CN108155707A - A kind of DC bus powered system and its control method - Google Patents
A kind of DC bus powered system and its control method Download PDFInfo
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- CN108155707A CN108155707A CN201810101475.8A CN201810101475A CN108155707A CN 108155707 A CN108155707 A CN 108155707A CN 201810101475 A CN201810101475 A CN 201810101475A CN 108155707 A CN108155707 A CN 108155707A
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- 230000005611 electricity Effects 0.000 abstract description 18
- 239000013589 supplement Substances 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
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Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to a kind of DC bus powered system and its control method, which includes charger, dc bus, accumulator group and at least two bidirectional DC/DC modules；Accumulator group includes n group storage battery group sections, and each battery group section connects dc bus by bidirectional DC/DC module；When the voltage of dc bus is less than predeterminated voltage, it is DC bus powered that at least one set of accumulator group section of open fault does not occur by bidirectional DC/DC module, the DC port that wherein bidirectional DC/DC module is connect with dc bus is set as output state, and bidirectional DC/DC module is set as input state with the DC port that accumulator group section is connect.It is of the invention real-time, simple, stable, reliable, the reliability of DC operation power supply system can be effectively improved, reduces the probability of dc bus dead electricity.
Description
Technical field
The present invention relates to power domain, more specifically to a kind of DC bus powered system and its control method.
Background technology
The main function of DC operation power supply system is to be powered by dc bus for system equipment in electric system, works as friendship
When galvanic electricity net is normal, electric energy is provided into dc bus after being converted by AC network；When power down failure occurs for AC network, by
Accumulator group in DC operation power supply system provides electric energy for dc bus.System equipment on dc bus is important sets
It is standby, for ensureing electric system normal operation.Occur simultaneously in AC network Loss of power failure and accumulator group open fault, then
Corresponding dc bus certainty dead electricity, is stopped so as to cause the equipment on dc bus, influences the normal operation of electric system.
Relay protection device on dc bus is out of service, it is most likely that causes the catastrophic failure of whole transformer station.Therefore, how
It is to weigh one of whether reliable important indicator of DC operation power supply system to effectively prevent dc bus dead electricity.
At present in electric system one fill one electricity DC operation power supply system connection mode such as Fig. 1.One group of system configuration is filled
Motor, a group storage battery, one section of dc bus, a battery data logging device and a system monitor.Assuming that AC network dead electricity
Occur simultaneously with accumulator group open circuit, charger and accumulator group can not be normally DC bus powered, so as to cause direct current
System equipment power down on busbar.The relay protection device of substation is by DC bus powered, and relay protection device is once
Dead electricity needs 10 minutes or more that normal defencive function could be restored after the power is turned on again.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of dc bus and supplies
Electric system and its control method.
The technical solution adopted by the present invention to solve the technical problems is：A kind of DC bus powered system is constructed, including
It is connect with AC network for by the charger that AC conversion is direct current, the charger to connect and exports direct current to straight
Busbar is flowed, further includes accumulator group and at least two bidirectional DC/DC modules；
The accumulator group includes n group storage battery group sections, and wherein n is the integer more than 1；Each bidirectional DC/DC module
Include the DC port of two changeable states；The accumulator group section is corresponded with the bidirectional DC/DC module, every group of institute
It states accumulator group section and the dc bus is connected by the bidirectional DC/DC module；
When the voltage of the dc bus is less than predeterminated voltage, at least one set accumulator group of open fault does not occur
Section is described DC bus powered by the bidirectional DC/DC module, wherein the bidirectional DC/DC module connects with the dc bus
The DC port connect is set as output state, the DC port setting that the bidirectional DC/DC module is connect with the accumulator group section
For input state.
Preferably, DC bus powered system of the present invention, further includes system monitor and battery data logging device, described
System monitor connects the charger, battery data logging device, all bidirectional DC/DC modules and dc bus, the battery respectively
Logging connects the accumulator group；
The battery data logging device detects the terminal voltage of accumulator group section described in every group；The system monitor is used to connect in real time
It receives the detection data of the battery data logging device and monitors the voltage of the dc bus in real time.
