CN113013971B - Voltage stabilization control method, device, hybrid power system and storage medium - Google Patents
Voltage stabilization control method, device, hybrid power system and storage medium Download PDFInfo
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- CN113013971B CN113013971B CN202110203532.5A CN202110203532A CN113013971B CN 113013971 B CN113013971 B CN 113013971B CN 202110203532 A CN202110203532 A CN 202110203532A CN 113013971 B CN113013971 B CN 113013971B
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- 238000000034 method Methods 0.000 title claims abstract description 81
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 128
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 75
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- 239000003990 capacitor Substances 0.000 claims abstract description 39
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a voltage stabilizing control method, a voltage stabilizing control device, a hybrid power system and a storage medium. The power supply system is used for a hybrid power system, and the hybrid power system comprises a motor, a first circuit, a DCDC converter and a second circuit, wherein the second circuit is connected with a load. The voltage stabilizing control method comprises the following steps: controlling the DCDC converter to operate in a buck mode; acquiring the power utilization power change state of a load; and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at the first voltage. The voltage stabilizing control method, the voltage stabilizing control device, the hybrid power system and the storage medium can reduce the capacity of the capacitor device of the first circuit of the hybrid power system, reduce the pre-charging time, reduce the capacity and the installation space, and further reduce the cost; the overvoltage or undervoltage of the first circuit can be avoided, and the stability of the hybrid power system can be improved.
Description
Technical Field
The invention belongs to the technical field of hybrid electric vehicle control, and particularly relates to a voltage stabilizing control method, a device, a hybrid electric system and a storage medium.
Background
With the increasingly strict requirements of the nation on the fuel consumption and the emission of the automobile and the improvement of the requirements of drivers and passengers on the economy of the automobile and the comfort of driving experience, the hybrid electric vehicle is increasingly favored by automobile manufacturers and consumers, and becomes an increasingly development trend of automobile technology.
As a branch of the hybrid system, the 48V hybrid system is increasingly valued by vehicle enterprises and is widely used because of its advantages such as high cost performance and easy integration. Referring to fig. 1, fig. 1 is a schematic topology diagram of one of the 48V hybrid systems in the prior art, and as can be seen from fig. 1, the hybrid system includes a motor 100, a first circuit 200, a DCDC converter 300, a second circuit 400, and a control module 500. Wherein the first circuit 200 comprises a 48V lithium-ion battery. The 48V hybrid system eliminates the traditional generator and the DCDC converter 300 transfers 48V side energy to the 12V side to provide continuous power to the load of the 12V electrical network.
However, 48V lithium ion batteries cannot close the battery relay under ultra-low temperature conditions (e.g., below-35 degrees Celsius) or based on battery protection considerations. When the 48V lithium ion battery cannot close the battery relay, the 48V hybrid system cannot keep the network voltage stable due to the small capacitance (for example, less than 5 mF) at the 48V circuit side, and at this time, continuous electric energy cannot be provided for the electric load at the 12V circuit side. At this time, in order to continuously supply the electric power to the electric load, only the stored energy of the 12V battery can be relied on. However, since the 12V battery has limited stored energy, it is difficult to ensure that the vehicle can normally operate.
To solve this problem, in the prior art, a super capacitor device with a larger capacity is generally connected in parallel to the 48V circuit side. Referring to fig. 2, fig. 2 is a schematic diagram of a topology of another 48V hybrid system according to the prior art. Since the super capacitor device 210 has good charge and discharge capability at ultra-low temperature, the voltage of the 48V circuit side can be stabilized in the case that the 48V battery relay is turned off, so that the vehicle can be operated normally. Further, since the voltage change rate du=dq/C of the capacitive device 210, the voltage change rate is smaller when the capacity of the capacitive device 210 is larger under the same condition. The larger the capacity of the super capacitor device 210 connected in parallel, the more functions the 48V hybrid power system can perform, and when the capacity of the super capacitor device 210 is large enough, all functions and performances of the 48V system can be realized by the same way as the 48V lithium ion battery, however, the larger the capacity of the capacitor device, the higher the pre-charging time, the higher the cost, the larger the volume and the more difficult the installation. Reducing the capacitance of the capacitor device reduces the capacitance volume, installation space and precharge time, but increases the voltage ripple on the 48V circuit side, possibly even resulting in over-voltage or under-voltage. The 48V circuit side overvoltage risks damaging electrical components, and the undervoltage, while not damaging the components, can affect the normal operation of the vehicle.
Therefore, how to provide a voltage stabilizing control method for a hybrid power system is becoming one of the technical problems to be solved by those skilled in the art.
