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CN116914875A - A charging and discharging method and control terminal after expansion of optical storage and charging system - Google Patents

A charging and discharging method and control terminal after expansion of optical storage and charging system Download PDF

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Publication number
CN116914875A
CN116914875A CN202310661406.3A CN202310661406A CN116914875A CN 116914875 A CN116914875 A CN 116914875A CN 202310661406 A CN202310661406 A CN 202310661406A CN 116914875 A CN116914875 A CN 116914875A
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CN
China
Prior art keywords
power
charging
optical storage
battery
converter
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
Application number
CN202310661406.3A
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Chinese (zh)
Inventor
廖敏星
方焱琦
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Fujian Times Nebula Technology Co Ltd
Original Assignee
Fujian Times Nebula Technology Co Ltd
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Priority to CN202310661406.3A priority Critical patent/CN116914875A/en
Publication of CN116914875A publication Critical patent/CN116914875A/en
Pending legal-status Critical Current

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Classifications

    • H02J7/50—
    • 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
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/53—Batteries
    • 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
    • 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
    • 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
    • B60L53/63—Monitoring or controlling charging stations in response to network capacity
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • H02J7/855—
    • H02J7/865—
    • H02J2101/24—
    • 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

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  • 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 charge and discharge method and a control terminal after capacity expansion of an optical storage and charge system, which are used for coordinating the charge and discharge flow of an external power grid, a battery system and a photovoltaic system by collecting the transmission power of each module of the optical storage and charge system, accurately controlling the charge and discharge of each group of battery systems after capacity expansion in turn, avoiding the need of additionally configuring a whole set of power distribution equipment for the battery systems after capacity expansion and reducing the economic cost; meanwhile, as the capacity of the battery system is increased, the pressure on the power grid side is reduced when power is used, and the power demand is met.

Description

Charging and discharging method after capacity expansion of optical storage and charging system and control terminal
Technical Field
The invention relates to the field of energy storage, in particular to a method for charging and discharging an optical storage and charging system after capacity expansion and a control terminal.
Background
With the rising of new energy industry and the increasing of technology, electric vehicles on the market are more and more, and the power demand of later-stage electric vehicles can be continuously improved, and the service life of an original energy storage system can be prolonged along with the increase of service life, so that the power supply pressure of a power grid is increased. Therefore, in order to lighten the side pressure of the power grid and consume new energy, the capacity expansion of the existing optical storage and charging system is very important to meet the charging requirement of the electric automobile.
In the prior art, the longer the service life of the battery energy storage system is, the shorter the service life is, the new battery energy storage system cannot be used with the old battery energy storage system at the same time, the control is difficult after capacity expansion, and the power supply pressure of a power grid is difficult to relieve.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method comprises the steps of collecting transmission power of each module of the optical storage and charging system in real time, scheduling on-off of each module in real time according to the power, and accurately switching the expanded multiple groups of battery systems.
In order to solve the technical problems, the invention adopts the following technical scheme:
the discharging method after the capacity expansion of the optical storage and charging system comprises the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the sum of the transmission power of a certain group of currently discharged battery systems and the transmission power of a photovoltaic system cannot meet the external charging requirement, cutting off the battery systems and controlling an external network to supply power to the outside;
s3, controlling the external output power to be reduced below the power supply of the external network;
s4, switching to any other group of battery systems and disconnecting an external network;
s5, supplying power to the outside by a certain group of the battery system and the photovoltaic system after switching, and returning to the step S1.
In order to solve the technical problems, the invention adopts another technical scheme that:
the charging method after the capacity expansion of the optical storage and charging system comprises the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the fact that the sum of the power supply power of the external network and the power supply power of the photovoltaic system is larger than the external required power is detected, the external network and the photovoltaic system jointly supply power for the direct current converter;
s3, controlling a currently accessed battery system to enter a charging mode;
and S4, when the battery system which is currently connected reaches a full charge state, disconnecting the battery system which is currently connected, and switching to any other group of battery systems.
In order to solve the technical problems, the invention adopts another technical scheme that:
the method comprises the steps of expanding the capacity of an optical storage charging system, and controlling the on-off of any group of battery systems and the optical storage charging system by using the EMS; the terminal controls the operation of the whole system through the EMS, and executes the steps in the discharge method after the capacity expansion of the optical storage and charging system or the charging method after the capacity expansion of the optical storage and charging system.
The invention has the beneficial effects that: the method comprises the steps of providing a charging and discharging method and a control terminal after capacity expansion of an optical storage and charging system, coordinating an external power grid, a battery system and a charging and discharging flow of a photovoltaic system by collecting transmission power of each module of the optical storage and charging system, accurately controlling charging and discharging of each group of battery systems after capacity expansion in turn, and reducing economic cost without additionally configuring a whole set of power distribution equipment for the battery systems after capacity expansion; meanwhile, as the capacity of the battery system is increased, the pressure on the power grid side is reduced when power is used, and the power demand is met.
