising a first winding and a second winding, the first winding comprising a first end and a second end, the second winding comprising a third end and a fourth end;
the first bridge arm comprises a first switching tube and a second switching tube which are connected in series, and a first connection point is formed by connecting the first switching tube and the second switching tube;
the second bridge arm comprises a third switching tube and a fourth switching tube which are connected in series, a second connection point is formed between the third switching tube and the fourth switching tube, the second connection point is electrically connected with the second end of the first winding, and the second bridge arm is connected with the first bridge arm in parallel to form a third connection point and a fourth connection point;
one end of the first inductor is electrically connected with the first end of the first winding, and the other end of the first inductor is electrically connected with the first connecting point;
the two ends of the first capacitor are respectively and electrically connected with the third connecting point and the fourth connecting point;
the output end of the first direct current port is electrically connected with the third connecting point and the fourth connecting point respectively;
the output end of the second direct current port is electrically connected with the first connecting point, the second connecting point and the fourth connecting point respectively;
the third bridge arm comprises a fifth switching tube and a sixth switching tube which are connected in series, and a fifth connection point is formed by connecting the fifth switching tube and the sixth switching tube;
the fourth bridge arm comprises a seventh switching tube and an eighth switching tube which are connected in series, a sixth connection point is formed between the seventh switching tube and the eighth switching tube, the sixth connection point is electrically connected with the fourth end of the second winding, and the fourth bridge arm is connected with the fifth bridge arm in parallel to form a seventh connection point and an eighth connection point;
one end of the second inductor is electrically connected with the third end of the second winding, and the other end of the second inductor is electrically connected with the fifth connection point;
the two ends of the second capacitor are respectively and electrically connected with the seventh connection point and the eighth connection point;
the full-bridge inverter circuit comprises a fifth end, a sixth end, a seventh end and an eighth end, wherein the fifth end is electrically connected with the seventh connection point, and the sixth end is electrically connected with the eighth connection point;
the input end of the filter circuit is electrically connected with the seventh end and the eighth end respectively;
the input end of the alternating current port is electrically connected with the output end of the filter circuit;
the switching signals of the two switching tubes contained in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are complementary.
The three-port DC-AC converter based on the staggered Boost and the double active bridge, wherein the duty ratio of the switching signals of one switching tube on at least one of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm is a preset threshold value.
The three-port DC-AC converter based on the staggered Boost and the double active bridge, wherein the duty ratio of the switching signals of the two switching tubes on each of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm is a preset threshold value, and the preset threshold value is 50%.
The three-port DC-AC converter based on the staggered Boost and the double active bridges further comprises a third inductor and a fourth inductor;
one end of the third inductor is electrically connected with the first connection point, the other end of the third inductor is electrically connected with the fourth inductor to form a ninth connection point, one end of the fourth inductor is electrically connected with the second connection point, and the ninth connection point is electrically connected with the output end of the second direct current port.
The input end of the first direct current port and the input end of the second direct current port are respectively and electrically connected with two PV ends of the photovoltaic panel, and the output end of the alternating current port is connected with a power grid.
The three-port DC-AC converter based on the staggered Boost and the double active bridges is characterized in that the input end of the first direct current port is electrically connected with a battery, the input end of the second direct current port is electrically connected with the PV end of the photovoltaic panel, and the output end of the alternating current port is connected with a power grid; or (b)
The input end of the first direct current port is electrically connected with the PV end of the photovoltaic panel, the input end of the second direct current port is electrically connected with the battery, and the output end of the alternating current port is connected with a power grid.
The full-bridge inverter circuit comprises a fifth bridge arm and a sixth bridge arm, wherein the fifth bridge arm and the sixth bridge arm are connected in parallel between the seventh connection point and the eighth connection point;
the fifth bridge arm comprises a ninth switching tube and a tenth switching tube which are connected in series, a tenth connection point is formed by connecting the ninth switching tube and the tenth switching tube, and the tenth connection point is electrically connected with the input end of the filter circuit;
the sixth bridge arm comprises an eleventh switching tube and a twelfth switching tube which are connected in series, an eleventh connection point is formed by connecting the eleventh switching tube and the twelfth switching tube, and the eleventh connection point is electrically connected with the input end of the filter circuit;
the switching signals of the two switching tubes contained in the fifth bridge arm and the sixth bridge arm are complementary, and the duty ratio of at least one switch in the fifth bridge arm and the sixth bridge arm is 50%.
