CN109193801A - Alternating current-direct current mixing power distribution network group network system and its control method - Google Patents
Alternating current-direct current mixing power distribution network group network system and its control method Download PDFInfo
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- CN109193801A CN109193801A CN201811064764.1A CN201811064764A CN109193801A CN 109193801 A CN109193801 A CN 109193801A CN 201811064764 A CN201811064764 A CN 201811064764A CN 109193801 A CN109193801 A CN 109193801A
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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
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of alternating current-direct current mixing power distribution network group network system and its control methods, the system includes: the modular solid-state transformer of 2 or more interconnections, and the modular solid-state transformer has middle pressure AC port, middle straightening flow port, low-voltage alternating-current port and low-voltage direct port；It is interconnected between different modular solid-state transformers by medium pressure DC port.Pass through the control to each port power of modular solid-state transformer, alternating current-direct current mixing power distribution network can be made to have multiple-working mode, to realize the flexible access of a plurality of types of distributed generation resources and load, it completes that tidal current between network is adjusted, power mutually help, new energy consumption, the functions such as power quality controlling, constructs the stronger alternating current-direct current of applicability and mix distribution system.
Description
Technical field
The present invention relates to power electronics fields, and in particular, to alternating current-direct current mixing power distribution network group network system and its control
Method processed.
Background technique
Often the form of power supply accesses power distribution network to renewable energy in a distributed manner, is converted into electric energy supply terminal user.So
And the operational mode of conventional electrical distribution net is substantially dominated with supplier, based on single radial power supply, one secondary control equipment of distribution
(Loading voltage regulator, interconnection switch etc.) ability of regulation and control shortcoming.Match when accordingly, it is difficult to meet renewable energy and load frequent fluctuation
The high-precision real time execution of power grid optimizes demand.In addition, in the planning and designing stage of distribution and operational management, traditional distribution
Mode does not consider the access of distributed generation resource.
With being continuously increased for distributed generation resource access amount, energy storage and controllable burden persistently increase, existing Distribution Network Frame
Structure has been difficult to meet new energy consumption, flexible modulation and user to the requirement such as environmental protection, power supply reliability, power quality.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of alternating current-direct current mixing power distribution network group network system and
Its control method.
In a first aspect, the present invention provides a kind of alternating current-direct current mixing power distribution network group network system, comprising: 2 or more interconnections
Modular solid-state transformer, the modular solid-state transformer has middle pressure AC port, middle straightening flow port, low-voltage alternating-current
Port and low-voltage direct port；It is interconnected between different modular solid-state transformers by medium pressure DC port；Wherein:
Each modular solid-state transformer includes: multi-level converter, double active bridging parallel operations, three phase full bridge inversion
Device；The input terminal of the multi-level converter presses AC port in constituting, and presses in the output end composition of the multi-level converter
DC port, and the input terminal of the middle straightening flow port of multi-level converter composition and double active bridging parallel operations is electrically connected
It connects, the output end of double active bridging parallel operations constitutes low-voltage direct port；The input terminal of the three-phase full-bridge inverter and institute
The output end electrical connection of double active bridging parallel operations is stated, the output end of the three-phase full-bridge inverter constitutes low-voltage alternating-current port.
Optionally, double active bridging parallel operations are the double active bridging parallel operations of isolated form, double active bridging parallel operations
Input terminal is the cascade three-level structure of half-bridge, and the exchange side of double active bridging parallel operations concatenates isolation capacitance, the isolation
Capacitor is used for the DC component being isolated in three level output voltages；The output end of double active bridging parallel operations is full bridge structure；
Wherein, the output end of double active bridging parallel operations in disparate modules solid-state transformer is in parallel, to form low-voltage direct mother
Line.
Optionally, the input terminal of the multi-level converter is the cascade three-level structure of half-bridge.
Optionally, the middle pressure AC port of the modular solid-state transformer and the electrical connection of local AC distribution net；
The low-voltage alternating-current port of the modular solid-state transformer and user's AC load, diesel engine, in small-sized fan
It is any, or appoint more electrical connections；
The low-voltage direct port of the modular solid-state transformer and low profile photovoltaic, small-sized energy storage device, user's direct current are negative
Any in lotus, or appoint more electrical connections；
The middle straightening flow port of the modular solid-state transformer is used to interconnect with other modular solid-state transformers, with
Straightening flow network in formation；
Medium pressure DC network be used for any in large scale industry DC load, photovoltaic plant, energy-accumulating power station, or
Appoint more electrical connections.