Drawings
FIG. 1 is a flow chart of a method for discharging an expanded optical storage and filling system according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for expanding capacity of an optical storage and charging system according to an embodiment of the invention;
FIG. 3 is a specific flow chart of a method for expanding capacity of an optical storage and charging system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a charge-discharge terminal after expansion of an optical storage and charge system according to an embodiment of the present invention;
fig. 5 is a diagram of an implementation apparatus of a charge-discharge method after expansion of an optical storage and charge system according to an embodiment of the present invention.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 3, a discharge method after capacity expansion of an optical storage and charging system is characterized in that: the method comprises the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the sum of the transmission power of a certain group of currently discharged battery systems and the transmission power of a photovoltaic system cannot meet the external charging requirement, cutting off the battery systems and controlling an external network to supply power to the outside;
s3, controlling the external output power to be reduced below the power supply of the external network;
s4, switching to any other group of battery systems and disconnecting an external network;
s5, supplying power to the outside by a certain group of the battery system and the photovoltaic system after switching, and returning to the step S1.
As can be seen from the above description, since the new and old battery systems after expansion cannot be used simultaneously, a discharging method after expansion of the optical storage and charging system is provided, and each group of battery systems is coordinately controlled to discharge, so that a whole set of power distribution equipment is not required to be additionally arranged for the newly added battery systems, and the cost is reduced; meanwhile, as the capacity of the battery system is increased, the pressure on the power grid side is reduced when power is used, and the power demand is met.
The working principle is as follows: if the power supply is in the local peak power time, the photovoltaic system and the battery system are preferentially considered to supply power to the outside, and in one embodiment of the invention, the external power supply requirement is the power consumption requirement on a charging pile in the charging station; when the sum of the transmission power of a certain group of currently discharged battery systems and the generation power of the photovoltaic system cannot meet the external power supply requirement, the external network temporarily supplies power to the outside for ensuring the stable power supply, and meanwhile, the battery systems are prepared for switching; firstly, controlling the external output power to be reduced below the power supplied by an external network, so as to ensure that the power supply module is not damaged; then, switching of the battery system is performed; and after the switching is finished, finally, disconnecting the external network, and continuing to supply power for external requirements by using the battery system and the photovoltaic system.
Further, the step S2 and the step S3 specifically include:
s2: when P is detected x +P pv ≤P DCDC When the battery system is cut off, the external network is controlled to supply power to the outside;
s3: control P DCDC <P pcs ；
Wherein P is x The transmission power of a certain group of battery systems which are discharged currently after capacity expansion in the optical storage and charge system is used;
P pv the current transmission power of the photovoltaic system in the optical storage and filling system is set;
P DCDC the current transmission power of the direct current converter in the optical storage and filling system is;
P pcs the rated transmission power of the energy storage converter in the optical storage and charging system is used.
As can be seen from the above description, the external output power is controlled by the DCDC component (i.e. the dc converter), and the external network transmission power is controlled by the PCS (i.e. the energy storage converter).
Further, the step S5 specifically includes:
s51, when P is detected x +P pv ＞P DCDC At this time, the process advances to step S52; otherwise, step S53 is entered;
s52, supplying power to the direct current converter by a certain group of currently discharged battery systems and photovoltaic systems, and returning to the step S1;
s53, switching to any other battery system which is not switched, and entering the next step;
s54, when P is detected x +P pv ≤P DCDC And returning to step S53 when there is still an unswitched battery pack; when P is detected x +P pv ＞P DCDC When it is time, the process returns to step S52;when P is detected y +P pv ≤P DCDC When the method is used, the next step is carried out; p (P) y The transmission power of any group of battery systems after capacity expansion in the optical storage and charging system is used;
s55, controlling the currently output battery system to continue to supply power;
and S56, when the battery system which is currently output reaches the full-discharge state, switching to discharge other battery systems until all the battery systems reach the full-discharge state.
As can be seen from the above description, when the sum of the transmission power of the battery system (i.e. the currently discharged battery system of a certain group) and the transmission power of the photovoltaic system after switching can meet the external required power, the current discharged battery system of a certain group and the photovoltaic system supply power to the dc converter; otherwise, the battery system is continuously switched until a certain group of battery systems capable of meeting the external required power is found. Meanwhile, if the sum of the transmission power of any group of battery systems and the transmission power of the photovoltaic system cannot meet the external required power, the current discharged group of battery systems is discharged without switching; and after the battery system of the group reaches the full-discharge state, switching another battery system of the group to discharge until all the battery systems reach the full-discharge state. The principle of the method is that in the peak electricity stage, a certain group of battery systems which can meet external requirements are discharged preferentially, and if all the battery systems cannot meet the external power requirements, any battery system is selected to be fully discharged until the electric quantity of all the battery systems is used up; in the process, the external required power can be reduced, so that the situation that the gap between the external required power and the sum of the transmission power of the battery system and the transmission power of the photovoltaic system is too large and equipment is damaged is avoided.
