CN117039961A - Micro-grid hybrid energy storage system and method - Google Patents
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- 230000005611 electricity Effects 0.000 claims description 7
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
-
- 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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of hybrid energy storage systems, in particular to a micro-grid hybrid energy storage system and a micro-grid hybrid energy storage method, wherein the micro-grid hybrid energy storage system comprises a power generation module, an energy storage module, a micro-grid integration module, a preset information storage module, a detection module, a control module and a communication module; the control module is in communication connection with the communication module, calculates an available time selection function of the energy storage module according to the related information, obtains available time information of the energy storage module according to the available time selection function of the energy storage module, transmits the available time information of the energy storage module to the communication module, and transmits the available time information of the energy storage module to the power grid end. The power grid end can check the available time of the energy storage module, and a worker continuously observes the working state of the energy storage module at a critical time point, or replaces the energy storage module in advance, so that the system always continuously and stably works.
Description
Technical Field
The invention relates to the technical field of hybrid energy storage systems, in particular to a micro-grid hybrid energy storage system and a micro-grid hybrid energy storage method.
Background
The micro-grid is also called micro-grid, which refers to a small power generation and distribution system composed of a distributed power supply, an energy storage module device, an energy conversion device, a load, a monitoring and protecting device and the like.
An energy storage system refers to a system that stores energy in the form of electrical energy or the like, through different mediums, and releases it when needed. According to the storage mode, it can be divided into chemical energy storage and physical energy storage. Chemical energy storage includes hydrogen, hydrocarbon oxygen and electrochemical energy storage modes. Electrochemical energy storage also comprises lithium ion batteries, flow batteries, lead storage batteries, sodium-based batteries and the like. The physical energy storage includes pumped storage, compressed air storage, flywheel energy storage, energy storage and the like. Hybrid energy storage systems are systems that integrate multiple energy storage modes.
Many energy storage systems have now been developed, and a great deal of research and reference has been made to find prior art energy storage systems as disclosed in publication nos. CN111682528A, CN114844098A, CN103683309A, CN110311396a and CN109390926a, which generally include: the micro-grid control module is used for controlling the electric energy converted by the power generation module to be input into the energy storage module, and the energy storage module is used for storing the electric energy.
However, because the life of the energy storage module is limited, the current energy storage system cannot estimate the available time of the energy storage module, and when the energy storage module fails, a large-area power failure is caused, which causes a certain loss to a user.
Disclosure of Invention
The invention aims to estimate the available time of an energy storage module and provides a micro-grid hybrid energy storage system and method aiming at the defects.
The invention adopts the following technical scheme:
the micro-grid hybrid energy storage system comprises a power generation module, an energy storage module, a micro-grid integration module, a preset information storage module, a detection module, a control module and a communication module;
the power generation module is in communication connection with the energy storage module and is used for converting energy and transmitting the energy to the energy storage module;
the micro-grid integrated module is in communication connection with the power generation module and the energy storage module, and is used for controlling energy transmission;
the preset information storage module is in communication connection with the control module, and is used for storing the information of the total number of charge and discharge cycles, the charge state weight index of the energy storage module, the charge and discharge depth weight index of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single-use electric quantity of all users, and transmitting the information to the control module;
the detection modules are all in communication connection with the energy storage module and the control module, and are used for detecting the energy storage module and outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
the control module is in communication connection with the communication module, calculates an available time selection function of the energy storage module according to the related information, obtains available time information of the energy storage module according to the available time selection function of the energy storage module, and transmits the available time information to the communication module;
and the communication module transmits the information of the available time of the energy storage module to the power grid end.
