CN109995012A - Direct-flow distribution system and its control method - Google Patents
Direct-flow distribution system and its control method Download PDFInfo
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- CN109995012A CN109995012A CN201910190078.7A CN201910190078A CN109995012A CN 109995012 A CN109995012 A CN 109995012A CN 201910190078 A CN201910190078 A CN 201910190078A CN 109995012 A CN109995012 A CN 109995012A
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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
- H02J1/00—Circuit arrangements for dc mains or dc 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The present invention relates to DC distribution technical field, a kind of direct-flow distribution system and its control method are specifically provided, it is intended to solve the technical issues of how high reliability power supply simply and easily being carried out to DC load.For this purpose, first rectification module is connect with level-one DC bus and AC network respectively in direct-flow distribution system provided by the invention, second rectification module is connect with second level DC bus and with AC network respectively, and DC converting module is connect with level-one DC bus, second level DC bus and redundancy electric power supply system respectively.Based on above structure, the DC load of access level-one DC bus and second level DC bus is provided with two power supplies, electric energy conversion is carried out by controlling corresponding rectification module or DC converting module, single power supply power supply or dual power supply can be carried out to DC load, the convenience of direct current supply is not only increased, the power supply reliability of DC load is also greatly improved.
Description
Technical field
The present invention relates to DC distribution technical fields, and in particular to direct-flow distribution system and its control method.
Background technique
The supplying charge formula in power distribution network is mainly Alternating Current Power Supply at present, but since Alternating Current Power Supply has power supply reliably
Property it is low, electric energy inversion efficiency is low and system loss is larger the defects of, be unable to satisfy in power distribution network DC load to power supply electric energy matter
The high reliability request of amount is especially unable to satisfy the DC load more demanding to power supply reliability such as Internet data center
Power demands.For example, when the power quality problems such as three-phase imbalance, voltage dip and voltage swells occur for Alternating Current Power Supply,
Will extreme influence DC load power supply reliability.Meanwhile Alternating Current Power Supply needs to carry out alternating current multistage transformation of electrical energy
The direct current for meeting its voltage class and requiring can be exported to DC load, multistage transformation of electrical energy can be brought greatly in the process
Power consumption.
The power supply reliability of DC load can be currently provided by alternating current-direct current hybrid power supply, but alternating current-direct current mixing supplies
The topological structure and control method of electricity are often more complicated, while construction cost is also relatively high.
Correspondingly, this field needs a kind of new direct-flow distribution system to solve the above problems.
Summary of the invention
It is high in order to solve how simply and easily to carry out DC load in order to solve the above problem in the prior art
The technical issues of reliability is powered.For this purpose, the present invention provides direct-flow distribution system and its control methods.
In a first aspect, a kind of direct-flow distribution system provided by the invention mainly includes level-one DC bus, second level direct current
Bus, the first rectification module, the second rectification module, DC converting module and redundancy electric power supply system；
The direct current side ports of first rectification module are connect with the level-one DC bus, first rectification module
Exchange side ports are connect with AC network, and first rectification module is configured as the alternating current for exporting the AC network and turns
It is changed to direct current, will pass through the AC network to the level-one DC load power supply for accessing the level-one DC bus；
The direct current side ports of second rectification module are connect with the second level DC bus, second rectification module
Exchange side ports are connect with the AC network, and second rectification module is configured as the exchange for exporting the AC network
Electricity is converted to direct current, will pass through the AC network to the second level DC load power supply for accessing the second level DC bus；
The DC converting module respectively with the level-one DC bus, the second level DC bus and the redundant power supply
System connection, the DC converting module are configured as carrying out electric energy conversion to the direct current that the redundancy electric power supply system exports,
It is powered with will pass through the redundancy electric power supply system to the level-one DC load and/or the second level DC load.
Further, an optional technical solution provided by the invention is:
The AC network includes the first AC network and the second AC network, and first rectification module includes first whole
Flow device and the second rectifier；
The direct current side ports of first rectifier are connect with one end of the level-one DC bus, first rectifier
Exchange side ports connect with first AC network, first rectifier is configured as first AC network is defeated
Alternating current out is converted to direct current, is powered with will pass through first AC network to the level-one DC load；
The direct current side ports of second rectifier are connect with the other end of the level-one DC bus, second rectification
The exchange side ports of device are connect with second AC network, and second rectifier is configured as second AC network
The alternating current of output is converted to direct current, is powered with will pass through second AC network to the level-one DC load；
The exchange side ports of second rectification module are connect with first AC network, the second rectification module quilt
It is configured to the alternating current that first AC network exports being converted to direct current, will pass through first AC network to institute
State the power supply of second level DC load.
Further, an optional technical solution provided by the invention is:
It is provided with dc circuit breaker between the direct current side ports of first rectification module and the level-one DC bus, institute
It states and is provided with AC circuit breaker between the exchange side ports of the first rectification module and the AC network；
It is provided with dc circuit breaker between the direct current side ports of second rectification module and the second level DC bus, institute
It states and is provided with AC circuit breaker between the exchange side ports of the second rectification module and the AC network；
It is respectively arranged between the DC converting module and the level-one DC bus and the second level DC bus straight
Flow breaker.
Further, an optional technical solution provided by the invention is:
The redundancy electric power supply system includes generation of electricity by new energy unit and/or electrical energy storage unit.
Further, an optional technical solution provided by the invention is:
First rectification module is controllable rectifier module or uncontrollable rectification module, and second rectification module is controllable
Rectification module.
