CN112653202B - Power supply and distribution system based on flexible direct current power distribution network and control method thereof - Google Patents

Power supply and distribution system based on flexible direct current power distribution network and control method thereof Download PDF

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Publication number
CN112653202B
CN112653202B CN202011393311.0A CN202011393311A CN112653202B CN 112653202 B CN112653202 B CN 112653202B CN 202011393311 A CN202011393311 A CN 202011393311A CN 112653202 B CN112653202 B CN 112653202B
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power supply
circuit breaker
power
subsystem
direct
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CN112653202A (en
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毛文磊
文安
郭芳
周妙娴
杜金峰
赵攀
马俊杰
刚毅
吴铭
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Foshan University
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Foshan University
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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
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to the technical field of power supply and distribution, in particular to a power supply and distribution system based on a flexible direct-current power distribution network and a control method thereof, wherein the system comprises the following components: the system comprises a commercial power network subsystem, a wind power subsystem, a photovoltaic subsystem, an energy storage subsystem and a load, wherein the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load are connected with the commercial power network subsystem; the load is also connected with the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem respectively; the method comprises the following steps: when the power supply and distribution system supplies power, acquiring a power supply mode of the power supply and distribution system; judging whether the power supply mode is a mains network system power supply mode or an island power supply mode; if the power supply mode is a mains network system power supply mode, selecting to execute a mains network system power supply control strategy; if the power supply mode is the island power supply mode, the island power supply control strategy is selected to be executed.

Description

Power supply and distribution system based on flexible direct current power distribution network and control method thereof
Technical Field
The invention relates to the technical field of power supply and distribution, in particular to a power supply and distribution system based on a flexible direct-current power distribution network and a control method thereof.
Background
Aiming at the application scene of a large-scale data center, a power supply system with high reliability needs to be provided, and meanwhile, the power supply system is expected to be economical and high in quality. In a traditional data center power supply mode, an alternating current power supply and distribution network structure with multiple power supplies and multiple loops (2 or more than 2 power supplies and loops) is generally adopted, power supplies are all from a commercial power network, and the types of the power supplies are single. The alternating current distribution network is easily influenced by a commercial power network, the line transmission efficiency is low, voltage-stabilizing filtering equipment is needed, the capital investment is large, the operation economic benefit is poor, the traditional direct current distribution technology is adopted, the control flexibility is poor, and the harmonic quantity is large.
In the prior art, an alternating current distribution network has a complex structure, a variety of commercial power network access loads, complex signal transmission, poor voltage stability and more harmonic waves, and voltage-stabilizing filtering equipment is required for obtaining high-quality electric energy. In addition, the traditional system has a single power supply and needs to be subjected to multi-level AC/AC, AC/DC or DC/DC conversion, so that the number of conversion equipment is large, the efficiency is low, the cost investment is large, the system operation loss is high, the maintenance cost is also high, and meanwhile, the fault rate is relatively increased, thereby bringing about serious influence on the safety of the system. Secondly, in order to guarantee reliable power supply under the fault condition, an emergency backup power supply system is required to be equipped, equipment can occupy a certain land space, and the system cost is further increased.
Disclosure of Invention
The invention provides a power supply and distribution system based on a flexible direct current power distribution network and a control method thereof, which are used for solving one or more technical problems in the prior art and at least providing a beneficial selection or creation condition.
In order to achieve the purpose, the invention provides the following technical scheme:
a power supply and distribution system based on a flexible dc power distribution network, the system comprising: the system comprises a commercial power network subsystem, a wind power subsystem, a photovoltaic subsystem, an energy storage subsystem and a load;
the utility power grid subsystem comprises a first utility power grid system and a second utility power grid system, wherein the first utility power grid system comprises a first power supply, a first alternating current power supply breaker, a first alternating current transformer, a first alternating current circuit breaker, a first voltage source converter and a first direct current circuit breaker which are sequentially connected through a distribution line; the second commercial power grid system comprises a second standby power supply, a second alternating-current power supply breaker, a second alternating-current transformer, a second alternating-current circuit breaker, a second voltage source converter and a second direct-current circuit breaker which are sequentially connected through a distribution line;
the output end of the first alternating current power supply circuit breaker is connected with the output end of the second alternating current power supply circuit breaker through a seventh branch direct current circuit breaker, and the output end of the first alternating current transformer is connected with the output end of the second alternating current transformer through an eighth branch direct current circuit breaker;
the first direct current circuit breaker is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load; the second direct-current circuit breaker is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load;
and the load is also respectively connected with the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem.
