CN114285019A - Energy router and converter formed based on interconnection of isolated four-port converters - Google Patents
Energy router and converter formed based on interconnection of isolated four-port converters Download PDFInfo
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Abstract
The invention provides an energy router and a converter formed by interconnection of isolated four-port converters, wherein the energy router comprises a plurality of isolated four-port converters, an annular common bus and an energy storage system, and the isolated four-port converters are connected in series end to end through a first port and a third port to form an annular structure: the second ports of the isolated four-port converters are connected with the annular common bus, the energy storage system is connected with the annular common bus, electric energy exchange can be realized between the energy storage system and the isolated four-port converters, any two adjacent isolated four-port converters and the direct-current bus section of the annular common bus between the second ports of any two adjacent isolated four-port converters form a power distribution subarea, and the direct-current bus section in the power distribution subarea is used for connecting a second load. The technical scheme of the invention is applied to solve the technical problems that in the prior art, too many converters are needed and the interface converter does not have an electrical isolation function.
Description
Technical Field
The invention relates to the technical field of converters, in particular to an energy router and a converter formed by interconnection of isolated four-port converters.
Background
In the prior art, multiple power sources or loads are connected to a common dc bus in a manner of sharing the dc bus through respective power converters, so as to implement transmission and regulation of electric energy. On one hand, a large number of converters exist in the system, and on the other hand, because the adopted interface converter does not have an electrical isolation function, the negative influence of conductive interference on sensitive loads and the like are difficult to eliminate.
Disclosure of Invention
The invention provides an energy router and a converter formed by interconnection of isolated four-port converters, which can solve the technical problems of negative influence of conductive interference on sensitive loads caused by excessive converters and no electrical isolation function of interface converters in the prior art.
According to an aspect of the present invention, there is provided an energy router formed by interconnection of isolated four-port converters, the energy router including a plurality of isolated four-port converters, an annular common bus and an energy storage system, each isolated four-port converter including a first port, a second port, a third port and a fourth port, the plurality of isolated four-port converters being connected in series end to end through the first port and the third port to form an annular structure, the first port of each isolated four-port converter being connected to the third port of an adjacent isolated four-port converter on one side thereof, the third port of each isolated four-port converter being connected to the first port of an adjacent isolated four-port converter on the other side thereof: the second ports of the isolated four-port converters are connected with an annular common bus, the energy storage system is connected with the annular common bus, the energy storage system can realize electric energy exchange with the isolated four-port converters, the fourth ports of the isolated four-port converters are all used for connecting a first load or a power source, a power distribution subarea is formed by the direct current bus sections of the annular common bus between any two adjacent isolated four-port converters and the second ports of any two adjacent isolated four-port converters, the direct current bus sections in the power distribution subarea are used for connecting a second load, and the second load can obtain electric energy from the redundant power or the energy storage system of any two adjacent isolated four-port converters and other isolated four-port converters.
Further, the port voltage v of the second port of any isolated four-port converterpHas a value range of vpmin≤vp≤vpmaxWherein v ispminIs a lower limit value, v, of a preset annular common bus voltage valuepmaxIs the upper limit value of the preset annular common bus voltage value.
Further, the energy router controls the operation mode of two adjacent isolated four-port converters in the power distribution subarea according to the load terminal voltage of any power distribution subarea.
Further, the energy router specifically controls the operation mode of two adjacent isolated four-port converters in the power distribution subarea according to the load terminal voltage of any power distribution subarea, and the operation mode specifically includes: taking a first port of one of two adjacent isolated four-port converters as a main port for load power supply, and taking a first port of the other isolated four-port converter as a slave port for load power supply; the main port continuously supplies power to the second load, the load end voltage of the power distribution partition is detected, and the energy router controls the auxiliary port to be in a current-limiting working mode or a parallel working mode according to the load end voltage.
Further, the energy router specifically includes that the slave port is controlled to be in a current-limiting working mode or a parallel working mode according to the voltage of the load terminal: when the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to carry out current output; when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the master port are in a parallel working mode to supply power to the load together.
