CN114285019B - Energy router and converter based on interconnection of isolated four-port converters - Google Patents
Energy router and converter based on interconnection of isolated four-port converters Download PDFInfo
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Abstract
The application provides an energy router and an energy converter based on interconnection of isolated four-port converters, wherein the energy router comprises a plurality of isolated four-port converters, an annular public 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 plurality of 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 plurality of isolated four-port converters, 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 partition, and the direct current bus sections in the power distribution partition are used for connecting a second load. The technical scheme of the application is applied to solve the technical problems that in the prior art, the number of converters is too large and the interface converter does not have an electrical isolation function.
Description
Technical Field
The application relates to the technical field of converters, in particular to an energy router and a converter based on interconnection of isolated four-port converters.
Background
In the prior art, multiple paths of power supplies or loads are connected to a common direct current bus through respective power converters in a common direct current bus mode, so that electric energy transmission and regulation are realized. On the one hand, a large number of converters exist in the system, and on the other hand, the adopted interface converters have no electric isolation function, so that the negative influence of conductive interference on sensitive loads and the like are difficult to eliminate.
Disclosure of Invention
The application provides an energy router and an energy converter based on interconnection of isolated four-port converters, which can solve the technical problem that in the prior art, the converters are too many and an interface converter does not have an electrical isolation function, so that the conductive interference has negative influence on a sensitive load.
According to an aspect of the present application, there is provided an energy router formed by interconnecting isolated four-port converters, the energy router including a plurality of isolated four-port converters, a ring-shaped common bus and an energy storage system, any one of the isolated four-port converters including a first port, a second port, a third port and a fourth port, the plurality of isolated four-port converters being connected end to end in series through the first port and the third port to form a ring-shaped structure, the first port of any one of the isolated four-port converters being connected with the third port of an adjacent isolated four-port converter located on one side thereof, the third port of any one of the isolated four-port converters being connected with the first port of an adjacent isolated four-port converter located on the other side thereof: the second ports of the plurality of isolated four-port converters are all connected with the annular public bus, the energy storage system is connected with the annular public bus, electric energy exchange can be realized between the energy storage system and the plurality of isolated four-port converters, the fourth ports of the plurality of isolated four-port converters are all used for connecting a first load or a power supply, a power distribution partition is formed by the DC bus segments of the annular public bus between any two adjacent isolated four-port converters and the second ports of any two adjacent isolated four-port converters, and the DC bus segments in the power distribution partition are used for connecting a second load which can acquire 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 converter p The value range of (2) is v pmin ≤v p ≤v pmax Wherein v is pmin V is the lower limit value of the preset annular public bus voltage value pmax Is the upper limit value of the preset annular public bus voltage value.
Further, the energy router controls the operation mode of two adjacent isolated four-port converters in the distribution partition according to the load terminal voltage of any distribution partition.
Further, the energy router controls the working modes of two adjacent isolated four-port converters in any power distribution partition according to the load end voltage of the power distribution partition, and specifically comprises the following steps: the method comprises the steps that a first port of one of two adjacent isolated four-port converters is used as a main port for supplying power to a load, and a first port of the other isolated four-port converter is used as a slave port for supplying power to the load; 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 controls the slave port to be in a current-limiting working mode or a parallel working mode according to the voltage of the load terminal specifically comprises: when the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to output current; when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the master port are in a parallel operation mode to jointly supply power to the load.
Further, the energy router also comprises a bidirectional DC/DC converter, and the energy storage system is connected with the annular public bus through the bidirectional DC/DC converter.
Further, the energy router comprises four isolated four-port converters, each of which 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-port isolating converters are connected with the annular public bus, the energy storage system is connected with the annular public bus, the fourth ports of the four-port isolating converters are used for connecting loads or power supplies, the direct current bus sections of the annular public bus between any two adjacent four-port isolating converters and the second ports of any two adjacent four-port isolating converters form a power distribution partition, and the direct current bus sections in the power distribution partition are used for connecting loads.