It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a voltage stabilizing control method, a device, a hybrid power system and a storage medium, so that the capacity of a super capacitor of the hybrid power system is reduced, the capacity and installation space are reduced, the cost is reduced, and a vehicle can normally run.
In order to achieve the above purpose, the present invention is realized by the following technical scheme: the voltage stabilizing control method is used for a hybrid power system, and the hybrid power system comprises a motor, a first circuit, a DCDC converter and a second circuit, wherein the motor is electrically connected with the first circuit, the first circuit is electrically connected with the second circuit through the DCDC converter, and the second circuit comprises a load;
The voltage stabilizing control method comprises the following steps:
S1: controlling the DCDC converter to operate in a buck mode, and converting the electric energy of the first circuit into the second circuit;
S2: acquiring the power utilization power change state of the load;
S3: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage.
Optionally, the first circuit includes a first battery unit and a capacitor device connected in parallel with the first battery unit, and before step S1, the method further includes the following steps:
Pre-charging the first circuit and/or the capacitive device when the hybrid system is started or when the first circuit is under-voltage;
if it is determined that the voltage of the first circuit reaches the first voltage, step S1 is performed.
Optionally, in step S2, the method for acquiring the power consumption change state of the load includes:
and obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the basic power of the load.
Optionally, the method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the base power of the load includes:
And obtaining a difference value between the current power of the DCDC converter and the basic power of the load, and taking the difference value as the reduction amount of the electric power.
Optionally, the method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the base power of the load includes:
acquiring a difference value between the current power of the DCDC converter and the basic power of the load as a first load throwing power;
acquiring working condition parameters of the hybrid power system, acquiring preset load throwing power of the second circuit according to the working condition parameters and a preset load throwing strategy, and taking the preset load throwing power as second load throwing power;
and taking the minimum value of the first throwing load power and the second throwing load power as the reduction amount of the electric power.
Optionally, the method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the base power of the load includes: and controlling the on-off state of the load through load management and/or acquiring the reduction amount of the electric power in real time.
Optionally, in step S3, the method for controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power consumption change state and a preset voltage stabilizing control strategy includes:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
Optionally, the controlling the output current limit value of the DCDC converter in real time according to the first preset strategy includes obtaining the output current limit value by:
idcdc,max＝idcdc,act+di
Wherein i dcdc,max is the output current limit value of the DCDC converter, i dcdc,act is the real-time current value of the DCDC converter, and d i is the preset variation current of the DCDC converter.
Optionally, the preset variation current is calibrated according to the operation condition of the hybrid power system and the performance parameter of the DCDC converter.
Optionally, the controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy includes obtaining the target voltage by:
And obtaining the target voltage of the motor according to the preset corresponding relation between the reduction amount of the power consumption and the output voltage of the motor.
In order to achieve the above object, the present invention also provides a voltage regulation control device for a hybrid system including a motor, a first circuit, a DCDC converter, and a second circuit, wherein the motor is electrically connected to the first circuit, the first circuit is electrically connected to the second circuit through the DCDC converter, and the second circuit includes a load;
the voltage stabilizing control device comprises:
an operation control unit configured to control the DCDC converter to operate in a buck mode, converting electric energy of the first circuit to the second circuit;
A load management unit configured to acquire a power usage change state of the load;
And a voltage stabilizing control unit configured to control an output current limit value of the DCDC converter and a target voltage of the motor according to the power consumption change state and a preset voltage stabilizing control strategy so that the first circuit operates at a first voltage.
Optionally, the method for controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power variation state and the preset voltage stabilizing control strategy so as to make the first circuit operate at the first voltage includes:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
In order to achieve the above object, the present invention also provides a hybrid system including: the voltage stabilizing control device comprises a motor, a first circuit, a DCDC converter, a second circuit and any one of the voltage stabilizing control devices, wherein the motor is electrically connected with the first circuit, the first circuit is electrically connected with the second circuit through the DCDC converter, and the second circuit comprises a load; the voltage stabilizing control device is electrically connected with the motor, the DCDC converter, the first circuit and the second circuit;
The voltage stabilization control apparatus is configured to: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage.
In order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed, implement the steps of the voltage regulation control method of any one of the above.
