CN110884364A - Power tracking-based electric vehicle hybrid power supply control method - Google Patents
Power tracking-based electric vehicle hybrid power supply control method Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims abstract description 128
- 238000005265 energy consumption Methods 0.000 claims abstract description 9
- 230000001133 acceleration Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
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- 238000007599 discharging Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by capacitors
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention belongs to the technical field of electric automobile hybrid power supplies, relates to how to control energy supply of the electric automobile hybrid power supplies, in particular to a power tracking-based electric automobile hybrid power supply control method, and solves the technical problems in the background art. The following technical scheme is adopted: energy consumption resistors are added at two ends of the super capacitor, and a second unidirectional DC/DC converter is added between the storage battery and a driving motor of the electric automobile. The control method of the hybrid power supply of the electric automobile can coordinate and control the output of the energy of the storage battery and the super capacitor according to the change of the required power of the electric automobile and recover the energy of the super capacitor during braking, can realize reasonable distribution of the power between the storage battery and the super capacitor in the hybrid power supply, and quickens the response speed of the vehicle when high power is required; the electric automobile can run more stably and efficiently.
Description
Technical Field
The invention belongs to the technical field of electric automobile hybrid power supplies, relates to how to control energy supply of the electric automobile hybrid power supplies, and particularly relates to a power tracking-based electric automobile hybrid power supply control method.
Background
Compared with the traditional vehicle, the electric vehicle has the characteristics of energy conservation and environmental protection, so that the electric vehicle becomes the inevitable trend of the development of the automobile industry. The energy supply of an electric vehicle is primarily an on-board battery. However, the service life of the vehicle-mounted battery is limited, so that the endurance mileage of the electric vehicle is short, the cost is too high, and the development pace of the electric vehicle industry is severely limited.
In recent years, the super capacitor can store a large amount of charges, so that the characteristic of high charging and discharging speed is rapidly developed, a high enough peak current can be provided when the electric automobile needs high power, and feedback energy can be absorbed during braking. The super capacitor is used as an auxiliary power supply of the storage battery, and the requirement of the electric automobile on high power can be made up. The combination of the storage battery and the super capacitor is used as the power supply of the electric automobile, so that the driving range of the electric automobile is guaranteed, the automobile has good acceleration and braking performance, peak clipping and valley filling of the super capacitor on the storage battery are realized, the service life of the lithium battery is prolonged, and the power performance of the electric automobile is improved.
The system structure of the existing hybrid power supply of the electric vehicle is shown in fig. 1, and comprises a storage battery, a super capacitor, a direct current bus and a power divider, wherein the power divider comprises a first DC/DC converter controlled by an energy management system. The storage battery is directly connected to the first end of the direct-current bus, the super capacitor is connected with the bidirectional first DC/DC converter to form a super capacitor power supply circuit, and the super capacitor power supply circuit is connected to the first end of the direct-current bus; the second end of the direct current bus is connected with a driving motor of the electric automobile.
When the electric automobile driving motor combined by the storage battery and the super capacitor is braked, the motor operates in a generator state, generated feedback energy can enable the storage battery to be impacted by larger current, the service life of the storage battery is influenced, the electric automobile can operate more efficiently for reasonably controlling the power output of the storage battery and the super capacitor, and how to reasonably control the energy supply of the storage battery and the super capacitor becomes a main problem of control of a composite power supply system.
In order to reasonably control the power output of the storage battery and the super capacitor and enable the electric automobile to run more efficiently, how to reasonably control the energy supply of the storage battery and the super capacitor becomes a main problem of the control of the composite power supply system.
