CN115579969A - Energy router topological structure based on flexible interconnection and control method thereof - Google Patents

Energy router topological structure based on flexible interconnection and control method thereof Download PDF

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Publication number
CN115579969A
CN115579969A CN202210982096.0A CN202210982096A CN115579969A CN 115579969 A CN115579969 A CN 115579969A CN 202210982096 A CN202210982096 A CN 202210982096A CN 115579969 A CN115579969 A CN 115579969A
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China
Prior art keywords
power
direct current
alternating current
port unit
voltage
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Pending
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CN202210982096.0A
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Chinese (zh)
Inventor
胡亚山
张群
李妍
王青山
汪德成
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Priority to CN202210982096.0A priority Critical patent/CN115579969A/en
Publication of CN115579969A publication Critical patent/CN115579969A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

Abstract

The invention discloses an energy router topological structure based on flexible interconnection and a control method thereof, the structure has a tidal current bidirectional accurate linear control function, can realize interconnection operation among different voltage networks, can also operate in a voltage source or current source mode, has flexible and changeable control means, is convenient for flexible access of different types of energy sources or loads, has a bidirectional direct current fault isolation protection function in the network, reduces the number of direct current circuit breakers configured in a line, and can also reduce the system cost.

Description

Energy router topological structure based on flexible interconnection and control method thereof
Technical Field
The invention belongs to the technical field of comprehensive energy conversion devices and control, and particularly relates to an energy router topology based on flexible interconnection and a control method thereof.
Background
The energy comprehensive service station is a new mode of utilizing transformer substation resources to construct, operate, charge and transform (energy storage) stations and data center stations, relies on the advantages of the transformer substation close to users, wide coverage, power guarantee and the like, provides IT infrastructure resources for realizing physical world and digital world connection for the power Internet of things by meeting the service requirements of users on power, computing power, storage, connection and the like nearby, and meets the construction requirements of multi-access edge computing stations in 5G network construction. The multi-station integration is a typical application scene of a comprehensive energy service station, the existing transformer substation is utilized to deeply mine resource value, facilities such as an operation charging station, an energy storage station, a communication base station and a data center station are built, and one-station service meets diversified service requirements of devices such as the transformer substation, the energy storage station and the data center station. In the scene, important consideration is to analyze the power supply modes of direct current loads such as a transformer substation, a data center station, a charging and swapping power station, a distributed power supply and a charging pile, and a more efficient and complementary power utilization topological structure is designed, so that the operation energy efficiency level of the whole station is improved. Meanwhile, in the face of the requirement of flexible access of various energy sources, novel multi-port power router equipment needs to be researched, the power supply requirements of various types such as a large number of distributed energy storage equipment, novel loads and renewable energy source equipment for access in the station are met, flexible access of various types of energy sources is realized, and the construction of a comprehensive energy source service station is supported better.
The energy router can realize interconnection among different energy units, and the main components of the energy router comprise a high-frequency transformer, a power switch device and passive element equipment. The power router can solve the problem that the transformation ratio of the traditional transformer is adjustable in a wide range, and has multiple functions of controlling power flow direction, adjusting power quality, flexibly isolating faults, accessing various charge loads and the like. At present, different scholars worldwide develop different kinds of power router prototypes, for example, 1MVA solid-state transformer prototypes proposed and developed by zurich University of switzerland, a new generation solid-state transformer developed by High Point University research center in the united states, and an electric energy exchanger prototype proposed and developed by the institute of electrical power science in china. The topology type of the power router can be classified in different ways: dividing the bus into a common direct current bus type and a common alternating current bus type according to an internal bus coupling form; the voltage characteristics can be divided into single voltage grade and multi-voltage grade; the direct current power grid can be divided into a radial direct current power grid and a mesh direct current power grid according to a wiring mode. However, in the current research, all multiport power routers are radial direct current systems with single voltage level, and the advantages of various direct current electric equipment cannot be fully integrated, so that different voltage level interfaces, wiring modes and system structures need to be adopted according to local conditions, and the potential of a direct current power supply network in a transformer substation is maximized.
