CN109687433A - A kind of flexibility substation structure - Google Patents
A kind of flexibility substation structure Download PDFInfo
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- CN109687433A CN109687433A CN201811507683.4A CN201811507683A CN109687433A CN 109687433 A CN109687433 A CN 109687433A CN 201811507683 A CN201811507683 A CN 201811507683A CN 109687433 A CN109687433 A CN 109687433A
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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
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of flexible substation structures, it include: high-voltage rectifying unit, high voltage dc bus and at least one first low-voltage load unit, the input terminal of high-voltage rectifying unit is connect with power distribution network high-pressure side, output end is connect with high voltage dc bus, and High Level AC Voltage is converted to high voltage direct current；High voltage dc bus is made of multiple energy storage capacitor in series, and storage capacitor stores high voltage direct current, and is powered for the first low-voltage load unit；First low-voltage load unit include: connect local distributed generation resource the first load unit and at least one be not connected to local distributed generation resource the second load unit；First load unit is correspondingly arranged with an at least storage capacitor, and the first load unit connect identical storage capacitor with the second load unit.It realizes and is powered for the load of multiple DC voltage levels, and realize to local distributed generation resource providing auxiliary power amount energy storage, avoid energy waste, and distribution feeder terminal voltage can be prevented out-of-limit, ensure terminal temperature difference safety.
Description
Technical field
The present invention relates to flexible distribution technique fields, and in particular to a kind of flexibility substation structure.
Background technique
Along with the fast development of load, distributed energy and electric car in power distribution network, traditional distribution net work structure with
The problems such as control methods face huge challenge, feeder line power imbalances, transformer heavy-overload, difficult city power transmission and distribution increase-volume is increasingly prominent
Out.
Traditional power distribution network generallys use radial structure, although increasing interconnection switch and block switch, mostly
Closed loop design open loop operation.Traditional substation does not have the power flow regulating ability of active, in reply distributed energy and electronic
Existing defects when the problems such as automobile.Local distributed generation resource is flanked in low-voltage load into the local distributed electrical such as solar power generation
Source, it is extra caused by local distributed generation resource when the generated energy of local distributed generation resource is more than local load demand
Electricity can not consume, it may occur that abandon electrical phenomena, cause energy waste problem.Local distributed generation resource super generating and randomness wave simultaneously
The dynamic problem that also terminal voltage can be caused out-of-limit, to influence power distribution network terminal temperature difference safety.
Summary of the invention
The embodiment of the invention provides a kind of flexible substation structures, to overcome substation in the prior art can not be to straight
Stream load and distributed generation unit are regulated and controled, and are easy to happen abandoning electrical phenomena, cause the waste of the energy, while easily causing
The out-of-limit problem of terminal voltage.
The embodiment of the invention provides a kind of flexible substation structures, comprising: high-voltage rectifying unit, high voltage dc bus and
At least one first low-voltage load unit, wherein the input terminal of the high-voltage rectifying unit is connect with power distribution network high-pressure side, output end
It is connect with the high voltage dc bus, the high-voltage rectifying unit is used to High Level AC Voltage being converted to high voltage direct current；It is described
High voltage dc bus is made of multiple energy storage capacitor in series, the storage capacitor for storing the high voltage direct current, and for
The first low-voltage load unit that the storage capacitor is correspondingly connected with is powered；The first low-voltage load unit includes:
At least one for connecting the first load unit of local distributed generation resource and being correspondingly arranged with first load unit is not connected to this
Second load unit of ground distributed generation resource；First load unit and the energy storage mould being made of at least one storage capacitor
Block is arranged in a one-to-one correspondence, and first load unit connect the same energy-storage module with second load unit.
Optionally, first load unit includes: the first isolated converter, the first inverter, the first load, wherein
The input terminal of first isolated converter is connect with the energy-storage module, for the high voltage direct current to be converted to low-pressure direct
Galvanic electricity；The input terminal of first inverter is connect with the output end of first isolated converter, output end and described first
Load connection is first load supplying for the low-voltage DC to be converted to low-voltage AC；The local distribution
The output end of formula power supply is connect with first inverter, for being first load supplying.