Disclosure of Invention
The present invention is directed to solving the technical problems of the background art. Therefore, the invention provides a power tracking-based electric vehicle hybrid power supply control method; the method is used for coordinately controlling the output of the energy of the storage battery and the super capacitor aiming at the change of the required power of the electric automobile and recovering the energy of the super capacitor during braking, and can realize the reasonable distribution of the power between the storage battery and the super capacitor in the composite power supply.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a power tracking-based electric vehicle hybrid power supply control method is characterized in that an adopted electric vehicle hybrid power supply comprises a storage battery, a super capacitor, a direct current bus and a power divider, wherein the power divider comprises a first DC/DC converter controlled by an energy management system; the storage battery is connected to the first end of the direct-current bus, the super capacitor is connected with the bidirectional first DC/DC converter to form a super capacitor power supply circuit, and the super capacitor power supply circuit is connected to the first end of the direct-current bus; the second end of the direct current bus is connected to a driving motor of the electric automobile; the method comprises the following steps:
s1: energy consumption resistor R is connected in parallel at two ends of the super capacitor2A double-ring controlled unidirectional second DC/DC converter is connected between the storage battery and the first end of the direct current bus, wherein a super capacitor is equivalent to a capacitor in series connection in an equivalent circuit of the hybrid power systemModel of resistance, USCIs the open circuit voltage of the super capacitor, CSCEquivalent capacitance, R, of a supercapacitor1Is the equivalent series resistance of the super capacitor; u shapebattIs the open circuit voltage of the battery; inductor L1Switch tube S1And S2Forming a first DC/DC converter; inductor L2Switch tube S3And S4Forming a second DC/DC converter; s5-S8The H-bridge inverter and a driving motor system of the electric automobile are formed by the motor M; s2: calculating the required power P of the vehicleloadAnd a state of charge, SOC, of the supercapacitor, wherein,
Pload＝[(A+B·v+C·v2)+m·a]·v，
wherein v is vehicle speed, km/h; m is the total vehicle mass, kg; a is the vehicle acceleration, m/s2(ii) a A. B, C are all the results obtained by fitting;
wherein, when the voltage of the super capacitor reaches half of the full voltage, the super capacitor is regarded as the electricity exhaustion, and the effective working interval of the SOC is [0.25, 1 ]]In order to prevent the overdischarge and overcharge of the super capacitor, a certain margin is required to be reserved, and the charge state of the super capacitor is controlled to be 0.4 and 0.9]Therefore, the minimum value of the charge state of the super capacitor is 0.4, the maximum value of the charge state of the super capacitor is 0.9, USCIs the open circuit voltage, U, of the super capacitorSC-minIs the upper limit value of the voltage across the super capacitor, USC-maxThe lower limit value of the voltage at two ends of the super capacitor is obtained;
s3: judging the required power P of the vehicleloadWhether it is greater than zero; if Pload>0, continuously judging the required power P of the vehicleloadWhether it is greater than the maximum discharge power set value P of the storage batteryeqIf P isload>PeqJudging whether the SOC of the super capacitor is larger than the minimum SOC of the super capacitor, and if so, judging whether the SOC is larger than the minimum SOC of the super capacitor>0.4, the energy management system controls the storage battery and the super capacitor to jointly provide energy for the vehicle, namely Pbatt+Psc＝Pload(ii) a If SOC is less than or equal to 0.4, the energy management system controls the storage battery to provide driving energy for the vehicle independently, namely Pbatt＝PloadAnd P issc0; if Pload≤PeqThe energy management system controls the storage battery to provide driving energy for the vehicle alone, i.e. Pbatt＝PloadAnd P issc0, wherein PbattFor output of power from the accumulator, PscOutputting power for the super capacitor; if PloadIf the SOC is less than or equal to 0, judging whether the SOC of the super capacitor is less than the maximum SOC of the super capacitor, and if the SOC is less than or equal to 0<0.9, the energy management system controls the super capacitor to recover the braking energy of the vehicle, namely Pload＝Psc(ii) a If SOC is more than or equal to 0.9, the energy management system controls the energy consumption resistor R2Consuming braking energy, i.e. Pload＝PR2；
S4: and the control is finished.
