CN113291173A - Charging device, method and system - Google Patents
Charging device, method and system Download PDFInfo
- Publication number
- CN113291173A CN113291173A CN202110753661.1A CN202110753661A CN113291173A CN 113291173 A CN113291173 A CN 113291173A CN 202110753661 A CN202110753661 A CN 202110753661A CN 113291173 A CN113291173 A CN 113291173A
- Authority
- CN
- China
- Prior art keywords
- target
- charging
- current
- module
- charging module
- 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
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/51—Photovoltaic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- 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
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
-
- 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
- B60L2210/00—Converter types
- B60L2210/30—AC to DC converters
-
- 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
- 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
- Y02T90/12—Electric charging stations
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging device, which is applied to a charging system adopting a photovoltaic assembly and power grid combined power supply. Charging energy sources of the charging device come from the photovoltaic module and the power grid, and charging current provided by the photovoltaic module and the power grid to equipment to be charged is controllable, so that the following effects are achieved: according to the charging current requirement of the equipment to be charged, the charging current provided by the photovoltaic module and the power grid to the equipment to be charged is reasonably regulated and controlled, so that the required electric energy is provided for the equipment to be charged. The invention also discloses a charging method and a charging system, which have the same beneficial effects as the charging device.
Description
Technical Field
The invention relates to the field of electric automobile charging, in particular to a charging device, a charging method and a charging system.
Background
The charging station of the electric vehicle usually adopts the power grid for power supply, and the charging principle is as follows: and converting the alternating current output by the power grid into direct current, and charging the electric automobile by using the converted direct current. However, in the single grid power supply mode, the charging station needs to pay a high electricity-taking fee to the power grid provider, which results in high operation cost of the charging station.
With the development of photovoltaic systems, most charging stations begin to adopt a combination of a photovoltaic module and a power grid for power supply, and the charging principle is as follows: the alternating current output by the power grid is converted into direct current, and the converted direct current is combined with the direct current output by the photovoltaic module to charge the electric automobile. Because the photovoltaic module directly utilizes solar energy for power generation, compared with a single power grid power supply mode, the power supply mode combining the photovoltaic module and the power grid reduces the operation cost of the charging station.
However, due to the input characteristics of the photovoltaic module (the intensity of sunlight influences the input of the photovoltaic module), the output current of the photovoltaic module is unstable, and when the photovoltaic module is applied to charging of an electric vehicle, the total charging current of the electric vehicle fluctuates greatly, and even a current overshoot phenomenon may occur, so that the charging reliability is reduced.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a charging device, a charging method and a charging system, wherein charging energy is from a photovoltaic module and a power grid, and charging current provided by the photovoltaic module and the power grid to a device to be charged is controllable, so that the following effects are achieved: according to the charging current requirement of the equipment to be charged, the charging current provided by the photovoltaic module and the power grid to the equipment to be charged is reasonably regulated and controlled, so that the required electric energy is provided for the equipment to be charged.
In order to solve the above technical problem, the present invention provides a charging device applied to a charging system using a combination of a photovoltaic module and a power grid for power supply, comprising:
the photovoltaic charging module is used for carrying out DC/DC conversion on the direct current output by the photovoltaic module;
the direct current charging module is used for performing AC/DC conversion on alternating current output by the power grid;
the control module is used for distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged according to the charging current requirement of the target equipment to be charged, distributing respective corresponding target output currents according to a preset current distribution strategy, and generating a control instruction according to the target photovoltaic charging module, the target direct current charging module and the respective corresponding target output currents;
and the power distribution module is used for controlling the on-off of a switch circuit on a charging circuit between the photovoltaic charging module and the direct current charging module and among a plurality of devices to be charged according to a control instruction received from the control module so as to communicate the target photovoltaic charging module and the target direct current charging module with the target devices to be charged, so that the target photovoltaic charging module and the target direct current charging module output target output current to jointly provide the required electric energy for the target devices to be charged.
Preferably, the control module executes the preset current distribution strategy in the power distribution module to generate a control instruction.
Preferably, the preset current distribution strategy is as follows:
taking the maximum output current of the target photovoltaic charging module as the target output current corresponding to the target photovoltaic charging module;
and subtracting the maximum output current from the charging current requirement of the target equipment to be charged to obtain the target output current corresponding to the target direct current charging module.