Optionally, second load unit includes: the second isolated converter, the second inverter, the second load, wherein
The input terminal of second isolated converter is connect with the energy-storage module, for the high voltage direct current to be converted to low-pressure direct
Galvanic electricity；The input terminal of second inverter is connect with the output end of second isolated converter, output end and described second
Load connection is second load supplying for the low-voltage DC to be converted to low-voltage AC.
Optionally, when the generated energy of the local distributed generation resource is more than the default power consumption of first load, institute
The generated energy for stating local distributed generation resource is transmitted to the energy storage by first inverter and first isolated converter
Each storage capacitor in module.
Optionally, the high-voltage rectifying unit is modularization multi-level converter.
Optionally, the modularization multi-level converter is by multiple bridge-type submodules and/or multiple clamper type Shuangzi moulds
Block and/or multiple half-bridge submodules are constituted.
Optionally, the high voltage dc bus further include: the equalizer circuit being arranged in a one-to-one correspondence with the storage capacitor, institute
State the voltage value that equalizer circuit is in parallel with the storage capacitor, for the balanced storage capacitor.
Optionally, the equalizer circuit includes: dynamic voltage-balancing, static state voltage equipoise circuit and equalizer switch, wherein described
Dynamic voltage-balancing includes: first resistor and first capacitor, and the first resistor and the first capacitor are connected；It is described static equal
Volt circuit includes: second resistance, is connected again after the second resistance is in parallel with the dynamic voltage-balancing with the equalizer switch
It is in parallel with the storage capacitor.
Optionally, the flexible substation structure further include: at least one is not connected to the second low pressure of local distributed generation resource
Load unit, the second low-voltage load unit are set with the energy-storage module one-to-one correspondence being made of at least one storage capacitor
It sets；The energy-storage module is connect with the second low-voltage load unit, for being powered for the second low-voltage load unit.
Optionally, the flexible substation structure further include: at least one third low pressure for connecting local distributed generation resource is born
Carrier unit, the third low-voltage load unit are set with the energy-storage module one-to-one correspondence being made of at least one storage capacitor
It sets；The energy-storage module is connect with the third low-voltage load unit, for being powered for the third low-voltage load unit.
Technical solution of the present invention has the advantages that
The embodiment of the invention provides a kind of flexible substation structure, including high-voltage rectifying unit, high voltage dc bus and
At least one first low-voltage load unit, the first low-voltage load unit include the first load unit and at least one second load unit,
First load unit is commonly connected to being made of on high voltage dc bus an at least storage capacitor with each second load unit
Energy-storage module, be powered to be realized by the energy-storage module for the load of multiple voltage levels direct currents, and the energy storage
Module, which is also achieved, carries out energy storage for the extra generated energy of the local distributed generation resource of the first load unit connection, both avoids energy
The waste in source, and terminal voltage can be effectively prevent out-of-limit, ensure the safety of terminal temperature difference.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of flexible substation structure in the embodiment of the present invention；
Fig. 2 is another schematic diagram of flexible substation structure in the embodiment of the present invention；
Fig. 3 is another schematic diagram of flexible substation structure in the embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are used for description purposes only,
It is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
The embodiment of the invention provides a kind of flexible substation structures, as shown in Figure 1, the flexibility substation structure includes:
High-voltage rectifying unit 1, high voltage dc bus 2 and the first low-voltage load unit 3, wherein
The input terminal of high-voltage rectifying unit 1 is connect with power distribution network high-pressure side, and output end is connect with high voltage dc bus 2, high
Pressure rectification unit 1 is used to High Level AC Voltage being converted to high voltage direct current；High voltage dc bus 2 is connected by multiple storage capacitor CH
It constitutes, storage capacitor CH is for storing high voltage direct current, and the first low-voltage load unit 3 to be correspondingly connected with storage capacitor CH
It is powered；First low-voltage load unit 3 includes: to connect the first load unit 31 of local distributed generation resource and load with first
Be correspondingly arranged one of unit 31 is not connected to the second load unit 32 of local distributed generation resource；First load unit 31 with by extremely
The energy-storage module M that a few storage capacitor CH is constituted is arranged in a one-to-one correspondence, and the first load unit 31 is connect with the second load unit 32
Same energy-storage module M.It should be noted that being single with the first low-voltage load unit 3 and the second load in embodiments of the present invention
The number of member 32 is the explanation carried out for one, and in practical applications, the first low-voltage load unit 3 and the second load are single
The number of member 32 can be set according to actual needs as 2 or more, and the present invention is not limited thereto.In addition, in this hair
In bright embodiment, the storage capacitor CH in above-mentioned energy-storage module M is 1, and in practical applications, storage capacitor CH can basis
The demand of the affiliated voltage class of above-mentioned first low-voltage load unit 3 is set as multiple, and the present invention is not limited thereto.
