CN209217974U - A kind of four port electric power electric transformer topological structures - Google Patents
A kind of four port electric power electric transformer topological structures Download PDFInfo
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Abstract
The utility model discloses a kind of four port electric power electric transformer topological structures, including high-voltage alternating is to low-voltage direct converter unit, the supreme pressure DC converting unit of low-voltage direct, low-voltage direct to low-voltage alternating-current converter unit and external four part of output interface of low-voltage direct；Above four part is interconnected by low-voltage direct port, while can be realized the two-way flow of power；The utility model fully considers power grid architecture, various energy resources situation and user demand in application end, fully considers current technology development condition at technology end, realizes the high efficiency of transmission of energy in micro-grid system.
Description
Technical field
The utility model belongs to a kind of integrated high voltage suitable for micro-capacitance sensor and exchanges, high voltage direct current, 750V DC and low
Press four port electric power electric transformer topological structures of exchange.
Background technique
With the continuous upgrading of energy demand, traditional fossil energy is increasingly difficult to due to its pollution and scarcity with full
Sufficient energy demand.Currently, for using increasingly strong, the corresponding installed capacity as the renewable energy demand of representative of photovoltaic, wind-powered electricity generation
Growth all exponentially.Future is even more the principal mode having an opportunity as energy supply.But it is extensive in renewable energy
Using while, disadvantage is also gradually exposed, and dispersibility in time and geographically is difficult to it by effective benefit
With.Importantly, conventional electric power system carries out rack building according to major network, in this mode, for the reality of renewable energy
When, efficient, stable utilization bring huge difficulty.Therefore, in order to adapt to the development of renewable energy, Future Power System
Framework need to be optimized.
In order to promote the effective use of renewable energy, intelligent micro-grid is receive more and more attention.By over the ground
Area's power grid carries out the elements such as source, net, lotus, storage and is configured, and can guarantee the on-site elimination of renewable energy, realizes regional power grid
Economical operation.It is promoted simultaneously for the stability of regional power grid and there is facilitation for whole Optimal network frame.
Intelligent micro-grid is the trend of future development, but in its project implementing process, needs corresponding primary, secondary dress
It is standby that support is provided.In the design of primary device, need to fully take into account the interface of different energy sources situation, at present existing power grid frame
Structure, efficient energy source, the technical level of electric power users demand and current intelligent device.In traditional electric network composition,
Often using transformer as key node, the distribution of electric energy is carried out, corresponding source, net, storage, lotus element are connected directly to transformer
Corresponding port.But it is this be framed in following application have the shortcomings that it is multinomial.Transformer is often two ports first, more than more
The electric energy transmission of kind form needs more transformers to carry out the transformation of each level, and transform part is excessive on the whole, secondly,
Transformer is constructed according to passive device, the ability without corresponding active response in conversion process, and can not achieve for
Power grid support under malfunction, last traditional transformer are not used to building DC network, and DC network is efficient due to it
Property have received more and more concerns, while the Energy situations such as photovoltaic, energy storage are also DC network, and DC network is for following micro-
The rack of power grid is most important.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the purpose of the utility model is to provide four port electric power electricity of one kind
Sub- converter topology fully considers power grid architecture, various energy resources situation and user demand in application end, fills at technology end
Divide and consider current technology development condition, realizes the high efficiency of transmission of energy in micro-grid system.
In order to achieve the goal above, the utility model adopts the following technical solution:
A kind of four port electric power electric transformer topological structures, including high-voltage alternating is to low-voltage direct converter unit 1, low pressure
The supreme pressure DC converting unit 2 of direct current, low-voltage direct to low-voltage alternating-current converter unit 3 and the external output interface 4 of low-voltage direct
Four parts；Above four part is interconnected by low-voltage direct port 5, while can be realized the two-way flow of power.
The high-voltage alternating to low-voltage direct converter unit 1 includes high-voltage alternating side 11, the first filter reactor 12, first
Power module 13 and the first low-voltage direct side 14, wherein the first power module 13 includes H bridge inversion unit 131 and the first isolation
Type DC-DC converter 132, the first isolation type DC-DC converter 132 is using double active bridge topologys；High-voltage alternating is to low-voltage direct
The high-voltage alternating side 11 of converter unit 1 includes ABC three-phase, and in each phase, 12 one end of the first filter reactor is connected to high pressure
11 1 phase of side is exchanged, the other end is connected to the first power module 13, and the first power module 13 is realized and the by cascade mode
The connection of one filter reactor 12,13 other end of the first power module are connected to the first low-voltage direct side 14, while in low-pressure direct
Stream side ABC three phase power module is connected by the way of in parallel.
