CN218997705U - Three-level wind-storage integrated direct-current side energy storage circuit topology - Google Patents
Three-level wind-storage integrated direct-current side energy storage circuit topology Download PDFInfo
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- CN218997705U CN218997705U CN202223112560.5U CN202223112560U CN218997705U CN 218997705 U CN218997705 U CN 218997705U CN 202223112560 U CN202223112560 U CN 202223112560U CN 218997705 U CN218997705 U CN 218997705U
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Abstract
The utility model discloses a three-level wind-storage integrated direct-current side energy storage circuit topology which comprises a converter assembly, a DCDC assembly and an energy storage assembly, wherein the converter assembly comprises a circuit breaker, a grid-connected contactor, a grid-side converter and a machine side converter; the rear end of the circuit breaker is connected with the generator stator through the grid-connected contactor, and the rear end of the circuit breaker is connected with the grid-side converter; the network side converter is connected with the machine side converter through positive and negative buses of the converter; the DCDC component comprises a DCDC positive bus and a DCDC negative bus and N power loops; the DCDC positive and negative buses are connected with the positive and negative buses of the converter; the circuit topology is a single-stage three-level DCDC circuit topology, isolation topology is not adopted, the requirements of primary frequency modulation and inertia response of the wind turbine can be met, the power density of the wind storage integrated machine can be improved, the power adaptability is enhanced, the system cost of the whole machine is reduced, the system devices are simple, and the stable operation capability of the system is improved.
Description
Technical Field
The utility model relates to the technical field of wind power and energy storage, in particular to a three-level wind-storage integrated direct current side energy storage circuit topology.
Background
In the prior art, a wind-storage integrated direct current side energy storage circuit topology mostly adopts a converter network side, a two-stage buck-boost topology or a converter network side and an isolated two-stage buck-boost topology, and Chinese patent No. 213846557U discloses an energy storage converter which comprises an AC/DC conversion module and a DC/DC conversion module, wherein an alternating current side of the AC/DC conversion module is connected with an alternating current power grid through a filter so that a high-voltage side and a low-voltage side of the energy storage converter are isolated, and an LCL filter is additionally arranged on an alternating current side of the AC/DC converter, and a battery module is connected to a load part of each flyback converter.
The topology adopts the converter network side and the isolation type two-stage buck-boost, which causes complex control, high failure rate, various devices, low power density, small voltage application range and poor power expansion capability.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a three-level wind storage integrated direct current side energy storage circuit topology which is a single-stage three-level DCDC circuit topology, and an isolation topology is not adopted, so that the requirements of primary frequency modulation and inertia response of a wind turbine generator can be met, the power density of the wind storage integrated machine can be improved, the power adaptability can be enhanced, the system cost of the whole machine can be reduced, the system devices are simple, and the stable operation capability of the system can be improved.
In order to solve the technical problems, the utility model provides a three-level wind-storage integrated direct-current side energy storage circuit topology which comprises a converter component, a DCDC component and an energy storage component, wherein the converter component comprises a circuit breaker, a grid-connected contactor, a grid-side converter and a machine side converter; the rear end of the circuit breaker is connected with the generator stator side through the grid-connected contactor, and the rear end of the circuit breaker is connected with the grid-side converter; the grid-side converter is connected with the machine-side converter through positive and negative buses of the converter, and the machine-side converter is connected with the rotor side of the generator; the DCDC component comprises a DCDC positive bus and a DCDC negative bus and N power loops; the DCDC positive and negative buses are connected with the positive and negative buses of the converter; the output ends of the N power loops are connected with the energy storage component, wherein N is more than or equal to 1.
Preferably, the converter assembly further comprises a first fuse FU1, and the rear end of the circuit breaker is connected to the grid-side converter through the first fuse FU 1.
Preferably, the three-level wind storage integrated direct current side energy storage circuit topology further comprises a filter capacitor, wherein the filter capacitor is arranged between the rear end of the grid-connected contactor and a connecting line of the generator or between the rear end of the main circuit breaker and a connecting line of the grid-side converter.
Preferably, the converter assembly further comprises a converter soft start unit, two phases of the circuit breaker are connected with the converter soft start unit, and the converter soft start unit is connected with the grid-side converter to charge positive and negative buses of the converter through the grid-side converter; or the converter soft start unit is connected with a 380V auxiliary power supply, and the converter soft start unit is connected with the positive and negative buses of the converter to directly charge the positive and negative buses of the converter.
