CN113410859A - Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger - Google Patents
Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger Download PDFInfo
- Publication number
- CN113410859A CN113410859A CN202110731711.6A CN202110731711A CN113410859A CN 113410859 A CN113410859 A CN 113410859A CN 202110731711 A CN202110731711 A CN 202110731711A CN 113410859 A CN113410859 A CN 113410859A
- Authority
- CN
- China
- Prior art keywords
- bidirectional
- current
- bus
- battery
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 36
- 238000007600 charging Methods 0.000 claims abstract description 35
- 238000010277 constant-current charging Methods 0.000 claims description 10
- 238000010280 constant potential charging Methods 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 102100031786 Adiponectin Human genes 0.000 description 2
- 101000775469 Homo sapiens Adiponectin Proteins 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 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 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
-
- 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
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
-
- 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
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The application provides a control method of a vehicle-mounted bidirectional charger and the vehicle-mounted bidirectional charger, and the control method comprises the following steps: responding to a working mode indicated by a charging and discharging instruction sent by the vehicle-mounted terminal, and controlling the current trend in the bidirectional DC/DC converter according to the working mode; and controlling the current trend in the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus. According to the method and the device, the current trend in the bidirectional DC/DC converter is controlled according to the working mode indicated by the charging and discharging instruction, and the current trend in the bidirectional AC/DC converter is controlled according to the voltage sampling value of the bus and the reference voltage of the bus, so that the current trends in the bidirectional AC/DC converter and the bidirectional DC/DC converter are smoothly switched, and the switching process of different algorithms is cancelled, so that the impact on a power grid during the traditional charging and discharging inversion can be reduced, and the safety of the power grid is improved.
Description
Technical Field
The application belongs to the technical field of charging and discharging of a vehicle-mounted charger, and particularly relates to a control method of the vehicle-mounted bidirectional charger and the vehicle-mounted bidirectional charger.
Background
At present, a conventional Vehicle-to-grid (V2G) control method includes a bidirectional AC/DC controller and a bidirectional DC/DC controller, wherein the bidirectional AC/DC controller includes a bus voltage control, a grid current double closed loop control and a phase locked loop PLL control, and when the bidirectional AC/DC controller simulates charging of an electric Vehicle battery, the bidirectional AC/DC controller operates in a PWM rectification state, and a grid-side voltage and a current are in phase; when the bidirectional AC/DC controller simulates the grid-connected discharge of the battery of the electric automobile, the bidirectional AC/DC controller works in a PWM inversion state, and the voltage and the current on the grid side are in opposite phases; the bidirectional AC/DC control mode needs to switch control algorithms when the battery is charged and discharged in a grid-connected mode, and real-time smooth switching cannot be performed.
The bidirectional DC/DC controller comprises bus voltage control, constant current charging is adopted at the initial stage of battery charging through PWM modulation when the bidirectional DC/DC controller simulates the charging of an electric automobile battery, constant current and constant voltage charging is adopted when the bus voltage reaches a set value, and hysteresis loop control is adopted between constant voltage and constant current switching; when the bidirectional DC/DC controller simulates the grid-connected discharge of the battery of the electric automobile, the algorithm needs to be switched in the bidirectional DC/DC control mode when the battery is charged and discharged in a grid-connected mode through PWM modulation and constant-current discharge, and smooth real-time switching cannot be realized.
Meanwhile, the conventional vehicle-to-grid control method also includes: the topology of the power converter of the V2G bidirectional charger is a three-phase full-bridge PWM converter and a dual-active bridge converter, but smooth switching cannot be realized when the battery charging and grid-connected discharging are switched.
Therefore, in the conventional technical scheme, when two working modes of battery charging and grid-connected discharging are switched, a control algorithm needs to be switched, and smooth switching cannot be realized.
Disclosure of Invention
The application aims to provide a control method of a vehicle-mounted bidirectional charger and the vehicle-mounted bidirectional charger, and aims to solve the problem that smooth switching cannot be realized when the traditional vehicle-mounted bidirectional charger charges and discharges.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a control method for a vehicle-mounted bidirectional charger, which is applied to the vehicle-mounted bidirectional charger, where the vehicle-mounted bidirectional charger includes a bidirectional AC/DC converter and a bidirectional DC/DC converter, and includes:
responding to a working mode indicated by a charging and discharging instruction sent by a vehicle-mounted terminal, and controlling the current trend in the bidirectional DC/DC converter according to the working mode;
and controlling the current trend in the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus.