Further, step S6 is further included after step S5, where step S6 specifically includes:
s61, when all the battery systems are detected to be in a full-discharge state after the capacity expansion of the optical storage and charging system is detected, all the battery systems are disconnected;
and S62, controlling all battery systems to be in a static state, and switching to the energy storage converter and the photovoltaic system to supply power for the direct current converter.
As can be seen from the above description, the electricity stored in the battery system is preferably used in the discharging stage, and then the electricity is largely connected to the power grid, so as to save the electricity cost in the peak electricity stage.
Further, the step S2 specifically includes:
s21, when P is detected x +P pv ≤P DCDC When the current discharging battery system is started, predicting the residual available electric quantity of the current discharging battery system according to the historical data;
s22, predicting the power generation capacity of the photovoltaic system within a preset time according to weather data;
s23, calculating the sum of the residual available electric quantity of the battery system currently discharged in the preset time and the generated energy of the photovoltaic system, and if the sum of the residual available electric quantity of the battery system currently discharged in the preset time and the generated energy of the photovoltaic system is greater than or equal to the minimum required electric quantity of the direct current converter, continuing to supply power by the battery system currently discharged; otherwise, cutting off the battery system and controlling the external network to supply power to the outside, and entering the next step.
As can be seen from the above description, in order to optimize the allocation manner of the remaining power of the battery system, simplify the allocation flow, when it is predicted that the sum of the remaining available power of a certain group of battery systems currently discharged within a preset time and the power generation amount of the photovoltaic system can meet the sum of the power supply amounts required by the outside within the preset time, the battery system is not required to be switched, and the battery system is continuously supplied with power, and if the requirements cannot be met, the battery system is continuously switched.
Further, the calculation formula of the minimum required electric quantity of the direct current converter is as follows:
wherein P is DCDC min The minimum required electric quantity of the direct current converter is obtained;
I i connecting a charging current of a certain vehicle to a direct current converter;
U i connecting a DC converter to the charging of a vehicleA voltage;
n is the total number of charged vehicles of the current light storage charging system.
As can be seen from the above description, the minimum required power is calculated according to the sum of actual external power requirements; preferably, the external demand is a charging vehicle with a charging pile, and in one embodiment of the present invention, the range of the minimum required electric quantity is 0.8-1 times of the rated power of the dc converter.
Referring to fig. 2 and 3, a charging method after capacity expansion of an optical storage and charging system includes the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the fact that the sum of the power supply power of the external network and the power supply power of the photovoltaic system is larger than the external required power is detected, the external network and the photovoltaic system jointly supply power for the direct current converter;
s3, controlling a currently accessed battery system to enter a charging mode;
and S4, when the battery system which is currently connected reaches a full charge state, disconnecting the battery system which is currently connected, and switching to any other group of battery systems.
As can be seen from the above description, since the new and old battery systems after expansion cannot be used simultaneously, the method for charging the optical storage and charging system after expansion is provided, and each group of battery systems is cooperatively controlled to discharge, so that a whole set of power distribution equipment is not required to be additionally arranged for the newly added battery systems, and the cost is reduced; meanwhile, as the capacity of the battery system is increased, the pressure on the power grid side is reduced when power is used, and the power demand is met.
The working principle is as follows: if the photovoltaic system and the external network are in the local valley time, the photovoltaic system and the external network are preferentially considered to supply power to the outside, and in one embodiment of the invention, the external power supply requirement is the power consumption requirement on a charging pile in the charging station; when the sum of the transmission power of the current external network and the generated power of the photovoltaic system is found to be larger than the external power supply requirement, the extra power is utilized to charge a certain group of battery systems, and when the fact that the certain group of battery systems which are currently charged reach full charge is detected, the battery systems are switched to other battery systems for charging.
Further, the step S2 specifically includes:
s2, when P is detected pcs +P pv ≥P DCDC When the direct current converter is powered by the external network and the photovoltaic system together;
P pv the current transmission power of the photovoltaic system in the optical storage and filling system is set;
P DCDC the current transmission power of the direct current converter in the optical storage and filling system is;
P pcs the rated transmission power of the energy storage converter in the optical storage and charging system is used.
As can be seen from the above description, the external output power is controlled by the DCDC component (i.e. the dc converter), and the external network transmission power is controlled by the PCS (i.e. the energy storage converter).
Further, the step S4 specifically includes:
s41, detecting that the currently accessed battery system reaches a full charge state, and disconnecting the currently accessed battery system;
s42, control P DCDC <P pcs And switching to any other group of battery systems for charging, and returning to the step S41.
As can be seen from the above description, during the process of switching the battery system, the external output power is reduced below the transmission power of the external network, so as to avoid the damage of the device caused by the switching process; meanwhile, all battery systems are in a full charge state through continuous switching.
Further, step S5 is further included after step S4, where step S5 is:
and S5, when all the battery systems are detected to reach a full charge state, controlling all the battery systems to be in a static state.
As is clear from the above description, in order to protect the battery systems, when all the battery systems are detected to reach the full charge state, all the battery systems are left to stand, and external power is supplied by the external network and the photovoltaic system.
