CN111641346A - Multifunctional standard converter and control method - Google Patents
Multifunctional standard converter and control method Download PDFInfo
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- CN111641346A CN111641346A CN202010556967.3A CN202010556967A CN111641346A CN 111641346 A CN111641346 A CN 111641346A CN 202010556967 A CN202010556967 A CN 202010556967A CN 111641346 A CN111641346 A CN 111641346A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 238000004146 energy storage Methods 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 238000001914 filtration Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
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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
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- Inverter Devices (AREA)
Abstract
The invention discloses a multifunctional standard converter and a control method, comprising the following steps: the direct current side energy storage part, the IGBT conversion part, the relay part and the filtering part; two ends of a first switch in the relay part are respectively connected with the midpoint of the direct-current side energy storage part and the N line, two ends of a second switch are respectively connected with the negative electrode of the direct-current end and the N line, two ends of a third switch are respectively connected with the phase B and the phase C, and two ends of a fourth switch are respectively connected with the phase B and the phase A; a first inductor in the filtering part is connected to the phase A, a second inductor is connected to the phase B, and a third inductor is connected to the phase C; two ends of the first capacitor are respectively connected with the phase C and the line N, the second capacitor is respectively connected with the phase B and the line N, and the third capacitor is respectively connected with the phase A and the line N. The invention can form AC/DC conversion or DC/DC conversion topology, realizes AC-DC or DC-AC electric quantity conversion, and has the characteristics of multiple function conversion and one machine with multiple functions.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a multifunctional standard converter and a control method.
Background
In recent years, new energy sources such as wind power generation, photovoltaic power generation, new energy vehicles and the like are rapidly developed, distributed energy sources are connected into a power grid, so that a traditional alternating current power grid is impacted, alternating current or direct current-based micro-power grids are increasingly researched and applied no matter on a high-voltage power transmission side or a low-voltage power distribution side, and become a development trend of a future energy management form, and the connection and storage of various energy sources such as photovoltaic power generation, wind power generation, lithium battery energy storage, fuel battery energy storage and the like can be involved in the construction of the micro-power grids. The interconnection of these energy sources is not independent of the various AC-DC, DC-AC converter devices. The traditional AC-DC converter adopts a single main power topological structure, generally adopts three-phase half-bridge and output filtering, and the controller only realizes the control mode of alternating current grid connection to complete the conversion from alternating current to direct current. The traditional DC-AC converter adopts a single main power topological structure, generally adopts three-phase half-bridge and output filtering, and the controller only realizes the control mode of AC inversion to complete the conversion from DC to AC. The traditional DC-DC converter adopts a single main power topological structure, generally adopts single-phase half-bridge plus output filtering, and the controller only adopts a control mode of Buck voltage reduction or Boost voltage reduction to complete the conversion from direct current to direct current. However, the traditional AC-DC, DC-DC and DC-AC converters need different customized converters according to different application scenarios, especially the application scenario that multiple converters are coordinated and matched, which cannot satisfy multiple purposes of one machine, and the application range is limited.
Disclosure of Invention
The invention aims to provide a multifunctional standard converter and a control method. The invention can form AC/DC conversion or DC/DC conversion topology, realizes AC-DC or DC-AC electric quantity conversion, and has the characteristics of multiple function conversion and one machine with multiple functions.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a multifunctional standard converter comprising:
the direct current side energy storage part comprises a fourth capacitor and a fifth capacitor which are connected between direct current ends;
the IGBT conversion part is in a three-phase half-bridge topology and is connected with an A phase, a B phase and a C phase;
the relay part comprises a first switch, a second switch, a third switch and a fourth switch, wherein two ends of the first switch are respectively connected with the midpoint of the direct-current side energy storage part and the N line, two ends of the second switch are respectively connected with the cathode of the direct-current end and the N line, two ends of the third switch are respectively connected with the phase B and the phase C, and two ends of the fourth switch are respectively connected with the phase B and the phase A;
the filter part comprises a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor and a third capacitor, wherein the first inductor is connected to the phase A, the second inductor is connected to the phase B, and the third inductor is connected to the phase C; the two ends of the first capacitor are respectively connected with the phase C and the line N, the second capacitor is respectively connected with the phase B and the line N, and the third capacitor is respectively connected with the phase A and the line N.