Compared with the prior art, the voltage stabilizing control method, the device, the hybrid power system and the storage medium provided by the invention have the following beneficial effects:
The voltage stabilizing control method is used for a hybrid power system, wherein the hybrid power system comprises a motor, a first circuit, a DCDC converter and a second circuit, the motor is electrically connected with the first circuit, the first circuit is electrically connected with the second circuit through the DCDC converter, and the second circuit comprises a load; the voltage stabilizing control method comprises the following steps: s1: controlling the DCDC converter to operate in a buck mode, and converting the electric energy of the first circuit into the second circuit; s2: acquiring the power utilization power change state of the load; s3: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage. So configured, the voltage stabilizing control method provided by the invention not only can reduce the capacity of the capacitor device of the first circuit of the hybrid power system, but also can reduce the pre-charging time, the capacity and the installation space, thereby reducing the cost; meanwhile, overvoltage or undervoltage of the first circuit can be avoided, voltage change of the first circuit when a load is started is reduced, larger capacitance voltage change when the load is thrown can be tolerated, and stability of the hybrid power system can be improved.
Drawings
FIG. 1 is a schematic diagram of a 48V hybrid powertrain of the prior art;
FIG. 2 is a schematic diagram of the topology of another 48V hybrid powertrain of the prior art;
FIG. 3 is a flow chart of a voltage stabilizing control method according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a capacitive relay control method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a voltage stabilizing control device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a 48V hybrid powertrain according to an embodiment of the present invention;
wherein reference numerals are as follows:
100-motor, 110-motor circuit unit, 120-motor control unit, 200-first circuit, 210-capacitor device, 220-first battery unit, 230-circuit management unit, 300-DCDC converter, 310-DCDC circuit unit, 320-DCDC control unit, 400-second circuit, 410-second battery unit, 420-load, 500-control module;
610-voltage stabilizing control device, 611-operation control unit, 612-load management unit, 613-voltage stabilizing control unit.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the voltage stabilizing control method, device, hybrid system and storage medium according to the present invention will be described in further detail with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. It should be understood that the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. Specific design features of the invention disclosed herein, including for example, specific dimensions, orientations, positions, and configurations, will be determined in part by the specific intended application and use environment. In the embodiments described below, the same reference numerals are used in common between the drawings to denote the same parts or parts having the same functions, and the repetitive description thereof may be omitted. In this specification, like reference numerals and letters are used to designate like items, and thus once an item is defined in one drawing, no further discussion thereof is necessary in subsequent drawings.
These terms so used may be substituted where appropriate. Similarly, if a method described herein comprises a series of steps, and the order of the steps presented herein is not necessarily the only order in which the steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.
Before describing the voltage stabilizing control method, device, hybrid power system and storage medium, the basic principle of the invention will be briefly described.
From the above analysis, it can be seen that: for a hybrid system, referring to fig. 2, the greater the amount of power flowing into the capacitor under equal conditions, the greater the voltage change rate of the first circuit; under the same condition, when the capacity of the capacitor device is larger, the voltage fluctuation rate of the first circuit is smaller, but the larger the capacity of the capacitor device is, the higher the pre-charge time, the higher the cost and the larger the volume are, and the more difficult the installation is. Reducing the capacitance of the capacitor device reduces the capacitance volume, installation space and precharge time, but increases the voltage ripple on the 48V circuit side, possibly even resulting in over-voltage or under-voltage. The inventor of the present invention has conducted intensive studies and extensive practices to find that the under-voltage and over-voltage of the 48V network, which increases the capacitance, mainly comes from the change of the electric energy required by the electric load on the side of the second circuit 400, the larger the power change of the DCDC converter 300, the larger the voltage fluctuation on the side of the first circuit 200, and the over-voltage or under-voltage of the 48V network may occur when the converted power change of the DCDC converter 300 exceeds a certain limit. Accordingly, when the DCDC converter 300 operates in the buck mode, overvoltage and undervoltage due to a change in DCDC converted power can be prevented by controlling the target voltage and current limit values of the DCDC converter 300. Thus, only a capacitive device with a smaller capacity is needed to enable the first circuit 200 to operate at the first voltage, avoiding an overvoltage or undervoltage.