Further, an optional technical solution provided by the invention is:
It is provided with dc circuit breaker between the direct current side ports of first rectification module and the level-one DC bus, institute
It states and is provided with AC circuit breaker between the exchange side ports of the first rectification module and the AC network；
It is provided with dc circuit breaker between the direct current side ports of second rectification module and the second level DC bus, institute
It states and is provided with AC circuit breaker between the exchange side ports of the second rectification module and the AC network；
It is respectively arranged between the DC converting module and the level-one DC bus and the second level DC bus straight
Flow breaker.
In second aspect, a kind of direct-flow distribution system provided by the invention mainly includes level-one DC bus, second level direct current
Bus, the first rectification module, the second rectification module, DC converting module and redundancy electric power supply system, the first rectification module packet
The first rectifier and the second rectifier are included, the redundancy electric power supply system includes generation of electricity by new energy unit and/or electrical energy storage unit；
The direct current side ports of first rectifier are connect by dc circuit breaker with one end of the level-one DC bus,
The exchange side ports of first rectifier are connect by AC circuit breaker with the first AC network, and first rectifier is matched
It is set to and the alternating current of first AC network output is converted into direct current, will pass through first AC network to access
The level-one DC load of the level-one DC bus is powered；The direct current side ports of second rectifier by dc circuit breaker with
The other end of the level-one DC bus connects, and the exchange side ports of second rectifier are handed over by AC circuit breaker and second
The connection of galvanic electricity net, second rectifier are configured as the alternating current that second AC network exports being converted to direct current,
It is powered with will pass through second AC network to the level-one DC load；
The direct current side ports of second rectification module are connect by dc circuit breaker with the second level DC bus, described
The exchange side ports of second rectification module are connect by AC circuit breaker with first AC network, second rectification module
Be configured as by first AC network export alternating current be converted to direct current, with will pass through first AC network to
Access the second level DC load power supply of the second level DC bus；
Two direct current side ports in the DC converting module pass through dc circuit breaker respectively and the level-one direct current is female
Line is connected with second DC bus, a direct current side ports in the DC converting module and the redundancy electric power supply system
It being directly connected to, the DC converting module is configured as carrying out electric energy conversion to the direct current that the redundancy electric power supply system exports,
It is powered with will pass through the redundancy electric power supply system to the level-one DC load and/or the second level DC load.
In the third aspect, a kind of control method of direct-flow distribution system provided by the invention is specifically included that
According to the generated energy of the generation of electricity by new energy unit and the level-one DC load and the second level DC load
Loading demand, the respectively described level-one DC load and the second level DC load distribution can use new energy electricity；
Judge whether the available new energy electricity of targeted loads meets the loading demand of the targeted loads,
When it is described can meet the loading demand with new energy electricity when, control the generation of electricity by new energy unit pass through it is described
DC converting module is powered to the targeted loads；
When it is described can be unsatisfactory for the loading demand with new energy electricity when, continue to judge whether the AC network runs
It is normal: it is powered by the DC converting module to the targeted loads if so, controlling the generation of electricity by new energy unit, and
It controls the AC network and is powered by first rectification module or second rectification module to the targeted loads；If
It is no, then the generation of electricity by new energy unit and the electrical energy storage unit are controlled by the DC converting module simultaneously to the target
Load supplying；
Wherein, the targeted loads are the level-one DC load or the second level DC load.
And wherein, the direct-flow distribution system include level-one DC bus, second level DC bus, the first rectification module,
Second rectification module, DC converting module and redundancy electric power supply system, the redundancy electric power supply system include generation of electricity by new energy unit and
Electrical energy storage unit；The direct current side ports of first rectification module are connect with the level-one DC bus, the first rectification mould
The exchange side ports of block are connect with AC network, and first rectification module is configured as the exchange for exporting the AC network
Electricity is converted to direct current, will pass through the AC network to the level-one DC load power supply for accessing the level-one DC bus；
The direct current side ports of second rectification module are connect with the second level DC bus, the exchange side of second rectification module
Mouth is connect with the AC network, and second rectification module is configured as being converted in the alternating current that the AC network exports
Direct current, will pass through the AC network to the second level DC load power supply for accessing the second level DC bus；The direct current
Conversion module is connect with the level-one DC bus, the second level DC bus and the redundancy electric power supply system respectively, described straight
Stream conversion module is configured as carrying out electric energy conversion to the direct current that the redundancy electric power supply system exports, will pass through the redundancy
Power supply system is powered to the level-one DC load and/or the second level DC load.
Further, an optional technical solution provided by the invention is:
" according to the generated energy of the generation of electricity by new energy unit and the level-one DC load and the second level DC load
Loading demand, the respectively described level-one DC load and the second level DC load distribution can use new energy electricity " the step of
It specifically includes:
Judge whether the generated energy of the generation of electricity by new energy unit meets the loading demand of the second level DC load,
It, will be described when the generated energy of the generation of electricity by new energy unit is unsatisfactory for the loading demand of the second level DC load
Generated energy is all assigned as the available new energy electricity of the second level DC load；
When the generated energy of the generation of electricity by new energy unit meets the loading demand of the second level DC load, according to described
New energy electricity can be used to second level DC load distribution in loading demand accordingly,
And continue to judge whether the surplus generation of the generation of electricity by new energy unit meets the level-one DC load
Loading demand: if it is not, the surplus generation to be then all assigned as to the available new energy electricity of the level-one DC load；If
It is that then according to the surplus generation and the loading demand, to level-one DC load distribution, available new energy is electric accordingly
Amount, and the final surplus generation of the generation of electricity by new energy unit is stored to the electrical energy storage unit.
