CN106786598B - Alternating-current and direct-current seamless hybrid fully-controllable flexible power distribution system and method for hierarchical networking - Google Patents
Alternating-current and direct-current seamless hybrid fully-controllable flexible power distribution system and method for hierarchical networking Download PDFInfo
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Abstract
The invention relates to an alternating current and direct current seamless mixed full-controllable flexible power distribution system and method of hierarchical networking, wherein the flexible power distribution system is composed of a plurality of single-node systems of hierarchical networking, and flexible power distribution core equipment in the single-node systems comprises an electric energy exchanger, an alternating current grid-connected electric power collector and a direct current grid-connected electric power collector, wherein the alternating current grid-connected electric power collector and the direct current grid-connected electric power collector are connected with the electric energy exchanger; the high-voltage side alternating current and direct current interfaces of the electric energy exchangers in the single-node system are respectively connected to the high-voltage alternating current distribution line and the high-voltage direct current distribution line, and after the single-node system is networked in a layered mode, the electric energy exchangers in the node systems are seamlessly interconnected through the high-voltage alternating current distribution line and the high-voltage direct current distribution line. The invention realizes the hierarchical networking and the AC/DC seamless mixing of the flexible power distribution system, effectively reduces the complexity of the active power distribution system, and obviously improves the acceptance of the power distribution system to new elements such as distributed power sources, micro-grids, flexible loads and the like in the future.
Description
Technical Field
The invention relates to a fully controllable and flexible power distribution system, in particular to an alternating current/direct current seamless hybrid fully controllable and flexible power distribution system and method for hierarchical networking.
Background
The high permeability of a large number of intermittent distributed power sources is connected to the power distribution network, the traditional power distribution network becomes active, the original structural mode (radial mode and weak connection of feeder lines) is shown in fig. 1 (a), (b) and (c), the power distribution network in the structural mode is difficult to accommodate the connection of a large number of distributed power sources, micro-grids and flexible loads, the connection of new elements causes the complexity of the power distribution network to be greatly increased, various converters, regulators, stabilizers, controllers and compensators are additionally arranged on the complicated power distribution system, the problem of the connection of new elements is solved temporarily, the structure of the power distribution network is more complex, the cost of the mode is high, and the difficulty of system operation control and maintenance is greatly increased.
Along with the increase of nonlinear load, precision manufacturing load and direct current load, the requirements of users on the power quality of a power distribution network and the customized power consumption of various power forms are also more and more strong, the current mode of ensuring the power quality and supplying power to the direct current load by a large number of dispersive rectifying devices by the users is not the optimal and most economical choice, the cost is increased, the power quality problem is easy to generate, the energy efficiency is also seriously reduced, and meanwhile, the current power distribution network cannot meet the customized power consumption requirement problem of various forms. If the direct current distribution network with various voltage levels is independently built on the side of the medium-low voltage distribution network, the energy efficiency problem and the economy are also challenged, the interfaces of the distributed power supply, the micro-grid and the flexible load are increasingly blurred, the deep participation of the power users in the operation and the management of the distribution network is increasingly strong, the current centralized control and passive management mode is hopefully changed, innovation is carried out on the self-framework of the distribution network, and a power distribution system with centralized and distributed combination, active control, layering and alternating current-direct current mixing is established.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an alternating-current and direct-current seamless hybrid full-controllable flexible power distribution system, key equipment and a method for hierarchical networking, and provides a hierarchical networking model for full-controllable flexible power distribution and a full-controllable flexible power distribution system constructed based on the model, so that the current centralized control and passive management modes are effectively changed, the hierarchical progressive active control flexible power distribution combined with centralized and distributed is built on the self-framework of a power distribution network, and the related problems under the current power distribution network framework are solved.
The invention aims at adopting the following technical scheme:
the invention provides an alternating current and direct current seamless hybrid full-controllable flexible power distribution system of a hierarchical networking, which is characterized in that the power distribution system consists of a plurality of single-node systems of the hierarchical networking, and the single-node systems consist of an electric energy exchanger, an alternating current grid-connected power collector and a direct current grid-connected power collector in the hierarchical networking; each single-node system in the power distribution system is interconnected through a high-voltage alternating-current power distribution line and a high-voltage direct-current power distribution line at the high-voltage side of the electric energy exchanger, so that horizontal networking is realized, and the electric energy exchanger is connected to the electric energy collector and then connected to the lower stage of the electric energy collector, so that vertical networking with high, medium and low voltage levels is realized; the high-voltage side alternating current and direct current interfaces of the electric energy exchanger in the single-node system are respectively connected to the high-voltage alternating current and direct current distribution lines, and the low-voltage alternating current and direct current sides of the electric energy exchanger are connected with the alternating current grid-connected type electric energy collector and the direct current grid-connected type electric energy collector which are provided with the interfaces of corresponding grades.