Further, the step S2 specifically includes:
s21, when P is detected pcs +P pv ≥P DCDC When it is, it is composed of external network and lightThe photovoltaic system supplies power to the direct current converter together;
s22, predicting the power generation capacity of the photovoltaic system within a preset time according to weather data;
s23, calculating the sum of the generated energy of the photovoltaic system in the preset time, and if the sum of the generated energy of the photovoltaic system in the preset time is larger than or equal to the minimum required electric quantity of the direct current converter, reducing the transmission power of the energy storage converter.
As can be seen from the above description, in order to save energy consumption, a prediction model is established; if the sum of the generated energy of the photovoltaic system in the preset time is detected to meet the sum of the external output electric quantity, the external output power is reduced, so that the power supply transmission power of the external network side is reduced, the external power supply time is prolonged, and the power supply proportion of the photovoltaic system side is increased.
Referring to fig. 4 and 5, a charge-discharge control terminal after capacity expansion of an optical storage and charge system includes multiple groups of expanded battery systems and an EMS (energy management system), where the EMS controls on-off of any group of battery systems and the optical storage and charge system; the terminal controls the operation of the whole system through the EMS, and executes the steps in any one of the above discharge method after the capacity expansion of the optical storage and charging system or any one of the above charge method after the capacity expansion of the optical storage and charging system.
The invention provides a charge-discharge method and a control terminal after capacity expansion of an optical storage and charge system, which are mainly applied to the optical storage and charge system after capacity expansion, and specifically described below with reference to the embodiment:
the first embodiment of the invention is as follows:
referring to fig. 1 and 3, a discharge method after capacity expansion of an optical storage and charging system is characterized in that: the method comprises the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the sum of the transmission power of a certain group of currently discharged battery systems and the transmission power of a photovoltaic system cannot meet the external charging requirement, cutting off the battery systems and controlling an external network to supply power to the outside;
s3, controlling the external output power to be reduced below the power supply of the external network;
s4, switching to any other group of battery systems and disconnecting an external network;
s5, supplying power to the outside by a certain group of battery systems and photovoltaic systems after switching, and returning to the step S1.
In this embodiment, if the local peak power time is in, the photovoltaic system and the battery system are preferentially considered to supply power to the outside, and the external power supply requirement is the power consumption requirement on the charging pile in the charging station; when the sum of the transmission power of a certain group of currently discharged battery systems and the generation power of the photovoltaic system cannot meet the external power supply requirement, the external network temporarily supplies power to the outside for ensuring the stable power supply, and meanwhile, the battery systems are prepared for switching; firstly, controlling the external output power to be reduced below the power supplied by an external network, so as to ensure that the power supply module is not damaged; then, switching of the battery system is performed; and after the switching is finished, finally, disconnecting the external network, and continuing to supply power for external requirements by using the battery system and the photovoltaic system.
The second embodiment of the invention is as follows:
referring to fig. 1 and 3, based on the first embodiment, step S2 and step S3 are specifically:
s2: when P is detected x +P pv ≤P DCDC When the battery system is cut off, the external network is controlled to supply power to the outside;
s3: control P DCDC <P pcs ；
Wherein P is x The transmission power of a certain group of battery systems which are discharged currently after capacity expansion in the optical storage and charge system is used;
P pv the current transmission power of the photovoltaic system in the optical storage and filling system is set;
P DCDC the current transmission power of the direct current converter in the optical storage and filling system is;
P pcs the rated transmission power of the energy storage converter in the optical storage and charging system is used.
That is, in this embodiment, the external output power is controlled by the DCDC component (i.e., the dc converter), and the external network transmission power is controlled by the PCS (i.e., the energy storage converter).
The third embodiment of the invention is as follows:
referring to fig. 1 and 3, based on the second embodiment, step S5 specifically includes:
s51, when P is detected x +P pv ＞P DCDC At this time, the process advances to step S52; otherwise, step S53 is entered;
s52, supplying power to the direct current converter by a certain group of battery systems and photovoltaic systems which are currently discharged, and returning to the step S1;
s53, switching to any other battery system which is not switched, and entering the next step;
s54, when P is detected x +P pv ≤P DCDC And returning to step S53 when there is still an unswitched battery pack; when P is detected x +P pv ＞P DCDC When it is time, the process returns to step S52; when P is detected y +P pv ≤P DCDC When the method is used, the next step is carried out; p (P) y The transmission power of any group of battery systems after capacity expansion in the optical storage and charging system is used;
s55, controlling the currently output battery system to continue to supply power;
and S56, when the battery system which is currently output reaches the full-discharge state, switching to discharge other battery systems until all the battery systems reach the full-discharge state.
Further comprising step S6:
s61, when all battery systems are detected to be in a full-discharge state after the capacity expansion of the optical storage and charging system is detected, all battery systems are disconnected;
and S62, controlling all the battery systems to be in a static state, and switching to the energy storage converter and the photovoltaic system to supply power for the direct current converter.