According to still another aspect of the present application, there is provided an isolated three-port converter including 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, the transformer including a primary winding, a first secondary winding, and a second secondary winding, the first power supply being connected in parallel with the first FB full-bridge converter and then connected with the primary winding to form an auxiliary power supply section, the second power supply, the first load being connected in parallel with the second FB full-bridge converter and then connected with the first secondary winding to form a first load section, the third power supply, the second load being connected in parallel with the third FB full-bridge converter and then connected with the second secondary winding to form a second load section.
Further, when the second power supply of the first load partition fails or the power is insufficient to support consumption of the first load, the first power supply in the auxiliary power supply partition and/or the third power supply in the second load partition may be used to supply power to the first load; the first power source in the auxiliary power source partition and/or the second power source in the first load partition may be used to power the second load when the third power source of the second load partition fails or is not sufficiently powered to support consumption of the second load.
By adopting the technical scheme, the application provides an energy router formed by interconnecting the isolated four-port converters, wherein the energy router is used for realizing controllable and coordinated flow of electric energy among the nodes of each multi-port converter by interconnecting the isolated four-port converters according to a certain rule and matching with a system level regulation strategy, and realizing the purposes of improving the reliability, fault tolerance and continuous power supply capacity of the whole power distribution system while realizing flexible regulation and cross-voltage grade transmission of the electric energy by connecting the isolated four-port converters with an annular public bus and realizing electric energy exchange between an energy storage system and the isolated four-port converters; the single isolated four-port converter is regarded as an electric energy conversion node, and all ports of the isolated four-port converter are not electrically connected, except that the interconnection ports are grounded, the other ports are isolated, so that the negative influence of conductive interference on sensitive loads can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can simultaneously access and process multiple paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among multiple ports through control, and can realize controllable and coordinated flow of electric energy among various multi-port converter nodes through interconnecting the multiple isolated four-port converters according to a certain rule.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 illustrates a topology diagram of an energy router based on isolated four-port converter interconnections provided in accordance with a specific embodiment of the present application;
FIG. 2 illustrates a schematic diagram of a power router constructed of a single isolated three-port converter provided in accordance with a specific embodiment of the present application;
fig. 3 shows a topology of a single isolated four-port converter and a simplified schematic diagram thereof, provided in accordance with a specific embodiment of the present application.
Wherein the above figures include the following reference numerals:
10. isolating the 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. and a second load.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1, according to an embodiment of the present application, there is provided an energy router formed based on interconnection of isolated four-port converters, the energy router including a plurality of isolated four-port converters 10, a ring-shaped common bus 20 and an energy storage system 30, any one of the isolated four-port converters 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 in series through the first port and the third port to form a ring-shaped structure, the first port of any one of the isolated four-port converters 10 being connected with the third port of an adjacent isolated four-port converter 10 located at one side thereof, the third port of any one of the isolated four-port converters 10 being connected with the first port of an adjacent isolated four-port converter 10 located at the other side thereof: the second ports of the plurality of 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, electric energy exchange can be achieved between the energy storage system 30 and the plurality of isolated four-port converters 10, the fourth ports of the plurality of isolated four-port converters 10 are all used for connecting a first load or a power supply, the direct current bus sections of the annular common bus 20 between any two adjacent isolated four-port converters 10 and the second ports of any two adjacent isolated four-port converters 10 form a power distribution partition, the direct current bus sections in the power distribution partition are used for connecting a second load, and the second load can acquire electric energy from the redundant power of any two adjacent isolated four-port converters 10, other isolated four-port converters 10 or the energy storage system 30.