Pass through the cooperative cooperating of above-mentioned each component part, the flexible substation structure of the embodiment of the present invention, to pass through
Energy-storage module M realizes to be powered for the load of multiple voltage levels direct currents, and energy-storage module M is also achieved first
The generated energy that the local distributed generation resource of load unit connection is extra carries out energy storage, has not only avoided the waste of the energy, but also can be effective
It prevents terminal voltage out-of-limit, ensures the safety of terminal temperature difference.
In a preferred embodiment, as shown in Fig. 2, first load unit 31 includes: the first isolated converter 311,
One inverter 312, first load 313, wherein the input terminal of the first isolated converter 311 is connect with energy-storage module M, and being used for will
High voltage direct current is converted to low-voltage DC；The output end of the input terminal of first inverter 312 and the first isolated converter 311 connects
It connects, output end is connect with the first load 313, is 313 power supply of the first load for low-voltage DC to be converted to low-voltage AC；
The output end of local distributed generation resource is connect with the first inverter 312, for powering for the first load 313.
In practical applications, as shown in Fig. 2, the output end of the first above-mentioned isolated converter 311 is connected with the first isolation
Capacitor CM1, the first above-mentioned inverter 312 is connected to by the first isolation capacitance CM1, and first isolation capacitance CM1 is realized
The effect that the output DC voltage of first isolated converter 311 is filtered.Specifically, which is
Isolated DC-direct current (DC-DC) converter, such as isolated form Buck class DC converter can be used, this quasi-converter includes:
Normal shock is recommended, half-bridge and full-bridge converter.Wherein forward converter includes single tube forward converter and two-transistor forward converter.
Furthermore can also use isolated form Boost class DC converter, this quasi-converter include recommend, half-bridge and full-bridge converter.Every
Release Buck-boost class DC converter, that is, flyback converter, it includes single switch flyback converter and double-transistor flyback converter.
In practical applications, as shown in Fig. 2, the first above-mentioned inverter 312 is three-phase four-leg inverter 3, the three-phase
The three-phase voltage output end of four-leg inverter passes through the first inductance L1 respectively and 313 connect with the first load, the first inductance L1 and
It is grounded after second isolation capacitance CM2 connection, passes through the second inductance L2 between above-mentioned local distributed generation resource and the first load 313
Connection, the local distributed generation resource and first the 313, second isolation capacitance CM2 of load and the first inverter 312 are altogether.Above-mentioned
First inductance L1, the second isolation capacitance CM2 and the second inductance L2, which are realized, is filtered the voltage of the load of access first 313
Effect.
In embodiments of the present invention, the first above-mentioned isolated converter 311 be bidirectional DC-DC converter, above-mentioned first
Inverter 312 is two-way inverter, so that realizing the electric energy that local distributed generation resource generates electricity passes through first inverter 312
The storage capacitor CH being transmitted in above-mentioned energy-storage module M with the first isolated converter 311 is other direct currents by storage capacitor CH
323 power supply of the second load in for example above-mentioned second load unit 32 is loaded, so as to avoid the waste of the energy.