Further, the photovoltaic subsystem comprises a second branch direct current converter and a second branch direct current breaker; one end of the second branch direct-current circuit breaker is connected with the second branch direct-current converter through a distribution line, and the other end of the second branch direct-current circuit breaker is respectively connected with the first direct-current circuit breaker and the second direct-current circuit breaker;
the energy storage subsystem comprises a third branch direct current breaker and a third branch direct current converter; one end of the third branch direct current breaker is connected with a third branch direct current converter through a distribution line; the other end of the third branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively;
the load comprises a charging pile subsystem and a data center subsystem, wherein the charging pile subsystem comprises a fourth branch direct current breaker and a fourth branch direct current converter; one end of the fourth branch direct current breaker is connected with the fourth branch direct current converter through a distribution line; the other end of the fourth branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively;
the data center subsystem comprises a fifth branch direct current breaker, a fifth branch direct current converter, a sixth branch direct current breaker and a sixth branch direct current converter; one end of the fifth branch direct-current circuit breaker is connected with the fifth branch direct-current converter through a distribution line, and the other end of the fifth branch direct-current circuit breaker is respectively connected with the first direct-current circuit breaker and the second direct-current circuit breaker; one end of the sixth branch direct-current circuit breaker is connected with the sixth branch direct-current converter through a distribution line, and the other end of the sixth branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively.
A power supply and distribution control method based on a flexible direct current power distribution network is applied to any one of the power supply and distribution systems based on the flexible direct current power distribution network, and the method comprises the following steps:
s100, acquiring a power supply mode of a power supply and distribution system when the power supply and distribution system supplies power;
step S200, judging whether the power supply mode is a mains network system power supply mode or an island power supply mode;
step S300, if the power supply mode is the mains network system power supply mode, selecting to execute a mains network system power supply control strategy;
and S400, if the power supply mode is an island power supply mode, selecting to execute an island power supply control strategy.
Further, the power supply control strategy of the commercial power network system comprises:
when a power supply control strategy of the mains supply network system is executed, judging whether the first mains supply network system normally operates;
controlling the first commercial power grid system to supply power under the normal operation state of the first commercial power grid system;
and if the first commercial power grid system fails, detecting a failure part, and adjusting a power supply path according to the failure part to avoid the failure part for supplying power.
Further, the adjusting the power supply path according to the fault location to avoid the fault location for supplying power includes:
if the fault part is detected to be positioned from the first power supply to the first alternating current power supply breaker, triggering the first alternating current power supply breaker to be disconnected, switching on the seventh branch direct current breaker, and controlling the second standby power supply to be connected to the first commercial power grid system for supplying power;
if the fault part is detected to be positioned between the first alternating current power supply circuit breaker and the first alternating current circuit breaker, triggering the first alternating current power supply circuit breaker to be disconnected, triggering the seventh branch direct current circuit breaker to be connected, and controlling the first power supply to be connected to the second commercial power grid system for supplying power;
if the fault position is detected to be between the first alternating current power supply circuit breaker and the first alternating current circuit breaker, triggering the first alternating current power supply circuit breaker to be disconnected, and controlling a second commercial power grid system to supply power;
and if the fault part is detected to be positioned from the first alternating current circuit breaker to the first direct current circuit breaker, triggering the first alternating current circuit breaker to be disconnected, switching on the eighth branch direct current circuit breaker, and controlling the first power supply to be connected to the second commercial power grid system for supplying power.
Further, the power supply control strategy of the commercial power network system further comprises:
and if the first commercial power grid system fails, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power to the load until the power supply path is adjusted.
Further, the island power supply control strategy comprises:
detecting whether the total electric energy of the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem meets the load requirement, if so, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the load, and if not, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the data center subsystem.
A power supply and distribution control system based on a flexible dc power distribution network, the system comprising:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement any one of the power supply and distribution control methods based on the flexible direct current power distribution network.
The invention has the beneficial effects that: the invention discloses a power supply and distribution system based on a flexible direct-current power distribution network and a control method thereof, which overcome the defects of multiple power supply modes and conversion links, low efficiency and high failure rate of the traditional single power grid, and by combining the wind power subsystem, the photovoltaic subsystem and the flexible direct-current power distribution network technology, the provided power supply and distribution system has various line selections and reliable signal transmission, can reduce the number of intermediate transmission and conversion equipment, has small transmission loss during system operation, saves the equipment floor space area and saves the economic cost for construction, operation and maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a topology structure diagram of a power supply and distribution system based on a flexible direct current distribution network in an embodiment of the invention;
fig. 2 is a schematic flow chart of a power supply and distribution control method based on a flexible direct current power distribution network in an embodiment of the present invention.