Optionally, the detection module includes a state of charge detection sub-module, a charge-discharge depth detection sub-module, a voltage detection sub-module, a current detection sub-module, a temperature detection sub-module and a power detection sub-module, where the state of charge detection sub-module, the charge-discharge depth detection sub-module, the voltage detection sub-module, the current detection sub-module, the temperature detection sub-module and the power detection sub-module are all connected with the control module in a communication manner;
the charge state detection submodule is used for outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state and energy storage module at sub-discharge +.>Information of the charge state in secondary discharging is transmitted to the control module;
the charge and discharge depth detection sub-module is used for outputting the first energy storage moduleSecondary charging depth and energy storage module->Information of the secondary discharge depth is transmitted to the control module;
the voltage detection submodule is used for outputting the first energy storage moduleThe information of the maximum voltage value during secondary charge and discharge is transmitted to the control module;
the current detection submodule is used for outputting the first energy storage moduleThe information of the maximum current value during secondary charge and discharge is transmitted to the control module;
the temperature detection submodule is used for outputting the first energy storage moduleInformation of the maximum temperature during secondary charge and discharge is transmitted to the control module;
the power detection submodule is used for outputting an energy storage modulePower at secondary chargeEnergy storage module->And information of power in secondary discharge is transmitted to the control module.
Optionally, when the control module calculates the actual charge-discharge cycle coefficient of the energy storage module, the following formula is satisfied:
；
；
；
；
wherein,for the actual charge-discharge cycle coefficient of the energy storage module, +.>Is the total number of charge and discharge cycles>For the state of charge coefficient of the energy storage module, +.>For the depth coefficient of charge and discharge of the energy storage module, +.>Operating a reference coefficient for the energy storage module, ">As a maximum function>As a function of the minimum value +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-discharge, +.>Energy storage module no->The state of charge at the time of the secondary discharge;
the state of charge weight index of the energy storage module;
for the weight index of the depth of charge and discharge of the energy storage module, +.>Energy storage module no->Secondary charge depth,/->Energy storage module no->Secondary depth of discharge;
running a reference weight index for the energy storage module, +.>Energy storage module no->Maximum voltage during secondary charge and discharge, +.>Energy storage module no->Maximum current value during secondary charge and discharge, +.>Energy storage module no->Maximum temperature at the time of secondary charge and discharge.
Optionally, when the control module calculates the loss coefficient of the energy storage module, the following formula is satisfied:
；
wherein,for the loss factor of the energy storage module->For theoretical charge-discharge cycle times of the energy storage module, +.>Energy storage module no->Secondary fillingElectric time power, +.>Energy storage module no->Power at time of secondary discharge, < >>And the electricity is used for all users singly.
Optionally, when the control module calculates the available time selection function of the energy storage module, the following formula is satisfied:
；
wherein,selecting a function for the time available for the energy storage module, < >>To->The threshold values are selected for the time available for the different energy storage modules.
Optionally, the system further comprises an alarm module, wherein the alarm module is in communication connection with the control module;
the preset information storage module is also used for storing information of the maximum theoretical capacity of the energy storage module, the rated capacity of the energy storage module and the total detection times and transmitting the information to the control module;
the detection module is also used for outputting an energy storage moduleThe information of the available capacity in secondary detection is transmitted to the control module;
the control module is used for controlling the energy storage module according to the theoretical capacity maximum value of the energy storage module, the loss coefficient of the energy storage module, the rated capacity of the energy storage module, the total detection times and the first energy storage moduleThe available capacity calculates the reference coefficient of the use state of the energy storage module during secondary detection, calculates alarm information according to the reference coefficient of the use state of the energy storage module and transmits the alarm information to the alarm module;
and the alarm module carries out alarm according to the alarm information.
Optionally, the detection module further includes a capacity detection sub-module, and the capacity detection sub-module is connected with the control module in a communication manner;
the capacity detection submodule is used for outputting the first energy storage moduleAnd information of the available capacity in the secondary detection is transmitted to the control module.
Optionally, when the control module calculates the reference coefficient of the use state of the energy storage module, the following formula is satisfied:
；
wherein,use of state reference coefficients for energy storage modules, +.>For maximum theoretical capacity of the energy storage module, < >>For the rated capacity of the energy storage module, < >>For detecting total times +.>The values of->Or->Or->When->When the energy storage module is rated as a superior product for staff, when +>When the energy storage module grade is rated as a qualified product, the working personnel is judged thatWhen the energy storage module is rated as defective product for staff, the energy storage module is rated as defective product for staff>Energy storage module no->Capacity available at the time of detection.