In a preferred embodiment, as shown in Fig. 2, the second above-mentioned load unit 32 includes: the second isolated converter
321, the second inverter 322, second load 323, wherein the input terminal of the second isolated converter 321 is connect with energy-storage module M,
For high voltage direct current to be converted to low-voltage DC；The input terminal of second inverter 322 is defeated with the second isolated converter 321
Outlet connection, output end are connect with the second load 323, are that the second load supplies for low-voltage DC to be converted to low-voltage AC
Electricity.
In practical applications, as shown in Fig. 2, the output end of the second above-mentioned isolated converter 321 is connected with third isolation
Capacitor CM3, the second above-mentioned inverter 322 is connected to by third isolation capacitance CM3, and third isolation capacitance CM3 is realized
The effect that the output DC voltage of second isolated converter 321 is filtered.Specifically, which is
Isolation type DC-DC converter, such as isolated form Buck class DC converter can be used, this quasi-converter includes: normal shock, recommend,
Half-bridge and full-bridge converter.Wherein forward converter includes single tube forward converter and two-transistor forward converter.It furthermore can also be with
Using isolated form Boost class DC converter, this quasi-converter include recommend, half-bridge and full-bridge converter.Isolated form Buck-
Boost class DC converter, that is, flyback converter, it includes single switch flyback converter and double-transistor flyback converter.
In practical applications, as shown in Fig. 2, the second above-mentioned inverter 322 is three-phase four-leg inverter, the three-phase four
The three-phase voltage output end of leg inverter passes through third inductance L3 respectively and 323 connect with the second load, third inductance L3 and the
It is grounded after four isolation capacitance CM4 connections, the second above-mentioned the 323, the 4th isolation capacitance CM4 of load and the second inverter 322 are altogether.
Above-mentioned third inductance L3 and the 4th isolation capacitance CM4 realizes the effect being filtered to the voltage of the load of access second 323.
Specifically, in one embodiment, above-mentioned high-voltage rectifying unit 1 is modularization multi-level converter.The modularization
Multilevel converter has the function of blocking fault current, can rapidly hinder when the failures such as bus-bar fault occur for substation
Disconnected fault current, and then guarantee the safety of substation.The modularization multi-level converter is by multiple bridge-type submodules and/or more
A clamper type Shuangzi module and/or multiple half-bridge submodules are constituted.In practical applications, which can be with
All it is made of bridge-type submodule, can also be all by clamper type Shuangzi module composition, it can also be all by half-bridge submodule
Constitute, can also demand according to the actual situation, according to arbitrary proportion selection bridge-type submodule, clamper type Shuangzi module and half
Bridge submodule collectively forms.
In a preferred embodiment, as shown in Fig. 2, above-mentioned high voltage dc bus 2 further include: one by one with storage capacitor CH
The equalizer circuit 4 being correspondingly arranged, equalizer circuit 4 is in parallel with storage capacitor CH, the voltage value for balanced storage capacitor CH.In reality
In the application of border, influenced by local distributed generation resource or DC load variation, above-mentioned storage capacitor CH may occur
The voltage on automatic equalization storage capacitor CH may be implemented by equalizer circuit 4 in the unbalanced phenomenon of voltage.
Specifically, in one embodiment, as shown in figure 3, above-mentioned equalizer circuit 4 includes: dynamic voltage-balancing 41, static state
Equalizer circuit 42 and equalizer switch K, wherein dynamic voltage-balancing 41 includes: first resistor R1 and first capacitor C1, first resistor
R1 and first capacitor C1 series connection；Static state voltage equipoise circuit 42 includes: second resistance R2, and second resistance R2 and dynamic voltage-balancing 41 are simultaneously
It connects again after connection with equalizer switch K in parallel with storage capacitor CH.The voltage of each storage capacitor CH on high voltage dc bus 2
When occurring unbalanced, it is closed equalizer switch K, energy storage electricity can be realized by static pressure equalizer circuit 42 and/or dynamic voltage-balancing 41
Hold the automatic equalization of CH.