Based on this, one of the embodiments of the present invention provides a voltage stabilization control method for a hybrid system. Specifically, referring to fig. 3 and fig. 6, fig. 3 is a schematic flow chart of a voltage stabilizing control method according to an embodiment of the present invention, and fig. 6 is a schematic topological structure diagram of a 48V hybrid power system according to an embodiment of the present invention. As can be seen from fig. 6, the hybrid system includes a motor 100, a first circuit 200, a DCDC converter 300, and a second circuit 400, wherein the motor 100 is electrically connected to the first circuit 200, the first circuit 200 is electrically connected to the second circuit 400 through the DCDC converter 300, and the second circuit 400 includes a load 420. In particular, for ease of understanding and description, the present invention is described by way of example with the most widely used 48V hybrid system for a hybrid vehicle applied to an engine management system EMS (Engine Management System). In particular, as will be appreciated by those skilled in the art, the first voltage of the first circuit 200 is an operating voltage of the motor 100 voltage mode, typically a range interval, depending on the operating range and control strategy of the motor 100 voltage mode. For example, the first voltage is [24V,54V ], typically 48V. Similarly, the second voltage of the second circuit 400 is also a range interval, which depends on the buck mode voltage range of the DCDC converter 300, such as the first voltage of [24V,54V ], typically 12V. For convenience of description and understanding, the first circuit 200 side will be referred to as a 48V circuit side; the second circuit 400 is referred to as a 12V circuit side. Further, the voltage stabilizing control method provided by the invention is not limited to the topological structure of the 48V hybrid power system shown in fig. 6, and can be expanded to be used for different hybrid power topological structures; still further, the voltage stabilizing control method provided by the invention is not only limited to a 48V and 12V hybrid structure, but also can be used for a high-voltage hybrid power system and other multi-voltage systems; furthermore, the voltage stabilizing control method provided by the scheme can be expanded to other hybrid power controllers, such as the whole vehicle controller VCU (Vehicle control unit), the automatic gearbox controller TCU (Transmission Control Unit) and the like. The voltage stabilizing control method provided by the invention aims at the situation that the 48V circuit side (including but not limited to 48V) cannot work normally, including the fault of the 48V battery or the incapability of the 48V battery to work normally in an extreme environment (such as ultralow temperature and temperature lower than-35 ℃).
Specifically, referring to fig. 3, as can be seen from fig. 3, the voltage stabilizing control method provided in this embodiment includes:
S1: the DCDC converter 300 is controlled to operate in buck mode to convert the electrical energy of the first circuit 200 to the second circuit 400.
S2: the power consumption change state of the load 420 is acquired.
S3: according to the power variation state and a preset voltage stabilizing control strategy, the output current limit value of the DCDC converter 300 and the target voltage of the motor 100 are controlled so that the first circuit 200 operates at a first voltage.
So configured, the voltage stabilizing control method provided by the invention not only can reduce the capacity of the capacitor device of the first circuit 200 of the hybrid power system, but also can reduce the pre-charging time, the capacity and the installation space without increasing any hardware resources, thereby reducing the cost; meanwhile, the first circuit 200 can be prevented from overvoltage or undervoltage, the voltage variation of the first circuit when the load 420 is started is reduced, the larger capacitance voltage variation during load throwing can be tolerated, and the stability of the hybrid power system can be improved.
Preferably, in one exemplary embodiment, the first circuit includes a first battery cell 220 and a capacitive device 210 connected in parallel therewith. Preferably, the first battery unit may be a 48V lithium ion battery. Before step S1, the method further comprises the following steps: pre-charging the first circuit and/or the capacitive device when the hybrid system is started or when the first circuit is under-voltage; if it is determined that the voltage of the first circuit reaches the first voltage, step S1 is performed. Specifically, in some embodiments, after the driver starts the engine by using a key, the hybrid system controller controls the DCDC converter 300 to operate in the precharge mode, pre-charges the capacitor in the motor 100 to the actual voltage of the capacitor, and after the capacitor relay is closed, the DCDC converter 300 enters the boost mode to continue charging the capacitor 210, so that the voltage of the capacitor 210 reaches the voltage at which the motor 100 can operate in the voltage mode, and then controls the motor 100 to enter the voltage (voltage stabilizing) mode, and controls the DCDC converter 300 to enter the buck mode, i.e., the electric energy of the motor 100 is converted to the second circuit 400 (12V circuit side). In other embodiments, according to the description of the basic principles of the present invention, since one of the purposes of the present invention is to avoid overvoltage of the motor 100, the capacitor 210, the first circuit 200 and/or the DCDC converter 300, when the power of the load 420 is high, the voltage of the first circuit 200 may be controlled to be at a low level, and at this time, there may be an under-voltage risk, so when under-voltage occurs, the DCDC converter 300 is controlled to enter a boost mode to precharge the first circuit 200.
Preferably, in one exemplary embodiment, in step S2, a method for acquiring a power change state of the load includes:
The reduction amount of the electric power is obtained based on the current power of the DCDC converter 300 and the base power of the load.
Specifically, in some embodiments, the method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter 300 and the base power of the load 420 includes: a difference between the current power of the DCDC converter 300 and the base power of the load 420 is obtained, and the difference is taken as a reduction amount of the electric power. The basic power is the power consumed by the 12V circuit side load when the driver does not actively start any load.
In some other embodiments, the method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter 300 and the base power of the load 420 includes:
the first step: the difference between the current power of the DCDC converter 300 and the base power of the load 420 is obtained as a first load rejection power.
