CN109687433B - Flexible transformer substation structure - Google Patents
Flexible transformer substation structure Download PDFInfo
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- CN109687433B CN109687433B CN201811507683.4A CN201811507683A CN109687433B CN 109687433 B CN109687433 B CN 109687433B CN 201811507683 A CN201811507683 A CN 201811507683A CN 109687433 B CN109687433 B CN 109687433B
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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]
Abstract
The invention provides a flexible substation structure, comprising: the high-voltage rectifier unit is connected with the high-voltage side of the power distribution network at the input end, and connected with the high-voltage direct-current bus at the output end, so that high-voltage alternating current is converted into high-voltage direct current; the high-voltage direct current bus is formed by connecting a plurality of energy storage capacitors in series, and the energy storage capacitors store high-voltage direct current and supply power to the first low-voltage load unit; the first low-voltage load unit includes: the load control system comprises a first load unit connected with a local distributed power supply and at least one second load unit not connected with the local distributed power supply; the first load unit is arranged corresponding to the at least one energy storage capacitor, and the first load unit and the second load unit are connected with the same energy storage capacitor. The power supply for a plurality of direct-current voltage grade loads is realized, the energy storage for redundant generated energy of a local distributed power supply is realized, the energy waste is avoided, the voltage of the tail end of a feeder line of a power distribution network can be prevented from exceeding the limit, and the safety of a tail end user is guaranteed.
Description
Technical Field
The invention relates to the technical field of flexible power distribution, in particular to a flexible transformer substation structure.
Background
Along with the rapid development of loads, distributed energy and electric vehicles in a power distribution network, the traditional power distribution network structure and regulation and control mode face huge challenges, and the problems of feeder line power unbalance, heavy overload of a transformer, difficulty in increasing capacity of urban power transmission and distribution and the like are increasingly prominent.
Traditional power distribution networks usually adopt a radial structure, and although tie switches and section switches are added, most closed-loop designs operate in an open loop mode. The traditional transformer substation does not have active tide regulation capability and has defects when dealing with problems of distributed energy, electric vehicles and the like. Local distributed generation is connected to local distributed generation such as solar power generation on the low-voltage load side, and when the generated energy of the local distributed generation exceeds the load requirement of the local load, the redundant electric quantity generated by the local distributed generation cannot be consumed, so that the electricity abandoning phenomenon can occur, and the energy waste problem is caused. Meanwhile, the problem that the tail end voltage is out of limit is caused by the over-generation and random fluctuation of the local distributed power supply, so that the safety of a user at the tail end of the power distribution network is influenced.
Disclosure of Invention
The embodiment of the invention provides a flexible substation structure, which aims to solve the problems that a substation in the prior art cannot regulate and control a direct current load and a distributed power generation unit, the electricity abandoning phenomenon is easy to occur, energy is wasted, and the tail end voltage is easy to exceed the limit.
The embodiment of the invention provides a flexible substation structure, which comprises: the high-voltage power distribution system comprises a high-voltage rectifying unit, a high-voltage direct current bus and at least one first low-voltage load unit, wherein the input end of the high-voltage rectifying unit is connected with the high-voltage side of the power distribution network, the output end of the high-voltage rectifying unit is connected with the high-voltage direct current bus, and the high-voltage rectifying unit is used for converting high-voltage alternating current into high-; the high-voltage direct current bus is formed by connecting a plurality of energy storage capacitors in series, and the energy storage capacitors are used for storing the high-voltage direct current and supplying power to the first low-voltage load units correspondingly connected with the energy storage capacitors; the first low-voltage load unit includes: the load control system comprises a first load unit connected with a local distributed power supply and at least one second load unit which is not connected with the local distributed power supply and is arranged corresponding to the first load unit; the first load units are arranged in one-to-one correspondence with energy storage modules formed by at least one energy storage capacitor, and the first load units and the second load units are connected with the same energy storage module.