Further, the energy router also comprises a bidirectional DC/DC converter, and the energy storage system is connected with the annular common bus through the bidirectional DC/DC converter.
Furthermore, the energy router comprises four isolated four-port converters, each isolated four-port converter comprises a first port, a second port, a third port and a fourth port, the third port of the first isolated four-port converter is connected with the first port of the second isolated four-port converter, the third port of the second isolated four-port converter is connected with the first port of the third isolated four-port converter, the third port of the third isolated four-port converter is connected with the first port of the fourth isolated four-port converter, and the third port of the fourth isolated four-port converter is connected with the first port of the first isolated four-port converter; the second ports of the four isolated four-port converters are connected with the annular common bus, the energy storage system is connected with the annular common bus, the fourth ports of the four isolated four-port converters are used for connecting a load or a power supply, any two adjacent isolated four-port converters and the direct-current bus section of the annular common bus between the second ports of any two adjacent isolated four-port converters form a power distribution subarea, and the direct-current bus sections in the power distribution subarea are used for connecting the load.
According to another aspect of the present invention, an isolated three-port converter is provided, which includes a first power supply, a second power supply, a third power supply, a first FB full-bridge converter, a second FB full-bridge converter, a third FB full-bridge converter, a transformer, a first load and a second load, wherein the transformer includes a primary winding, a first secondary winding and a second secondary winding, the first power supply is connected in parallel with the first FB full-bridge converter and then connected with the primary winding to form an auxiliary power partition, the second power supply, the first load and the second FB full-bridge converter are connected in parallel and then connected with the first secondary winding to form a first load partition, and the third power supply, the second load and the third FB full-bridge converter are connected in parallel and then connected with the second secondary winding to form a second load partition.
Further, when the second power source of the first load partition fails or is not powerful enough to support consumption of the first load, the first power source in the auxiliary power partition and/or the third power source in the second load partition may be used to supply power to the first load; the first power source in the auxiliary power partition and/or the second power source in the first load partition may be used to supply power to the second load when the third power source of the second load partition fails or is not powerful enough to support consumption of the second load.
By applying the technical scheme of the invention, the energy router formed by interconnecting a plurality of isolated four-port converters according to a certain rule and matching with a system-level regulation strategy is provided, the plurality of isolated four-port converters are all connected with an annular common bus, and the energy storage system and the plurality of isolated four-port converters can realize electric energy exchange so as to realize controllable and coordinated flow of electric energy among nodes of each multi-port converter; the single isolated four-port converter is regarded as an electric energy conversion node, and because the ports of the isolated four-port converter are not electrically connected, except that the interconnected ports are in common ground, the rest ports are isolated, the negative influence of conductive interference on a sensitive load can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can be simultaneously connected with and process a plurality of paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among a plurality of ports by control, and can realize controllable and coordinated flow of electric energy among all multi-port converter nodes by interconnecting a plurality of isolated four-port converters according to a certain rule.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram illustrating a topology of an energy router constructed based on isolated four-port converter interconnections according to an embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a power router formed by a single isolated three-port converter provided in accordance with a specific embodiment of the present invention;
fig. 3 illustrates a topology of a single isolated four-port converter and a simplified schematic illustration thereof, provided in accordance with a specific embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. an isolated four-port converter; 11. a first isolated four-port converter; 12. a second isolated four-port converter; 13. a third isolated four-port converter; 14. a fourth isolated four-port converter; 20. an annular common bus; 30. an energy storage system; 40. a bidirectional DC/DC converter; 100. a first power supply; 200. a second power supply; 300. a third power supply; 400. a first FB full bridge converter; 500. a second FB full bridge converter; 600. a third FB full bridge converter; 700. a transformer; 800. a first load; 900. a second load.