And a second step of: and acquiring working condition parameters of the hybrid power system, acquiring preset load rejection power of the second circuit according to the working condition parameters and a preset load rejection strategy, and taking the preset load rejection power as second load rejection power.
And a third step of: and taking the minimum value of the first throwing load power and the second throwing load power as the reduction amount of the electric power.
It is understood that the load 420 includes, but is not limited to, electrical power components for air conditioning, dehumidification, and the like. Further, the method for acquiring the working condition parameters and the preset load rejection strategy is not limited. For example, in some embodiments, the preset load rejection power of the DCDC converter 300 is obtained by performing big data analysis, load control analysis, or load control strategy through real vehicle tests. The load control strategy aims at the condition that the whole vehicle can control the load.
In other embodiments, the accurate power change status is obtained in real time by the load management module. The method for obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the basic power of the load comprises the following steps: and controlling the on-off state of the load through load management and/or acquiring the reduction amount of the electric power in real time.
Preferably, in some embodiments, in step S3, the method for controlling the output current limit value of the DCDC converter 300 and the target voltage of the motor according to the power consumption change state and a preset voltage stabilizing control strategy includes:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
Preferably, in some embodiments, the controlling the output current limit of the DCDC converter in real time according to the first preset strategy includes obtaining the output current limit by:
idcdc,max＝idcdc,act+di
Where i dcdc,max is the output current limit value of the DCDC converter, i dcdc,act is the real-time current value of the DCDC converter 300, d i is the preset variable current of the DCDC converter 300, and preferably, in some embodiments, d i is the current that the DCDC converter 300 is allowed to vary every period (such as a CAN communication transmission period, which period may also be set according to the actual working condition) of the DCDC converter 300. Preferably, the preset variation current is calibrated according to the operation condition of the hybrid system and the performance parameter of the DCDC converter 300. In some embodiments, the output current limit of the DCDC converter 300 may also only consider its performance parameter, i.e. the minimum current limit rate of change of the DCDC converter 300 operation, in relation to the control accuracy of the DCDC converter 300. It should be understood that the foregoing description is merely a description of the preferred embodiment, and the present invention is not limited to the method for obtaining the preset variation current. So configured, the current limit calculated in this manner neither limits the power conversion of the DCDC converter 300 nor causes a sudden increase in power of the DCDC converter 300, thereby controlling the rate of increase of the 48V circuit side current, increasing the rate variation as little as possible, avoiding the risk of under-voltage caused by large voltage fluctuations to the first circuit 200.
Preferably, in some embodiments, the second circuit 400 further comprises a second battery cell 410. Preferably, the second battery cell 410 is a 12V lead acid battery. Specifically, when the power consumption increases, the second battery unit 410 can supply power to the load 420 to operate the first circuit 200 at a first voltage. It will be appreciated that the second battery unit 410 has a stronger discharging capability and a poorer charging capability, when the amount of power required by the load 420 increases (e.g. the load is turned on), the increased power may come from the DCDC converter 300 or the second battery unit 410, and the current limit of the DCDC converter 300 may be controlled to gradually increase the conversion power of the DCDC converter 300, thereby reducing the risk of the first circuit 200 having an under-voltage.
Preferably, in some embodiments, the method of controlling the target voltage of the motor 100 in real time according to the reduction amount of the electric power and the second preset strategy includes obtaining the target voltage by: and acquiring the target voltage of the motor 100 according to a preset corresponding relation between the reduction amount of the electric power and the output voltage of the motor 100. The invention does not limit the method for acquiring the preset corresponding relationship. In some embodiments, a one-to-one correspondence (such as a correspondence table) between different power consumption reduction amounts and the target voltage of the motor 100 may be preset according to the working conditions and stored in a storage device, and then obtained by table lookup; the target voltage of the motor 100 may also be calculated in real time by a relation between a decrease amount of the electric power of a preset algorithm and the target voltage of the motor 100, and then by the relation according to the decrease amount of the electric power. Specifically, according to the actual working condition, one of the methods for obtaining the reduction amount of the electric power may be selected to perform calculation, when the load throwing power is large, the target voltage of the motor 100 should be relatively small, and when the load throwing power is small, the target voltage of the motor 100 should be relatively large, so that the strategy can tolerate larger voltage fluctuation when the load is thrown. In particular, in order to avoid policy failure caused by too fast change of the target voltage along with the change of the load, the change rate of the target voltage needs to be limited when the preset corresponding relation is formulated, the change rate should be smaller when the target voltage is increased, and the change rate should be larger when the target voltage is decreased.
