CN210007623U - Power conversion system - Google Patents
Power conversion system Download PDFInfo
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- CN210007623U CN210007623U CN201921035503.7U CN201921035503U CN210007623U CN 210007623 U CN210007623 U CN 210007623U CN 201921035503 U CN201921035503 U CN 201921035503U CN 210007623 U CN210007623 U CN 210007623U
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Abstract
The utility model provides an power conversion system, including the main power unit, contain a plurality of power conversion modules, wherein each the input series connection of power conversion module, and auxiliary power supply, set up outside the main power unit, 0 auxiliary power supply contains the auxiliary power supply unit at least, auxiliary power supply unit at least with power conversion module electric connection and for its auxiliary power supply, wherein, every the auxiliary power supply unit receives the voltage that external power supply provided to export the second voltage to the power conversion module that corresponds.
Description
Technical Field
The utility model relates to an kinds of power conversion system, especially relate to kinds of power conversion system that have auxiliary power source.
Background
With the progress of a distributed power generation technology and the increasing of direct-current power utilization equipment, the demand for low-voltage direct-current power distribution is increased day by day, and a traditional low-voltage direct-current power distribution mode adopting a power frequency isolation transformer has the defects of high power transmission cost, large loss, high light load loss, large volume and weight and the like, and becomes a main obstacle for realizing a high-power density and high-efficiency smart grid.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to provide power conversion systems, and the auxiliary power supply can meet the auxiliary power supply requirement of the power conversion system.
In order to achieve the above object, the present invention provides power conversion systems, which includes a main power unit including a plurality of power conversion modules, wherein inputs of the power conversion modules are connected in series, and a -th auxiliary power supply disposed outside the main power unit, wherein the 0-th auxiliary power supply includes at least 1-th 2-th -th auxiliary power supply unit, and the 3-th auxiliary power supply unit is electrically connected with and supplies power to at least power conversion modules, wherein each of the -th auxiliary power supply units receives a -th voltage supplied from an -th external power supply and outputs the second voltage to the corresponding power conversion module, and each of the -th auxiliary power supply units is provided with a plurality of output ports, wherein at least a output port is electrically connected to the corresponding power conversion module.
In the embodiment of the present invention, the th auxiliary power supply includes a plurality of th auxiliary power supply units corresponding to and supplying auxiliary power to the plurality of power conversion modules .
In the embodiment of the present invention, the th auxiliary power supply unit is provided with a plurality of output ports, and the plurality of output ports are respectively connected to different power conversion modules and provide auxiliary power thereto.
In the exemplary embodiment of the present invention, each of the power conversion modules comprises a th sub-module, a second sub-module and a transformer, wherein the th sub-module is electrically connected to a th side winding of the transformer, the second sub-module is electrically connected to a secondary side winding of the transformer, and the th sub-modules of the plurality of power conversion modules are connected in series at their inputs.
In the embodiment of the present invention, the th auxiliary power supply unit is electrically connected to the th sub-module and supplies power to the sub-module.
In the embodiment of the present invention, the power conversion system further comprises a second auxiliary power supply disposed outside the plurality of power conversion modules, wherein an input terminal of the second auxiliary power supply is electrically connected to a second external power supply, and an output terminal of the second auxiliary power supply is electrically connected to every of the second sub-modules of the power conversion modules for auxiliary power supply.
In the embodiment of the present invention, the second auxiliary power supply comprises a plurality of second auxiliary power supply units electrically connected to the second sub-module of the power conversion module, wherein each the second auxiliary power supply unit receives the third voltage provided by the second external power supply and outputs the fourth voltage to the corresponding second sub-module of the power conversion module.
In an embodiment of the present invention, each of the power conversion modules further comprises a control unit for controlling the sub-module of the corresponding power conversion module, wherein each of the -th auxiliary power supply unit has a -th output port, and the -th output port is electrically connected to the control unit of the corresponding power conversion module.