Detailed Description
The conception, specific structure and technical effects of the present application will be described clearly and completely with reference to the following embodiments and the accompanying drawings, so that the purpose, scheme and effects of the present application can be fully understood. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1, as shown in fig. 1, a power supply and distribution system based on a flexible dc power distribution network according to an embodiment of the present application includes: the system comprises a commercial power network subsystem, a wind power subsystem, a photovoltaic subsystem, an energy storage subsystem and a load;
the utility power grid subsystem comprises a first utility power grid system and a second utility power grid system, wherein the first utility power grid system comprises a first power supply G1, a first alternating current power supply circuit breaker CB11, a first alternating current transformer T1, a first alternating current circuit breaker CB12, a first voltage source converter VSC1 and a first direct current circuit breaker CB13 which are sequentially connected through a distribution line; the second commercial power grid system comprises a second standby power supply G2, a second alternating current power supply circuit breaker CB21, a second alternating current transformer T2, a second alternating current circuit breaker CB22, a second voltage source converter VSC2 and a second direct current circuit breaker CB23 which are sequentially connected through a distribution line;
the output end of the first alternating current power supply circuit breaker CB11 is connected with the output end of the second alternating current power supply circuit breaker CB21 through a seventh branch direct current circuit breaker CB7, and the output end of the first alternating current transformer T1 is connected with the output end of the second alternating current transformer T2 through an eighth branch direct current circuit breaker CB 8;
the first direct current circuit breaker CB13 is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load; the second direct-current circuit breaker CB23 is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load;
and the load is also respectively connected with the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem.
In the embodiment provided by the invention, compared with the traditional Direct current Transmission technology, Direct current Transmission based on a Voltage Source Converter has no problems of reactive compensation and commutation failure, active power and reactive power can be controlled quickly and independently, the operation is flexible, the expansibility is good, the Direct current Transmission system is called as a flexible Direct current Transmission system (VSC-HVDC), the flexible Direct current Transmission system has excellent expansibility, outputs High-quality Voltage, and is widely applied to engineering.
In the embodiment provided by the invention, the adopted new energy power grid systems such as the wind power subsystem and the photovoltaic subsystem are flexibly controlled, the energy utilization efficiency is high, light and wind energy are inexhaustible, the new energy power grid system is connected into the power supply system, the dependence on a mains supply power grid system is reduced, meanwhile, under the utilization of natural energy such as wind and light, the power energy cost is saved, and the economy is better in long-term operation. The technical application of combining the new energy power grid based on the flexible direct current power distribution network and the wind, light and other systems is a main mode for improving the economy and reliability of the power supply and distribution network system.
The power supply and distribution system in the embodiment comprises at least one wind power subsystem, at least one photovoltaic subsystem and at least one energy storage subsystem, wherein the energy storage subsystem comprises at least one energy storage station; in this embodiment, the power supply supplies power to the load through the Voltage Source Converter (VSC), and because the VSC does not have commutation failure and reactive compensation problems, the power can be independently adjusted and the controllability is good, and the harmonic level is low, further improving the security and stability of the power supply and distribution system. The power supply and distribution system provided by the embodiment has the advantages of various line selection, reliable signal transmission, capability of reducing the number of intermediate transmission and transformation equipment, low transmission loss in system operation, and great saving of the occupied space area of the equipment and the economic cost of construction, operation and maintenance.
