CN109066749B - Energy management system applied to photovoltaic energy storage system - Google Patents

Energy management system applied to photovoltaic energy storage system Download PDF

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CN109066749B
CN109066749B CN201811056749.2A CN201811056749A CN109066749B CN 109066749 B CN109066749 B CN 109066749B CN 201811056749 A CN201811056749 A CN 201811056749A CN 109066749 B CN109066749 B CN 109066749B
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battery
charging
current
temperature
discharging
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CN109066749A (en
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张华�
马保军
翟新军
唐永刚
王朋辉
胥勇
杨健
张磊
俞美英
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CGN solar Yingjisha Co., Ltd
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Cgn Solar Yingjisha Co Ltd
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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
    • H02J3/383—
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an energy management system applied to a photovoltaic energy storage system, which comprises a battery state monitoring module, a charging and discharging statistical module, an equilibrium degree detection and control module, a battery database, a battery management server and a display and control terminal, wherein the management server is respectively connected with the battery state monitoring module, the charging and discharging statistical module, the equilibrium degree detection and control module, the battery database and the display and control terminal. According to the invention, the battery state monitoring module, the charging and discharging statistical module and the balance degree detection and control module are combined with the battery management server to obtain the values of the surface temperature, the charging and discharging current and the battery capacity and the terminal voltage of the battery, the battery life evaluation coefficient is counted according to the obtained information, and the counted battery life evaluation coefficient is sent to the display and control terminal, so that a manager can visually know the service life of the battery conveniently, and the service life of the battery and the power supply balance of the photovoltaic energy storage system are greatly improved.

Description

Energy management system applied to photovoltaic energy storage system
Technical Field
The invention belongs to the technical field of photovoltaic energy storage, and relates to an energy management system applied to a photovoltaic energy storage system.
Background
The photovoltaic power generation system is a power generation system which directly converts light energy into electric energy without a thermal process, and main components of the photovoltaic power generation system are a solar cell, a storage battery, a controller and an inverter.
The battery is also photovoltaic energy storage system, the battery is used for saving the direct current of solar cell conversion, be energy storage center, current photovoltaic energy storage system is easily influenced by natural factors such as illumination, temperature, its output is unstable, intermittent type nature is big, there is the unbalanced phenomenon of power supply, simultaneously, after the battery installation is accomplished, can't know the temperature on battery surface, the influence that electric current etc. caused to the battery use, the life of battery has seriously been influenced, be not convenient for manage the battery energy, and simultaneously, the staff can't know the timely change battery of life of battery, influence photovoltaic system's normal operating, in order to solve above problem, the current design is applied to photovoltaic energy storage system's energy management system.
Disclosure of Invention
The invention aims to provide an energy management system applied to a photovoltaic energy storage system, which solves the problems of poor battery power supply balance and poor management efficiency in the battery management process of the conventional photovoltaic energy storage system, and the problem that the service life of a battery cannot be effectively evaluated.
The purpose of the invention can be realized by the following technical scheme:
the energy management system applied to the photovoltaic energy storage system comprises a battery state monitoring module, a charging and discharging statistical module, an equilibrium degree detection and control module, a battery database, a battery management server and a display and control terminal, wherein the battery management server is respectively connected with the battery state monitoring module, the charging and discharging statistical module, the equilibrium degree detection and control module, the battery database and the display and control terminal;
the battery state monitoring module is used for monitoring the current electric quantity of the battery and the temperature of the surface of the battery in real time and sending the monitored current electric quantity of the battery and the temperature of the surface of the battery to the battery management server;
the charging and discharging statistical module is used for counting the working state of the battery in real time, judging the current information of the battery during charging or discharging, correspondingly counting the charging or discharging accumulated time, and sending the working state of the battery and the counted time to the battery management server;
the battery management system comprises an equalization degree detection and control module and a battery management server, wherein the equalization degree detection and control module is in bidirectional connection with the battery management server and is used for acquiring the capacity in the battery and the terminal voltages at two ends of the battery in real time, transmitting the received capacity in the battery and the terminal voltages at two ends of the battery to the battery management server and receiving a battery equalization degree regulation and control instruction transmitted by the battery management server so as to reduce the difference value between the battery capacity and the terminal voltage of the battery;