Further, an optional technical solution provided by the invention is:
" negative according to the generated energy of the generation of electricity by new energy unit and the level-one DC load and the second level direct current
The loading demand of load, the respectively described level-one DC load and the second level DC load distribution can use new energy electricity " step
Before rapid, the method also includes:
Whether the electricity price for judging the AC network of present period is low electricity price,
If the electricity price is low electricity price, the AC network is controlled to the level-one DC load and/or the second level
DC load power supply；
If the electricity price is not low electricity price, then follow the steps " according to the generated energy of the generation of electricity by new energy unit and institute
The loading demand of level-one DC load and the second level DC load is stated, the respectively described level-one DC load and the second level are straight
Current load distribution can use new energy electricity ".
Compared with the immediate prior art, above-mentioned technical proposal is at least had the following beneficial effects:
1, direct-flow distribution system provided by the invention mainly includes level-one DC bus, second level DC bus, the first rectification
Module, the second rectification module, DC converting module and redundancy electric power supply system.Specifically, the direct current side ports of the first rectification module
It is connect with level-one DC bus, the exchange side ports of the first rectification module are connect with AC network.The direct current of second rectification module
Side ports are connect with second level DC bus, and the exchange side ports of the second rectification module are connect with AC network.DC converting module
It is connect respectively with level-one DC bus, second level DC bus and redundancy electric power supply system.
In the present invention, the alternating current that AC network exports can be converted to level-one DC load institute by the first rectification module
The direct current needed powers to it, and the direct current that redundancy electric power supply system exports can be converted to level-one direct current by DC converting module
Direct current needed for load powers to it, to provide dual redundant power supply mechanism for level-one DC load, ensure that
Another power supply source still be can use when any one power supply source breaks down to level-one DC load normal power supply.Meanwhile at this
In invention, direct current needed for the alternating current that AC network exports can be converted to second level DC load by the second rectification module comes
It powers to it, DC converting module can also be converted to the direct current that redundancy electric power supply system exports needed for second level DC load
Direct current powers to it, to provide dual redundant power supply mechanism for second level DC load, ensure that in any one power supply
Another power supply source still be can use when source is broken down to second level DC load normal power supply.Optionally, provided by the invention
Direct-flow distribution system can also further increase level-one direct current to level-one is DC bus powered simultaneously by two AC networks
The power supply reliability of load and second level DC Complex.
Second level DC load can be the load more demanding to power supply reliability (in such as internet data in the present invention
The heart), level-one DC load, which can be, requires lower load (such as electric car and frequency converter) to power supply reliability.Compared to
The mode that AC energy is powered by multistage transformation of electrical energy to second level DC load, the present invention pass through to alternating current in the prior art
It can be carried out level-one transformation of electrical energy (to control the second rectification module for the alternating current of AC network and be converted directly into second level DC load
Required direct current) it powers to second level DC load, electric energy loss caused by transformation of electrical energy can be significantly reduced, and then improve
The operational efficiency of direct-flow distribution system.
2, in direct-flow distribution system provided by the invention the direct current side ports of first rectification module and level-one DC bus it
Between be provided with dc circuit breaker, be provided with AC circuit breaker between the exchange side ports and AC network of the first rectification module,
Dc circuit breaker, the exchange side of the second rectification module are provided between the direct current side ports and second level DC bus of two rectification modules
Be provided with AC circuit breaker between port and AC network, DC converting module and level-one DC bus and second level DC bus it
Between be respectively arranged with dc circuit breaker.Based on above structure, the present invention can be in the feelings of direct-flow distribution system generation different faults
The conducting and shutdown of each dc circuit breaker/AC circuit breaker of reasonable disposition under condition, to guarantee direct-flow distribution system to DC load
Normal power supply.
For example, can control the first rectification module when the first rectification module or the second rectification module break down and hand over
AC circuit breaker shutdown between AC circuit breaker or the second rectification module and AC network between galvanic electricity net, control are each
Dc circuit breaker normally.
When short trouble occurs for level-one DC bus, direct current side ports and the level-one that can control the first rectification module are straight
Flow the dc circuit breaker shutdown between the dc circuit breaker and DC converting module and level-one DC bus between bus, control
Make other dc circuit breaker normallies.
When short trouble occurs for second level DC bus, direct current side ports and the second level that can control the second rectification module are straight
Flow the dc circuit breaker shutdown between the dc circuit breaker and DC converting module and second level DC bus between bus, control
Make other dc circuit breaker normallies.
It, can be between the second rectification module and AC network when the second rectifier and DC converting module break down
AC circuit breaker shutdown, controls the dc circuit breaker between the direct current side ports and second level DC bus of the second rectification module, with
And the dc circuit breaker between DC converting module and level-one DC bus and second level DC bus is turned off, the first rectification of control
Dc circuit breaker normally between the direct current side ports and level-one DC bus of module.
3, first rectification module can be and can flexibly be adjusted according to control signal in direct-flow distribution system provided by the invention
The controllable rectifier module of whole output power, wherein control signal can be pulse width modulating signal (Pulse Width
Modulation, PWM) etc. any signal that can change 1 output power of the first rectification module.Meanwhile first rectification module also
The uncontrollable rectification module that can be output constant power, for example, the first rectification module can be diode, the anode of diode
It is connect with AC network, the cathode of diode is connect by dc circuit breaker with level-one DC bus.When the first rectification module is adopted
When with diode, the functional reliability of the first rectification module not only can be improved, the building of direct-flow distribution system can also be reduced
Cost is additionally controlled without to the first rectification module, reduces the control complexity of direct-flow distribution system.