In the multifunctional standard converter, the IGBT conversion part is a two-level three-phase half-bridge topology, an NPCI three-phase half-bridge topology or a T-type three-phase half-bridge topology.
In the multifunctional standard converter, the IGBT conversion part has a two-level three-phase half-bridge topology, and comprises three single-phase half-bridge inverter circuits connected in parallel; the first single-phase half-bridge inverter circuit consists of a first power switch tube and a second power switch tube, the second single-phase half-bridge inverter circuit consists of a third power switch tube and a fourth power switch tube, and the third single-phase half-bridge inverter circuit consists of a fifth power switch tube and a sixth power switch tube; a phase A is connected between the first power switch tube and the second power switch tube, a phase B is connected between the third power switch tube and the fourth power switch tube, and a phase C is connected between the fifth power switch tube and the sixth power switch tube.
According to the control method of the multifunctional standard converter, the controller unit collects electric quantity of a direct current end, collects electric quantity of alternating current/direct current ends at the A phase, the B phase and the C phase, then controls the opening and closing of the relay part according to the mode selection instruction to form corresponding alternating current conversion or direct current conversion topology, meanwhile, the controller unit selects a corresponding control algorithm, and generates a control signal through the PWM generator to control the IGBT conversion part to complete function conversion of the converter.
According to the control method of the multifunctional standard converter, the first switch of the relay is closed, the second switch of the relay is opened, the third switch of the relay is opened, and the fourth switch of the relay is opened, so that a direct/alternating conversion main power topology is formed, and AC-DC or DC-AC conversion is realized, so that the control method is used for realizing alternating current grid connection control, wind power generation control, alternating current inversion control and reactive compensation control.
According to the control method of the multifunctional standard converter, the first switch of the relay is switched off, the second switch is switched on, the third switch is switched on, and the fourth switch is switched on, so that a direct/direct conversion main power topology is formed, the DC-DC conversion is realized, and the control method is used for realizing a photovoltaic power generation control mode, a lithium battery management control mode and a fuel cell management control mode.
Compared with the prior art, the invention is composed of a direct current side energy storage part, an IGBT conversion part filtering part and a relay part, and can realize the switching of a direct current/alternating conversion main power topology and a direct current/direct conversion main power topology through the switch control of the relay part K1-K4, and complete AC-DC or DC-AC conversion or DC-DC conversion, thereby realizing multiple function conversion, greatly expanding the application range of the converter and achieving the purpose of one machine with multiple purposes.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the control method.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example (b): a multifunctional standard converter, as shown in fig. 1, comprising:
a direct current side energy storage section comprising a fourth capacitor C4 and a fifth capacitor C5 connected between the direct current terminals (DC + _1, DC- _ 1);
the IGBT conversion part is a two-level three-phase half-bridge topology in the embodiment and comprises three single-phase half-bridge inverter circuits connected in parallel; the first single-phase half-bridge inverter circuit consists of a first power switch tube T1 and a second power switch tube T2, the second single-phase half-bridge inverter circuit consists of a third power switch tube T3 and a fourth power switch tube T4, and the third single-phase half-bridge inverter circuit consists of a fifth power switch tube T5 and a sixth power switch tube T6; the A phase is connected between the first power switch tube T1 and the second power switch tube T2, the B phase is connected between the third power switch tube T3 and the fourth power switch tube T4, and the C phase is connected between the fifth power switch tube T5 and the sixth power switch tube T6; the output terminals of the direct current end are DC + _1 and DC- _1, and the alternating current output terminals of the alternating current/direct current end are A (DC + _ 2) and N (DC- _ 2);
the relay part comprises a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, wherein two ends of the first switch K1 are respectively connected with a midpoint O and an N line of the direct-current side energy storage part, two ends of the second switch K2 are respectively connected with a negative pole and an N line of a direct-current end, two ends of the third switch K3 are respectively connected with a phase B and a phase C, and two ends of the fourth switch K4 are respectively connected with a phase B and a phase A;
the filter part comprises a first inductor L1, a second inductor L2, a third inductor L3, a first capacitor C1, a second capacitor C2 and a third capacitor C3, wherein the first inductor is connected to the phase A, the second inductor L2 is connected to the phase B, and the third inductor is connected to the phase C; two ends of the first capacitor C1 are respectively connected with a phase C and an N line, the second capacitor C2 is respectively connected with a phase B and an N line, and the third capacitor C3 is respectively connected with a phase A and an N line;
in use, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 of the relay are closed, so that a direct/alternating conversion main power topology is formed, and AC-DC or DC-AC conversion is realized; a first switch K1 of the relay is opened, a second switch K2 is closed, a third switch K3 is closed, and a fourth switch K4 is closed, so that a direct/direct conversion main power topology is formed, and DC-DC conversion is realized.