Second aspect, the present invention provide a kind of control method of alternating current-direct current mixing power distribution network group network system, are applied to first
Alternating current-direct current mixing power distribution network group network system described in any one of aspect, which comprises
By control the pressure AC port, middle straightening flow port, low-voltage alternating-current port of the modular solid-state transformer with
And the power of low-voltage direct port, so that the modular solid-state transformer station high-voltage side bus is under following either mode:
Between tide optimization operational mode, net power mutually help operational mode, new energy consumption operational mode, power quality controlling
Mode, AC distribution net failure operation mode, DC distribution net failure operation mode.
Optionally,
The tide optimization operational mode refers to: it is optimal for target with line loss, the modular solid-state transformer is formed
Alternating current-direct current mixing power distribution network group network system carry out power scheduling；
Power operational mode of mutually helping refers between the net: in peak times of power consumption, the friendship that modular solid-state transformer is constituted
Electric energy in stream power distribution network is exported by middle straightening flow port into the AC distribution net of overload；
The new energy consumption operational mode refers to: the fluctuating power of modular solid-state transformer is passed through middle pressure DC terminal
Mouth is exported to other modular solid-state transformers；
The power quality controlling mode refers to: the only offer reactive power of modular solid-state transformer；
The AC distribution net failure operation mode refers to: when there is AC distribution net failure, by other normal operations
Modular solid-state transformer provide electric energy；
The DC distribution net failure operation mode refers to: when the middle pressure DC side power of modular solid-state transformer is 0,
Direct current energy is provided from new energy and energy storage device to user load.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Alternating current-direct current mixing power distribution network group network system provided by the invention and its control method pass through setting 2 or more
The modular solid-state transformer of interconnection, wherein the modular solid-state transformer have middle pressure AC port, middle straightening flow port,
Low-voltage alternating-current port and low-voltage direct port；It is mutual by medium pressure DC port between different modular solid-state transformers
Connection.By the control to each port power of modular solid-state transformer, alternating current-direct current mixing power distribution network can be made to have a variety of
Operating mode, to realize the flexible access of a plurality of types of distributed generation resources and load, completion tidal current between network is adjusted, power is mutual
The functions such as Ji, new energy consumption, power quality controlling construct the stronger alternating current-direct current mixing distribution system of applicability.Effectively mention
The high performance driving economy of distribution system, improves the new energy access capability of distribution system, the power supply for improving user is reliable
Property.It is formed by multiple network ports, can be used for accessing different types of user, new energy, energy storage device, effectively reduces
Multi-stage transformation link improves comprehensive energy utilization rate and running efficiency of system.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the schematic illustration for the modular solid-state transformer that one embodiment of the invention provides；
Fig. 2 is that the alternating current-direct current mixing power distribution network networking principle based on modular solid-state transformer is shown in one embodiment of the invention
It is intended to；
Fig. 3 is to transport used by the alternating current-direct current mixing power distribution network based on modular solid-state transformer in one embodiment of the invention
Row pattern diagram.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Fig. 1 is the schematic illustration for the modular solid-state transformer that one embodiment of the invention provides, as shown in Figure 1, module
Change solid-state transformer by Modular multilevel converter (abbreviation MMC), the double active bridging parallel operations (abbreviation DAB) of multiple isolated forms with
And three-phase full-bridge inverter is constituted, wherein the double active bridges of the submodule (abbreviation SM) and isolated form of Modular multilevel converter
Converter interconnection, the double active bridging parallel operation input terminals of the submodule and isolated form of Modular multilevel converter are all made of half-bridge stage
Join the structure of three level, to reduce required module number and high frequency transformer quantity, the double active bridging parallel operations exchanges of isolated form
DC component of the side serial capacitance to be isolated in three level output voltages, and the double active bridge converter output terminal converters of isolated form
Using full bridge structure, low-voltage direct bus, three phase full bridge are formed by the double active bridge converter output terminal parallel connections of multiple isolated forms
Inverter connects on low-voltage direct bus, and forms low-voltage alternating-current port.