The three-port DC-AC converter based on staggered Boost and double active bridges, wherein the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube, the eighth switching tube, the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are any one of a diode, a MOS tube and a thyristor.
The three-port DC-AC converter based on the staggered Boost and the double active bridges, wherein the ninth switching tube and the tenth switching tube are thyristors.
The three-port DC-AC converter based on the staggered Boost and the double active bridges, wherein the filter circuit comprises a fifth inductor, a sixth inductor and a third capacitor;
one end of the fifth inductor is electrically connected with the tenth connection point, the other end of the fifth inductor is electrically connected with the sixth inductor to form a twelfth connection point, one end of the sixth inductor is electrically connected with the input end of the alternating current port, one end of the third capacitor is electrically connected with the twelfth connection point, and the other ends of the capacitors are respectively electrically connected with the eleventh connection point and the input end of the alternating current port.
The embodiment of the application discloses a three-port DC-AC converter based on staggered Boost and double active bridges, wherein the circuit comprises a transformer, a first bridge arm, a second bridge arm, a first inductor, a first capacitor, a first direct current port, a second direct current port, a third bridge arm, a fourth bridge arm, a second inductor, a second capacitor, a full-bridge inverter circuit, a filter circuit and an alternating current port; the switching signals of the two switching tubes contained in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are complementary. According to the three-port DC-AC converter, any one of the first direct current port and the second direct current port is set to input direct current, two paths of direct current input are realized under the condition that circuit devices are fewer, and the circuit structure is greatly simplified under the same application function.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit configuration diagram of a three-port DC-AC converter based on interleaved Boost and dual active bridges according to an embodiment of the present application;
fig. 2 is an equivalent circuit structure diagram of a three-port DC-AC converter based on interleaved Boost and dual active bridges according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another equivalent circuit of a three-port DC-AC converter based on interleaved Boost and dual active bridges according to an embodiment of the present application;
FIG. 4 is a schematic diagram of another equivalent circuit of a three-port DC-AC converter based on interleaved Boost and dual active bridges according to an embodiment of the present application;
fig. 5 is a schematic diagram of another equivalent circuit of a three-port DC-AC converter based on interleaved Boost and dual active bridges according to an embodiment of the present application.
Reference numerals: 20. a full-bridge inverter circuit; 30. a filter circuit; port-1, the first DC Port; port-2, the second direct current Port; port-3, AC Port; l1, a first inductor; l2, a second inductor; l3, a third inductor; l4, a fourth inductor; l5, a fifth inductor; l6, a sixth inductor; s1, a first switching tube; s2, a second switching tube; s3, a third switching tube; s4, a fourth switching tube; s5, a fifth switching tube; s6, a sixth switching tube; s7, a seventh switching tube; s8, an eighth switching tube; q1, a ninth switching tube; q2, a tenth switching tube; s9, an eleventh switching tube; s10, a twelfth switching tube; c1, a first capacitor; c3, a second capacitor; c2, a third capacitor; t, a transformer; 1. a first connection point; 2. a second connection point; 3. a third connection point; 4. a fourth connection point; 5. a fifth connection point; 6. a sixth connection point; 7. a seventh connection point; 8. an eighth connection point; 9. a ninth connection point; 10. and a tenth connection point.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the application discloses a three-port DC-AC converter based on staggered Boost and double active bridges, as shown in fig. 1, wherein the three-port DC-AC converter comprises: a transformer T comprising a first winding and a second winding, the first winding comprising a first end and a second end, the second winding comprising a third end and a fourth end; the first bridge arm comprises a first switching tube S1 and a second switching tube S2 which are connected in series, and the first switching tube S1 and the second switching tube S2 are connected to form a first connection point 1; the second bridge arm comprises a third switching tube S3 and a fourth switching tube S4 which are connected in series, a second connection point 2 is formed by connecting the third switching tube S3 and the fourth switching tube S4, the second connection point 2 is electrically connected with the second end of the first winding, and the second bridge arm is connected with the first bridge arm in parallel to form a third connection point 3 and a fourth connection point 4; a first inductor L1, wherein one end of the first inductor L1 is electrically connected to the first end of the first winding, and the other end of the first inductor L1 is electrically connected to the first connection point 1; the two ends of the first capacitor C1 