CN114244172A - Power grid simulation power supply and use method thereof - Google Patents
Power grid simulation power supply and use method thereof Download PDFInfo
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- CN114244172A CN114244172A CN202111471153.0A CN202111471153A CN114244172A CN 114244172 A CN114244172 A CN 114244172A CN 202111471153 A CN202111471153 A CN 202111471153A CN 114244172 A CN114244172 A CN 114244172A
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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
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a power grid simulation power supply and a using method thereof, wherein the power grid simulation power supply comprises two H4 inverter bridges, a transformer T1, a transformer T2 and a contactor, the contactor comprises a normally open contact KM1, a bridge arm of one H4 inverter bridge is connected with a primary side of a transformer T1, a bridge arm of the other H4 inverter bridge is connected with a primary side of a transformer T2, one end of a secondary side of the transformer T1 is connected with one end of a normally open contact KM1, the other end of the secondary side of the transformer T1 is connected with one end of a secondary side of the transformer T2, the other end of the secondary side of the transformer T2 is connected with the other end of a normally open contact KM1, two ends of the normally open contact KM1 are respectively a first output terminal and a third output terminal, and a second output terminal is led out between the other end of the secondary side of the transformer T1 and one end of the secondary side of the transformer T2; the invention has the advantages that: different output voltage ranges are realized, and the photovoltaic inverter is suitable for the condition that various voltages exist in the output line voltage of the photovoltaic inverter.
Description
Technical Field
The invention relates to the field of test power supplies, in particular to a power grid simulation power supply and a using method thereof.
Background
At present, the output line voltage of the photovoltaic inverter has various voltages such as 380Vac, 440Vac, 690Vac, 800Vac and the like, in order to adapt to the voltage situation, a circuit is designed conventionally, different transformers need to be adjusted to cooperate and achieve aiming at different output voltage ranges, a power grid simulation power supply with different voltage gears needs to be purchased, and the output voltage of the power grid simulation power supply is various. It is necessary to design a power grid analog power supply meeting different voltage ranges aiming at the situation.
Chinese patent publication No. CN201274451 discloses a four-quadrant power grid analog power supply, which comprises a three-bridge inverter main circuit and a driving circuit, wherein the three-bridge inverter main circuit comprises three-bridge circuits at two ends, a direct current unit circuit is connected between the three-bridge circuits at the two ends, the three-bridge circuits at the two ends are respectively connected with a reactor and an isolation transformer, a lower layer control unit is connected with the three-bridge inverter main circuit, the reactor and the isolation transformer, and an upper computer control unit is a liquid crystal management unit. The method can provide signals with various types of parameters and different parameters for detecting various special functions of the grid-connected inverter, and the types of the detected inverters relate to various single-phase and three-phase inverters such as a power frequency isolation type, a non-isolation type and a high-frequency isolation type. In addition, in order to adapt to the development trend of energy conservation, the power grid analog power supply adopts four quadrants instead of the common two-phase limit, and the energy fed back by the inverter is converted into alternating current to be fed back to the power grid instead of being consumed on the power grid analog power supply. However, the application of the patent cannot realize different output voltage ranges, so that the application cannot be applied to the situation that multiple voltages exist in the output line voltage of the photovoltaic inverter.
Disclosure of Invention
The invention aims to solve the technical problem that the power grid simulation power supply in the prior art cannot realize different output voltage ranges, so that the power grid simulation power supply cannot be suitable for the condition that the output line voltage of a photovoltaic inverter has various voltages.
The invention solves the technical problems through the following technical means: a power grid simulation power supply comprises two H4 inverter bridges, a transformer T1, a transformer T2 and a contactor, wherein the contactor comprises a normally open contact KM1, the two H4 inverter bridges are both connected with a direct-current power supply Udc, a bridge arm of one H4 inverter bridge is connected with a primary side of a transformer T1, a bridge arm of the other H4 inverter bridge is connected with a primary side of the transformer T2, one end of a secondary side of a transformer T1 is connected with one end of the normally open contact KM1, the other end of the secondary side of the transformer T1 is connected with one end of the secondary side of the transformer T2, the other end of the secondary side of the transformer T2 is connected with the other end of the normally open contact KM1, two ends of the normally open contact KM1 are respectively a first output terminal and a third output terminal, and a second output terminal is led out from a connecting line between the other end of the secondary side of the transformer T1 and one end of the secondary side of the transformer T2.
The power grid simulation power supply output end is provided with the normally open contact KM1, when the normally open contact KM1 is disconnected, two H4 inverter bridges are connected in series, the first output terminal and the third output terminal are used as alternating current output ends to realize high-voltage output, when the normally open contact KM1 is closed, the two H4 inverter bridges are connected in parallel, the first output terminal and the second output terminal are used as alternating current output ends to realize low-voltage output, the design variety of power supplies is reduced, the output power density of a machine is improved, different output voltage ranges are realized, and the power grid simulation power supply is suitable for the condition that the output line voltage of a photovoltaic inverter has various voltages.