In an improved embodiment, the wind power subsystem comprises a first branch direct current breaker CB1 and a first branch direct current converter; one end of the first branch direct current breaker CB1 is connected with a first branch direct current converter through a distribution line; the other end of the first branch direct current circuit breaker CB1 is connected with a first direct current circuit breaker CB13 and a second direct current circuit breaker CB23 respectively;
the photovoltaic subsystem comprises a second branch direct current converter and a second branch direct current breaker CB 2; one end of the second branch direct current circuit breaker is connected with a second branch direct current converter through a distribution line, and the other end of the second branch direct current circuit breaker CB2 is respectively connected with a first direct current circuit breaker CB13 and a second direct current circuit breaker CB 23;
the energy storage subsystem comprises a third branch direct current breaker CB3 and a third branch direct current converter; one end of the third branch direct current breaker CB3 is connected with a third branch direct current converter through a distribution line; the other end of the third branch circuit DC breaker CB3 is respectively connected with a first DC circuit breaker CB13 and a second DC circuit breaker CB 23;
the load comprises a charging pile subsystem and a data center subsystem, wherein the charging pile subsystem comprises a fourth branch direct current breaker CB4 and a fourth branch direct current converter; one end of the fourth branch direct current breaker CB4 is connected with the fourth branch direct current converter through a distribution line; the other end of the fourth branch circuit DC breaker CB4 is respectively connected with a first DC circuit breaker CB13 and a second DC circuit breaker CB 23;
the data center subsystem comprises a fifth branch direct current breaker CB5, a fifth branch direct current converter, a sixth branch direct current breaker CB6 and a sixth branch direct current converter; one end of the fifth branch direct current circuit breaker CB5 is connected with a fifth branch direct current converter through a distribution line, and the other end of the fifth branch direct current circuit breaker CB5 is respectively connected with the first direct current circuit breaker CB13 and the second direct current circuit breaker CB 23; one end of the sixth branch direct current circuit breaker CB6 is connected with a sixth branch direct current converter through a distribution line, and the other end of the sixth branch direct current circuit breaker CB6 is connected with the first direct current circuit breaker CB13 and the second direct current circuit breaker CB23 respectively.
Referring to fig. 2, as shown in fig. 2, a power supply and distribution control method based on a flexible dc power distribution network according to an embodiment of the present application is applied to a power supply and distribution system based on a flexible dc power distribution network according to any of the embodiments described above, and the method includes the following steps:
s100, acquiring a power supply mode of a power supply and distribution system when the power supply and distribution system supplies power;
step S200, judging whether the power supply mode is a mains network system power supply mode or an island power supply mode;
step S300, if the power supply mode is the mains network system power supply mode, selecting to execute a mains network system power supply control strategy;
and S400, if the power supply mode is an island power supply mode, selecting to execute an island power supply control strategy.
As shown in fig. 2, in an improved embodiment, the utility grid system power supply control strategy includes:
when a power supply control strategy of the mains supply network system is executed, judging whether the first mains supply network system normally operates;
controlling the first commercial power grid system to supply power under the normal operation state of the first commercial power grid system;
and if the first commercial power grid system fails, detecting a failure part, and adjusting a power supply path according to the failure part to avoid the failure part for supplying power.
In an improved embodiment, the adjusting the power supply path according to the fault location to supply power avoiding the fault location includes:
if the fault position is detected to be located between a first power supply G1 and a first alternating current power supply circuit breaker CB11, triggering the first alternating current power supply circuit breaker CB11 to be disconnected, switching on a seventh branch direct current circuit breaker CB7, and controlling a second standby power supply G2 to be connected to a first commercial power grid system for supplying power;
that is, the power supply is changed from the first power supply G1 to the second backup power supply G2, and power is supplied sequentially through the second backup power supply G2, the second ac power supply breaker CB21, the seventh branch dc breaker CB7, the first ac transformer T1, the first ac line breaker CB12, the first voltage source converter VSC1, and the first dc line breaker CB 13;
if the fault position is detected to be between a first alternating current power supply circuit breaker CB11 and a first alternating current circuit breaker CB12, triggering the first alternating current power supply circuit breaker CB11 to be disconnected, and controlling a second commercial power grid system to supply power;
that is, power is supplied sequentially through the second backup power supply G2, the second ac power supply circuit breaker CB21, the second ac transformer T2, the second ac line circuit breaker CB22, the second voltage source converter VSC2, and the second dc line circuit breaker CB 23;
and if the fault position is detected to be located between the first alternating current circuit breaker CB12 and the first direct current circuit breaker CB13, the first alternating current circuit breaker CB12 is triggered to be disconnected, the eighth branch direct current circuit breaker CB8 is switched on, and the first power supply G1 is controlled to be connected to the second commercial power grid system for supplying power.
That is, power is supplied sequentially through the first power supply G1, the first ac power supply circuit breaker CB11, the first ac transformer T1, the eighth branch dc circuit breaker CB8, the second ac line circuit breaker CB22, the second voltage source converter VSC2, and the second dc line circuit breaker CB 23.
In an improved embodiment, the utility grid system power supply control strategy further includes:
and if the first commercial power grid system fails, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power to the load until the power supply path is adjusted.
