[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

CN118182255A - Composite energy storage control method - Google Patents

Composite energy storage control method Download PDF

Info

Publication number
CN118182255A
CN118182255A CN202410283085.2A CN202410283085A CN118182255A CN 118182255 A CN118182255 A CN 118182255A CN 202410283085 A CN202410283085 A CN 202410283085A CN 118182255 A CN118182255 A CN 118182255A
Authority
CN
China
Prior art keywords
power
battery
power battery
given
max
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
CN202410283085.2A
Other languages
Chinese (zh)
Inventor
宋克岭
倪永亮
路聪慧
蒋任君
刘振东
王平平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China North Vehicle Research Institute
Original Assignee
China North Vehicle Research Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China North Vehicle Research Institute filed Critical China North Vehicle Research Institute
Priority to CN202410283085.2A priority Critical patent/CN118182255A/en
Publication of CN118182255A publication Critical patent/CN118182255A/en
Pending legal-status Critical Current

Links

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
    • 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]
    • B60L58/14—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
    • 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
    • B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

When the power required by the power grid is increased, the power battery supplies power to the power grid side through bidirectional DC/DC so as to meet the power requirement of the power grid; when the power grid is high in power, the power grid charges the power battery through bidirectional DC/DC, energy is recovered from the power grid, and power balance at the power grid side is achieved. The method can realize the controlled output/charging of the power battery, not only meets the power requirement of a power grid, but also can realize the charge and discharge management of the battery according to the working condition of the power battery, and avoid the overcharge or overdischarge of the power battery.