Further, the two H4 inverter bridges are defined as a first inverter bridge and a second inverter bridge, the first inverter bridge and the second inverter bridge have the same structure, the first inverter bridge comprises a transistor Q1 to a transistor Q4 which are sequentially numbered, a collector of the transistor Q1 and a collector of the transistor Q3 are both connected with the positive electrode of the dc power source Udc, an emitter of the transistor Q1 is connected with a collector of the transistor Q2, a connecting line serves as a first bridge arm, an emitter of the transistor Q3 is connected with a collector of the transistor Q4, a connecting line serves as a second bridge arm, and an emitter of the transistor Q2 and an emitter of the transistor Q4 are both connected with the negative electrode of the dc power source Udc.
Furthermore, the grid analog power supply further comprises a current transformer CT1, a first bridge arm of the first inverter bridge is connected with one end of the primary side of the transformer T1, a current transformer CT1 is arranged on a connecting line, and a second bridge arm of the first inverter bridge is connected with the other end of the primary side of the transformer T1.
Furthermore, the grid analog power supply further comprises a current transformer CT2, the first bridge arm of the second inverter bridge is connected with one end of the primary side of the transformer T2, a current transformer CT2 is arranged on a connecting line, and the second bridge arm of the second inverter bridge is connected with the other end of the primary side of the transformer T2.
Further, the grid analog power supply further comprises a capacitor C1 and a capacitor C2, the capacitor C1 is connected in parallel to two ends of the secondary side of the transformer T1, and the capacitor C2 is connected in parallel to two ends of the secondary side of the transformer T2.
Further, the grid analog power supply further comprises a current transformer CT3, and a current transformer CT3 is arranged on a current output path of the first output terminal.
Further, the power grid analog power supply is applied to a micro-power grid, an energy storage system or an inverter.
The invention also provides a using method of the power grid simulation power supply, when the normally open contact KM1 is disconnected, two H4 inverter bridges are connected in series, and the first output terminal and the third output terminal are used as alternating current output terminals to realize high-voltage output; when the normally open contact KM1 is closed, the two H4 inverter bridges are connected in parallel, and the first output terminal and the second output terminal are used as alternating current output ends, so that low-voltage output is realized.
The invention has the advantages that: the power grid simulation power supply output end is provided with the normally open contact KM1, when the normally open contact KM1 is disconnected, two H4 inverter bridges are connected in series, the first output terminal and the third output terminal are used as alternating current output ends to realize high-voltage output, when the normally open contact KM1 is closed, the two H4 inverter bridges are connected in parallel, the first output terminal and the second output terminal are used as alternating current output ends to realize low-voltage output, the design variety of power supplies is reduced, the output power density of a machine is improved, different output voltage ranges are realized, and the power grid simulation power supply is suitable for the condition that the output line voltage of a photovoltaic inverter has various voltages.
Drawings
Fig. 1 is a schematic diagram of a power grid analog power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram of parallel connection of H4 inverter bridges in a power grid analog power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power grid analog power supply according to an embodiment of the present invention, in which H4 inverter bridges are connected in series.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention provides a power grid analog power supply, which can be applied to the fields of micro-power grids, energy storage systems, inverters and the like. The power grid analog power supply comprises two H4 inverter bridges, a transformer T1, a transformer T2 and a contactor, wherein the contactor comprises a normally open contact KM1, the two H4 inverter bridges are both connected with a direct-current power supply Udc, a bridge arm of one H4 inverter bridge is connected with a primary side of a transformer T1, a bridge arm of the other H4 inverter bridge is connected with a primary side of the transformer T2, one end of a secondary side of a transformer T1 is connected with one end of the normally open contact KM1, the other end of the secondary side of the transformer T1 is connected with one end of a secondary side of the transformer T2, the other end of the secondary side of the transformer T2 is connected with the other end of the normally open contact KM1, two ends of the normally open contact KM1 are respectively a first output terminal out1 and a third output terminal out3, and a second output terminal out2 is led out from a connecting line between the other end of the secondary side of the transformer T1 and one end of a secondary side of a transformer T2.
With continued reference to fig. 1, the two H4 inverter bridges are defined as a first inverter bridge and a second inverter bridge, the first inverter bridge and the second inverter bridge have the same structure, the first inverter bridge includes a transistor Q1 to a transistor Q4 which are sequentially numbered, a collector of the transistor Q1 and a collector of the transistor Q3 are both connected to the positive electrode of the dc power source Udc, an emitter of the transistor Q1 is connected to a collector of the transistor Q2, a connecting line serves as a first bridge arm, an emitter of the transistor Q3 is connected to a collector of the transistor Q4, a connecting line serves as a second bridge arm, and an emitter of the transistor Q2 and an emitter of the transistor Q4 are both connected to the negative electrode of the dc power source Udc. The connection relationship of the second inverter bridge is shown in fig. 1, and is not described herein.