In the exemplary embodiment of the present invention, each the power conversion module further includes an auxiliary circuit, the auxiliary circuit is electrically connected to the th sub-module of the power conversion module, wherein each the th auxiliary power supply unit has a second output port, and the second output port is electrically connected to the auxiliary circuit of the power conversion module.
In the embodiment of the present invention, the auxiliary circuit is a charging and discharging circuit, and the auxiliary circuit is controlled by the control unit.
In the embodiment of the present invention, the power conversion system further includes a plurality of bypass units disposed outside the plurality of power conversion modules, the plurality of bypass units corresponding to the plurality of power conversion modules and corresponding sub-modules of the power conversion modules are connected in parallel, wherein, every the th auxiliary power unit has a third output port electrically connected to the corresponding bypass unit.
In the embodiment of the present invention, the second external power source and the th external power source are the same as the external power source, and the input terminal of the th auxiliary power source and the input terminal of the second auxiliary power source are connected in parallel to the external power source.
In the embodiment of the present invention, the th auxiliary power supply unit is an isolated converter circuit.
In the embodiment of the present invention, the th auxiliary power supply unit is an LLC-DCX circuit.
In the embodiment of the present invention, the power conversion system comprises a plurality of main power units, each main power unit comprises a plurality of power conversion modules, wherein the input ends of the power conversion modules of each main power unit are connected in series, and each th auxiliary power unit is electrically connected to the power conversion module corresponding to each main power unit to supply power for the auxiliary power unit respectively in each th time.
In the embodiment of the present invention, the outputs of the power conversion modules in the main power unit of each phase are connected in parallel.
In the embodiment of the present invention, the outputs of the multi-phase main power units are connected in parallel.
The utility model discloses a power conversion system's auxiliary power supply can be fine satisfies power conversion system's auxiliary power supply requirement, and auxiliary power supply's power supply mode is provided by external power source, need not the input in main power return circuit, can realize system debugging, software updating, especially after the main power return circuit tripping operation falls the electricity for reasons, can ensure that the auxiliary power supply of system is incessant, improves security, the reliability of system.
The utility model discloses a power conversion system's auxiliary power supply sets up outside power conversion module, both mutual independence, a plurality of power conversion modules inefficacy wherein, only need to change inefficacy person can, moreover, the utility model discloses a power conversion system's auxiliary power supply still possesses a plurality of output ports, can be many loads power supplies simultaneously.
The above description will be described in detail with reference to the embodiments, and a further explanation will be provided for the technical solution of the present invention.
Drawings
In order to make the aforementioned and other objects, features, advantages and embodiments of the invention more comprehensible, the following description is given:
fig. 1 is a schematic structural diagram of a power conversion system according to the present invention;
FIG. 2 is a schematic diagram of a preferred embodiment of the power conversion system of the present invention;
fig. 3 is a schematic structural diagram of a power conversion system according to a second preferred embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power conversion system according to a third preferred embodiment of the present invention;
fig. 5 is a schematic diagram of a preferred topology of of an th auxiliary power unit of the power conversion system of the present invention.
Detailed Description
For a more complete and complete description of the present invention, reference is made to the accompanying drawings and the following description of various embodiments, in which like numerals represent the same or similar elements, and in addition , well-known elements and steps are not depicted in the embodiments to avoid unnecessarily limiting the present invention.