4, redundancy electric power supply system mainly includes generation of electricity by new energy unit and/or electricity in direct-flow distribution system provided by the invention
Energy-storage units, are powered to the load by generation of electricity by new energy unit and electrical energy storage unit, and disappearing for generation of electricity by new energy not only can be improved
It receives ability, the power consumption of level-one DC load and second level DC load to AC network can also be reduced, to reduce straight
Flow the power economy cost of distribution system.
Detailed description of the invention
Fig. 1 is a kind of primary structure schematic diagram of direct-flow distribution system in the embodiment of the present invention；
Fig. 2 is the primary structure schematic diagram of another direct-flow distribution system in the embodiment of the present invention；
Fig. 3 is a kind of key step schematic diagram of the control method of direct-flow distribution system in the embodiment of the present invention.
Specific embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining technical principle of the invention, it is not intended that limit the scope of the invention.
Direct-flow distribution system provided by the invention is specifically described with reference to the accompanying drawing.
Refering to attached drawing 1, Fig. 1 illustrates the primary structure of direct-flow distribution system in the present embodiment.As shown in Figure 1,
Direct-flow distribution system mainly includes the first rectification module 1, the second rectification module 2, DC converting module 3, redundancy in the present embodiment
Power supply system 4, AC network 5, dc circuit breaker 61-64, level-one DC bus 7, second level DC bus 8, level-one DC load
71 and second level DC load 81.
Specifically, redundant power supply control system 4 mainly includes generation of electricity by new energy unit 41 and electrical energy storage unit 42.New energy
Generator unit 41 refers to the device to generate electricity based on unconventional energy resource such as solar energy, wind energy or geothermal energies, electrical energy storage unit
42 refer to store and exporting the device of electric energy, such as battery or lithium battery.
The direct current side ports of first rectification module 1 are connect by dc circuit breaker 61 with one end of level-one DC bus 7, the
The exchange side ports of one rectification module 1 are connect by AC circuit breaker (not shown) with AC network 5.Second rectification module 2
Direct current side ports are connect by dc circuit breaker 62 with one end of second level DC bus 8, the exchange side ports of the second rectification module 2
It is connect by AC circuit breaker (not shown) with AC network 5.DC converting module 3 is the multiterminal for including multiple direct current side ports
Mouthful DC converting module, a direct current side ports in the multiport DC converting module access level-one by dc circuit breaker 63
DC bus 7, direct current side ports access second level DC bus 8 by dc circuit breaker 64, a direct current side ports with it is superfluous
Remaining power supply system 4 connects.Optionally, the generation of electricity by new energy unit 41 in the present embodiment in redundancy electric power supply system 4 can be with direct current
The direct current side ports of conversion module 3 are directly connected to, and electrical energy storage unit can pass through the straight of dc circuit breaker and DC converting module 3
Flow side ports connection.Optionally, dc circuit breaker 61-64 is quick response breaker in the present embodiment, when DC distribution system
System can quickly disconnect when breaking down within the preset short period, guarantee the safety of system.
In the present embodiment, the first rectification module 1, which can be configured as, is converted to the alternating current that AC network 5 exports directly
Galvanic electricity is powered with will pass through AC network 5 to the level-one DC load 71 of access level-one DC bus 7, i.e., AC network 5 exports
Alternating current after the conversion of the first rectification module 1 output and then power to level-one DC load 71 on level-one DC bus 7.
Optionally, the first rectification module 1 can be and the controllable whole of output power can be adjusted flexibly according to control signal in the present embodiment
Flow module, wherein it is any that control signal can be pulse width modulating signal (Pulse Width Modulation, PWM) etc.
The signal of 1 output power of the first rectification module can be changed.Meanwhile first rectification module 1 can also be output constant power
Uncontrollable rectification module, for example, the first rectification module 1 can be diode, the anode of diode is connect with AC network 5, and two
The cathode of pole pipe is connect by dc circuit breaker 61 with level-one DC bus 7.
In the present embodiment, the second rectification module 2, which can be configured as, is converted to the alternating current that AC network 5 exports directly
Galvanic electricity is powered with will pass through AC network 5 to the second level DC load 8 of access second level DC bus 8, i.e., AC network 5 exports
Alternating current after the conversion of the second rectification module 2 output and then power to second level DC load 81 on second level DC bus 8.
The second rectification module 2 can be the controllable rectifier module that output power can be adjusted flexibly according to control signal in the present embodiment,
Wherein, control signal can be that pulse width modulating signal (Pulse Width Modulation, PWM) etc. is any to be changed
The signal of second rectification module, 2 output power.
In the present embodiment, DC converting module 3, which can be configured as, carries out the direct current that redundancy electric power supply system 4 exports
Electric energy conversion is powered, i.e. redundancy with will pass through redundancy electric power supply system 4 to level-one DC load 71 and/or second level DC load 81
The direct current that power supply system 4 exports can be converted to through DC converting module 3 to be met the voltage class of level-one DC load 71 and wants
It exports after the direct current asked to level-one DC bus 7, and then powers to level-one DC load 71, while redundancy electric power supply system 4 is defeated
Direct current out can also be converted to through DC converting module 3 meets the direct current that the voltage class of second level DC load 81 requires
After export to second level DC bus 8, and then to second level DC load 81 power.Optionally, DC converting module 3 in the present embodiment
It can be the controllable DC converting module that output power can be adjusted flexibly according to control signal, wherein control signal can be
Any can change such as pulse width modulating signal (Pulse Width Modulation, PWM) export in DC converting module 3
The signal of power.