That is, in this embodiment, when the sum of the transmission power of the battery system (i.e., the currently discharged battery system of a certain group in the step) and the transmission power of the photovoltaic system after switching can meet the external required power, the current discharged battery system of a certain group and the photovoltaic system supply power to the dc converter; otherwise, the battery system is continuously switched until a certain group of battery systems capable of meeting the external required power is found. Meanwhile, if the sum of the transmission power of any group of battery systems and the transmission power of the photovoltaic system cannot meet the external required power, the current discharged group of battery systems is discharged without switching; and after the battery system of the group reaches the full-discharge state, switching another battery system of the group to discharge until all the battery systems reach the full-discharge state. The principle of the method is that in the peak electricity stage, a certain group of battery systems which can meet external requirements are discharged preferentially, electricity cost is saved, and if all the battery systems cannot meet the external power requirements, any battery system is selected to be fully discharged until the electric quantity of all the battery systems is used up; in the process, the external required power can be reduced, so that the situation that the gap between the external required power and the sum of the transmission power of the battery system and the transmission power of the photovoltaic system is too large and equipment is damaged is avoided.
The fourth embodiment of the invention is as follows:
referring to fig. 1 and 3, based on the third embodiment, step S2 specifically includes:
s21, when P is detected x +P pv ≤P DCDC When the current discharging battery system is started, predicting the residual available electric quantity of the current discharging battery system according to the historical data;
s22, predicting the power generation capacity of the photovoltaic system within a preset time according to weather data;
s23, calculating the sum of the residual available electric quantity of the battery system currently discharged in the preset time and the generated energy of the photovoltaic system, and if the sum of the residual available electric quantity of the battery system currently discharged in the preset time and the generated energy of the photovoltaic system is greater than or equal to the minimum required electric quantity of the direct current converter, continuing to supply power by the battery system currently discharged; otherwise, cutting off the battery system and controlling the external network to supply power to the outside, and entering the next step.
The calculation formula of the minimum required electric quantity of the direct current converter is as follows:
wherein P is DCDC min The minimum required electric quantity of the direct current converter is obtained;
I i connecting a DC converter withA charging current of a vehicle;
U i connecting a charging voltage of a certain vehicle to the direct current converter;
n is the total number of charged vehicles of the current light storage charging system.
In this embodiment, in order to optimize the allocation manner of the remaining power of the battery system, the allocation flow is simplified, when it is predicted that the sum of the remaining available power of a certain group of battery systems currently discharged within a preset time and the power generation amount of the photovoltaic system can meet the sum of the power supply amounts required by the outside within the preset time, the battery system is not required to be switched, the power supply of the battery system is continued, and if the requirements cannot be met, the battery system is continued to be switched.
Specifically, in this embodiment, the external demand is the charging vehicle of the charging pile, and the minimum required electric quantity is calculated according to the sum of the required electric quantities of the charging vehicles of the charging pile and the actual external demand; preferably, in one embodiment of the present invention, the ratio J of the minimum required power to the rated power of the dc converter should satisfy J e (0.8,1), where:
wherein P is DCDC rating Rated power for the direct current converter.
The sixth embodiment of the invention is:
referring to fig. 2 and 3, a charging method after capacity expansion of an optical storage and charging system includes the following steps:
s1, acquiring transmission power of each module in an optical storage and filling system;
s2, when the fact that the sum of the power supply power of the external network and the power supply power of the photovoltaic system is larger than the external required power is detected, the external network and the photovoltaic system jointly supply power for the direct current converter;
s3, controlling a currently accessed battery system to enter a charging mode;
and S4, when the current accessed battery system is detected to reach a full charge state, disconnecting the current accessed battery system and switching to any other battery system.
In this embodiment, if the photovoltaic system and the external network are in the local valley time, the photovoltaic system and the external network are preferably considered to supply power to the outside, and the external power supply requirement is the power consumption requirement on the charging pile in the charging station; when the sum of the transmission power of the current external network and the generated power of the photovoltaic system is found to be larger than the external power supply requirement, the extra power is utilized to charge a certain group of battery systems, and when the fact that the certain group of battery systems which are currently charged reach full charge is detected, the battery systems are switched to other battery systems for charging.
The seventh embodiment of the invention is as follows:
referring to fig. 2 and 3, based on the sixth embodiment, step S2 specifically includes:
s2, when P is detected pcs +P pv ≥P DCDC When the direct current converter is powered by the external network and the photovoltaic system together;
P pv the current transmission power of the photovoltaic system in the optical storage and filling system is set;
P DCDC the current transmission power of the direct current converter in the optical storage and filling system is;
P pcs the rated transmission power of the energy storage converter in the optical storage and charging system is used.
That is, in this embodiment, the external output power is controlled by the DCDC component (i.e., the dc converter), and the external network transmission power is controlled by the PCS (i.e., the energy storage converter).
The eighth embodiment of the invention is:
referring to fig. 2 and 3, based on the seventh embodiment, step S4 is specifically:
s41, detecting that a currently accessed battery system reaches a full charge state, and disconnecting the currently accessed battery system;
s42, control P DCDC <P pcs Switch to any other battery system charge and return to step S41.
