CN114834324A - Fuel cell power control method and system, power system and vehicle - Google Patents
Fuel cell power control method and system, power system and vehicle Download PDFInfo
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- CN114834324A CN114834324A CN202110143935.5A CN202110143935A CN114834324A CN 114834324 A CN114834324 A CN 114834324A CN 202110143935 A CN202110143935 A CN 202110143935A CN 114834324 A CN114834324 A CN 114834324A
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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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- 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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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
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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Abstract
The invention relates to the field of fuel cell vehicles, in particular to a fuel cell power control method and system, a power system and a vehicle, wherein the charge state of a power cell is divided into a plurality of state intervals, and the power cell output power and the fuel cell output power calculation method corresponding to each state interval are respectively set; the fuel cell vehicle can output enough power, the efficient utilization of the energy of the fuel cell is realized, the SOC of the power cell is maintained in a certain range, the energy utilization efficiency of the fuel cell vehicle is improved, and the service lives of the fuel cell and the power cell are prolonged.
Description
Technical Field
The invention relates to the field of fuel cell vehicles, in particular to a fuel cell power control method and system, a power system and a vehicle.
Background
The fuel cell vehicle mainly adopts a mode of connecting the fuel cell and the power cell in parallel as the energy output of the whole vehicle. To extend the service life of the fuel cell, it is necessary to reduce the degree of load variation of the fuel cell. The current common scheme is that the fuel cell provides the steady-state power requirement of the vehicle, the power cell provides the transient power requirement of the vehicle, and the power cell plays the roles of peak clipping and valley filling and lightens the severe load change degree of the fuel cell. In order to maintain the dynamic property of the whole fuel cell vehicle, the SOC (state of charge) of the power cell needs to be kept at a certain level, and the power cell is prevented from being damaged by overcharge; when the SOC of the power battery is low, the fuel battery is required to charge the power battery in time, and when the SOC of the power battery is high, the power battery is required to discharge in time.
In the prior art, the adopted scheme comprises: when the SOC of the power battery is lower than the target value, the fuel battery charges the power battery, and meanwhile, the fuel battery also responds to the power required by the whole vehicle; when the SOC of the power battery is higher than a target value, the power battery and the fuel battery jointly follow the power required by the whole vehicle; when the power battery is at the target SOC, only the power of the fuel battery follows the power required by the whole vehicle. The fuel cell outputs at a fixed power point within a period of time, and when the required power of the whole vehicle is greater than the fixed power output of the fuel cell, the power cell discharges and outputs the rest power; when the required power of the whole vehicle is smaller than the fixed point power output of the fuel cell, the power cell is charged and absorbs the rest power. The energy management algorithm of the fuel cell vehicle can reduce the load change degree of the fuel cell and ensure that the SOC of the power cell is in a target range, but the energy utilization efficiency of a power system of the fuel cell is low, so that the energy consumption waste is caused.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide a fuel cell power control method and system, a power system, and a vehicle, which overcome or at least partially solve the above problems, and reduce the degree of load variation of a fuel cell while ensuring sufficient power performance of the fuel cell vehicle, and enable the fuel cell vehicle to have higher energy utilization efficiency.
As an aspect of an embodiment of the present invention, there is provided a fuel cell power control method including,
dividing a plurality of state intervals according to the charge state of the power battery, and respectively setting a calculation method of the output power of the power battery and the output power of the fuel battery corresponding to each state interval;
detecting the charge state of the power battery and determining a state interval;
and determining the output power of the power battery and the output power of the fuel battery through corresponding calculation methods.
Further, the control method includes,
setting the division values of the charge states as a first division value, a second division value, a third division value, a fourth division value, a fifth division value and a sixth division value;
dividing the state interval of the charge state of the power battery into a first state interval, a second state interval, a third state interval, a fourth state interval, a fifth state interval, a sixth state interval and a seventh state interval according to the division value,
the first state interval is a power-deficient state interval from 0% to the first division value, the second state interval is a weak state interval from the first division value to the second division value, the third state interval is a sub-health level interval from the second division value to the third division value, the fourth state interval is a health level interval from the third division value to the fourth division value, the fifth state interval is a saturation level interval from the fourth division value to the fifth division value, the sixth state interval is a supersaturation level interval from the fifth division value to the sixth division value, and the seventh state interval is an overcharge-preventing level interval from the sixth division value to 100%.
Further, the first division value is set to be 10-15%, the second division value is set to be 15-25%, the third division value is set to be 25-50%, the fourth division value is set to be 50-70%, the fifth division value is set to be 70-80%, and the sixth division value is set to be 80-90%.
