CN112216849A - DC/DC converter current control system and method for hydrogen fuel cell system - Google Patents
DC/DC converter current control system and method for hydrogen fuel cell system Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04225—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during start-up
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04302—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during start-up
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04895—Current
- H01M8/04917—Current of auxiliary devices, e.g. batteries, capacitors
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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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
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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Abstract
A DC/DC converter current control system for a hydrogen fuel cell system includes a DC/DC converter and a DC-DC converter controller, the DC/DC converter includes two DC/DC conversion units connected in parallel, each DC/DC conversion unit includes an input current control circuit and a DC conversion circuit. The method comprises the steps that charging request information sent by an energy storage battery is responded, starting information and a first input current control signal are sent to a hydrogen fuel cell stack and a DC/DC conversion unit respectively, two input current control circuits respond to the first input current control signal, the sum of current values of input currents of direct current conversion circuits of the two DC/DC conversion units input to the hydrogen fuel cell stack is controlled to be a first preset current value, and the first preset current value is smaller than the input current value of a DC/DC converter at rated power. Because the low-power output of the DC/DC converter is set at the initial starting stage of the hydrogen fuel cell stack, the probability that the hydrogen fuel cell stack can damage the energy storage cell due to unstable operation at the initial starting stage is reduced.
Description
Technical Field
The invention relates to the technical field of hydrogen fuel cells, in particular to a DC/DC converter current control system and method for a hydrogen fuel cell system.
Background
With the development of new energy technology and the development trend of low-carbon economy, the exploration of new energy is already developed globally. The hydrogen is used as a high-quality fuel, has rich resources and large fuel heat, and is a clean energy source which can be continuously developed besides fossil fuel. The government of China has invested a great deal of scientific research funding support for the hydrogen energy industry all the time. In recent years, as the new energy automobile industry is developed more and more, the fuel cell technology as one of the realization approaches is more and more emphasized, thereby driving the overall development of the hydrogen energy industry chain. In a hydrogen fuel cell system, a DC/DC converter is used as an important component of a hydrogen fuel vehicle, and has a function of converting high-voltage direct current into low-voltage direct current. Because the DC/DC converter is ensured to keep a good working state, the performance of the fuel cell automobile is better guaranteed, and the long-term stable operation of the energy storage battery of the fuel cell automobile is guaranteed, the research on the current control method of the DC/DC converter is a popular subject in the technical field of the hydrogen fuel cell at the present stage.
Disclosure of Invention
The invention mainly solves the technical problem of how to ensure the long-term stable work of the energy storage battery by controlling the input current of the DC/DC converter.
According to a first aspect, an embodiment provides a DC/DC converter current control system for a hydrogen fuel cell system, including a DC/DC converter and a DC-DC converter controller; the DC/DC converter comprises two DC/DC conversion units connected in parallel;
each DC/DC conversion unit comprises an input current control circuit and a direct current conversion circuit; the direct current conversion circuit is connected between a hydrogen fuel cell stack of the hydrogen fuel cell system and an energy storage cell and is used for reducing the direct current output by the hydrogen fuel cell stack and then charging the energy storage cell; the input current control circuit is used for controlling the current value of the input current of the hydrogen fuel cell stack to the direct current conversion circuit;
the direct current converter controller is used for connecting the hydrogen fuel cell stack and a BMS circuit of the energy storage battery, and is used for sending starting information to the hydrogen fuel cell stack and sending a first input current control signal to an input current control circuit of each DC/DC conversion unit respectively when receiving charging request information sent by the BMS circuit;
the input current control circuits of the two DC/DC conversion units respond to the first input current control signal and control the sum of current values of input currents of the hydrogen fuel cell stack and the direct current conversion circuits of the two DC/DC conversion units to be a first preset current value; when the DC/DC converter works at rated power, the first preset current value is smaller than the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
In one embodiment, the DC-DC converter controller is further configured to send a second input current control signal to the input current control circuit of each DC/DC conversion unit after the hydrogen fuel cell stack is started for a first preset time;
the input current control circuits of the two DC/DC conversion units respond to the second input current control signal and control the sum of current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units, which are input into the hydrogen fuel cell stack, to be a second preset current value; and when the DC/DC converter works at rated power, the second preset current value is equal to the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
In an embodiment, the DC conversion circuits of the two DC/DC conversion units adjust the respective input currents in an interleaving complementary manner, so as to ensure that the sum of the current values of the input currents of the DC conversion circuits of the two DC/DC conversion units input to the hydrogen fuel cell stack is the first preset current value or the second preset current value.