In one possible embodiment of the first aspect, the operation mode includes a constant voltage charging mode, a constant current charging mode, and a grid-connected discharging mode.
In another possible implementation manner of the first aspect, the controlling a current profile in the bidirectional DC/DC converter according to the operation mode includes:
and when the working mode is the constant-voltage charging mode, controlling the reference voltage of the battery to be the limiting voltage of the battery.
In another possible implementation manner of the first aspect, the controlling a current profile in the bidirectional DC/DC converter according to the operation mode includes:
and when the working mode is a constant current charging mode, controlling the reference voltage of the battery to be the limiting voltage of the battery, and controlling the reference current of the battery to be the limiting current of the battery.
In another possible implementation manner of the first aspect, the controlling a current profile in the bidirectional DC/DC converter according to the operation mode includes:
and when the working mode is a grid-connected discharging mode, controlling the reference voltage of the battery to be the lowest voltage allowed by the battery to discharge, and controlling the reference current of the battery to be the grid-connected current.
In another possible implementation manner of the first aspect, the grid-connected current is calculated by the following formula:
wherein igFor grid-connected current, PgFor grid-connected power preset value, UdcAnd eta is the output voltage sampling value of the battery, and eta is the efficiency of the device.
In another possible embodiment of the first aspect, the controlling a current profile in the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus includes:
and judging the voltage sampling value of the bus and the reference voltage of the bus, and controlling the current to flow from the power grid side to the bus side when the voltage sampling value of the bus is lower than the reference voltage of the bus, otherwise, controlling the current to flow from the bus side to the power grid side.
In another possible implementation manner of the first aspect, before the operating mode indicated by the charging and discharging instruction sent in response to the vehicle-mounted terminal, the method further includes:
after a starting instruction sent by a vehicle-mounted terminal is responded, the bidirectional AC/DC converter is started and charges a bus, and the bidirectional DC/DC converter is started until a voltage sampling value of the bus reaches the reference voltage of the bus.
In a second aspect, an embodiment of the present application provides a bidirectional charger, configured to execute the control method.
Compared with the prior art, the embodiment of the application has the advantages that: according to the control method of the vehicle-mounted bidirectional charger, the current trend in the bidirectional DC/DC converter is controlled according to the working mode indicated by the charging and discharging instruction, and the current trend in the bidirectional AC/DC converter is controlled according to the voltage sampling value of the bus and the reference voltage of the bus, so that the current trends in the bidirectional AC/DC converter and the bidirectional DC/DC converter are smoothly switched, the switching process of different algorithms is cancelled, the impact on a power grid during the traditional charging and discharging inversion can be reduced, and the safety of the power grid is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a circuit diagram of a vehicle-mounted bidirectional charger of a control method of the vehicle-mounted bidirectional charger according to an embodiment of the present application;
fig. 2 is a flowchart of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application;
fig. 3 is a flowchart of a bidirectional DC/DC controller of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application;
fig. 4 is a flowchart of a bidirectional AC/DC controller of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application;
fig. 5 is a circuit diagram of a bidirectional AC/DC converter of a conventional vehicle-mounted bidirectional charger.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
At present, the control modes of a bidirectional AC/DC controller and a bidirectional DC/DC controller are as follows: the control algorithm is required to be switched during battery charging and grid-connected discharging, and real-time smooth switching cannot be realized, wherein the smooth switching is realized by two different control algorithms currently when two modes of battery charging and grid-connected discharging are changed, and the problem of power grid impact caused by voltage, current sudden change and the like is generally generated when the two different control algorithms are switched, so that the safety of the power grid is reduced.
Therefore, the control method of the vehicle-mounted bidirectional charger controls the current trend of the bidirectional AC/DC converter through the voltage sampling value of the bus and the reference voltage of the bus, controls the current trend in the bidirectional DC/DC converter through controlling the reference voltage and the reference current of the battery, and cancels the switching process of different algorithms, so that the impact on a power grid during charging and discharging inversion can be reduced, and the safety of the power grid is improved.