Specifically, shown in the detail view of module topology as shown in figure 1 based on three level of half-bridge cascade connection type, half-bridge cascade connection type three
Level is composed by the half-bridge sub-module cascade of MMC, the exportable three-level AC galvanic electricity pressure of AC port, and DC port
Twice of capacitance voltage can be then exported, in the present invention, three level of half-bridge cascade connection type is for MMC submodule and DAB input side, and two
Person can realize interconnection by the DC port of the topology, and for isolated DC component, three electricity of half-bridge cascade connection type of DAB input side
Its outlet is put down by serial capacitance.
In the present embodiment, which is matched by pressure exchange in Modular multilevel converter realization first
The interconnection of power grid and middle straightening stream power distribution network has secondly by the submodule unit and isolated form of Modular multilevel converter are double
The connection of source bridging parallel operation, realizes the interconnection of middle-voltage network and low-voltage direct power distribution network, finally by three-phase full-bridge inverter, realizes
The interconnection of low-voltage direct power distribution network and low-voltage alternating-current power distribution network.By the application of this topology, it can be achieved that Power System Interconnection, is multivoltage
Equipment basis is laid in the networking of the alternating current-direct current mixing power distribution network of grade.
Fig. 2 is that the alternating current-direct current mixing power distribution network networking principle based on modular solid-state transformer is shown in one embodiment of the invention
It is intended to；As shown in Fig. 2, being the alternating current-direct current mixing power distribution network network-building method based on modular solid-state transformer.Modular solid-state becomes
The middle pressure AC port of depressor is connected with middle pressure AC distribution net；Low-voltage alternating-current port then forms low-voltage alternating-current bus, and access is originally
Ground AC load, diesel-driven generator, small-sized fan；Low-voltage direct port then forms low-voltage direct bus, and it is negative to access local direct current
Lotus, photovoltaic and energy storage device；Middle straightening flow port then formed in straightening stream power distribution network and multiple modular solid-state transformers it is mutual
Connection, and straightening stream load, photovoltaic plant, energy-accumulating power station etc. in access.By the power control of multiple modular solid-state transformers,
The power interaction that multizone network can be achieved realizes that the networking of alternating current-direct current mixing power distribution network and optimization are run.
It, can be based on the association of multiple modular solid-state transformers for alternating current-direct current mixing power distribution network networking plan shown in Fig. 2
Regulation system realizes that power distribution network is flexibly run, and plurality of operating modes is as shown in Figure 3.
(1) tide optimization operational mode rationally realizes power scheduling according to the power generation of new energy and load electricity consumption situation.
Local low-voltage customer can pass through new energy, energy storage device, middle pressure AC distribution net, multiple power supplys and the electricity such as middle straightening stream power distribution network
Net power supply.
Specifically, when operating normally, system work is sent out in tide optimization mode according to real-time load electricity consumption and new energy
Electric situation, it is optimal for target with line loss using the flexible power control ability of modular solid-state transformer, realize tide optimization control
System.On the basis of ensuring power-balance, the economy of system operation is improved.
(2) other are lightly loaded by power operational mode of mutually helping by the power control of multiple modular solid-state transformers between net
AC distribution net electric energy by middle pressure DC bus turn be supplied on the power grid, realization power mutually help.
Specifically, in peak times of power consumption, local power distribution network will appear overload or overload, and distribution system is switched to net at this time
Between power mutually help mode, i.e., share load duty equally by other AC distribution nets, pass through middle pressure DC bus and realize power interaction
With load transfer, thus the period avoid overload with overload phenomenon appearance.
(3) new energy consumption operational mode is passed fluctuating power by the power control of multiple modular solid-state transformers
It passs other multiple networks to share, so that smooth power, improves local quality of voltage, improve new energy digestion capability.
Specifically, at generation of electricity by new energy peak period, local power distribution network will appear the problem of digestion capability deficiency, lead to this
The fluctuation of ground power distribution network emergent power and quality of voltage problem, distribution system is switched to new energy consumption mode, new energy wave at this time
Dynamic power will pass to other power distribution networks by middle pressure DC bus and carry out sharing consumption equally, to improve entire distribution system pair
The digestion capability of new energy.
