CN117200361A - Networking method of dandelion type power distribution network - Google Patents
Networking method of dandelion type power distribution network Download PDFInfo
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Abstract
The invention provides a networking method of a dandelion type power distribution network, which comprises more than one power supply unit; the power supply unit comprises a low-voltage direct-current power network and more than one seed power supply unit connected with the low-voltage direct-current power network through a power receiving end; the seed power supply unit comprises a low-voltage alternating current-direct current conversion device for converting direct current received by a power receiving end into alternating current, and a power transmitting end of the low-voltage alternating current-direct current conversion device is connected with more than one power receiving end of a low-voltage alternating current power network; the power receiving end of the low-voltage direct-current power network of the power supply unit is connected with the power transmitting end of the medium-voltage direct-current power network through a direct-current transformer; the power receiving end of the medium-voltage direct-current power network is connected with the power transmitting end of more than one medium-voltage alternating-current power network through a medium-voltage alternating-current and direct-current conversion device; the invention has flexible ad hoc network function, and realizes the on-site nearby balance of distributed resources, and the power supply reliability and bearing capacity improvement.
Description
Technical Field
The invention relates to the technical field of intelligent power distribution, in particular to a networking method of a dandelion type power distribution network.
Background
The power distribution network is connected with a large number of intermittent and random distributed power supplies and charging loads in a grid-connected mode, the operation mode of a traditional alternating current power distribution network is changed, and the traditional power distribution network faces challenges in planning, design, operation control and the like. The novel source charges such as distributed photovoltaic, electric vehicles and energy storage have obvious direct current characteristics, and the demands of direct current power supply and utilization networks are increasing. Meanwhile, the efficiency of the full-link direct current mode is better than that of the traditional alternating current mode. There is therefore a need for an ac/dc hybrid power distribution system.
Besides the development of distributed new energy sources, the traditional alternating current power distribution network has higher requirements, and the traditional power distribution network also has the requirements of power supply reliability, power supply capacity, power distribution equipment asset utilization rate improvement and the like. The flexible interconnection technology of the transformer area and the feeder line is rapidly developed in recent years, and related test point application is also developed. However, the flexible interconnection of the transformer area and the feeder line is limited to the interconnection of the local power grid at the present stage, and a clear networking mode is not formed. Taking a station group micro-grid of the state network Fujian electric power as an example, a station group micro-grid demonstration is constructed through a station group flexible direct current interconnection technology, the operation of the station group micro-grid is realized, and the digestion capability and the power supply reliability of the distributed photovoltaic are effectively improved.
Disclosure of Invention
The invention provides a networking method of a dandelion type power distribution network, which forms a distributed intelligent micro-grid form by constructing a direct current public network on the basis of a traditional alternating current power distribution network, has a flexible ad hoc network function, and realizes on-site nearby balance of distributed resources, and power supply reliability and bearing capacity improvement.
The invention adopts the following technical scheme.
A networking method of a dandelion type power distribution network comprises more than one power supply unit; the power supply unit comprises a low-voltage direct-current power network and more than one seed power supply unit connected with the low-voltage direct-current power network through a power receiving end; the seed power supply unit comprises a low-voltage alternating current-direct current conversion device for converting direct current received by a power receiving end into alternating current, and a power transmitting end of the low-voltage alternating current-direct current conversion device is connected with more than one power receiving end of a low-voltage alternating current power network; the power receiving end of the low-voltage direct-current power network of the power supply unit is connected with the power transmitting end of the medium-voltage direct-current power network through a direct-current transformer; the power receiving end of the medium-voltage direct-current power network is connected with the power transmitting end of more than one medium-voltage alternating-current power network through a medium-voltage alternating-current and direct-current conversion device;
the dandelion type power distribution network is in a distributed intelligent micro-grid form formed by constructing a direct current public network on the basis of an alternating current power distribution network, and the on-site nearby balance of distributed power resources is realized through the ad hoc network function of the distributed intelligent micro-grid, and the power supply reliability and the bearing capacity are improved.