The following description is made by way of example with reference to the accompanying drawings for a control method of a vehicle-mounted bidirectional charger provided by the present application:
fig. 1 shows a circuit diagram of a vehicle-mounted bidirectional charger of a control method of the vehicle-mounted bidirectional charger according to a first embodiment of the present application, and as shown in fig. 1, for convenience of description, only parts related to the present embodiment are shown, and details are as follows: the V2G vehicle-mounted bidirectional charger comprises a bidirectional AC/DC converter and a bidirectional DC/DC converter, and is characterized in that current is defined to be charged from a power grid side to a battery side through a bus side to charge a positive battery, and current is defined to be discharged from the battery side to the power grid side through the bus side to discharge negative grid-connected discharge.
Fig. 2 shows a flowchart of a control method of a vehicle-mounted bidirectional charger according to a first embodiment of the present application, and as shown in fig. 2, the method includes:
responding to a working mode indicated by a charging and discharging instruction sent by the vehicle-mounted terminal, and controlling the current trend in the bidirectional DC/DC converter according to the working mode; and controlling the current trend in the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus.
The charging mode and the discharging mode of the bidirectional AC/DC converter adopt a set of control method, and the charging mode and the discharging mode of the bidirectional DC/DC converter adopt a set of control method, and the charging mode and the discharging mode are controlled separately and do not interfere with each other. Controlling the current trend in the bidirectional DC/DC converter according to the working mode indicated by the charging and discharging instruction, and when the working mode is charging, controlling the reference voltage of the battery and the reference current of the battery to enable the current in the bidirectional DC/DC converter to flow from the bus side to the battery side for charging operation; when the working mode is discharging, the discharging operation is carried out by controlling the reference voltage of the battery and the reference current of the battery so that the current in the bidirectional DC/DC converter flows from the battery side to the bus side.
The current trend of the bidirectional AC/DC converter is controlled through the voltage sampling value of the bus and the reference voltage of the bus, when the voltage sampling value of the bus is lower than the reference voltage of the bus, the current is controlled to flow from the power grid side to the bus side, and otherwise, the current is controlled to flow from the bus side to the power grid side. Therefore, the current trend in the bidirectional DC/DC converter and the bidirectional AC/DC converter can be controlled without a switching algorithm, natural switching of energy is realized, impact on a power grid during traditional charging and discharging inversion is reduced, and the safety of the power grid is improved.
In the embodiment of the application, the working modes indicated by the charging and discharging instructions generally include a constant voltage charging mode, a constant current charging mode and a grid-connected discharging mode, so as to realize three different charging and discharging modes of the vehicle-mounted bidirectional charger.
Fig. 3 shows a flowchart of a bidirectional DC/DC controller of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application, and as shown in fig. 3, in the embodiment of the present application, G1v(s) is a first voltage loop controller, G1c(s) is a first current loop controller, u is a second current loop controllerrefIs the reference voltage of the battery, udcSampling value of output voltage of battery ilimitIs one of the reference currents of the battery, i.e. a constant current state output current is given, idcFor sampling the output current of the battery, pgFor grid-connected power presets, igThe calculated grid-connected current is given according to the grid-connected power.
Selecting a reference voltage u of the battery according to the operation moderefIf operating in battery charging mode, urefLimiting the voltage for the battery; if the operation is in the grid-connected discharge mode, urefThe lowest voltage at which the battery is allowed to discharge. Reference voltage u of batteryrefAnd the output voltage sampling value u of the batterydcThe difference of (a) is used as an input of the first voltage ring controller G1v(s), and the output of the first voltage ring controller G1v(s) is used as a reference current i of the batteryrefReference current i of the batteryrefAnd the output current sampling value i of the batterydcThe difference value of (a) is used as the input of a first current loop controller G1c(s), the output of the first current loop controller G1c(s) is used as a first debugging signal, and the current trend of the bidirectional DC/DC converter is controlled by adjusting the duty ratio or frequency, wherein the first voltage loop controller G1v(s) and the first current loop controller G1c(s) are common PID regulators, P is proportional control, I is integral control, and D is differential control.