Optionally, the first load unit comprises: the energy storage device comprises a first isolation converter, a first inverter and a first load, wherein the input end of the first isolation converter is connected with the energy storage module and is used for converting the high-voltage direct current into low-voltage direct current; the input end of the first inverter is connected with the output end of the first isolation converter, and the output end of the first inverter is connected with the first load and used for converting the low-voltage direct current into low-voltage alternating current to supply power to the first load; and the output end of the local distributed power supply is connected with the first inverter and is used for supplying power to the first load.
Optionally, the second load unit comprises: the energy storage module is connected with the input end of the second isolation converter and used for converting the high-voltage direct current into low-voltage direct current; the input end of the second inverter is connected with the output end of the second isolation converter, and the output end of the second inverter is connected with the second load and used for converting the low-voltage direct current into low-voltage alternating current to supply power to the second load.
Optionally, when the power generation amount of the local distributed power supply exceeds a preset power consumption amount of the first load, the power generation amount of the local distributed power supply is transmitted to each energy storage capacitor in the energy storage module through the first inverter and the first isolation converter.
Optionally, the high voltage rectification unit is a modular multilevel converter.
Optionally, the modular multilevel converter is composed of a plurality of full-bridge sub-modules and/or a plurality of clamped dual sub-modules and/or a plurality of half-bridge sub-modules.
Optionally, the high voltage dc bus further comprises: and the voltage equalizing circuits are arranged in one-to-one correspondence with the energy storage capacitors and are connected in parallel with the energy storage capacitors and used for equalizing the voltage values of the energy storage capacitors.
Optionally, the voltage equalizing circuit includes: developments equalizer circuit, static equalizer circuit and voltage-sharing switch, wherein, developments equalizer circuit includes: the circuit comprises a first resistor and a first capacitor, wherein the first resistor is connected with the first capacitor in series; the static voltage-sharing circuit comprises: and the second resistor is connected with the dynamic voltage-sharing circuit in parallel, then connected with the voltage-sharing switch in series and then connected with the energy-storage capacitor in parallel.
Optionally, the flexible substation structure further comprises: the second low-voltage load unit is not connected with the local distributed power supply and is arranged in one-to-one correspondence with the energy storage module formed by at least one energy storage capacitor; the energy storage module is connected with the second low-voltage load unit and used for supplying power to the second low-voltage load unit.
Optionally, the flexible substation structure further comprises: at least one third low-voltage load unit connected with a local distributed power supply, wherein the third low-voltage load unit is arranged in one-to-one correspondence with the energy storage modules formed by at least one energy storage capacitor; the energy storage module is connected with the third low-voltage load unit and used for supplying power to the third low-voltage load unit.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides a flexible substation structure which comprises a high-voltage rectifying unit, a high-voltage direct-current bus and at least one first low-voltage load unit, wherein the first low-voltage load unit comprises a first load unit and at least one second load unit, the first load unit and each second load unit are connected to an energy storage module consisting of at least one energy storage capacitor on the high-voltage direct-current bus together, so that power supply for direct-current loads of multiple voltage levels is realized through the energy storage module, and the energy storage module also realizes energy storage for redundant generated energy of a local distributed power supply connected with the first load unit, so that energy waste is avoided, end voltage can be effectively prevented from exceeding the limit, and the safety of end users is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a flexible substation structure in an embodiment of the invention;
fig. 2 is another schematic diagram of a flexible substation structure in an embodiment of the invention;
fig. 3 is another schematic diagram of a flexible substation structure according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a flexible substation structure, as shown in fig. 1, the flexible substation structure includes: a high voltage rectifying unit 1, a high voltage direct current bus 2 and a first low voltage load unit 3, wherein,
the input end of the high-voltage rectification unit 1 is connected with the high-voltage side of the power distribution network, the output end of the high-voltage rectification unit 1 is connected with the high-voltage direct current bus 2, and the high-voltage rectification unit 1 is used for converting high-voltage alternating current into high-voltage direct current; the high-voltage direct current bus 2 is formed by connecting a plurality of energy storage capacitors CH in series, and the energy storage capacitors CH are used for storing high-voltage direct current and supplying power to first low-voltage load units 3 correspondingly connected with the energy storage capacitors CH; the first low-voltage load unit 3 includes: a first load unit 31 connected to the local distributed power source and a second load unit 32 provided corresponding to the first load unit 31 and not connected to the local distributed power source; the first load units 31 are arranged in one-to-one correspondence with the energy storage modules M formed by at least one energy storage capacitor CH, and the first load units 31 and the second load units 32 are connected with the same energy storage module M. It should be noted that, in the embodiment of the present invention, the number of the first low-voltage load units 3 and the second load units 32 is one, and in practical applications, the number of the first low-voltage load units 3 and the second load units 32 may be set to be 2 or more according to practical needs, and the present invention is not limited thereto. In addition, in the embodiment of the present invention, the number of the energy storage capacitors CH in the energy storage module M is 1, and in practical applications, the number of the energy storage capacitors CH may be set to be a plurality according to the requirement of the voltage class of the first low-voltage load unit 3, which is not limited in the present invention.