The low-voltage alternating current power network is a 380 volt low-voltage transformer area or feeder line; the medium-voltage alternating current power network takes a 110 kilovolt or 35 kilovolt transformer substation or a 10 kilovolt switching station or a 10 kilovolt ring website or a 10 kilovolt feeder line as a core node;
the voltage of the low-voltage direct-current power network is 750 volts, namely +/-375 volts, and the low-voltage direct-current power network is used for providing power for direct-current power loads; the voltage of the medium-voltage direct-current power network is 1500 volts, namely +/-375 volts, or 20 kilovolts, namely +/-10 kilovolts;
the low-voltage direct-current power network and the medium-voltage direct-current power network comprise intermittent and random distributed power supplies and charging loads; the intermittent and random distributed power supply and the charging load comprise distributed photovoltaic, electric automobile charging piles or energy storage equipment.
The alternating current side and the direct current side of the seed power supply unit are flexibly switched through grid-connected operation, and can be flexibly networked with other seed power supply units to improve the reliability of power supply;
the seed power supply unit comprises two low-voltage alternating current power networks, wherein the two low-voltage alternating current power networks are electrically connected through a low-voltage alternating current-direct current conversion device and are also connected with the low-voltage direct current power network through the low-voltage alternating current-direct current conversion device.
The topological structure of the low-voltage direct current power network is a chained structure or a looped network structure.
The low-voltage alternating-current-direct-current conversion device comprises 1 direct-current port and 2 alternating-current ports, wherein the circuit topology comprises AC/DC, DC/DC and AC/DC topological forms, and also comprises AC/AC and AC/DC/AC topological forms.
The low-voltage alternating current-direct current conversion device has alternating current power and direct current power conversion functions and is used for realizing bidirectional flow of alternating current power and direct current power.
The topological structure of the medium-voltage direct-current power network comprises a chained structure or a looped network structure.
The direct current transformer connected with the low-voltage direct current power network and the medium-voltage direct current power network has a direct current voltage control function and is used for realizing power bidirectional flow between the low-voltage direct current power network and the medium-voltage direct current power network;
the topology of the dc transformer includes a double active full bridge converter and a step-up dc transformer.
The medium voltage alternating current-direct current conversion device connected with the medium voltage direct current power network and the medium voltage alternating current power network has alternating current power and direct current power conversion functions and is used for realizing power bidirectional flow between the medium voltage direct current power network and the medium voltage alternating current power network.
The direct current public network is a direct current power network for realizing safe power supply of the low-voltage alternating current power network and the medium-voltage alternating current power network in the current level power network and the cross-level power network, and the direct current public network meets the requirement of safe power supply of at least 'N-1' in an overhaul mode and a fault mode.
The invention and the preferable scheme thereof have the following advantages:
(1) The seed power supply unit of the dandelion power distribution network realizes flexible interconnection of the traditional low-voltage alternating-current power network, and reliable power supply and dynamic capacity increase of the traditional low-voltage alternating-current power network are realized;
(2) The seed power supply unit of the dandelion power distribution network expands a low-voltage direct-current power network on the basis of a traditional alternating-current power network to provide power for direct-current power loads;
(3) The seed power supply units of the dandelion power distribution network can be flexibly switched from the grid connection at the alternating current side and the direct current side, can be flexibly connected with other seed power supply units in a networking manner, and improves the reliability of power supply;
(4) The low-voltage direct-current power network of the dandelion power distribution network is connected with the medium-voltage direct-current power network through a direct-current transformer, so that the power supply reliability is further improved;
(5) The dandelion power distribution network realizes the safe power supply of the low-voltage alternating-current power network and the medium-voltage alternating-current power network in the current level power grid and the cross-level power grid by constructing a direct-current power network, and meets the safety power supply of at least 'N-1' in an overhaul mode and a fault mode;
(6) The dandelion power distribution network improves the bearing capacity of an alternating-current distributed power supply and a charging load by constructing a low-voltage and medium-voltage direct-current power network.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of a seed power unit of the present invention;
fig. 2 is a schematic topology of the present invention.
