CN214707170U

CN214707170U - Energy router

Info

Publication number: CN214707170U
Application number: CN202120578000.5U
Authority: CN
Inventors: 连建阳; 卢宇; 谢晔源
Original assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Current assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-12
Anticipated expiration: 2031-03-22

Abstract

The utility model provides an energy router, which comprises a parallel transformer, a series transformer, a first port, a second port, a first AC/DC conversion unit and a second AC/DC conversion unit; the primary side of the parallel transformer is connected with the first port, and the secondary side of the parallel transformer is connected with the alternating current input end of the first alternating current-direct current conversion unit; the primary side of the series transformer is connected between the first port and the second port in series, the secondary side of the series transformer is connected with the alternating current input end of the second alternating current-direct current conversion unit, and the primary side of the series transformer is connected with the bypass switch in parallel; and the direct current sides of the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit are connected in parallel and then are connected to a third port. The utility model provides a technical scheme, the trend of first port and second port just can be adjusted through the primary voltage of control series transformer. Compared with an alternating current-direct current-alternating current mode, the alternating current-direct current conversion device has the advantages that the power flow with the same power is adjusted, and the equipment capacity of the first alternating current-direct current conversion unit and the equipment capacity of the second alternating current-direct current conversion unit can be reduced by 70% -90%.

Description

Energy router

Technical Field

The utility model relates to a power electronic technology field, concretely relates to energy router.

Background

The existing medium-voltage energy router mainly comprises two major types, one is a power electronic transformer, the other is a power electronic transformer which adopts an alternating-current and direct-current conversion unit to convert alternating current into direct current, medium-voltage direct current is converted into low-voltage direct current through a direct-current transformer, and then direct current is converted into alternating current through the alternating-current and direct-current conversion unit. The mode is widely used in medium-low voltage alternating current and direct current micro-grids.

With the development of modern power electronic technology, the application and development of single-tube power semiconductor devices are greatly limited due to the relatively limited voltage-resistant grade of the single-tube power semiconductor devices.

The power semiconductor device forms sub-modules (or called power units) and then is cascaded to form a converter chain, so that the voltage grade requirement of the module can be easily met, and the power semiconductor device is a mode with higher cost performance compared with other schemes. However, once the converter chain is subjected to overvoltage, or voltage unevenness exists among the sub-modules of the converter chain, the voltage of the individual sub-modules is too high, and even the sub-modules are damaged by the overvoltage. The fault expansion can cause the fault damage of the whole converter chain.

The two modes are only suitable for medium and low voltage power grids and not suitable for alternating current power grids of 110kV or more because of the factors of voltage-resistant grade of a power semiconductor device, equipment manufacturing cost, equipment occupied area and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides an energy router.

In order to achieve the above purpose, the technical scheme of the utility model is that:

an energy router, comprising:

at least one shunt transformer;

at least one series transformer;

the first port, the second port, the third port, the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit are arranged on the shell;

the primary side of the parallel transformer is connected with the first port, and the secondary side of the parallel transformer is connected with the alternating current input end of the first alternating current-direct current conversion unit; the primary side of the series transformer is connected between the first port and the second port in series, the secondary side of the series transformer is connected with the alternating current input end of the second alternating current-direct current conversion unit, and the primary side of the series transformer is connected with the bypass switch in parallel;

the direct current sides of the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit are connected in parallel and then are connected to a third port, the first port and the second port are alternating current ports, and the third port is a direct current port.

Further, the first port and the second port are three-phase cross flow ends.

Further, the first ac-dc conversion unit and the second ac-dc conversion unit adopt a modular multilevel topological structure or a three-phase bridge topological structure.

The high-voltage direct current conversion device further comprises a fourth port, the fourth port is connected with the third port through the direct current conversion unit, the third port is connected with a high-voltage access end of the direct current conversion unit, and a low-voltage output end of the direct current conversion unit is connected with the fourth port.

The third port is connected with a direct current input end of the third alternating current-direct current conversion unit, and an alternating current output end of the third alternating current-direct current conversion unit is connected with the fifth port.

Further, the device also comprises a load connected with the third port.

Furthermore, the device also comprises a first switch and a second switch, wherein the first switch is connected between the first port and the primary side of the series transformer in series, and the second switch is connected between the first switch and the primary side of the series transformer in parallel.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model provides a technical scheme can just can adjust the trend of first port and second port through the primary voltage of control series transformer. Compared with an alternating current-direct current-alternating current mode, the alternating current-direct current conversion device has the advantages that the power flow with the same power is adjusted, and the equipment capacity of the first alternating current-direct current conversion unit and the equipment capacity of the second alternating current-direct current conversion unit can be reduced by 70% -90%. The capacity of the equipment and the cost of the equipment are basically in a linear relationship, and the cost of the equipment can be greatly reduced by adopting the scheme.

The utility model provides a third port is the direct current port. The direct current port can be directly connected with direct current source loads such as photovoltaic, charging pile, energy storage and the like, so that the on-site consumption and control of energy are realized, the alternating current-direct current conversion times are reduced, and the utilization efficiency of the energy is improved.