Example 2: a control method of a multifunctional standard converter is disclosed, as shown in figure 2, a controller unit collects electric quantity (VDC _1, IDC _ 1) of a direct current end, collects electric quantity (Va, Vb, Vc, Ia, Ib and Ic) of an alternating current/direct current end at an A phase, a B phase and a C phase, then according to a mode selection instruction, the controller unit controls the opening and closing of a corresponding relay part to form a corresponding alternating current conversion or direct current conversion topology, specifically, for example, a first switch (K1) of the relay is closed, a second switch (K2) is opened, a third switch (K3) is opened, and a fourth switch (K4) is opened to form a direct/alternating current conversion main power topology, so that AC-DC or DC-AC conversion is realized, and the control of alternating current grid connection, wind power generation, alternating current inversion and reactive compensation is realized; for example, a first switch (K1), a second switch (K2), a third switch (K3) and a fourth switch (K4) of a relay are opened, so that a direct/direct conversion main power topology is formed, and DC-DC conversion is realized, and the direct/direct conversion main power topology is used for realizing a photovoltaic power generation control mode, a lithium battery management control mode and fuel cell management control; after the corresponding alternating current conversion or direct current conversion topology is formed, the controller unit selects the corresponding control algorithm, and generates a control signal through the PWM generator to control the IGBT conversion part, so that the function conversion of the converter is completed.
In summary, the switching between the direct current/alternating conversion main power topology and the direct current/direct conversion main power topology can be realized through the switching control of the relay part K1-K4, and the AC-DC or DC-AC conversion or DC-DC conversion is completed, so that the conversion of multiple functions can be realized, the application range of the converter is greatly expanded, and the aim of one machine with multiple functions is fulfilled.
Claims (6)
1. A multifunctional standard converter is characterized in that: the method comprises the following steps:
a DC-side energy storage section including a fourth capacitor (C4) and a fifth capacitor (C5) connected between DC terminals;
the IGBT conversion part is in a three-phase half-bridge topology and is connected with an A phase, a B phase and a C phase;
the relay part comprises a first switch (K1), a second switch (K2), a third switch (K3) and a fourth switch (K4), wherein two ends of the first switch (K1) are respectively connected with a midpoint (O) and an N line of the energy storage part on the direct current side, two ends of the second switch (K2) are respectively connected with a negative electrode of the direct current side and the N line, two ends of the third switch (K3) are respectively connected with a phase B and a phase C, and two ends of the fourth switch (K4) are respectively connected with a phase B and a phase A;
a filter part including a first inductor (L1), a second inductor (L2), a third inductor (L3), a first capacitor (C1), a second capacitor (C2), and a third capacitor (C3), the first inductor being connected to the a phase, the second inductor (L2) being connected to the B phase, and the third inductor being connected to the C phase; two ends of the first capacitor (C1) are respectively connected with the C phase and the N line, the second capacitor (C2) is respectively connected with the B phase and the N line, and the third capacitor (C3) is respectively connected with the A phase and the N line.