the battery database is used for storing basic information of a load connected with the battery, a set standard temperature threshold value of the surface of the battery and the maximum current of the battery during charging and discharging, the temperature exceeding the standard temperature threshold value is different, the danger coefficients corresponding to the different exceeding temperatures are different, the higher the exceeding temperature is, the higher the danger coefficient corresponding to the exceeding temperature is, and the basic information of the load comprises the rated voltage, the rated current, the rated power and the like of the load;
the battery management server receives the current electric quantity of the battery and the temperature of the surface of the battery sent by the battery state monitoring module, whether the current electric quantity of the received battery is smaller than the lowest discharge electric quantity of the battery is judged, if so, the battery management server sends a control instruction to the display and control terminal to control the battery not to provide electric quantity for the load, divides the temperature of the surface of the received battery according to the collected time periods T, counts the average temperature of the surface of the battery in each time period to form a time period temperature set W (W1, W2.., wh), wh is expressed as the average temperature of the surface of the battery in the h-th time period, compares the average temperature of the surface of the battery in each time period with a standard temperature threshold value of a battery standard stored in a battery database one by one to obtain a time period temperature comparison set W '(W' 1, W '2.,. W' h), w 'h is represented as a comparison value of the average temperature of the surface of the battery in the h-th time period and a set standard temperature threshold of the surface of the battery, if the average temperature of the surface of the battery in the h-th time period is smaller than the set standard temperature threshold of the surface of the battery, w' h is 0, otherwise w 'h is 1, a temperature danger coefficient set KW' (KW '1, KW' 2,.,. KW 'h) is obtained by comparing the temperature comparison values in the time periods in a time period temperature comparison set with danger coefficients corresponding to different temperatures stored in a database of the battery, KW' h is represented as a danger coefficient corresponding to the comparison value of the average temperature of the surface of the battery in the h-th time period and the set standard temperature threshold of the surface of the battery, the battery management server compares the average temperature of the surface of the battery in each time period with the average temperature in the next time period in the time period temperature comparison set and counts the change rate of the temperature in the time period T, obtaining a temperature change rate set Δ W (Δ W1, Δ W2., Δ W (h-1)), wherein Δ W (h-1) is expressed as the change rate of the average temperature in the h-th time period and the average temperature in the h-1 th time period;
the battery management server receives the charging current, the charging time, the discharging current and the discharging time of the battery sent by the charging and discharging statistical module, comparing the received charging current and discharging current with a set charging current threshold and a set discharging current threshold respectively, if the charging current is less than the charging current threshold and the discharging current is less than the discharging current threshold, the battery management server counts the amount of power consumed by the load per unit time based on the basic information of the load connected to the battery stored in the battery database, and counting the charged electric quantity of the battery in unit time according to the charging current and the charging time of the battery, if the charging current is less than the charging current threshold or the discharging current is less than the discharging current threshold, the battery management server sends a control instruction to the display and control terminal, controlling and adjusting the current exceeding the current threshold value to ensure that the charging current is smaller than the charging current threshold value and the discharging current is smaller than the discharging current threshold value;
the battery management server receives the capacity in the battery and the terminal voltages at two ends of the battery which are sent by the balance degree detection and control module in real time, judges the numerical values of the content of the battery and the terminal voltages at two ends of the battery, and sends a balance degree regulation and control instruction to the balance degree detection and control module if the content of the battery is different from the numerical values of the terminal voltages at two ends of the battery so as to reduce the difference value between the capacity of the battery and the terminal voltages of the battery;
meanwhile, the battery management server counts a battery life evaluation coefficient according to a time period temperature comparison set W ', a temperature danger coefficient set KW', a temperature change rate set delta W, whether the charging and discharging current exceeds a set current threshold value and a difference value between the battery content and terminal voltage values at two ends of the battery, and sends the counted battery life evaluation coefficient to the display and control terminal;
the display and control terminal is used for receiving and displaying the battery life evaluation coefficient sent by the battery management server, receiving a current control instruction and a battery output control instruction sent by the battery management server, and respectively controlling the current exceeding a current threshold and the battery capacity being less than the lowest discharge capacity.