In a preferred embodiment, as shown in figure 3, above-mentioned flexible substation structure, further includes: be not connected to local distribution
Second low-voltage load unit 5 of formula power supply, second low-voltage load unit 5 and the energy-storage module that is made of an at least storage capacitor CH
M is arranged in a one-to-one correspondence；Storage capacitor CH is connect with the second low-voltage load unit 5, for being supplied for the second low-voltage load unit 5
Electricity.In practical applications, the third low-voltage load unit 6 is identical as the structure of above-mentioned second load unit 32, the difference of the two
It is, the second above-mentioned load unit 32 and the first load unit 31 share same energy-storage module M, and the third low-voltage load list
The independent corresponding energy-storage module M connection of member 6.It should be noted that being with second low pressure in embodiments of the present invention
The explanation carried out for load unit 5, in practical applications, which can be according to actual needs
Be set as 2 or more, the present invention is not limited thereto.In addition, in embodiments of the present invention, in above-mentioned energy-storage module M
Storage capacitor CH be 1, in practical applications, storage capacitor CH can be according to the institute of above-mentioned second low-voltage load unit 5
The demand for belonging to voltage class is set as multiple, and the present invention is not limited thereto.
In a preferred embodiment, as shown in figure 3, above-mentioned flexible substation structure, further includes: at least one connection is local
The third low-voltage load unit 6 of distributed generation resource, third low-voltage load unit 6 and the energy storage being made of an at least storage capacitor CH
Module M is arranged in a one-to-one correspondence；Energy-storage module M is connect with third low-voltage load unit 6, for for third low-voltage load unit 6 into
Row power supply.In practical applications, the 4th low-voltage load unit is identical as the structure of above-mentioned first load unit 31, the area of the two
It is not, above-mentioned first load unit 31 and at least one second load unit 32 share same storage capacitor CH, and the 4th
The independent corresponding storage capacitor CH connection of low-voltage load unit.It should be noted that being with one in embodiments of the present invention
The explanation carried out for a third low-voltage load unit 6, in practical applications, which can root
According to actual needs be set as 2 or more, the present invention is not limited thereto.In addition, in embodiments of the present invention, above-mentioned storage
Storage capacitor CH in energy module M is 1, and in practical applications, storage capacitor CH can be according to above-mentioned third low-voltage load
The demand of the affiliated voltage class of unit 6 is set as multiple, and the present invention is not limited thereto.
In practical applications, the control mode of above-mentioned flexible substation structure is divided into: the control of high side voltage source, with steady
Determine the voltage of high voltage dc bus 2；When low-pressure side only contains load, isolation type DC-DC converter and rear end inverter are single
To power flow control, controls and stablize output AC voltage；When low-pressure side contains local distributed generation resource simultaneously, isolated form DC-
DC converter and rear end inverter are bidirectional power flow control, local to be distributed in the case where guaranteeing low-pressure side load voltage situation up to standard
The extra electricity that the power generation of formula power supply generates can flow to each of high voltage dc bus 2 by DC-DC converter and rear end inverter
A storage capacitor CH.
By the cooperative cooperating of above-mentioned each component part, the flexible substation structure of the embodiment of the present invention passes through the storage
Energy module M realizes to be powered for the load of multiple voltage levels direct currents, and energy-storage module M is also achieved the first load
The generated energy that the local distributed generation resource of unit connection is extra carries out energy storage, has not only avoided the waste of the energy, but also can effectively prevent
Terminal voltage is out-of-limit, ensures the safety of terminal temperature difference.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of flexibility substation structure, is characterized in that, comprising: high-voltage rectifying unit (1), high voltage dc bus (2) and at least
One first low-voltage load unit (3), wherein
The input terminal of the high-voltage rectifying unit (1) is connect with power distribution network high-pressure side, output end and the high voltage dc bus (2)
Connection, the high-voltage rectifying unit (1) are used to High Level AC Voltage being converted to high voltage direct current；
The high voltage dc bus (2) is in series by multiple storage capacitors (CH), and the storage capacitor (CH) is for storing institute
High voltage direct current is stated, and to be powered with the first low-voltage load unit (3) that the storage capacitor (CH) is correspondingly connected with；
The first low-voltage load unit (3) include: connect local distributed generation resource the first load unit (31) and with it is described
At least one the second load unit (32) for being not connected to local distributed generation resource that first load unit (31) is correspondingly arranged；
First load unit (31) sets with energy-storage module (M) one-to-one correspondence being made of at least one storage capacitor (CH)
It sets, first load unit (31) connect the same energy-storage module (M) with second load unit (32).