2. The multifunctional standard converter according to claim 1, wherein: the IGBT conversion part is a two-level three-phase half-bridge topology, an NPCI three-phase half-bridge topology or a T-type three-phase half-bridge topology.
3. The multifunctional standard converter according to claim 2, wherein: the IGBT conversion part comprises three single-phase half-bridge inverter circuits connected in parallel; the first single-phase half-bridge inverter circuit is composed of a first power switch tube (T1) and a second power switch tube (T2), the second single-phase half-bridge inverter circuit is composed of a third power switch tube (T3) and a fourth power switch tube (T4), and the third single-phase half-bridge inverter circuit is composed of a fifth power switch tube (T5) and a sixth power switch tube (T6); a phase is connected between the first power switch tube (T1) and the second power switch tube (T2), B phase is connected between the third power switch tube (T3) and the fourth power switch tube (T4), and C phase is connected between the fifth power switch tube (T5) and the sixth power switch tube (T6).
4. A control method of a multifunctional standard converter according to any of claims 1 to 3, characterized in that: the controller unit collects electric quantity of a direct current end, collects alternating/direct current end electric quantity of the A phase, the B phase and the C phase, then controls the opening and closing of the relay part according to a mode selection instruction to form a corresponding alternating current conversion or direct current conversion topology, meanwhile, the controller unit selects a corresponding control algorithm, and generates a control signal through the PWM generator to control the IGBT conversion part to complete function conversion of the converter.
5. The control method of the multifunctional standard converter according to claim 4, wherein: a first switch (K1) of the relay is closed, a second switch (K2) is opened, a third switch (K3) is opened, and a fourth switch (K4) is opened, so that a direct/alternating conversion main power topology is formed, AC-DC or DC-AC conversion is realized, and the direct/alternating conversion main power topology is used for realizing alternating current grid connection control, wind power generation control, alternating current inversion control and reactive compensation control.
6. The control method of the multifunctional standard converter according to claim 4, wherein: a first switch (K1) of the relay is opened, a second switch (K2) is closed, a third switch (K3) is closed, a fourth switch (K4) is closed, a direct/direct conversion main power topology is formed, and DC-DC conversion is achieved and is used for achieving a photovoltaic power generation control mode, a lithium battery management control mode and fuel cell management control.
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| CN202010556967.3A CN111641346A (en) | 2020-06-18 | 2020-06-18 | Multifunctional standard converter and control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272097A (en) * | 2008-05-12 | 2008-09-24 | 浙江大学 | Multifunctional structure-changing type DC convertor |
| US20100244775A1 (en) * | 2009-03-25 | 2010-09-30 | Smith Lynn B | Bidirectional energy converter |
| CN108494229A (en) * | 2018-06-01 | 2018-09-04 | 上海寰晟电力能源科技有限公司 | A kind of AC/DC universal type Electric power route deivce topology and its control method |
| CN109075713A (en) * | 2016-03-15 | 2018-12-21 | Abb瑞士股份有限公司 | Bi-directional DC-DC current transformer and its control method |
| CN109194179A (en) * | 2018-10-24 | 2019-01-11 | 浙江科技学院 | Great power bidirectional AC/DC integrated power supply device |
-
2020
- 2020-06-18 CN CN202010556967.3A patent/CN111641346A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272097A (en) * | 2008-05-12 | 2008-09-24 | 浙江大学 | Multifunctional structure-changing type DC convertor |
| US20100244775A1 (en) * | 2009-03-25 | 2010-09-30 | Smith Lynn B | Bidirectional energy converter |
| CN109075713A (en) * | 2016-03-15 | 2018-12-21 | Abb瑞士股份有限公司 | Bi-directional DC-DC current transformer and its control method |
| CN108494229A (en) * | 2018-06-01 | 2018-09-04 | 上海寰晟电力能源科技有限公司 | A kind of AC/DC universal type Electric power route deivce topology and its control method |
| CN109194179A (en) * | 2018-10-24 | 2019-01-11 | 浙江科技学院 | Great power bidirectional AC/DC integrated power supply device |
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