Preferably, the target photovoltaic charging module is further configured to:
uploading the input voltage, the input current, the output voltage and the output current of the power distribution module at different moments;
correspondingly, the power distribution module is specifically configured to:
according to the input voltage, the input current, the output voltage and the output current which are uploaded by the target photovoltaic charging module at the previous moment, the input power and the output power which correspond to the target photovoltaic charging module at the previous moment are obtained;
when the output power corresponding to the previous moment is smaller than the input power, increasing the output current uploaded by the target photovoltaic charging module at the previous moment by a preset multiple to obtain the target output current corresponding to the target photovoltaic charging module at the current moment;
subtracting a target output current corresponding to the target photovoltaic charging module at the current moment from the charging current requirement of the target device to be charged to obtain a target output current corresponding to the target direct current charging module at the current moment;
judging whether the output power corresponding to the target photovoltaic charging module at the moment reaches the maximum output power of the target photovoltaic charging module; if not, returning to the step of calculating the input power and the output power corresponding to the target photovoltaic charging module at the last moment according to the input voltage, the input current, the output voltage and the output current uploaded by the target photovoltaic charging module at the last moment; and if so, stopping adjusting the target output current corresponding to the target photovoltaic charging module.
Preferably, the target photovoltaic charging module is further configured to:
increasing the output current of the power distribution module at the previous moment by a preset multiple, and uploading the increased output current value to the power distribution module;
judging whether the output power corresponding to the increased output current value reaches the maximum output power of the output power; if not, returning to execute the step of increasing the output current of the current transformer by a preset multiple at the previous moment; if so, stopping increasing the output current of the converter;
correspondingly, the power distribution module is specifically configured to:
receiving the increased output current value uploaded by the target photovoltaic charging module at the previous moment, and taking the increased output current value uploaded at the previous moment as the target output current corresponding to the target photovoltaic charging module at the current moment;
and subtracting the target output current corresponding to the target photovoltaic charging module at the moment from the charging current requirement of the target device to be charged to obtain the target output current corresponding to the target direct current charging module at the moment.
Preferably, the switching circuit comprises a relay or a MOS transistor or an IGBT transistor or an SCR transistor.
Preferably, the control module is specifically configured to:
preferentially distributing respective corresponding target output currents for the target photovoltaic charging modules according to the charging current requirements of the target equipment to be charged, and distributing respective corresponding target output currents for the target direct current charging modules if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed until the charging current requirements of the target equipment to be charged are met.
In order to solve the above technical problem, the present invention further provides a charging method applied to any one of the above charging devices, including:
according to the charging current requirement of target equipment to be charged, distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged and distributing respective corresponding target output currents according to a preset current distribution strategy;
according to the target photovoltaic charging module, the target direct current charging module and the corresponding target output currents, on-off of a switch circuit on a charging circuit between the photovoltaic charging module and the direct current charging module and among a plurality of devices to be charged is controlled, so that the target photovoltaic charging module and the target direct current charging module are communicated with the devices to be charged, and the target photovoltaic charging module and the target direct current charging module output the target output currents to jointly provide the required electric energy for the devices to be charged.
Preferably, the process of allocating a target photovoltaic charging module and a target dc charging module to a target device to be charged according to a charging current requirement of the target device to be charged and allocating respective corresponding target output currents according to a preset current allocation strategy includes:
preferentially distributing respective corresponding target output currents to the target photovoltaic charging modules according to the charging current requirements of target equipment to be charged;
and if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed, distributing the corresponding target output currents for the target direct current charging modules until the charging current requirements of the target equipment to be charged are met.
In order to solve the technical problem, the invention also provides a charging system which comprises the photovoltaic module and any one of the charging devices.
The invention provides a charging device, which is applied to a charging system adopting a photovoltaic assembly and power grid combined power supply. The control module is used for distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged according to the charging current requirement of the target equipment to be charged, distributing respective corresponding target output currents according to a preset current distribution strategy, and generating a control instruction according to the target photovoltaic charging module, the target direct current charging module and the respective corresponding target output currents; the power distribution module is used for controlling the on-off of a switch circuit on a charging line between the photovoltaic charging module and the direct current charging module and among the plurality of devices to be charged according to a control instruction received from the control module so as to communicate the target photovoltaic charging module and the target direct current charging module with the target devices to be charged, so that the target photovoltaic charging module and the target direct current charging module output target output currents to jointly provide the required electric energy for the target devices to be charged.
It can be seen that the charging energy source of this application comes from photovoltaic module and electric wire netting, and sets up that photovoltaic module and electric wire netting provide the charging current of waiting to charge equipment controllable to realize: according to the charging current requirement of the equipment to be charged, the charging current provided by the photovoltaic module and the power grid to the equipment to be charged is reasonably regulated and controlled, so that the required electric energy is provided for the equipment to be charged.