Further, a low-voltage side alternating current interface of the electric energy exchanger is connected with an alternating current grid-connected power concentrator with a corresponding voltage level grid-connected interface through an alternating current power line, and a distributed power supply, energy storage and alternating current load with corresponding connected voltage levels; the low-voltage direct-current interface of the electric energy exchanger is connected with a direct-current grid-connected power collector with a grid-connected interface with a corresponding voltage level through a direct-current power line, and is connected with a distributed power supply, energy storage and direct-current load with the corresponding voltage level;
the medium-low voltage direct current power interfaces of the alternating current grid-connected power collector realize the access of distributed power supplies, energy storage and direct current loads with corresponding voltage levels;
the high-voltage side alternating current interface and the direct current interface of the electric energy exchanger are respectively connected with a high-voltage alternating current distribution line and a high-voltage direct current distribution line, and the electric energy exchanger in each node system realizes transverse networking through the high-voltage alternating current distribution line and the high-voltage direct current distribution line at the high-voltage side; the electric energy exchanger is connected to the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector, and then is connected to different voltage levels and different forms of the lower stages of the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector for longitudinal networking, and the transverse networking and the longitudinal networking form a fully controllable flexible power distribution system of hierarchical networking.
Further, the electric energy exchanger is used for providing high-voltage side alternating current and direct current interfaces and low-voltage side alternating current and direct current interfaces; the alternating current grid-connected power concentrator is used for providing an alternating current side grid-connected interface and a medium-low voltage direct current power interface; the direct current grid-connected power concentrator is used for providing a direct current grid-connected interface and a medium-low voltage direct current power interface.
Further, the high-voltage side alternating current and direct current interface provided by the electric energy exchanger is used for being respectively connected with a high-voltage alternating current distribution line AC1 kV-35 kV and a high-voltage direct current distribution line DC1.5kV-65 kV; the low-voltage side alternating current interface is used for connecting 100V-380V of alternating current power utilization line AC, and the low-voltage side direct current interface is used for connecting 150V-800V of direct current power utilization line DC; the grid-connected alternating current power collector provides an alternating current grid-connected interface corresponding to the alternating current interface at the low-voltage side of the electric energy exchanger, and provides a direct current power interface at the medium-low voltage side, which is used for connecting a low-voltage direct current power line DC 5V-48V and a medium-voltage direct current power line DC 100V-400V; the grid-connected direct current power collector provides a direct current grid-connected interface corresponding to the direct current interface at the low-voltage side of the electric energy exchanger, and provides a medium-low voltage direct current power interface for connecting a low-voltage direct current power line DC 5V-48V and a medium-voltage direct current power line DC 100V-400V. Further, the electric energy exchanger internally comprises an electric information layer and an electric physical layer which are connected with each other; the electrical information layer comprises a monitoring module, an intelligent control module, a communication module and an information processing module; the electric physical layer power electronic solid-state module and the electric energy interface module; each module in the electrical physical layer is connected with each other; the intelligent control module is connected with the power electronic solid-state module to jointly complete flexible alternating current and direct current electric energy conversion in the electric energy exchanger and the power collector, so that the flexible alternating current and direct current seamless mixing of the power distribution system is realized.
Further, the power electronic solid-state module of the electric energy exchanger comprises a solid-state module controller, a protection and driving module and a sensing module which are sequentially connected; the electric energy interface module of the electric energy exchanger comprises a high-voltage alternating current interface, a high-voltage direct current interface, a low-voltage alternating current interface and a low-voltage direct current interface; the alternating current grid-connected power collector electric energy interface module comprises an alternating current grid-connected interface, a medium-voltage direct current interface and a low-voltage direct current interface; the direct current grid-connected power collector electric energy interface module comprises a direct current grid-connected interface, a medium-voltage direct current interface and a low-voltage direct current interface. The electric energy exchanger is respectively in communication with the alternating current grid-connected type electric energy collector and the direct current grid-connected type electric energy collector through conversion of various communication protocols and various information interaction, so that intelligent control of the electric energy exchanger, the alternating current grid-connected type electric energy collector and the direct current grid-connected type electric energy collector in the area, distributed power sources with corresponding voltage levels and forms, plug and play of controllable loads and the like are realized.