Description

Composite energy storage control method
Technical Field
The invention relates to the technical field of power systems and batteries, in particular to a composite energy storage control method.
Background
At present, in an electric automobile or a hybrid electric automobile, the characteristics of light weight, high power density, high energy density and the like of a power battery become a main energy storage unit of an energy storage system.
The energy storage system of the light hybrid vehicle is powered by a single power battery, is directly connected to a power grid to provide electric energy for relevant loads of the vehicle, and can be piled up on the power grid under the condition that the motion state of the vehicle is changeable, such as transient power brought by frequent acceleration and deceleration operations is not absorbed by the power battery, so that the voltage fluctuation range of the power grid is large, or the battery is overcharged and overdischarged to influence the service life of the battery. Therefore, the voltage stability of the power grid cannot be maintained by simply relying on the energy storage of the power battery.
In order to solve the problems, the composite energy storage system becomes a new research hot spot. The composite energy storage system consists of a power battery energy storage unit and a bidirectional DC/DC converter, wherein all parts of the composite energy storage system are coordinated with each other to realize the safe control of the charge and discharge of the power battery.
Therefore, an energy management strategy of composite energy storage is required to be provided, the charge and discharge of the power battery are safely controlled, and the power supply task borne by the power battery can be adjusted, so that the whole service life of the power battery is maximized, and the phenomenon of overcharge or overdischarge of the power battery is avoided.
Disclosure of Invention
The composite energy storage control method is used for realizing the controlled output/charging of the power battery, not only meeting the power demand of a power grid, but also realizing the charge and discharge management of the battery according to the working condition of the power battery and avoiding the overcharge or overdischarge of the power battery.
The composite energy storage control method is used for a composite energy storage system circuit structure and mainly comprises a power battery energy storage unit and a bidirectional DC/DC converter, and can realize bidirectional flow between energy and a power grid to realize system energy balance through composite energy storage control: if the energy in the power grid is excessive, the energy is stored in the power battery energy storage unit, so that standby energy is stored for the power grid, the energy utilization rate is improved, and the waste is reduced; and if the energy shortage occurs in the power grid, the power battery energy storage unit releases electric energy and supplies power for the power grid.
The method mainly comprises the following steps: power battery power output and power battery power recovery:
1. Power battery power output
When the power required by the power grid is increased, the power battery supplies power to the power grid side through the bidirectional DC/DC so as to meet the power demand of the power grid.
(1) Setting a maximum allowable discharge time t max, enabling the power battery to receive a power output instruction, supplementing power to a power grid according to the power output time t Discharge of electric power required by the instruction, discharging according to t max when the discharge time t Discharge of electric power ≥tmax is given, stopping output after discharging, entering a power battery SOC recovery mode, and charging the power battery by bidirectional DC/DC.
(2) When the single controlled power output time t n≤tmax is output according to a given t n, timing is carried out, the next output time t n+1 is output according to t n+1 when t ∑＝tn+tn+1≤tmax, and accumulated timing is continued, and when t ∑＝t1+t2+…+tn＞tmax, a battery power battery SOC recovery program is executed;
(3) After receiving the output instruction, the power battery enters a power battery SOC recovery mode, is charged according to constant voltage and current limiting of the power battery power receiving capacity, when the battery voltage U b≥Ubmin is high, t ∑ is cleared, a discharging instruction is received, and the power battery is allowed to discharge;
(4) The power battery receives a discharging instruction in the SOC recovery mode, and allows power output of the power battery at t ∑＜tmax;
(5) When the battery is in a charging mode, the battery voltage U b≥Ub Given a given is cleared to t ∑, and the next power output is allowed;
2. Power battery power recovery
When the power grid is high in power, the power grid charges the power battery through bidirectional DC/DC, energy is recovered from the power grid, and power balance at the power grid side is achieved.
(1) The bidirectional DC/DC receives an energy recovery instruction and charges a battery according to the instruction requirement;
(2) When the recovery power P Given a given is larger than the recovery power P max of the power battery, the power battery is recovered according to the recovery power P max of the power battery;
(3) Setting the highest voltage U bmax of the power battery, stopping energy recovery when the voltage U b≥Ubmax of the power battery is reached, and enabling the power battery to enter an SOC recovery mode;
(4) And in the power battery SOC recovery mode, the power battery discharges to the main power grid through the bidirectional DC/DC constant current I Given a given , and the discharging is stopped when the power battery voltage U b≤Ub Given a given .
Compared with the prior art, the beneficial effects of the present disclosure are: (1) According to different SOC conditions of the power battery, charge and discharge management of the battery is realized, overcharge or overdischarge of the power battery is avoided, and the service life of the power battery is prolonged; (2) The power requirement of the power grid is met, and the power balance of the power grid can be kept, so that the power grid can stably run; (3) The energy storage states of the power battery under different working conditions can be balanced.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a schematic diagram of an exemplary composite energy storage system circuit configuration for use in the present disclosure;