are respectively and electrically connected with the third connecting point 3 and the fourth connecting point 4; the output end of the first direct current Port-1 is electrically connected with the third connection point 3 and the fourth connection point 4 respectively; the output end of the second direct current Port-2 is electrically connected with the first connection point 1, the second connection point 2 and the fourth connection point 4 respectively; the third bridge arm comprises a fifth switching tube S5 and a sixth switching tube S6 which are connected in series, and the fifth switching tube S5 and the sixth switching tube S6 are connected to form a fifth connection point 5; a fourth bridge arm, which comprises a seventh switching tube S7 and an eighth switching tube S8 which are connected in series, wherein a sixth connection point 6 is formed by connecting the seventh switching tube S7 and the eighth switching tube S8, the sixth connection point 6 is electrically connected with a fourth end of the second winding, and the fourth bridge arm is connected with the fifth bridge arm in parallel to form a seventh connection point 7 and an eighth connection point 8; a second inductor L2, wherein one end of the second inductor L2 is electrically connected to the third end of the second winding, and the other end of the second inductor L2 is electrically connected to the fifth connection point 5; the two ends of the second capacitor C3 are respectively and electrically connected with the seventh connection point 7 and the eighth connection point 8; the full-bridge inverter circuit 20 includes a fifth end, a sixth end, a seventh end, and an eighth end, where the fifth end is electrically connected to the seventh connection point 7, and the sixth end is electrically connected to the eighth connection point 8; the input end of the filter circuit 30 is electrically connected with the seventh end and the eighth end respectively; an alternating current Port-3, wherein the input end of the alternating current Port-3 is electrically connected with the output end of the filter circuit 30; wherein, the switch signals of two switch tubes included in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are all complementary.
The three-Port DC-AC converter provided in this embodiment of the present invention is composed of a three-part circuit structure, and includes a Boost converter configured at a front stage, a full-bridge inverter circuit 20 and a filter circuit 30, where the Boost converter is a three-Port DC-DC Boost circuit based on staggered Boost and dual active bridges, a first DC Port-1 and a second DC Port-2 of the Boost converter are both DC input ports, that is, the Boost converter includes two DC input ends, a control switch signal (for example, the corresponding switch signal is output through an MCU control signal to control the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the fifth switch tube S5, the sixth switch tube S6, the seventh switch tube S7 and the eighth switch tube S8 respectively) is used to implement Boost and bidirectional flow of energy, a rear-stage DC-AC converter (DC-AC) is configured as the full-bridge inverter circuit 20, and the full-bridge inverter circuit 20 can output AC power after being filtered by the full-bridge inverter circuit 30, so that AC power is output after being connected to meet the requirements of the inverter circuit. The two connection ends of the filter circuit 30 are a phase line connection end and a zero line connection end respectively, and the two connection ends of the filter circuit 30 are combined into an alternating current Port-3. The three-Port DC-AC converter comprises three ports, namely a first direct current Port-1, a second direct current Port-2 and an alternating current Port-3, and the three ports are introduced to enable the converter structure to realize two paths of direct current input under the condition that required devices are fewer; and the introduction of the staggered Boost structure enables the converter structure to achieve dc-side to dc-side energy transfer relative to a conventional topology circuit without transformer T isolation. Therefore, the three-port DC-AC converter does not need a three-winding transformer T, and can realize the use function of corresponding two paths of DC input by only needing one group of transformers T, thereby greatly simplifying the circuit structure. The switching signals of the two switching tubes contained in one bridge arm are complementary, namely, the switching signal of one switching tube is on, and the switching signal of the other switching tube is off.
In a more specific embodiment, the duty ratio of the switching signal of one of the switching tubes on at least one of the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm is a preset threshold. The duty ratios of the switching signals of the two switching tubes on each of the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are preset thresholds, and the preset thresholds are 50%.
Furthermore, on the premise that the duty ratios of the switching signals of the two switching tubes on the bridge arm are complementary, the duty ratios of the switching signals of the two switching tubes on the bridge arm can be set to be preset thresholds. Further, in order to improve the circuit conversion effect, the duty ratios of the switching signals of the two switching tubes on all bridge arms may be set to be preset thresholds, where the preset thresholds may be set to be 50%.