Preferably, DC bus powered system of the present invention, the system monitor by RS485 communication modules or
CAN communication module connects the charger, all bidirectional DC/DC modules and battery data logging device.
Preferably, DC bus powered system of the present invention, the bidirectional DC/DC module include storage control strategy
The memory of program, the bidirectional DC/DC module perform the control strategy program automatically, wherein the control strategy program institute
The key parameter needed is issued to the bidirectional DC/DC module by the system monitor.
Preferably, DC bus powered system of the present invention, the accumulator group connects the charger, described to fill
Motor is the battery charging；
When the terminal voltage of accumulator group is the first float charge voltage Uf1, and the voltage of any accumulator group section is less than the
During two float charge voltage Uf2, the dc bus is filled by the corresponding bidirectional DC/DC module for the accumulator group section
Electricity, wherein the bidirectional DC/DC module is set as output state with the DC port that the dc bus is connect, it is described two-way
DCDC modules are set as input state with the DC port that the accumulator group section is connect.
Preferably, DC bus powered system of the present invention, the charger is by switching KaConnect the direct current
Busbar；
The accumulator group is by switching the Kb connections dc bus；
Each bidirectional DC/DC module passes through to the inductive switch Kn connections dc bus.
In addition, the present invention also provides a kind of control method of DC bus powered system, supplied applied to above-mentioned dc bus
Electric system, the method includes：
Whether the voltage for detecting dc bus is less than predeterminated voltage；
If so, at least one set of accumulator group section that open fault does not occur is described DC bus powered.
Preferably, the control method of DC bus powered system of the present invention, the accumulator group section are described straight
Stream bussed supply includes：
Bidirectional DC/DC module is set as output state, the bidirectional DC/DC mould with the DC port that the dc bus is connect
Block is set as input state with the DC port that the accumulator group section is connect, and the corresponding accumulator group section is the direct current
Bussed supply.
Preferably, the control method of DC bus powered system of the present invention, the voltage of the detection dc bus
Whether less than after predeterminated voltage, further include：
If the voltage of the dc bus is the first float charge voltage Uf1, the terminal voltage of all accumulator group sections is detected
Whether its second float charge voltage Uf2 is less than；
If detect the terminal voltage of the accumulator group section less than the second float charge voltage Uf2, the direct current mother
Line is that the accumulator group section charges by corresponding bidirectional DC/DC module, wherein the bidirectional DC/DC module with it is described straight
The DC port of stream busbar connection is set as input state, the direct current that the bidirectional DC/DC module is connect with the accumulator group section
Port is set as output state.
Preferably, the control method of DC bus powered system of the present invention, all accumulators of detection
Whether the terminal voltage of group section further includes less than after its second float charge voltage Uf2：
If the terminal voltage of the accumulator group section is the second float charge voltage Uf2, the corresponding bidirectional DC/DC mould
Two DC ports of block are in blocking.
Implement a kind of DC bus powered system and its control method of the present invention, have the advantages that：Including filling
Motor, dc bus, accumulator group and at least two bidirectional DC/DC modules；Accumulator group includes n group storage battery group sections, often
Group storage battery group section connects dc bus by bidirectional DC/DC module；When the voltage of dc bus is less than predeterminated voltage, do not occur
At least one set of accumulator group section of open fault by bidirectional DC/DC module to be DC bus powered, wherein bidirectional DC/DC module with
The DC port of dc bus connection is set as output state, and bidirectional DC/DC module is set with the DC port that accumulator group section is connect
It is set to input state.It is of the invention real-time, simple, stable, reliable, the reliability of DC operation power supply system can be effectively improved,
Reduce the probability of dc bus dead electricity.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the invention will be further described, in attached drawing：
Fig. 1 is the structure diagram of DC power-supply system in the prior art；
Fig. 2 is a kind of structure diagram of DC bus powered system of the present invention；
Fig. 3 is a kind of control method flow chart of DC bus powered system of the present invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
The specific embodiment of the present invention.