Step S5 is further included after step S4, where step S5 is:
and S5, when all the battery systems are detected to reach a full charge state, controlling all the battery systems to be in a static state.
In this embodiment, in the process of switching the battery system, the external output power is reduced below the transmission power of the external network, so as to avoid the damage of devices in the switching process; simultaneously, all battery systems are in a full charge state through continuous switching; meanwhile, in order to protect the battery systems, when all the battery systems are detected to reach a full charge state, all the battery systems are kept still, and external power supply is carried out by an external network and a photovoltaic system.
The ninth embodiment of the present invention is:
referring to fig. 2 and 3, based on the eighth embodiment, step S2 is specifically:
s21, when P is detected pcs +P pv ≥P DCDC When the direct current converter is powered by the external network and the photovoltaic system together;
s22, predicting the power generation capacity of the photovoltaic system within a preset time according to weather data;
s23, calculating the sum of the generated energy of the photovoltaic system in the preset time, and if the sum of the generated energy of the photovoltaic system in the preset time is larger than or equal to the minimum required electric quantity of the direct current converter, reducing the transmission power of the energy storage converter.
Namely, in the embodiment, in order to save energy consumption, a prediction model is established; if the sum of the generated energy of the photovoltaic system in the preset time is detected to meet the sum of the external output electric quantity, the external output power is reduced, so that the power supply transmission power of the external network side is reduced, the external power supply time is prolonged, and the power supply proportion of the photovoltaic system side is increased.
Specifically, in this embodiment, two groups of new and old battery systems, i.e., a 1# battery system and a 2# battery system, are provided in the expanded optical storage and charging system.
The tenth embodiment of the invention is as follows:
referring to fig. 4 and 5, a charge-discharge control terminal after capacity expansion of an optical storage and charge system includes multiple groups of expanded battery systems and an EMS, where the EMS controls on-off of any group of battery systems and the optical storage and charge system; the terminal controls the operation of the whole system through the EMS, and executes the steps in the discharging method after the capacity expansion of the optical storage and charging system in any embodiment or the charging method after the capacity expansion of the optical storage and charging system in any embodiment.
In summary, the invention provides a method and a control terminal for charging and discharging an expanded battery system, which are used for coordinating the charging and discharging processes of an external power grid, a battery system and a photovoltaic system by collecting the transmission power of each module of the optical storage and charging system, accurately controlling the charging and discharging of each group of expanded battery systems in turn, avoiding the need of additionally configuring a whole set of power distribution equipment for the expanded battery systems, and reducing the economic cost; meanwhile, as the capacity of the battery system is increased, the pressure on the power grid side is reduced when power is used, and the power demand is met.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.

Claims (12)

1.一种光储充系统扩容后的放电方法，其特征在于：包括以下步骤：1. A discharge method after expansion of the optical storage and charging system, which is characterized by: including the following steps: S1、获取光储充系统中各模块的传输功率；S1. Obtain the transmission power of each module in the optical storage and charging system; S2、当检测到当前放电的某组电池系统与光伏系统的传输功率之和无法满足外部充电需求时，切断电池系统并控制外网对外部进行供电；S2. When it is detected that the sum of the transmission power of a currently discharged battery system and the photovoltaic system cannot meet the external charging demand, cut off the battery system and control the external network to provide external power supply; S3、控制对外输出功率降到外网供电功率以下；S3. Control the external output power to drop below the power supply of the external network; S4、切换至其他任一组电池系统并断开外网；S4. Switch to any other battery system and disconnect from the external network; S5、由切换后的某组所述电池系统和光伏系统为外部供电，并返回步骤S1。S5. A certain group of the battery system and photovoltaic system after switching provide external power supply, and return to step S1. 2.