In one embodiment, the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, including:
when the input current of the direct current conversion circuit of one DC/DC conversion unit is reduced, the input current of the direct current conversion circuit of the other DC/DC conversion unit is increased;
the DC/DC converter also comprises a CAN communication circuit; the CAN communication circuit is respectively connected with the input current control circuits of the two DC/DC conversion units, and the input current control circuits of the two DC/DC conversion units are used for mutually acquiring the value of the input current of the hydrogen fuel cell stack input into the respective DC conversion circuits.
In one embodiment, the DC conversion circuits of the two DC/DC conversion units adjust respective input currents in an interleaved complementary manner, further comprising:
each DC/DC conversion unit further comprises a temperature monitoring module, and the temperature monitoring module is used for monitoring the working temperature of the DC conversion circuit;
the CAN communication circuit is respectively connected with the temperature monitoring modules of the two DC/DC conversion units and is also used for the input current control circuits of the two DC/DC conversion units to mutually acquire the working temperature of the DC conversion circuit;
when the working temperature of the direct current conversion circuit of one DC/DC conversion unit is higher than that of the direct current conversion circuit of the other DC/DC conversion unit, the input current control circuit of the DC/DC conversion unit controls the current value of the input current to decrease by a first preset adjusting value, and the input current control circuit of the other DC/DC conversion unit controls the current value of the input current to increase by the first preset adjusting value.
In one embodiment, the DC conversion circuits of the two DC/DC conversion units adjust respective input currents in an interleaved complementary manner, further comprising:
and when the working temperature of the direct current conversion circuit of each DC/DC conversion unit is greater than a first preset temperature threshold value, controlling the sum of the current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units input into the hydrogen fuel cell stack to be a first preset current value.
According to a second aspect, an embodiment provides a DC/DC converter current control method for a hydrogen fuel cell system, including:
the hydrogen fuel cell system DC/DC converter includes two DC/DC conversion units connected in parallel, each of the DC/DC conversion units including an input current control circuit and a direct current conversion circuit; the direct current conversion circuit is connected between a hydrogen fuel cell stack of the hydrogen fuel cell system and an energy storage cell and is used for reducing the direct current output by the hydrogen fuel cell stack and then charging the energy storage cell; the input current control circuit is used for controlling the current value of the input current of the hydrogen fuel cell stack to the direct current conversion circuit;
responding to charging request information sent by an energy storage battery of the hydrogen fuel cell system, sending starting information to the hydrogen fuel cell stack, and respectively sending a first input current control signal to an input current control circuit of each DC/DC conversion unit;
the input current control circuits of the two DC/DC conversion units respond to the first input current control signal and control the sum of current values of input currents of the hydrogen fuel cell stack and the direct current conversion circuits of the two DC/DC conversion units to be a first preset current value; when the DC/DC converter works at rated power, the first preset current value is smaller than the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
In one embodiment, the method further comprises:
after the hydrogen fuel cell stack is started for a first preset time, respectively sending a second input current control signal to the input current control circuit of each DC/DC conversion unit;
the input current control circuits of the two DC/DC conversion units respond to the second input current control signal and control the sum of current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units, which are input into the hydrogen fuel cell stack, to be a second preset current value; and when the DC/DC converter works at rated power, the second preset current value is equal to the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
In an embodiment, the DC conversion circuits of the two DC/DC conversion units adjust the respective input currents in an interleaving complementary manner, so as to ensure that the sum of the current values of the input currents of the DC conversion circuits of the two DC/DC conversion units input to the hydrogen fuel cell stack is the first preset current value or the second preset current value.
In one embodiment, the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, including:
when the input current of the direct current conversion circuit of one DC/DC conversion unit is reduced, the input current of the direct current conversion circuit of the other DC/DC conversion unit is increased;
the DC/DC converter also comprises a CAN communication circuit; the CAN communication circuit is respectively connected with the input current control circuits of the two DC/DC conversion units, and the input current control circuits of the two DC/DC conversion units are used for mutually acquiring the value of the input current of the hydrogen fuel cell stack input into the respective DC conversion circuits.