Further, the control method comprises the step of respectively determining the output power of the power battery and the output power of the fuel battery according to the required power of the whole vehicle, the rated power of the fuel battery, the power corresponding to the highest efficiency of the fuel battery, the efficiency corresponding to the actual operation of the fuel battery and the highest efficiency of the fuel battery.
Further, the control method includes,
when the charge state of the power battery is in a first state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is stopped;
when the charge state of the power battery is in a second state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel battery and the required power of the whole vehicle;
when the charge state of the power battery is in a third state interval, adjusting the output power of the charged fuel battery and the output power of the power battery according to the efficiency corresponding to the actual operation of the fuel battery;
when the charge state of the power battery is in a fourth state interval, judging whether the fuel battery is at the highest efficiency point, if so, charging the power battery, and if not, the fuel battery follows the power demand of the whole vehicle;
when the charge state of the power battery is in a fifth state interval, the fuel battery stops charging the power battery and follows the required power of the whole vehicle, and the output power of the power battery is determined according to the output power of the fuel battery and the required power of the whole vehicle;
when the charge state of the power battery is in a sixth state interval, limiting the output power of the fuel battery to be smaller than the required power of the whole vehicle according to the efficiency corresponding to the actual operation of the fuel battery, and discharging the power battery;
and when the state of charge of the power battery is in the seventh state interval, the fuel battery stops outputting power, the power battery only outputs power, and charging is stopped.
Further, the control method includes,
when the state of charge of the power battery is in a first state interval, the output power of the fuel battery is as follows: p FC ＝P FCreted And the output power of the power battery is as follows: p BAT ＝0；
When the state of charge of the power battery is in the second state interval, the output power of the fuel battery is as follows: p is FC ＝P FCreted And the output power of the power battery is as follows: p BAT ＝P FCrated -P Veh ；
When the state of charge of the power battery is in the third state interval, the output power of the fuel battery is as follows: p FC ＝P Veh -P BAT And the output power of the power battery is as follows: p is BAT ＝-λ 1 ·λ 2 ·(P FCrated -P Veh ) Wherein
λ 2 And determining according to the current charge state value and the division value of the state interval.
When the state of charge of the power battery is in the fourth state interval, the output power of the fuel battery is as follows:
the output power of the power battery is as follows: p BAT ＝P FC -P Veh ；
When the state of charge of the power battery is in the fifth state interval, the output power of the fuel battery is as follows: p FC ＝P Veh And the output power of the power battery is as follows: p BAT ＝P FC -P Veh ；
When the state of charge of the power battery is in the sixth state interval, the output power of the fuel battery is as follows: p is FC ＝λ 3 ·λ 4 ·P Veh Wherein
λ 4 According to the current state of charge value and the division value of the state interval, the output power of the power battery is as follows: p BAT ＝P Veh -P FC ；
When the state of charge of the power battery is in the seventh state interval, the output power of the fuel battery is as follows: p FC 0, powerThe output power of the battery is as follows: p BAT ＝P Veh ；
Wherein, P FC Outputting power for the fuel cell; p BAT Outputting power for the power battery; p FCrated Rated power for the fuel cell; p Veh In order to meet the power requirement of the whole vehicle,
the power corresponding to the highest efficiency point of the fuel cell;
efficiency, η, corresponding to the actual operation of the fuel cell max Is the highest efficiency of the fuel cell.
Further, said λ 2 Is (third division value-current state of charge value)/(third division value-second division value); said lambda 4 Is (fifth division value-current state of charge value)/(sixth division value-fifth division value).
As a further aspect of the embodiments of the present invention, there is provided a fuel cell power control system including,
the device comprises a presetting module, a calculating module and a control module, wherein the presetting module is used for dividing a plurality of state intervals according to the charge state of the power battery and respectively setting the power battery output power and the fuel battery output power calculating method corresponding to each state interval;
the detection module is used for detecting the charge state of the power battery and determining a state interval;
and the calculation module is used for determining the output power of the power battery and the output power of the fuel battery through corresponding calculation methods.
As a further aspect of the embodiments of the present invention, there is provided a power system including a fuel cell, a dc chopper, a power cell, an inverter, and a motor, which are connected in this order, the fuel cell being connected in parallel with the power cell, the fuel cell and the power cell being controlled by the fuel cell power control system as in the above embodiments.