AC network 5 and redundancy electric power supply system 4 can power to second level DC load 81 in the present embodiment, be that second level is straight
Current load 81 provides dual redundant power supply mechanism, and ensure that still can use another when any one power supply source breaks down
Power supply source is to 81 normal power supply of second level DC load.Meanwhile AC network 5 and redundancy electric power supply system 4 can also be straight to level-one
Current load 71 is powered, and also provides dual redundant power supply mechanism for level-one DC load 71, be ensure that and is sent out in any one power supply source
It still can use another power supply source to 71 normal power supply of level-one DC load when raw failure.Optionally, second level in the present embodiment
DC load 81 can be the load (such as Internet data center) more demanding to power supply reliability, and level-one DC load 71 can
To be to require lower load (such as electric car) to power supply reliability.
Further, in an alternate embodiment of the present invention where, direct-flow distribution system can also pass through two alternating currents
Net simultaneously to the DC bus powered power supply reliability to further increase level-one DC load and second level DC load of level-one, under
Face is specifically described the direct-flow distribution system in conjunction with attached drawing 2.
Refering to attached drawing 2 it is found that direct-flow distribution system mainly includes the first rectifier 11, the second rectifier in the present embodiment
12, the second rectification module 2, DC converting module 3, redundancy electric power supply system 4, the first AC network 51, the second AC network 52, straight
Flow breaker 61-65, level-one DC bus 7, second level DC bus 8, level-one DC load 71 and second level DC load 81.
Specifically, the direct current side ports of the first rectifier 11 pass through one end of dc circuit breaker 61 and level-one DC bus 71
The exchange side ports of connection, the first rectifier 11 are connect by AC circuit breaker (not shown) with the first AC network 51.Second
The direct current side ports of rectifier 12 are connect by dc circuit breaker 65 with the other end of level-one DC bus 71, the second rectifier 12
Exchange side ports connect with the second AC network 52 by AC circuit breaker (not shown).The exchange side of second rectification module 2
Port is connect by AC circuit breaker (not shown) with the first AC network 51, and the direct current side ports of the second rectification module 2 pass through
Dc circuit breaker 62 is connect with second level DC bus 8.DC converting module 3, redundant power supply system in direct-flow distribution system shown in Fig. 2
The structures such as system 4, dc circuit breaker 61-64, level-one DC load 71 and second level DC load 81, match with direct current shown in Fig. 1 respectively
DC converting module 3, redundancy electric power supply system 4, dc circuit breaker 61-64, level-one DC load 71 and second level direct current in electric system
It is all the same to load 81 isostructural functions, topology and connection relationship, succinct in order to describe, details are not described herein.
In the present embodiment, the first rectifier 11 can be configured as the alternating current conversion for exporting the first AC network 51
For direct current, powered with will pass through the first AC network 51 to the level-one DC load 71 of access level-one DC bus 7, i.e., first
The alternating current that AC network 51 exports exports after the conversion of the first rectifier 11 to level-one DC bus 7, and then straight to level-one
Current load 71 is powered.Optionally, the first rectifier 11 can be and output can be adjusted flexibly according to control signal in the present embodiment
The controlled rectifier of power, wherein control signal can be pulse width modulating signal (Pulse Width Modulation,
Any signal that can change 11 output power of the first rectifier such as PWM).Meanwhile first rectifier 11 can also be that output is solid
Determine power can not control rectifier, for example, the first rectifier 11 can be diode, the anode of diode and the first AC network
The cathode of 51 connections, diode is connect by dc circuit breaker 61 with level-one DC bus 7.
In the present embodiment, the second rectifier 12 can be configured as the alternating current conversion for exporting the second AC network 52
For direct current, powered with will pass through the second AC network 52 to the level-one DC load 71 of access level-one DC bus 7, i.e., second
The alternating current that AC network 52 exports exports after the conversion of the second rectifier 12 to level-one DC bus 7, and then straight to level-one
Current load 71 is powered.Optionally, the second rectifier 12 can be and output can be adjusted flexibly according to control signal in the present embodiment
The controlled rectifier of power, wherein control signal can be pulse width modulating signal (Pulse Width Modulation,
Any signal that can change 12 output power of the second rectifier such as PWM).Meanwhile second rectifier 12 can also be that output is solid
Determine power can not control rectifier, for example, the second rectifier 12 can be diode, the anode of diode and the first AC network
The cathode of 51 connections, diode is connect by dc circuit breaker 61 with level-one DC bus 7.
Below by taking direct-flow distribution system shown in FIG. 1 as an example, to the control method of direct-flow distribution system provided by the invention
It is specifically described.
Refering to attached drawing 3, Fig. 3 schematically illustrates the control method of direct-flow distribution system shown in Fig. 1 in the present embodiment
Key step.In the present embodiment, when the electricity price of AC network is when each period is fixed electricity price, extremely according to step S102
Method shown in step S107 carries out with electric control direct-flow distribution system.When the electricity price of AC network is time-varying electricity price (i.e. one
Partial period is low electricity price, and another part period is high electricity price) when, according to method shown in step S101 to step S108 to straight
Stream distribution system is carried out with electric control.
Control below by taking the electricity price of AC network is the direct-flow distribution system of time-varying electricity price as an example, to the direct-flow distribution system
Method processed is illustrated.Specifically, direct-flow distribution system can be carried out with electric control according to the following steps in the present embodiment:
Step S101: whether the electricity price for judging the AC network of present period is low electricity price.Specifically, if present period
The electricity price of AC network is low electricity price, then goes to step S105.If the electricity price of the AC network of present period is not low electricity price,
Go to step S102.