Detailed Description
As shown in the figure, the networking method of the dandelion type power distribution network comprises more than one power supply unit; the power supply unit comprises a low-voltage direct-current power network and more than one seed power supply unit connected with the low-voltage direct-current power network through a power receiving end; the seed power supply unit comprises a low-voltage alternating current-direct current conversion device for converting direct current received by a power receiving end into alternating current, and a power transmitting end of the low-voltage alternating current-direct current conversion device is connected with more than one power receiving end of a low-voltage alternating current power network; the power receiving end of the low-voltage direct-current power network of the power supply unit is connected with the power transmitting end of the medium-voltage direct-current power network through a direct-current transformer; the power receiving end of the medium-voltage direct-current power network is connected with the power transmitting end of more than one medium-voltage alternating-current power network through a medium-voltage alternating-current and direct-current conversion device;
the dandelion type power distribution network is in a distributed intelligent micro-grid form formed by constructing a direct current public network on the basis of an alternating current power distribution network, and the on-site nearby balance of distributed power resources is realized through the ad hoc network function of the distributed intelligent micro-grid, and the power supply reliability and the bearing capacity are improved.
The low-voltage alternating current power network is a 380 volt low-voltage transformer area or feeder line; the medium-voltage alternating current power network takes a 110 kilovolt or 35 kilovolt transformer substation or a 10 kilovolt switching station or a 10 kilovolt ring website or a 10 kilovolt feeder line as a core node;
the voltage of the low-voltage direct-current power network is 750 volts, namely +/-375 volts, and the low-voltage direct-current power network is used for providing power for direct-current power loads; the voltage of the medium-voltage direct-current power network is 1500 volts, namely +/-375 volts, or 20 kilovolts, namely +/-10 kilovolts;
the low-voltage direct-current power network and the medium-voltage direct-current power network comprise intermittent and random distributed power supplies and charging loads; the intermittent and random distributed power supply and the charging load comprise distributed photovoltaic, electric automobile charging piles or energy storage equipment.
The alternating current side and the direct current side of the seed power supply unit are flexibly switched through grid-connected operation, and can be flexibly networked with other seed power supply units to improve the reliability of power supply;
the seed power supply unit comprises two low-voltage alternating current power networks, wherein the two low-voltage alternating current power networks are electrically connected through a low-voltage alternating current-direct current conversion device and are also connected with the low-voltage direct current power network through the low-voltage alternating current-direct current conversion device.
The topological structure of the low-voltage direct current power network is a chained structure or a looped network structure.
The low-voltage alternating-current-direct-current conversion device comprises 1 direct-current port and 2 alternating-current ports, wherein the circuit topology comprises AC/DC, DC/DC and AC/DC topological forms, and also comprises AC/AC and AC/DC/AC topological forms.
The low-voltage alternating current-direct current conversion device has alternating current power and direct current power conversion functions and is used for realizing bidirectional flow of alternating current power and direct current power.
The topological structure of the medium-voltage direct-current power network comprises a chained structure or a looped network structure.
The direct current transformer connected with the low-voltage direct current power network and the medium-voltage direct current power network has a direct current voltage control function and is used for realizing power bidirectional flow between the low-voltage direct current power network and the medium-voltage direct current power network;
the topology of the dc transformer includes a double active full bridge converter and a step-up dc transformer.
The medium voltage alternating current-direct current conversion device connected with the medium voltage direct current power network and the medium voltage alternating current power network has alternating current power and direct current power conversion functions and is used for realizing power bidirectional flow between the medium voltage direct current power network and the medium voltage alternating current power network.
The direct current public network is a direct current power network for realizing safe power supply of the low-voltage alternating current power network and the medium-voltage alternating current power network in the current level power network and the cross-level power network, and the direct current public network meets the requirement of safe power supply of at least 'N-1' in an overhaul mode and a fault mode.