In a more specific embodiment, the inductor further comprises a third inductor L3 and a fourth inductor L4; one end of the third inductor L3 is electrically connected to the first connection point 1, the other end of the third inductor L3 is electrically connected to the fourth inductor L4 to form a ninth connection point 9, one end of the fourth inductor L4 is electrically connected to the second connection point 2, and the ninth connection point 9 is electrically connected to the output end of the second dc Port-2.
In a more specific embodiment, the input end of the first direct current Port-1 and the input end of the second direct current Port-2 are respectively and electrically connected with two PV ends of the photovoltaic panel, and the output end of the alternating current Port-3 is connected to the power grid. Specifically, the input end of the first direct current Port Port-1 is electrically connected with a battery, the input end of the second direct current Port Port-2 is electrically connected with the PV end of the photovoltaic panel, and the output end of the alternating current Port Port-3 is connected with a power grid; or the input end of the first direct current Port Port-1 is electrically connected with the PV end of the photovoltaic panel, the input end of the second direct current Port Port-2 is electrically connected with the battery, and the output end of the alternating current Port Port-3 is connected with the power grid.
The three-Port DC-AC converter has various and flexible use occasions, can be used in a photovoltaic micro-inverter, and can be used as two ports to be respectively connected with a PV1 end (a first photovoltaic input end) and a PV2 end (a second photovoltaic input end) of a photovoltaic panel, and an alternating current Port-3 is used as an output Port to be connected with a power grid, so that the PV1 and the PV2 can supply energy to the power grid together to realize a structure similar to one-to-two in micro-inversion. The first direct current Port-1 can be connected with the battery, the second direct current Port-2 is connected with the PV end (photovoltaic input end) of the photovoltaic panel, the alternating current Port-3 is connected with the power grid, the photovoltaic panel can be used for generating electricity to transmit energy to the power grid, the energy of the photovoltaic panel can be stored in the battery through controlling the working mode, and the photovoltaic panel and the battery can be controlled to charge the power grid together when the output voltage of the photovoltaic panel is too low, so that the working mode is flexible and various.
In a more specific embodiment, the full-bridge inverter circuit 20 includes a fifth leg and a sixth leg, where the fifth leg and the sixth leg are connected in parallel between the seventh connection point 7 and the eighth connection point 8; the fifth bridge arm includes a ninth switching tube Q1 and a tenth switching tube Q2 connected in series, a tenth connection point 10 is formed by connecting the ninth switching tube Q1 and the tenth switching tube Q2, and the tenth connection point 10 is electrically connected with the input end of the filter circuit 30; the sixth bridge arm comprises an eleventh switching tube S9 and a twelfth switching tube S10 which are connected in series, an eleventh connection point is formed by connecting the eleventh switching tube S9 and the twelfth switching tube S10, and the eleventh connection point is electrically connected with the input end of the filter circuit 30; the switching signals of the two switching tubes contained in the fifth bridge arm and the sixth bridge arm are complementary, and the duty ratio of at least one switch in the fifth bridge arm and the sixth bridge arm is 50%. The first switching tube S1, the second switching tube S2, the third switching tube S3, the fourth switching tube S4, the fifth switching tube S5, the sixth switching tube S6, the seventh switching tube S7, the eighth switching tube S8, the ninth switching tube Q1, the tenth switching tube Q2, the eleventh switching tube S9 and the twelfth switching tube S10 are any one of diodes, MOS transistors and thyristors.
Specifically, the switching tubes included in the boost converter may be all MOS tubes, and the switching signals are input by the gates of the MOS tubes; the switching tube included in the boost converter can also be a diode with a unidirectional conduction function, and one side of the diode is connected in series with a control switch which can be used for receiving a switching signal to control the on/off of the control switch, so that the purpose of controlling the duty ratio of the diode through the switching signal is realized.