Further, the second DC/DC converter converts the DC bus reference voltage U through the voltage loopdc-refAnd DC bus voltage UdcThe difference value of the reference current I and the reference current I is input into a first proportional integral regulator to obtain the reference current I of the storage batterybatt-refThen the reference current I of the storage battery is converted through a current loopbatt-refAnd a current flowing inductor L2Current of (I)L2After the difference is made, a control signal is generated through a second proportional-integral regulator, the second proportional-integral regulator inputs the obtained control signal into a first PWM pulse generator to obtain the output power P of the control storage batterybattThe PWM pulse signal of (1). By controlling the current through the inductor L2Current of (I)L2To control the current value I of the storage batterybattTherefore, the voltage of the direct current bus is stable, and the automobile can run stably. In the invention, the storage battery only provides energy for the automobile in the forward direction, and the braking energy of the automobile is not recovered in the reverse direction, so that the charging and discharging times of the storage battery and the impact of current on the storage battery are effectively reduced, and the purpose of prolonging the service life of the storage battery is achieved.
Further, the first DC/DC converter calculates the required power P of the vehicle according to the collected vehicle speed vloadAccording to the power demand of the vehiclePloadObtaining the current sum reference value I of the super capacitor and the storage battery by looking up a tablerefBy summing the currents of the supercapacitor and the accumulator to a reference value IrefAnd a current flowing inductor L2Current of (I)L2Making a difference to obtain an inductance L1Current reference value IL1-refThen, the inductor L is connected1Current reference value IL1-refAnd a current flowing inductor L1Current of (I)L1Making a difference to obtain an inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1By the difference of (a), and then the inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1The difference value is input into a third proportional-integral regulator to generate a control signal, and the proportional-integral regulator inputs the obtained control signal into a second PWM pulse generator to obtain the output power P of the control super capacitorscThe PWM pulse signal of (1). So that the actual current value of the super capacitor always tracks the current reference value of the super capacitor.
In the invention, an energy management system is adopted to collect the required power P of the vehicleloadAnd the SOC of the super capacitor judges the working mode of the vehicle, so that the power distribution of the hybrid power supply of the electric vehicle is controlled, the storage battery and the super capacitor can make quick response to the power demand in the change process of the working mode, and the feedback energy of the system is consumed by the parallel energy consumption resistor when the charging amount reaches the upper limit in order to avoid the damage of the super capacitor due to overcharging.
The invention has the beneficial effects that: the invention provides a power tracking-based electric vehicle hybrid power supply control method which can coordinate and control the output of energy of a storage battery and a super capacitor according to the change of the required power of an electric vehicle and recover the energy of the super capacitor during braking, can realize reasonable distribution of power between the storage battery and the super capacitor in a composite power supply, can meet the requirements of the electric vehicle on different powers at different moments, and can accelerate the response speed of the vehicle when the high power is required; when the storage battery supplies power independently, the voltage of the direct current bus is basically stable, and the requirement on dynamic stability during the stable running of the electric automobile can be met; compared with the storage battery which is independently powered, the super capacitor is added, so that the effect of 'peak clipping and valley filling' can be achieved for the storage battery; the second DC/DC converter connected with the storage battery is unidirectional, so that the storage battery is ensured to provide energy for the automobile only in the forward direction, and the braking energy of the automobile is not recovered in the reverse direction, the charging and discharging times of the storage battery and the impact of current on the storage battery are reduced, and the purpose of prolonging the service life of the storage battery is achieved.
Drawings
Fig. 1 is a schematic system structure diagram of a background art electric hybrid power supply;
FIG. 2 is a schematic diagram of a system configuration of the electric hybrid power supply of the present invention;
FIG. 3 is a system equivalent circuit diagram of the electric hybrid power supply in the present invention;
FIG. 4 is a control flow diagram of a hybrid power system in accordance with the present invention;
fig. 5 is a control block diagram of a first DC/DC converter according to the present invention;
fig. 6 is a control block diagram of a second DC/DC converter according to the present invention;
FIG. 7 is a graph of the voltage waveform of the DC bus voltage according to the present invention as the vehicle is operating;
FIG. 8 is a current waveform of a current waveform diagram of a battery according to the present invention in a case where a vehicle running state is constantly changed;
FIG. 9 is a current waveform of a current waveform diagram of a super capacitor according to the present invention under varying vehicle operating conditions;
FIG. 10 is a state of charge diagram for a supercapacitor in accordance with the present invention;
fig. 11 is a state of charge change diagram of a battery according to the present invention.