Controlling a current profile within a bi-directional DC/DC converter according to an operating mode, comprising: when the working mode is the constant voltage charging mode, the reference voltage u of the battery is controlledrefThe reference current of the battery is the output of the first voltage loop controller G1v(s) for the limit voltage of the battery, so that the current in the bidirectional DC/DC converter is controlled to flow from the bus side to the battery side in a constant voltage manner for the charging operation by the bidirectional DC/DC controller acquiring the first modulation signal SPWM1 from the battery limit voltage and the output of the first voltage loop controller G1 v(s).
Controlling a current profile within a bi-directional DC/DC converter according to an operating mode, comprising: when the working mode is the constant current charging mode, the reference voltage u of the battery is controlledrefControlling a reference current of the battery to be a limiting current of the battery for a limiting voltage of the battery, so as to control a current in the bidirectional DC/DC converter to flow from a bus side to a battery side in a constant current manner for a charging operation by acquiring a first modulation signal SPWM1 through the bidirectional DC/DC controller according to the limiting voltage of the battery and the limiting current of the battery; wherein, because the reference voltage of the battery in the constant current charging mode is always greater than the output voltage sampling value (actual output voltage) of the battery, the first voltage loop controller is saturated in the positive direction, and the reference current i of the battery is saturatedrefLimited current i limited by upper limit to batterylimitI.e. the constant current state output current as described above is given.
Controlling a current profile within a bi-directional DC/DC converter according to an operating mode, comprising: when the working mode is a grid-connected discharging mode, the reference voltage of the battery is controlled to be the lowest voltage allowed by the battery to be discharged, the reference current of the battery is controlled to be grid-connected current, and therefore the bidirectional DC/DC controller obtains a first modulation signal according to the lowest voltage allowed by the battery to be discharged and the grid-connected current, and the current in the bidirectional DC/DC converter is controlled to flow from the battery side to the bus side to perform discharging operation. Wherein, because the reference voltage of the grid-connected discharge mode is always smaller than the output voltage sampling value (actual output voltage) of the battery, the first voltage loop controller is in negative saturation, and the reference current i of the battery isrefThe grid-connected current is limited to grid-connected discharge by the lower limit, that is, in the grid-connected discharge mode, the grid-connected current is negative, and the current flows from the battery side to the bus side.
The three working modes of constant-voltage charging, constant-current charging and grid-connected discharging can be determined by one controller, the charging controller and the discharging controller do not need to be switched, and the energy can be naturally switched in the forward direction and the reverse direction.
The calculation formula of the grid-connected current is as follows:
wherein igFor grid-connected current, PgFor grid-connected power preset value, UdcAnd eta is the output voltage sampling value of the battery, and eta is the efficiency of the device.
In the embodiment of the application, grid-connected current igBy presetting value P of grid-connected powergOutput voltage sampling value U of batterydcAnd the equipment efficiency eta are determined together, and can be changed according to actual needs.
Fig. 4 shows a flowchart of a bidirectional AC/DC controller of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application, and as shown in fig. 4, a reference voltage U of a bus is given according to a battery voltage and a transformation ratio of a hardware transformer (T in fig. 1)dcrefSampling the voltage value U of the busrdcAs feedback, the reference voltage U of the busdcrefVoltage sampling value U of sum busrdcThe difference value of the first voltage loop controller G2v(s) is used as the input of the second voltage loop controller G2v(s), and the output of the second voltage loop controller G2v(s) and the current sampling value i of the inductor are used as the input of the second voltage loop controller G2v(s)aIs used as input for the second current loop controller G2c(s), and the output of the second current loop controller G2c(s) is combined as feed-forward grid voltage sample value uaAnd obtaining a second debugging signal SPWM2, and controlling the current trend of the bidirectional AC/DC converter by adjusting the duty ratio or the frequency, wherein the second voltage loop controller G2v(s) and the second current loop controller G2c(s) are common PID regulators, P is proportional control, I is integral control, and D is differential control.