A DC/DC converter current control system for a hydrogen fuel cell system according to the above embodiment includes a DC/DC converter and a DC-DC converter controller, the DC/DC converter including two DC/DC converting units connected in parallel, each DC/DC converting unit including an input current control circuit and a DC converting circuit. The method comprises the steps that charging request information sent by an energy storage battery is responded, starting information and a first input current control signal are sent to a hydrogen fuel cell stack and a DC/DC conversion unit respectively, two input current control circuits respond to the first input current control signal, the sum of current values of input currents of direct current conversion circuits of the two DC/DC conversion units input to the hydrogen fuel cell stack is controlled to be a first preset current value, and the first preset current value is smaller than the input current value of a DC/DC converter at rated power. Because the low-power output of the DC/DC converter is set at the initial starting stage of the hydrogen fuel cell stack, the probability that the hydrogen fuel cell stack can damage the energy storage cell due to unstable operation at the initial starting stage is reduced.
Drawings
FIG. 1 is a schematic diagram of an exemplary DC/DC converter current control system;
fig. 2 is a flow chart illustrating a method for controlling the current of the DC/DC converter in another embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In an embodiment of the present invention, a DC/DC converter current control system includes a DC/DC converter and a DC/DC converter controller, the DC/DC converter includes two DC/DC conversion units connected in parallel, and each DC/DC conversion unit includes an input current control circuit and a DC conversion circuit. And responding to charging request information sent by the energy storage battery, and respectively sending starting information and a first input current control signal to the hydrogen fuel cell stack and the DC/DC conversion unit, wherein the two input current control circuits respond to the first input current control signal and control the sum of current values of input currents of the hydrogen fuel cell stack and the DC conversion circuits of the two DC/DC conversion units to be a first preset current value, and the first preset current value is smaller than the input current value of the DC/DC converter at rated power. Because the low-power output of the DC/DC converter is set at the initial starting stage of the hydrogen fuel cell stack, the probability that the hydrogen fuel cell stack can damage the energy storage cell due to unstable operation at the initial starting stage is reduced.
The first embodiment is as follows:
referring to fig. 1, a schematic diagram of a current control system of a DC/DC converter in an embodiment is shown, in which a hydrogen fuel cell system includes a hydrogen fuel cell stack 1, a current control system 2 of the DC/DC converter, and an energy storage cell 3. The DC/DC converter current control system 2 includes a DC/DC converter 21 and a DC/DC converter controller 20. The DC/DC converter 21 includes two DC/DC conversion units 22 connected in parallel. Each DC/DC conversion unit 22 includes an input current control circuit 24 and a direct current conversion circuit 23. The dc conversion circuit 23 is connected between the hydrogen fuel cell stack 1 and the energy storage cell 3 of the hydrogen fuel cell system, and is configured to step down the dc power output by the hydrogen fuel cell stack 1 and charge the energy storage cell 3. The input current control circuit 24 controls the current value of the input current of the hydrogen fuel cell stack 1 to the dc converter circuit 23. The DC converter controller 20 is used to connect the hydrogen fuel cell stack 1 and the BMS circuit of the energy storage cell 3, and is used to transmit start-up information to the hydrogen fuel cell stack 1 and to transmit a first input current control signal to the input current control circuit 24 of each DC/DC conversion unit 22, respectively, upon receiving a charge request message from the BMS circuit. The input current control circuits 24 of the two DC/DC conversion units 22 control the sum of the current values of the input currents of the hydrogen fuel cell stack 1 to the direct current conversion circuits 23 of the two DC/DC conversion units 22 to be a first preset current value in response to the first input current control signal. The first preset current value is smaller than the sum of the current values of the input currents of the direct current conversion circuits 23 of the two DC/DC conversion units 22 when the DC/DC converter 21 operates at the rated power. In one embodiment, the DC converter controller 20 is further configured to send a second input current control signal to the input current control circuit 24 of each DC/DC conversion unit 22 after the hydrogen fuel cell stack 1 is started for a first preset time. The input current control circuits 24 of the two DC/DC conversion units 22 control the sum of the current values of the input currents of the hydrogen fuel cell stack 1 to the direct current conversion circuits 23 of the two DC/DC conversion units 22 to be a second preset current value in response to the second input current control signal. Wherein the second preset current value is equal to the sum of the current values of the input currents of the direct current conversion circuits 23 of the two DC/DC conversion units 22 when the DC/DC converter 21 operates at the rated power.