Optionally, when the control module calculates the alarm information, the following formula is satisfied:
；
wherein,for alarm information->Using a selection function of state reference coefficients for the energy storage module whenWhen the energy storage module is used normally, no alarm is needed, and when +.>When the energy storage module is abnormally used, an alarm is required.
The invention also provides a micro-grid hybrid energy storage method, and the micro-grid hybrid energy storage system comprises the following steps:
s1: the power generation module converts energy and transmits the energy to the energy storage module, and the micro-grid integrated module controls the energy transmission;
s2: the information storage module is used for storing the information of the total number of charge and discharge cycles, the weight index of the charge state of the energy storage module, the weight index of the charge and discharge depth of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single daily electric quantity of all users, and transmitting the information to the control module;
s3: the detection module detects the energy storage module and outputs the first energy storage moduleCharge state during secondary charging and energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
s4: the control module calculates an available time selection function of the energy storage module according to the related information, obtains the available time information of the energy storage module according to the available time selection function of the energy storage module and transmits the available time information to the communication module;
s5: and the communication module transmits the information of the available time of the energy storage module to the power grid end.
The beneficial effects obtained by the invention are as follows:
1. the control module calculates an available time selection function of the energy storage module according to the related information, obtains information of the available time of the energy storage module according to the available time selection function of the energy storage module and transmits the information to the communication module, so that the power grid end can check the available time of the energy storage module, and a worker continuously observes the working state of the energy storage module at a critical time point or replaces the energy storage module in advance to enable the system to continuously and stably work all the time;
2. when the loss coefficient of the energy storage module is calculated, the single daily electricity consumption of all users is considered, so that the calculated available time of the energy storage module is more in line with the actual situation;
3. when the energy storage module is abnormal in use, the alarm module immediately gives an alarm, and at the moment, staff can make a corresponding scheme according to relevant parameters, and the energy storage module can be protected to a greater extent.
For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a detection module according to the present invention;
FIG. 3 is a flow chart of the method of the present invention;
FIG. 4 is a schematic structural diagram of a warning module in a second embodiment of the present invention;
fig. 5 is a calculation flow chart of the control module in the second embodiment of the invention.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not drawn to actual dimensions, and are stated in advance. The following embodiments will further illustrate the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
Embodiment one: the present embodiment provides a micro-grid hybrid energy storage system, in combination with fig. 1 to 3.
The micro-grid hybrid energy storage system comprises a power generation module, an energy storage module, a micro-grid integration module, a preset information storage module, a detection module, a control module and a communication module;
the power generation module is in communication connection with the energy storage module and is used for converting energy and transmitting the energy to the energy storage module;
the micro-grid integrated module is in communication connection with the power generation module and the energy storage module, and is used for controlling energy transmission;
the preset information storage module is in communication connection with the control module, and is used for storing the information of the total number of charge and discharge cycles, the charge state weight index of the energy storage module, the charge and discharge depth weight index of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single-use electric quantity of all users, and transmitting the information to the control module;
the detection modules are all in communication connection with the energy storage module and the control module, and the detection modules areThe block is used for detecting the energy storage module and outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
the control module is in communication connection with the communication module, calculates an available time selection function of the energy storage module according to the related information, obtains available time information of the energy storage module according to the available time selection function of the energy storage module, and transmits the available time information to the communication module;
and the communication module transmits the information of the available time of the energy storage module to the power grid end.
Optionally, the detection module includes a state of charge detection sub-module, a charge-discharge depth detection sub-module, a voltage detection sub-module, a current detection sub-module, a temperature detection sub-module and a power detection sub-module, where the state of charge detection sub-module, the charge-discharge depth detection sub-module, the voltage detection sub-module, the current detection sub-module, the temperature detection sub-module and the power detection sub-module are all connected with the control module in a communication manner;
the charge state detection submodule is used for outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state and energy storage module at sub-discharge +.>Information of the charge state in secondary discharging is transmitted to the control module;
the charge and discharge depth detection sub-module is used for outputting the first energy storage moduleSecondary charging depth and energy storage module->Information of the secondary discharge depth is transmitted to the control module;
the voltage detection submodule is used for outputting the first energy storage moduleMaximum voltage at secondary charge and dischargeThe information is transmitted to the control module;
the current detection submodule is used for outputting the first energy storage moduleThe information of the maximum current value during secondary charge and discharge is transmitted to the control module;
the temperature detection submodule is used for outputting the first energy storage moduleInformation of the maximum temperature during secondary charge and discharge is transmitted to the control module;
the power detection submodule is used for outputting an energy storage modulePower and energy storage module>And information of power in secondary discharge is transmitted to the control module.