Preferably, the DCDC component further includes a DCDC soft start unit, a filter inductor L1 and a filter inductor L2, each power loop includes four IGBT power devices connected in series, each power loop is connected in parallel, a P end, an O end and an N end of each power loop are respectively connected with a P end, an O end and an N end of the DCDC positive and negative bus, the DCDC positive and negative bus is connected with the positive and negative bus of the converter through the DCDC soft start unit, and an upper half-bridge ac output end and a lower half-bridge ac output end of each power loop are respectively connected with the filter inductor L1 and the filter inductor L2.
Preferably, the DCDC component further includes a filter capacitor Cs and a capacitor soft start unit, the filter inductor L1 is connected with one end of the filter capacitor Cs, the other end of the filter capacitor Cs is connected with the filter inductor L2, the filter inductor L1 is connected with one end of the capacitor soft start unit, the other end of the capacitor soft start unit is connected with the energy storage component, and the other end of the filter inductor L2 is connected with the energy storage component.
After the structure is adopted, the three-level wind-storage integrated direct-current side energy storage circuit topology comprises a converter component, a DCDC component and an energy storage component, wherein the converter component comprises a circuit breaker, a grid-connected contactor, a grid-side converter and a machine-side converter; the rear end of the circuit breaker is connected with the generator stator through the grid-connected contactor, and the rear end of the circuit breaker is connected with the grid-side converter; the network side converter is connected with the machine side converter through positive and negative buses of the converter; the DCDC component comprises a DCDC positive bus and a DCDC negative bus and N power loops; the DCDC positive and negative buses are connected with the positive and negative buses of the converter; the output ends of the N power loops are connected with the energy storage component, wherein N is more than or equal to 1; the three-level wind storage integrated direct current side energy storage circuit topology is a single-stage three-level DCDC circuit topology, and isolation topology is not adopted, so that the requirements of primary frequency modulation and inertia response of a wind turbine generator can be met, the power density of the wind storage integrated machine can be improved, the power adaptability is enhanced, the system cost of the whole machine is reduced, the system devices are simple, and the stable operation capability of the system is improved.
Drawings
FIG. 1 is a circuit diagram of a prior art wind-powered integrated DC side tank circuit topology;
FIG. 2 is a schematic diagram of a three-level wind-powered integrated DC side tank circuit topology according to the present utility model;
FIG. 3 is a second overall circuit diagram of a three-level wind-powered integrated DC side tank circuit topology of the present utility model;
FIG. 4 is a three-level wind-powered integrated DC side tank circuit topology of the present utility model;
fig. 5 is a fourth overall circuit diagram of the three-level wind-storage integrated dc side tank circuit topology of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
Referring to fig. 2 and 3, fig. 2 is a first overall circuit diagram of a three-level wind-storage integrated dc side tank circuit topology according to the present utility model, and fig. 3 is a second overall circuit diagram of a three-level wind-storage integrated dc side tank circuit topology according to the present utility model;
the embodiment discloses a three-level wind-storage integrated direct-current side energy storage circuit topology, which comprises a converter assembly, a DCDC assembly and an energy storage assembly, wherein the converter assembly comprises a circuit breaker, a grid-connected contactor, a grid-side converter and a machine-side converter; the rear end of the circuit breaker is connected with the generator stator side through the grid-connected contactor, and the rear end of the circuit breaker is connected with the grid-side converter; the grid-side converter is connected with the machine-side converter through positive and negative buses of the converter, and the machine-side converter is connected with the rotor side of the generator; the DCDC component comprises a DCDC positive bus and a DCDC negative bus and N power loops; the DCDC positive and negative buses are connected with the positive and negative buses of the converter; the output ends of the N power loops are connected with the energy storage component, wherein N is more than or equal to 1.
Example two
In this embodiment, the converter assembly further includes a first fuse FU1, and the rear end of the circuit breaker is connected to the grid-side converter through the first fuse FU 1.
The three-level wind storage integrated direct-current side energy storage circuit topology also comprises a filter capacitor; as shown in fig. 4, the filter capacitor is arranged between the rear end of the grid-connected contactor and the connection line of the generator; or as shown in fig. 5, the filter capacitor is arranged between the rear end of the main breaker and the network side converter connection line.
The converter assembly further comprises a converter soft start unit, as shown in fig. 4, two phases of the circuit breaker are connected with the converter soft start unit, and the converter soft start unit is connected with the grid-side converter to charge positive and negative buses of the converter through the grid-side converter; or as shown in fig. 5, the converter soft start unit is connected with a 380V auxiliary power supply, and then is connected with the positive bus and the negative bus of the converter to directly charge the positive bus and the negative bus of the converter.