Fig. 2 is a kind of structure diagram of DC bus powered system of the present invention.
Specifically, the DC bus powered system includes charger, dc bus, accumulator group, at least two two-way
DCDC modules, system monitor and battery data logging device, wherein, charger is connect with AC network, for by AC conversion
For direct current, charger connects and exports direct current to dc bus.Accumulator group includes n group storage battery group sections, and wherein n is big
In 1 integer.Each bidirectional DC/DC module includes the DC port of two changeable states, and one of DC port connection is straight
Busbar, another DC port connection accumulator group section are flowed, each DC port can be switched to input state or defeated as needed
It does well.Accumulator group section is corresponded with bidirectional DC/DC module, and each battery group section is connected straight by bidirectional DC/DC module
Flow busbar.System monitor connects charger, battery data logging device, all bidirectional DC/DC modules and dc bus, battery respectively
Logging connects all accumulator group sections, and battery data logging device detects the terminal voltage of each battery group section.System monitor is used for
The detection data of real-time reception battery data logging device and the in real time voltage of monitoring dc bus.
When the voltage of dc bus is less than predeterminated voltage, do not occur open fault at least one set of accumulator group section pass through it is double
It is DC bus powered to DCDC modules, the DC port that wherein bidirectional DC/DC module is connect with dc bus is set as output shape
State, bidirectional DC/DC module are set as input state with the DC port that accumulator group section is connect.
With reference to figure 2, the function of the various pieces of the DC bus powered system is described in detail below.
Accumulator group：Accumulator group is connect by switching Kb with dc bus, and battery component is n accumulator group section,
Respectively B1, B2 ... Bn, wherein n are the integer more than 1.Each accumulator group section is sequentially connected in series, wherein each battery group section
Corresponding one group of bidirectional DC/DC module.
Charger：Charger is connect by switching Ka with dc bus.The effect of charger be when AC network is normal,
It is that direct current is DC bus powered and is accumulator group supplement electricity by AC conversion.Preferably, charger is generally by electric power
Operation power is formed with high-frequency switching power supply module；Charger needs to communicate with system monitor, and RS485 or CAN can be used.System
System monitor can adjust the output voltage of charger as needed.
Bidirectional DC/DC module：Two DC ports are set, and the input-output characteristic of two DC ports can be according to preset
Control strategy is converted automatically.Bidirectional DC/DC module is corresponded with accumulator group section, respectively M1, wherein M2 ... Mn, n
To be more than 1 integer.One DC port of bidirectional DC/DC module connects corresponding accumulator group section, another DC port
Pass through switch (being respectively K1, K2 ... Kn, wherein n are the integer more than 1) connection dc bus.Each bidirectional DC/DC module needs
It is communicated with system monitor, RS485 or CAN can be used.Particularly bidirectional DC/DC module can detect the voltage of two DC ports
Value is equivalent to the terminal voltage and d-c bus voltage value of detectable corresponding accumulator group section.
Battery data logging device：A battery data logging device is configured in accumulator group, for monitoring the working condition of accumulator group in real time,
The terminal voltage of each accumulator group section can be acquired in real time, and by the real-time uploading system monitor of corresponding monitoring data.
System monitor：System monitor monitor whole system working condition, and with charger, each bidirectional DC/DC mould
Block and battery data logging device communication, monitor the voltage of dc bus and the detection data of real-time reception battery data logging device in real time.System
Monitor pre-sets the key parameter needed for corresponding control strategy program, and is handed down to each bidirectional DC/DC module, each two-way
DCDC modules perform control strategy program automatically, and when meeting corresponding condition, bidirectional DC/DC module is automatically dc bus
Power supply or the automatically terminal voltage of balanced each accumulator group section.