Controlling the current trend of the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus, and the method comprises the following steps: and judging the voltage sampling value of the bus and the reference voltage of the bus, and controlling the current to flow from the power grid side to the bus side when the voltage sampling value of the bus is lower than the reference voltage of the bus, otherwise, controlling the current to flow from the bus side to the power grid side.
In the embodiment of the application, the voltage sampling value of the bus and the reference voltage of the bus are judged, when the voltage sampling value of the bus is lower than the reference voltage of the bus, the output of the second current loop controller G2c(s) is positive, and the current in the bidirectional AC/DC converter is controlled to flow from the power grid side to the bus side to perform the battery charging operation; on the contrary, when the voltage sampling value of the bus is not lower than the reference voltage of the bus, it means that the output of the second current loop controller G2c(s) is negative, and the current in the bidirectional AC/DC converter is controlled to flow from the bus side to the grid side for grid-connected discharging operation, thereby realizing natural commutation of energy/current in both directions without switching the charge controller and the discharge controller, wherein the second voltage loop controller G2v(s) and the second current loop controller G2c(s) are common PID regulators, P is proportional control, I is integral control, and D is differential control.
In the embodiment of the present application, the reference voltage U of the busdcrefFrom the reference voltage U of the batteryrefAnd the transformation ratio K of the transformer (i.e., the transformer T in fig. 1) in the bidirectional DC/DC converter, i.e.: u shapedcref＝K*Uref. For example, the reference voltage U of the batteryref450V, the transformation ratio of the transformer T is 2:1, namely the reference voltage U of the busdcref450V × 2 ═ 900V.
The starting method of the vehicle-mounted bidirectional charger comprises the following steps:
before responding to the working mode indicated by the charging and discharging instruction sent by the vehicle-mounted terminal, the method further comprises the following steps: and after responding to a starting instruction sent by the vehicle-mounted terminal, starting the bidirectional AC/DC converter and charging the bus until the voltage sampling value of the bus reaches the reference voltage of the bus, and starting the bidirectional DC/DC converter.
In the embodiment of the application, after a starting-up instruction sent by a vehicle-mounted terminal is received, a bidirectional ACDC converter is started from a power grid side and charges a bus capacitor (C1 in fig. 1); after the start of the bidirectional ACDC converter is finished, when the voltage sampling value of the bus reaches the reference voltage of the bus, the bidirectional DCDC converter is started according to the working mode.
The embodiment of the application also discloses a vehicle-mounted bidirectional charger, which is used for executing the control method.
Fig. 5 shows a circuit diagram of a bidirectional AC/DC converter of a conventional vehicle-mounted bidirectional charger, and as shown in fig. 5, a grid-connected relay (i.e., Rly1 in fig. 5) is arranged in the bidirectional AC/DC converter of the conventional vehicle-mounted bidirectional charger, and in the starting mode of the embodiment of the present application, when a battery is charged or discharged in a grid-connected manner, due to the unification of battery charging and grid-connected discharging algorithms of the bidirectional AC/DC converter and the bidirectional AC/DC converter, not only the start-up logic is simple, but also the grid-connected relay (Rly 1 in fig. 5) in the bidirectional AC/DC converter can be saved, thereby saving the cost of the product and increasing the reliability. Meanwhile, the charge-discharge control method and the starting method of the V2G vehicle-mounted bidirectional charger are also applicable to the topology of three-phase V2G.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed bidirectional charger and method may be implemented in other manners. For example, the above-described embodiments of the bidirectional charger are merely illustrative, and for example, the division of a module or a unit is only a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A control method of a vehicle-mounted bidirectional charger is applied to the vehicle-mounted bidirectional charger, the vehicle-mounted bidirectional charger comprises a bidirectional AC/DC converter and a bidirectional DC/DC converter, and the control method is characterized by comprising the following steps:
responding to a working mode indicated by a charging and discharging instruction sent by a vehicle-mounted terminal, and controlling the current trend in the bidirectional DC/DC converter according to the working mode;
and controlling the current trend in the bidirectional AC/DC converter based on the voltage sampling value of the bus and the reference voltage of the bus.
2. The control method according to claim 1, wherein the operation mode includes a constant voltage charging mode, a constant current charging mode, and a grid-connected discharging mode.