The invention also provides a specific implementation method of the hierarchical networking AC/DC seamless hybrid fully-controllable flexible power distribution system, which is characterized in that the implementation method of the system comprises the following steps:
step 1: determining a single node hierarchical networking model of the fully controllable flexible power distribution system, and constructing a single node system;
step 2: and (3) connecting high-voltage side alternating current and direct current interfaces of the electric energy exchangers in the plurality of single-node systems to a high-voltage alternating current distribution line and a high-voltage direct current distribution line respectively to realize transverse networking interconnection, and combining the step (1) to form an alternating current-direct current seamless hybrid fully-controllable flexible distribution system of the hierarchical networking.
Further, in the step 1, the single node hierarchical networking model includes an electric energy exchanger, an ac grid-connected power concentrator and a dc grid-connected power concentrator, where the ac grid-connected power concentrator and the dc grid-connected power concentrator are both connected with the electric energy exchanger.
Further, in the step 2, the low-voltage ac interface of the electric energy exchanger is connected with an ac grid-connected power collector having a grid-connected interface with a corresponding voltage level, and a distributed power supply, energy storage and ac load with a corresponding voltage level through an ac power line; the low-voltage direct-current interface of the electric energy exchanger is connected with a direct-current grid-connected power collector with a grid-connected interface with a corresponding voltage level through a direct-current power line, and a distributed power supply, energy storage and direct-current load with the corresponding voltage level are connected; the low-voltage direct current power output interface of the alternating current grid-connected power collector realizes the access of a distributed power supply, energy storage and alternating current load with corresponding voltage levels, and the medium-low voltage direct current power output interface of the direct current grid-connected power collector realizes the access of the distributed power supply, energy storage and direct current load with corresponding voltage levels; the high-voltage alternating current interface and the high-voltage direct current interface of the electric energy exchanger are respectively connected with a high-voltage alternating current distribution line and a high-voltage direct current distribution line, and the electric energy exchanger in each node system realizes transverse networking through the high-voltage alternating current distribution line; the electric energy exchanger is connected to the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector, and then is connected to different voltage levels and different forms of the lower stages of the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector for longitudinal networking, and the transverse networking and the longitudinal networking form a fully controllable and flexible power distribution system with seamless alternating current and direct current mixed of hierarchical networking.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the invention provides a fully controllable and flexible power distribution system model of a hierarchical networking and a fully controllable and flexible power distribution system constructed based on the model, which can accommodate plug and play access of a large-scale distributed power supply, energy storage, flexible load and the like, realize unified coordination management, realize multidirectional flow of energy, effectively improve the energy utilization rate and save the distributed access and future distribution network reconstruction cost. Meanwhile, the system can realize the full equal-to-equal alternating current and direct current seamless mixed power distribution network which is autonomous in area distribution, flexible in electric energy conversion and grid-shaped, has self-healing, network reconstruction and immunity, has extremely high power supply reliability, and basically eliminates the risk of large-area power failure. The system integrates the power grid physical system and the power grid communication information system to realize an energy, electric power and information comprehensive service system covering urban and rural areas.