Optionally, when the control module calculates the actual charge-discharge cycle coefficient of the energy storage module, the following formula is satisfied:
；
；
；
；
wherein,for the actual charge-discharge cycle coefficient of the energy storage module, +.>Is the total number of charge and discharge cycles, wherein charge and discharge are carried out once for one cycle, +.>For the state of charge coefficient of the energy storage module, +.>For the depth coefficient of charge and discharge of the energy storage module, +.>Operating a reference coefficient for the energy storage module, ">As a maximum function>As a function of the minimum value +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-discharge, +.>Energy storage module no->The state of charge at the time of the secondary discharge; the said lotusThe electric state is preferably the ratio of the residual electric quantity of the energy storage module to the electric quantity when the energy storage module is fully charged;
the state of charge weight index of the energy storage module;
for the weight index of the depth of charge and discharge of the energy storage module, +.>Energy storage module no->Secondary charge depth,/->Energy storage module no->Secondary depth of discharge;
running a reference weight index for the energy storage module, +.>Energy storage module no->Maximum voltage during secondary charge and discharge, +.>Energy storage module no->Maximum current value during secondary charge and discharge, +.>Energy storage module no->Maximum temperature at the time of secondary charge and discharge.
Optionally, when the control module calculates the loss coefficient of the energy storage module, the following formula is satisfied:
；
wherein,for the loss factor of the energy storage module->For theoretical charge-discharge cycle times of the energy storage module, +.>Energy storage module no->Power at secondary charge, +.>Energy storage module no->Power at time of secondary discharge, < >>For single daily electricity consumption of all users, i.e. average single daily electricity consumption of all users in a preset time, for example, the preset time is one year (365 days), and the total electricity consumption of all users in the year is G,/day>=G/365。
Optionally, when the control module calculates the available time selection function of the energy storage module, the following formula is satisfied:
；
wherein,selecting a function for the time available for the energy storage module, < >>To->The threshold values are selected for the time available for the different energy storage modules. Specifically, when the loss coefficient of the energy storage module is larger, the available time of the corresponding energy storage module is longer.
Optionally, the system further comprises an alarm module, wherein the alarm module is in communication connection with the control module;
the preset information storage module is also used for storing information of the maximum theoretical capacity of the energy storage module, the rated capacity of the energy storage module and the total detection times and transmitting the information to the control module;
the detection module is also used for outputting an energy storage moduleThe information of the available capacity in secondary detection is transmitted to the control module;
the control module is used for controlling the energy storage module according to the theoretical capacity maximum value of the energy storage module, the loss coefficient of the energy storage module, the rated capacity of the energy storage module, the total detection times and the first energy storage moduleThe available capacity calculates the reference coefficient of the use state of the energy storage module during secondary detection, calculates alarm information according to the reference coefficient of the use state of the energy storage module and transmits the alarm information to the alarm module;
and the alarm module carries out alarm according to the alarm information.
Optionally, the detection module further includes a capacity detection sub-module, and the capacity detection sub-module is connected with the control module in a communication manner;
the capacity detection submodule is used for outputting the first energy storage moduleInformation of available capacity at time of secondary detectionAnd transmitting to the control module.
Optionally, when the control module calculates the reference coefficient of the use state of the energy storage module, the following formula is satisfied:
；
wherein,use of state reference coefficients for energy storage modules, +.>For maximum theoretical capacity of the energy storage module, < >>For the rated capacity of the energy storage module, < >>For detecting total times +.>The values of->Or->Or->When->When the energy storage module is rated as a superior product for staff, when +>When the energy storage module grade is rated as a qualified product, the working personnel is judged thatWhen the energy storage module is rated as defective product for staff, the energy storage module is rated as defective product for staff>Energy storage module no->Capacity available at the time of detection.