3. The control method of claim 2, wherein said controlling a current profile within said bidirectional DC/DC converter according to said operating mode comprises:
and when the working mode is the constant-voltage charging mode, controlling the reference voltage of the battery to be the limiting voltage of the battery.
4. The control method of claim 2, wherein said controlling a current profile within said bidirectional DC/DC converter according to said operating mode comprises:
and when the working mode is a constant current charging mode, controlling the reference voltage of the battery to be the limiting voltage of the battery, and controlling the reference current of the battery to be the limiting current of the battery.
5. The control method of claim 2, wherein said controlling a current profile within said bidirectional DC/DC converter according to said operating mode comprises:
and when the working mode is a grid-connected discharging mode, controlling the reference voltage of the battery to be the lowest voltage allowed by the battery to discharge, and controlling the reference current of the battery to be the grid-connected current.
6. The control method according to claim 5, wherein the grid-connected current is calculated by the formula:
wherein igFor grid-connected current, PgFor grid-connected power preset value, UdcAnd eta is the output voltage sampling value of the battery, and eta is the efficiency of the device.
7. The control method of claim 1, wherein controlling the current profile in the bidirectional AC/DC converter based on the voltage samples of the bus and a reference voltage of the bus comprises:
and judging the voltage sampling value of the bus and the reference voltage of the bus, and controlling the current to flow from the power grid side to the bus side when the voltage sampling value of the bus is lower than the reference voltage of the bus, otherwise, controlling the current to flow from the bus side to the power grid side.
8. The control method according to any one of claims 1 to 7, characterized by, prior to the operation mode indicated in response to the charge-discharge instruction transmitted from the in-vehicle terminal, further comprising:
after a starting instruction sent by a vehicle-mounted terminal is responded, the bidirectional AC/DC converter is started and charges a bus, and the bidirectional DC/DC converter is started until a voltage sampling value of the bus reaches the reference voltage of the bus.
9. A vehicle-mounted bidirectional charger, characterized by being configured to execute the control method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731711.6A CN113410859A (en) | 2021-06-29 | 2021-06-29 | Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731711.6A CN113410859A (en) | 2021-06-29 | 2021-06-29 | Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113410859A true CN113410859A (en) | 2021-09-17 |
Family
ID=77680253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110731711.6A Pending CN113410859A (en) | 2021-06-29 | 2021-06-29 | Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113410859A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116488127A (en) * | 2023-06-21 | 2023-07-25 | 广汽埃安新能源汽车股份有限公司 | Direct-current bus overvoltage active protection device and method and vehicle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222958A (en) * | 2011-06-21 | 2011-10-19 | 清华大学深圳研究生院 | Vehicle-mounted bidirectional charger for electric automobile |
| CN102570560A (en) * | 2012-01-18 | 2012-07-11 | 华北电力大学（保定） | Charging-discharging system for V2G bilateral power conversion electric automobile and control method thereof |
| CN108215918A (en) * | 2018-02-01 | 2018-06-29 | 武汉斯马特益电子技术有限公司 | A kind of new-energy automobile high-pressure system circuit |
| CN108988451A (en) * | 2018-07-30 | 2018-12-11 | 南京航空航天大学无锡研究院 | Isolation type bidirectional charger control method and control circuit |
| JP2019079137A (en) * | 2017-10-20 | 2019-05-23 | トヨタ自動車株式会社 | Vehicle and computing system |
| JP2019122174A (en) * | 2018-01-09 | 2019-07-22 | パナソニックＩｐマネジメント株式会社 | Device and method for controlling on-vehicle battery temperature |
| CN210101344U (en) * | 2019-03-13 | 2020-02-21 | 浙江吉利汽车研究院有限公司 | Vehicle-to-vehicle direct current charging device, vehicle and system |