Furthermore, the battery state monitoring module comprises an electric quantity acquisition unit, a temperature acquisition unit and a first processor, wherein the first processor is respectively connected with the electric quantity acquisition unit, the temperature acquisition unit, the discharge statistical unit and the timing unit;
the electric quantity acquisition unit is used for acquiring the electric quantity in the energy storage battery in real time and sending the counted current electric quantity of the battery to the first processor; the temperature acquisition unit is a temperature sensor and is used for acquiring the temperature of the surface of the battery in real time and sending the acquired temperature of the surface of the battery to the first processor; the first processor receives the current electric quantity of the battery sent by the electric quantity acquisition unit, receives the temperature of the surface of the battery sent by the temperature acquisition unit, and sends the received current electric quantity of the battery and the received temperature of the surface of the battery to the battery management server.
Furthermore, the charging and discharging statistical module comprises a discharging statistical unit, a discharging timing unit, a charging statistical unit, a charging timing unit and a second processor, and the second processor is respectively connected with the discharging statistical unit, the discharging timing unit, the charging statistical unit and the charging timing unit;
the discharge counting unit is used for judging whether the battery is in a discharge state or not, counting the current in a battery discharge loop if the battery is in the discharge state, and sending the current information of battery discharge to the second processor, and the discharge timing unit is used for accumulating the battery discharge time and sending the accumulated battery discharge time to the second processor; the charging statistical unit is used for judging whether the battery is in a charging state or not, counting the current in the battery charging loop if the battery is in the charging state, and sending the current information in the battery charging loop to the second processor; the charging timing unit is used for accumulating the charging time of the battery and sending the accumulated charging time of the battery to the second processor; the second processor is used for receiving the current information of battery discharging sent by the discharging statistical unit, receiving the discharging time sent by the discharging timing unit, receiving the current information of battery charging sent by the charging statistical unit, receiving the charging time sent by the charging timing unit, and sending the received battery discharging current, discharging time, charging current and charging time to the battery management server.
Furthermore, the balance degree detection and control module comprises a battery capacity acquisition unit, a battery terminal voltage detection unit and a balance regulation and control unit, wherein the battery capacity acquisition unit is used for acquiring the capacity in the battery in real time and sending the acquired battery capacity to the battery management server, the battery terminal voltage detection unit is used for acquiring the terminal voltages at two ends of the battery in real time and sending the terminal voltages at two ends of the battery to the battery management server, and meanwhile, the balance regulation and control unit is used for receiving a battery balance degree regulation and control instruction sent by the battery management server and regulating the battery capacity so as to reduce the difference between the battery capacity and the battery terminal voltage and prolong the service life of the battery.
Further, the battery life evaluation coefficient is calculated by the formula
Figure GDA0002397578550000051
w 'h is the contrast value of the average temperature of the surface of the battery in the h time period and the set standard temperature threshold value of the surface of the battery, kw' h is the danger coefficient corresponding to the contrast value of the average temperature of the surface of the battery in the h time period and the set standard temperature threshold value of the surface of the battery, Δ w (h-1) is the change rate of the average temperature in the h time period and the average temperature in the h-1 time period, and Δ ICharging deviceExpressed as the value of the battery charging current exceeding the charging current threshold, Δ IPutExpressed as a value of the battery discharge current exceeding a discharge current threshold value, Δ I when the battery discharge current is less than a charge current threshold valueCharging deviceTaking 0, when the battery discharge current is less than the value of the charging current threshold value, Delta IPutTaking 0, Δ U represents the difference between the battery internal capacity and the terminal voltage values at both ends of the battery.