The invention also provides a charging method and a charging system, which have the same beneficial effects as the charging device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging device according to an embodiment of the present invention;
fig. 2 is a general input characteristic curve diagram of a photovoltaic charging module and a dc charging module according to an embodiment of the present invention;
fig. 3 is a flowchart of a charging method according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a charging device, a method and a system, wherein charging energy is from a photovoltaic module and a power grid, and charging current provided by the photovoltaic module and the power grid to a device to be charged is controllable, so as to realize that: according to the charging current requirement of the equipment to be charged, the charging current provided by the photovoltaic module and the power grid to the equipment to be charged is reasonably regulated and controlled, so that the required electric energy is provided for the equipment to be charged.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a charging device according to an embodiment of the present invention.
This charging device is applied to the charging system who adopts photovoltaic module and electric wire netting combination power supply, includes:
the photovoltaic charging module 100 is used for performing DC/DC conversion on the direct current output by the photovoltaic module;
the direct current charging module 200 is used for performing AC/DC conversion on alternating current output by a power grid;
the control module 300 is configured to allocate a target photovoltaic charging module and a target dc charging module to a target device to be charged according to a charging current demand of the target device to be charged, allocate respective corresponding target output currents according to a preset current allocation strategy, and generate a control instruction according to the target photovoltaic charging module and the target dc charging module and the respective corresponding target output currents;
and the power distribution module 400 is configured to control, according to a control instruction received from the control module 300, on/off of a switch circuit on a charging line between the photovoltaic charging module 100 and the dc charging module 200 and the multiple devices to be charged, so as to connect the target photovoltaic charging module and the target dc charging module with the target devices to be charged, so that the target photovoltaic charging module and the target dc charging module output target output currents to jointly provide the target devices to be charged with electric energy required by the target devices to be charged.
Specifically, the charging device of the present application includes a photovoltaic charging module 100, a dc charging module 200, a Control module 300 (such as a CCU (charge Control Unit)) and a Power Distribution module 400 (such as a PDU (Power Distribution Unit)), and its working principle is as follows:
the photovoltaic module absorbs solar energy and converts the solar energy into direct current to be output to the photovoltaic charging module 100. The number of the photovoltaic charging modules 100 may be one, or may be multiple, and each photovoltaic charging module 100 is configured to, in operation, perform DC/DC (direct current/direct current) conversion on a direct current output by a photovoltaic module to output a direct current for charging a device to be charged.
The grid is connected to the dc charging module 200 to output the ac power output by the grid to the dc charging module 200. The number of the DC charging modules 200 may be one, or may be multiple, and each DC charging module 200 is configured to, when in operation, perform AC/DC (alternating current/direct current) conversion on an alternating current output by a power grid to output a direct current for charging a device to be charged.
The number of the devices to be charged may be one or more, and for any one device to be charged (referred to as a target device to be charged), the control module 300 performs the following control operations: according to the charging current requirement of the target equipment to be charged, a target photovoltaic charging module and a target direct current charging module are distributed to the target equipment to be charged from the photovoltaic charging module 100 and the direct current charging module 200 of the charging device, respectively corresponding target output currents are distributed to the target photovoltaic charging module and the target direct current charging module according to a preset current distribution strategy, then control instructions are generated according to the target photovoltaic charging module, the target direct current charging module and the respectively corresponding target output currents, and the control instructions are sent to the power distribution module 400.
The power distribution module 400 controls the on/off of the switch circuits on the charging lines between the photovoltaic charging module 100 and the dc charging module 200 of the charging device and the multiple devices to be charged according to the control instruction received from the control module 300, so as to connect the target photovoltaic charging module and the target dc charging module with the target devices to be charged, and thus the target photovoltaic charging module and the target dc charging module output the target output current to provide the electric energy required by the target devices to be charged together.
The number of the photovoltaic charging modules 100 and the number of the dc charging modules 200 in the charging device are set according to actual situations, and the present application is not limited thereto.
It can be seen that the charging energy source of this application comes from photovoltaic module and electric wire netting, and sets up that photovoltaic module and electric wire netting provide the charging current of waiting to charge equipment controllable to realize: according to the charging current requirement of the equipment to be charged, the charging current provided by the photovoltaic module and the power grid to the equipment to be charged is reasonably regulated and controlled, so that the required electric energy is provided for the equipment to be charged.
On the basis of the above-described embodiment:
as an alternative embodiment, the control module 300 executes the preset current distribution strategy in the power distribution module 400 to generate the control instruction.