Through the cooperative cooperation of the components, the flexible substation structure provided by the embodiment of the invention realizes power supply for a plurality of voltage-class direct-current loads through the energy storage module M, and also realizes energy storage for redundant generated energy of a local distributed power supply connected with the first load unit, so that the waste of energy is avoided, the tail end voltage can be effectively prevented from exceeding the limit, and the safety of a tail end user is ensured.
In a preferred embodiment, as shown in fig. 2, the first load unit 31 includes: the system comprises a first isolation converter 311, a first inverter 312 and a first load 313, wherein the input end of the first isolation converter 311 is connected with an energy storage module M and is used for converting high-voltage direct current into low-voltage direct current; the input end of the first inverter 312 is connected to the output end of the first isolating converter 311, and the output end is connected to the first load 313, and is configured to convert the low-voltage dc power into low-voltage ac power to supply power to the first load 313; the output of the local distributed power supply is connected to a first inverter 312 for powering a first load 313.
In practical applications, as shown in fig. 2, the output end of the first isolation converter 311 is connected to a first isolation capacitor CM1, and is connected to the first inverter 312 through a first isolation capacitor CM1, and the first isolation capacitor CM1 performs a function of filtering the output dc voltage of the first isolation converter 311. Specifically, the first isolation converter 311 is an isolated direct current-direct current (DC-DC) converter, such as an isolated Buck-type DC converter, which includes: forward, push-pull, half-bridge and full-bridge inverters. The forward converter comprises a single-tube forward converter and a double-tube forward converter. Isolated Boost-type dc converters may also be used, including push-pull, half-bridge and full-bridge converters. An isolated Buck-boost direct current converter, namely a flyback converter, comprises a single-tube flyback converter and a double-tube flyback converter.
In practical applications, as shown in fig. 2, the first inverter 312 is a three-phase four-leg inverter 3, three-phase voltage output ends of the three-phase four-leg inverter are respectively connected to the first load 313 through a first inductor L1, the first inductor L1 is connected to the second isolation capacitor CM2 and then grounded, the local distributed power source is connected to the first load 313 through a second inductor L2, and the local distributed power source is connected to the first load 313, the second isolation capacitor CM2 and the first inverter 312 in common. The first inductor L1, the second isolation capacitor CM2, and the second inductor L2 described above perform a function of filtering the voltage of the first load 313.
In the embodiment of the present invention, the first isolation converter 311 is a bidirectional DC-DC converter, and the first inverter 312 is a bidirectional inverter, so that the electric energy generated by the local distributed power source is transmitted to the energy storage capacitor CH in the energy storage module M through the first inverter 312 and the first isolation converter 311, and the energy storage capacitor CH supplies power to other direct current loads, for example, the second load 323 in the second load unit 32, thereby avoiding the waste of energy.
In a preferred embodiment, as shown in fig. 2, the second load unit 32 includes: the system comprises a second isolation converter 321, a second inverter 322 and a second load 323, wherein the input end of the second isolation converter 321 is connected with an energy storage module M and is used for converting high-voltage direct current into low-voltage direct current; the input end of the second inverter 322 is connected to the output end of the second isolated converter 321, and the output end is connected to the second load 323, for converting the low-voltage dc power into low-voltage ac power to supply power to the second load.