In one embodiment, the DC conversion circuits 23 of the two DC/DC conversion units 22 adjust their respective input currents in an interleaving complementary manner to ensure that the sum of the current values of the input currents of the hydrogen fuel cell stack 1 to the DC conversion circuits 23 of the two DC/DC conversion units 22 is the first preset current value or the second preset current value. The DC conversion circuits 23 of the two DC/DC conversion units 22 adjust respective input currents in an interleaved complementary manner, and include:
when the input current of the direct current conversion circuit 23 of one DC/DC conversion unit 22 decreases, the input current of the direct current conversion circuit 23 of the other DC/DC conversion unit 22 increases. Wherein the increase value and the decrease value are the same.
In one embodiment, the DC/DC converter 21 further includes a CAN communication circuit 25. The CAN communication circuits 25 are connected to the input current control circuits 24 of the two DC/DC conversion units 22, respectively, and the input current control circuits 24 of the two DC/DC conversion units 22 mutually acquire the values of the input currents of the hydrogen fuel cell stack 1 to the respective DC conversion circuits 23. In one embodiment, each DC/DC conversion unit 22 includes a temperature monitoring module 26, and the temperature monitoring module 26 is used for monitoring the operating temperature of the DC conversion circuit 23. The CAN communication circuit 25 is connected to the temperature monitoring modules 25 of the two DC/DC conversion units 22, and is further used for the input current control circuits 24 of the two DC/DC conversion units 22 to mutually obtain the operating temperature of the DC conversion circuit 23. When the operating temperature of the direct current conversion circuit 23 of one DC/DC conversion unit 22 is higher than the operating temperature of the direct current conversion circuit 23 of another DC/DC conversion unit 22, the input current control circuit 24 of the DC/DC conversion unit 22 controls the current value of the input current to decrease by the first preset adjustment value, and the input current control circuit 24 of the other DC/DC conversion unit 22 controls the current value of the input current to increase by the first preset adjustment value.
In one embodiment, when the operating temperature of the DC conversion circuit 23 of each DC/DC conversion unit 22 is greater than a first preset temperature threshold, the sum of the current values of the input currents of the DC conversion circuits 23 of the two DC/DC conversion units 22 to the hydrogen fuel cell stack 1 is controlled to be a first preset current value. To reduce the output power of the DC/DC converter and prevent the DC/DC converter from overheating.
In an embodiment of the present application, a work flow of a DC/DC converter current control system includes:
the BMS obtains information of the energy storage battery in real time at the beginning, when the energy storage battery needs to be charged, the BMS sends the information needing to be charged to the DC-DC converter controller, when the DC-DC converter controller receives the instruction, the instruction is sent to the hydrogen fuel cell stack, when the hydrogen fuel cell stack receives the information and confirms the good state, the confirmation information is sent to the DC-DC converter controller, then the DC-DC converter controller sends the instruction to the DC/DC converter, the CAN communication circuit of the DC/DC converter confirms that the communication is normal, and after the two DC/DC converter units are initialized to be correct, the confirmation information is fed back to the DC-DC converter controller. The dc converter controller finally sends the confirmation information to the BMS circuit. After the charging is finished, the hydrogen fuel cell stack works, the direct current converter controller sends a current limiting command to the two DC/DC converter units, the DC/DC converter units start to regulate input current when receiving the control parameter command, so that the hydrogen fuel cell stack stably works, and the DC/DC converter units start to charge the energy storage cell. When the DC/DC converter starts to charge, the two DC/DC conversion units start to share current by adopting staggered complementation. Therefore, the overcurrent of a single DC/DC conversion unit and the overcurrent in the single DC/DC conversion unit are avoided, and the protection effect is achieved. The DC/DC converter also carries out temperature sampling detection, and when the temperature difference of the DC/DC conversion units is larger due to hardware difference among the DC/DC conversion units, the work of the DC/DC converter is influenced, and the input current of the DC/DC conversion units is intelligently regulated, so that the phenomenon that the temperature of the DC/DC converter is high, the power is reduced, and the phenomenon that the DC/DC converter module is damaged due to over-temperature can be avoided.