Specifically, the control module 300 allocates a target photovoltaic charging module and a target dc charging module to the target device to be charged according to the charging current requirement of the target device to be charged, then allocates corresponding target output currents to the target photovoltaic charging module and the target dc charging module by the power allocation module 400 according to a preset current allocation strategy, and the control module 300 generates a control command according to the target photovoltaic charging module, the target dc charging module and the corresponding target output currents.
As an alternative embodiment, the preset current distribution policy is:
taking the maximum output current of the target photovoltaic charging module as the target output current corresponding to the target photovoltaic charging module;
and subtracting the maximum output current from the charging current requirement of the target equipment to be charged to obtain the target output current corresponding to the target direct current charging module.
Specifically, as shown in fig. 2, fig. 2 is a general input characteristic curve diagram of a photovoltaic charging module and a dc charging module according to an embodiment of the present invention, and if the photovoltaic utilization rate in the system is high, an MPPT (Maximum Power Point Tracking) function needs to be added into the system for Tracking.
More specifically, one way to add MPPT functionality to the system is: the output current value of the photovoltaic charging module is fixed and is always output at the maximum current, so that the photovoltaic charging module always works at the maximum power.
Based on this, the first current distribution strategy (distributing the target photovoltaic charging module and the target dc charging module with their respective corresponding target output currents) is: the power distribution module 400 uses the maximum output current of the target photovoltaic charging module as the target output current corresponding to the target photovoltaic charging module, and then subtracts the maximum output current of the target photovoltaic charging module from the charging current demand of the target device to be charged to obtain the remaining output current, which is the target output current corresponding to the target dc charging module. Specifically, the way for the power distribution module 400 to obtain the maximum output current of the target photovoltaic charging module may be: the target photovoltaic charging module uploads its maximum output current to the power distribution module 400.
For example, the target: and if the charging current requirement of the target equipment to be charged is 50A, the sum of the output current of the target photovoltaic charging module and the output current of the target direct current charging module is 50A.
The target photovoltaic charging module specifies a maximum output current of 40A, i.e., the current uploaded by the target photovoltaic charging module to the power distribution module 400 is 40A, then the power distribution module 400 distributes: the target photovoltaic charging module is 40A output, and the target direct current charging module is 10A output.
As an alternative embodiment, the target photovoltaic charging module is further configured to:
uploading the input voltage, the input current, the output voltage and the output current of the power distribution module 400 at different times;
accordingly, the power distribution module 400 is specifically configured to:
according to the input voltage, the input current, the output voltage and the output current which are uploaded by the target photovoltaic charging module at the previous moment, the input power and the output power which correspond to the target photovoltaic charging module at the previous moment are obtained;
when the output power corresponding to the previous moment is smaller than the input power, increasing the output current uploaded by the target photovoltaic charging module at the previous moment by a preset multiple to obtain the target output current corresponding to the target photovoltaic charging module at the current moment;
subtracting a target output current corresponding to the target photovoltaic charging module at the moment from the charging current requirement of the target device to be charged to obtain a target output current corresponding to the target direct current charging module at the moment;
judging whether the output power corresponding to the target photovoltaic charging module at the moment reaches the maximum output power of the target photovoltaic charging module; if not, returning to the step of calculating the input power and the output power corresponding to the target photovoltaic charging module at the last moment according to the input voltage, the input current, the output voltage and the output current uploaded by the target photovoltaic charging module at the last moment; and if so, stopping adjusting the target output current corresponding to the target photovoltaic charging module.
Specifically, another way of adding the MPPT function to the system is: the output current of the photovoltaic charging module and the output current of the direct current charging module are adjusted in real time, so that the total output current of the system meets the requirement of a stable state.
Based on this, the second current distribution strategy (distributing the target photovoltaic charging module and the target dc charging module with their respective corresponding target output currents) is: the target photovoltaic charging module uploads to the power distribution module 400 the input voltage, input current, output voltage and output current itself at different times. The power distribution module 400 calculates the input power corresponding to the target photovoltaic charging module at the previous time according to the input voltage and the input current uploaded by the target photovoltaic charging module at the previous time, and calculates the output power corresponding to the target photovoltaic charging module at the previous time according to the output voltage and the output current uploaded by the target photovoltaic charging module at the previous time. When the output power corresponding to the previous moment is smaller than the input power, it is indicated that the target photovoltaic charging module does not work at the maximum power point at the previous moment, the power distribution module 400 increases the output current uploaded by the target photovoltaic charging module at the previous moment by a predetermined multiple (for example, 1.1 times) to obtain an increased output current, and uses the increased output current as the target output current corresponding to the target photovoltaic charging module at the current moment, and then subtracts the target output current corresponding to the target photovoltaic charging module from the charging current demand of the target device to be charged to obtain the target output current corresponding to the target direct current charging module at the current moment. Next, the power distribution module 400 determines whether the output power of the target photovoltaic charging module at this time reaches the maximum output power of the target photovoltaic charging module; if the maximum output power of the target photovoltaic charging module is not reached, returning to the step of calculating the input power and the output power corresponding to the target photovoltaic charging module at the last moment according to the input voltage, the input current, the output voltage and the output current uploaded by the target photovoltaic charging module at the last moment; and if the maximum output power of the target photovoltaic charging module is reached, stopping adjusting the target output current corresponding to the target photovoltaic charging module.