In practical applications, as shown in fig. 2, the output end of the second isolation converter 321 is connected to a third isolation capacitor CM3, and is connected to the second inverter 322 through a third isolation capacitor CM3, and the third isolation capacitor CM3 performs a function of filtering the output dc voltage of the second isolation converter 321. Specifically, the second isolation converter 321 is an isolation type DC-DC converter, for example, an isolation type Buck type DC converter may be adopted, and the converter includes: forward, push-pull, half-bridge and full-bridge inverters. The forward converter comprises a single-tube forward converter and a double-tube forward converter. Isolated Boost-type dc converters may also be used, including push-pull, half-bridge and full-bridge converters. An isolated Buck-boost direct current converter, namely a flyback converter, comprises a single-tube flyback converter and a double-tube flyback converter.
In practical applications, as shown in fig. 2, the second inverter 322 is a three-phase four-leg inverter, the three-phase voltage output ends of the three-phase four-leg inverter are respectively connected to the second load 323 through the third inductor L3, the third inductor L3 is connected to the fourth isolation capacitor CM4 and then grounded, and the second load 323, the fourth isolation capacitor CM4 and the second inverter 322 are grounded. The third inductor L3 and the fourth isolation capacitor CM4 described above perform the function of filtering the voltage applied to the second load 323.
Specifically, in an embodiment, the high-voltage rectifying unit 1 is a modular multilevel converter. The modular multilevel converter has the function of blocking fault current, and can quickly block the fault current when a bus fault and other faults occur in a transformer substation, so that the safety of the transformer substation is ensured. The modular multilevel converter is composed of a plurality of full-bridge sub-modules and/or a plurality of clamping double sub-modules and/or a plurality of half-bridge sub-modules. In practical application, the modular multilevel converter can be composed of all-bridge sub-modules, clamping type double sub-modules and half-bridge sub-modules, and can be composed of all-bridge sub-modules, clamping type double sub-modules and half-bridge sub-modules according to requirements of actual conditions and in any proportion.
In a preferred embodiment, as shown in fig. 2, the high voltage dc bus 2 further includes: and the voltage equalizing circuits 4 are arranged in one-to-one correspondence with the energy storage capacitors CH, and the voltage equalizing circuits 4 are connected in parallel with the energy storage capacitors CH and are used for equalizing the voltage values of the energy storage capacitors CH. In practical application, under the influence of a local distributed power supply or a direct current load change, the energy storage capacitor CH may have a voltage imbalance phenomenon, and the voltage on the energy storage capacitor CH can be automatically balanced through the voltage-sharing circuit 4.
Specifically, in an embodiment, as shown in fig. 3, the voltage equalizing circuit 4 includes: developments equalizer circuit 41, static equalizer circuit 42 and voltage-sharing switch K, wherein, developments equalizer circuit 41 includes: the first resistor R1 and the first capacitor C1 are connected in series, and the first resistor R1 and the first capacitor C1 are connected in series; the static voltage equalizing circuit 42 includes: and the second resistor R2 and the second resistor R2 are connected in parallel with the dynamic voltage equalizing circuit 41, then are connected in series with the voltage equalizing switch K and then are connected in parallel with the energy storage capacitor CH. When the voltages of the energy storage capacitors CH on the high-voltage direct-current bus 2 are unbalanced, the voltage equalizing switch K is closed, and the automatic equalization of the energy storage capacitors CH can be realized through the static pressure equalizing circuit 42 and/or the dynamic equalizing circuit 41.