Drawings
FIG. 1 is a schematic diagram of a conventional power distribution system in which (a) is a radial fashion; (b) a single contact mode of the transformer substation; (c) a single contact mode between substations;
FIG. 2 is a single node hierarchical networking model of the AC/DC seamless hybrid fully controllable flexible power distribution system provided by the invention;
FIG. 3 is a diagram of an AC/DC seamless hybrid fully controllable flexible power distribution system network architecture provided by the invention;
FIG. 4 is a schematic diagram of a flexible power distribution critical equipment system architecture provided by the present invention, (a) is an electrical energy exchanger system architecture; (b) is an alternating current grid-connected power concentrator system structure; and (c) the system structure of the direct current grid-connected power concentrator.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
Example 1
The invention provides an alternating current and direct current seamless mixing fully controllable flexible power distribution system based on a hierarchical networking model. Through the fully controllable flexible power distribution series equipment based on the fusion of the electrical information physical system: (1) the electric energy exchanger provides a high-voltage alternating current/direct current interface; a low-voltage AC/DC interface; (2) the power collector is used for providing an alternating current/direct current grid-connected interface respectively; the alternating current grid-connected type provides a medium-low voltage direct current power consumption interface, and the direct current grid-connected type provides a medium-low voltage direct current power consumption interface. The high-voltage side alternating current and direct current interfaces of the electric energy exchangers are respectively interconnected through a high-voltage alternating current distribution line and a direct current distribution line. The low-voltage alternating-current/current interfaces of the electric energy exchangers are connected with an alternating-current grid-connected power concentrator with an alternating-current grid-connected interface with corresponding voltage levels through alternating-current power utilization lines, and distributed power sources, energy storage, alternating-current loads and the like with the corresponding voltage levels are connected; the low-voltage direct current interfaces of the electric energy exchangers are connected with direct current grid-connected power collectors with direct current grid-connected interfaces with corresponding voltage levels through direct current power utilization lines, and distributed power sources, energy storage, direct current loads and the like with corresponding voltage levels are connected; the medium-low voltage direct current power interfaces of the alternating current type and direct current type power collectors can also realize the connection of distributed power supplies, energy storage, alternating current and direct current loads and the like with corresponding voltage grades; the high-voltage side alternating current interface and the direct current interface of the electric energy exchanger are respectively connected with a high-voltage alternating current distribution line and a direct current distribution line, and the electric energy exchanger in each node system realizes transverse networking through the high-voltage alternating current distribution line; the electric energy exchanger is longitudinally networked to the electric energy collector and then to different voltage levels and forms of the lower stage of the electric energy collector, so that the fully controllable and flexible power distribution system with the seamless alternating current and direct current mixed of the hierarchical networking is constructed.
The flexible power distribution system has great difference with the current rigid power distribution network comprising an AC/DC hybrid micro-grid, as described above, the electric energy exchanger in the flexible power distribution system uniformly provides high-voltage side AC/DC (AC 1 kV-35 kV and DC1.5 kV-65 kV) interfaces and low-voltage side AC/DC interfaces, and realizes the interconnection of the high-voltage sides of the electric energy exchanger in the system, the medium-low voltage level multi-port AC/DC seamless power supply and distribution, the access of corresponding voltage level power concentrators, distributed power sources, energy storage, flexible loads and the like. Meanwhile, the management of the power demand side, the organic integration of a distributed power supply, a flexible load and a power distribution network, the plug and play of the power supply and a user and the multi-quality electric energy customization service of the user are realized by depending on the electric energy exchanger and the electric energy collector.
Example 2
The invention provides a fully controllable and flexible power distribution key device: a fully controllable and flexible distribution hierarchical networking model of an electric energy exchanger and an electric energy collector and a fully controllable and flexible distribution system constructed based on the model. In the flexible power distribution system, grid-connected control, energy management and coordinated operation are uniformly carried out by fully controllable flexible power distribution series equipment, wherein an electric energy exchanger uniformly provides high-voltage alternating current and direct current interfaces which are respectively used for connecting 1 kV-35 kV of a high-voltage alternating current power distribution line and 1.5 kV-65 kV of a high-voltage direct current power distribution line; the low-voltage alternating current interface is used for connecting an alternating current power utilization line AC 100V-380V, and the low-voltage direct current interface is used for connecting a direct current power utilization line DC 150V-800V; the grid-connected alternating current power collector provides an alternating current grid-connected interface corresponding to an alternating current interface at the low-voltage side of the electric energy exchanger, and provides a direct current power utilization interface at the medium-low voltage side, which is used for connecting a low-voltage direct current power utilization line DC 5V-48V and a medium-voltage direct current power utilization line DC 100V-400V; the grid-connected direct current power collector provides a direct current grid-connected interface corresponding to a direct current interface at the low voltage side of the electric energy exchanger, and provides a medium-low voltage direct current power interface for connecting a low voltage direct current power line DC 5V-48V and a medium voltage direct current power line DC 100V-400V. The full-controllable flexible power distribution key equipment taking the electric energy exchanger and the electric power collector as cores is interconnected and networked to form a single node hierarchical networking model of the full-controllable flexible power distribution system, and a single node full-controllable flexible power distribution system is built, and a plurality of single nodes are networked to further build the full-controllable flexible power distribution system with seamless AC/DC mixing.