When the amount of power required by the load 420 of the second circuit 400 decreases (e.g., the load is turned off), since the second battery cell 410 has poor charging capability, the reduced power cannot flow into the second battery cell 410 entirely, and therefore, the output power of the DCDC converter 300 can be reduced according to the decrease of the power consumption of the load 420, and the motor 100 needs a certain time to respond to the load change in the voltage mode, and the reduced power of the DCDC converter 300 flows into the capacitor device 210 during the response, thereby causing the voltage of the first circuit 200 to increase. The voltage stabilizing control method provided by the invention can control the target voltage of the motor 100 according to the reduction amount of the electric power, and is configured in such a way that the overvoltage of the first circuit 200 can be avoided, so that the first circuit 100 operates at the first voltage. Preferably, in some embodiments, the first circuit further includes a capacitive relay (not labeled in the figures) connected to the capacitive device. Specifically, the motor 100 operates in a voltage mode to provide power for the 12V circuit side, and the capacitive device is used for voltage regulation. The capacitive device is capable of providing a small amount of power to 12V when necessary.
Specifically, referring to fig. 4, fig. 4 is a schematic diagram of a capacitive relay control method of the voltage stabilizing control method, and a hybrid structure of 48V and 12V is taken as an example. As can be seen from fig. 4: in one embodiment, if it is determined that the 48V battery cannot normally operate, if the hybrid power system is powered on, it is determined whether the capacitor relay is closed: and if the capacitor relay is not closed, controlling the DCDC converter to work in a precharge mode, and precharging the first circuit at the 48V circuit side, wherein the method specifically comprises the step of precharging the capacitor in the electric element of the first circuit to enable the voltage of the first circuit to reach a third voltage, and when the voltage of the first circuit reaches the third voltage, controlling the capacitor relay to be closed. The third voltage is an actual voltage of the capacitor, and the actual voltage can be obtained through feedback of the capacitor. The purpose of the pre-charging is to avoid damage caused by closing the capacitor relay when the voltage difference across the capacitor relay is too large. And if the capacitive relay is closed, controlling the DCDC converter to work in a boost mode, and using the DCDC converter 300 to precharge the capacitive device 210 to a fourth voltage. Specifically, the fourth voltage may be a preset target value, which in one embodiment may be determined according to a range in which the motor 100 can operate in a voltage mode, and the fourth voltage should be as low as possible, but not lower than the current actual voltage of the capacitive device 210. When the capacitor device 210 is pre-charged to the fourth voltage, the motor 100 is controlled to enter a voltage mode, the DCDC converter enters a buck mode, then a target voltage of the voltage mode of the motor 100 and a target voltage of the buck mode of the DCDC converter 300 are calculated, whether an under-voltage fault occurs on the 48V circuit side is judged, if the under-voltage fault does not exist, the motor 100 is maintained to operate in the voltage mode, the DCDC converter is operated in the buck mode, and if the under-voltage fault exists, the DCDC converter 300 is used to pre-charge the capacitor device 210 to the fourth voltage, and then voltage stabilization control is performed.
Therefore, the voltage stabilizing control method provided by the invention not only can reduce the capacity of the capacitor device of the first circuit 200 of the hybrid power system, but also can reduce the pre-charging time, the capacity and the installation space without increasing any hardware resources, thereby reducing the cost; meanwhile, the first circuit 200 can be prevented from overvoltage or undervoltage, the voltage variation of the first circuit when the load 420 is started is reduced, the larger capacitance voltage variation during load throwing can be tolerated, and the stability of the hybrid power system can be improved.
Still another embodiment of the present invention provides a voltage stabilizing control device, referring to fig. 5, fig. 5 is a schematic structural diagram of the voltage stabilizing control device provided in this embodiment. The voltage stabilizing control device provided in this embodiment is used in a hybrid power system, where the hybrid power system includes a motor 100, a first circuit 200, a DCDC converter 300, and a second circuit 400, where the motor 100 is electrically connected to the first circuit 200, the first circuit 200 is electrically connected to the second circuit 400 through the DCDC converter 300, and the second circuit 400 includes a load 420.
Specifically, the voltage stabilization control apparatus includes: an operation control unit 611, a load management unit 612, and a voltage stabilization control unit 613. Wherein the operation control unit 611 is configured to control the DCDC converter 300 to operate in a buck mode, converting the electric energy of the first circuit 200 to the second circuit 400. The load management unit 612 is configured to acquire a power usage change state of the load 420. Specifically, the method for obtaining the power consumption change state of the load may refer to the method for reducing the power consumption in the voltage stabilizing control method, which is not described herein. The voltage regulation control unit 613 is configured to control the output current limit of the DCDC converter 300 and the target voltage of the motor 100 according to the power consumption change state and a preset voltage regulation control strategy so that the first circuit 100 operates at a first voltage.