Examples:
as shown in fig. 1, the seed power supply unit of the dandelion power distribution network provided by the invention consists of 2 low-voltage transformer areas or feeder lines. Fig. 2 is a schematic diagram of a dandelion power distribution network of the present invention, including 2 power supply units, 1 low-voltage dc power network, 2 medium-voltage ac power networks, and 1 medium-voltage dc power network. In the dandelion type power distribution network, each power supply unit consists of 5 seed power supply units; each power supply unit is connected through a medium voltage direct current power network.
The low-voltage alternating current power network is generally a 380 volt low-voltage transformer area or feeder; the medium voltage ac power network generally uses 110 kv or 35 kv transformer substation or 10 kv switchyard or 10 kv ring website or 10 kv feeder line as core node.
The seed power supply unit of the dandelion power distribution network generally consists of 2 low-voltage alternating current power networks and is electrically connected through a low-voltage alternating current-direct current conversion device. The voltage of the low voltage dc power network is typically 750 volts (+ -375 volts). And the low-voltage alternating-current and direct-current conversion device is connected with a low-voltage direct-current power network. In general, the low-voltage direct current power network may be a chain structure, and a ring network structure may be adopted to improve the capacity and reliability of the low-voltage direct current power network.
The low voltage ac-dc conversion device has 3 ports including 1 dc port and 2 ac ports. The circuit topology of the low-voltage alternating-current-direct-current conversion device comprises: (1) AC/DC, DC/DC, topology of AC/DC; (2) topological forms of AC/AC, AC/DC/AC. The low-voltage AC/DC conversion device has the functions of AC power conversion and DC power conversion, and can realize the bidirectional flow of power.
The low-voltage direct-current power network of the dandelion power distribution network power supply unit is connected with the medium-voltage direct-current power network through a direct-current transformer. The dc transformer topology includes a double active full bridge converter, a step-up dc transformer, etc. The direct current transformer has a direct current voltage control function and can realize power bidirectional flow.
The voltage of the medium voltage dc power network is typically 1500 volts (+ -375 volts), 20 kilovolts (+ -10 kilovolts). In general, the medium voltage direct current power network may be a chain structure, and in order to improve the capacity and reliability of the medium voltage direct current network, a ring network structure may be adopted.
The medium voltage ac power network is connected to the medium voltage dc power network by means of a medium voltage ac-dc conversion device. The medium-voltage alternating-current and direct-current conversion device has alternating-current power and direct-current power conversion functions, and can realize power bidirectional flow.
In this example, when the seed power supply unit of the dandelion power distribution network cannot obtain power from the low-voltage direct-current power network, the low-voltage alternating-current/direct-current conversion device is connected to the low-voltage alternating-current/direct-current conversion devices of other seed power supply units to obtain power.
In this example, the multiple seed power supply units of the dandelion power distribution network simultaneously acquire electric energy from one low-voltage direct-current power network to form a network topology such as dandelion seed crown hair, and the multiple low-voltage direct-current power networks simultaneously acquire electric energy from one medium-voltage direct-current power network to form a network topology such as dandelion flower stand.
While the invention has been described with respect to the preferred embodiments, it should be noted that modifications and variations can be made by those skilled in the art without departing from the principles of the invention, and such modifications and variations are also considered to be within the scope of the invention.
The patent is not limited to the best mode, any person can obtain other various forms of dandelion distribution networks under the teaching of the patent, and all equivalent changes and modifications made according to the application scope of the invention are covered by the patent.