To sum up, the existing power router structure is less concerned about port interconnection of different voltage types, less concerned about internal topology optimization, and does not have a seamless switching function between different working conditions.
Disclosure of Invention
In view of this, one of the purposes of the present invention is to provide an energy router topology structure based on flexible interconnection, which has a bidirectional and accurate linear control function of power flow, and facilitates flexible access of various types of energy sources or loads.
The purpose of the invention is realized by the following technical scheme:
an energy router topological structure based on flexible interconnection comprises an alternating current port unit, a direct current port unit and a direct current bus; the alternating current port unit and the direct current port unit are respectively connected to two sides of the direct current bus;
one end of the alternating current port unit is electrically connected with the direct current bus, and the other end of the alternating current port unit is electrically connected with an external alternating current line; the direct current port unit is electrically connected with the direct current bus;
the alternating current port unit adopts a bidirectional alternating current port structure, provides stable voltage for a direct current bus under the condition of grid connection, and provides bidirectional power loop to absorb transmission power of a post-stage circuit or supplement release power of the direct current circuit;
and the direct current port unit controls the voltage, current or power value at two ends of the output side according to the requirement, and is used for changing the power flow distribution in the line through the equivalent impedance in the line.
Furthermore, a fully-controlled power device is adopted in the alternating current port unit.
Further, the ac port unit further includes a power conversion module for converting the dc power into ac power.
Further, the alternating current port unit adopts a bidirectional alternating current converter structure, and the specific circuit topology can be a three-phase full-bridge circuit or a three-phase half-bridge circuit.
Further, the topology structure of the dc port unit may be an H-bridge topology, a buck circuit or a boost circuit, or a combination of a plurality of half-bridge circuits.
The second purpose of the present invention is to provide a topology control method for controlling a topology structure of an energy router based on flexible interconnection, and the purpose is achieved by the following technical solutions:
the control method comprises the following steps:
when the power router works in an alternating current grid-connected working mode, an alternating current port unit is connected to a high-voltage direct current power grid of a commercial power grid to transmit to a low-voltage direct current power grid, a power conversion module of the alternating current port unit works in a power mode control mode with a power factor of 1, a direct current side of the alternating current port unit works in a direct current voltage control mode, when load power on a direct current bus Vm fluctuates, direct current voltage on the direct current side of the alternating current port unit is dynamically adjusted, power input on the alternating current side of the alternating current port unit is changed, and power output of the direct current side voltage of the alternating current port unit is adaptively adjusted through direct current feedforward control and direct current voltage control;
when the electric power router works in a power exchange mode and energy is transmitted from the direct current port unit to the alternating current power grid, the alternating current port works in a direct current voltage control mode, and the alternating current side of the alternating current port unit works in an alternating current power control mode; and when the output power of the alternating current power grid fluctuates, the direct current port on the direct current bus side of the direct current port unit is enabled to adaptively adjust the power output.
The invention has the beneficial effects that:
1) The method of the invention provides an efficient and practical topological power router with a fault blocking function, which is provided with a tidal current bidirectional accurate linear controller, not only can realize the interconnected operation among different voltage networks, but also can operate in a direct current voltage source or current source mode, realizes the combined integration of two functions, and effectively reduces the system cost;
2) The invention has the bidirectional direct current fault isolation protection function in the network, provides the direct current side fault blocking capability, reduces the number of direct current circuit breakers configured in the line, facilitates flexible access of various types of energy sources or loads, and is beneficial to supplement and enrich the functions of the power supply network in the existing transformer substation;
3) The method of the invention provides an organic integration scheme of the converter power flow regulation and control and fault protection strategy, improves the flexibility and reliability of the control of the in-station power supply network, and meanwhile, enriches and develops the integration of a power electronic system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