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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1, according to a specific embodiment of the present invention, there is provided an energy router formed by interconnection of isolated four-port converters, the energy router including a plurality of isolated four-port converters 10, an annular common bus 20 and an energy storage system 30, each isolated four-port converter 10 including a first port, a second port, a third port and a fourth port, the plurality of isolated four-port converters 10 being connected end to end through the first port and the third port to form a ring structure, the first port of any isolated four-port converter 10 being connected to the third port of an adjacent isolated four-port converter 10 located on one side thereof, the third port of any isolated four-port converter 10 being connected to the first port of an adjacent isolated four-port converter 10 located on the other side thereof: the second ports of the isolated four-port converters 10 are all connected with the annular common bus 20, the energy storage system 30 is connected with the annular common bus 20, the energy storage system 30 can exchange electric energy with the isolated four-port converters 10, the fourth ports of the isolated four-port converters 10 are all used for connecting a first load or a power source, a power distribution subarea is formed by the direct-current bus sections of the annular common bus 20 between the second ports of any two adjacent isolated four-port converters 10 and any two adjacent isolated four-port converters 10, the direct-current bus sections in the power distribution subarea are used for connecting a second load, and the second load can obtain electric energy from the redundant power of any two adjacent isolated four-port converters 10 and other isolated four-port converters 10 or the energy storage system 30.
By applying the configuration mode, an energy router formed by interconnecting a plurality of isolated four-port converters is provided, the energy router interconnects the isolated four-port converters according to a certain rule and is matched with a system-level regulation strategy, the isolated four-port converters are connected with an annular common bus, and electric energy exchange can be realized between an energy storage system and the isolated four-port converters to realize controllable and coordinated flow of electric energy among all multi-port converter nodes; the single isolated four-port converter is regarded as an electric energy conversion node, and because the ports of the isolated four-port converter are not electrically connected, except that the interconnected ports are in common ground, the rest ports are isolated, the negative influence of conductive interference on a sensitive load can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can be simultaneously connected with and process a plurality of paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among a plurality of ports by control, and can realize controllable and coordinated flow of electric energy among all multi-port converter nodes by interconnecting a plurality of isolated four-port converters according to a certain rule.
Specifically, in the present invention, the basic unit of the present invention is an isolated four-active-bridge (QAB), referred to as a four-port converter and its simplified illustration in this patent, as shown in fig. 3. Isolating four-port converter comprising a four-winding high-frequency isolation transformerfrequency transformer, HFT), winding turns ratio N1: n2: n3: n4. Two ends of each winding are respectively connected with the middle points of two bridge arms of each Full Bridge (FB) converter, and the middle point voltage v of each full bridge converter bridge arm is controllediAnd (i is 1, 2, 3 and 4), and the magnitude and the direction of electric energy among the ports are controlled. Isolating the four-port converter itself is a mature technology and will not be described herein.
Further, in the present invention, in order to enable reliable power supply to the load, the energy router controls the operation mode of two adjacent isolated four-port converters 10 in any one of the power distribution bays according to the load terminal voltage of the power distribution bay. The energy router specifically controls the working modes of two adjacent isolated four-port converters 10 in the power distribution subarea according to the load terminal voltage of any power distribution subarea, and the working modes specifically include: taking a first port of one isolated four-port converter 10 of two adjacent isolated four-port converters 10 as a main port for supplying power to a load, and taking a first port of the other isolated four-port converter 10 as a slave port for supplying power to the load; the main port continuously supplies power to the load, the load end voltage of the power distribution partition is detected, and the energy router controls the auxiliary port to be in a current-limiting working mode or a parallel working mode according to the load end voltage.
Specifically, in the present invention, the controlling, by the energy router, the slave port to be in the current-limiting operating mode or the parallel operating mode according to the voltage at the load terminal specifically includes: when the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to carry out current output, and the slave power supply port can provide enough power for the load and does not need to work; when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the master port are in a parallel working mode to supply power to the load together, and at the moment, the load is heavier, the power of the master port is insufficient, and partial power needs to be supplied from the power port.
Further, in the present invention, in order to realize energy exchange between the energy storage system 30 and the plurality of isolated four-port converters, the energy router may be configured to further include a bidirectional DC/DC converter 40, and the energy storage system 30 is connected to the ring-shaped common bus 20 through the bidirectional DC/DC converter 40.