Detailed Description
Referring to fig. 1 to 11, a power tracking based hybrid power control method for an electric vehicle according to the present invention will be described in detail.
A power tracking-based electric vehicle hybrid power supply control method is characterized in that an adopted electric vehicle hybrid power supply comprises a storage battery, a super capacitor, a direct current bus and a power divider, wherein the power divider comprises a first DC/DC converter controlled by an energy management system; the storage battery is connected to the first end of the direct-current bus, the super capacitor is connected with the bidirectional first DC/DC converter to form a super capacitor power supply circuit, and the super capacitor power supply circuit is connected to the first end of the direct-current bus; the second end of the direct current bus is connected to a driving motor of the electric automobile; the method comprises the following steps:
s1: energy consumption resistor R is connected in parallel at two ends of the super capacitor2A double-ring controlled unidirectional second DC/DC converter is connected between the storage battery and the first end of the DC bus, as shown in fig. 2, wherein the super capacitor is equivalent to a model of a capacitor series resistor, U, in the equivalent circuit of the hybrid power systemSCIs the open circuit voltage of the super capacitor, CSCEquivalent capacitance, R, of a supercapacitor1Is the equivalent series resistance of the super capacitor; u shapebattIs the open circuit voltage of the battery; inductor L1Switch tube S1And S2Forming a first DC/DC converter; inductor L2Switch tube S3And S4Forming a second DC/DC converter; s5-S8And a motor M form an H-bridge inverter and a driving motor system of the electric automobile, which is specifically shown in FIG. 3;
s2: calculating the required power P of the vehicleloadAnd a state of charge, SOC, of the supercapacitor, wherein,
Pload＝[(A+B·v+C·v2)+m·a]·v，
wherein v is vehicle speed, km/h; m is the total vehicle mass, kg; a is the vehicle acceleration, m/s2(ii) a A. B, C are all the results obtained by fitting;
wherein, when the voltage of the super capacitor reaches half of the full voltage, the super capacitor is regarded as the electricity exhaustion, and the effective working interval of the SOC is [0.25, 1 ]]In order to prevent the overdischarge and overcharge of the super capacitor, a certain margin is required to be reserved, and the charge state of the super capacitor is controlled to be 0.4 and 0.9]Therefore, the minimum value of the charge state of the super capacitor is 0.4, the maximum value of the charge state of the super capacitor is 0.9, USCIs the open circuit voltage, U, of the super capacitorSC-minIs the upper limit value of the voltage across the super capacitor, USC-maxThe lower limit value of the voltage at two ends of the super capacitor is obtained;
s3: judging the required power P of the vehicleloadWhether it is greater than zero; if Pload>0, continuously judging the required power P of the vehicleloadWhether it is greater than the maximum discharge power set value P of the storage batteryeqIf P isload>PeqJudging whether the SOC of the super capacitor is larger than the minimum SOC of the super capacitor, and if so, judging whether the SOC is larger than the minimum SOC of the super capacitor>0.4, the energy management system controls the storage battery and the super capacitor to jointly provide energy for the vehicle, namely Pbatt+Psc＝Pload(ii) a If SOC is less than or equal to 0.4, the energy management system controls the storage battery to provide driving energy for the vehicle independently, namely Pbatt＝PloadAnd P issc0; if Pload≤PeqThe energy management system controls the storage battery to provide driving energy for the vehicle alone, i.e. Pbatt＝PloadAnd P issc0, wherein PbattFor output of power from the accumulator, PscOutputting power for the super capacitor; if PloadIf the SOC is less than or equal to 0, judging whether the SOC of the super capacitor is less than the maximum SOC of the super capacitor, and if the SOC is less than or equal to 0<0.9, the energy management system controls the super capacitor to recover the braking energy of the vehicle, namely Pload＝Psc(ii) a If SOC is more than or equal to 0.9, the energy management system controls the energy consumption resistor R2Consuming braking energy, i.e. Pload＝PR2As shown in fig. 4 in detail; s4: and the control is finished.