By adopting the configuration mode, the energy router is formed by interconnecting a plurality of isolated four-port converters according to a certain rule and matching with a system level regulation strategy, and the energy storage system and the plurality of isolated four-port converters can realize electric energy exchange to realize controllable and coordinated flow of electric energy among the nodes of each multi-port converter, so that the quantity of the converters is reduced, and the purposes of improving the reliability, fault tolerance and continuous power supply capacity of the whole power distribution system are achieved while flexible regulation and cross-voltage grade transmission of the electric energy are realized; the single isolated four-port converter is regarded as an electric energy conversion node, and all ports of the isolated four-port converter are not electrically connected, except that the interconnection ports are grounded, the other ports are isolated, so that the negative influence of conductive interference on sensitive loads can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can simultaneously access and process multiple paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among multiple ports through control, and can realize controllable and coordinated flow of electric energy among various multi-port converter nodes through interconnecting the multiple isolated four-port converters according to a certain rule.
Specifically, in the present application, the basic unit of the present application is an isolated four-active-bridge (QAB) converter, abbreviated as four-port converter and its simplified illustration in this patent, as shown in fig. 3. The isolated four-port converter comprises a four-winding high frequency isolation transformer (high frequency transformer, HFT) with a winding turn ratio of N1: n2: and N3: and N4. The two ends of each winding are respectively connected with the midpoints of two bridge arms of the respective Full Bridge (FB) converter by controlling the midpoint voltage v of the bridge arm of the respective full bridge converter i The magnitude of the phase angle between (i=1, 2,3, 4) achieves control over the magnitude and direction of the electrical energy between the ports. The isolated four-port converter itself is a relatively mature technology and will not be described in detail herein.
Further, in the present application, to enable reliable power supply to the load, the energy router controls the mode of operation of two isolated four-port converters 10 adjacent in any distribution partition according to the load-side voltage of that partition. The working modes of the energy router according to the load terminal voltage control of any distribution partition and two adjacent isolated four-port converters 10 in the distribution partition specifically include: 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; 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 application, the energy router is controlled to be in a current-limiting operation mode or a parallel operation mode according to the load terminal voltage, and specifically includes: when the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to output current, and the slave port does not need to work, wherein the slave port can provide enough power for the load; when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the main port are in a parallel working mode to supply power to the load together, the load is heavy, the power of the main power port is insufficient, and partial power needs to be supplied from the power port.
Further, in the present application, to enable 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 bi-directional DC/DC converter 40, through which the energy storage system 30 is connected to the ring common bus 20.
For a further understanding of the present application, a first embodiment of the present application will be described in detail with reference to fig. 1.
As shown in fig. 1, according to an embodiment of the present application, there is provided an energy router including four isolated four-port converters, any of which 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 being connected to the first port of the second isolated four-port converter 12, the third port of the second isolated four-port converter 12 being connected to the first port of the third isolated four-port converter 13, the third port of the third isolated four-port converter 13 being connected to the first port of the fourth isolated four-port converter 14, the third port of the fourth isolated four-port converter 14 being 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 partition, and the direct current bus sections in the power distribution partition are used for connecting a second load.
As shown in fig. 1, the energy router of the present application includes four isolated three-port converters, each labeled QAB i (i=1, 2,3, 4), and the ports of each converter are denoted as P respectively ij (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 public direct current bus, the bus is used as a shared energy transmission channel, and a public energy storage system can be configured on the annular interconnection direct current bus; each QAB converter can be provided with a special power port or energy storage port; as shown in fig. 1, there are 4 distribution partitions (Zone), and the reliability of power supply of each distribution partition is ensured by one port of each of two adjacent QAB converters. According to actual needs, one of the ports can be normally used as a main power supply of a certain power distribution partition, and the other port can be used as a hot standby mode or a standby mode. In the event of a port failure or insufficient power supply to the load, this can be used as a backup power supply path or to reconstruct the power supply line. QAB (quick action) 1 P of (2) 13 Port and QAB 2 P of (2) 21 Ports are connected with QAB 2 P of (2) 23 Port and QAB 3 P of (2) 31 Ports are connected with QAB 3 P of (2) 33 Port and QAB 4 P of (2) 41 Ports are connected with QAB 4 P of (2) 43 Port and QAB 1 P of (2) 11 Ports are connected, and the connection relation is QAB 1 ～QAB 4 For the node, form a circular distribution structure, in this patentReferred to as an "inner ring".