2. flexibility substation structure according to claim 1, which is characterized in that first load unit (31) includes:
First isolated converter (311), the first inverter (312), the first load (313), wherein
The input terminal of first isolated converter (311) is connect with the energy-storage module (M), is used for the high voltage direct current
Be converted to low-voltage DC；
The input terminal of first inverter (312) is connect with the output end of first isolated converter (311), output end with
First load (313) connection is first load (313) for the low-voltage DC to be converted to low-voltage AC
Power supply；
The output end of the local distributed generation resource is connect with first inverter (312), for loading for described first
(313) it powers.
3. flexibility substation structure according to claim 2, which is characterized in that second load unit (32) includes:
Second isolated converter (321), the second inverter (322), the second load (323), wherein
The input terminal of second isolated converter (321) is connect with the energy-storage module (M), is used for the high voltage direct current
Be converted to low-voltage DC；
The input terminal of second inverter (322) is connect with the output end of second isolated converter (321), output end with
Second load (323) connection is second load (323) for the low-voltage DC to be converted to low-voltage AC
Power supply.
4. flexibility substation structure according to claim 3, which is characterized in that
It is described when the generated energy of the local distributed generation resource is more than the default power consumption demand of first load (313)
The generated energy of local distributed generation resource is transmitted to by first inverter (312) and first isolated converter (311)
Each storage capacitor (CH) in the energy-storage module (M).
5. flexibility substation structure according to claim 1, which is characterized in that the high-voltage rectifying unit (1) is module
Change multilevel converter.
6. flexibility substation structure according to claim 5, which is characterized in that the modularization multi-level converter is by more
A bridge-type submodule and/or multiple clamper type Shuangzi modules and/or multiple half-bridge submodules are constituted.
7. flexibility substation structure according to claim 1, which is characterized in that the high voltage dc bus (2) further include:
The equalizer circuit (4) being arranged in a one-to-one correspondence with the storage capacitor (CH), the equalizer circuit (4) and the storage capacitor (CH)
Parallel connection, the voltage value for the balanced storage capacitor (CH).
8. flexibility substation structure according to claim 7, which is characterized in that the equalizer circuit (4) includes: that dynamic is equal
Volt circuit (41), static state voltage equipoise circuit (42) and equalizer switch (K), wherein
The dynamic voltage-balancing (41) includes: first resistor (R1) and first capacitor (C1), the first resistor (R1) and institute
State first capacitor (C1) series connection；
The static state voltage equipoise circuit (42) includes: second resistance (R2), the second resistance (R2) and the dynamic voltage-balancing
(41) it connects again after parallel connection with the equalizer switch (K) in parallel with the storage capacitor (CH).
9. flexibility substation structure according to claim 1, which is characterized in that further include: at least one is not connected to local point
Second low-voltage load unit (5) of cloth power supply, the second low-voltage load unit (5) with by least one storage capacitor
(CH) energy-storage module (M) constituted is arranged in a one-to-one correspondence；
The energy-storage module (M) connect with the second low-voltage load unit (5), for being the second low-voltage load unit
(5) it is powered.
10. flexibility substation structure according to claim 1, which is characterized in that further include: the local distribution of at least one connection
The third low-voltage load unit (6) of formula power supply, the third low-voltage load unit (6) with by least one storage capacitor (CH)
The energy-storage module (M) of composition is arranged in a one-to-one correspondence；
The energy-storage module (M) connect with the third low-voltage load unit (6), for being the third low-voltage load unit
(6) it is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507683.4A CN109687433B (en) | 2018-12-11 | 2018-12-11 | Flexible transformer substation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507683.4A CN109687433B (en) | 2018-12-11 | 2018-12-11 | Flexible transformer substation structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109687433A true CN109687433A (en) | 2019-04-26 |
| CN109687433B CN109687433B (en) | 2021-01-12 |
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