As another aspect of the embodiments of the invention, there is provided a vehicle that controls a power system by the fuel cell power control method according to any one of the above embodiments, or that includes the power system according to the above embodiment.
The embodiment of the invention at least realizes the following technical effects:
in the embodiment of the invention, the charge state of the power battery is divided into a plurality of state intervals, and the output power of the power battery and the output power of the fuel battery corresponding to each state interval are respectively set; the fuel cell vehicle can output enough power, the efficient utilization of the energy of the fuel cell is realized, the SOC of the power cell is maintained in a certain range, the energy utilization efficiency of the fuel cell vehicle is improved, and the service lives of the fuel cell and the power cell are prolonged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The object and other advantages of the present invention can be achieved and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a fuel cell power control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the state of charge partitioning of a power battery according to an embodiment of the present invention;
FIG. 3 is a flow chart of a fuel cell power control method according to yet another embodiment of the present invention;
FIG. 4 is a schematic diagram of a fuel cell power control system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a powertrain according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The figures and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
In one embodiment, as shown in fig. 1, there is provided a fuel cell power control method, the control method comprising,
s11, dividing a plurality of state intervals according to the charge state of the power battery, and respectively setting a calculation method of the output power of the power battery and the output power of the fuel battery corresponding to each state interval;
s12, detecting the charge state of the power battery and determining a state interval;
s13 determines the power cell output power and the fuel cell output power by the corresponding calculation methods.
In the embodiment, the state of charge (SOC) of the power battery is divided, different power battery output powers and calculation methods of the fuel battery output powers are set for each state interval, and the fuel battery power is controlled according to the required power of the whole vehicle and the SOC of the power battery according to the proposed calculation methods, so that the control logic of the fuel battery energy management is realized.
In one embodiment, as shown in fig. 2, the control method includes,
setting the division values of the charge states as a first division value, a second division value, a third division value, a fourth division value, a fifth division value and a sixth division value;
dividing the state interval of the charge state of the power battery into a first state interval, a second state interval, a third state interval, a fourth state interval, a fifth state interval, a sixth state interval and a seventh state interval according to the division value,
the first state interval is a power-deficient state interval from 0% to a first division value, the second state interval is a weak state interval from the first division value to a second division value, the third state interval is a sub-health level interval from the second division value to a third division value, the fourth state interval is a health level interval from the third division value to a fourth division value, the fifth state interval is a saturation level interval from the fourth division value to the fifth division value, the sixth state interval is a supersaturation level interval from the fifth division value to the sixth division value, and the seventh state interval is an anti-overcharging level interval from the sixth division value to 100%.
In the embodiment, the state of charge is divided into 7 intervals, and the division in different proportions can be performed according to the conditions of different power batteries, and the division can also be distributed evenly, and can be adjusted according to specific conditions.
In one embodiment, the first division value is set to 10-15%, the second division value is set to 15-25%, the third division value is set to 25-50%, the fourth division value is set to 50-70%, the fifth division value is set to 70-80%, and the sixth division value is set to 80-90% in consideration of the power cell and the fuel cell as a whole. In this embodiment, the power consumption utilization rate can be improved more effectively, and the first division value setting may be 10%, 12%, 15%; the second division value may be 15%, 20%, 25%; the third division value may be 25%, 30%, 40%, 50%; the fourth division value may be 50%, 60%, 70%; the fifth division value may be 70%, 75%, 80%; the sixth division value may be 80%, 85%, 90%.
In one embodiment, the control method comprises the step of respectively determining the output power of the power battery and the output power of the fuel battery according to the required power of the whole vehicle, the rated power of the fuel battery, the power corresponding to the highest efficiency of the fuel battery, the efficiency corresponding to the actual operation of the fuel battery and the highest efficiency of the fuel battery. The required power of the whole vehicle and the rated power of the fuel cell in the embodiment can be directly obtained as inherent parameters, the power corresponding to the highest efficiency of the fuel cell, the efficiency corresponding to the actual operation of the fuel cell and the highest efficiency of the fuel cell can be obtained by obtaining a relevant chart according to the test on the fuel cell and then checking the chart, and corresponding data can be stored in a system before operation and can be directly obtained by conversion when needed.
In one embodiment, the control method includes defining each state interval level of the power battery SOC, and dividing the state interval level into 7 sections, wherein each section is defined as:
when the charge state of the power battery is in a first state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is stopped; in the first state interval, power battery SOC is in insufficient voltage level, and in order to prevent that power battery from discharging excessively, power battery no longer output power realizes power battery self protection.