As shown in fig. 1, the power conversion system 100 of the present invention may include a main power unit 10 and a -th auxiliary power source 20, wherein the main power unit 10 includes a plurality of power conversion modules 11, in the embodiment shown in fig. 1, the power conversion modules 11 are exemplified by N, that is, include a power conversion module 1, a power conversion module 2, … …, a power conversion module N, wherein the input terminals of each power conversion module 11 are connected in series, for example, to R phase, the -th auxiliary power source 20 is disposed outside the main power unit 10, that is, outside the power conversion modules 11, and includes at least -th -th auxiliary power source units 21, wherein the -th auxiliary power source unit 21 is electrically connected to and supplies auxiliary power to at least -4 power conversion modules 11, in embodiments, the -th auxiliary power source 20 includes a plurality of -th auxiliary power source units 21, for example, N is the same number as the power conversion modules 11, the -th auxiliary power source units 21 are electrically connected to the corresponding power conversion modules 11, for providing corresponding auxiliary power conversion modules 8930, and providing auxiliary power conversion voltage for each of the 8536, which is corresponding to the auxiliary power conversion module 21, and receives auxiliary power conversion module .
In the present invention, the "external power supply" refers to a power supply other than the power conversion module and the system main power circuit. And, the external power source is flexible to select, and the external power source can be alternating current, direct current, for example, the external power source can be alternating current electric wire netting, direct current distribution bus, etc.
Of course, it is understood that in other embodiments, the th voltage may be the same as the second voltage, and these are not intended to limit the present invention.
In the present invention, every th auxiliary power supply unit 21 can be provided with at least output ports, and at least thereof is electrically connected to the corresponding power conversion module, in the embodiment shown in fig. 1, every th auxiliary power supply unit shows three output ports, for example, including the output ports 21-1, 21-2, 21-3, and output ports 21-1 thereof are electrically connected to the corresponding power conversion module 11 for auxiliary power supply thereof, and the other output ports 21-2, 21-3 can be connected to other loads for power supply thereof.
Therefore, compared with the prior art, the utility model discloses a auxiliary power supply 20 is provided input voltage by external power supply (for example external power supply 30), can need not to drop into the main power return circuit power of power conversion module and supply power, therefore the power conversion module can be convenient carry out system program update, debug etc. operation in advance aspect, under the general condition, the voltage level of main power return circuit can be much higher than auxiliary power supply's voltage level, consequently at program update and debug loop, the system is supplied power by auxiliary power of lower voltage level, can have higher security and reliability, moreover, the utility model provides a auxiliary power supply unit is provided with a plurality of output ports, can be many loads power simultaneously, after the main power return circuit power of power conversion module cuts off, the utility model discloses a auxiliary power still has the electricity, can ensure that the state of system control unit to each part is controllable, step, the utility model discloses a 2 auxiliary power supply sets up outside power conversion module, both independently, these change of each other, the power conversion module , wherein the internal power conversion module only needs to fail, if the whole of the power conversion module fails, the person of the whole is unable to fail.
The power conversion system of the present invention will be described in detail in reference to the preferred embodiments of fig. 2-4, at step .
As shown in fig. 2, the structure of th preferred embodiment of the power conversion system of the present invention is different from the structure of fig. 1 in that in the power conversion system 200 of the present embodiment, each power conversion module 11 further includes a th sub-module 111, a second sub-module 112 and a transformer 113, the th sub-module 111 is electrically connected to the th side winding of the transformer 113, and the second sub-module 112 is electrically connected to the secondary side winding of the transformer 113, wherein the input terminals of the th sub-module 111 of each power conversion module 11 are connected in series.
, the power conversion system 200 further includes a second auxiliary power source 40 disposed outside the plurality of power conversion modules 11 (e.g., power conversion modules 1-N), and receiving a third voltage provided by a second external power source 50 and outputting a fourth voltage, wherein the second auxiliary power source 40 is electrically connected to the second sub-module 112 of each power conversion module 11 to provide auxiliary power thereto.
In this embodiment, the structure of the second auxiliary power source 40 may be the same as that of the th auxiliary power source 30, that is, the second auxiliary power source may include a plurality of second auxiliary power source units (not shown) electrically connected to the second sub-modules 112 of the power conversion modules 11, wherein each second auxiliary power source unit receives the third voltage provided by the second external power source 50 and outputs the fourth voltage to the corresponding second sub-module 112 of the power conversion module 11, and in step , in embodiments, the circuit topologies of the th auxiliary power source unit and the second auxiliary power source unit may be the same, but the disclosure is not limited thereto, and the circuit topologies of the th auxiliary power source unit and the second auxiliary power source unit may also be different.