Fig. 2 is a flow chart of a composite energy storage control method according to the present disclosure.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The present disclosure provides a composite energy storage control method, and an exemplary composite energy storage control system circuit structure applying the method is shown in fig. 1, and mainly includes: the bidirectional DC/DC of the embodiment can adopt various circuit structures, the embodiment adopts bidirectional buck-boost topology, and the power battery energy storage unit is connected to the power grid side in parallel through the bidirectional DC/DC converter.
In the embodiment, through the composite energy storage control, bidirectional flow between energy and a power grid can be realized, and system energy balance is realized. If the energy in the power grid is excessive, the energy is stored in the power battery energy storage unit, so that standby energy is stored for the power grid, the energy utilization rate is improved, and the waste is reduced; and if the energy shortage occurs in the power grid, the power battery energy storage unit releases electric energy and supplies power for the power grid.
Specifically, the composite energy storage control mainly comprises the following two parts: power battery power output and power battery power recovery. An exemplary operational flow diagram of the control strategy is shown in FIG. 2, with the following detailed steps:
1. Power battery power output
When the power required by the power grid is increased, the power battery supplies power to the power grid side through the bidirectional DC/DC so as to meet the power demand of the power grid.
(1) Setting a maximum allowable discharge time t max, enabling the power battery to receive a power output instruction, supplementing power to a power grid according to the power output t Discharge of electric power required by the instruction, discharging according to t max when the discharge time t Discharge of electric power ≥tmax is given, stopping outputting after discharging, entering a power battery SOC recovery mode, and charging the power battery by bidirectional DC/DC.
(2) When the single controlled power output time t n,tn≤tmax is output according to a given t n, timing is carried out, the next output time t n+1 is output according to t n+1 when t ∑＝tn+tn+1≤tmax, and accumulated timing is continued, and when t ∑＝t1+t2+…+tn＞tmax, a battery power battery SOC recovery program is executed;
(3) After receiving the output instruction, the power battery enters a power battery SOC recovery mode, is charged according to constant voltage and current limiting of the power battery power receiving capacity, when the battery voltage U b≥Ubmin is high, t ∑ is cleared, a discharging instruction is received, and the power battery is allowed to discharge;
(4) The power battery receives a discharging instruction in the SOC recovery mode, and allows power output of the power battery at t ∑＜tmax;
(5) When the battery is in a charging mode, the battery voltage U b≥Ub Given a given is cleared to t ∑, and the next power output is allowed;
2. Power battery power recovery
When the power grid is high in power, the power grid charges the power battery through bidirectional DC/DC, energy is recovered from the power grid, and power balance at the power grid side is achieved.
(1) The bidirectional DC/DC receives an energy recovery instruction and charges a battery according to the instruction requirement;
(2) When the recovery power P Given a given is larger than the recovery power P max of the power battery, the power battery is recovered according to the recovery power P max of the power battery;
(3) Setting the highest voltage U bmax of the power battery, stopping energy recovery when the voltage U b≥Ubmax of the power battery is reached, and enabling the power battery to enter an SOC recovery mode, wherein the battery is only discharged and not charged, otherwise, the battery is over-voltage;
(4) And in the power battery SOC recovery mode, the power battery discharges to the main power grid through the bidirectional DC/DC constant current I Given a given , and the discharging is stopped when the power battery voltage U b≤Ub Given a given . U b Given a given is the expected value of the battery voltage set by the energy storage system, and the voltage will deviate around U b Given a given during the battery charging and discharging process.
According to the composite energy storage control strategy, different charge and discharge capacities of the power battery in a complex environment can be considered, and the SOC is dynamically adjusted according to different working modes, so that the peak clipping and valley filling energy requirements are provided for the power grid stably. When the SOC of the power battery is smaller, the power battery can be charged and discharged more or less; when the SOC of the power battery is larger, the power battery can be charged more and less, and the quick charging requirement of the vehicle is met. Meanwhile, the voltage of the power battery is not limited by the voltage of the power grid, and the decoupling of the voltage of the power battery and the voltage of the power grid is realized.
Therefore, the composite energy storage control strategy provided by the embodiment controls the composite energy storage system according to different SOC conditions of the power battery, so that the power balance of the power grid can be maintained, and the power grid can stably run; meanwhile, the energy storage states of the power battery under different working conditions can be balanced, and the overcharge or overdischarge of the power battery can be effectively avoided.
The foregoing technical solutions are merely exemplary embodiments of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the application methods and principles disclosed in the present invention, not limited to the methods described in the foregoing specific embodiments of the present invention, so that the foregoing description is only preferred and not in a limiting sense.