Further, the invention relates to a power tracking-based electric steamIn the concrete implementation mode of the vehicle hybrid power supply control method, the second DC/DC converter converts the direct current bus reference voltage U through the voltage loopdc-refAnd DC bus voltage UdcThe difference value of the reference current I and the reference current I is input into a first proportional integral regulator to obtain the reference current I of the storage batterybatt-refThen the reference current I of the storage battery is converted through a current loopbatt-refAnd a current flowing inductor L2Current of (I)L2After the difference is made, a control signal is generated through a second proportional-integral regulator, the second proportional-integral regulator inputs the obtained control signal into a first PWM pulse generator to obtain the output power P of the control storage batterybattThe PWM pulse signal is specifically the control process shown in fig. 5, which is the dual-loop control shown in fig. 2, and the energy output of the battery is controlled through the conventional dual-loop control, so as to ensure the dynamic stability of the vehicle during the stable operation. By controlling the current through the inductor L2Current of (I)L2To control the current value I of the storage batterybattTherefore, the voltage of the direct current bus is stable, and the automobile can run stably. In the invention, the storage battery only provides energy for the automobile in the forward direction, and the braking energy of the automobile is not recovered in the reverse direction, so that the charging and discharging times of the storage battery and the impact of current on the storage battery are reduced, and the purpose of prolonging the service life of the storage battery is achieved.
Further, as a specific embodiment of the power tracking-based hybrid power control method for the electric vehicle according to the present invention, the first DC/DC converter calculates the required power P of the vehicle according to the collected vehicle speed vloadAccording to the power demand P of the vehicleloadObtaining the current sum reference value I of the super capacitor and the storage battery by looking up a tablerefBy summing the currents of the supercapacitor and the accumulator to a reference value IrefAnd a current flowing inductor L2Current of (I)L2Making a difference to obtain an inductance L1Current reference value IL1-refThen, the inductor L is connected1Current reference value IL1-refAnd a current flowing inductor L1Current of (I)L1Making a difference to obtain an inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1By the difference of (a), and then the inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1The difference value is input into a third proportional-integral regulator to generate a control signal, and the proportional-integral regulator inputs the obtained control signal into a second PWM pulse generator to obtain the output power P of the control super capacitorscThe PWM pulse signal of (1). The actual current value of the super capacitor always tracks the current reference value of the super capacitor, specifically as shown in fig. 6, and the energy output of the super capacitor is controlled through power tracking, so that the super capacitor provides energy for the vehicle running when high power is required.
In the invention, an energy management system is adopted to collect the required power P of the vehicleloadAnd the SOC of the super capacitor judges the working mode of the vehicle, so that the power distribution of the hybrid power supply of the electric vehicle is controlled, the storage battery and the super capacitor can make quick response to the power demand in the change process of the working mode, and the feedback energy of the system is consumed by the parallel energy consumption resistor when the charging amount reaches the upper limit in order to avoid the damage of the super capacitor due to overcharging.
From fig. 7, when the storage battery supplies power independently, the voltage value fluctuation is small and is basically stabilized at 300V, at the moment, the operation of the electric automobile is stable, when the automobile enters a high-power operation state such as acceleration or climbing, the super capacitor immediately participates in power supply to provide instantaneous large-current response for the operation of the automobile, the current change amplitude is large, and at the moment, the voltage of the direct-current bus obviously rises.
The current waveform of the super capacitor can accurately follow the current reference value of the super capacitor, and when a vehicle needs high power, the super capacitor supplies power, so that the characteristic of high power density of the super capacitor is fully exerted, the super capacitor changes along with the change of the running state in a short time, and the power compensation can be performed in time. The current flowing through the storage battery is obviously reduced, and the impact of the storage battery is effectively reduced.