Optionally, when the control module calculates the alarm information, the following formula is satisfied:
；
wherein,for alarm information->Using a selection function of state reference coefficients for the energy storage module whenWhen the energy storage module is used normally, no alarm is needed, and when +.>When the energy storage module is abnormally used, an alarm is required.
The problem that the available time of the energy storage module cannot be estimated by a traditional micro-grid hybrid energy storage system is solved, therefore, the control module calculates the available time selection function of the energy storage module according to the related information, obtains the information of the available time of the energy storage module according to the available time selection function of the energy storage module and transmits the information to the communication module, the available time of the energy storage module can be checked by a power grid end, and a worker continuously observes the working state of the energy storage module at a critical time point or replaces the energy storage module in advance, so that the system always continuously and stably works.
In addition, when the loss coefficient of the energy storage module is calculated, the single daily electricity consumption of all users is considered, so that the calculated available time of the energy storage module is more in line with the actual situation.
Finally, an alarm module is additionally arranged, when the energy storage module is abnormal in use, the alarm module immediately gives an alarm, and at the moment, staff can make a corresponding scheme according to relevant parameters, and the energy storage module can be protected to a greater extent.
The invention also provides a micro-grid hybrid energy storage method, and the micro-grid hybrid energy storage system comprises the following steps:
s1: the power generation module converts energy and transmits the energy to the energy storage module, and the micro-grid integrated module controls the energy transmission;
s2: the information storage module is used for storing the information of the total number of charge and discharge cycles, the weight index of the charge state of the energy storage module, the weight index of the charge and discharge depth of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single daily electric quantity of all users, and transmitting the information to the control module;
s3: the detection module detects the energy storage module and outputs the first energy storage moduleCharge state during secondary charging and energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
s4: the control module calculates an available time selection function of the energy storage module according to the related information, obtains the available time information of the energy storage module according to the available time selection function of the energy storage module and transmits the available time information to the communication module;
s5: and the communication module transmits the information of the available time of the energy storage module to the power grid end.
The method has the advantages that the steps are simple, the operation is convenient, the information of the available time of the energy storage module can be checked at any time through the power grid end, and the method is convenient.
Embodiment two: the present embodiment, which includes the whole content of the first embodiment, provides a micro-grid hybrid energy storage system, which is shown in fig. 4 and 5.
The preset information storage module is also used for storing information of the alarm error coefficient and transmitting the information to the control module;
the alarm module is also used for counting the alarm times and transmitting the alarm times to the control module;
the control module calculates the quality coefficient of the energy storage module according to the alarming times, the alarming error coefficient and the available time selection function of the energy storage module, calculates the quality information of the energy storage module according to the quality coefficient of the energy storage module and transmits the quality information to the communication module;
and the communication module transmits the quality information of the energy storage module to the power grid end.
The alarm module comprises an alarm sub-module and a statistics sub-module, and the alarm sub-module and the statistics sub-module are both in communication connection with the control module;
the alarm submodule carries out alarm according to the alarm information;
the statistics submodule is used for counting the alarm times and transmitting the alarm times to the control module.
When the control module calculates the mass coefficient of the energy storage module, the following formula is satisfied:
；
wherein,for the mass coefficient of the energy storage module, < >>For alarming times, the person is in charge of>Is an alarm error coefficient.
When the control module calculates the quality information of the energy storage module, the following formula is satisfied:
；
wherein,for the energy storage module quality information, < >>As a selection function of the mass coefficient of the energy storage moduleThe energy storage module has the general mass when +.>The quality of the energy storage module is better.
The alarming submodule carries out alarming according to alarming information, can prompt the quality of the energy storage module corresponding to the staff to be problematic in time, the staff can feed information back to the production department, and the production department can carry out corresponding adjustment.