The invention has the beneficial effects that:
the energy management system applied to the photovoltaic energy storage system can detect the relation between the electric quantity of the battery and the terminal voltages at two ends of the battery in real time through the balance degree detection and control module, is convenient to reduce the unbalance of the battery and prolong the service life of the battery, obtains the values of the surface temperature, the charging and discharging current, the battery capacity and the terminal voltages through the battery state monitoring module, the charging and discharging statistical module and the balance degree detection and control module and combining with the battery management server, calculates the battery service life evaluation coefficient according to the obtained information, and sends the calculated battery service life evaluation coefficient to the display and control terminal, so that managers can visually know the service life of the battery, the energy management efficiency of the battery is improved, and the service life of the battery and the balance of the power supply of the photovoltaic energy storage system are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an energy management system applied to a photovoltaic energy storage system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an energy management system applied to a photovoltaic energy storage system includes a battery state monitoring module, a charging and discharging statistical module, an equalization degree detection and control module, a battery database, a battery management server and a display and control terminal, wherein the battery management server is respectively connected with the battery state monitoring module, the charging and discharging statistical module, the equalization degree detection and control module, the battery database and the display and control terminal;
the battery state monitoring module is used for monitoring the current electric quantity of the battery and the temperature of the surface of the battery in real time and sending the monitored current electric quantity of the battery and the temperature of the surface of the battery to the battery management server;
the battery state monitoring module comprises an electric quantity acquisition unit, a temperature acquisition unit and a first processor, wherein the first processor is respectively connected with the electric quantity acquisition unit, the temperature acquisition unit, the discharge statistical unit and the timing unit, and the electric quantity acquisition unit is used for acquiring the electric quantity in the energy storage battery in real time and sending the statistical current electric quantity of the battery to the first processor; the temperature acquisition unit is a temperature sensor and is used for acquiring the temperature of the surface of the battery in real time and sending the acquired temperature of the surface of the battery to the first processor; the first processor receives the current electric quantity of the battery sent by the electric quantity acquisition unit, receives the temperature of the surface of the battery sent by the temperature acquisition unit, and sends the received current electric quantity of the battery and the received temperature of the surface of the battery to the battery management server;
the charging and discharging statistical module is used for counting the working state of the battery in real time, judging the current information of the battery during charging or discharging, correspondingly counting the charging or discharging accumulated time, and sending the working state of the battery and the counted time to the battery management server;
the charging and discharging statistical module comprises a discharging statistical unit, a discharging timing unit, a charging statistical unit, a charging timing unit and a second processor, the second processor is respectively connected with the discharging statistical unit, the discharging timing unit, the charging statistical unit and the charging timing unit, the discharging statistical unit is used for judging whether the battery is in a discharging state, if the battery is in the discharging state, the current in a battery discharging loop is counted, the discharging current information of the battery is sent to the second processor, and the discharging timing unit is used for accumulating the discharging time of the battery and sending the accumulated discharging time of the battery to the second processor; the charging statistical unit is used for judging whether the battery is in a charging state or not, counting the current in the battery charging loop if the battery is in the charging state, and sending the current information in the battery charging loop to the second processor; the charging timing unit is used for accumulating the charging time of the battery and sending the accumulated charging time of the battery to the second processor; the second processor is used for receiving the current information of battery discharge sent by the discharge statistical unit, receiving the discharge time sent by the discharge timing unit, receiving the current information of battery charge sent by the charge statistical unit, receiving the charge time sent by the charge timing unit, and sending the received battery discharge current, discharge time, charge current and charge time to the battery management server;
the battery management system comprises an equalization degree detection and control module and a battery management server, wherein the equalization degree detection and control module is in bidirectional connection with the battery management server and is used for acquiring the capacity in the battery and the terminal voltages at two ends of the battery in real time, transmitting the received capacity in the battery and the terminal voltages at two ends of the battery to the battery management server and receiving a battery equalization degree regulation and control instruction transmitted by the battery management server so as to reduce the difference value between the battery capacity and the terminal voltage of the battery;
the battery capacity acquisition unit is used for acquiring the capacity in the battery in real time and sending the acquired battery capacity to the battery management server, the battery terminal voltage detection unit is used for acquiring the terminal voltages at two ends of the battery in real time and sending the terminal voltages at two ends of the battery to the battery management server, and meanwhile, the balance regulation and control unit is used for receiving a battery balance regulation and control instruction sent by the battery management server and regulating the battery capacity so as to reduce the difference between the battery capacity and the battery terminal voltage and improve the service life of the battery;
the battery database is used for storing basic information of a load connected with the battery, a set standard temperature threshold value of the surface of the battery and the maximum current of the battery during charging and discharging, the temperature exceeding the standard temperature threshold value is different, the danger coefficients corresponding to the different exceeding temperatures are different, the higher the exceeding temperature is, the higher the danger coefficient corresponding to the exceeding temperature is, and the basic information of the load comprises the rated voltage, the rated current, the rated power and the like of the load;