When the charge state of the power battery is in a second state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel battery and the required power of the whole vehicle; in the second state interval, the SOC of the power battery is at a weak level, and the fuel battery needs to be charged to a second set value level as soon as possible, so as to ensure that the power system can output the maximum requested power for a period of time.
When the charge state of the power battery is in a third state interval, adjusting the output power of the charged fuel battery and the output power of the power battery according to the efficiency corresponding to the actual operation of the fuel battery; in the third state interval, the SOC of the power battery is in a sub-healthy level, so that the fuel battery is charged more in a high-efficiency area and less in a low-efficiency area, and the energy of the power system is efficiently utilized.
When the charge state of the power battery is in a fourth state interval, judging whether the fuel battery is at the highest efficiency point, if so, charging the power battery, and if not, the fuel battery follows the power demand of the whole vehicle; the SOC of the power battery is kept at a healthy level, the fuel battery charges the power battery only at the highest efficiency point, and the power battery needs power according to the whole vehicle under other conditions.
When the charge state of the power battery is in a fifth state interval, the fuel battery stops charging the power battery and follows the required power of the whole vehicle, and the output power of the power battery is determined according to the output power of the fuel battery and the required power of the whole vehicle; the SOC of the power battery is at a saturation level, and the fuel battery does not charge the power battery and only follows the power of the whole vehicle.
When the charge state of the power battery is in a sixth state interval, limiting the output power of the fuel battery to be smaller than the required power of the whole vehicle according to the efficiency corresponding to the actual operation of the fuel battery, and discharging the power battery; the SOC of the power battery is in a supersaturation level, the fuel battery does not follow the power of the whole vehicle any more and is always smaller than the power of the whole vehicle, and the power battery is enabled to actively discharge.
And when the state of charge of the power battery is in the seventh state interval, the fuel battery stops outputting power, the power battery only outputs power, and charging is stopped. The irreversible loss of the power battery caused by overcharge can be prevented, the power battery only outputs power and does not recover energy, and the power battery is protected.
In the present embodiment, in order to maintain the dynamic performance of the fuel cell vehicle, the SOC of the power cell is maintained within a certain range, and different control logics are provided in different state sections, so that the calculation formula can be further determined.
In one embodiment, as described with reference to fig. 3, the control method includes,
s200, starting a control method;
s201, detecting in real time to obtain the SOC of the power battery;
s202, judging whether the charge state of the power battery is in a first state interval or not, if so, turning to S203, and if not, turning to S205;
s203, prohibiting the power battery from discharging;
s204, the output power of the fuel cell is as follows: p FC ＝P FCreted And the output power of the power battery is as follows: p BAT ＝0；
S205, judging whether the charge state of the power battery is in a second state interval, if so, turning to S206, and if not, turning to S208;
s206, starting a maximum power charging mode;
s207 the fuel cell output power is: p FC ＝P FCreted And the output power of the power battery is as follows: p BAT ＝P FCrated -P Veh ；
S208, judging whether the charge state of the power battery is in a third state interval, if so, turning to S209, and if not, turning to S211;
s209, starting an economical charging mode;
s210, the output power of the fuel cell is as follows: p FC ＝P Veh -P BAT And the output power of the power battery is as follows: p is BAT ＝-λ 1 ·λ 2 ·(P FCrated -P Veh ) In which
λ 2 And determining according to the current charge state value and the division value of the state interval.
S211, judging whether the charge state of the power battery is in a fourth state interval, if so, turning to S212, and if not, turning to S214;
s212, starting a highest economic point charging or power mode along with the whole vehicle;
s213 the fuel cell output power is:
the output power of the power battery is as follows: p is BAT ＝P FC -P Veh ；
S214, judging that the charge state of the power battery is in a fifth state interval, if so, turning to S215, and if not, turning to S217;
s215, starting to follow the power of the whole vehicle, and freely balancing a power battery;
s216 the output power of the fuel cell is: p FC ＝P Veh And the output power of the power battery is as follows: p is BAT ＝P FC -P Veh ；
S217 determines that the state of charge of the power battery is in the sixth state interval, if yes, go to S218, and if no, go to S220;
s218, starting to limit the power of the fuel cell and discharging economically;
and S219, the output power of the fuel cell is as follows: p FC ＝λ 3 ·λ 4 ·P Veh Wherein
λ 4 According to the current state of charge value and the division value in the state interval, the output power of the power battery is as follows: p BAT ＝P Veh -P FC ；
S220, starting a charging prohibition mode of the power battery;
s221 the output power of the fuel cell is: p FC When the output power of the power battery is 0: p BAT ＝P Veh ；
S222 ends.