In this embodiment, if the first utility power grid system fails, short-time emergency power supply is performed through the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem, and the energy storage subsystem can suppress the fluctuation influence on the system caused by the failure or line switching of the first utility power grid system, so that the first utility power grid system can meet the power supply requirement after recovering to normal; meanwhile, the influence caused by load fluctuation of the charging pile subsystem is also inhibited, and the electric energy can be continuously consumed.
In an improved embodiment, the islanding power supply control strategy comprises:
detecting whether the total electric energy of the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem meets the load requirement, if so, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the load, and if not, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the data center subsystem.
In the embodiment, when the municipal power network subsystem has emergency situations such as two-pole failure, the utility model enters an island mode, triggers the first voltage source converter VSC1 and/or the second voltage source converter VSC2 to be immediately locked, triggers the first direct current circuit breaker CB13 to be connected with the second direct current circuit breaker CB23, and controls the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power to a load when detecting that the total electric energy of the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem meets the load requirement; otherwise, only the data center subsystem is powered.
When only the data center subsystem is powered, the energy storage subsystem is also a main node for balancing the voltage of the data center subsystem, power control and energy management are coordinated, core equipment of the data center subsystem is powered, safe and reliable operation of the data center subsystem is guaranteed, and an emergency power supply system device is not required to be equipped. The natural energy can be fully utilized, and the operating electricity expense is saved.
For the application scene of the large-scale data center subsystem, compared with the traditional method, the flexible direct-current power distribution network structure is adopted, the transmission efficiency of the flexible direct-current power distribution network is high, the flexible direct-current power distribution network can be well connected with other load equipment in a grid mode, the problems that the voltage frequency fluctuation of the traditional alternating-current power distribution network is large, harmonic waves are multiple and the like are avoided, emergency power supplies and voltage-stabilizing filter equipment can be reduced, the line loss is reduced, the safety and the reliability of the large-scale data center subsystem are improved, and the defects that the technical equipment of the traditional alternating-current power distribution network is multiple in conversion links, low in efficiency and greatly influenced by a mains supply power grid are overcome; meanwhile, a method for supplying power to the data center subsystem together with a structure combining the wind power subsystem and the photovoltaic subsystem is adopted, so that a large amount of electricity expense is saved, diversified power supply modes are provided, and the reliability of the system is improved; the energy storage subsystem coordinates power control and energy management to ensure emergency power supply of the data center subsystem; in addition, the energy storage subsystem can also be used as an emergency backup power supply; when the voltage or frequency of the utility grid system fluctuates, the energy storage subsystem immediately responds according to the adjusting instruction, coordinates the wind power subsystem and the photovoltaic subsystem to stably output the voltage and the power, reduces the impact on the utility grid system, and ensures the utility grid system to continuously, safely and reliably operate. Fill electric pile subsystem and can in time consume the electric energy, reduce and abandon light and abandon wind, obtain extra economic benefits, reduce environmental pollution, improve the economic nature of system.
While the description of the present application has been made in considerable detail and with particular reference to a few illustrated embodiments, it is not intended to be limited to any such details or embodiments or any particular embodiments, but it is to be construed that the present application effectively covers the intended scope of the application by reference to the appended claims, which are interpreted in view of the broad potential of the prior art. Further, the foregoing describes the present application in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial changes from the present application, not presently foreseen, may nonetheless represent equivalents thereto.