The supreme pressure DC converting unit 2 of low-voltage direct includes high voltage direct current side 21, the second filter reactor 22, second
Power module 23 and the second low-voltage direct side 24, wherein the second power module 23 includes H bridge unit 231 and the second isolated form DC-
DC converter 232, the second isolation type DC-DC converter 232 is using double active bridge topologys；Wherein 22 one end of the second filter reactor
It is connected to high voltage direct current side 21, other end is connected to the second power module 23, and the second power module 23 passes through cascade mode
Realize the connection with the second filter reactor 22,23 other end of the second power module is connected to the second low-voltage direct side 24, simultaneously
It is connected by the way of multiple power module parallels in low-voltage direct side 24.
The low-voltage direct to low-voltage alternating-current converter unit 3 includes low-voltage alternating-current side 31, third filter reactor 32, filtering
Capacitor 33 and three phase full bridge circuit 34 and third low-voltage direct side 35, wherein it is defeated to be connected in parallel on low-voltage alternating-current side 31 for filter capacitor 33
Outlet, 32 one end of third filter reactor are connected to low-voltage alternating-current side 31, and the other end is connected to three phase full bridge circuit 34, and three-phase is complete
The output end of bridge circuit 34 is third low-voltage direct side 35.
The external output interface 4 of low-voltage direct includes capacitor 41, IGBT42 and diode 43, wherein 41 liang of capacitor
End is connected to low-voltage direct bus, and 41 anode of capacitor is connected to IGBT42 current collection grade, and IGBT42 emitter is connected to externally defeated
The anode of outgoing interface, while the externally anode of the cathode connecting diode 43 of route, the cathode of external route connect diode 43
Cathode.
The beneficial effects of the utility model are:
The utility model proposes the topological structure of four port electric power electric transformers, the electric power under the framework for micro-capacitance sensor
Electronic transformer has following advantage: 1) different voltages grade realize efficiently interconnection, facilitate source in micro-grid system, net, lotus,
The unified allocation of resources of storage, high-voltage alternating are the grades of conventional AC power grid, and can be realized that power grid takes by the connection of the port can be with
And remaining electricity online；High voltage direct current can guarantee the high efficiency of transmission of energy due to lower line impedance relative to high-voltage alternating；
Low-voltage direct low-voltage DC net mainly for renewable load and renewable energy power generation, DC characteristic facilitate photovoltaic,
The access of charging pile, energy storage etc.；Low-voltage alternating-current power grid is the connectivity port of traditional load, and traditional family electricity consumption may be implemented.2) sharp
With the mapping mode based on power electronics, multiple more intelligent transformation of electrical energies may be implemented.Traditional power transformer uses nothing
Source device is converted, and power grid can only be passively distributed, and uses electric power electric transformer, can not only complete traditional load
Distribution, while can be realized the energy source dispensing of active, control model abundant may be implemented by power electronic circuit, realize electricity
Intelligent energy allotment is completed in voltage-controlled system, power control and sagging control etc.；3) quickly failure response and failure every
From, by the signal acquisition of high speed, quick power electronic devices locking can be carried out when failure occurs, simultaneously because
High-pressure side connects the power module for being all made of isolation, and the Fault Isolation of high and low pressure side may be implemented in circuit topology；4) high-pressure side
Using modular multilevel cascade system, it is ensured that exchange exports good waveform quality, and can be using common pressure resistance etc.
The power electronic power device of grade realizes that high pressure is directly accessed；5) low pressure is realized using the circuit arrangement structure of IGBT+ diode
DC bus external interface, it is ensured that lesser on-state loss in steady state operation, while can guarantee fastly in failure
Speed cutting, guarantees the stable operation of other ports；6) circuit structure that three phase full bridge is used in exchange side, can be realized family side
The low voltage crossing of system guarantees that system in case of a fault can be with continuous service.
Detailed description of the invention
Fig. 1 is four port electric power electric transformer topology diagrams.
Fig. 2 is high-voltage alternating to low-voltage direct converter unit topology diagram, in which: Fig. 2 a is high-voltage alternating to low-pressure direct
Converter unit overall topology figure is flowed, Fig. 2 b is power module topological diagram.
Fig. 3 is the supreme pressure DC converting unit topology diagram of low-voltage direct, in which: Fig. 3 a is low-voltage direct to high straightening
Converter unit overall topology figure is flowed, Fig. 3 b is power module topological diagram.
Fig. 4 is low-voltage direct to low-voltage alternating-current converter unit topology diagram.
Fig. 5 is the external output interface figure of low-voltage direct.
Fig. 6 is the external output interface working principle diagram of low-voltage direct, in which: Fig. 6 a is to operate normally working principle diagram, figure
6a is malfunction working principle diagram.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description.