fig. 1 shows a topology of a power router in a dc integrated system.
FIG. 2 is a schematic diagram of an application scenario of a power router with a current blocking and limiting capability;
fig. 3 is a schematic diagram of an application scenario of a power router connected to a high-voltage line.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal," "length," "circumferential," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically, electrically or otherwise in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The energy router topological structure based on flexible interconnection comprises an alternating current port unit 3, a direct current port unit (the direct current port unit in fig. 1 comprises two direct current ports, namely a direct current port I1 and a direct current port II 2) and a direct current bus Vm, wherein one end of the alternating current port unit 3 is connected with the direct current bus Vm, and the other end of the alternating current port unit 3 is connected with an external direct current line.
Under the condition of grid connection, the bidirectional alternating current port provides stable voltage for the direct current bus Vm, and simultaneously provides a bidirectional power loop to absorb transmission power of a post-stage circuit or supplement release power of a direct current circuit; the fully-controlled power device is a bidirectional alternating current converter, and the specific circuit topology can be a three-phase full-bridge circuit or a three-phase half-bridge circuit.
The direct current port unit has the main function of controlling voltage, current or power values at two ends of an output side according to requirements, and the purpose of changing power flow distribution in a circuit through equivalent impedance in the circuit is achieved. The topology structure can be H-bridge topology, buck circuit, boost circuit or a combination of a plurality of half-bridge circuits.
The technical solutions of several specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the electric power energy router of the common dc bus of the present invention includes an ac port unit electrically connected to an ac power grid, a dc bus, and a dc port unit connected to a distributed photovoltaic/energy storage; the direct current interface 1 and the direct current interface 2 are respectively connected with a common direct current bus Vm; the alternating current port 3 of the alternating current converter unit is connected with an alternating current power grid, and the voltages of the alternating current power grid are Va, vb and Vc respectively; the voltage of the DC bus is V1, and the current of the DC bus is I 1 (ii) a DC interface1, a direct current port at one side is connected with a direct current bus Vm, one end is connected with the direct current bus, and the voltage of the direct current bus is V 2 The direct current bus current is I 2 (ii) a The DC port 2 at the other side of the DC interface 1 is connected to a photovoltaic/energy storage power supply, one end of the DC interface is connected to a DC bus, and the DC voltage is V 1 Direct current is I 1 。
The dc interface unit may be in the form of buck, boost, half bridge, or full bridge conversion topology shown in fig. 2 according to actual requirements. In this embodiment, a boost circuit topology is adopted, which includes a power switch tube, a diode and a smoothing reactor, the positive electrode of the high-voltage side of the dc interface is connected to the positive electrode of the dc bus, the negative electrode of the high-voltage side of the dc interface is connected to the negative electrode of the dc bus, the negative electrodes of the low-voltage dc port of the dc interface and the negative electrodes of the diode rectification units at the low-voltage sides are connected to the negative electrode N of the dc bus of the low-voltage dc power grid 2 。
The alternating current interface converter unit adopts a three-phase half-bridge conversion topology, and the specific form of the topology structure can be a three-phase full-bridge or multi-level topology according to the actual requirement, so that no technical obstacle exists for the technical personnel in the field.
Based on the power router structure of the common dc bus converter topology, the design method and control method of the energy router are further described below.
If the topological structure and the diode performance of each direct current interface unit are completely the same, the characteristics of the low-voltage side diode rectifying unit show that when the direct current interface unit operates stably, the voltage V of the direct current port 1 is V 1 And a DC port 2 voltage V 2 Satisfies the following conditions:
V 1 ≠V 2 、I 1 ≠I 2
ignoring the losses of the energy router, the input power and the output power of the energy router are equal, i.e.
V 1 *I 1 +V 2 *I 2 ＝V a、b、c *I a、b、c
When V is 1 >V 2 ，I 2 >I 1 I.e. electric energy from the dc port 1 toAnd the direct current port 2 is used for transmission.
The power router based on the common direct current bus can realize bidirectional energy flow.
As shown in fig. 2, the present embodiment provides an application scenario of a power router with a blocking and current limiting capability. Wherein the content of the first and second substances,
the alternating current port is connected to an alternating current power grid, the power conversion module of the alternating current power grid is used for converting direct current into alternating current, and a fully-controlled power device is adopted in the power conversion module; the fully-controlled power device is a bidirectional alternating current converter, and the specific circuit topology can be a three-phase full-bridge circuit or a three-phase half-bridge circuit.