In order to further understand the present invention, a first embodiment of the present invention is described in detail below with reference to fig. 1.
As shown in fig. 1, according to the specific embodiment of the present invention, there is provided an energy router, which includes four isolated four-port converters, each of the isolated four-port converters includes a first port, a second port, a third port and a fourth port, the third port of the first isolated four-port converter 11 is connected to the first port of the second isolated four-port converter 12, the third port of the second isolated four-port converter 12 is connected to the first port of the third isolated four-port converter 13, the third port of the third isolated four-port converter 13 is connected to the first port of the fourth isolated four-port converter 14, and the third port of the fourth isolated four-port converter 14 is connected to the first port of the first isolated four-port converter 11; the second ports of the four isolated four-port converters 10 are all connected with the annular common bus 20, the energy storage system 30 is connected with the annular common bus 20, the fourth ports of the four isolated four-port converters are all used for connecting a first load or a power supply, the direct current bus sections of the annular common bus between any two adjacent isolated four-port converters and the second ports of any two adjacent isolated four-port converters form a power distribution subarea, and the direct current bus sections in the power distribution subarea are used for connecting a second load.
As shown in FIG. 1, the energy router of the present invention includes four isolated three-port converters, respectively denoted QABi(i is 1, 2, 3, 4), and the port of each converter is denoted as Pij(i-1, 2, 3, 4; j-1, 2, 3, 4). The basic principle of interconnection of the QAB converters is as follows: one port of each QAB converter is connected with an annular common direct current bus, the bus is used as a common energy transmission channel, and a common energy storage system can be configured on the annular interconnected direct current bus; each QAB converter can be provided with a special power supply port or energy storage port; as shown in FIG. 1, there are 4 distribution partitions (zones), and the reliability of power supply of each distribution partition is provided by two adjacent QThe AB converters are respectively provided with one port. According to actual needs, one port can be used as a main power supply of a certain power distribution partition under normal conditions, and the other port can be used as a hot standby or standby mode. The power supply circuit can be used as a standby power supply path in the case of failure of one port or insufficient power supply required by a load, or can be used for realizing reconfiguration of the power supply circuit. QAB1P of13Port and QAB2P of21Port connection, QAB2P of23Port and QAB3P of31Port connection, QAB3P of33Port and QAB4P of41Port connection, QAB4P of43Port and QAB1P of11The ports are connected in a QAB relationship1～QAB4The nodes form a ring-shaped power distribution structure, which is called as an inner ring in the patent.
Will QAB1P of12Port, QAB2P of22Port, QAB3P of32Port and QAB4P of42The ports are connected to a common ring DC bus, on which the energy storage system ESS is connected via a bidirectional DC/DC converter. This annular connection is located outside the aforementioned "inner ring", which is referred to in this patent as the "outer ring". The terms "inner ring" and "outer ring" are relative terms, and as other embodiments, the term "outer ring" may be located within the term "inner ring".
QABiP ofi4The (i-1, 2, 3, 4) port is a generalized source-mounted port, and can be accessed to a power supply or a load according to actual needs. As shown in FIG. 1, QAB1P of14Port access power supply PS1, QAB2P of24Port access power supply PS2, QAB3P of34Port access power supply PS3, QAB4P of44The port is connected to a load PS 4. Due to each Pi4The ports are isolated, so PS 1-PS 4 have different isolated power supply ground GND 1-GND 4.
More loads may be placed on the "outer ring" bus. Referring to FIG. 2, the load Z12(A plurality of loads in an actual system are collectively represented by the parameter) is connected to the port P13And port P21On the direct current bus in between, load Z23Is connected to port P23And port P31On the direct current bus in between, load Z34Is connected to port P33And port P41On the direct current bus in between, load Z41Is connected to port P43And port P11On the direct current bus in between. Since there is no electrical connection between the ports of the isolated four-port converter, the ports are isolated except for the interconnect port which is common to ground, and therefore, GND 5-GND 9 shown in fig. 2 all represent isolated load power reference grounds.