(1) Single node hierarchical networking model of fully controllable flexible power distribution system
Fig. 2 shows a single node hierarchical networking model of a fully controllable flexible power distribution system using an electric energy exchanger and an electric power collector as core power distribution equipment, wherein the model comprises an electric energy exchanger, an alternating current grid-connected electric power collector and a direct current grid-connected electric power collector, and the model is used for conveniently describing the system. Fig. 2 shows a single node hierarchical networking model of a fully controllable flexible power distribution system with power exchangers and power concentrators as core power distribution equipment, which may also be referred to as a "Local Area network" (LAG). The model is a layering power distribution system integrating information flow, electric energy flow and control flow, is managed by a flexible power distribution energy management system, and is a core node model for constructing an alternating current/direct current seamless hybrid flexible power distribution network. The node forms a hierarchical structure of a power distribution local area network through distributed energy power generation, micro energy collection, aggregation and sharing and energy storage and load electricity consumption, wherein the power distribution local area network further comprises a power distribution Sub-network (Sub-LAG). The electric energy exchanger mainly builds an alternating current and direct current seamless mixed power distribution local area network facing to higher voltage level and larger capacity, and the electric power collector builds a power distribution sub-network facing to the user of alternating current and direct current seamless mixed power utilization line of lower voltage level and smaller capacity. The electric energy exchanger is novel fully controllable distribution equipment based on power electronics and information technology, integrates a distribution local area network energy management system besides a voltage transformation function, performs grid-connected function management uniformly, builds direct current and alternating current distribution lines with multiple voltage levels uniformly, controls the quality of the uniform electric energy, manages the energy uniformly, facilitates the uniform universal access, integrated control and efficient management of distributed power sources and flexible loads in the distribution local area network, and is isolated from upper faults and disturbance. The application scene of the method is mainly that a larger power supply range and a larger power distributed power supply in a distribution network are accessed and consumed. In the figure 2, the electric energy exchanger constructs a seamless hybrid distribution local area network of a high-voltage alternating-current distribution line AC1 kV-35 kV and a high-voltage direct-current distribution line DC1.5kV-65 kV, and simultaneously provides an alternating-current power utilization line AC 100V-380V and a high-voltage direct-current power utilization line DC 150V-800V, so that the requirements of various alternating-current and direct-current power utilization and the access of distributed power sources and flexible loads (distributed energy storage and electric automobiles) can be met. The novel fully controllable electric power collector is core equipment for constructing an electric power distribution network, and has similar functions as an electric energy exchanger except alternating current voltage transformation, and only the management object is a lower voltage and smaller capacity electricity utilization range. The distribution and sub-network is a component for constructing a distribution local area network, can be selectively configured according to actual application scenes, and respectively provides application scenes of combining an alternating current grid-connected power collector and a direct current grid-connected power collector into the distribution local area network in the drawing, wherein the alternating current grid-connected power collector and the direct current grid-connected power collector respectively supply alternating current power lines AC 100V-380V from an electric energy exchanger, grid-connected high-medium-voltage direct current power lines DC 150V-800V, and simultaneously provide low-voltage direct current power lines DC 5V-48V and medium-voltage direct current power lines DC 100V-400V, and can also meet the requirements of various alternating current and direct current power distribution with smaller capacity and the access of distributed power supplies and flexible loads (distributed energy storage and electric automobiles) with smaller capacity. The ac/dc power distribution lines of each voltage class provided by the electric energy exchanger and the electric energy collector in the node model can be all or combined according to actual application conditions.
The power distribution local area network and the power distribution sub network are in flexible conversion in the equipment through the electric energy exchanger and the electric energy collector, so that the alternating current and the direct current with different voltage levels are in seamless mixed and closed-loop operation, and compared with the past two mutually independent power distribution systems of alternating current and direct current, the power distribution local area network and the power distribution sub network have the advantages of control, coordination, energy efficiency, economy and the like. The hierarchical AC/DC seamless mixed flexible power distribution system is a basic node for constructing a flexible power distribution network, and the architecture combining the distribution and the concentration is more beneficial to hierarchical control, and forms a wide-area AC/DC seamless mixed flexible power distribution network from the collection of miniature and small energy sources, the absorption of energy storage and load to the interconnection of a power distribution sub-network and a power distribution local area network.