the battery management server receives the current electric quantity of the battery and the temperature of the surface of the battery sent by the battery state monitoring module, whether the current electric quantity of the received battery is smaller than the lowest discharge electric quantity of the battery is judged, if so, the battery management server sends a control instruction to the display and control terminal to control the battery not to provide electric quantity for the load, divides the temperature of the surface of the received battery according to the collected time periods T, counts the average temperature of the surface of the battery in each time period to form a time period temperature set W (W1, W2.., wh), wh is expressed as the average temperature of the surface of the battery in the h-th time period, compares the average temperature of the surface of the battery in each time period with a standard temperature threshold value of a battery standard stored in a battery database one by one to obtain a time period temperature comparison set W '(W' 1, W '2.,. W' h), w 'h is represented as a comparison value of the average temperature of the surface of the battery in the h-th time period and a set standard temperature threshold of the surface of the battery, if the average temperature of the surface of the battery in the h-th time period is smaller than the set standard temperature threshold of the surface of the battery, w' h is 0, otherwise w 'h is 1, a temperature danger coefficient set KW' (KW '1, KW' 2,.,. KW 'h) is obtained by comparing the temperature comparison values in the time periods in a time period temperature comparison set with danger coefficients corresponding to different temperatures stored in a database of the battery, KW' h is represented as a danger coefficient corresponding to the comparison value of the average temperature of the surface of the battery in the h-th time period and the set standard temperature threshold of the surface of the battery, the battery management server compares the average temperature of the surface of the battery in each time period with the average temperature in the next time period in the time period temperature comparison set and counts the change rate of the temperature in the time period T, obtaining a temperature change rate set Δ W (Δ W1, Δ W2., Δ W (h-1)), wherein Δ W (h-1) is expressed as the change rate of the average temperature in the h-th time period and the average temperature in the h-1 th time period;
the battery management server receives the charging current, the charging time, the discharging current and the discharging time of the battery sent by the charging and discharging statistical module, comparing the received charging current and discharging current with a set charging current threshold and a set discharging current threshold respectively, if the charging current is less than the charging current threshold and the discharging current is less than the discharging current threshold, the battery management server counts the amount of power consumed by the load per unit time based on the basic information of the load connected to the battery stored in the battery database, and counting the charged electric quantity of the battery in unit time according to the charging current and the charging time of the battery, if the charging current is less than the charging current threshold or the discharging current is less than the discharging current threshold, the battery management server sends a control instruction to the display and control terminal, controlling and adjusting the current exceeding the current threshold value to ensure that the charging current is smaller than the charging current threshold value and the discharging current is smaller than the discharging current threshold value;
the battery management server receives the capacity in the battery and the terminal voltages at two ends of the battery which are sent by the balance degree detection and control module in real time, judges the numerical values of the content of the battery and the terminal voltages at two ends of the battery, and sends a balance degree regulation and control instruction to the balance degree detection and control module if the content of the battery is different from the numerical values of the terminal voltages at two ends of the battery so as to reduce the difference value between the capacity of the battery and the terminal voltages of the battery;
meanwhile, the battery management server counts the battery life evaluation coefficient according to a time period temperature comparison set W ', a temperature danger coefficient set KW', a temperature change rate set delta W, whether the charging and discharging current exceeds a set current threshold value and the difference value between the battery content and the terminal voltage values at two ends of the battery, wherein the calculation formula of the battery life evaluation coefficient is
Figure GDA0002397578550000111
w 'h is expressed as the comparison value of the average temperature of the surface of the battery in the h period and the set standard temperature threshold value of the surface of the battery, and kw' h is expressed as the h periodThe danger coefficient corresponding to the contrast value of the average temperature of the surface of the battery in the section and the set standard temperature threshold value of the surface of the battery is expressed as delta w (h-1) and is the change rate of the average temperature in the h time section and the average temperature in the h-1 time section, and delta ICharging deviceExpressed as the value of the battery charging current exceeding the charging current threshold, Δ IPutExpressed as a value of the battery discharge current exceeding a discharge current threshold value, Δ I when the battery discharge current is less than a charge current threshold valueCharging deviceTaking 0, when the battery discharge current is less than the value of the charging current threshold value, Delta IPutTaking 0, wherein delta U is the difference between the battery content and the terminal voltage values at two ends of the battery, the higher the battery life evaluation coefficient is, the higher the usable life of the battery is, and the battery management server sends the counted battery life evaluation coefficient to the display and control terminal;
the display and control terminal is used for receiving and displaying the battery life evaluation coefficient sent by the battery management server, receiving a current control instruction and a battery output control instruction sent by the battery management server, wherein the current control instruction controls the current exceeding the current threshold value, so that the charging current is smaller than the charging current threshold value and the discharging current is smaller than the discharging current threshold value, and when the battery output control instruction is smaller than the lowest discharging electric quantity to the battery electric quantity, the battery is controlled not to supply power for the load.