In an exemplary embodiment, as shown in fig. 1, the switching transistors included in the boost converter are all MOS transistors, and the first switching transistor S1, the second switching transistor S2, the third switching transistor S3, the fourth switching transistor S4, the fifth switching transistor S5, the sixth switching transistor S6, the seventh switching transistor S7, and the eighth switching transistor S8 are respectively a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, and an eighth MOS transistor. The drain electrode of the first MOS tube is connected with the drain electrode of the third MOS tube, and the connection point is used as a first connection end of the boost converter; one end of the third inductor L3 is connected with one end of the fourth inductor L4, and a connection point is used as a second connection end of the boost converter; the source electrode of the second MOS tube is connected with the source electrode of the fourth MOS tube, and the connection point is used as a third connection end of the boost converter; the first connecting end and the third connecting end are combined into a first direct current Port-1; the second connecting end and the third connecting end are combined into a second direct current Port-2; the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the other end of the third inductor L3 and one end of the first inductor L1; the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube, the other end of the fourth inductor L4 and one end of the first winding in the transformer T; the other end of the first inductor L1 is connected with the other end of the first winding in the transformer T; one end of a second winding in the transformer T is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected with the source electrode of the fifth MOS tube and the drain electrode of the sixth MOS tube, and the other end of the second winding in the transformer T is connected with the source electrode of the seventh MOS tube and the drain electrode of the eighth MOS tube; the drain electrode of the fifth MOS tube is connected with the drain electrode of the sixth MOS tube, and the connection point is used as the first conversion end of the boost converter and is connected with the first inversion end of the full-bridge inverter circuit 20; the source electrode of the sixth MOS transistor is connected to the source electrode of the eighth MOS transistor, and the connection point is used as the second conversion end of the boost converter and connected to the second inversion end of the full-bridge inverter circuit 20; the two inversion connection ends of the full-bridge inverter circuit 20 are respectively connected with the two filtering connection ends of the filtering circuit 30; the two connection terminals of the filter circuit 30 are combined to be an ac Port-3.
The three-Port DC-AC converter comprises three ports, namely a first direct current Port-1, a second direct current Port-2 and an alternating current Port-3, so that energy can be transmitted from the first direct current Port-1 to the alternating current Port-3, namely the first direct current Port-1 inputs direct current, and the alternating current Port-3 outputs alternating current; or energy is transmitted from the second direct current Port-2 to the alternating current Port-3, namely the second direct current Port-2 inputs direct current and the alternating current Port-3 outputs alternating current; the energy can be transmitted from the second direct current Port-2 to the first direct current Port-1, so that the second direct current Port-2 inputs direct current, and the first direct current Port-1 outputs direct current; furthermore, the energy can be transmitted from the first DC Port Port-1 and the second DC Port Port-2 to the AC Port Port-3 at the same time, the first direct current Port-1 and the second direct current Port-2 simultaneously input direct current, and the alternating current Port-3 outputs alternating current. That is, the three-port DC-AC converter can realize four application functions, so that the application scene of the three-port DC-AC converter is greatly expanded, and the flexibility of circuit use is improved.
The control method of the three-port DC-AC converter is simpler, and is basically the same as that of a double-active-bridge DC-AC converter in the prior art, the duty ratio of all switching signals is firstly configured to be constant at 50%, the complementation of the switching signals of the upper switching tube and the lower switching tube of the same bridge arm is ensured (the switching signal of one switching tube is conducted, the switching signal of the other switching tube is disconnected), the phase shift angle of the switching signal between the first switching tube S1 and the fourth switching tube S4 is defined as D1, the phase shift angle of the switching signal between the first switching tube S1 and the fifth switching tube S5 is defined as D2, and the phase shift angle of the switching signal between the fifth switching tube S5 and the eighth switching tube S8 is ensured to be consistent, so that the three-port DC-AC converter can be switched between the working states only by controlling the values of the D1 (D3) and the D2. The first working mode is that energy is transmitted from a first direct current Port Port-1 to an alternating current Port Port-3, and the equivalent circuit structure diagram is shown in FIG. 2; the second working mode is that energy is transmitted from a second direct current Port-2 to an alternating current Port-3, and the equivalent circuit structure diagram is shown in figure 3; the third working mode is that energy is transmitted from the second direct current Port-2 to the first direct current Port-1, and the equivalent circuit structure diagram is shown in fig. 4; the fourth working mode is that energy is simultaneously transmitted from the first direct current Port-1 and the second direct current Port-2 to the alternating current Port-3, and the equivalent circuit structure diagram is shown in fig. 5.
In a more specific embodiment, the ninth switching tube Q1 and the tenth switching tube Q2 are thyristors. Specifically, the filter circuit 30 includes a fifth inductor L5, a sixth inductor L6, and a third capacitor C2; one end of the fifth inductor L5 is electrically connected to the tenth connection point 10, the other end of the fifth inductor L5 is electrically connected to the sixth inductor L6 to form a twelfth connection point, one end of the sixth inductor L6 is electrically connected to the input end of the ac Port-3, one end of the third capacitor C2 is electrically connected to the twelfth connection point, and the other ends of the capacitors are respectively electrically connected to the eleventh connection point and the input end of the ac Port-3.