In system normal operation, Ka is switched, Kb, K1, K2 ... Kn are closed state.AC network passes through charger
Electric energy is provided for dc bus, while is accumulator group electric energy supplement.Battery data logging device monitors the work shape of accumulator group in real time
State particularly can detect the terminal voltage of each accumulator group section, and in real time by testing result uploading system monitor.System monitor
The working condition of monitoring whole system in real time, particularly can in real time monitor on DC bus-bar voltage and real-time reception battery data logging device
The testing result of biography.
According to system configuration, the pre-set key parameter of system monitor includes：First float charge voltage of dc bus
Uf1, dc bus minimum voltage Usmin, the minimum terminal voltage Ubmin of accumulator group section, the second floating charging of accumulator group section
Press Uf2.The preset control strategy program of bidirectional DC/DC module is：When the voltage of dc bus is less than or equal to the direct current of setting
Busbar minimum voltage Usmin, and at least the terminal voltage of a group storage battery group section be higher than minimum terminal voltage Ubmin when, accordingly
Accumulator group section of the terminal voltage higher than minimum terminal voltage Ubmin will by corresponding bidirectional DC/DC module to be DC bus powered,
The voltage of dc bus is maintained to ensure the continuous power supply of dc bus not less than Usmin.
When DC bus-bar voltage is the first float charge voltage Uf1, if the terminal voltage for detecting the presence of accumulator group section is low
When the second float charge voltage Uf2, dc bus will be corresponding accumulator group section supplement electricity by corresponding bidirectional DC/DC module, from
And each accumulator group section terminal voltage is made to achieve the purpose that equilibrium.System monitor joins the key needed for above-mentioned control strategy program
Number is issued to each bidirectional DC/DC module.The key parameter that each bidirectional DC/DC module receives needed for above-mentioned control strategy later will be automatic
It performs, automatically switches the input/output state of two DC ports.The switching condition of corresponding two DC ports is：Work as direct current
When busbar voltage is the first float charge voltage Uf1, it is less than the second float charge voltage Uf2 if there is the terminal voltage of accumulator group section, then
The DC port being connect with dc bus will be set as input state by corresponding bidirectional DC/DC module automatically, will be stored with corresponding
The DC port of battery pack section connection is set as output state, and output voltage is the second float charge voltage Uf2.When the electricity of dc bus
Pressure is less than or equal to the dc bus minimum voltage Usmin set, and at least terminal voltage of a group storage battery group section is higher than minimum
During terminal voltage Ubmin, corresponding terminal voltage bidirectional DC/DC module corresponding higher than the accumulator group section of minimum terminal voltage Ubmin will
Can the DC port being connect with accumulator group section be set as input state automatically, the DC port being connect with dc bus is set
Output state is set to, output voltage is dc bus minimum voltage Usmin.
Accumulator group leader is operated under floating charge state the phase, and accumulator group terminal voltage is the first float charge voltage Uf1, corresponding to fill
Motor output voltage and DC bus-bar voltage are the first float charge voltage Uf1, and the terminal voltage of corresponding each accumulator group section is
Second float charge voltage Uf2.Two DC ports of each bidirectional DC/DC module are blocking, do not influence the normal fortune of system
Row.Assuming that ac grid voltage is normal, DC bus-bar voltage is the first float charge voltage Uf1, but due to accumulator group self-discharge
Etc. reasons lead to the terminal voltage of accumulator group section B1 less than the second float charge voltage Uf2, bidirectional DC/DC module M1 automatically will be at this time
The DC port of dc bus connection is set as input state, and the DC port being connect with accumulator group section B1 is set as exporting
State, output voltage are the second float charge voltage Uf2, are accumulator group automatically so as to which dc bus be made to pass through bidirectional DC/DC module M1
Section B1 electric energy supplements, ensure that the terminal voltage of B1 maintains the second float charge voltage Uf2, so as to reach each accumulator group section terminal voltage
Balanced purpose.