As can be seen from fig. 10, the super capacitor has a high power density, a high change speed of the state of charge, a large reduction range of the terminal voltage along with the reduction of energy, and a fast charging and discharging process, and can meet the requirement of the hybrid power supply for rapidity.
As can be seen from fig. 11, the energy density of the storage battery is high, and the auxiliary power supply-super capacitor responds to a high power demand, so that the terminal voltage change of the storage battery is small, and the charge state of the storage battery is reduced gently.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A power tracking-based electric vehicle hybrid power supply control method is characterized in that an adopted electric vehicle hybrid power supply comprises a storage battery, a super capacitor, a direct current bus and a power divider, wherein the power divider comprises a first DC/DC converter controlled by an energy management system; the storage battery is connected to the first end of the direct-current bus, the super capacitor is connected with the bidirectional first DC/DC converter to form a super capacitor power supply circuit, and the super capacitor power supply circuit is connected to the first end of the direct-current bus; the second end of the direct current bus is connected to a driving motor of the electric automobile; the method is characterized by comprising the following steps:
s1: energy consumption resistor R is connected in parallel at two ends of the super capacitor2A double-ring controlled unidirectional second DC/DC converter is connected between the storage battery and the first end of the direct current bus, wherein a super capacitor is equivalent to a model of a capacitor series resistor in an equivalent circuit of the hybrid power system, USCIs the open circuit voltage of the super capacitor, CSCEquivalent capacitance, R, of a supercapacitor1Is the equivalent series resistance of the super capacitor; u shapebattIs the open circuit voltage of the battery; inductor L1Switch tube S1And S2Forming a first DC/DC converter; inductor L2Switch tube S3And S4Forming a second DC/DC converter; s5-S8The H-bridge inverter and a driving motor system of the electric automobile are formed by the motor M;
s2: calculating the required power P of the vehicleloadAnd superThe state of charge of the capacitor, SOC, wherein,
Pload＝[(A+B·v+C·v2)+m·a]·v，
wherein v is vehicle speed, km/h; m is the total vehicle mass, kg; a is the vehicle acceleration, m/s2(ii) a A. B, C are all the results obtained by fitting;
wherein, when the voltage of the super capacitor reaches half of the full voltage, the super capacitor is regarded as the electricity exhaustion, and the effective working interval of the SOC is [0.25, 1 ]]In order to prevent the overdischarge and overcharge of the super capacitor, a certain margin is required to be reserved, and the charge state of the super capacitor is controlled to be 0.4 and 0.9]Therefore, the minimum value of the charge state of the super capacitor is 0.4, the maximum value of the charge state of the super capacitor is 0.9, USCIs the open circuit voltage, U, of the super capacitorSC-minIs the upper limit value of the voltage across the super capacitor, USC-maxThe lower limit value of the voltage at two ends of the super capacitor is obtained;
s3: judging the required power P of the vehicleloadWhether it is greater than zero; if PloadIf the power is more than 0, the power P required by the vehicle is continuously judgedloadWhether it is greater than the maximum discharge power set value P of the storage batteryeqIf P isload＞PeqJudging whether the SOC of the super capacitor is larger than the minimum SOC of the super capacitor, if the SOC is larger than 0.4, controlling the storage battery and the super capacitor to supply energy for the vehicle together by the energy management system, namely Pbatt+Psc＝Pload(ii) a If SOC is less than or equal to 0.4, the energy management system controls the storage battery to provide driving energy for the vehicle independently, namely Pbatt＝PloadAnd P issc0; if Pload≤PeqThe energy management system controls the storage battery to provide driving energy for the vehicle alone, i.e. Pbatt＝PloadAnd P issc0, wherein PbattFor output of power from the accumulator, PscOutputting power for the super capacitor; if PloadIf the SOC is less than or equal to 0, judging whether the SOC of the super capacitor is less than the super powerThe maximum value of the capacitive charge state, if the SOC is less than 0.9, the energy management system controls the super capacitor to recover the braking energy of the vehicle, namely Pload＝Psc(ii) a If SOC is more than or equal to 0.9, the energy management system controls the energy consumption resistor R2Consuming braking energy, i.e. Pload＝PR2；
S4: and the control is finished.