Wherein, P FC Outputting power for the fuel cell; p BAT Outputting power for the power battery; p FCrated Rated power for the fuel cell; p Veh In order to meet the power requirement of the whole vehicle,
the power corresponding to the highest efficiency point of the fuel cell;
efficiency, η, corresponding to the actual operation of the fuel cell max Is the highest efficiency of the fuel cell.
Preferably, said λ 2 Is (third division value-current state of charge value)/(third division value-second division value); said lambda 4 Is (fifth division value-current state of charge value)/(sixth division value-fifth division value).
Based on the same inventive concept, in one embodiment, as shown in fig. 4, there is provided a fuel cell power control system, including,
the preset module 11 is used for dividing a plurality of state intervals according to the charge state of the power battery, and respectively setting a calculation method of the output power of the power battery and the output power of the fuel battery corresponding to each state interval;
the detection module 12 is used for detecting the charge state of the power battery and determining a state interval;
and the calculating module 13 is used for determining the output power of the power battery and the output power of the fuel battery through corresponding calculating methods.
Based on the same inventive concept, as shown in fig. 5, in one embodiment, a power system is provided, which includes a fuel cell 21, a direct current chopper (DCDC)22, a power cell 23, an inverter 24, and a motor 25, which are connected in sequence, the fuel cell being connected in parallel with the power cell, and the fuel cell and the power cell being controlled by the fuel cell power control system as described in the above embodiment.
In this embodiment, the load change condition of the fuel cell 21 shortens its operating life, so the power loading slope of the fuel cell tends to be small, providing only steady state power output. In order to meet the instantaneous power requirement of the vehicle, the fuel cell and the power cell are connected in parallel to provide power for the driving motor of the whole vehicle. When the power of the fuel cell does not meet the power required by the whole vehicle, the residual power request is provided by the power battery.
Based on the same inventive concept, in one embodiment, there is provided a vehicle that controls a power system by the fuel cell power control method according to any one of the above embodiments, or that includes the power system according to any one of the above embodiments.
The use of ordinal numbers such as "first," "second," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or the order of one element in another, but are used merely to distinguish one element having a certain name from another element having a same name.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the invention should not be construed to reflect the intent: that the invention as claimed requires more features than are expressly recited in each claim. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A fuel cell power control method, characterized by comprising,
dividing a plurality of state intervals according to the charge state of the power battery, and respectively setting a calculation method of the output power of the power battery and the output power of the fuel battery corresponding to each state interval;
detecting the charge state of the power battery and determining a state interval;
and determining the output power of the power battery and the output power of the fuel battery through corresponding calculation methods.
2. The fuel cell power control method according to claim 1, characterized by comprising,
setting the division values of the charge states as a first division value, a second division value, a third division value, a fourth division value, a fifth division value and a sixth division value;
dividing the state interval of the charge state of the power battery into a first state interval, a second state interval, a third state interval, a fourth state interval, a fifth state interval, a sixth state interval and a seventh state interval according to the division value,
the first state interval is a power-deficient state interval from 0% to the first division value, the second state interval is a weak state interval from the first division value to the second division value, the third state interval is a sub-health level interval from the second division value to the third division value, the fourth state interval is a health level interval from the third division value to the fourth division value, the fifth state interval is a saturation level interval from the fourth division value to the fifth division value, the sixth state interval is a supersaturation level interval from the fifth division value to the sixth division value, and the seventh state interval is an overcharge-preventing level interval from the sixth division value to 100%.
3. The fuel cell power control method according to claim 2, wherein the first division value is set to 10-15%, the second division value is set to 15-25%, the third division value is set to 25-50%, the fourth division value is set to 50-70%, the fifth division value is set to 70-80%, and the sixth division value is set to 80-90%.
4. The fuel cell power control method according to claim 2, wherein the control method comprises determining the power cell output power and the fuel cell output power respectively according to the power required by the whole vehicle, the rated power of the fuel cell, the power corresponding to the highest efficiency point of the fuel cell, the efficiency corresponding to the actual operation of the fuel cell and the highest efficiency point of the fuel cell.