In a preferred embodiment, as shown in fig. 3, the flexible substation structure further includes: the second low-voltage load units 5 are not connected with the local distributed power supply, and the second low-voltage load units 5 are arranged in one-to-one correspondence with the energy storage modules M formed by at least one energy storage capacitor CH; the energy storage capacitor CH is connected to the second low-voltage load unit 5, and is configured to supply power to the second low-voltage load unit 5. In practical applications, the third low-voltage load unit 6 has the same structure as the second load unit 32, and the difference between the two is that the second load unit 32 and the first load unit 31 share the same energy storage module M, and the third low-voltage load unit 6 is separately connected to the corresponding energy storage module M. It should be noted that, in the embodiment of the present invention, the second low voltage load unit 5 is taken as an example for description, in practical applications, the number of the second low voltage load units 3 may be set to be 2 or more according to practical needs, and the present invention is not limited thereto. In addition, in the embodiment of the present invention, the number of the energy storage capacitors CH in the energy storage module M is 1, and in practical applications, the number of the energy storage capacitors CH may be set to be a plurality according to the requirement of the voltage class of the second low-voltage load unit 5, which is not limited in the present invention.
In a preferred embodiment, as shown in fig. 3, the flexible substation structure further includes: at least one third low-voltage load unit 6 connected with the local distributed power supply, wherein the third low-voltage load unit 6 is arranged in one-to-one correspondence with an energy storage module M formed by at least one energy storage capacitor CH; the energy storage module M is connected to the third low-voltage load unit 6, and is configured to supply power to the third low-voltage load unit 6. In practical applications, the fourth low-voltage load unit has the same structure as the first load unit 31, and the difference between the first load unit 31 and the at least one second load unit 32 is that the same energy storage capacitor CH is shared, and the fourth low-voltage load unit is separately connected to the corresponding energy storage capacitor CH. It should be noted that, in the embodiment of the present invention, the third low-voltage load unit 6 is taken as an example for description, in practical applications, the number of the third low-voltage load units 6 may be set to be 2 or more according to practical needs, and the present invention is not limited thereto. In addition, in the embodiment of the present invention, the number of the energy storage capacitors CH in the energy storage module M is 1, and in practical applications, the number of the energy storage capacitors CH may be multiple according to the requirement of the voltage class of the third low-voltage load unit 6, which is not limited in the present invention.
In practical application, the control mode of the flexible substation structure is as follows: the high-voltage side voltage source is controlled to stabilize the voltage of the high-voltage direct current bus 2; when the low-voltage side only contains a load, the isolated DC-DC converter and the rear-end inverter are controlled by one-way power flow to control and stably output alternating voltage; when the low-voltage side contains the local distributed power supply, the isolated DC-DC converter and the rear-end inverter are controlled by bidirectional power flow, and under the condition that the load voltage of the low-voltage side is guaranteed to reach the standard, redundant electric quantity generated by power generation of the local distributed power supply can flow to each energy storage capacitor CH of the high-voltage direct-current bus 2 through the DC-DC converter and the rear-end inverter.
Through the cooperative cooperation of the components, the flexible substation structure provided by the embodiment of the invention realizes power supply for a plurality of voltage-class direct-current loads through the energy storage module M, and also realizes energy storage for redundant generated energy of a local distributed power supply connected with the first load unit, so that not only is energy waste avoided, but also the tail end voltage can be effectively prevented from exceeding the limit, and the safety of a tail end user is ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A flexible substation structure, characterized in that it comprises: a high-voltage rectifying unit (1), a high-voltage direct-current bus (2) and at least one first low-voltage load unit (3), wherein,
the input end of the high-voltage rectifying unit (1) is connected with the high-voltage side of the power distribution network, the output end of the high-voltage rectifying unit is connected with the high-voltage direct current bus (2), and the high-voltage rectifying unit (1) is used for converting high-voltage alternating current into high-voltage direct current;
the high-voltage direct current bus (2) is formed by connecting a plurality of energy storage Capacitors (CH) in series, and the energy storage Capacitors (CH) are used for storing the high-voltage direct current and supplying power to the first low-voltage load units (3) correspondingly connected with the energy storage Capacitors (CH);
the first low-voltage load unit (3) includes: the load control system comprises a first load unit (31) connected with a local distributed power supply and at least one second load unit (32) which is arranged corresponding to the first load unit (31) and is not connected with the local distributed power supply;
the first load unit (31) and a first energy storage module formed by at least one energy storage Capacitor (CH) are arranged in a one-to-one correspondence mode, and the first load unit (31) and the second load unit (32) are connected with the same first energy storage module;
further comprising: at least one second low-voltage load unit (5) which is not connected with the local distributed power supply, wherein the second low-voltage load unit (5) is arranged in one-to-one correspondence with a second energy storage module formed by at least one energy storage Capacitor (CH);
the second energy storage module is connected with the second low-voltage load unit (5) and is used for supplying power to the second low-voltage load unit (5);
the energy storage capacitors can be set to different numbers according to the voltage level requirements required by the first low-voltage load unit (3) and the second low-voltage load unit (5) so as to supply power to a plurality of load units with different voltage level requirements;
the first energy storage module is further used for storing energy of redundant generated energy of the local distributed power supply connected with the first load unit.