The power grid analog power supply further comprises a current transformer CT1, a current transformer CT2, a current transformer CT3, a capacitor C1 and a capacitor C2, a first bridge arm of the first inverter bridge is connected with one end of the primary side of the transformer T1, a current transformer CT1 is arranged on a connecting line, and a second bridge arm of the first inverter bridge is connected with the other end of the primary side of the transformer T1. The first bridge arm of the second inverter bridge is connected with one end of the primary side of the transformer T2, a current transformer CT2 is arranged on a connecting line, and the second bridge arm of the second inverter bridge is connected with the other end of the primary side of the transformer T2. The capacitor C1 is connected in parallel across the secondary side of the transformer T1, and the capacitor C2 is connected in parallel across the secondary side of the transformer T2. A current transformer CT3 is disposed in a current output path of the first output terminal out 1. The main circuit bus voltage Udc is used for inverting the direct current into alternating current through a bridge arm of a 2-path H4 inverter bridge and outputting the alternating current, and the inverted output voltage is isolated and transformed through a transformer T1 and a transformer T2 and is respectively connected with an alternating current capacitor C1 and a capacitor C2 for filtering and outputting. The current transformer CT1 and the current transformer CT2 sample the inverter current, and the current transformer CT3 samples the output current.
As shown in fig. 2, the normally open contact KM1 is open, the two H4 inverter bridges share a dc bus voltage, the outputs of the two H4 inverter bridges are connected in series, the first output terminal out1 and the third output terminal out3 serve as ac output terminals, and the output voltages are connected in series, thereby realizing high-voltage output.
As shown in fig. 3, the normally open contact KM1 is closed, the two H4 inverter bridges share a dc bus voltage, the two H4 inverter bridges output in parallel, the first output terminal out1 and the second output terminal out2 serve as ac output terminals, the output voltages are connected in parallel, low-voltage output is realized, and simultaneously the output power is increased by 1 time. The circuit realizes series connection and parallel connection of alternating current output voltages in a single machine, is favorable for improving the output voltage range of a power supply, does not need to purchase power grid simulation power supplies with different voltage gears for matching under the condition that the output line voltage of the photovoltaic inverter has multiple voltages, and avoids the problem that the output voltage of the power grid simulation power supply is various.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A power grid simulation power supply is characterized by comprising two H4 inverter bridges, a transformer T1, a transformer T2 and a contactor, wherein the contactor comprises a normally open contact KM1, the two H4 inverter bridges are both connected with a direct-current power supply Udc, a bridge arm of one H4 inverter bridge is connected with a primary side of a transformer T1, a bridge arm of the other H4 inverter bridge is connected with a primary side of a transformer T2, one end of a secondary side of a transformer T1 is connected with one end of the normally open contact KM1, the other end of the secondary side of the transformer T1 is connected with one end of the secondary side of the transformer T2, the other end of the secondary side of the transformer T2 is connected with the other end of the normally open contact KM1, two ends of the normally open contact KM1 are respectively a first output terminal and a third output terminal, and a second output terminal is led out from a connecting line between the other end of the secondary side of the transformer T1 and one end of the secondary side of the transformer T2.
2. A grid simulation power supply as set forth in claim 1 wherein the two H4 inverter bridges are defined as a first inverter bridge and a second inverter bridge, the first inverter bridge and the second inverter bridge are identical in structure, the first inverter bridge comprises a sequentially numbered transistor Q1 to transistor Q4, a collector of the transistor Q1 and a collector of the transistor Q3 are both connected to the positive pole of the dc power source Udc, an emitter of the transistor Q1 is connected to a collector of the transistor Q2, the connecting line serves as a first leg, an emitter of the transistor Q3 is connected to a collector of the transistor Q4, the connecting line serves as a second leg, and an emitter of the transistor Q2 and an emitter of the transistor Q4 are both connected to the negative pole of the dc power source Udc.
3. A grid analog power supply according to claim 2, characterized by further comprising a current transformer CT1, wherein the first leg of the first inverter bridge is connected to one end of the primary side of the transformer T1 and the current transformer CT1 is provided on the connection line, and the second leg of the first inverter bridge is connected to the other end of the primary side of the transformer T1.
4. A grid analog power supply according to claim 2, characterized by further comprising a current transformer CT2, wherein the first leg of the second inverter bridge is connected to one end of the primary side of the transformer T2 and the current transformer CT2 is provided on the connection line, and the second leg of the second inverter bridge is connected to the other end of the primary side of the transformer T2.
5. A grid simulation power supply according to claim 1, further comprising a capacitor C1 and a capacitor C2, wherein the capacitor C1 is connected in parallel across the secondary side of the transformer T1, and the capacitor C2 is connected in parallel across the secondary side of the transformer T2.
6. A grid analogue power supply according to claim 1, further comprising a current transformer CT3, wherein a current transformer CT3 is provided in the current output path of the first output terminal.
7. A grid simulating power supply according to any of claims 1 to 6 for use in micro-grids, energy storage systems or inverters.
8. A use method of a power grid simulation power supply according to any one of claims 1 to 6, wherein when the normally open contact KM1 is opened, two H4 inverter bridges are connected in series, and the first output terminal and the third output terminal are used as AC output terminals to realize high voltage output; when the normally open contact KM1 is closed, the two H4 inverter bridges are connected in parallel, and the first output terminal and the second output terminal are used as alternating current output ends, so that low-voltage output is realized.
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| CN114244172B CN114244172B (en) | 2023-06-20 |
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2021
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