For example, the target: and if the charging current requirement of the target equipment to be charged is 50A, the sum of the output current of the target photovoltaic charging module and the output current of the target direct current charging module is 50A.
Assuming that the output voltage of the target photovoltaic charging module at the previous moment is 200V, the output current is 20A, the input voltage is 500V, and the input current is 10A, that is, the input power of the target photovoltaic charging module at the previous moment is 5kW, the output power is 4kW, the target photovoltaic charging module does not work at the maximum power point at the previous moment, the power distribution module 400 obtains the voltage and current value of the target photovoltaic charging module, and after determining that the target photovoltaic charging module does not work at the maximum power point, the target output current issued by the power distribution module 400 to the target photovoltaic charging module at the current moment is: the current (22A) obtained by multiplying the current uploaded by the target photovoltaic charging module by 1.1 at the last moment, the target output current delivered to the target dc charging module at this time is 28A, the total output current of the two at this time is stabilized to 50A, after the charging module tracks the target output current delivered by the power distribution module 400 at this time, the power distribution module 400 starts to estimate whether the target pv charging module is working at the maximum power point (determined by the voltage and current uploaded by the target pv charging module) at this time, and if the target pv charging module is not working at the maximum power point, the power distribution module 400 starts to estimate the target output current issued to the charging module again, keeps the total output current of the target output current and the charging module unchanged, and dynamically adjusts the output current value of the target photovoltaic charging module until the output power of the target photovoltaic charging module reaches the maximum output power of the target photovoltaic charging module.
As an alternative embodiment, the target photovoltaic charging module is further configured to:
increasing the output current of the power distribution module 400 by a preset multiple at the previous moment, and uploading the increased output current value to the power distribution module 400;
judging whether the output power corresponding to the increased output current value reaches the maximum output power of the output power; if not, returning to execute the step of increasing the output current of the current transformer by a preset multiple at the previous moment; if so, stopping increasing the output current of the converter;
accordingly, the power distribution module 400 is specifically configured to:
receiving the increased output current value uploaded by the target photovoltaic charging module at the previous moment, and taking the increased output current value uploaded at the previous moment as the target output current corresponding to the target photovoltaic charging module at the current moment;
and subtracting the target output current corresponding to the target photovoltaic charging module at the moment from the charging current requirement of the target device to be charged to obtain the target output current corresponding to the target direct current charging module at the moment.
Specifically, in addition to the target output current of the target photovoltaic charging module calculated by the power distribution module 400 in the above embodiment, the target photovoltaic charging module may also calculate its own target output current by itself, in which case the variables are simple, and the target photovoltaic charging module only needs to upload the calculated target output current to the power distribution module 400.
Based on this, the third current distribution strategy (distributing the target output current for each of the target photovoltaic charging module and the target dc charging module) is: the target photovoltaic charging module increases the output current of the target photovoltaic charging module by a preset multiple at the previous moment, uploads the increased output current value to the power distribution module 400, and then judges whether the output power corresponding to the increased output current value reaches the maximum output power of the target photovoltaic charging module; if the output power does not reach the maximum output power of the self-power-saving control circuit, returning to execute the step of increasing the output current of the self-power-saving control circuit at the last moment by a preset multiple; and stopping increasing the output current of the power converter if the maximum output power of the power converter reaches the maximum output power of the power converter. After receiving the increased output current value uploaded by the target photovoltaic charging module at the previous time, the power distribution module 400 uses the increased output current value uploaded at the previous time as the target output current corresponding to the target photovoltaic charging module at the current time, and then subtracts the target output current corresponding to the target photovoltaic charging module from the charging current demand of the target device to be charged to obtain the target output current corresponding to the target direct current charging module at the current time.
For example, the target: and if the charging current requirement of the target equipment to be charged is 50A, the sum of the output current of the target photovoltaic charging module and the output current of the target direct current charging module is 50A.