Assuming that AC network Loss of power failure occurs for system, and open fault occurs simultaneously for accumulator group, it is assumed that open fault
B1 sections are happened at, other accumulator group section terminal voltages are all higher than minimum terminal voltage Ubmin.Charger and accumulator group be not at this time
Can be normally DC bus powered, the voltage of dc bus will constantly decline, electric less than or equal to minimum dc bus when dropping to
When pressing Usmin, bidirectional DC/DC module M2, M3 ... Mn will be automatically by the direct currents with accumulator group section B2, B3 ... Bn connections
Port is set as input state, the DC port being connect with dc bus is set as output state, output voltage is female for direct current
Line minimum voltage Usmin, so as to which accumulator group section B2, B3 ... Bn be made to pass through corresponding bidirectional DC/DC module M2, M3 ... Mn
It is DC bus powered, ensures that DC bus-bar voltage not less than minimum DC bus-bar voltage Usmin, improves the power supply of dc bus
Continuity.
From above-mentioned control process as it can be seen that system monitor pre-sets the key parameter needed for control strategy program, and
Key parameter needed for control strategy program is handed down to each bidirectional DC/DC module, each bidirectional DC/DC module will perform control automatically
Strategy program, during system normal operation, the terminal voltage for maintaining each accumulator group section is balanced；There is AC network power down simultaneously in system
During with accumulator group open fault, the normal accumulator group section of terminal voltage will be direct current automatically by corresponding bidirectional DC/DC module
Bussed supply, ensure dc bus will not dead electricity, improve the power supply continuity of dc bus.
Beneficial effects of the present invention：One kind is provided and in real time, automatically improves DC bus powered successional controlling party
Method.Effectively reduce the DC bus powered interruption of DC operation power supply system and dead electricity risk.
It is illustrated below by way of specific embodiment.
With reference to figure 2, it is assumed that system is 220V straight-flow systems, and accumulator group is 108 sections, then the float charge voltage value of accumulator group
For 108*2.23V=241V, accumulator group is equally divided into 4 groups, i.e., each accumulator group section is 27 sections, and corresponding float charge voltage is
27*2.23V=60.21V minimum terminal voltage is 27*1.8V=48.6V；The minimum voltage of dc bus is 220*0.875=
192.5V.According to the control strategy pre-set, the state transition condition of each bidirectional DC/DC module DC port is as follows：When straight
When flowing busbar voltage for float charge voltage 241V, it is less than float charge voltage 60.21V if there is the terminal voltage of accumulator group section, relatively
The DC port being connect with dc bus will be set as input state by the bidirectional DC/DC module answered automatically, will be with accumulator group
The DC port of section connection is set as output state, and output voltage is float charge voltage 60.21V；When the voltage of dc bus is less than
Equal to the dc bus minimum voltage 192.5V of setting, and at least the terminal voltage of a group storage battery group section is higher than minimum terminal voltage
During 48.6V, accumulator group section corresponding bidirectional DC/DC module of the corresponding terminal voltage higher than minimum terminal voltage 48.6V will be automatic
The DC port being connect with accumulator group section is set as input state, the DC port being connect with dc bus is set as defeated
It does well, output voltage is dc bus minimum voltage 192.5V.
During system normal operation, Ka, Kb, K1 are switched, K2, K3, K4 is closed state, and system monitor is by charger
Output voltage setting is float charge voltage 241V, while provides electric energy for dc bus and accumulator group, and accumulator group is operated in floating
It fills under state, the terminal voltage of each accumulator group section is float charge voltage 60.21V, and two DC ports of bidirectional DC/DC module are located
In blocking.
When DC bus-bar voltage is float charge voltage 241V, it is assumed that accumulator group section B1 terminal voltages are less than float charge voltage at this time
The DC port being connect with dc bus will be set as input state by 60.21V, corresponding bidirectional DC/DC module M1 automatically, will
Output state is set as with the accumulator group section B1 DC ports connecting, and output voltage is float charge voltage 60.21V, dc bus
It is automatically accumulator group section B1 supplement electricity by bidirectional DC/DC module M1, it is equal reaches accumulator group section B1, B2, B3, B4 terminal voltage
Purpose for float charge voltage 60.21V.