2. Flexible substation structure according to claim 1, characterized in that the first load unit (31) comprises: a first isolated converter (311), a first inverter (312), a first load (313), wherein,
the input end of the first isolation converter (311) is connected with the first energy storage module and is used for converting the high-voltage direct current into low-voltage direct current;
the input end of the first inverter (312) is connected with the output end of the first isolation converter (311), the output end of the first inverter is connected with the first load (313), and the first inverter is used for converting the low-voltage direct current into low-voltage alternating current to supply power to the first load (313);
the output of the local distributed power supply is connected to the first inverter (312) for powering the first load (313).
3. Flexible substation structure according to claim 2, characterized in that the second load unit (32) comprises: a second isolated converter (321), a second inverter (322), a second load (323), wherein,
the input end of the second isolation converter (321) is connected with the first energy storage module and is used for converting the high-voltage direct current into low-voltage direct current;
the input end of the second inverter (322) is connected with the output end of the second isolation converter (321), and the output end of the second inverter is connected with the second load (323) and used for converting the low-voltage direct current into low-voltage alternating current to supply power to the second load (323).
4. Flexible substation structure according to claim 3,
when the power generation amount of the local distributed power supply exceeds a preset power consumption requirement of the first load (313), the power generation amount of the local distributed power supply is transmitted to each energy storage Capacitor (CH) in the first energy storage module through the first inverter (312) and the first isolation converter (311).
5. Flexible substation structure according to claim 1, characterized in that the high voltage rectification unit (1) is a modular multilevel converter.
6. Flexible substation structure according to claim 5, characterized in that the modular multilevel converter is composed of a plurality of full bridge sub-modules and/or a plurality of clamped double sub-modules and/or a plurality of half bridge sub-modules.
7. Flexible substation structure according to claim 1, characterized in that the high voltage direct current bus (2) further comprises: and the voltage equalizing circuits (4) are arranged in one-to-one correspondence with the energy storage Capacitors (CH), and the voltage equalizing circuits (4) are connected in parallel with the energy storage Capacitors (CH) and are used for equalizing the voltage values of the energy storage Capacitors (CH).
8. Flexible substation structure according to claim 7, characterized in that the voltage grading circuit (4) comprises: a dynamic voltage-sharing circuit (41), a static voltage-sharing circuit (42) and a voltage-sharing switch (K), wherein,
the dynamic voltage-sharing circuit (41) comprises: a first resistor (R1) and a first capacitor (C1), the first resistor (R1) and the first capacitor (C1) being connected in series;
the static voltage-sharing circuit (42) comprises: and the second resistor (R2) is connected with the dynamic voltage-sharing circuit (41) in parallel, then connected with the voltage-sharing switch (K) in series and then connected with the energy-storage Capacitor (CH) in parallel.
9. The flexible substation structure of claim 1, further comprising: at least one third low-voltage load unit (6) connected with a local distributed power supply, wherein the third low-voltage load unit (6) is arranged in one-to-one correspondence with a third energy storage module formed by at least one energy storage Capacitor (CH); and the third energy storage module is connected with the third low-voltage load unit (6) and is used for supplying power to the third low-voltage load unit (6).
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