Will QAB 1 P of (2) 12 Port, QAB 2 P of (2) 22 Port, QAB 3 P of (2) 32 Port and QAB 4 P of (2) 42 The ports are connected to a common ring DC bus and to the ESS via a bi-directional DC/DC converter. This annular connection is located outside of the aforementioned "inner ring", which is referred to in this patent as the "outer ring". The terms "inner ring" and "outer ring" are used herein in a relative sense, and as other embodiments, the term "outer ring" may be used herein in the term "inner ring".
QAB i P of (2) i4 The (i=1, 2,3, 4) ports are generalized source load ports, and can be connected with a power supply or a load according to actual needs. As shown in FIG. 1, QAB 1 P of (2) 14 The port is connected with a power supply PS1 and QAB 2 P of (2) 24 The port is connected with a power supply PS2 and QAB 3 P of (2) 34 The port is connected with a power supply PS3 and QAB 4 P of (2) 44 The port accesses the load PS4. Due to each P i4 The ports are isolated, so PS 1-PS 4 have different isolated power supply references GND 1-GND 4.
More load may be placed on the "outer ring" bus. Referring to FIG. 2, a load Z 12 (multiple loads in actual System are represented by the parameter set) are connected to port P 13 And port P 21 On the direct current bus between the two, the load Z 23 Connected to port P 23 And port P 31 On the direct current bus between the two, the load Z 34 Connected to port P 33 And port P 41 On the direct current bus between the two, the load Z 41 Connected to port P 43 And port P 11 And the direct current bus is arranged between the two. Since the isolated four-port converter has no electrical connection between the ports, and the other ports are isolated except for the interconnection port which is common to ground, GND5 to GND9 as shown in fig. 2 represent isolated load power supply references.
Isolating QABs for any one of the systems i (i=1, 2,3, 4) converters, which are coupled to a common dcP of flow bus connection i2 Voltage v of (i=1, 2,3, 4) port p (namely, the common direct current bus voltage) is controlled at v pmin ≤v p ≤v pmax Range where v pmin V is the lower limit value of the preset voltage value of the annular public bus 20 pmax The voltage value of the direct current bus is used as an information interaction variable for realizing electric energy coordination control and keeping the voltage stability of the public direct current bus for each QAB converter of the whole system.
Controlling any one of the isolated QABs i P of (i=1, 2,3, 4) converter i3 The (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; while the P of the QAB converter adjacent thereto i1 The (i=1, 2,3, 4) ports serve as slave power ports. When the load terminal voltage is greater than or equal to the set load terminal voltage, the slave port is limited to output current, and the slave port does not need to work, wherein the slave port can provide enough power for the load; 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 and supply power to the load together, the load is heavy, the power of the master power port is insufficient, and partial power needs to be supplied from the power port. By detecting the load side voltage of the distribution partition, the slave power port can be controlled to operate in a voltage control mode (hot standby mode) with a current limited output (output current approximately 0), a parallel mode, or an electronic switch can be set to switch without requiring seamless switching of the system. That is, any QAB converter in the system has a master power port and a slave power port that is a load power line reconfiguration (backup).