The two direct current ports are connected to the photovoltaic cell and the energy storage cell in a subsection mode, the main function of the photovoltaic cell and the energy storage cell is to control voltage, current or power values at two ends of an output side according to requirements, and the topological structure of the photovoltaic cell can be H-bridge topology, buck circuit, boost circuit or combination of a plurality of half-bridge circuits.
When the power router works in an alternating current power grid connection mode, an alternating current port is connected to a high-voltage direct current power grid of a commercial power grid to transmit to a low-voltage direct current power grid, a power converter at the alternating current port side works in a power mode control mode with a power factor of 1, a direct current side of the alternating current port works in a direct current voltage control mode, when load power on a direct current bus fluctuates, direct current voltage at the direct current side of the alternating current port is dynamically adjusted, power input at the alternating current side of the alternating current port is changed, and a voltage unit at the direct current side of the alternating current port adaptively adjusts power output through direct current feedforward control and direct current voltage control.
When the electric power router works in a power exchange mode and energy is transmitted to an alternating current power grid from a direct current port, the alternating current port unit works in a direct current voltage control mode, and the alternating current side of the alternating current port works in an alternating current power control mode; and when the output power of the alternating current power grid fluctuates, the direct current bus side direct current port of the direct current port adaptively adjusts the power output.
The conversion unit in the DC side port adopts a full-control power electronic device, and compared with an AC-DC conversion topology adopting an uncontrolled or semi-controlled power electronic device, the output voltage can be more accurately controlled; the alternating current port can adopt a diode rectifying unit and an uncontrolled power electronic device, the device has strong through-current capacity, high voltage resistance and low cost, and compared with an alternating current-direct current conversion topology adopting a fully controlled power electronic device, the device has the advantages of few required devices, low cost, simple control and mature technology. Different direct current interfaces are connected in parallel at the direct current side, respective advantages can be exerted, voltage stability is achieved, control is simple, cost is low, the direct current power supply is more suitable for various energy flexible access occasions, and meanwhile bidirectional electric energy transmission can be achieved.
As shown in fig. 3, the present embodiment provides an application scenario of a power router connected to a high-voltage line.
The alternating current port is respectively connected to an alternating current power grid and the small fan, the power conversion module of the small fan is used for converting wind power into alternating current or converting direct current into alternating current, and a full-control power device is adopted in the small fan; the fully-controlled power device is a bidirectional alternating current converter, and the specific circuit topology can be a three-phase full-bridge circuit or a three-phase half-bridge circuit.
The two direct current ports are connected to an energy storage battery and one bridge arm of an MMC bridge topology in a subsection mode, the energy storage battery has the main function of controlling output power or absorbed power according to requirements, the topology structure of the energy storage battery can be an H bridge topology, a buck circuit and a boost circuit, power can be exchanged with a high-voltage power grid through one unit of the MMC, ultrahigh transformation ratio power conversion is achieved, and power exchange between a low-voltage part and a high-voltage alternating current system is achieved.
The topological structure of the power router with the fault blocking function, which is provided by the invention, provides the direct current side fault blocking capability so as to realize the organic integration of the power flow regulation and control of the converter and the fault protection strategy, improve the flexibility and reliability of the control among various energy sources of the comprehensive energy station, and simultaneously enrich and develop the integration of the comprehensive energy system.
Compared with the direct current power router researched at present, the power router topological structure based on the direct current integration mode and the control strategy thereof provided by the invention have the following characteristics and advantages:
1) The power flow bidirectional accurate linear control system has a bidirectional accurate linear control function of power flow, not only can realize the interconnected operation among different voltage networks, but also can operate in a voltage source or current source mode, has flexible and changeable control means, and is convenient for flexible access of various types of energy sources or loads of different types.
2) The bidirectional direct current fault isolation protection function in the network is achieved, the number of direct current circuit breakers arranged in a line can be reduced, and the system cost can be reduced.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (6)