| CN212463070U (en) * | 2020-05-11 | 2021-02-02 | 杭州富特科技股份有限公司 | DCDC converter, vehicle-mounted charging device, system and vehicle |
-
2021
- 2021-06-29 CN CN202110731711.6A patent/CN113410859A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222958A (en) * | 2011-06-21 | 2011-10-19 | 清华大学深圳研究生院 | Vehicle-mounted bidirectional charger for electric automobile |
| CN102570560A (en) * | 2012-01-18 | 2012-07-11 | 华北电力大学（保定） | Charging-discharging system for V2G bilateral power conversion electric automobile and control method thereof |
| JP2019079137A (en) * | 2017-10-20 | 2019-05-23 | トヨタ自動車株式会社 | Vehicle and computing system |
| JP2019122174A (en) * | 2018-01-09 | 2019-07-22 | パナソニックＩｐマネジメント株式会社 | Device and method for controlling on-vehicle battery temperature |
| CN108215918A (en) * | 2018-02-01 | 2018-06-29 | 武汉斯马特益电子技术有限公司 | A kind of new-energy automobile high-pressure system circuit |
| CN108988451A (en) * | 2018-07-30 | 2018-12-11 | 南京航空航天大学无锡研究院 | Isolation type bidirectional charger control method and control circuit |
| CN210101344U (en) * | 2019-03-13 | 2020-02-21 | 浙江吉利汽车研究院有限公司 | Vehicle-to-vehicle direct current charging device, vehicle and system |
| CN212463070U (en) * | 2020-05-11 | 2021-02-02 | 杭州富特科技股份有限公司 | DCDC converter, vehicle-mounted charging device, system and vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116488127A (en) * | 2023-06-21 | 2023-07-25 | 广汽埃安新能源汽车股份有限公司 | Direct-current bus overvoltage active protection device and method and vehicle |
| CN116488127B (en) * | 2023-06-21 | 2024-03-26 | 广汽埃安新能源汽车股份有限公司 | Direct-current bus overvoltage active protection device and method and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109889077B (en) | Single-phase and three-phase compatible AC/DC circuit and charging and discharging device | |
| EP3902092B1 (en) | Electric motor driving apparatus, control method, vehicle, and readable storage medium | |
| CN103684202B (en) | Integrated driving and the electric machine controller of charging/discharging function | |
| CN106564392B (en) | Automobile wireless charging system and automobile wireless charging unit | |
| CN112389269B (en) | Automobile, energy conversion device and energy conversion method | |
| KR20180058587A (en) | A electric vehicle on-board charger with a high power capacity | |
| JP2011103761A (en) | Power conversion device | |
| CN211107009U (en) | Vehicle-mounted charger integrating high-voltage DC-DC | |
| CN114590140B (en) | Charging and discharging management system of electric automobile | |
| CN105790398A (en) | Semi vehicle-mounted rapid charging method and charging device of power-driven bus | |
| CN113410859A (en) | Control method of vehicle-mounted bidirectional charger and vehicle-mounted bidirectional charger | |
| CN114221535A (en) | Vehicle-mounted charger, DCDC converter and control method | |
| KR101191738B1 (en) | Power converter unit | |
| KR102518625B1 (en) | Apparatus and method for controlling fails safe of dual low voltage dc-dc converter | |
| JP2014027857A (en) | Charge and discharge device | |
| CN112297894A (en) | Integrated vehicle-mounted charger with wide-range output | |
| CN114362334A (en) | Charging device and vehicle with same | |
| CN109690929B (en) | Control method and control device of power factor correction circuit and vehicle | |
| US11190075B2 (en) | Drive system | |
| CN115943538A (en) | Power battery voltage regulating circuit and system, and control method and control device thereof | |
| CN111193302B (en) | Control method and system of bidirectional vehicle-mounted charger | |
| CN113619409A (en) | Vehicle-mounted power supply system, vehicle and charging and discharging control method | |
| CN219875184U (en) | Motor drive circuit and vehicle | |
| CN219875095U (en) | Power supply circuit and vehicle | |
| CN104917195A (en) | Static synchronous series compensation device and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 710000 Room 101, building a, building 6, digital economy industrial park, No. 201, Pufeng Road, high tech Zone, Xi'an, Shaanxi Province Applicant after: Xi'an telingchong New Energy Technology Co.,Ltd. Address before: 710000 Room 101, building a, building 6, digital economy industrial park, No. 201, Pufeng Road, high tech Zone, Xi'an, Shaanxi Province Applicant before: Xi'an teride lingchong New Energy Technology Co., Ltd |