Assuming that AC network Loss of power failure occurs for system, and open fault occurs simultaneously for accumulator group, it is assumed that open fault
B1 sections are happened at, other accumulator group section terminal voltages are all higher than minimum terminal voltage 48.6V.Charger and accumulator group be not at this time
Can be normally DC bus powered, the voltage of dc bus will constantly decline, electric less than or equal to minimum dc bus when dropping to
When pressing 192.5V, bidirectional DC/DC module M2, M3, M4 will will be set with the DC port of accumulator group section B2, B3, B4 connection automatically
Input state is set to, the DC port being connect with dc bus is set as output state, output voltage is minimum for dc bus
Voltage 192.5V, so as to which accumulator group section B2, B3, B4 be made to be supplied by corresponding bidirectional DC/DC module M2, M3, M4 for dc bus
Electricity ensures that DC bus-bar voltage not less than minimum DC bus-bar voltage 192.5V, improves the power supply continuity of dc bus.
It is a kind of control method flow chart of DC bus powered system of the present invention with reference to figure 3.
Specifically, the control method of the DC bus powered system is applied to above-mentioned DC bus powered system, method
Including：
S1, whether the voltage of dc bus is detected less than predeterminated voltage.
If less than predeterminated voltage at least one set of accumulator of open fault does not occur for S2, the voltage for detecting dc bus
Group section is DC bus powered.Further, accumulator group section for it is DC bus powered including：Bidirectional DC/DC module and dc bus
The DC port of connection is set as output state, and bidirectional DC/DC module is set as inputting with the DC port that accumulator group section is connect
State, corresponding accumulator group section are DC bus powered.
Further, it is further included in the voltage of step detection dc bus whether less than after predeterminated voltage：
If the voltage of S3, dc bus is the first float charge voltage Uf1, whether the terminal voltage for detecting all accumulator group sections is low
In its second float charge voltage Uf2.
If S4, detecting the terminal voltage of accumulator group section less than its second float charge voltage Uf2, dc bus by with
Corresponding bidirectional DC/DC module for accumulator group section charge, the DC port that wherein bidirectional DC/DC module is connect with dc bus
Input state is set as, bidirectional DC/DC module is set as output state with the DC port that accumulator group section is connect.
Further, it is also wrapped whether less than after its second float charge voltage Uf2 in the terminal voltage for detecting all accumulator group sections
It includes：
If the terminal voltage of S5, accumulator group section is its second float charge voltage Uf2, two of corresponding bidirectional DC/DC module
DC port is in blocking.
To sum up, the invention has the advantages that：
1. the risk of dc bus dead electricity is low, by the way that accumulator group is segmented, each accumulator group section is configured one group
Bidirectional DC/DC module and corresponding control circuit even if accumulator group is opened a way, will not cause dc bus Loss of power failure, effectively
Reduce the probability of dc bus dead electricity.
2. control mode is simple, reliable, required for system monitor rationally sets control strategy program according to system configuration
Key parameter, bidirectional DC/DC module receive control strategy program needed for key parameter and automatically execution control strategy program,
So as to achieve the purpose that improve DC bus powered continuity and balanced each accumulator group section terminal voltage.
3. realizing that simple, the period is short, upgrading can be transformed on the basis of existing DC operation power supply system.
Above example only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand present disclosure and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, the covering scope of the claims in the present invention should all be belonged to.