Step S102: according to the negative of the generated energy of generation of electricity by new energy unit and level-one DC load and second level DC load
The distribution of load demand, respectively level-one DC load and second level DC load can use new energy electricity.
Specifically, the available of level-one DC load and second level DC load can be distributed in the present embodiment according to the following steps
New energy electricity:
Step 1: judge whether the generated energy of generation of electricity by new energy unit 41 meets the loading demand of second level DC load 81: if
It is unsatisfactory for the loading demand of second level DC load 81, then goes to step 2.If meeting the loading demand of second level DC load 81,
Go to step 3.
Step 2: the generated energy of generation of electricity by new energy unit 41 is all assigned as to the available new energy of second level DC load 81
Electricity.
Step 3: straight to second level according to the generated energy of generation of electricity by new energy unit 41 and the loading demand of second level DC load 81
Current load 81 distributes available new energy electricity accordingly.Wherein, the available new energy electricity that second level DC load 81 is assigned to can
To be more than or equal to its loading demand.
Step 4: judging after can using new energy electricity to the distribution of second level DC load 81, the residue of generation of electricity by new energy unit 41
Whether generated energy meets the loading demand of level-one DC load 71: if being unsatisfactory for the loading demand of level-one DC load 71, turning
To step 5.If meeting the loading demand of level-one DC load 71, step 6 is gone to.
Step 5: the surplus generation of generation of electricity by new energy unit 41 is all assigned as the available new of level-one DC load 71
Energy electricity.
Step 6: according to the loading demand of the surplus generation of generation of electricity by new energy unit 41 and level-one DC load 71 to one
Grade DC load 71 distributes available new energy electricity accordingly.Wherein, the available new energy electricity that level-one DC load 71 is assigned to
Amount can be more than or equal to its loading demand.
Step 7: judging can be with after new energy electricity to level-one DC load 71 and the distribution of second level DC load 81, if also
There is unappropriated generated energy: if there are also unappropriated generated energy, final surplus generation being stored to electrical energy storage unit 42.
Step S103: judge whether the available new energy electricity of targeted loads meets the loading demand of targeted loads.Specifically
Ground goes to step S105 if the available new energy electricity of targeted loads meets its loading demand.If targeted loads is available new
Energy electricity is unsatisfactory for its loading demand, then goes to step S104.
Step S104: judge AC network whether normal operation.Specifically, if AC network normal operation, step is gone to
Rapid S106.If operation of power networks is abnormal, step S107 is gone to.
Step S105: control generation of electricity by new energy unit is powered to targeted loads.
Specifically, when targeted loads are level-one DC loads 71, DC converting module 3 is controlled by generation of electricity by new energy unit
After the direct current of 41 outputs is converted to the direct current for the voltage class requirement for meeting level-one DC load 71, by the direct current electricity output
It powers to level-one DC bus 7, and then to level-one DC load 71.When targeted loads are second level DC loads 81, control is straight
Stream conversion module 3, which is converted to the direct current that generation of electricity by new energy unit 41 exports, to be met the voltage class of second level DC load 81 and wants
After the direct current asked, power by the direct current electricity output to second level DC bus 8, and then to second level DC load 81.
Step S106: control generation of electricity by new energy unit and AC network are powered to targeted loads simultaneously.Optionally, this implementation
The first rectification module 1 or the second rectification can be controlled with the difference of new energy electricity and loading demand according to targeted loads in example
The output power of module 2.
Specifically, when targeted loads are level-one DC loads 71, DC converting module 3 is controlled by generation of electricity by new energy unit
After the direct current of 41 outputs is converted to the direct current for the voltage class requirement for meeting level-one DC load 71, by the direct current electricity output
It powers to level-one DC bus 7, and then to level-one DC load 71.Meanwhile it is defeated by AC network 5 to control the first rectification module 1
After alternating current out is converted to the direct current for the voltage class requirement for meeting level-one DC load 71, by the direct current electricity output to one
Grade DC bus 7, and then power to level-one DC load 71.
When targeted loads are second level DC loads 81, control DC converting module 3 exports generation of electricity by new energy unit 41
Direct current be converted to meet second level DC load 81 voltage class require direct current after, by the direct current electricity output to second level
DC bus 8, and then power to second level DC load 81.Meanwhile controlling the friendship that the second rectification module 2 exports AC network 5
After the direct current that the voltage class that galvanic electricity meets second level DC load 81 requires, by the direct current electricity output to second level DC bus 8,
And then it powers to second level DC load 81.
Step S107: control generation of electricity by new energy unit and electrical energy storage unit are powered to targeted loads simultaneously.
Specifically, when targeted loads are level-one DC loads 71, DC converting module 3 is controlled by generation of electricity by new energy unit
41 and electrical energy storage unit 42 export direct current be converted to meet level-one DC load 71 voltage class require direct current after,
It powers by the direct current electricity output to level-one DC bus 7, and then to level-one DC load 71.
When targeted loads are second level DC loads 81, DC converting module 3 is controlled by generation of electricity by new energy unit 41 and electricity
It is after the direct current that energy-storage units 42 export is converted to the direct current for the voltage class requirement for meeting second level DC load 81, this is straight
Galvanic electricity is exported to second level DC bus 8, and then is powered to second level DC load 81.
Step S108: control AC network is powered to level-one DC load and/or second level DC load.Specifically, it controls
The alternating current that AC network 5 exports is converted to the voltage class requirement for meeting level-one DC load 71 by the first rectification module 1
After direct current, power by the direct current electricity output to level-one DC bus 7, and then to level-one DC load 71.The second rectification of control
It is after the direct current that module 2 requires the voltage class that the alternating current that AC network 5 exports meets second level DC load 81, this is straight
Galvanic electricity is exported to second level DC bus 8, and then is powered to second level DC load 81.