In one embodiment, when the DC/DC converter current control system operates, when the input currents of two DC/DC converter units are not equal, the communication is performed in real time through the CAN communication circuit, and after one DC/DC converter unit judges the current magnitude of the other DC/DC converter unit, the input currents are adjusted to make the input currents of the two DC/DC converter units equal, so as to avoid the damage to the DC/DC converter caused by the unequal input currents between the two DC/DC converter units. In one embodiment, when the DC/DC converters are in operation, the temperatures of the two DC/DC converters are sampled in real time, and when the temperatures between the two DC/DC conversion units are not equal, the temperatures of one DC/DC conversion unit and the other DC/DC conversion unit are subjected to magnitude judgment, so as to adjust the magnitude of the input current of the DC/DC conversion unit in real time. When the temperature of one DC/DC conversion unit is high, the input current regulation for regulating the DC/DC conversion unit becomes small, the input current regulation for regulating the other DC/DC conversion unit becomes large, and the DC/DC converter can always output at rated full power. The DC/DC converter can not only output at rated full power, but also maintain the safety and stability of the DC/DC converter.
In an embodiment of the present application, a DC/DC converter current control system for a hydrogen fuel cell system includes a DC/DC converter and a DC-DC converter controller, the DC/DC converter including two DC/DC conversion units connected in parallel, each DC/DC conversion unit including an input current control circuit and a DC conversion circuit. The method comprises the steps that charging request information sent by an energy storage battery is responded, starting information and a first input current control signal are sent to a hydrogen fuel cell stack and a DC/DC conversion unit respectively, two input current control circuits respond to the first input current control signal, the sum of current values of input currents of direct current conversion circuits of the two DC/DC conversion units input to the hydrogen fuel cell stack is controlled to be a first preset current value, and the first preset current value is smaller than the input current value of a DC/DC converter at rated power. Because the low-power output of the DC/DC converter is set at the initial starting stage of the hydrogen fuel cell stack, the probability that the hydrogen fuel cell stack can damage the energy storage cell due to unstable operation at the initial starting stage is reduced.
Example two:
referring to fig. 2, which is a schematic flow chart of a current control method of a DC/DC converter in another embodiment, a DC/DC converter of a hydrogen fuel cell system includes two DC/DC conversion units connected in parallel, each DC/DC conversion unit includes an input current control circuit and a DC conversion circuit, the DC conversion circuit is connected between a hydrogen fuel cell stack and an energy storage cell of the hydrogen fuel cell system, and is configured to step down a DC output by the hydrogen fuel cell stack and then charge the energy storage cell, and the input current control circuit is configured to control a current value of an input current input to the DC conversion circuit by the hydrogen fuel cell stack. The DC/DC converter current control method comprises the following steps:
step one, starting the cell stack and setting an input current value.
And responding to the charging request information sent by the energy storage battery of the hydrogen fuel cell system, sending starting information to the hydrogen fuel cell stack, and respectively sending a first input current control signal to the input current control circuit of each DC/DC conversion unit.
And step two, the DC/DC converter outputs power according to the first preset value.
The input current control circuits of the two DC/DC conversion units of the DC/DC converter respond to the first input current control signal and control the sum of the current values of the input currents of the hydrogen fuel cell stack input into the direct current conversion circuits of the two DC/DC conversion units to be a first preset current value. The first preset current value is smaller than the sum of current values of input currents of direct current conversion circuits of the two DC/DC conversion units when the DC/DC converter works at rated power.
In one embodiment, the DC/DC converter current control method further includes:
and step three, the DC/DC converter outputs power according to a second preset value.
And after the hydrogen fuel cell stack starts for a first preset time, respectively sending a second input current control signal to the input current control circuit of each DC/DC conversion unit. And the input current control circuits of the two DC/DC conversion units respond to the second input current control signal and control the sum of the current values of the input currents of the hydrogen fuel cell stack and the direct current conversion circuits of the two DC/DC conversion units to be a second preset current value. The second preset current value is equal to the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units when the DC/DC converter operates at rated power.
In one embodiment, the DC/DC converter current control method further includes:
and step four, outputting power by the two DC/DC conversion units according to the interleaving complementation.