Assuming that the illumination is not strong, the energy provided by the photovoltaic module is small, so that the output current value corresponding to the maximum power point tracked by the target photovoltaic charging module at the previous time is 5A, then the target output current uploaded to the power distribution module 400 by the target photovoltaic charging module is 5.5A (a relationship of 1.1 times is specified), then the working current value re-issued to the target photovoltaic charging module by the power distribution module 400 at this time is 5.5A, for the system, the target output current of the target photovoltaic charging module at this time is 5.5A, then the target output current of the target dc charging module at this time is 50A-5.5A-44.5A, and the total output current of the two is 50A. Assuming that the illumination is strong enough and the energy provided by the photovoltaic module is large, so that the output current value corresponding to the maximum power point tracked by the target photovoltaic charging module at the previous time is 20A, then the target output current uploaded to the power distribution module 400 by the target photovoltaic charging module at this time is 22A, the working current value re-issued to the target photovoltaic charging module by the power distribution module 400 at this time is 22A, for the system, the target output current of the target photovoltaic charging module at this time is 22A, then the target output current of the target dc charging module at this time is 28A, and the total output current of the target photovoltaic charging module and the target dc charging module at this time is stabilized at 50A. When the target photovoltaic charging module tracks that the output current value corresponding to the maximum power point is 22A at the moment, the target output current corresponding to the moment is estimated again: 1.1 × 22A ═ 24.2A, and uploaded to the power distribution module 400. And analogizing in sequence until the output power corresponding to the output current value estimated to be increased by the target photovoltaic charging module reaches the maximum output power of the target photovoltaic charging module.
As an alternative embodiment, the switching circuit includes a relay or a MOS transistor or an IGBT transistor or an SCR transistor.
Specifically, each switch in the switch circuit of the present application may be a relay, an MOS (Metal-Oxide-Semiconductor) Transistor, an IGBT (Insulated Gate Bipolar Transistor), or an SCR (thyristor), which is not limited herein.
As an alternative embodiment, the control module 300 is specifically configured to:
preferentially distributing respective corresponding target output currents for the target photovoltaic charging modules according to the charging current requirements of the target equipment to be charged, and distributing the respective corresponding target output currents for the target direct current charging modules if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed until the charging current requirements of the target equipment to be charged are met.
Specifically, for the current distribution strategy (the target photovoltaic charging modules and the target direct current charging modules are distributed with respective corresponding target output currents), the distribution priority of the target photovoltaic charging modules is greater than the distribution priority of the target direct current charging modules, that is, the target photovoltaic charging modules are preferentially distributed with respective corresponding target output currents, if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed, the target direct current charging modules are distributed with respective corresponding target output currents until the charging current requirements of the target equipment to be charged are met, so that the operation cost of the charging station is reduced as much as possible.
Referring to fig. 3, fig. 3 is a flowchart of a charging method according to an embodiment of the present invention.
The charging method is applied to any one of the charging devices, and comprises the following steps:
step S1: according to the charging current requirement of the target equipment to be charged, distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged and distributing respective corresponding target output currents according to a preset current distribution strategy.
Step S2: according to the target photovoltaic charging module, the target direct current charging module and the corresponding target output currents, on-off of a switch circuit on a charging line between the photovoltaic charging module and the direct current charging module and among the plurality of devices to be charged is controlled, so that the target photovoltaic charging module and the target direct current charging module are communicated with the target devices to be charged, and the target photovoltaic charging module and the target direct current charging module output the target output currents to provide the required electric energy for the target devices to be charged together.
As an optional embodiment, the process of allocating a target photovoltaic charging module and a target dc charging module to a target device to be charged according to a charging current requirement of the target device to be charged and allocating respective corresponding target output currents according to a preset current allocation policy includes:
preferentially distributing respective corresponding target output currents to the target photovoltaic charging modules according to the charging current requirements of the target equipment to be charged;
and if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed, distributing the corresponding target output currents for the target direct current charging modules until the charging current requirements of the target equipment to be charged are met.
For introduction of the charging method provided in the present application, reference is made to the embodiments of the charging device described above, and details of the charging method are not repeated herein.
The application also provides a charging system which comprises the photovoltaic module and any one of the charging devices.