Claims (6)

1. A composite energy storage control method for a composite energy storage system, the composite energy storage system circuit structure comprising: the power battery energy storage unit is connected to the power grid side in parallel through the bidirectional DC/DC converter;
the composite energy storage control method comprises the following steps:
S1, power output of a power battery: when the power required by the power grid is increased, the power battery supplies power to the power grid side through the bidirectional DC/DC so as to meet the power requirement of the power grid;
S2, power recovery of the power battery: when the power grid is high in power, the power grid charges the power battery through bidirectional DC/DC, energy is recovered from the power grid, and power balance at the power grid side is achieved.
2. The method according to claim 1, wherein the step S1 specifically comprises:
Setting a maximum allowable discharge time t max, enabling the power battery to receive a power output instruction, supplementing power to a power grid according to the power output required by the instruction, discharging according to t max when the given discharge time t Discharge of electric power ≥tmax in the instruction, stopping outputting after discharging, entering a power battery SOC recovery mode, and charging the power battery by bidirectional DC/DC;
When the single controlled power output time t n≤tmax is given in the instruction, single power output is carried out according to the given t n, timing is carried out, the next output time t n+1 is carried out, when t ∑＝tn+tn+1≤tmax is carried out, output is carried out according to t n+1, and accumulated timing is continued, and when t ∑＝t1+t2+…+tn＞tmax is carried out, the power battery SOC recovery program is executed for charging.
3. The method according to claim 2, wherein the step S1 further comprises:
After receiving the output instruction, the power battery enters a power battery SOC recovery mode, is charged according to constant voltage and current limiting of the power receiving capacity of the battery, and when the battery voltage U b is more than or equal to the minimum allowable working voltage U bmin of the battery, the power battery is cleared to t ∑, receives a discharge instruction and allows the power battery to discharge;
The power battery receives a discharging instruction in the SOC recovery mode, and allows power output of the power battery at t ∑＜tmax;
When the battery is in a charging mode, the battery voltage U b is larger than or equal to a battery voltage expected value U b Given a given set by the energy storage system, t ∑ is cleared, and next power output is allowed.
4. A method according to any one of claims 1-3, wherein step S2 comprises:
The bidirectional DC/DC receives an energy recovery instruction and charges a battery according to the instruction requirement;
When the given recovery power P Given a given in the recovery command is greater than the power battery recovery capacity P max, recovering according to the power battery recovery capacity P max;
And setting the highest voltage U bmax of the power battery, stopping energy recovery when the voltage U b≥Ubmax of the power battery is reached, and enabling the power battery to enter an SOC recovery mode.
5. The method according to claim 4, wherein in the step S2, after the power battery enters the SOC recovery mode, the power battery is discharged to the main power grid through the bi-directional DC/DC constant current I Given a given , and the discharging is stopped when the power battery voltage U b≤Ub Given a given .
6. The method of claim 1, further comprising the step of dynamically adjusting the SOC based on different modes of operation.
CN202410283085.2A 2024-03-13 2024-03-13 Composite energy storage control method Pending CN118182255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410283085.2A CN118182255A (en) 2024-03-13 2024-03-13 Composite energy storage control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410283085.2A CN118182255A (en) 2024-03-13 2024-03-13 Composite energy storage control method

Publications (1)

Publication Number Publication Date
CN118182255A true CN118182255A (en) 2024-06-14

Family

ID=91397453

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410283085.2A Pending CN118182255A (en) 2024-03-13 2024-03-13 Composite energy storage control method

Country Status (1)

Country Link
CN (1) CN118182255A (en)

Similar Documents

Publication Publication Date Title
US10464441B2 (en) Charging facility and energy management method for charging facility
US7859202B2 (en) Power management for multi-module energy storage systems in electric, hybrid electric, and fuel cell vehicles
US6043629A (en) Modular control electronics for batteries
US9365175B2 (en) Power supply system for vehicle
US20120104861A1 (en) High voltage electric accumulators with internal distributed dc-dc converters for self regulation and protection
CN112751376B (en) Energy management method of hybrid power supply system
CN102903186A (en) Electromobile charging pile and operating method thereof
CN102856946A (en) Energy storage apparatus and energy storage system
JP7189861B2 (en) Charging device and charging method
CN114290916A (en) Energy management method and system for hydrogen fuel hybrid power heavy truck
CN101917043A (en) Lithium-ion battery charge-discharge control circuit
CN110829464A (en) Photovoltaic energy storage battery frequency modulation system and method based on direct current side
CN111546942A (en) Low-voltage direct-current charging and discharging source management system of high-voltage power battery in communication base station
CN111231713A (en) Electric automobile charging and discharging system and control method
CN112510803B (en) Single-channel module of airplane distributed power grid structure, power generation system and control method
CN118182255A (en) Composite energy storage control method
CN215322084U (en) Energy storage type direct current charging pile
CN116278906A (en) Echelon storage and charging and replacement integrated power supply system, control method thereof and charging equipment
CN113852061A (en) Photovoltaic power generation-containing DC micro-grid work control method
JP7006572B2 (en) Vehicle charge control system
CN113422378A (en) Comprehensive energy system of energy hub
CN116601046A (en) Power supply system
JP4654262B2 (en) DC power supply system and charging method thereof
CN210898560U (en) Intelligent battery system with parallel mains supply
CN221597435U (en) Energy 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