And the direct current conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaving complementary mode so as to ensure that the sum of the current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units input into the hydrogen fuel cell stack is a first preset current value or a second preset value. When the input current of the direct current conversion circuit of one DC/DC conversion unit decreases, the input current of the direct current conversion circuit of the other DC/DC conversion unit increases. The DC/DC converter also comprises a CAN communication circuit, the CAN communication circuit is respectively connected with the input current control circuits of the two DC/DC conversion units, and the input current control circuits of the two DC/DC conversion units are used for mutually acquiring the value of the input current of the hydrogen fuel cell stack input into the respective DC conversion circuits.
The current sharing method and the current sharing device mainly solve the problem of current sharing between the two DC/DC conversion units, when the sampling of the input current in the DC/DC conversion units is different, the DC/DC converter can better realize the current sharing through the communication between the DC/DC conversion units, and the damage of the DC/DC converter due to overhigh current caused by the difference of hardware in the operation process of the DC/DC converter is avoided. In one embodiment, the temperature difference between the DC/DC conversion units can be monitored in real time during the operation of the DC/DC converter, and communication is performed, so that the output power between the DC/DC converters can be adjusted in real time, and full power can be supplied to the energy storage battery and the electric equipment in real time.
In an embodiment of the present application, an input current parameter of the other side is obtained through real-time communication between two DC/DC conversion units, and a current between the DC/DC conversion units is adjusted through a complementary interleaving adjustment manner, so that the currents between the two DC/DC conversion units are equal. In one embodiment, the DC/DC converter performs multi-path interleaved output to obtain information of each drive in real time, when a certain drive is damaged in the DC/DC converter, the damaged drive is closed by the DC/DC converter, and the DC/DC converter continues to work, so that the phenomenon that the DC/DC converter cannot work due to the damage of hardware drive in the DC/DC converter is avoided. In one embodiment, the temperatures of the plurality of DC/DC conversion units are collected in real time on the basis of equal current, when the temperature difference between the plurality of DC/DC conversion units is large, the DC/DC conversion unit with high temperature inputs small current, and the DC/DC conversion unit with low temperature inputs high current, so that the full power output of the DC/DC converter can be met, and the risk of damaging the DC/DC converter between each DC/DC conversion unit due to high temperature caused by hardware difference of the DC/DC conversion units can be avoided.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A DC/DC converter current control system for a hydrogen fuel cell system, comprising a DC/DC converter and a DC-DC converter controller;
the DC/DC converter comprises two DC/DC conversion units connected in parallel;
each DC/DC conversion unit comprises an input current control circuit and a direct current conversion circuit; the direct current conversion circuit is connected between a hydrogen fuel cell stack of the hydrogen fuel cell system and an energy storage cell and is used for reducing the direct current output by the hydrogen fuel cell stack and then charging the energy storage cell; the input current control circuit is used for controlling the current value of the input current of the hydrogen fuel cell stack to the direct current conversion circuit;
the direct current converter controller is used for connecting the hydrogen fuel cell stack and a BMS circuit of the energy storage battery, and is used for sending starting information to the hydrogen fuel cell stack and sending a first input current control signal to an input current control circuit of each DC/DC conversion unit respectively when receiving charging request information sent by the BMS circuit;
the input current control circuits of the two DC/DC conversion units respond to the first input current control signal and control the sum of current values of input currents of the hydrogen fuel cell stack and the direct current conversion circuits of the two DC/DC conversion units to be a first preset current value; when the DC/DC converter works at rated power, the first preset current value is smaller than the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
2. The DC/DC converter current control system of claim 1, wherein the DC/DC converter controller is further configured to send a second input current control signal to the input current control circuit of each DC/DC converter unit after the hydrogen fuel cell stack is started for a first preset time;
the input current control circuits of the two DC/DC conversion units respond to the second input current control signal and control the sum of current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units, which are input into the hydrogen fuel cell stack, to be a second preset current value; and when the DC/DC converter works at rated power, the second preset current value is equal to the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
3. The DC/DC converter current control system according to claim 2, wherein the DC converter circuits of the two DC/DC converter units adjust the respective input currents in an interleaved complementary manner to ensure that the sum of the current values of the input currents of the hydrogen fuel cell stack to the DC converter circuits of the two DC/DC converter units is the first preset current value or the second preset current value.