Isolating QAB for any one of the systemsi(i-1, 2, 3, 4) inverter, P connecting it to a common dc busi2(i ═ 1, 2, 3, 4) voltage v at portp(i.e. common DC bus voltage) is controlled at vpmin≤vp≤vpmaxRange wherein vpminIs a preset lower limit value v of the voltage value of the annular common bus 20pmaxThe voltage value of the ring-shaped common bus 20 is a preset upper limit value, and the direct current bus voltage value is used as an information interaction variable for realizing electric energy coordination control and keeping the voltage of the common direct current bus stable by each QAB converter of the whole system.
Controlling any one of the isolated QABsi(i-1, 2, 3, 4) converter Pi3(i ═ 1, 2, 3, 4) ports are voltage sources (e.g., P)13) And is used as a main port for supplying power to a load; and P of QAB converter to be adjacent theretoi1And the (i-1, 2, 3 and 4) port is used as a slave power supply port. When the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to carry out current output, and the slave power supply port can provide enough power for the load and does not need to work; when the load end voltage is smaller than the set load end voltage, the slave port and the master port are in a parallel working mode to supply power to the load together, and at the moment, the load is heavier, the power of the master power port is insufficient, and a slave power port providing part is requiredAnd (5) dividing power. By detecting the load terminal voltage of the power distribution partition, the slave power supply port can be controlled to work in a voltage control mode (hot backup mode) of current-limited output (output current is approximately 0), a parallel mode, or an electronic switch can be set for switching under the condition that the system does not require seamless transition. I.e., any QAB converter in the system has a primary power port and a secondary power port that is a duplicate (backup) of the load supply lines.
In the topology shown in fig. 1, through conversion and control, the load in any one power distribution sub-area can obtain electric energy from two adjacent QAB converter power supplies, and can share redundant power of other QAB converters and electric energy stored in the energy storage system through a common direct current bus if necessary. In structural form, the "outer ring" common dc bus of fig. 1 acts like a barrier to protect the inner ring main distribution system. The mechanism is that each QABiThe (i ═ 1, 2, 3 and 4) converters are connected with the direct current bus through one port, and under the condition that the power supply of the converter per se or the adjacent QAB converters is insufficient, the redundant power of other QAB converters can be utilized through the common direct current bus, so that the purposes of improving the reliability and the continuous power supply capacity of the whole power distribution system are achieved.
In the present invention, the energy storage system ESS connected to the "outer ring" common dc bus has mainly three roles: one is to support the voltage of the common direct current bus; secondly, the shared resource can be used as a standby power supply of all QAB converters in the system and supplies the load in any power distribution partition when necessary; and thirdly, the purpose of stabilizing the energy fluctuation in the system is achieved. The ESS energy storage system is connected to a common direct current bus voltage bus through a bidirectional DC/DC converter (the bidirectional DC/DC converter is used for supporting bidirectional electric energy flow, and a unidirectional DC/DC converter can be adopted if only energy storage is required to absorb or release electric energy), so that the ESS terminal voltage, charging current and common direct current bus voltage v are realizedpDecoupling between changes within a certain range simplifies system control. Under normal conditions, the charging can be carried out according to the state of charge (SOC) of the ESS energy storage system through the DC/DC pairThe control of the converter implements a dedicated charging control.
According to another aspect of the present invention, there is provided an isolated three-port converter comprising a first power supply 100, a second power supply 200, a third power supply 300, a first FB full-bridge converter 400, a second FB full-bridge converter 500, a third FB full-bridge converter 600, the transformer 700 comprises a primary winding 701, a first secondary winding 702 and a second secondary winding 703, the first power supply 100 is connected with the primary winding 701 after being connected with the first FB full-bridge converter 400 in parallel to form an auxiliary power supply partition, the second power supply 200, the first load 800 is connected with the first secondary winding 702 after being connected with the second FB full-bridge converter 500 in parallel to form a first load partition, and the third power supply 300, the second load 900 is connected with the second secondary winding 703 after being connected with the third FB full-bridge converter 600 in parallel to form a second load partition.