The overall topology of four port electric power electric transformers is as shown in Figure 1:
In view of the application scenarios of four ports, according to high-voltage alternating-low-voltage direct, low-voltage direct-height in topological structure
Straightening stream, low-voltage direct-low-voltage alternating-current carry out the configuration on device, and the external output interface of low-voltage direct configures corresponding IGBT and two
Pole pipe；I.e. include high-voltage alternating to low-voltage direct converter unit 1, the supreme pressure DC converting unit 2 of low-voltage direct, low-voltage direct extremely
Low-voltage alternating-current converter unit 3 and external 4 four part of output interface of low-voltage direct.Four ports can guarantee different voltages grade
Energy access, low-voltage alternating-current is user's typical stage voltage class, and low-voltage direct can realize the interfaces such as distributed power generation, energy storage,
High-pressure side can connect AC distribution net, while efficient electric energy transmission may be implemented in high voltage direct current.
It is as shown in Figure 2 for high-voltage alternating-low-voltage dc circuit topological structure:
High-voltage alternating to low-voltage direct converter unit 1 includes high-voltage alternating side 11, the first filter reactor 12, the first power
Module 13 and the first low-voltage direct side 14, wherein the first power module 13 includes H bridge inverter unit 131 and the first isolated form DC-
DC converter 132, the first isolation type DC-DC converter 132 is using double active bridge topologys；High-voltage alternating to low-voltage direct converts single
The high-voltage alternating side 11 of member 1 includes ABC three-phase, and in each phase, 12 one end of the first filter reactor is connected to high-voltage alternating side
11 1 phases, the other end are connected to the first power module 13, and the first power module 13 is realized and the first filtering by cascade mode
The connection of reactor 12,13 other end of the first power module are connected to the first low-voltage direct side 14, while in low-voltage direct side ABC
Three phase power module is connected by the way of in parallel.
Using the connection type of cascade connection multi-level, the modularized design of device may be implemented, utilize the electric power of common low pressure
Electronic device realizes the access of high-pressure side power grid, while the topology is based on double active bridge+H-bridge circuits, can guarantee the height of circuit
Stable operation is imitated, under nonserviceabling, Fault Isolation may be implemented.
It is as shown in Figure 3 for low-voltage direct-hvdc circuit topological structure:
The supreme pressure DC converting unit 2 of low-voltage direct includes high voltage direct current side 21, the second filter reactor 22, the second power
Module 23 and the second low-voltage direct side 24, wherein the second power module 23 includes that H-bridge unit 231 and the 2nd DC-DC of isolated form become
Parallel operation 232, the second isolation type DC-DC converter 232 is using double active bridge topologys；Wherein 32 one end of the second filter reactor connects
To high voltage direct current side, other end is connected to the second power module 23, the second power module 23 by cascade mode realize with
The connection of second filter reactor 22,23 other end of the second power module are connected to the second low-voltage direct side 24, while second
Low-voltage direct side 24 is connected by the way of multiple power module parallels.
Using the connection type of cascade connection multi-level, the modularized design of device may be implemented, utilize the electric power of common low pressure
Electronic device realizes the access of high pressure, while the topology is based on double active bridge+H-bridge circuits, for the application of high voltage direct current side, benefit
But DC output voltage can be effectively adjusted with H bridge, while nonserviceabling lower realizing DC Line Fault self-cleaning.
It is as shown in Figure 4 for low-voltage direct-low-voltage alternating-current circuit topological structure:
Low-voltage direct to low-voltage alternating-current converter unit 3 includes low-voltage alternating-current side 31, third filter reactor 32, filter capacitor
33 and three phase full bridge circuit 34 and third low-voltage direct side 35, wherein filter capacitor 33 is connected in parallel on the output of low-voltage alternating-current side 31
End, 32 one end of third filter reactor are connected to low-voltage alternating-current side 31, and the other end is connected to three phase full bridge circuit 34, three phase full bridge
The output end of circuit 34 is third low-voltage direct side 35.
Direct current may be implemented to the transformation of electrical energy exchanged, using power electronic equipment, kHz using three phase full bridge circuit
The switching frequency of grade can guarantee the power quality of low-voltage alternating-current circuit, while fault traversing can be achieved in AC fault
Configuration.
It is as shown in Figure 5 for the external port circuit topological structure of low-voltage direct:
The external output interface 4 of low-voltage direct includes capacitor 41, IGBT42 and diode 43, wherein 41 both ends of capacitor
It is connected to low-voltage direct bus, 41 anode of capacitor is connected to IGBT42 current collection grade, and IGBT42 emitter is connected to external output
The anode of interface, while the externally anode of the cathode connecting diode 43 of route, 43 yin of cathode connection diode of external route
Pole.