In the embodiment shown in fig. 2, the th auxiliary power supply 20 and the second auxiliary power supply 40 both provide input voltage by external power supply, and system program updating and pre-debugging can be conveniently and anytime without switching into the main power loop power supply.
Referring to fig. 3, which shows the structure of a second preferred embodiment of the power conversion system of the present invention, the differences from the embodiment shown in fig. 2 will be described in detail. In the present embodiment, the outputs of the power conversion modules 11 of the main power unit 10 of the power conversion system 300 are connected in parallel, but the present disclosure is not limited thereto.
, each power conversion module 11 further includes a control unit 114, the control unit 114 is used for controlling the operation of the th sub-module 111 in the power conversion module 11. each th auxiliary power supply unit 21 has a th output port 211, and the th output port 211 is electrically connected to the corresponding control unit 114 of the power conversion module 11 for providing auxiliary power thereto.
Further , each power conversion module 11 further includes auxiliary circuits 115 in each , the auxiliary circuits 115 are electrically connected to the th sub-module 111, for example, a charging and discharging circuit, which can charge or discharge a dc bus of the th sub-module 111, wherein each th th auxiliary power supply unit 21 has a second output port 212, the second output port 212 is electrically connected to the corresponding auxiliary circuit 115 of the power conversion module 11 to provide an auxiliary power supply for the auxiliary circuit, in this embodiment, the auxiliary circuit 115 is electrically connected to the control unit 114, and the control unit 114 controls the auxiliary circuit 115 to charge or discharge the dc bus.
, the power conversion system 300 further includes a plurality of bypass units 60, such as N, disposed outside the plurality of power conversion modules 11 (e.g., power conversion modules 1-N), wherein each bypass unit 60 is connected in parallel with the th sub-module 111 of the corresponding power conversion module 11, and each th auxiliary power unit 21 has a third output port 213, and the third output port 213 is electrically connected to the corresponding bypass unit 60 to supply power to the bypass unit 60. in this embodiment, the bypass unit 60 may be a controllable switch, for example.
In the embodiment, the power supply of the bypass unit 60 comes from the th auxiliary power supply 20, and is independent of the power conversion module 11 and the main loop power supply thereof, so that after power conversion modules fail, the power conversion modules can be reliably bypassed in time through the bypass unit 60 without affecting the operation of other power conversion modules, and the bypass unit 60 is arranged outside the power conversion modules 11, so that the failed power conversion modules can be conveniently subjected to hot swap.
Further , in this embodiment, the second auxiliary power source 40 is also powered by the external power source 30, i.e. the second external power source and the external power source can also be the same as external power sources, and at this time, the input terminal of the th auxiliary power source 20 and the input terminal of the second auxiliary power source 40 are connected to the external power source (i.e. the external power source 30) in parallel, in this embodiment, the structure of the second auxiliary power source 40 may be the same as that of the th auxiliary power source 20, and both the th auxiliary power source unit and the second auxiliary power source unit may be isolated conversion circuits.
In this embodiment, the -th auxiliary power supply unit 21 is provided with a plurality of output ports (211, 212, 213), so that power can be supplied to the corresponding bypass unit 60 and the control unit 114 and the auxiliary circuit 115 of the power conversion module 11, respectively, and the structure is simple, convenient and reliable.
In , the th auxiliary power supply unit 21 may further have a plurality of other output ports, and the plurality of output ports are respectively connected to different power conversion modules and provide auxiliary power thereto.
