CN115333131A - Self-adaptive source load supply and demand balance electric vehicle charge and discharge management strategy - Google Patents

Self-adaptive source load supply and demand balance electric vehicle charge and discharge management strategy Download PDF

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CN115333131A
CN115333131A CN202211025395.1A CN202211025395A CN115333131A CN 115333131 A CN115333131 A CN 115333131A CN 202211025395 A CN202211025395 A CN 202211025395A CN 115333131 A CN115333131 A CN 115333131A
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soc
power
electric vehicle
charge
state
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CN115333131B (en
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王佳蕊
吕项羽
李德鑫
常学飞
刘畅
易荣庆
杜秋实
张家郡
孟祥东
高松
张海锋
庄冠群
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State Grid Jilin Electric Vehicle Service Co ltd
Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
State Grid Jilin Electric Power Corp
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State Grid Jilin Electric Vehicle Service Co ltd
Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
State Grid Jilin Electric Power Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/13—Maintaining the SoC within a determined range
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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

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  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses an electric vehicle charge-discharge management strategy capable of self-adapting source load supply and demand balance, which belongs to the technical field of electric vehicle charge-discharge management strategies. The electric vehicle charging and discharging management strategy provided by the invention only depends on a control algorithm and the existing equipment to realize source load supply and demand balance, other equipment does not need to be added, and no additional cost is caused.