(2) Alternating current-direct current seamless mixed full-controllable flexible power distribution system for hierarchical networking
As shown in fig. 3, the hybrid AC-dc seamless flexible distribution network is formed by four distribution local area networks, i.e. a single node system, and the grid-shaped, full-peer, strong connection, AC-dc seamless hybrid, area autonomous and layered coordination modes can be seen, each distribution local area network can be interconnected by a high-voltage AC distribution line AC1 kV-35 kV and a high-voltage dc distribution line dc1.5 kV-65 kV of an electric energy exchanger, an example of the networking of the four distribution local area networks is given in fig. 3, and each distribution local area network is simultaneously connected by a high-voltage AC distribution line AC1 kV-35 kV and a high-voltage dc distribution line dc1.5 kV-65 kV of a respective electric energy exchanger, which is only an example, and in practical application, the peer-to-peer networking of 1, 2, 3, 4 or more node systems can be extended without limitation, and can be simultaneously connected with the high-voltage AC distribution line AC1 kV-35 kV and the high-voltage dc distribution line dc1.5 kV-65 kV or the high-voltage dc distribution line dc1.5kV can also be connected independently. The electric energy exchanger in each distribution local area network can provide or combine to provide 100V-380V AC power lines and 150V-800V DC power lines simultaneously according to practical application scenes, and is convenient for connecting different kinds and different numbers of power concentrators, large-capacity distributed power sources and flexible loads in a grid-connected mode. And a power distribution sub-network in the power distribution local area network can be configured by the power collector according to actual application scenes to provide 5V-48V of low-voltage direct current power utilization lines and 100V-400V of medium-voltage direct current power utilization lines simultaneously or in a combined mode, so that grid-connected access of various small-capacity distributed power supplies and flexible loads is facilitated.
The core equipment-electric energy exchanger and the electric energy collector for realizing networking in the flexible power distribution system are novel full-controllable series power distribution equipment based on the electric and electronic technology and the information technology, and besides the voltage transformation function, the novel full-controllable series power distribution equipment integrates an energy management system, uniformly performs grid-connected function management, uniformly builds direct-current and alternating-current power distribution lines with multiple voltage levels, uniformly controls the electric energy quality and the energy management, conveniently solves the problems of uniform universal access, integrated control and efficient management of distributed power sources and flexible loads in the power distribution network, and is isolated from upper faults and disturbance. The system structure is shown in fig. 4 (a), (b) and (c), and mainly comprises: the system comprises a power electronic solid-state module, an electric energy interface module, a monitoring module, an energy storage module (optional), an intelligent control module, a communication module and an information processing module. The core module is a power electronic solid-state module and mainly comprises: a solid state module controller, a protection and driving module, a sensing module, and the like. The electric energy exchanger and the electric energy collector realize intelligent control of the electric energy exchanger and the electric energy collector in the area and plug and play of distributed power sources, controllable loads and the like with corresponding voltage levels and forms through conversion of various communication protocols and various information interactions. The functions of each module of the power collector and the power exchanger are similar, but the application scene, the circuit mode, the variable current model and the specific implementation circuit topology are different.
Aiming at the problems that the existing active power distribution network cannot solve the problems of high-efficiency access, plug and play, centralized control, development of a future alternating current/direct current hybrid power distribution network and the like, the invention provides a fully controllable and flexible power distribution hierarchical networking model and an alternating current/direct current seamless hybrid fully controllable and flexible power distribution system constructed based on the model, and the structural mode of the power distribution network is innovated, and the seamless hybrid, flexible and controllable intelligent management and allocation of alternating current/direct current power are realized through the fully controllable and flexible power distribution core equipment, namely the hierarchical networking of an electric energy exchanger and an electric energy collector, so that the complexity of the system of the active power distribution network is effectively reduced, the variety and the number of scattered equipment are reduced, the operation controllability and maintainability are improved, and the acceptance of the future power distribution network to new elements such as distributed power sources, micro-grids and flexible loads is remarkably improved.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention.