For introduction of the charging system provided in the present application, reference is made to the embodiments of the charging device described above, and details of the charging system are not repeated herein.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A charging device is applied to a charging system which adopts a combination of a photovoltaic module and a power grid for power supply, and comprises:
the photovoltaic charging module is used for carrying out DC/DC conversion on the direct current output by the photovoltaic module;
the direct current charging module is used for performing AC/DC conversion on alternating current output by the power grid;
the control module is used for distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged according to the charging current requirement of the target equipment to be charged, distributing respective corresponding target output currents according to a preset current distribution strategy, and generating a control instruction according to the target photovoltaic charging module, the target direct current charging module and the respective corresponding target output currents;
and the power distribution module is used for controlling the on-off of a switch circuit on a charging circuit between the photovoltaic charging module and the direct current charging module and among a plurality of devices to be charged according to a control instruction received from the control module so as to communicate the target photovoltaic charging module and the target direct current charging module with the target devices to be charged, so that the target photovoltaic charging module and the target direct current charging module output target output current to jointly provide the required electric energy for the target devices to be charged.
2. The charging apparatus of claim 1, wherein the control module executes the preset current allocation strategy in the power allocation module to generate a control command.
3. A charging arrangement as claimed in claim 2, in which the predetermined current distribution strategy is:
taking the maximum output current of the target photovoltaic charging module as the target output current corresponding to the target photovoltaic charging module;
and subtracting the maximum output current from the charging current requirement of the target equipment to be charged to obtain the target output current corresponding to the target direct current charging module.
4. The charging apparatus of claim 2, wherein the target photovoltaic charging module is further configured to:
uploading the input voltage, the input current, the output voltage and the output current of the power distribution module at different moments;
correspondingly, the power distribution module is specifically configured to:
according to the input voltage, the input current, the output voltage and the output current which are uploaded by the target photovoltaic charging module at the previous moment, the input power and the output power which correspond to the target photovoltaic charging module at the previous moment are obtained;
when the output power corresponding to the previous moment is smaller than the input power, increasing the output current uploaded by the target photovoltaic charging module at the previous moment by a preset multiple to obtain the target output current corresponding to the target photovoltaic charging module at the current moment;
subtracting a target output current corresponding to the target photovoltaic charging module at the current moment from the charging current requirement of the target device to be charged to obtain a target output current corresponding to the target direct current charging module at the current moment;
judging whether the output power corresponding to the target photovoltaic charging module at the moment reaches the maximum output power of the target photovoltaic charging module; if not, returning to the step of calculating the input power and the output power corresponding to the target photovoltaic charging module at the last moment according to the input voltage, the input current, the output voltage and the output current uploaded by the target photovoltaic charging module at the last moment; and if so, stopping adjusting the target output current corresponding to the target photovoltaic charging module.
5. The charging apparatus of claim 2, wherein the target photovoltaic charging module is further configured to:
increasing the output current of the power distribution module at the previous moment by a preset multiple, and uploading the increased output current value to the power distribution module;
judging whether the output power corresponding to the increased output current value reaches the maximum output power of the output power; if not, returning to execute the step of increasing the output current of the current transformer by a preset multiple at the previous moment; if so, stopping increasing the output current of the converter;
correspondingly, the power distribution module is specifically configured to:
receiving the increased output current value uploaded by the target photovoltaic charging module at the previous moment, and taking the increased output current value uploaded at the previous moment as the target output current corresponding to the target photovoltaic charging module at the current moment;
and subtracting the target output current corresponding to the target photovoltaic charging module at the moment from the charging current requirement of the target device to be charged to obtain the target output current corresponding to the target direct current charging module at the moment.
6. The charging device of claim 1, wherein the switching circuit comprises a relay or a MOS transistor or an IGBT transistor or an SCR transistor.
7. The charging device according to any one of claims 1 to 6, wherein the control module is specifically configured to:
preferentially distributing respective corresponding target output currents for the target photovoltaic charging modules according to the charging current requirements of the target equipment to be charged, and distributing respective corresponding target output currents for the target direct current charging modules if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed until the charging current requirements of the target equipment to be charged are met.
8. A charging method applied to the charging device according to any one of claims 1 to 7, comprising:
according to the charging current requirement of target equipment to be charged, distributing a target photovoltaic charging module and a target direct current charging module for the target equipment to be charged and distributing respective corresponding target output currents according to a preset current distribution strategy;
according to the target photovoltaic charging module, the target direct current charging module and the corresponding target output currents, on-off of a switch circuit on a charging circuit between the photovoltaic charging module and the direct current charging module and among a plurality of devices to be charged is controlled, so that the target photovoltaic charging module and the target direct current charging module are communicated with the devices to be charged, and the target photovoltaic charging module and the target direct current charging module output the target output currents to jointly provide the required electric energy for the devices to be charged.