根据权利要求1所述的一种光储充系统扩容后的放电方法，其特征在于：所述步骤S2和步骤S3具体为：2. A discharging method after expansion of the optical storage and charging system according to claim 1, characterized in that: the steps S2 and S3 are specifically: S2：当检测到Px+Ppv≤PDCDC时，切断电池系统并控制外网对外部进行供电；S2: When it is detected that P x +P pv ≤ P DCDC , cut off the battery system and control the external network to provide external power supply; S3：控制PDCDC<Ppcs；S3: Control P DCDC <P pcs ; 其中，Px为光储充系统中扩容后当前放电的某组电池系统的传输功率；Among them, P x is the transmission power of a certain group of battery systems currently being discharged after capacity expansion in the optical storage and charging system; Ppv为光储充系统中光伏系统的当前传输功率；P pv is the current transmission power of the photovoltaic system in the photovoltaic storage and charging system; PDCDC为光储充系统中直流变换器的当前传输功率；P DCDC is the current transmission power of the DC converter in the optical storage and charging system; Ppcs为光储充系统中储能变流器的额定传输功率。P pcs is the rated transmission power of the energy storage converter in the optical storage and charging system. 3.根据权利要求2所述的一种光储充系统扩容后的放电方法，其特征在于：所述步骤S5具体为：3. A discharging method after expansion of the optical storage and charging system according to claim 2, characterized in that: the step S5 is specifically: S51、当检测到Px+Ppv＞PDCDC时，进入步骤S52；否则，进入步骤S53；S51. When it is detected that P x +P pv > P DCDC , go to step S52; otherwise, go to step S53; S52、由当前放电的某组所述电池系统和光伏系统为所述直流变流器供电，并返回步骤S1；S52. Use a certain group of the currently discharged battery system and photovoltaic system to power the DC converter, and return to step S1; S53、切换至其他任一未被切换过的某一组电池系统，并进入下一步骤；S53. Switch to any other battery system that has not been switched before and enter the next step; S54、当检测到Px+Ppv≤PDCDC且仍存在未切换过的电池组时，返回步骤S53；当检测到Px+Ppv＞PDCDC时，返回步骤S52；当检测到Py+Ppv≤PDCDC时，进入下一步骤；Py为光储充系统中扩容后任一组电池系统的传输功率；S54. When it is detected that P x +P pv ≤ P DCDC and there is still an unswitched battery pack, return to step S53; when it is detected that P x +P pv > P DCDC , return to step S52; when P y is detected When +P pv ≤P DCDC , go to the next step; P y is the transmission power of any group of battery systems after expansion in the optical storage and charging system; S55、控制当前输出的电池系统继续供电；S55. Control the current output battery system to continue supplying power; S56、当检测到当前输出的电池系统达到满放状态，则切换至其他电池系统放电，直至所有电池系统达到满放状态。S56. When it is detected that the current output battery system reaches the fully discharged state, switch to other battery systems for discharge until all battery systems reach the fully discharged state. 4.根据权利要求3所述的一种光储充系统扩容后的放电方法，其特征在于：所述步骤S5之后还包括步骤S6，所述步骤S6具体为：4. A discharging method after expansion of the optical storage and charging system according to claim 3, characterized in that: step S5 is followed by step S6, and step S6 is specifically: S61、当检测到光储充系统扩容后的所有所述电池系统均处于满放状态时，断开所有电池系统；S61. When it is detected that all the battery systems after the expansion of the optical storage and charging system are in a fully discharged state, disconnect all battery systems; S62、控制所有电池系统处于静置状态，切换至所述储能变流器和所述光伏系统为所述直流变流器供电。S62. Control all battery systems to be in a resting state, and switch to the energy storage converter and the photovoltaic system to supply power to the DC converter. 5.根据权利要求2所述的一种光储充系统扩容后的放电方法，其特征在于：所述步骤S2具体为：5. A discharging method after expansion of the optical storage and charging system according to claim 2, characterized in that: the step S2 is specifically: S21、当检测到Px+Ppv≤PDCDC时，根据历史数据预测当前放电的电池系统的剩余可提供电量；S21. When it is detected that P x +P pv ≤ P DCDC , predict the remaining available power of the currently discharged battery system based on historical data; S22、根据天气数据预测预设时间内的光伏系统发电量；S22. Predict the power generation of the photovoltaic system within the preset time based on weather data; S23、计算所述预设时间内当前放电的所述电池系统的剩余可提供电量与所述光伏系统的发电量之和，若所述预设时间内当前放电的所述电池系统的剩余可提供电量与所述光伏系统的发电量之和大于等于所述直流变换器的最小需求电量，则由当前放电的所述电池系统继续供电；否则，切断电池系统并控制外网对外部进行供电，进入下一步骤。S23. Calculate the sum of the remaining available power of the battery system currently discharged within the preset time and the power generation of the photovoltaic system. If the remaining available power of the battery system currently discharged within the preset time is If the sum of the electric power and the power generation of the photovoltaic system is greater than or equal to the minimum required electric power of the DC converter, the currently discharged battery system will continue to provide power; otherwise, the battery system will be cut off and the external network will be controlled to supply power to the outside. Next step. 6.根据权利要求5所述的一种光储充系统扩容后的放电方法，其特征在于：所述直流变换器的最小需求电量的计算公式如下：6. A discharging method after expansion of the optical storage and charging system according to claim 5, characterized in that: the calculation formula of the minimum required power of the DC converter is as follows: 其中，PDCDC min为直流变换器的最小需求电量；Among them, P DCDC min is the minimum power demand of the DC converter; Ii为直流变换器连接某一车辆的充电电流；I i is the charging current of a certain vehicle connected to the DC converter; Ui为直流变换器连接某一车辆的充电电压；U i is the charging voltage of a certain vehicle connected to the DC converter; n为当前光储充系统的充电车辆总数。n is the total number of charging vehicles in the current optical storage and charging system. 7.