The quality problem that the traditional micro-grid hybrid energy storage system cannot judge in the use process of the energy storage module is solved, so that the control module in the embodiment calculates the quality coefficient of the energy storage module through the alarming times, the alarming error coefficient and the available time selection function of the energy storage module, calculates the quality information of the energy storage module according to the quality coefficient of the energy storage module and transmits the quality information to the communication module, the communication module can reflect the quality of the energy storage module, workers can feed back the information to the production department, and the production department can make corresponding adjustment.
The foregoing disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by the application of the present invention and the accompanying drawings are included in the scope of the invention, and in addition, the elements in the invention can be updated with the technical development.
Claims (10)
1. The micro-grid hybrid energy storage system is characterized by comprising a power generation module, an energy storage module, a micro-grid integration module, a preset information storage module, a detection module, a control module and a communication module;
the power generation module is in communication connection with the energy storage module and is used for converting energy and transmitting the energy to the energy storage module;
the micro-grid integrated module is in communication connection with the power generation module and the energy storage module, and is used for controlling energy transmission;
the preset information storage module is in communication connection with the control module, and is used for storing the information of the total number of charge and discharge cycles, the charge state weight index of the energy storage module, the charge and discharge depth weight index of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single-use electric quantity of all users, and transmitting the information to the control module;
the detection modules are all in communication connection with the energy storage module and the control module, and are used for detecting the energy storage module and outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
the control module is in communication connection with the communication module, calculates an available time selection function of the energy storage module according to the related information, obtains available time information of the energy storage module according to the available time selection function of the energy storage module, and transmits the available time information to the communication module;
and the communication module transmits the information of the available time of the energy storage module to the power grid end.
2. The micro-grid hybrid energy storage system of claim 1, wherein the detection module comprises a state of charge detection sub-module, a charge-discharge depth detection sub-module, a voltage detection sub-module, a current detection sub-module, a temperature detection sub-module, and a power detection sub-module, all communicatively connected to the control module;
the charge state detection submodule is used for outputting the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state and energy storage module at sub-discharge +.>Information of the charge state in secondary discharging is transmitted to the control module;
the charge and discharge depth detection sub-module is used for outputting the first energy storage moduleSecondary charging depth and energy storage module->Information of the secondary discharge depth is transmitted to the control module;
the voltage detection submodule is used for outputting the first energy storage moduleThe information of the maximum voltage value during secondary charge and discharge is transmitted to the control module;
the current detection submodule is used for outputting the first energy storage moduleThe information of the maximum current value during secondary charge and discharge is transmitted to the control module;
the temperature detection submodule is used for outputting the first energy storage moduleInformation of the maximum temperature during secondary charge and discharge is transmitted to the control module;
the power detection submodule is used for outputting an energy storage modulePower and energy storage module>And information of power in secondary discharge is transmitted to the control module.
3. The micro-grid hybrid energy storage system of claim 2, wherein the control module calculates the actual charge-discharge cycle coefficient of the energy storage module to satisfy the following equation:
；
；
；
；
wherein,for the actual charge-discharge cycle coefficient of the energy storage module, +.>Is the total number of charge and discharge cycles>For the state of charge coefficient of the energy storage module, +.>For the depth coefficient of charge and discharge of the energy storage module, +.>Operating a reference coefficient for the energy storage module, ">As a maximum function>As a function of the minimum value +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-charge, +.>Energy storage module no->Charge state at sub-discharge, +.>Energy storage module no->The state of charge at the time of the secondary discharge;
the state of charge weight index of the energy storage module;
for the weight index of the depth of charge and discharge of the energy storage module, +.>Energy storage module no->Secondary charge depth,/->Energy storage module no->Secondary depth of discharge;
running a reference weight index for the energy storage module, +.>Energy storage module no->The maximum voltage at the time of secondary charge and discharge,energy storage module no->Maximum current value during secondary charge and discharge, +.>Energy storage module no->Maximum temperature at the time of secondary charge and discharge.