The full-bridge inverter circuit 20 is composed of a ninth switching tube Q1, a tenth switching tube Q2, an eleventh switching tube S9 and a twelfth switching tube S10, the ninth switching tube Q1 and the tenth switching tube Q2 are arranged to be thyristors, the thyristors are adopted to replace MOS tubes in the prior art for use, and the overall production cost of the circuit is effectively reduced under the condition of ensuring the circuit performance.
In a more specific embodiment, the filter circuit 30 includes a fifth inductor L5, a sixth inductor L6, and a third capacitor C2; one end of the fifth inductor L5 is connected to the first inversion connection end of the full-bridge inverter circuit 20 as the first filtering connection end of the filtering circuit 30; the other end of the fifth inductor L5 is connected to one end of the sixth inductor L6 and one end of the second capacitor C3, and the other end of the second capacitor C3 is used as a second filtering connection end of the filtering circuit 30 to be connected to a second inversion connection end of the full-bridge inverter circuit 20; the other end of the sixth inductor L6 is used as a phase line connection end of the filter circuit 30, and the second filter connection end is used as a zero line connection end of the filter circuit 30.
Furthermore, in order to improve the filtering effect of the filtering circuit 30, the filtering circuit 30 may be configured to be composed of the fifth inductor L5, the sixth inductor L6 and the second capacitor C3, and by this configuration, the clutter in the ac output by the first inverter connection end and the second inverter connection end can be effectively filtered, so as to improve the quality of the ac output through the ac Port-3.
The three-port DC-AC converter based on the staggered Boost and the double active bridges can realize multipath direct current input under the condition of fewer devices, and can simultaneously realize the transfer of energy from a direct current side to a direct current side and from the direct current side to alternating current measurement. And the double-winding transformer T can be used for replacing the three-winding transformer T in the traditional multi-port converter, so that the overall external dimension of the circuit structure is compressed, and the problem of difficult design of the three-winding transformer T in the tight packaging under the condition of high power flow is solved.
The application discloses a three-port DC-AC converter based on staggered Boost and double active bridges, wherein the circuit comprises a transformer, a first bridge arm, a second bridge arm, a first inductor, a first capacitor, a first direct current port, a second direct current port, a third bridge arm, a fourth bridge arm, a second inductor, a second capacitor, a full-bridge inverter circuit, a filter circuit and an alternating current port; the switching signals of the two switching tubes contained in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are complementary. According to the three-port DC-AC converter, any one of the first direct current port and the second direct current port is set to input direct current, two paths of direct current input are realized under the condition that circuit devices are fewer, and the circuit structure is greatly simplified under the same application function.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any equivalent modifications or substitutions will be apparent to those skilled in the art within the scope of the present application, and these modifications or substitutions should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A three-port DC-AC converter based on interleaved Boost and dual active bridges, comprising:
a transformer comprising a first winding and a second winding, the first winding comprising a first end and a second end, the second winding comprising a third end and a fourth end;
the first bridge arm comprises a first switching tube and a second switching tube which are connected in series, and a first connection point is formed by connecting the first switching tube and the second switching tube;
the second bridge arm comprises a third switching tube and a fourth switching tube which are connected in series, a second connection point is formed between the third switching tube and the fourth switching tube, the second connection point is electrically connected with the second end of the first winding, and the second bridge arm is connected with the first bridge arm in parallel to form a third connection point and a fourth connection point;
one end of the first inductor is electrically connected with the first end of the first winding, and the other end of the first inductor is electrically connected with the first connecting point;
the two ends of the first capacitor are respectively and electrically connected with the third connecting point and the fourth connecting point;
the output end of the first direct current port is electrically connected with the third connecting point and the fourth connecting point respectively;
the output end of the second direct current port is electrically connected with the first connecting point, the second connecting point and the fourth connecting point respectively;
the third bridge arm comprises a fifth switching tube and a sixth switching tube which are connected in series, and a fifth connection point is formed by connecting the fifth switching tube and the sixth switching tube;
the fourth bridge arm comprises a seventh switching tube and an eighth switching tube which are connected in series, a sixth connection point is formed between the seventh switching tube and the eighth switching tube, the sixth connection point is electrically connected with the fourth end of the second winding, and the fourth bridge arm is connected with the fifth bridge arm in parallel to form a seventh connection point and an eighth connection point;
one end of the second inductor is electrically connected with the third end of the second winding, and the other end of the second inductor is electrically connected with the fifth connection point;
the two ends of the second capacitor are respectively and electrically connected with the seventh connection point and the eighth connection point;
the full-bridge inverter circuit comprises a fifth end, a sixth end, a seventh end and an eighth end, wherein the fifth end is electrically connected with the seventh connection point, and the sixth end is electrically connected with the eighth connection point;
the input end of the filter circuit is electrically connected with the seventh end and the eighth end respectively;
the input end of the alternating current port is electrically connected with the output end of the filter circuit;
the switching signals of the two switching tubes contained in the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are complementary.