1. An energy router topological structure based on flexible interconnection is characterized in that: the topological structure comprises an alternating current port unit, a direct current port unit and a direct current bus; the alternating current port unit and the direct current port unit are respectively connected to two sides of the direct current bus;
one end of the alternating current port unit is electrically connected with the direct current bus, and the other end of the alternating current port unit is electrically connected with an external alternating current line; the direct current port unit is electrically connected with the direct current bus;
the alternating current port unit adopts a bidirectional alternating current port structure, provides stable voltage for a direct current bus under the condition of grid connection, and provides a bidirectional power loop to absorb transmission power of a post-stage circuit or supplement release power of a direct current circuit;
and the direct current port unit controls the voltage, current or power value at two ends of the output side according to the requirement, and is used for changing the power flow distribution in the line through the equivalent impedance in the line.
2. The flexible interconnection-based energy router topology and the control method thereof according to claim 1, wherein: and a fully-controlled power device is adopted in the alternating current port unit.
3. The flexible interconnection-based energy router topology and the control method thereof according to claim 1, wherein: the ac port unit further includes a power conversion module for converting the dc power to ac power.
4. The flexible interconnection-based energy router topology and the control method thereof according to claim 3, wherein: the power conversion module adopts a bidirectional alternating current converter structure, and the specific circuit topology can be a three-phase full-bridge circuit or a three-phase half-bridge circuit.
5. The flexible interconnection-based energy router topology and the control method thereof according to claim 1, wherein: the topology structure of the direct current port unit can be an H-bridge topology, a buck circuit, a boost circuit or a combination of a plurality of half-bridge circuits.
6. A topology control method for controlling the flexible interconnect-based energy router topology according to any one of claims 1 to 5, characterized by: the control method comprises the following steps:
when the power router works in an alternating current grid-connected working mode, an alternating current port unit is connected to a high-voltage direct current power grid of a commercial power grid to transmit to a low-voltage direct current power grid, a power conversion module of the alternating current port unit works in a power mode control mode with a power factor of 1, a direct current side of the alternating current port unit works in a direct current voltage control mode, when load power on a direct current bus Vm fluctuates, direct current voltage on the direct current side of the alternating current port unit is dynamically adjusted, power input on the alternating current side of the alternating current port unit is changed, and power output of the direct current side voltage of the alternating current port unit is adaptively adjusted through direct current feedforward control and direct current voltage control;
when the electric power router works in a power exchange mode and energy is transmitted from the direct current port unit to the alternating current power grid, the alternating current port works in a direct current voltage control mode, and the alternating current side of the alternating current port unit works in an alternating current power control mode; and when the output power of the alternating current power grid fluctuates, the direct current port on the direct current bus side of the direct current port unit is enabled to adaptively adjust the power output.
CN202210982096.0A 2022-08-16 2022-08-16 Energy router topological structure based on flexible interconnection and control method thereof Pending CN115579969A (en)

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CN116526866A (en) * 2023-06-15 2023-08-01 上海奔曜科技有限公司 Topological structure of robot power supply and robot
CN117254473A (en) * 2023-11-20 2023-12-19 国网天津市电力公司经济技术研究院 PWM current source type power flow transfer device containing energy storage
CN117689214A (en) * 2024-01-31 2024-03-12 天津华凯电气有限公司 Dynamic safety assessment method for energy router of flexible direct-current traction power supply system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116526866A (en) * 2023-06-15 2023-08-01 上海奔曜科技有限公司 Topological structure of robot power supply and robot
CN117254473A (en) * 2023-11-20 2023-12-19 国网天津市电力公司经济技术研究院 PWM current source type power flow transfer device containing energy storage
CN117689214A (en) * 2024-01-31 2024-03-12 天津华凯电气有限公司 Dynamic safety assessment method for energy router of flexible direct-current traction power supply system

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