In this configuration, an isolated three-port converter is provided, which is based on the first embodiment, and only one QAB converter in the system under extreme conditions can be increased or decreased according to actual conditions, at this time, since the common dc bus is no longer present, the QAB converter for isolating four ports can be degraded into an isolated three-port converter, which constitutes the isolated three-port converter in this embodiment, as shown in fig. 2 in particular. In this system, power can flow arbitrarily between two load partitions (partition 2 and partition 3 shown in fig. 2) and an auxiliary power partition (partition 1 shown in fig. 2); the electric energy transmission across voltage classes can be realized; with each distribution partition in hot backup with each other, e.g. if power u in partition 22Fault or insufficient power to support its load Z2Can be determined by u in partition 11Or u in partition 33Or a combination of both to power the loads in partition 2; the power distribution system can have better fault-tolerant performance, and the reliability of power distribution is improved. In addition, the FB full-bridge converters 500 are isolated from each other, so that the negative effect of the conductive interference on the sensitive load can be effectively eliminated.
Specifically, in the present invention, when the second power source 200 of the first load partition fails or is not powerful enough to support the consumption of the first load 800, the first power source 100 in the auxiliary power partition and/or the third power source 300 in the second load partition may be used to supply power to the first load 800; when the third power supply 300 of the second load partition fails or the power is insufficient to support the consumption of the second load 900, the first power supply 100 in the auxiliary power partition and/or the second power supply 200 in the first load partition may be used to supply power to the second load 900.
In summary, the invention provides an energy router formed by interconnection of isolated four-port converters, the energy router interconnects a plurality of isolated four-port converters according to a certain rule, and cooperates with a system-level regulation strategy, the plurality of isolated four-port converters are all connected with an annular common bus, and electric energy exchange can be realized between an energy storage system and the plurality of isolated four-port converters, so as to realize controllable and coordinated flow of electric energy between each multi-port converter node, thereby reducing the number of converters, and achieving the purposes of improving the reliability, fault tolerance and continuous power supply capability of the whole power distribution system while realizing flexible electric energy regulation and cross-voltage level transmission; the single isolated four-port converter is regarded as an electric energy conversion node, and because the ports of the isolated four-port converter are not electrically connected, except that the interconnected ports are in common ground, the rest ports are isolated, the negative influence of conductive interference on a sensitive load can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can be simultaneously connected with and process a plurality of paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among a plurality of ports by control, and can realize controllable and coordinated flow of electric energy among all multi-port converter nodes by interconnecting a plurality of isolated four-port converters according to a certain rule.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
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.
Claims (9)
1. An energy router formed based on interconnection of isolated four-port converters, the energy router comprising a plurality of isolated four-port converters (10), an annular common bus (20) and an energy storage system (30), wherein any of the isolated four-port converters (10) comprises a first port, a second port, a third port and a fourth port, the isolated four-port converters (10) are connected end to end through the first port and the third port to form an annular structure, the first port of any of the isolated four-port converters (10) is connected with the third port of an adjacent isolated four-port converter (10) located on one side thereof, and the third port of any of the isolated four-port converters (10) is connected with the first port of an adjacent isolated four-port converter (10) located on the other side thereof: the second ports of a plurality of said isolated four port converters (10) are each connected to said ring-shaped common bus (20), the energy storage system (30) is connected with the annular common bus (20), electric energy exchange can be realized between the energy storage system (30) and the isolated four-port converters (10), fourth ports of the isolated four-port converters (10) are all used for being connected with a first load or a power supply, a direct current bus section of the annular common bus (20) between the second ports of any two adjacent isolated four-port converters (10) and any two adjacent isolated four-port converters (10) forms a power distribution sub-area, the DC bus sections in the power distribution sub-areas are used for connecting second loads, and the second loads can obtain electric energy from redundant power of any two adjacent isolated four-port converters (10) and other isolated four-port converters (10) or the energy storage system (30).