Claims (10)
1. A networking method of a dandelion type power distribution network is characterized by comprising the following steps of: the power distribution network comprises more than one power supply unit; the power supply unit comprises a low-voltage direct-current power network and more than one seed power supply unit connected with the low-voltage direct-current power network through a power receiving end; the seed power supply unit comprises a low-voltage alternating current-direct current conversion device for converting direct current received by a power receiving end into alternating current, and a power transmitting end of the low-voltage alternating current-direct current conversion device is connected with more than one power receiving end of a low-voltage alternating current power network; the power receiving end of the low-voltage direct-current power network of the power supply unit is connected with the power transmitting end of the medium-voltage direct-current power network through a direct-current transformer; the power receiving end of the medium-voltage direct-current power network is connected with the power transmitting end of more than one medium-voltage alternating-current power network through a medium-voltage alternating-current and direct-current conversion device;
the dandelion type power distribution network is in a distributed intelligent micro-grid form formed by constructing a direct current public network on the basis of an alternating current power distribution network, and the on-site nearby balance of distributed power resources is realized through the ad hoc network function of the distributed intelligent micro-grid, and the power supply reliability and the bearing capacity are improved.
2. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the low-voltage alternating current power network is a 380 volt low-voltage transformer area or feeder line; the medium-voltage alternating current power network takes a 110 kilovolt or 35 kilovolt transformer substation or a 10 kilovolt switching station or a 10 kilovolt ring website or a 10 kilovolt feeder line as a core node;
the voltage of the low-voltage direct-current power network is 750 volts, namely +/-375 volts, and the low-voltage direct-current power network is used for providing power for direct-current power loads; the voltage of the medium-voltage direct-current power network is 1500 volts, namely +/-375 volts, or 20 kilovolts, namely +/-10 kilovolts;
the low-voltage direct-current power network and the medium-voltage direct-current power network comprise intermittent and random distributed power supplies and charging loads; the intermittent and random distributed power supply and the charging load comprise distributed photovoltaic, electric automobile charging piles or energy storage equipment.
3. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the alternating current side and the direct current side of the seed power supply unit are flexibly switched through grid-connected operation, and can be flexibly networked with other seed power supply units to improve the reliability of power supply;
the seed power supply unit comprises two low-voltage alternating current power networks, wherein the two low-voltage alternating current power networks are electrically connected through a low-voltage alternating current-direct current conversion device and are also connected with the low-voltage direct current power network through the low-voltage alternating current-direct current conversion device.
4. A networking method of a dandelion type power distribution network according to claim 3, wherein: the topological structure of the low-voltage direct current power network is a chained structure or a looped network structure.
5. A networking method of a dandelion type power distribution network according to claim 3, wherein: the low-voltage alternating-current-direct-current conversion device comprises 1 direct-current port and 2 alternating-current ports, wherein the circuit topology comprises AC/DC, DC/DC and AC/DC topological forms, and also comprises AC/AC and AC/DC/AC topological forms.
6. The networking method of the dandelion type power distribution network according to claim 5, wherein the networking method comprises the following steps: the low-voltage alternating current-direct current conversion device has alternating current power and direct current power conversion functions and is used for realizing bidirectional flow of alternating current power and direct current power.
7. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the topological structure of the medium-voltage direct-current power network comprises a chained structure or a looped network structure.
8. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the direct current transformer connected with the low-voltage direct current power network and the medium-voltage direct current power network has a direct current voltage control function and is used for realizing power bidirectional flow between the low-voltage direct current power network and the medium-voltage direct current power network;
the topology of the dc transformer includes a double active full bridge converter and a step-up dc transformer.
9. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the medium voltage alternating current-direct current conversion device connected with the medium voltage direct current power network and the medium voltage alternating current power network has alternating current power and direct current power conversion functions and is used for realizing power bidirectional flow between the medium voltage direct current power network and the medium voltage alternating current power network.
10. The networking method of the dandelion type power distribution network according to claim 1, wherein the networking method comprises the following steps: the direct current public network is a direct current power network for realizing safe power supply of the low-voltage alternating current power network and the medium-voltage alternating current power network in the current level power network and the cross-level power network, and the direct current public network meets the requirement of safe power supply of at least 'N-1' in an overhaul mode and a fault mode.
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| CN202311114383.0A CN117200361A (en) | 2023-08-31 | 2023-08-31 | Networking method of dandelion type power distribution network |
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