Claims (10)
1. a kind of DC bus powered system, including being connect with AC network for by charging that AC conversion is direct current
Machine, the charger connect and export direct current to dc bus, which is characterized in that further include accumulator group and at least two pairs
To DCDC modules；
The accumulator group includes n group storage battery group sections, and wherein n is the integer more than 1；Each bidirectional DC/DC module includes
The DC port of two changeable states；The accumulator group section is corresponded with the bidirectional DC/DC module, storage described in every group
Battery pack section connects the dc bus by the bidirectional DC/DC module；
When the voltage of the dc bus is less than predeterminated voltage, at least one set accumulator group section that open fault does not occur is led to
It is described DC bus powered to cross the bidirectional DC/DC module, wherein what the bidirectional DC/DC module was connect with the dc bus
DC port is set as output state, and the bidirectional DC/DC module is set as defeated with the DC port that the accumulator group section is connect
Enter state.
2. DC bus powered system according to claim 1, which is characterized in that further include system monitor and battery patrols
Instrument is examined, the system monitor connects the charger, battery data logging device, all bidirectional DC/DC modules and direct current respectively
Busbar, the battery data logging device connect the accumulator group；
The battery data logging device detects the terminal voltage of accumulator group section described in every group；The system monitor is used for real-time reception institute
It states the detection data of battery data logging device and monitors the voltage of the dc bus in real time.
3. DC bus powered system according to claim 2, which is characterized in that the system monitor passes through RS485
Communication module or CAN communication module connect the charger and all bidirectional DC/DC modules and battery data logging device.
4. DC bus powered system according to claim 1, which is characterized in that the bidirectional DC/DC module includes storage
The memory of control strategy program, the bidirectional DC/DC module perform the control strategy program automatically, wherein the control plan
Key parameter slightly needed for program is issued to the bidirectional DC/DC module by the system monitor.
5. DC bus powered system according to claim 1, which is characterized in that the accumulator group connects the charging
Machine, the charger are the battery charging；
When the terminal voltage of accumulator group is the first float charge voltage Uf1, and the voltage of any accumulator group section is floating less than second
During charging voltage Uf2, the dc bus is charged by the corresponding bidirectional DC/DC module for the accumulator group section,
Described in bidirectional DC/DC module be set as output state, the bidirectional DC/DC module with the DC port that the dc bus is connect
The DC port being connect with the accumulator group section is set as input state.
6. DC bus powered system according to claim 1, which is characterized in that the charger is by switching KaConnection
The dc bus；
The accumulator group is by switching KbConnect the dc bus；
Each bidirectional DC/DC module passes through to the inductive switch Kn connections dc bus.
7. a kind of control method of DC bus powered system, which is characterized in that applied to claim 1-6 any one of them
DC bus powered system, the method includes：
Whether the voltage for detecting dc bus is less than predeterminated voltage；
If so, at least one set of accumulator group section that open fault does not occur is described DC bus powered.
8. the control method of DC bus powered system according to claim 7, which is characterized in that the accumulator group section
For it is described it is DC bus powered including：
Bidirectional DC/DC module and the DC port that the dc bus is connect are set as output state, the bidirectional DC/DC module with
The DC port of the accumulator group section connection is set as input state, and the corresponding accumulator group section is the dc bus
Power supply.
9. the control method of DC bus powered system according to claim 7, which is characterized in that the detection direct current is female
Whether the voltage of line further includes less than after predeterminated voltage：
If the voltage of the dc bus is the first float charge voltage Uf1, whether the terminal voltage of all accumulator group sections of detection
Less than its second float charge voltage Uf2；
If detecting the terminal voltage of the accumulator group section less than the second float charge voltage Uf2, the dc bus leads to
It crosses corresponding bidirectional DC/DC module to charge for the accumulator group section, wherein the bidirectional DC/DC module is female with the direct current
The DC port of line connection is set as input state, the DC port that the bidirectional DC/DC module is connect with the accumulator group section
It is set as output state.
10. the control method of DC bus powered system according to claim 9, which is characterized in that the detection is all
Whether the terminal voltage of the accumulator group section further includes less than after its second float charge voltage Uf2：
If the terminal voltage of the accumulator group section is the second float charge voltage Uf2, the corresponding bidirectional DC/DC module
Two DC ports are in blocking.
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