Description

Electric vehicle charging and discharging management strategy capable of self-adapting source load supply and demand balance
Technical Field
The invention belongs to the technical field of electric vehicle charging and discharging management strategies, and particularly relates to an electric vehicle charging and discharging management strategy capable of self-adapting source load supply and demand balance.
Background
With the rapid development of distributed power supply technology, more new energy sources are incorporated into the power grid. However, the randomness intermittence of the new energy brings adverse effects to the source load supply and demand balance of the power grid, and the source load supply and demand balance is realized by considering the energy storage of the power grid. The storage battery does not contain a storage battery in the power grid, but a large number of electric automobiles are charged in a hanging mode, and the storage battery can be used as distributed energy storage, so that random fluctuation of new energy can be eliminated to a great extent if reasonable application is achieved, and the source load balance stability of the power grid is enhanced. However, the current storage battery charging and discharging strategy is not associated with the source load supply and demand balance of the power grid, and when the power of the power grid is lower than the rated load, a large number of storage batteries still work in a charging state, and the source load supply and demand imbalance is increased. Therefore, a reasonable electric vehicle charging and discharging strategy needs to be designed to realize source load supply and demand balance.
Disclosure of Invention
In view of this, in order to solve the technical problems existing in the background art, the present invention aims to provide a charge and discharge management strategy for an electric vehicle with adaptive source-load supply-demand balance.
The technical scheme adopted by the invention for realizing the purpose is as follows: an adaptive source load supply and demand balanced electric vehicle charge and discharge management strategy, the method comprising:
step 1: calculating the per unit value F of the power grid frequency based on the rated frequency of 50Hz p.u. As an index for measuring the power balance of the alternating current power grid;
the above-mentionedPower grid frequency per unit value F p.u. The calculation method of (2) is as follows:
Figure BDA0003815526030000011
wherein f is the real-time frequency of the power grid and the unit Hz;
and 2, step: calculating the weighted per unit value SOC of the charge states of all the electric vehicles in the group domain p.u. The index is used for measuring the overall charge state of the storage battery;
the weighted per unit value SOC of the charge states of all the electric vehicles in the group domain p.u. The calculation method of (2) is as follows:
Figure BDA0003815526030000021
wherein E i The total amount of chemical energy stored after the storage battery of the ith electric automobile in the group domain is charged is represented by unit J; SOC (system on chip) i The charge state of the storage battery of the ith electric automobile in the group domain is represented by percentage; n is the total number of the electric automobiles in the group domain;
and 3, step 3: by adjusting Δ P AC And Δ E bat To make the power grid frequency per unit value F p.u. And the weighted per unit value SOC of the state of charge of all electric vehicles in the group domain p.u. Keeping the same level and realizing the self-adaptive source load and demand balance, wherein delta E bat Allowing energy to be charged for the accumulator, Δ P AC The difference between the rated load power and the power generation power of the power supply in the alternating current power grid;
the specific implementation process is as follows:
when F is p.u. >SOC p.u. In the meantime, the storage battery of the electric automobile is in a charging state, so that Delta E bat Reduced and SOC p.u. Increase while allowing Δ P AC Increase and F p.u. Decrease, finally realize F p.u. ＝SOC p.u. Equivalently, the output power of the alternating current power grid is used for charging the storage battery; in the same way, when F p.u. <SOC p.u. In time, the storage battery of the electric automobile is inDischarge state of Δ E bat Increase and SOC p.u. Decrease while allowing Δ P AC Is reduced by F p.u. Is raised to finally realize F p.u. ＝SOC p.u. The method is equivalent to that the storage battery discharges to supplement power for the alternating current power grid;
and 4, step 4: comparing the SOC of each electric vehicle in the group domain with the SOCp>Enabling the storage battery of the electric automobile to work in a discharging state at SOCp.u; when SOC is reached<Enabling the storage battery of the electric automobile to work in a charging state when SOCp.u; strive for each electric automobile to realize SOC = SOC p.u. ；
And 5: in order to protect the service life of the storage battery of the electric automobile, the charging is stopped when the SOC of each electric automobile in the group domain meets the condition that the SOC is more than or equal to 99%; when the SOC is less than or equal to 51 percent, the discharging is stopped.
The self-adaptive source load supply and demand balance electric vehicle charge and discharge management strategy is that in step 3, when delta E is obtained bat When reduced, the battery operates at a state of charge, SOC p.u. Rising; when Δ E bat At the time of increase, the battery is operated in a discharge state, SOC p.u. Descending; when Δ P AC When the power is increased, the difference between the representative load rated power and the power output becomes larger, and F is caused p.u. Decrease when Δ P AC When the frequency is reduced to zero, the load rated power is matched with the power output power, and the power grid frequency is rated frequency, namely F p.u. The value is 1.
Through the design scheme, the invention can bring the following beneficial effects:
1. the electric vehicle charging and discharging management strategy capable of self-adapting to source load supply and demand balance provided by the invention plays a distributed energy storage role of a grid-connected electric vehicle storage battery, counteracts random power disturbance of a distributed power supply and realizes source load supply and demand balance.
2. The source load supply and demand balance is realized only by a control algorithm and the existing equipment, other equipment does not need to be added, and no additional cost is caused.
3. The storage battery protection algorithm is adopted, overcharge and overdischarge are avoided, and the service life of the storage battery is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limitation and are not intended to limit the invention in any way, and in which:
fig. 1 is a schematic diagram of a dual droop adaptive algorithm of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the present invention is not limited by the following examples, and the specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention.
The embodiment of the application provides an electric vehicle charging and discharging management strategy for self-adaptive source load supply and demand balance, and a power grid frequency per unit value F of a power distribution network power balance coefficient is utilized p.u. Weighted per unit value SOC with group domain electric vehicle state of charge p.u. The flow direction of power is judged in a self-adaptive mode, the power energy conservation quantity of an alternating current power grid and a storage battery pack is adjusted, and automatic source-load matching is achieved;
the method specifically comprises the following steps:
step 1: calculating the per unit value F of the power grid frequency by taking the rated frequency of 50Hz as a reference p.u. As an index for measuring the power balance of the alternating current power grid;
the power grid frequency per unit value F p.u. The calculation method of (2) is as follows:
Figure BDA0003815526030000031
wherein f is the real-time frequency of the power grid in Hz;
step 2: calculating the weighted per unit value SOC of the charge states of all the electric vehicles in the group domain p.u. The index is used for measuring the overall charge state of the storage battery;
the weighted per unit value SOC of the state of charge of all the electric vehicles in the group domain p.u. The calculation method of (2) is as follows:
Figure BDA0003815526030000041
wherein E i The total amount of chemical energy stored after the storage battery of the ith electric automobile in the group domain is charged is represented by unit J; SOC (system on chip) i The charge state of the storage battery of the ith electric automobile in the group domain is represented by percentage; n is the total number of the electric automobiles in the group domain;
and step 3: when F is present p.u. >SOC p.u. In time, the storage battery of the electric automobile is in a charging state, so that Delta E bat Is a positive value; consuming network power simultaneously, making Δ P AC Is negative. When F is p.u. <SOC p.u. In the meantime, the storage battery of the electric automobile is in a discharging state, so that Delta E is enabled bat Is a negative value; at the same time, the power of the power grid is supplemented to enable delta P AC Is positive, finally realizes F p.u. ＝SOC p.u. ；
And 4, step 4: state of charge (SOC) and SOC of each electric vehicle in group domain p.u. When making a comparison, when the SOC is>SOC p.u. When the electric vehicle storage battery works in a discharging state; when SOC is reached<SOC p.u. When the electric vehicle is in a charging state, the storage battery of the electric vehicle works; striving for each electric automobile to realize SOC = SOC p.u. ；
And 5: in order to protect the service life of the storage battery of the electric automobile, the charging is stopped when the SOC of each electric automobile in the group domain meets the condition that the SOC is more than or equal to 99%; when the SOC is less than or equal to 51 percent, the discharging is stopped.
FIG. 1 is a diagram illustrating a dual droop adaptive algorithm, where Δ P AC The unit is kW which is the difference between the load rated power and the power generation power of the power supply in the alternating current power grid; delta E bat The charging energy is allowed for the battery in kWh. In the drawing, the left half plane is Δ E in the battery system bat And SOC p.u. Sag characteristic of, delta E bat The charging energy is allowed for the storage battery,when Δ E bat When reduced, the battery operates at a state of charge, SOC p.u. Rising; when Δ E bat At the time of increase, the battery is operated in a discharge state, SOC p.u. The decrease is shown by Δ E in the direction of the arrow on the horizontal axis bat Increasing the direction. In the drawing, the right half plane is Δ P in the battery system AC And F p.u. Sag characteristic of (1), Δ P AC Is the difference between the rated load power and the power generated by the power supply in the AC power grid when the power is delta P AC When the power is increased, the difference between the representative load rated power and the power output becomes larger, and F is caused p.u. Decrease when Δ P AC When the frequency is reduced to zero, the load rated power is matched with the power output power, and the power grid frequency is rated frequency, namely F p.u. The value is 1.
The final purpose of the self-adaptive source load supply and demand balance electric vehicle charge and discharge management strategy provided by the embodiment of the application is to properly adjust delta P AC And Δ E bat To make the power grid frequency per unit value F p.u. Weighted per unit value SOC with the state of charge of all electric vehicles in the group domain p.u. Keeping the same level, as shown in fig. 1, the final purpose of the regulation is to keep the working state points of the storage battery system and the alternating current power grid on the same horizontal line, marked by dot-dash lines in the figure, to realize self-adaptive source load supply and demand balance, and then through the primary frequency modulation and secondary frequency modulation of the power grid, to keep the power grid working frequency at a rated value, and simultaneously to satisfy the completion of the charging of the storage battery of the electric vehicle.
The embodiment of the present application further provides a computer-readable storage medium, which can be applied to any scenario that requires an electric vehicle charging and discharging management policy technology, where the computer-readable storage medium stores instructions, and when the instructions are executed, the computer executes the step of the electric vehicle charging and discharging management policy for adaptive source-load supply-demand balance. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device.