In the topology shown in fig. 1, by conversion and control, the load in any one distribution partition can obtain electric energy from two adjacent QAB converter power sources, and if necessary, can share the redundant power of other QAB converters and the electric energy stored by the energy storage system through the common dc bus. In structural form, the "outer ring" common dc bus in fig. 1 resembles a screenThe barrier forms a protection for the inner loop main power distribution system. The mechanism is that each QAB i The (i=1, 2,3, 4) converters are all connected with the direct current bus through one port, and under the condition that the power supply power of the self or adjacent QAB converters is insufficient, the redundant power of other QAB converters can be utilized through the public 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 application, the ESS of the energy storage system connected to the "outer ring" common dc bus has mainly three roles: the purpose of supporting the voltage of the public direct current bus is achieved; secondly, the system can be used as a shared resource and can be used as a standby power supply of all QAB converters in the system, and the standby power supply can be used for supplying loads in any distribution partition when necessary; thirdly, the purpose of stabilizing energy fluctuation in the system is achieved. The ESS energy storage system is connected to the common DC bus voltage bus by a bidirectional DC/DC converter (the bidirectional DC/DC converter is used for supporting the bidirectional flow of electric energy, and a unidirectional DC/DC converter can be adopted if only energy storage is needed for absorbing or releasing the electric energy), thereby realizing the voltage of the ESS terminal, the charging current and the voltage v of the common DC bus p Decoupling between changes over a range simplifies system control. A dedicated charge control may be normally implemented by controlling the DC/DC converter according to a state of charge (SOC) of the ESS energy storage system.
According to another aspect of the present application, there is provided an isolated three-port converter including 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, the transformer 700 including a primary winding 701, a first secondary winding 702, and a second secondary winding 703, the first power supply 100 being connected in parallel with the first FB full-bridge converter 400 and then connected with the primary winding 701 to form an auxiliary power supply section, the second power supply 200, the first load 800 being connected in parallel with the second FB full-bridge converter 500 and then connected with the first secondary winding 702 to form a first load section, and the third power supply 300, the second load 900 being connected in parallel with the third FB full-bridge converter 600 and then connected with the secondary winding 703 to form a second load section.
In this configuration, an isolated three-port converter is provided, and the number of the isolated four-port converters can be increased or decreased according to the actual situation, and only one QAB converter is provided in the system under the extreme situation, where the isolated four-port QAB converter can be degraded into an isolated three-port converter because the common dc bus is no longer present, so as to form the isolated three-port converter in this embodiment, as shown in fig. 2. In this system, power can flow arbitrarily between two load partitions (partition 2 and partition 3 as shown in fig. 2) and an auxiliary power partition (partition 1 as shown in fig. 2); the transmission of electric energy across voltage classes can be realized; each distribution partition is hot-backed up with respect to the other, e.g. if power supply u in partition 2 2 Failure or insufficient power to support its load Z 2 Then the consumption of (1) can be determined by u in partition 1 1 Or u in partition 3 3 Or a combination of both, to power the loads in partition 2; the power distribution system has better fault tolerance performance, so that the reliability of power distribution is improved. In addition, the FB full-bridge converters 500 are isolated from each other, so that the negative influence of the conductive interference on the sensitive load can be effectively eliminated.
Specifically, in the present application, when the second power supply 200 of the first load partition fails or the power is insufficient to support the consumption of the first load 800, the first power supply 100 in the auxiliary power supply partition and/or the third power supply 300 in the second load partition may be used to supply power to the first load 800; the first power source 100 in the auxiliary power source partition and/or the second power source 200 in the first load partition may be used to supply power to the second load 900 when the third power source 300 of the second load partition fails or is not sufficiently powered to support consumption of the second load 900.