4. A micro-grid hybrid energy storage system according to claim 3, wherein the control module, when calculating the energy storage module loss factor, satisfies the following equation:
；
wherein,for the loss factor of the energy storage module->For theoretical charge-discharge cycle times of the energy storage module, +.>Energy storage module no->Power at secondary charge, +.>Energy storage module no->Power at time of secondary discharge, < >>And the electricity is used for all users singly.
5. The micro-grid hybrid energy storage system of claim 4, wherein the control module calculates the energy storage module availability time selection function to satisfy the following equation:
；
wherein,selecting a function for the time available for the energy storage module, < >>To->The threshold values are selected for the time available for the different energy storage modules.
6. The micro-grid hybrid energy storage system of claim 5, further comprising an alarm module communicatively coupled to the control module;
the preset information storage module is also used for storing information of the maximum theoretical capacity of the energy storage module, the rated capacity of the energy storage module and the total detection times and transmitting the information to the control module;
the detection module is also used for outputting an energy storage moduleAvailable capacity at secondary detectionIs transmitted to the control module;
the control module is used for controlling the energy storage module according to the theoretical capacity maximum value of the energy storage module, the loss coefficient of the energy storage module, the rated capacity of the energy storage module, the total detection times and the first energy storage moduleThe available capacity calculates the reference coefficient of the use state of the energy storage module during secondary detection, calculates alarm information according to the reference coefficient of the use state of the energy storage module and transmits the alarm information to the alarm module;
and the alarm module carries out alarm according to the alarm information.
7. The micro-grid hybrid energy storage system of claim 6, wherein said detection module further comprises a capacity detection sub-module, said capacity detection sub-module being communicatively coupled to the control module;
the capacity detection submodule is used for outputting the first energy storage moduleAnd information of the available capacity in the secondary detection is transmitted to the control module.
8. The micro-grid hybrid energy storage system of claim 7, wherein the control module calculates the energy storage module usage state reference factor to satisfy the following equation:
；
wherein,use of state reference coefficients for energy storage modules, +.>For maximum theoretical capacity of the energy storage module, < >>For the rated capacity of the energy storage module, < >>For detecting total times +.>The values of->Or->Or->When->When the energy storage module is rated as a superior product for staff, when +>When the energy storage module grade is rated as a qualified product, the working personnel is judged thatWhen the energy storage module is rated as defective product for staff, the energy storage module is rated as defective product for staff>Energy storage module no->Capacity available at the time of detection.
9. The micro-grid hybrid energy storage system of claim 8, wherein the control module calculates the alarm information to satisfy the following equation:
；
wherein,for alarm information->Use of a selection function of the state reference coefficients for the energy storage module, when +.>When the energy storage module is used normally, no alarm is needed, and when +.>When the energy storage module is abnormally used, an alarm is required.
10. A micro-grid hybrid energy storage method, characterized by applying a micro-grid hybrid energy storage system according to any of claims 1 to 9, comprising the steps of:
s1: the power generation module converts energy and transmits the energy to the energy storage module, and the micro-grid integrated module controls the energy transmission;
s2: the information storage module is used for storing the information of the total number of charge and discharge cycles, the weight index of the charge state of the energy storage module, the weight index of the charge and discharge depth of the energy storage module, the operation reference weight index of the energy storage module, the theoretical charge and discharge cycle times of the energy storage module and the single daily electric quantity of all users, and transmitting the information to the control module;
s3: the detection module detects the energy storage module and outputs the first energy storage moduleCharge state during secondary charging, energy storage module +.>Charge state during secondary charging, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Charge state at sub-discharge, energy storage module +.>Secondary charging depth, energy storage module->Secondary depth of discharge, energy storage module->Maximum voltage during secondary charge and discharge, energy storage module +.>Maximum current value during secondary charge and discharge, energy storage module +.>Maximum temperature during secondary charge and discharge, energy storage module ∈>Power and energy storage module>The information of the power in secondary discharge is transmitted to the control module;
s4: the control module calculates an available time selection function of the energy storage module according to the related information, obtains the available time information of the energy storage module according to the available time selection function of the energy storage module and transmits the available time information to the communication module;
s5: and the communication module transmits the information of the available time of the energy storage module to the power grid end.
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