(4) power quality controlling mode, only middle pressure AC distribution net and low-voltage alternating-current power distribution network provide reactive power, real
Existing power quality controlling function.
Specifically, when local low-pressure side power distribution network is self-sufficient, middle pressure AC or DC power distribution network power supply is not needed, this
When distribution system be power quality controlling mode, modular solid-state transformer will only be it is middle pressure and low-voltage alternating-current power distribution network provide nothing
Power quality controlling is realized in the support of function power, and without the interaction of internetwork active power.
(5) AC distribution net failure operation mode passes through modular solid-state if local secondary network electric energy is insufficient at this time
Electric energy needed for local critical load is shared equally and gives other ac distribution networks by the power control of transformer, to guarantee user
Power supply reliability.
(6) DC distribution net failure operation mode can control the middle pressure DC side power of modular solid-state transformer at this time
It is 0, each local secondary network customer charge realizes power supply by new energy, energy storage and AC distribution net.The confession of user is not influenced
Electric reliability.
The present invention passes through the webbed multi-voltage grade alternating current-direct current mixing power distribution architecture of solid-state transformer shape.Solid-state transformer
At the central node of polymorphic type distribution network, traditional distribution transformer will be replaced, need to meet multiport, high no-load voltage ratio,
The primary demands such as multivoltage form, Fault Isolation, the transmission of efficient electric energy, and realize that multidirectional power is controllable, a variety of insert i.e. is provided
With Premium Features such as interfaces.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (6)
1. a kind of alternating current-direct current mixing power distribution network group network system characterized by comprising the modularization of 2 or more interconnections is solid
State transformer, the modular solid-state transformer have middle pressure AC port, middle straightening flow port, low-voltage alternating-current port and low
Straightening flow port；It is interconnected between different modular solid-state transformers by medium pressure DC port；Wherein:
Each modular solid-state transformer includes: multi-level converter, double active bridging parallel operations, three-phase full-bridge inverter；
The input terminal of the multi-level converter presses AC port, straightening stream in the output end composition of the multi-level converter in constituting
Port, and the middle straightening flow port that the multi-level converter is constituted is electrically connected with the input terminal of double active bridging parallel operations,
The output end of double active bridging parallel operations constitutes low-voltage direct port；The input terminal of the three-phase full-bridge inverter and described double
The output end of active bridging parallel operation is electrically connected, and the output end of the three-phase full-bridge inverter constitutes low-voltage alternating-current port.
2. alternating current-direct current mixing power distribution network group network system according to claim 1, which is characterized in that double active bridgings change
Device is the double active bridging parallel operations of isolated form, and the input terminal of double active bridging parallel operations is the cascade three-level structure of half-bridge, institute
The exchange side concatenation isolation capacitance of double active bridging parallel operations is stated, the isolation capacitance is straight in three level output voltages for being isolated
Flow component；The output end of double active bridging parallel operations is full bridge structure；Wherein, described in disparate modules solid-state transformer
The output end of double active bridging parallel operations is in parallel, to form low-voltage direct bus.
3. alternating current-direct current mixing power distribution network group network system according to claim 1, which is characterized in that the multi-level converter
Input terminal be the cascade three-level structure of half-bridge.
4. alternating current-direct current mixing power distribution network group network system according to claim 1, which is characterized in that the modular solid-state becomes
The middle pressure AC port of depressor and the electrical connection of local AC distribution net；
The low-voltage alternating-current port of the modular solid-state transformer and any in user's AC load, diesel engine, small-sized fan,
Or appoint more electrical connections；
The low-voltage direct port of the modular solid-state transformer and low profile photovoltaic, small-sized energy storage device, in user's DC load
Any, or appoint more electrical connections；
The middle straightening flow port of the modular solid-state transformer is used to interconnect with other modular solid-state transformers, to be formed
Middle straightening flow network；
Medium pressure DC network be used for any in large scale industry DC load, photovoltaic plant, energy-accumulating power station, or appoint it is more
Electrical connection.