In summary, the application provides an 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, and the energy router realizes controllable and coordinated flow of electric energy among nodes of each multi-port converter by connecting the plurality of isolated four-port converters with an annular public bus and realizing electric energy exchange between an energy storage system and the plurality of isolated four-port converters, so that the quantity of converters is reduced, and the purposes of improving the reliability, fault tolerance and continuous power supply capacity of the whole power distribution system are achieved while flexible regulation and cross-voltage grade transmission of the electric energy are realized; the single isolated four-port converter is regarded as an electric energy conversion node, and all ports of the isolated four-port converter are not electrically connected, except that the interconnection ports are grounded, the other ports are isolated, so that the negative influence of conductive interference on sensitive loads can be effectively eliminated; furthermore, the isolated four-port converter can realize efficient electric energy conversion, has a compact topological structure, can simultaneously access and process multiple paths of power supplies and loads with different voltage levels, can realize arbitrary and flexible transmission of electric energy among multiple ports through control, and can realize controllable and coordinated flow of electric energy among various multi-port converter nodes through interconnecting the multiple isolated four-port converters according to a certain rule.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative 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 in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. An energy router formed by interconnection of isolated four-port converters is characterized by comprising a plurality of isolated four-port converters (10), an annular public bus (20) and an energy storage system (30), wherein any isolated four-port converter (10) comprises a first port, a second port, a third port and a fourth port, the isolated four-port converters (10) are connected in series end to end through the first port and the third port to form an annular structure, the first port of any isolated four-port converter (10) is connected with the third port of an adjacent isolated four-port converter (10) positioned on one side of the isolated four-port converter, and the third port of any isolated four-port converter (10) is connected with the first port of an adjacent isolated four-port converter (10) positioned on the other side of the isolated four-port converter: the second ports of the isolated four-port converters (10) are connected with the annular public bus (20), the energy storage system (30) is connected with the annular public bus (20), electric energy exchange can be achieved between the energy storage system (30) and the isolated four-port converters (10), the fourth ports of the isolated four-port converters (10) are used for being connected with a first load or a power supply, a power distribution partition is formed by the direct current bus sections of the annular public bus (20) between any two adjacent isolated four-port converters (10) and the second ports of any two adjacent isolated four-port converters (10), the direct current bus sections in the power distribution partition are used for being connected with a second load, and the second load can obtain redundant power of any two adjacent isolated four-port converters (10), other isolated four-port converters (10) or electric energy from the energy storage system (30).
2. The energy router based on isolated four-port converter interconnection according to claim 1, characterized in that the port voltage v of the second port of any one of the isolated four-port converters (10) p The value range of (2) is v pmin ≤v p ≤v pmax Wherein v is pmin Is the preset lower limit value, v, of the voltage value of the annular public bus (20) pmax Is the preset upper limit value of the voltage value of the annular public bus (20).
3. The energy router of claim 1, wherein the energy router controls the mode of operation of two adjacent isolated four-port converters (10) in any one of the distribution partitions based on the load side voltage of the distribution partition.
4. An energy router based on 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 any one of the distribution partitions according to the load terminal voltage of the distribution partition, specifically comprising:
taking a 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 a first port of the other isolated four-port converter (10) as a secondary port for supplying power to the load;
and the master 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 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 based on isolated four-port converter interconnection according to claim 4, wherein the energy router controls the slave port to be in a current limiting operation mode or a parallel operation mode according to the load terminal voltage, specifically comprising: when the load terminal voltage is greater than or equal to a set load terminal voltage, the slave port is limited to output current; and when the load terminal voltage is smaller than the set load terminal voltage, the slave port and the master port are in a parallel connection working mode so as to supply power to the load together.
6. The energy router of claim 1, further comprising a bi-directional DC/DC converter (40), wherein the energy storage system (30) is connected to the ring common bus (20) via the bi-directional DC/DC converter (40).
7. The energy router formed by interconnection of isolated four-port converters according to claim 1, wherein the energy router comprises four isolated four-port converters, any one of which 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 the third isolated four-port converter (13), the third port of the third isolated four-port converter (13) is connected with 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 with the first port of the first isolated four-port converter (11); the second ports of the four isolated four-port converters (10) are connected with the annular public bus (20), the energy storage system (30) is connected with the annular public bus (20), the fourth ports of the four isolated four-port converters are used for connecting loads or power supplies, the direct current bus sections of the annular public 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 partition, and the direct current bus sections in the power distribution partition are used for connecting loads.
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