2. The energy router formed by interconnection of isolated four-port converters according to claim 1, wherein the port voltage v of the second port of any one of the isolated four-port converters (10)pHas a value range of vpmin≤vp≤vpmaxWherein v ispminIs a preset lower limit value v of the voltage value of the annular common bus (20)pmaxIs the upper limit value of the preset voltage value of the annular common bus (20).
3. The isolated four-port converter interconnection-based energy router of claim 1, wherein the energy router controls the operating mode of two isolated four-port converters (10) adjacent to each of the power distribution bays according to the load terminal voltage of any one of the power distribution bays.
4. The energy router formed by interconnection of isolated four-port converters according to claim 3, wherein the energy router controls the operation mode of two adjacent isolated four-port converters (10) in the power distribution subareas according to the load terminal voltage of any one of the power distribution subareas, and specifically comprises:
taking the first port of one of the two adjacent isolated four-port converters (10) as a main port for supplying power to a load, and taking the first port of the other isolated four-port converter (10) as a slave port for supplying power to the load;
and the master port continuously supplies power to a second load, the load end voltage of the power distribution partition is detected, and the energy router controls the slave port to be in a current-limiting working mode or a parallel working mode according to the load end voltage.
5. The energy router formed by interconnection of the isolated four-port converters according to claim 4, wherein the step of controlling the slave port to be in the current-limiting operation mode or the parallel operation mode according to the voltage at the load end by the energy router specifically comprises the steps of: when the load terminal voltage is greater than or equal to a set load terminal voltage, the slave port is limited to carry out current output; when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the master port are in a parallel working mode to supply power to the load together.
6. The isolated four-port converter interconnection-based energy router according to claim 1, further comprising a bidirectional DC/DC converter (40), wherein the energy storage system (30) is connected with the ring-shaped common bus (20) through the bidirectional DC/DC converter (40).
7. The isolated four-port transformer interconnection-based energy router of claim 1, characterized in that the energy router comprises four isolated four-port converters, any one of the isolated four-port converters comprises a first port, a second port, a third port and a fourth port, the third port of the first isolated four-port converter (11) is connected with the first port of the second isolated four-port converter (12), the third port of the second isolated four-port converter (12) is connected with the first port of a third isolated four-port converter (13), the third port of the third isolated four-port converter (13) is connected with the first port of a fourth isolated four-port converter (14), a third port of the fourth isolated four-port converter (14) is connected with a first port of the first isolated four-port converter (11); four the second port of isolating four port converter (10) all with annular common bus (20) are connected, energy storage system (30) with annular common bus (20) are connected, four the fourth port of isolating four port converter all is used for connecting load or power, and the direct current bus section of the annular common bus between the second port of arbitrary two adjacent isolation four port converter and arbitrary two adjacent isolation four port converter forms a distribution subregion, direct current bus section in the distribution subregion is used for connecting load.
8. An isolated three-port converter is characterized by comprising a first power supply (100), a second power supply (200), a third power supply (300), a first FB full-bridge converter (400), a second FB full-bridge converter (500), a third FB full-bridge converter (600), a transformer (700), a first load (800) and a second load (900), wherein the transformer (700) comprises a primary winding (701), a first secondary winding (702) and a second secondary winding (703), the first power supply (100) is connected with the primary winding (701) after being connected with the first FB full-bridge converter (400) in parallel to form an auxiliary power supply partition, the second power supply (200), the first load (800) is connected with the second FB full-bridge converter (500) in parallel to form a first load partition by being connected with the first secondary winding (702), the third power supply (300), the second load (900) and the third FB full-bridge converter (600) are connected in parallel and then connected with the second secondary winding (703) to form a second load partition.
9. The isolated three-port converter according to claim 8, wherein a first power source (100) in the auxiliary power partition and/or a third power source (300) in the second load partition is available to supply power to the first load (800) when a second power source (200) of the first load partition fails or is not powerful enough to support consumption of the first load (800); the first power source (100) in the auxiliary power partition and/or the second power source (200) in the first load partition may be used to power the second load (900) when the third power source (300) of the second load partition fails or is not powerful enough to support consumption of the second load (900).
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