9. The charging method according to claim 8, wherein the process of allocating a target photovoltaic charging module and a target dc charging module to a target device to be charged according to a charging current requirement of the target device to be charged and allocating respective corresponding target output currents according to a preset current allocation strategy comprises:
preferentially distributing respective corresponding target output currents to the target photovoltaic charging modules according to the charging current requirements of target equipment to be charged;
and if the charging current requirements of the target equipment to be charged are not met after all the target photovoltaic charging modules are distributed, distributing the corresponding target output currents for the target direct current charging modules until the charging current requirements of the target equipment to be charged are met.
10. An electrical charging system comprising a photovoltaic module and a charging device as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753661.1A CN113291173A (en) | 2021-07-02 | 2021-07-02 | Charging device, method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753661.1A CN113291173A (en) | 2021-07-02 | 2021-07-02 | Charging device, method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113291173A true CN113291173A (en) | 2021-08-24 |
Family
ID=77330396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110753661.1A Pending CN113291173A (en) | 2021-07-02 | 2021-07-02 | Charging device, method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113291173A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066677A (en) * | 2013-02-04 | 2013-04-24 | 广州市竣达智能软件技术有限公司 | Self-adaptive hybrid power supply system |
| CN103176500A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Maximum power tracking method for solar cell |
| US20190089163A1 (en) * | 2016-04-20 | 2019-03-21 | Concept By Us Corporation | A photovoltaic sources power station with integrated batterycharge/discharge cycle |
| CN111497670A (en) * | 2020-04-29 | 2020-08-07 | 西安特锐德智能充电科技有限公司 | Charging device, system and method |
| CN212323751U (en) * | 2020-03-13 | 2021-01-08 | 南方电网电动汽车服务有限公司 | Power distribution device and charging system |
-
2021
- 2021-07-02 CN CN202110753661.1A patent/CN113291173A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176500A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Maximum power tracking method for solar cell |
| CN103066677A (en) * | 2013-02-04 | 2013-04-24 | 广州市竣达智能软件技术有限公司 | Self-adaptive hybrid power supply system |
| US20190089163A1 (en) * | 2016-04-20 | 2019-03-21 | Concept By Us Corporation | A photovoltaic sources power station with integrated batterycharge/discharge cycle |
| CN212323751U (en) * | 2020-03-13 | 2021-01-08 | 南方电网电动汽车服务有限公司 | Power distribution device and charging system |
| CN111497670A (en) * | 2020-04-29 | 2020-08-07 | 西安特锐德智能充电科技有限公司 | Charging device, system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tran et al. | Mitigation of solar PV intermittency using ramp-rate control of energy buffer unit | |
| RU2670417C1 (en) | Power conversion system | |
| JP5290349B2 (en) | DC power supply system and control method thereof | |
| CN114204901B (en) | Photovoltaic system, inverter and bus voltage control method of inverter | |
| CN104467148A (en) | Power supply control circuit, method and device | |
| CN108695983B (en) | Distributed photovoltaic power station energy management system and method | |
| Nasir et al. | Solar photovoltaic integrated building scale hybrid AC/DC microgrid | |
| CN110768235A (en) | Control method of direct-current microgrid multi-mode bidirectional DC-DC converter | |
| JP3567944B2 (en) | Power converter for photovoltaic power generation | |
| Verma et al. | CAPSA based control for power quality correction in PV array integrated EVCS operating in standalone and grid connected modes | |
| CN114726044A (en) | Power module, charging pile and power supply equipment | |
| CN105978031A (en) | Method and system for conducting active and reactive coordinated control on photovoltaic device | |
| KR101764651B1 (en) | Power applying apparatus and method for controlling connecting photovoltaic power generating apparatus | |
| Pichetjamroen et al. | Effect of flexible power control on batteries requirement and performance in PV power system | |
| CN113291173A (en) | Charging device, method and system | |
| EP2733813B1 (en) | Control device for hybrid electric power system | |
| KR101382946B1 (en) | Photovoltaic power generation system and control method thereof | |
| US10886744B2 (en) | Power conversion system, power supply system and power conversion device | |
| CN112003313B (en) | Power adjusting method and device and charging equipment | |
| CN117693892A (en) | Power conversion device, control method and power supply system | |
| KR20220069832A (en) | Method and apparatus for directly charging an electric vehicle at a dc current source | |
| JP2021058034A (en) | Power control device and power control method, and power supply equipment | |
| EP3640175A1 (en) | Decentralized power management in an elevator system | |
| CN110854920A (en) | Photovoltaic power generation parallel controller device | |
| CN114447993B (en) | Power control method, device, controller and optical storage system |
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: E206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Address before: E206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210824 |