2. The power tracking-based electric vehicle hybrid power supply control method according to claim 1, characterized in that: the second DC/DC converter converts the DC bus reference voltage U through the voltage loopdc-refAnd DC bus voltage UdcThe difference value of the reference current I and the reference current I is input into a first proportional integral regulator to obtain the reference current I of the storage batterybatt-refThen the reference current I of the storage battery is converted through a current loopbatt-refAnd a current flowing inductor L2Current of (I)L2After the difference is made, a control signal is generated through a second proportional-integral regulator, the second proportional-integral regulator inputs the obtained control signal into a first PWM pulse generator to obtain the output power P of the control storage batterybattThe PWM pulse signal of (1).
3. The power tracking-based electric vehicle hybrid power supply control method according to claim 2, characterized in that: the first DC/DC converter calculates the required power P of the vehicle according to the collected vehicle speed vloadAccording to the power demand P of the vehicleloadObtaining the current sum reference value I of the super capacitor and the storage battery by looking up a tablerefBy summing the currents of the supercapacitor and the accumulator to a reference value IrefAnd a current flowing inductor L2Current of (I)L2Making a difference to obtain an inductance L1Current reference value IL1-refThen, the inductor L is connected1Current reference value IL1-refAnd a current flowing inductor L1Current of (I)L1Making a difference to obtain an inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1By the difference of (a), and then the inductance L1Current reference value IL1-refAnd an inductance L1Actual current value IL1Difference of (2)The value is input into a third proportional-integral regulator to generate a control signal, the proportional-integral regulator inputs the obtained control signal into a second PWM pulse generator to obtain the output power P of the control super capacitorscThe PWM pulse signal of (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911246857.0A CN110884364A (en) | 2019-12-06 | 2019-12-06 | Power tracking-based electric vehicle hybrid power supply control method |
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| CN115071450A (en) * | 2022-08-03 | 2022-09-20 | 盐城工学院 | Closed-loop control parallel composite power supply braking energy recovery control system and working method thereof |
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| CN112477690A (en) * | 2020-11-13 | 2021-03-12 | 太原理工大学 | Energy dynamic distribution and optimization control device for new energy automobile driving system |
| CN112590569A (en) * | 2020-12-17 | 2021-04-02 | 武汉格罗夫氢能汽车有限公司 | Energy management method and system for parallel fuel cell and super capacitor |
| CN112590569B (en) * | 2020-12-17 | 2024-01-05 | 武汉格罗夫氢能汽车有限公司 | Energy management method and system for parallel fuel cell and super capacitor |
| CN114475352A (en) * | 2022-03-18 | 2022-05-13 | 珠海极海半导体有限公司 | Battery supply circuit, battery management system, MPU and automobile power system |
| CN114954541A (en) * | 2022-04-29 | 2022-08-30 | 中车工业研究院有限公司 | Cooperative method and device for power distribution and tracking speed of vehicle |
| CN114954541B (en) * | 2022-04-29 | 2023-08-18 | 中车工业研究院有限公司 | Cooperative method and device for power distribution and tracking speed of vehicle |
| CN115071450A (en) * | 2022-08-03 | 2022-09-20 | 盐城工学院 | Closed-loop control parallel composite power supply braking energy recovery control system and working method thereof |
| CN116674425A (en) * | 2023-06-07 | 2023-09-01 | 湖南文理学院 | Coordinated control method and system for power battery pack based on total amount consistency |
| CN116674425B (en) * | 2023-06-07 | 2023-12-01 | 湖南文理学院 | Coordinated control method and system for power battery pack based on total amount consistency |
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