As shown in fig. 4, which illustrates the structure of the third preferred embodiment of the power conversion system of the present invention, the difference from the embodiment shown in fig. 2 is that the power conversion system 400 of the present embodiment is a three-phase power conversion system, i.e. having R, S and T phases, each phase having main power units, e.g. including main power units 10-1, 10-2, 10-3, which are connected to the R, S and T phases, respectively, wherein each phase of main power units 10-1, 10-2, 10-3 includes a plurality of power conversion modules 11 (e.g. power conversion modules 1-N), and the input terminals of the power conversion modules 1-N of each phase are connected in series (e.g. the input terminals of the power conversion modules 1-N of each phase are connected in series to the R, S and T phases to receive their input voltages, respectively), the output terminals of the power conversion modules 1-N of each phase are connected in parallel, in this embodiment, the three-phase of main power units 10-1, 10-2, 10-3 are connected in parallel to the output terminal of the power conversion module 18, respectively, and the auxiliary power conversion modules 215 are connected in parallel, 10-3, and the power output terminal of this case includes at least three auxiliary power output terminals 215, e.g. 10-3, 10-3, respectively.
Although fig. 4 illustrates a three-phase power conversion system, the structure shown in fig. 4 can also be applied to a two-phase power conversion system, and step , it is understood that the structure of the power conversion system 400 shown in fig. 4 can also include the bypass unit 60, the control unit 114, and the auxiliary circuit 115 shown in fig. 3, and each th th auxiliary power supply unit 21 can provide auxiliary power for the corresponding bypass unit 60, the control unit 114, and the auxiliary circuit 115, respectively.
As shown in fig. 5, it shows the preferred topology of of th auxiliary power supply unit of the present invention, i.e. th auxiliary power supply unit is LLC-DCX circuit, wherein, the th voltage (e.g. 24VDC) inputted from th external power supply generates unstable output voltage (e.g. 27-40VDC) through open loop of LLC-DCX circuit, and outputs stable second voltage (e.g. 15VDC) through BUCK circuit, especially, by using two-stage transformer isolation (or -stage solid insulation transformer isolation), it can achieve the requirement of medium voltage insulation between th voltage and second voltage, so that th auxiliary power supply can meet the requirement of medium voltage insulation, of course, it can be understood that the structure of this second auxiliary power supply unit and this th auxiliary power supply unit of the present invention can be the same.
The utility model discloses a set up the auxiliary power supply outside the power conversion module to provide input voltage by external power source (like the commercial power), can not receive the influence that main power return circuit power drops into and the excision, the system has higher security and reliability, and, the utility model discloses an utilize auxiliary power supply unit to receive the th voltage that external power source provided, and export the second voltage, and the second voltage sets up a plurality of port outputs, can be the bypass circuit of power conversion module, the control unit of submodule and auxiliary circuit auxiliary power supply, also can be for double-phase and above power conversion system auxiliary power supply, have the advantage of many loads power supplies promptly.
The utility model discloses an application area includes but not limited to: the system comprises a medium-high voltage power electronic transformer system, a grid-connected inverter system, an energy storage inverter system, a new energy power generation system with energy storage, a micro-grid system composed of distributed power generation units, energy storage units, local loads and the like.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (17)
- A power conversion system of the type , comprising:a main power unit including a plurality of power conversion modules, wherein input terminals of the power conversion modules are connected in series; anda th auxiliary power supply, disposed outside the main power unit, where the th auxiliary power supply includes at least 0 th 1 th auxiliary power supply units, and the 2 th auxiliary power supply unit is electrically connected with at least th power conversion modules and supplies power to the power conversion modules in an auxiliary manner, where every th th auxiliary power supply unit receives a th voltage provided by a th external power supply and outputs a second voltage to the corresponding power conversion module, and every th th auxiliary power supply unit is provided with a plurality of output ports, where at least a output port is electrically connected to the corresponding power conversion module.
- 2. The power conversion system of claim 1, wherein the th auxiliary power supply comprises a plurality of th auxiliary power supply units corresponding to and for assisting the plurality of power conversion modules .