Claims (4)

1. A self-adaptive source load supply and demand balance electric vehicle charge and discharge management strategy is characterized by comprising the following steps:
step 1: obtaining a per unit value F of the power grid frequency by taking the rated frequency of 50Hz as a reference p.u. As an index for measuring the power balance of the alternating current power grid;
step 2: obtaining the weighted per unit value SOC of the charge states of all the electric vehicles in the group domain p.u. The index is used for measuring the overall charge state of the storage battery;
and step 3: by adjusting Δ P AC And Δ E bat Make the per unit value F of the grid frequency p.u. And the weighted per unit value SOC of the state of charge of all electric vehicles in the group domain p.u. Keeping the same level and realizing the self-adaptive source-load supply-demand balance, wherein the delta E bat Allowing energy to be charged for the accumulator, Δ P AC The difference between the rated load power and the power generation power of the power supply in the alternating current power grid;
the specific implementation process is as follows:
when F is p.u. >SOC p.u. In the meantime, the storage battery of the electric automobile is in a charging state, so that Delta E bat Reduced and SOC p.u. Increase while allowing Δ P AC Increase and F p.u. Decrease to finally realize F p.u. ＝SOC p.u. (ii) a In the same way, when F p.u. <SOC p.u. In the meantime, the storage battery of the electric automobile is in a discharging state, so that Delta E bat Increase and SOC p.u. Decrease while allowing Δ P AC Is reduced by F p.u. Is raised to finally realize F p.u. ＝SOC p.u. ；
And 4, step 4: the state of charge SOC and SOC of each electric vehicle in the group domain p.u. By comparison, when SOC is>SOC p.u. When the electric vehicle is in a discharge state, the storage battery of the electric vehicle works; when the SOC is<SOC p.u. In the meantime, the electric vehicle storage battery is operated in a charging state to ensure that each electric vehicle SOC = SOC p.u. ；
And 5: when the SOC of each electric vehicle in the group domain meets the condition that the SOC is more than or equal to 99%, the charging is stopped; when the SOC is less than or equal to 51 percent, the discharging is stopped.
2. The adaptive source load supply and demand balance electric vehicle charge and discharge management strategy according to claim 1, wherein: the per unit value F of the power grid frequency p.u. The calculation method of (2) is as follows:
Figure FDA0003815526020000011
wherein f is the real-time frequency of the power grid in Hz.
3. The adaptive source load supply and demand balance electric vehicle charge and discharge management strategy according to claim 1, wherein: the weighted per unit value SOC of the state of charge of all the electric vehicles in the group domain p.u. The calculation method of (2) is as follows:
Figure FDA0003815526020000021
wherein E i The total amount of chemical energy stored after the storage battery of the ith electric automobile in the group domain is charged is represented by unit J; SOC i The charge state of the storage battery of the ith electric automobile in the group domain is in percentage; and n is the total number of the electric automobiles in the group domain.
4. The adaptive source load supply and demand balance electric vehicle charge and discharge management strategy according to claim 1, wherein: in said step 3, when Δ E bat When reduced, the battery operates at a state of charge, SOC p.u. Rising; when Δ E bat At the time of increase, the battery is operated in a discharge state, SOC p.u. Descending; when Δ P is AC When the power supply voltage increases, the difference between the representative load rated power and the power supply output power becomes large, resulting in F p.u. Decrease when Δ P AC When the frequency is reduced to zero, the load rated power is matched with the power output power, and the power grid frequency is rated frequency, namely F p.u. The value is 1.
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