Preferably, in some embodiments, the method for controlling the output current limit value of the DCDC converter 300 and the target voltage of the motor according to the power variation state and the preset voltage regulation control strategy so that the first circuit operates at the first voltage includes:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
Because the voltage stabilizing control device provided by the invention and the voltage stabilizing control method provided by the invention belong to the same invention conception, the voltage stabilizing control device at least has the same beneficial effects as the voltage stabilizing control device, and the voltage stabilizing control device is not described in detail herein.
Still another embodiment of the present invention provides a hybrid system, referring to fig. 6, as can be seen from fig. 6, the hybrid system provided in this embodiment includes: the motor 100, the first circuit 200, the DCDC converter 300, the second circuit 400 and the voltage stabilizing control device 610 according to any of the foregoing embodiments, wherein the motor 100 is electrically connected to the first circuit 200, the first circuit 200 is electrically connected to the second circuit 400 through the DCDC converter 300, and the second circuit includes a load 420; the voltage stabilizing control device 610 is electrically connected to the motor 100, the DCDC converter 300, the first circuit 200, and the second circuit 400.
As can be appreciated, the motor 100 includes a motor circuit unit 110 and a motor control unit 120, the first circuit 200 includes a first battery unit 220, a capacitor device 210 and a circuit management unit 230, the DCDC converter 300 includes a DCDC circuit unit 310 and a DCDC control unit 320, and the voltage stabilizing control device 610 electrically connects the motor 100, the DCDC converter 300, the first circuit 200 and the second circuit 400, including: the voltage stabilizing control device 610 is connected to the motor control unit 120, the circuit management unit 230, and the DCDC control unit 320, respectively.
In particular, as will be understood by those skilled in the art, the specific functions and connection relationships of the functional components may be referred to in the related art, and will not be described in detail herein.
Specifically, the voltage stabilizing control apparatus 610 is configured to: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage.
Because the hybrid power system provided by the invention and the voltage stabilizing control method provided by the invention belong to the same invention conception, the hybrid power system at least has the same beneficial effects as the hybrid power system, and the description is omitted herein.
Based on the same inventive concept, the present invention also provides a computer readable storage medium, where computer executable instructions are stored, and when the computer executable instructions are executed, the voltage stabilizing control method of any implementation audacious is implemented. Thus, the storage medium provided by the invention, when the stored computer program is executed by the processor, converts the electric energy of the first circuit into the second circuit by controlling the DCDC converter to operate in a buck mode; acquiring the power utilization power change state of the load; and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage. By the configuration, the capacity of the capacitor device of the first circuit of the hybrid power system can be reduced, the pre-charging time is shortened, the volume of the capacitor and the installation space are reduced, and therefore the cost is reduced; meanwhile, overvoltage or undervoltage of the first circuit can be avoided, voltage change of the first circuit when a load is started is reduced, larger capacitance voltage change when the load is thrown can be tolerated, and stability of the hybrid power system can be improved.
In particular, the readable storage media of embodiments of the present invention may employ any combination of one or more computer readable media. The readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer hard disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Therefore, the voltage stabilizing control method, the voltage stabilizing control device, the hybrid power system and the storage medium provided by the invention can not only reduce the capacity of the capacitor device of the first circuit of the hybrid power system, but also reduce the pre-charging time, the capacity and the installation space, thereby reducing the cost; meanwhile, overvoltage or undervoltage of the first circuit can be avoided, voltage change of the first circuit when a load is started is reduced, larger capacitance voltage change when the load is thrown can be tolerated, and stability of the hybrid power system can be improved.
It should be noted that the apparatus and methods disclosed in the embodiments herein may be implemented in other ways. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In summary, the foregoing embodiments describe the voltage regulation control method, apparatus, hybrid system and storage medium in detail, however, the foregoing description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which includes but is not limited to the configurations set forth in the foregoing embodiments, and those skilled in the art can make any changes and modifications according to the foregoing disclosure, which are within the scope of the appended claims.
Claims (14)
1. The voltage stabilizing control method is used for a hybrid power system and is characterized by comprising a motor, a first circuit, a DCDC converter and a second circuit, wherein the motor is electrically connected with the first circuit, the first circuit is electrically connected with the second circuit through the DCDC converter, and the second circuit comprises a load;
The voltage stabilizing control method comprises the following steps:
S1: controlling the DCDC converter to operate in a buck mode, and converting the electric energy of the first circuit into the second circuit;
S2: acquiring the power utilization power change state of the load;
S3: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage.