Although each step is described in the way of above-mentioned precedence in above-described embodiment, this field
Technical staff is appreciated that the effect in order to realize the present embodiment, executes between different steps not necessarily in such order,
It (parallel) execution simultaneously or can be executed with reverse order, these simple variations all protection scope of the present invention it
It is interior.
It will be understood by those skilled in the art that above-mentioned direct-flow distribution system further includes some other known features, such as locate
Manage device, controller, memory etc., wherein memory includes but is not limited to random access memory, flash memory, read-only memory, may be programmed
Read-only memory, volatile memory, nonvolatile memory, serial storage, parallel storage or register etc., processor
Including but not limited to CPLD/FPGA, DSP, arm processor, MIPS processor etc., in order to unnecessarily obscure the implementation of the disclosure
Example, these well known structures are not as shown in figs. 1 and 2.
It will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments is wrapped
Certain features for including rather than other feature, but the combination of the feature of different embodiments mean in the scope of the present invention it
It is interior and form different embodiments.For example, in the following claims, embodiment claimed it is one of any
Can in any combination mode come using.
The present invention be also implemented as some or all equipment for executing method as described herein or
Program of device (for example, PC program and PC program product).It is such to realize that program of the invention can store in PC readable medium
On, or may be in the form of one or more signals.Such signal can be downloaded from an internet website to obtain, or
Person is provided on the carrier signal, or is provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.In the claims,
Word " comprising " does not exclude the presence of element or step not listed in the claims.Word " one " located in front of the element or " one
It is a " do not exclude the presence of multiple such elements.The use of word first and second does not indicate any sequence, can be by these word solutions
It is interpreted as title.
So far, it has been combined preferred embodiment shown in the drawings and describes technical solution of the present invention, still, this field
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these specific embodiments.Without departing from this
Under the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to the relevant technologies feature, these
Technical solution after change or replacement will fall within the scope of protection of the present invention.
Claims (10)
1. a kind of direct-flow distribution system, it is characterised in that including level-one DC bus, second level DC bus, the first rectification module,
Second rectification module, DC converting module and redundancy electric power supply system；
The direct current side ports of first rectification module are connect with the level-one DC bus, the exchange of first rectification module
Side ports are connect with AC network, and first rectification module is configured as being converted in the alternating current that the AC network exports
Direct current, will pass through the AC network to the level-one DC load power supply for accessing the level-one DC bus；
The direct current side ports of second rectification module are connect with the second level DC bus, the exchange of second rectification module
Side ports are connect with the AC network, and second rectification module is configured as the alternating current for exporting the AC network and turns
It is changed to direct current, will pass through the AC network to the second level DC load power supply for accessing the second level DC bus；
The DC converting module respectively with the level-one DC bus, the second level DC bus and the redundancy electric power supply system
Connection, the DC converting module are configured as carrying out electric energy conversion to the direct current that the redundancy electric power supply system exports, so as to
It is powered by the redundancy electric power supply system to the level-one DC load and/or the second level DC load.
2. direct-flow distribution system according to claim 1, which is characterized in that the AC network includes the first AC network
With the second AC network, first rectification module includes the first rectifier and the second rectifier；
The direct current side ports of first rectifier are connect with one end of the level-one DC bus, the friendship of first rectifier
Stream side ports are connect with first AC network, and first rectifier is configured as first AC network output
Alternating current is converted to direct current, is powered with will pass through first AC network to the level-one DC load；
The direct current side ports of second rectifier are connect with the other end of the level-one DC bus, second rectifier
Exchange side ports are connect with second AC network, and second rectifier is configured as exporting second AC network
Alternating current be converted to direct current, powered with will pass through second AC network to the level-one DC load；
The exchange side ports of second rectification module are connect with first AC network, and second rectification module is configured
Alternating current to export first AC network is converted to direct current, will pass through first AC network to described two
Grade DC load power supply.
3. direct-flow distribution system according to claim 1, which is characterized in that the direct current side ports of first rectification module
Dc circuit breaker is provided between the level-one DC bus, the exchange side ports of first rectification module are exchanged with described
AC circuit breaker is provided between power grid；
It is provided with dc circuit breaker between the direct current side ports of second rectification module and the second level DC bus, described
AC circuit breaker is provided between the exchange side ports and the AC network of two rectification modules；
It is disconnected that direct current is respectively arranged between the DC converting module and the level-one DC bus and the second level DC bus
Road device.
4. direct-flow distribution system according to claim 1, which is characterized in that the redundancy electric power supply system includes new energy hair
Electric unit and/or electrical energy storage unit.
5. direct-flow distribution system according to claim 1, which is characterized in that first rectification module is controlled rectification mould
Block or uncontrollable rectification module, second rectification module is controllable rectifier module.
6. direct-flow distribution system according to claim 2, which is characterized in that the direct current side ports of first rectification module
Dc circuit breaker is provided between the level-one DC bus, the exchange side ports of first rectification module are exchanged with described
AC circuit breaker is provided between power grid；
It is provided with dc circuit breaker between the direct current side ports of second rectification module and the second level DC bus, described
AC circuit breaker is provided between the exchange side ports and the AC network of two rectification modules；
It is disconnected that direct current is respectively arranged between the DC converting module and the level-one DC bus and the second level DC bus
Road device.