The external output interface effect of low-voltage direct is primarily to realize the isolation of low-voltage direct port external fault.If not yet
There is related device to realize Fault Isolation, then fault current can be passed quickly after short trouble occurs for low-voltage direct outside port
It is handed to inside electric power electric transformer device, since low-voltage direct is intermediate bus bar, the device on each port breaks down,
Each port is caused to be latched.In order to realize that Fault Isolation uses topological structure as shown in Figure 5, in normal operating conditions,
IGBT conducting electric current can realize bi-directional.Current direction is as shown in Figure 6.It nonserviceables after generation, IGBT quick lock, therefore
Barrier electric current flows through diode.The fault current may not flow into four port electric power electric transformer devices, other ports can stablize
Operation.
Claims (5)
1. a kind of four port electric power electric transformer topological structures, it is characterised in that: converted including high-voltage alternating to low-voltage direct
The supreme pressure DC converting unit (2) of unit (1), low-voltage direct, low-voltage direct to low-voltage alternating-current converter unit (3) and low-pressure direct
Flow external (4) four part of output interface；Above four part is interconnected by low-voltage direct port (5), while can be realized function
The two-way flow of rate.
2. four ports electric power electric transformer topological structure according to claim 1, it is characterised in that: the high-voltage alternating
To low-voltage direct converter unit (1) include high-voltage alternating side (11), the first filter reactor (12), the first power module (13) and
First low-voltage direct side (14), wherein the first power module (13) includes H bridge inverter unit (131) and the first isolated form DC-DC
Converter (132), the first isolation type DC-DC converter (132) is using double active bridge topologys；High-voltage alternating to low-voltage direct converts
The high-voltage alternating side (11) of unit (1) includes ABC three-phase, and in each phase, the connection of the first filter reactor (12) one end is supreme
Pressure exchange (11) one phase of side, the other end are connected to the first power module (13), and the first power module (13) passes through cascade mode
Realize the connection with the first filter reactor (12), the first power module (13) other end is connected to the first low-voltage direct side
(14), it while in low-voltage direct side ABC three phase power module is connected by the way of in parallel.
3. four ports electric power electric transformer topological structure according to claim 1, it is characterised in that: the low-voltage direct
Supreme pressure DC converting unit (2) include high voltage direct current side (21), the second filter reactor (22), the second power module (23) and
Second low-voltage direct side (24), wherein the second power module (23) includes that H-bridge unit (231) and the second isolated form DC-DC are converted
Device (232), the second isolation type DC-DC converter (232) is using double active bridge topologys；Wherein the second filter reactor (22) one end
It is connected to high voltage direct current side (21), other end is connected to the second power module (23), and the second power module (23) passes through cascade
Mode realize the connection with the second filter reactor (22), the second power module (23) other end is connected to the second low-voltage direct
Side (24), while being connected by the way of multiple power module parallels in low-voltage direct side (24).
4. four ports electric power electric transformer topological structure according to claim 1, it is characterised in that: the low-voltage direct
It include low-voltage alternating-current side (31), third filter reactor (32), filter capacitor (33) and three to low-voltage alternating-current converter unit (3)
Phase full-bridge circuit (34) and third low-voltage direct side (35), wherein filter capacitor (33) is connected in parallel on low-voltage alternating-current side (31) output
End, third filter reactor (32) one end are connected to low-voltage alternating-current side (31), and the other end is connected to three phase full bridge circuit (34), and three
The output end of phase full-bridge circuit (34) is third low-voltage direct side (35).
5. the four ports electric power electric transformer topological structure according to claim 1, it is characterised in that: the low-voltage direct
External output interface (4) includes capacitor (41), IGBT (42) and diode (43), and wherein capacitor (41) both ends are connected to low
DC bus is pressed, capacitor (41) anode is connected to IGBT (42) current collection grade, and IGBT (42) emitter is connected to externally output and connects
The anode of mouth, while the externally anode of the cathode connecting diode (43) of route, the cathode of external route connect diode (43)
Cathode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821637531.1U CN209217974U (en) | 2018-10-09 | 2018-10-09 | A kind of four port electric power electric transformer topological structures |
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| CN201821637531.1U CN209217974U (en) | 2018-10-09 | 2018-10-09 | A kind of four port electric power electric transformer topological structures |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
| CN116885969A (en) * | 2023-09-07 | 2023-10-13 | 西安为光能源科技有限公司 | AC/DC electric energy conversion system |
-
2018
- 2018-10-09 CN CN201821637531.1U patent/CN209217974U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
| CN116885969A (en) * | 2023-09-07 | 2023-10-13 | 西安为光能源科技有限公司 | AC/DC electric energy conversion system |
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