2. The voltage stabilization control method according to claim 1, wherein the first circuit includes a first battery cell and a capacitor device connected in parallel therewith, and further comprising, before step S1, the steps of:
Pre-charging the first circuit and/or the capacitive device when the hybrid system is started or when the first circuit is under-voltage;
if it is determined that the voltage of the first circuit reaches the first voltage, step S1 is performed.
3. The voltage regulation control method according to claim 2, wherein in step S2, the method of acquiring the power consumption change state of the load includes:
and obtaining the reduction amount of the electric power according to the current power of the DCDC converter and the basic power of the load.
4. The voltage regulation control method of claim 3, wherein the method of obtaining a reduction amount of the electric power from the present power of the DCDC converter and the base power of the load comprises:
And obtaining a difference value between the current power of the DCDC converter and the basic power of the load, and taking the difference value as the reduction amount of the electric power.
5. The voltage regulation control method of claim 3, wherein the method of obtaining a reduction amount of the electric power from the present power of the DCDC converter and the base power of the load comprises:
acquiring a difference value between the current power of the DCDC converter and the basic power of the load as a first load throwing power;
acquiring working condition parameters of the hybrid power system, acquiring preset load throwing power of the second circuit according to the working condition parameters and a preset load throwing strategy, and taking the preset load throwing power as second load throwing power;
and taking the minimum value of the first throwing load power and the second throwing load power as the reduction amount of the electric power.
6. The voltage regulation control method of claim 3, wherein the method of obtaining a reduction amount of the electric power from the present power of the DCDC converter and the base power of the load comprises: and controlling the on-off state of the load through load management and/or acquiring the reduction amount of the electric power in real time.
7. The voltage regulation control method according to claim 3, wherein in step S3, the method of controlling the output current limit of the DCDC converter and the target voltage of the motor according to the power consumption change state and a preset voltage regulation control strategy includes:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
8. The method according to claim 7, wherein the controlling the output current limit of the DCDC converter in real time according to the first preset strategy includes obtaining the output current limit by:
idcdc,max＝idcdc,act+di
Wherein i dcdc,max is the output current limit value of the DCDC converter, i dcdc,act is the real-time current value of the DCDC converter, and d i is the preset variation current of the DCDC converter.
9. The method according to claim 8, wherein the preset variation current is calibrated according to an operation condition of the hybrid system and a performance parameter of the DCDC converter.
10. The voltage regulation control method of claim 7, wherein the controlling the target voltage of the motor in real time according to the reduced amount of the electric power and a second preset strategy includes obtaining the target voltage by:
And obtaining the target voltage of the motor according to the preset corresponding relation between the reduction amount of the power consumption and the output voltage of the motor.
11. The voltage stabilizing control device is used for a hybrid power system and is characterized by comprising a motor, a first circuit, a DCDC converter and a second circuit, wherein the motor is electrically connected with the first circuit, the first circuit is electrically connected with the second circuit through the DCDC converter, and the second circuit comprises a load;
the voltage stabilizing control device comprises:
an operation control unit configured to control the DCDC converter to operate in a buck mode, converting electric energy of the first circuit to the second circuit;
A load management unit configured to acquire a power usage change state of the load;
And a voltage stabilizing control unit configured to control an output current limit value of the DCDC converter and a target voltage of the motor according to the power consumption change state and a preset voltage stabilizing control strategy so that the first circuit operates at a first voltage.
12. The voltage regulation control of claim 11, wherein the method of controlling the output current limit of the DCDC converter and the target voltage of the motor to operate the first circuit at a first voltage based on the power usage change state and a preset voltage regulation control strategy comprises:
according to a first preset strategy, controlling the output current limit value of the DCDC converter in real time;
and controlling the target voltage of the motor in real time according to the reduction amount of the electric power and a second preset strategy.
13. A hybrid system, comprising: a motor, a first circuit, a DCDC converter, a second circuit, and the voltage stabilizing control device according to claim 11 or 12, the motor being electrically connected to the first circuit, the first circuit being electrically connected to the second circuit through the DCDC converter, the second circuit including a load; the voltage stabilizing control device is electrically connected with the motor, the DCDC converter, the first circuit and the second circuit;
The voltage stabilization control apparatus is configured to: and controlling the output current limit value of the DCDC converter and the target voltage of the motor according to the power utilization change state and a preset voltage stabilizing control strategy so as to enable the first circuit to operate at a first voltage.
14. A computer-readable storage medium having stored thereon computer-executable instructions that when executed implement the steps of the voltage regulation control method of any one of claims 1 to 10.
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