5. The fuel cell power control method according to claim 2, characterized by comprising,
when the charge state of the power battery is in a first state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is stopped;
when the charge state of the power battery is in a second state interval, the output power of the fuel battery is rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel battery and the required power of the whole vehicle;
when the charge state of the power battery is in a third state interval, adjusting the output power of the charged fuel battery and the output power of the power battery according to the efficiency corresponding to the actual operation of the fuel battery;
when the charge state of the power battery is in a fourth state interval, judging whether the fuel battery is at the highest efficiency point, if so, charging the power battery, and if not, the fuel battery follows the power demand of the whole vehicle;
when the charge state of the power battery is in a fifth state interval, the fuel battery stops charging the power battery and follows the required power of the whole vehicle, and the output power of the power battery is determined according to the output power of the fuel battery and the required power of the whole vehicle;
when the charge state of the power battery is in a sixth state interval, limiting the output power of the fuel battery to be smaller than the required power of the whole vehicle according to the efficiency corresponding to the actual operation of the fuel battery, and discharging the power battery;
and when the state of charge of the power battery is in the seventh state interval, the fuel battery stops outputting power, the power battery only outputs power, and charging is stopped.
6. The fuel cell power control method according to claim 5, characterized by comprising,
when the state of charge of the power battery is in a first state interval, the output power of the fuel battery is as follows: p FC ＝P FCreted And the output power of the power battery is as follows: p is BAT ＝0；
When the state of charge of the power battery is in the second state interval, the output power of the fuel battery is as follows: p FC ＝P FCreted And the output power of the power battery is as follows: p BAT ＝P FCrated -P Veh ；
When the state of charge of the power battery is in a third state interval, the fuel is burntThe output power of the material battery is as follows: p is FC ＝P Veh -P BAT And the output power of the power battery is as follows: p BAT ＝-λ 1 ·λ 2 ·(P FCrated -P Veh ) Wherein
λ 2 And determining according to the current charge state value and the division value of the state interval.
When the state of charge of the power battery is in the fourth state interval, the output power of the fuel battery is as follows:
the output power of the power battery is as follows: p BAT ＝P FC -P Veh ；
When the state of charge of the power battery is in the fifth state interval, the output power of the fuel battery is as follows: p FC ＝P Veh And the output power of the power battery is as follows: p BAT ＝P FC -P Veh ；
When the state of charge of the power battery is in the sixth state interval, the output power of the fuel battery is as follows: p FC ＝λ 3 ·λ 4 ·P Veh Wherein
λ 4 According to the current state of charge value and the division value in the state interval, the output power of the power battery is as follows: p BAT ＝P Veh -P FC ；
When the state of charge of the power battery is in the seventh state interval, the output power of the fuel battery is as follows: p FC When the output power of the power battery is 0: p BAT ＝P Veh ；
Wherein, P FC Outputting power for the fuel cell; p BAT Outputting power for the power battery; p is FCrated Rated power for the fuel cell; p Veh In order to meet the power requirement of the whole vehicle,
the power corresponding to the highest efficiency point of the fuel cell; eta PFC Efficiency, η, corresponding to the actual operation of the fuel cell max Is the highest efficiency of the fuel cell.
7. The fuel cell power control method of claim 6, wherein λ 2 Is (third division value-current state of charge value)/(third division value-second division value); said lambda 4 Is (fifth division value-current state of charge value)/(sixth division value-fifth division value).
8. A fuel cell power control system, characterized by comprising,
the device comprises a presetting module, a calculating module and a control module, wherein the presetting module is used for dividing a plurality of state intervals according to the charge state of the power battery and respectively setting the power battery output power and the fuel battery output power calculating method corresponding to each state interval;
the detection module is used for detecting the charge state of the power battery and determining a state interval;
and the calculation module is used for determining the output power of the power battery and the output power of the fuel battery through corresponding calculation methods.
9. A power system characterized in that the power system comprises a fuel cell, a dc chopper, a power cell, an inverter and a motor, which are connected in sequence, the fuel cell is connected in parallel with the power cell, and the fuel cell and the power cell are controlled by the fuel cell power control system according to claim 8.
10. A vehicle characterized in that the vehicle controls a power system by the fuel cell power control method according to any one of claims 1 to 7, or the vehicle includes the power system according to claim 9.
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| CN116022035A (en) * | 2023-01-17 | 2023-04-28 | 宇通客车股份有限公司 | Power system of fuel cell heavy truck, energy management method and device |
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| CN116022035A (en) * | 2023-01-17 | 2023-04-28 | 宇通客车股份有限公司 | Power system of fuel cell heavy truck, energy management method and device |
| CN116022035B (en) * | 2023-01-17 | 2024-04-05 | 宇通客车股份有限公司 | Power system of fuel cell heavy truck, energy management method and device |
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