Claims (3)
1. The alternating current and direct current seamless hybrid fully controllable flexible power distribution system is characterized by comprising a plurality of single-node systems which are connected in a hierarchical mode, wherein each single-node system comprises an electric energy exchanger, an alternating current grid-connected type electric power collector and a direct current grid-connected type electric power collector in the hierarchical mode; the high-voltage side alternating current and direct current interfaces of the electric energy exchanger in the single-node system of the power distribution system are respectively connected to the high-voltage alternating current distribution line and the high-voltage direct current distribution line, the low-voltage side alternating current and direct current interfaces of the electric energy exchanger generate an alternating current power utilization line and a medium-voltage direct current distribution line, and the alternating current grid-connected power collector and the direct current grid-connected power collector are respectively connected; after the single-node hierarchical networking, the electric energy exchangers in each single-node system are interconnected through a high-voltage alternating-current distribution line and a high-voltage direct-current distribution line;
the low-voltage side alternating current interface of the electric energy exchanger is connected with an alternating current grid-connected power collector with a corresponding voltage level grid-connected interface through an alternating current power utilization line, and is connected with a distributed power supply, energy storage and alternating current load with corresponding voltage levels; the low-voltage side direct current interface of the electric energy exchanger is connected with a direct current grid-connected power concentrator with a grid-connected interface with a corresponding voltage level through a medium-voltage direct current distribution line, and a distributed power supply with a corresponding voltage level, energy storage and direct current load are connected;
the medium-low voltage side direct current power utilization interface of the alternating current grid-connected power collector realizes the access of a distributed power supply, energy storage and direct current load with corresponding voltage levels, and the low voltage side direct current power utilization interface of the direct current grid-connected power collector realizes the access of the distributed power supply, energy storage and direct current load with corresponding voltage levels;
the high-voltage side alternating current interface and the direct current interface of the electric energy exchanger are connected with a high-voltage alternating current/direct current distribution line, and the electric energy exchanger in each node system realizes transverse networking interconnection through the high-voltage alternating current/direct current distribution line; the electric energy exchanger is connected to the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector, and then is connected to different voltage levels and different forms of the lower stages of the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector for longitudinal networking, and the transverse networking and the longitudinal networking form a fully controllable flexible power distribution system of hierarchical networking;
the high-voltage side alternating current and direct current interfaces provided by the electric energy exchanger are used for connecting 1 kV-35 kV of a high-voltage alternating current distribution line AC and 1.5 kV-65 kV of a high-voltage direct current distribution line DC1.5kV, the alternating current interface at the low-voltage side is used for connecting 100V-380V of an alternating current power utilization line AC, and the direct current interface at the low-voltage side is used for connecting 150V-800V of a medium-voltage distribution line DC; the alternating current grid-connected power collector provides an alternating current grid-connected interface AC 100V-380V corresponding to the low-voltage side alternating current interface of the electric energy exchanger, and provides a medium-low voltage side direct current power interface for connecting a low-voltage direct current power line DC 5V-48V and a medium-voltage direct current power line DC 100V-400V; the direct-current grid-connected power collector provides a direct-current grid-connected interface DC 150V-800V corresponding to a low-voltage side direct-current interface of the electric energy exchanger, and provides a medium-low voltage direct-current power interface for connecting a low-voltage direct-current power line DC 5V-48V and a medium-voltage direct-current power line DC 100V-400V;
the electric energy exchanger internally comprises an electric information layer and an electric physical layer which are connected with each other; the electrical information layer comprises a monitoring module, an intelligent control module, a communication module and an information processing module; the electric physical layer power electronic solid-state module and the electric energy interface module energy storage module; each module in the electrical physical layer is connected with each other; the intelligent control module and the communication module are connected with the power electronic solid-state module to jointly complete flexible alternating current/direct current electric energy conversion in the electric energy exchanger and the power collector, so that the alternating current/direct current seamless mixing of a flexible power distribution system is realized;
the power electronic solid-state module comprises a solid-state module controller, a protection and driving module and a sensing module which are connected in sequence; the electric energy interface module of the electric energy exchanger comprises a high-voltage alternating current interface, a high-voltage direct current interface, a low-voltage alternating current interface and a medium-voltage direct current interface; the alternating current grid-connected power collector electric energy interface module comprises an alternating current grid-connected interface, a medium-voltage direct current interface and a low-voltage direct current interface; the direct-current grid-connected power collector electric energy interface module comprises a direct-current grid-connected interface, a medium-voltage direct-current interface and a low-voltage direct-current interface;
the electric energy exchanger is respectively in communication with the alternating current grid-connected type electric energy collector and the direct current grid-connected type electric energy collector through conversion of various communication protocols and various information interaction, so that intelligent control of the electric energy exchanger, the alternating current grid-connected type electric energy collector and the direct current grid-connected type electric energy collector in an area, plug and play of distributed power sources, controllable loads and the like with corresponding voltage levels and forms are realized.