The DCDC component further comprises a DCDC soft start unit, a filter inductor L1 and a filter inductor L2, each power loop comprises four IGBT power devices which are connected in series, each power loop is connected in parallel, the P end, the O end and the N end of each power loop are respectively connected with the P end, the O end and the N end of the DCDC positive bus and the P end of the DCDC negative bus, the DCDC positive bus and the DCDC negative bus are connected with the current transformer through the DCDC soft start unit, and the upper half-bridge alternating current output end and the lower half-bridge alternating current output end of each power loop are respectively connected with the filter inductor L1 and the filter inductor L2.
The DCDC component further comprises a filter capacitor Cs and a capacitor soft start unit, wherein the filter inductor L1 is connected with one end of the filter capacitor Cs, the other end of the filter capacitor Cs is connected with the filter inductor L2, the filter inductor L1 is connected with one end of the capacitor soft start unit, the other end of the capacitor soft start unit is connected with the energy storage component, and the other end of the filter inductor L2 is connected with the energy storage component.
The three-level wind storage integrated direct current side energy storage circuit topology is a single-stage three-level DCDC circuit topology, and isolation topology is not adopted, so that the requirements of primary frequency modulation and inertia response of a wind turbine generator can be met, the power density of the wind storage integrated machine can be improved, the power adaptability is enhanced, the system cost of the whole machine is reduced, the system devices are simple, and the stable operation capability of the system is improved.
It should be understood that the foregoing is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and all equivalent structures or equivalent processes using the descriptions of the present utility model and the accompanying drawings, or direct or indirect application in other relevant technical fields, are included in the scope of the present utility model.
Claims (6)
1. The three-level wind-storage integrated direct-current side energy storage circuit topology is characterized by comprising a converter assembly, a DCDC assembly and an energy storage assembly, wherein the converter assembly comprises a circuit breaker, a grid-connected contactor, a grid-side converter and a machine-side converter; the rear end of the circuit breaker is connected with the generator stator side through the grid-connected contactor, and the rear end of the circuit breaker is connected with the grid-side converter; the grid-side converter is connected with the machine-side converter through positive and negative buses of the converter, and the machine-side converter is connected with the rotor side of the generator; the DCDC component comprises a DCDC positive bus and a DCDC negative bus and N power loops; the DCDC positive and negative buses are connected with the positive and negative buses of the converter; the output ends of the N power loops are connected with the energy storage component, wherein N is more than or equal to 1.
2. The three-level wind power storage integrated direct current side tank circuit topology of claim 1, wherein the converter assembly further comprises a first fuse FU1, and the circuit breaker back end is connected to the grid side converter through the first fuse FU 1.
3. The three-level wind-storage integrated direct-current side tank circuit topology according to claim 1, further comprising a filter capacitor, wherein the filter capacitor is arranged between a connection line of the grid-connected contactor rear end and the generator or between a main circuit breaker rear end and the grid-side converter connection line.
4. The three-level wind-storage integrated direct-current side energy storage circuit topology according to claim 2, wherein the converter assembly further comprises a converter soft start unit, two phases of the circuit breaker are connected with the converter soft start unit, and the converter soft start unit is connected with the grid-side converter to charge positive and negative buses of the converter through the grid-side converter; or the converter soft start unit is connected with a 380V auxiliary power supply, and the converter soft start unit is connected with the positive and negative buses of the converter to directly charge the positive and negative buses of the converter.
5. The three-level wind-storage integrated direct-current side energy storage circuit topology according to claim 2, wherein the DCDC component further comprises a DCDC soft start unit, a filter inductor L1 and a filter inductor L2, each power loop comprises four series-connected IGBT power devices, each power loop is connected in parallel, a P end, an O end and an N end of each power loop are respectively connected with a P end, an O end and an N end of the DCDC positive and negative bus, the DCDC positive and negative bus is connected with the positive and negative bus of the converter through the DCDC soft start unit, and an upper half-bridge alternating-current output end and a lower half-bridge alternating-current output end of each power loop are respectively connected with the filter inductor L1 and the filter inductor L2.
6. The three-level wind-storage integrated direct-current side energy storage circuit topology according to claim 5, wherein the DCDC component further comprises a filter capacitor Cs and a capacitor soft start unit, the filter inductor L1 is connected with one end of the filter capacitor Cs, the other end of the filter capacitor Cs is connected with the filter inductor L2, the filter inductor L1 is connected with one end of the capacitor soft start unit, the other end of the capacitor soft start unit is connected with the energy storage component, and the other end of the filter inductor L2 is connected with the energy storage component.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223112560.5U CN218997705U (en) | 2022-11-21 | 2022-11-21 | Three-level wind-storage integrated direct-current side energy storage circuit topology |
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| CN202223112560.5U CN218997705U (en) | 2022-11-21 | 2022-11-21 | Three-level wind-storage integrated direct-current side energy storage circuit topology |
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