5. a kind of control method of alternating current-direct current mixing power distribution network group network system, which is characterized in that be applied to appoint in claim 1-4
Alternating current-direct current mixing power distribution network group network system described in one, which comprises
By controlling the pressure AC port of the modular solid-state transformer, middle straightening flow port, low-voltage alternating-current port and low
The power of straightening flow port, so that the modular solid-state transformer station high-voltage side bus is under following either mode:
Between tide optimization operational mode, net power mutually help operational mode, new energy consumption operational mode, power quality controlling mould
Formula, AC distribution net failure operation mode, DC distribution net failure operation mode.
6. the control method of alternating current-direct current mixing power distribution network group network system according to claim 5, which is characterized in that
The tide optimization operational mode refers to:, friendship to modular solid-state transformer composition optimal for target with line loss
Direct current mixing power distribution network group network system carries out power scheduling；
Power operational mode of mutually helping refers between the net: in peak times of power consumption, the exchange that modular solid-state transformer is constituted being matched
Electric energy in power grid is exported by middle straightening flow port into the AC distribution net of overload；
The new energy consumption operational mode refers to: the fluctuating power of modular solid-state transformer is defeated by middle straightening flow port
Out to other modular solid-state transformers；
The power quality controlling mode refers to: the only offer reactive power of modular solid-state transformer；
The AC distribution net failure operation mode refers to: when there is AC distribution net failure, by the mould of other normal operations
Block solid-state transformer provides electric energy；
The DC distribution net failure operation mode refers to: when the middle pressure DC side power of modular solid-state transformer is 0, by new
The energy and energy storage device provide direct current energy to user load.
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| CN201811064764.1A CN109193801A (en) | 2018-09-12 | 2018-09-12 | Alternating current-direct current mixing power distribution network group network system and its control method |
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| CN110492514A (en) * | 2019-07-04 | 2019-11-22 | 上海交通大学 | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network |
| CN110601273A (en) * | 2019-08-23 | 2019-12-20 | 广东电网有限责任公司珠海供电局 | Three-terminal flexible direct-current power distribution network topology system |
| CN112557704A (en) * | 2020-12-02 | 2021-03-26 | 国网浙江省电力有限公司电力科学研究院 | Alternating current-direct current series-parallel connection power distribution network frame capable of being flexibly configured and true type test system |
| CN112653203A (en) * | 2020-12-22 | 2021-04-13 | 天津大学 | AC/DC hybrid power grid based on solid-state transformer and coordination control method thereof |
| CN113708409A (en) * | 2021-08-27 | 2021-11-26 | 上海交通大学 | Offshore wind power conversion method and system based on modular solid-state transformer |
| CN115498664A (en) * | 2022-09-28 | 2022-12-20 | 国网浙江省电力有限公司杭州供电公司 | Hydrogen-electricity coupling comprehensive energy system combined with flexible direct-current power distribution network |
| CN116885969A (en) * | 2023-09-07 | 2023-10-13 | 西安为光能源科技有限公司 | AC/DC electric energy conversion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492514A (en) * | 2019-07-04 | 2019-11-22 | 上海交通大学 | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network |
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| CN112653203A (en) * | 2020-12-22 | 2021-04-13 | 天津大学 | AC/DC hybrid power grid based on solid-state transformer and coordination control method thereof |
| CN112653203B (en) * | 2020-12-22 | 2023-05-30 | 天津大学 | AC/DC hybrid power grid based on solid-state transformer and coordination control method thereof |
| CN113708409A (en) * | 2021-08-27 | 2021-11-26 | 上海交通大学 | Offshore wind power conversion method and system based on modular solid-state transformer |
| CN113708409B (en) * | 2021-08-27 | 2023-09-12 | 上海交大知识产权管理有限公司 | Marine wind power conversion method and system based on modularized solid-state transformer |
| CN115498664A (en) * | 2022-09-28 | 2022-12-20 | 国网浙江省电力有限公司杭州供电公司 | Hydrogen-electricity coupling comprehensive energy system combined with flexible direct-current power distribution network |
| CN116885969A (en) * | 2023-09-07 | 2023-10-13 | 西安为光能源科技有限公司 | AC/DC electric energy conversion system |
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