2. The ac/dc seamless hybrid fully controllable flexible power distribution system of claim 1, wherein the power exchanger is configured to provide a high side ac/dc interface and a low side ac/dc interface; the alternating current grid-connected power concentrator is used for providing an alternating current side grid-connected interface and a medium-low voltage side direct current power utilization interface; the direct-current grid-connected power collector is used for providing a medium-voltage side direct-current power distribution grid-connected interface and a medium-low voltage side direct-current power utilization interface;
3. a power distribution method of an ac/dc seamless hybrid fully controllable flexible power distribution system using the hierarchical networking according to any one of claims 1-2, characterized in that the power distribution method of the flexible power distribution system comprises the following steps:
step 1: determining a single node hierarchical networking model of the fully controllable flexible power distribution system, and constructing a single node system;
step 2: the method comprises the steps that high-voltage side alternating current/direct current interfaces of electric energy exchangers in a single-node system of a plurality of hierarchical networking are respectively connected to a high-voltage alternating current distribution line and a high-voltage direct current distribution line to realize horizontal networking interconnection, and an alternating current/direct current seamless mixing fully controllable flexible distribution system of the hierarchical networking is formed by combining the step 1;
in the step 1, the single node hierarchical networking model comprises an electric energy exchanger, an alternating current grid-connected electric power collector and a direct current grid-connected electric power collector, wherein the alternating current grid-connected electric power collector and the direct current grid-connected electric power collector are both connected with the electric energy exchanger;
in the step 2, a low-voltage ac interface of the electric energy exchanger is connected with an ac grid-connected power concentrator with a grid-connected interface with a corresponding voltage level, and a distributed power supply, energy storage and ac load with a corresponding voltage level which are connected with the ac grid-connected power concentrator through an ac power line; the low-voltage direct current power utilization interface of the electric energy exchanger is connected with a direct current grid-connected power collector with a grid-connected interface with a corresponding voltage level through a direct current power utilization line, and a distributed power supply, energy storage and direct current load with the corresponding voltage level are connected;
the medium-low voltage direct current power interface of the alternating current grid-connected power collector realizes the access of a distributed power supply, energy storage and direct current load with corresponding voltage grades; the medium-low voltage direct current power interface of the direct current grid-connected power collector realizes the access of a distributed power supply, energy storage and direct current load with corresponding voltage grades; the high-voltage alternating current interface and the direct current interface of the electric energy exchanger are respectively connected with a high-voltage alternating current distribution line and a high-voltage direct current distribution line, and the electric energy exchanger in each node system realizes transverse networking through the high-voltage alternating current distribution line and the high-voltage direct current distribution line; the electric energy exchanger is connected to the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector, and then is connected to different voltage levels and different forms of the lower stages of the alternating current grid-connected type electric power collector and the direct current grid-connected type electric power collector for longitudinal networking, and the transverse networking and the longitudinal networking form an alternating current-direct current seamless mixing full-controllable flexible power distribution system with hierarchical networking.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578166A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Alternating current-direct current micro-grid system on basis of electricity energy collector |
| CN104578132A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Electric power collector system for alternating-current and direct-current microgrid |
| CN205429725U (en) * | 2016-03-15 | 2016-08-03 | 华北电力大学（保定） | Many generating lines residential block power supply system based on little electric wire netting of direct current |
| CN106229984A (en) * | 2016-08-31 | 2016-12-14 | 中国电力科学研究院 | A kind of multiport electric energy exchanger based on alternating current-direct current mixing adapted electricity |
-
2016
- 2016-12-29 CN CN201611241294.2A patent/CN106786598B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578166A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Alternating current-direct current micro-grid system on basis of electricity energy collector |
| CN104578132A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Electric power collector system for alternating-current and direct-current microgrid |
| CN205429725U (en) * | 2016-03-15 | 2016-08-03 | 华北电力大学（保定） | Many generating lines residential block power supply system based on little electric wire netting of direct current |
| CN106229984A (en) * | 2016-08-31 | 2016-12-14 | 中国电力科学研究院 | A kind of multiport electric energy exchanger based on alternating current-direct current mixing adapted electricity |
Non-Patent Citations (1)
| Title |
|---|
| 《面向能源互联网的灵活配电系统关键装备与组网形态研究》;盛万兴等;《中 国 电 机 工 程 学 报》;20150805;第35卷(第15期);3760-3769 * |
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