Claims (3)

1. A power supply and distribution control method based on a flexible direct current power distribution network is applied to a power supply and distribution system based on the flexible direct current power distribution network, and is characterized in that the power supply and distribution system based on the flexible direct current power distribution network comprises the following steps: the system comprises a commercial power network subsystem, a wind power subsystem, a photovoltaic subsystem, an energy storage subsystem and a load;
the utility power grid subsystem comprises a first utility power grid system and a second utility power grid system, wherein the first utility power grid system comprises a first power supply, a first alternating current power supply breaker, a first alternating current transformer, a first alternating current circuit breaker, a first voltage source converter and a first direct current circuit breaker which are sequentially connected through a distribution line; the second commercial power grid system comprises a second standby power supply, a second alternating-current power supply breaker, a second alternating-current transformer, a second alternating-current circuit breaker, a second voltage source converter and a second direct-current circuit breaker which are sequentially connected through a distribution line;
the output end of the first alternating current power supply circuit breaker is connected with the output end of the second alternating current power supply circuit breaker through a seventh branch direct current circuit breaker, and the output end of the first alternating current transformer is connected with the output end of the second alternating current transformer through an eighth branch direct current circuit breaker;
the first direct current circuit breaker is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load; the second direct-current circuit breaker is respectively connected with the wind power subsystem, the photovoltaic subsystem, the energy storage subsystem and the load;
the load is also connected with the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem respectively;
the wind power subsystem comprises a first branch direct current breaker and a first branch direct current converter which are sequentially connected through a distribution line; the other end of the first branch direct-current circuit breaker is connected with a first direct-current circuit breaker and a second direct-current circuit breaker respectively;
the photovoltaic subsystem comprises a second branch direct current converter and a second branch direct current breaker; one end of the second branch direct-current circuit breaker is connected with the second branch direct-current converter through a distribution line, and the other end of the second branch direct-current circuit breaker is respectively connected with the first direct-current circuit breaker and the second direct-current circuit breaker;
the energy storage subsystem comprises a third branch direct current breaker and a third branch direct current converter; one end of the third branch direct current breaker is connected with a third branch direct current converter through a distribution line; the other end of the third branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively;
the load comprises a charging pile subsystem and a data center subsystem, wherein the charging pile subsystem comprises a fourth branch direct current breaker and a fourth branch direct current converter; one end of the fourth branch direct current breaker is connected with the fourth branch direct current converter through a distribution line; the other end of the fourth branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively;
the data center subsystem comprises a fifth branch direct current breaker, a fifth branch direct current converter, a sixth branch direct current breaker and a sixth branch direct current converter; one end of the fifth branch direct-current circuit breaker is connected with the fifth branch direct-current converter through a distribution line, and the other end of the fifth branch direct-current circuit breaker is respectively connected with the first direct-current circuit breaker and the second direct-current circuit breaker; one end of the sixth branch direct-current circuit breaker is connected with the sixth branch direct-current converter through a distribution line, and the other end of the sixth branch direct-current circuit breaker is connected with the first direct-current circuit breaker and the second direct-current circuit breaker respectively;
the method comprises the following steps:
s100, acquiring a power supply mode of a power supply and distribution system when the power supply and distribution system supplies power;
step S200, judging whether the power supply mode is a mains network system power supply mode or an island power supply mode;
step S300, if the power supply mode is the mains network system power supply mode, selecting to execute a mains network system power supply control strategy;
step S400, if the power supply mode is an island power supply mode, selecting to execute an island power supply control strategy;
wherein, the power supply control strategy of the commercial power network system comprises:
when a power supply control strategy of the mains supply network system is executed, judging whether the first mains supply network system normally operates;
controlling the first commercial power grid system to supply power under the normal operation state of the first commercial power grid system;
if the first commercial power grid system fails, detecting a failure part, and adjusting a power supply path according to the failure part to avoid the failure part for supplying power;
wherein, the regulation power supply route according to trouble position to avoid the trouble position supplies power, includes:
if the fault part is detected to be positioned from the first power supply to the first alternating current power supply breaker, triggering the first alternating current power supply breaker to be disconnected, switching on the seventh branch direct current breaker, and controlling the second standby power supply to be connected to the first commercial power grid system for supplying power;
if the fault part is detected to be positioned between the first alternating current power supply circuit breaker and the first alternating current circuit breaker, triggering the first alternating current power supply circuit breaker to be disconnected, triggering the seventh branch direct current circuit breaker to be connected, and controlling the first power supply to be connected to the second commercial power grid system for supplying power;
if the fault position is detected to be between the first alternating current power supply circuit breaker and the first alternating current circuit breaker, triggering the first alternating current power supply circuit breaker to be disconnected, and controlling a second commercial power grid system to supply power;
and if the fault part is detected to be positioned from the first alternating current circuit breaker to the first direct current circuit breaker, triggering the first alternating current circuit breaker to be disconnected, switching on the eighth branch direct current circuit breaker, and controlling the first power supply to be connected to the second commercial power grid system for supplying power.
2. The power supply and distribution control method based on the flexible direct current power distribution network according to claim 1, wherein the power supply control strategy of the utility grid system further comprises:
and if the first commercial power grid system fails, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power to the load until the power supply path is adjusted.
3. The power supply and distribution control method based on the flexible direct current power distribution network according to claim 1, wherein the island power supply control strategy comprises:
detecting whether the total electric energy of the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem meets the load requirement, if so, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the load, and if not, controlling the wind power subsystem, the photovoltaic subsystem and the energy storage subsystem to supply power for the data center subsystem.
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