一种光储充系统扩容后的充电方法，其特征在于：包括以下步骤：7. A charging method after the capacity of the optical storage and charging system is expanded, which is characterized by: including the following steps: S1、获取光储充系统中各模块的传输功率；S1. Obtain the transmission power of each module in the optical storage and charging system; S2、当检测到外网和光伏系统的供电功率之和大于外部需求功率时，则由外网和光伏系统共同为直流变流器供电；S2. When it is detected that the sum of the power supply of the external network and the photovoltaic system is greater than the external demand power, the external network and the photovoltaic system will jointly supply power to the DC converter; S3、控制当前接入的电池系统进入充电模式；S3. Control the currently connected battery system to enter charging mode; S4、当检测到当前接入的所述电池系统达到满充状态，则断开当前接入的所述电池系统，切换至其他任一组所述电池系统。S4. When it is detected that the currently connected battery system reaches a fully charged state, disconnect the currently connected battery system and switch to any other group of battery systems. 8.根据权利要求7所述的一种光储充系统扩容后的充电方法，其特征在于：所述步骤S2具体为：8. A charging method after expansion of the optical storage and charging system according to claim 7, characterized in that: the step S2 is specifically: S2、当检测到Ppcs+Ppv≥PDCDC时，则由外网和光伏系统共同为直流变流器供电；S2. When it is detected that P pcs +P pv ≥P DCDC , the external network and the photovoltaic system will jointly supply power to the DC converter; Ppv为光储充系统中光伏系统的当前传输功率；P pv is the current transmission power of the photovoltaic system in the photovoltaic storage and charging system; PDCDC为光储充系统中直流变换器的当前传输功率；P DCDC is the current transmission power of the DC converter in the optical storage and charging system; Ppcs为光储充系统中储能变流器的额定传输功率。P pcs is the rated transmission power of the energy storage converter in the optical storage and charging system. 9.根据权利要求8所述的一种光储充系统扩容后的充电方法，其特征在于：所述步骤S4具体为：9. A charging method after expansion of the optical storage and charging system according to claim 8, characterized in that: the step S4 is specifically: S41、检测到当前接入的所述电池系统达到满充状态，断开当前接入的所述电池系统；S41. Detect that the currently connected battery system reaches a fully charged state, and disconnect the currently connected battery system; S42、控制PDCDC<Ppcs，切换至其他任一组所述电池系统充电，并返回步骤S41。S42. Control P DCDC <P pcs , switch to any other group of battery systems for charging, and return to step S41. 10.根据权利要求7所述的一种光储充系统扩容后的充电方法，其特征在于：步骤S4之后还包括步骤S5，所述步骤S5为：10. A charging method after expansion of the optical storage and charging system according to claim 7, characterized in that: step S4 is followed by step S5, and step S5 is: S5、当检测到所有所述电池系统达到满充状态，则控制所有电池系统处于静置状态。S5. When it is detected that all the battery systems have reached a fully charged state, control all battery systems to be in a resting state. 11.根据权利要求7所述的一种光储充系统扩容后的充电方法，其特征在于：所述步骤S2具体为：11. A charging method after expansion of the optical storage and charging system according to claim 7, characterized in that: the step S2 is specifically: S21、当检测到Ppcs+Ppv≥PDCDC时，则由外网和光伏系统共同为直流变流器供电；S21. When it is detected that P pcs +P pv ≥P DCDC , the external network and the photovoltaic system will jointly supply power to the DC converter; S22、根据天气数据预测预设时间内的光伏系统发电量；S22. Predict the power generation of the photovoltaic system within the preset time based on weather data; S23、计算所述预设时间内所述光伏系统的发电量之和，若所述预设时间内所述光伏系统的发电量之和大于等于所述直流变换器的最小需求电量，则降低储能变流器的传输功率。S23. Calculate the sum of the power generation of the photovoltaic system within the preset time. If the sum of the power generation of the photovoltaic system within the preset time is greater than or equal to the minimum power demand of the DC converter, reduce the storage capacity. The transmission power of the converter. 12.一种光储充系统扩容后的充放电控制终端，其特征在于：包括扩容后的多组电池系统和EMS，所述EMS控制任一组所述电池系统与所述光储充系统的通断；所述终端通过所述EMS控制整个系统的运行，执行以上权利要求1-6任一所述的一种光储充系统扩容后的放电方法或权利要求7-11任一所述的一种光储充系统扩容后的充电方法中的步骤。12. A charge and discharge control terminal after the capacity of the optical storage and charging system is expanded, which is characterized by: including multiple groups of expanded battery systems and an EMS, and the EMS controls any group of the battery systems and the optical storage and charging system. On and off; the terminal controls the operation of the entire system through the EMS, and performs the discharge method after the expansion of the optical storage and charging system described in any one of the above claims 1-6 or the discharge method described in any one of claims 7-11 The steps in the charging method after the capacity of the optical storage and charging system is expanded.
CN202310661406.3A 2023-06-06 2023-06-06 A charging and discharging method and control terminal after expansion of optical storage and charging system Pending CN116914875A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119239361A (en) * 2024-11-18 2025-01-03 河南易元泰电子科技有限公司 A photovoltaic storage and charging integrated charging station management system based on energy control algorithm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119239361A (en) * 2024-11-18 2025-01-03 河南易元泰电子科技有限公司 A photovoltaic storage and charging integrated charging station management system based on energy control algorithm

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