2. The interleaved Boost and dual active bridge based three port DC-AC converter of claim 1 wherein a duty cycle of a switching signal of one of the switching tubes on at least one of the first leg, the second leg, the third leg, and the fourth leg is a preset threshold.
3. The interleaved Boost and dual active bridge based three port DC-AC converter of claim 1 or 2 wherein the duty cycle of the switching signals of the two switching tubes on each of the first, second, third, and fourth legs is a preset threshold, the preset threshold being 50%.
4. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 1 further comprising a third inductor and a fourth inductor;
one end of the third inductor is electrically connected with the first connection point, the other end of the third inductor is electrically connected with the fourth inductor to form a ninth connection point, one end of the fourth inductor is electrically connected with the second connection point, and the ninth connection point is electrically connected with the output end of the second direct current port.
5. The three-port DC-AC converter of claim 4 based on interleaved Boost and dual active bridges wherein the input of the first DC port and the input of the second DC port are each electrically connected to two PV terminals of a photovoltaic panel, and the output of the AC port is connected to a power grid.
6. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 4 wherein the input of the first DC port is electrically connected to a battery, the input of the second DC port is electrically connected to the PV end of a photovoltaic panel, and the output of the AC port is connected to a power grid; or (b)
The input end of the first direct current port is electrically connected with the PV end of the photovoltaic panel, the input end of the second direct current port is electrically connected with the battery, and the output end of the alternating current port is connected with a power grid.
7. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 1 wherein the full bridge inverter circuit comprises a fifth leg and a sixth leg, the fifth leg and the sixth leg being connected in parallel between the seventh connection point and the eighth connection point;
the fifth bridge arm comprises a ninth switching tube and a tenth switching tube which are connected in series, a tenth connection point is formed by connecting the ninth switching tube and the tenth switching tube, and the tenth connection point is electrically connected with the input end of the filter circuit;
the sixth bridge arm comprises an eleventh switching tube and a twelfth switching tube which are connected in series, an eleventh connection point is formed by connecting the eleventh switching tube and the twelfth switching tube, and the eleventh connection point is electrically connected with the input end of the filter circuit;
the switching signals of the two switching tubes contained in the fifth bridge arm and the sixth bridge arm are complementary, and the duty ratio of at least one switch in the fifth bridge arm and the sixth bridge arm is 50%.
8. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 7 wherein the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth switching transistors are any one of diodes, MOS transistors, thyristors.
9. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 8 wherein the ninth switching tube, the tenth switching tube is a thyristor.
10. The interleaved Boost and dual active bridge based three port DC-AC converter according to claim 7 wherein the filter circuit comprises a fifth inductance, a sixth inductance, and a third capacitance;
one end of the fifth inductor is electrically connected with the tenth connection point, the other end of the fifth inductor is electrically connected with the sixth inductor to form a twelfth connection point, one end of the sixth inductor is electrically connected with the input end of the alternating current port, one end of the third capacitor is electrically connected with the twelfth connection point, and the other ends of the capacitors are respectively electrically connected with the eleventh connection point and the input end of the alternating current port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117977699A (en) * | 2024-04-01 | 2024-05-03 | 厦门理工学院 | Parallel/off-grid type light storage power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117977699A (en) * | 2024-04-01 | 2024-05-03 | 厦门理工学院 | Parallel/off-grid type light storage power generation system |
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