4. The DC/DC converter current control system of claim 3, wherein the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, comprising:
when the input current of the direct current conversion circuit of one DC/DC conversion unit is reduced, the input current of the direct current conversion circuit of the other DC/DC conversion unit is increased;
the DC/DC converter also comprises a CAN communication circuit; the CAN communication circuit is respectively connected with the input current control circuits of the two DC/DC conversion units, and the input current control circuits of the two DC/DC conversion units are used for mutually acquiring the value of the input current of the hydrogen fuel cell stack input into the respective DC conversion circuits.
5. The DC/DC converter current control system of claim 4, wherein the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, further comprising:
each DC/DC conversion unit further comprises a temperature monitoring module, and the temperature monitoring module is used for monitoring the working temperature of the DC conversion circuit;
the CAN communication circuit is respectively connected with the temperature monitoring modules of the two DC/DC conversion units and is also used for the input current control circuits of the two DC/DC conversion units to mutually acquire the working temperature of the DC conversion circuit;
when the working temperature of the direct current conversion circuit of one DC/DC conversion unit is higher than that of the direct current conversion circuit of the other DC/DC conversion unit, the input current control circuit of the DC/DC conversion unit controls the current value of the input current to decrease by a first preset adjusting value, and the input current control circuit of the other DC/DC conversion unit controls the current value of the input current to increase by the first preset adjusting value.
6. The DC/DC converter current control system of claim 5, wherein the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, further comprising:
and when the working temperature of the direct current conversion circuit of each DC/DC conversion unit is greater than a first preset temperature threshold value, controlling the sum of the current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units input into the hydrogen fuel cell stack to be a first preset current value.
7. A DC/DC converter current control method for a hydrogen fuel cell system, characterized by comprising:
the hydrogen fuel cell system DC/DC converter includes two DC/DC conversion units connected in parallel, each of the DC/DC conversion units including an input current control circuit and a direct current conversion circuit; the direct current conversion circuit is connected between a hydrogen fuel cell stack of the hydrogen fuel cell system and an energy storage cell and is used for reducing the direct current output by the hydrogen fuel cell stack and then charging the energy storage cell; the input current control circuit is used for controlling the current value of the input current of the hydrogen fuel cell stack to the direct current conversion circuit;
responding to charging request information sent by an energy storage battery of the hydrogen fuel cell system, sending starting information to the hydrogen fuel cell stack, and respectively sending a first input current control signal to an input current control circuit of each DC/DC conversion unit;
the input current control circuits of the two DC/DC conversion units respond to the first input current control signal and control the sum of current values of input currents of the hydrogen fuel cell stack and the direct current conversion circuits of the two DC/DC conversion units to be a first preset current value; when the DC/DC converter works at rated power, the first preset current value is smaller than the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
8. The method of claim 7, further comprising:
after the hydrogen fuel cell stack is started for a first preset time, respectively sending a second input current control signal to the input current control circuit of each DC/DC conversion unit;
the input current control circuits of the two DC/DC conversion units respond to the second input current control signal and control the sum of current values of the input currents of the direct current conversion circuits of the two DC/DC conversion units, which are input into the hydrogen fuel cell stack, to be a second preset current value; and when the DC/DC converter works at rated power, the second preset current value is equal to the sum of current values of input currents of the direct current conversion circuits of the two DC/DC conversion units.
9. The method according to claim 8, wherein the DC converter circuits of the two DC/DC converter units adjust the respective input currents in an interleaved complementary manner to ensure that the sum of the current values of the input currents of the hydrogen fuel cell stack to the DC converter circuits of the two DC/DC converter units is the first preset current value or the second preset current value.
10. The method of claim 9, wherein the DC conversion circuits of the two DC/DC conversion units regulate respective input currents in an interleaved complementary manner, comprising:
when the input current of the direct current conversion circuit of one DC/DC conversion unit is reduced, the input current of the direct current conversion circuit of the other DC/DC conversion unit is increased;
the DC/DC converter also comprises a CAN communication circuit; the CAN communication circuit is respectively connected with the input current control circuits of the two DC/DC conversion units, and the input current control circuits of the two DC/DC conversion units are used for mutually acquiring the value of the input current of the hydrogen fuel cell stack input into the respective DC conversion circuits.
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