- 3. The power conversion system according to claim 1, wherein the th auxiliary power supply unit is provided with a plurality of output ports, and the plurality of output ports are respectively connected to and supply auxiliary power to different power conversion modules.
- 4. The power conversion system of claim 2, wherein each power conversion modules includes a th sub-module, a second sub-module, and a transformer, the th sub-module is electrically connected to the secondary side winding of the transformer, the second sub-module is electrically connected to the secondary side winding of the transformer, and the inputs of the th sub-modules of the plurality of power conversion modules are connected in series.
- 5. The power conversion system of claim 4, wherein the th auxiliary power unit is electrically connected to and assists the th sub-module.
- 6. The power conversion system of claim 4, further comprising:and the input end of the second auxiliary power supply is electrically connected with a second external power supply, and the output end of the second auxiliary power supply is electrically connected to the second submodule of each power conversion module to supply power for the power conversion modules in an auxiliary mode.
- 7. The power conversion system of claim 6,the second auxiliary power supply includes a plurality of second auxiliary power supply units electrically connected to the second sub-modules of the power conversion module, respectively, wherein each of the second auxiliary power supply units receives a third voltage provided by the second external power supply and outputs a fourth voltage to the corresponding second sub-module of the power conversion module.
- 8. The power conversion system of claim 4,each the power conversion module further includes a control unit for controlling the th sub-module of the corresponding power conversion module, wherein,each th th auxiliary power supply unit has a th output port, and the th output port is electrically connected to the control unit of the corresponding power conversion module.
- 9. The power conversion system of claim 8,each , the power conversion module further includes an auxiliary circuit electrically connected with the th sub-module of the corresponding power conversion module, wherein,each th th auxiliary power supply unit has a second output port electrically connected to the corresponding auxiliary circuit of the power conversion module.
- 10. The power conversion system of claim 9, wherein the auxiliary circuit is an charge-discharge circuit, and the auxiliary circuit is controlled by the control unit.
- 11. The power conversion system of claim 4, further comprising:a plurality of bypass units disposed outside the plurality of power conversion modules, the plurality of bypass units corresponding to the plurality of power conversion modules and connected in parallel with the th sub-module of the corresponding power conversion module, wherein,each the th auxiliary power supply unit has a third output port electrically connected to the corresponding bypass unit.
- 12. The power conversion system of claim 6, wherein the second external power source and the th external power source are the same external power source, and wherein an input of the th auxiliary power source and an input of the second auxiliary power source are connected in parallel to the external power source.
- 13. The power conversion system of claim 1, wherein the th auxiliary power supply unit is an isolated converter circuit.
- 14. The power conversion system of claim 13, wherein the th auxiliary power supply unit is an LLC-DCX circuit.
- 15. The power conversion system of any , comprising a multi-phase main power unit, wherein each phase main power unit comprises a plurality of said power conversion modules, wherein the inputs of the plurality of said power conversion modules of each phase main power unit are connected in series, and wherein each of said th auxiliary power supply unit is electrically connected to the corresponding power conversion module of each phase main power unit for auxiliary power supply thereof.
- 16. The power conversion system of claim 15, wherein the outputs of a plurality of the power conversion modules in each phase of the main power unit are connected in parallel.
- 17. The power conversion system of claim 16, wherein the outputs of the multi-phase main power cells are connected in parallel.
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| CN201921035503.7U CN210007623U (en) | 2019-07-04 | 2019-07-04 | Power conversion system |
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| CN201921035503.7U CN210007623U (en) | 2019-07-04 | 2019-07-04 | Power conversion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023011391A1 (en) * | 2021-08-03 | 2023-02-09 | 华为数字能源技术有限公司 | Power unit and solid-state transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023011391A1 (en) * | 2021-08-03 | 2023-02-09 | 华为数字能源技术有限公司 | Power unit and solid-state transformer |
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