7. a kind of direct-flow distribution system, it is characterised in that including level-one DC bus, second level DC bus, the first rectification module,
Second rectification module, DC converting module and redundancy electric power supply system, first rectification module include the first rectifier and second
Rectifier, the redundancy electric power supply system include generation of electricity by new energy unit and/or electrical energy storage unit；
The direct current side ports of first rectifier are connect by dc circuit breaker with one end of the level-one DC bus, described
The exchange side ports of first rectifier are connect by AC circuit breaker with the first AC network, and first rectifier is configured as
The alternating current that first AC network exports is converted into direct current, will pass through first AC network to described in access
The level-one DC load of level-one DC bus is powered；The direct current side ports of second rectifier by dc circuit breaker with it is described
The other end of level-one DC bus connects, and the exchange side ports of second rectifier pass through AC circuit breaker and the second alternating current
Net connection, second rectifier are configured as the alternating current that second AC network exports being converted to direct current, so as to
It is powered by second AC network to the level-one DC load；
The direct current side ports of second rectification module are connect by dc circuit breaker with the second level DC bus, and described second
The exchange side ports of rectification module are connect by AC circuit breaker with first AC network, and second rectification module is matched
It is set to and the alternating current of first AC network output is converted into direct current, will pass through first AC network to access
The second level DC load of the second level DC bus is powered；
Two direct current side ports in the DC converting module pass through respectively dc circuit breaker and the level-one DC bus and
Second DC bus connects, and the direct current side ports and the redundancy electric power supply system in the DC converting module are direct
Connection, the DC converting module are configured as carrying out electric energy conversion to the direct current that the redundancy electric power supply system exports, so as to
It is powered by the redundancy electric power supply system to the level-one DC load and/or the second level DC load.
8. a kind of control method of direct-flow distribution system, which is characterized in that the direct-flow distribution system include level-one DC bus,
Second level DC bus, the first rectification module, the second rectification module, DC converting module and redundancy electric power supply system, the redundancy supply
Electric system includes generation of electricity by new energy unit and electrical energy storage unit；The direct current side ports and the level-one of first rectification module are straight
Bus connection is flowed, the exchange side ports of first rectification module are connect with AC network, and first rectification module is configured
Alternating current to export the AC network is converted to direct current, straight to the level-one is accessed will pass through the AC network
Flow the level-one DC load power supply of bus；The direct current side ports of second rectification module are connect with the second level DC bus,
The exchange side ports of second rectification module are connect with the AC network, and second rectification module is configured as will be described
The alternating current of AC network output is converted to direct current, will pass through the AC network to the access second level DC bus
The power supply of second level DC load；The DC converting module respectively with the level-one DC bus, the second level DC bus and institute
Redundancy electric power supply system connection is stated, the DC converting module is configured as carrying out the direct current that the redundancy electric power supply system exports
Electric energy conversion is powered with will pass through the redundancy electric power supply system to the level-one DC load and/or the second level DC load；
The control method includes:
According to the negative of the generated energy of the generation of electricity by new energy unit and the level-one DC load and the second level DC load
Load demand, the respectively described level-one DC load and second level DC load distribution can use new energy electricity；
Judge whether the available new energy electricity of targeted loads meets the loading demand of the targeted loads,
When it is described can meet the loading demand with new energy electricity when, control the generation of electricity by new energy unit by the direct current
Conversion module is powered to the targeted loads；
When it is described can be unsatisfactory for the loading demand with new energy electricity when, continue to judge whether the AC network runs just
It is normal: to be powered by the DC converting module to the targeted loads if so, controlling the generation of electricity by new energy unit, and control
It makes the AC network and is powered by first rectification module or second rectification module to the targeted loads；If it is not,
It is negative to the target simultaneously by the DC converting module then to control the generation of electricity by new energy unit and the electrical energy storage unit
Carry power supply；
Wherein, the targeted loads are the level-one DC load or the second level DC load.
9. the control method of direct-flow distribution system according to claim 8, which is characterized in that " sent out according to the new energy
The loading demand of the generated energy of electric unit and the level-one DC load and the second level DC load, the respectively described level-one
DC load and the second level DC load distribution can use new energy electricity " the step of specifically include:
Judge whether the generated energy of the generation of electricity by new energy unit meets the loading demand of the second level DC load,
When the generated energy of the generation of electricity by new energy unit is unsatisfactory for the loading demand of the second level DC load, by the power generation
Amount is all assigned as the available new energy electricity of the second level DC load；
When the generated energy of the generation of electricity by new energy unit meets the loading demand of the second level DC load, according to the load
New energy electricity can be used to second level DC load distribution in demand accordingly,
And continue to judge the load whether surplus generation of the generation of electricity by new energy unit meets the level-one DC load
Demand: if it is not, the surplus generation to be then all assigned as to the available new energy electricity of the level-one DC load；If so,
New energy electricity then can be used to level-one DC load distribution according to the surplus generation and the loading demand accordingly,
And the final surplus generation of the generation of electricity by new energy unit is stored to the electrical energy storage unit.
10. the control method of direct-flow distribution system according to claim 8, which is characterized in that " according to the new energy
The loading demand of the generated energy of generator unit and the level-one DC load and the second level DC load, respectively described one
Grade DC load and the second level DC load distribution can use new energy electricity " the step of before, the method also includes:
Whether the electricity price for judging the AC network of present period is low electricity price,
If the electricity price is low electricity price, the AC network is controlled to the level-one DC load and/or the second level direct current
Load supplying；
If the electricity price is not low electricity price, then follow the steps " according to the generated energy of the generation of electricity by new energy unit and described one
The loading demand of grade DC load and the second level DC load, the respectively described level-one DC load and the second level direct current are negative
New energy electricity can be used by carrying distribution ".
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