Additionally, the utility model provides a direct current conversion unit such as dc transformer or alternating current-direct current conversion unit also can be inserted to the third port, realizes the interconnection of different alternating current grades, different direct current voltage grades, founds the energy router of multiport.

The utility model provides a first switch and second switch collaborative work can keep apart two AC electric wire netting, realize two AC electric wire netting's independent operation, reduce electric wire netting trouble short-circuit current, reduce the influence of trouble electric wire netting to non-trouble electric wire netting to the minimum.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic diagram of a circuit structure of an energy router provided in embodiment 1 of the present application;

fig. 2 is a schematic structural diagram of a first ac-dc conversion unit provided in embodiment 1 of the present application;

fig. 3 is a schematic diagram of a circuit structure of an energy router provided in embodiment 2 of the present application;

fig. 4 is a schematic diagram of a circuit structure of an energy router provided in embodiment 3 of the present application.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, 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 application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Example 1:

as shown in fig. 1-2, embodiment 1 of the present invention provides an energy router, including a shunt transformer 1, a series transformer 2, a first port X1, a second port X2, a first ac/dc conversion unit 3, and a second ac/dc conversion unit 4;

the primary side of the parallel transformer 1 is connected with a first port X1, and the secondary side of the parallel transformer is connected with the alternating current input end of the first alternating current-direct current conversion unit 3; the primary side of the series transformer 2 is connected in series between the first port X1 and the second port X2, the secondary side of the series transformer is connected with the alternating current input end of the second alternating current-direct current conversion unit 4, and the primary side of the series transformer 2 is connected in parallel with a group of bypass switches 21;

the direct current sides of the first alternating current-direct current conversion unit 3 and the second alternating current-direct current conversion unit 4 are connected in parallel and then connected to a third port X3.

Preferably, the first port X1 and the second port X2 are three-phase cross-flow ends.

Preferably, the first ac/dc conversion unit 3 and the second ac/dc conversion unit 4 adopt a three-phase bridge topology.

Example 2:

as shown in fig. 3, the energy router in embodiment 2 further includes, with respect to embodiment 1, a fourth port X4, a fifth port X5, and a load 7, where the fourth port X4 is connected to a third port X3 through the dc conversion unit 5, the third port X3 is connected to the high-voltage input terminal of the dc conversion unit 5, and the low-voltage output terminal of the dc conversion unit 5 is connected to a fourth port X4. The fifth port X5 is connected to a third port X3 through a third ac/dc converting unit 6, the third port X3 is connected to the dc input terminal of the third ac/dc converting unit 6, and the ac output terminal of the third ac/dc converting unit 6 is connected to the fifth port X5; the load 7 is connected to the third port X3.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Example 3:

as shown in fig. 4, the energy router in embodiment 3 further adds a first switch 8 and a second switch 9 to embodiment 2, the first switch 9 is connected in series between the first port X1 and the primary side of the series transformer 2, and the second switch 9 is connected in parallel between the first switch 9 and the primary side of the series transformer 2.

The control method of the energy router comprises the following steps:

detecting a current frequency and a voltage phase at the first port and the second port;

when the current frequency and the voltage phase of the first port and the second port are the same, enabling the first switch to be in an on-position state and the second switch to be in an off-position state;

when the current frequency and the voltage phase of the first port and the second port are different, the first switch is opened first, and then the second switch is closed.

The above description is only exemplary of the invention and is not intended to limit the invention, and any modifications, equivalent alterations, improvements and the like which are made within the spirit and principle of the invention are all included in the scope of the claims which are appended hereto.

Claims

1. An energy router, comprising:

at least one shunt transformer;

at least one series transformer;

the primary side of the parallel transformer is connected with the first port, and the secondary side of the parallel transformer is connected with the alternating current input end of the first alternating current-direct current conversion unit; the primary side of the series transformer is connected between the first port and the second port in series, the secondary side of the series transformer is connected with the alternating current input end of the second alternating current-direct current conversion unit, and the primary side of the series transformer is connected with a bypass switch in parallel;

2. The energy router of claim 1, wherein: the first port and the second port are three-phase cross flow ends.

3. The energy router of claim 1, wherein: the first alternating current-direct current conversion unit and the second alternating current-direct current conversion unit adopt a modular multilevel topological structure or a three-phase bridge topological structure.

4. The energy router of claim 1, wherein: the high-voltage direct current conversion device is characterized by further comprising a fourth port, wherein the fourth port is connected with a third port through a direct current conversion unit, the third port is connected with a high-voltage access end of the direct current conversion unit, and a low-voltage output end of the direct current conversion unit is connected with the fourth port.

5. The energy router of claim 1, wherein: the DC-DC converter further comprises a fifth port, the fifth port is connected with a third port through a third AC-DC conversion unit, the third port is connected with a DC input end of the DC conversion unit, and an AC output end of the third AC-DC conversion unit is connected with the fifth port.

6. The energy router of claim 1, wherein: a load connected to the third port is also included.

7. The energy router of any of claims 1-6, wherein: the transformer further comprises a first switch and a second switch, the first switch is connected between the first port and the primary side of the series transformer in series, and the second switch is connected between the first switch and the primary side of the series transformer in parallel.