The energy management system applied to the photovoltaic energy storage system can detect the relation between the electric quantity of the battery and the terminal voltages at two ends of the battery in real time through the balance degree detection and control module, is convenient to reduce the unbalance of the battery and prolong the service life of the battery, obtains the values of the surface temperature, the charging and discharging current, the battery capacity and the terminal voltages through the battery state monitoring module, the charging and discharging statistical module and the balance degree detection and control module and combining with the battery management server, calculates the battery service life evaluation coefficient according to the obtained information, and sends the calculated battery service life evaluation coefficient to the display and control terminal, so that managers can visually know the service life of the battery, the energy management efficiency of the battery is improved, and the service life of the battery and the balance of the power supply of the photovoltaic energy storage system are greatly improved.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.

Claims (4)

1. Be applied to photovoltaic energy storage system's energy management system, its characterized in that: the system comprises a battery state monitoring module, a charging and discharging statistical module, an equilibrium degree detection and control module, a battery database, a battery management server and a display and control terminal, wherein the battery management server is respectively connected with the battery state monitoring module, the charging and discharging statistical module, the equilibrium degree detection and control module, the battery database and the display and control terminal;
the battery state monitoring module is used for monitoring the current electric quantity of the battery and the temperature of the surface of the battery in real time and sending the monitored current electric quantity of the battery and the temperature of the surface of the battery to the battery management server;
the charging and discharging statistical module is used for counting the working state of the battery in real time, judging the current information of the battery during charging or discharging, correspondingly counting the charging or discharging accumulated time, and sending the working state of the battery and the counted time to the battery management server;
the battery management system comprises an equalization degree detection and control module and a battery management server, wherein the equalization degree detection and control module is in bidirectional connection with the battery management server and is used for acquiring the capacity in the battery and the terminal voltages at two ends of the battery in real time, transmitting the received capacity in the battery and the terminal voltages at two ends of the battery to the battery management server and receiving a battery equalization degree regulation and control instruction transmitted by the battery management server so as to reduce the difference value between the battery capacity and the terminal voltage of the battery;
the battery database is used for storing basic information of a load connected with the battery, a set standard temperature threshold value of the surface of the battery and the maximum current of the battery during charging and discharging, the temperature exceeding the standard temperature threshold value is different, the danger coefficients corresponding to the different exceeding temperatures are different, the higher the exceeding temperature is, the higher the danger coefficient corresponding to the exceeding temperature is, and the basic information of the load comprises the rated voltage, the rated current, the rated power and the like of the load;
the battery management server receives the current electric quantity of the battery and the temperature of the surface of the battery sent by the battery state monitoring module, whether the current electric quantity of the received battery is smaller than the lowest discharge electric quantity of the battery is judged, if so, the battery management server sends a control instruction to the display and control terminal to control the battery not to provide electric quantity for the load, divides the temperature of the surface of the received battery according to the collected time periods T, counts the average temperature of the surface of the battery in each time period to form a time period temperature set W (W1, W2.., wh), wh is expressed as the average temperature of the surface of the battery in the h-th time period, compares the average temperature of the surface of the battery in each time period with a standard temperature threshold value of a battery standard stored in a battery database one by one to obtain a time period temperature comparison set W '(W' 1, W '2.,. W' h), w 'h is represented as a comparison value of the average temperature of the surface of the battery in the h-th time period and a set standard temperature threshold of the surface of the battery, if the average temperature of the surface of the battery in the h-th time period is smaller than the set standard temperature threshold of the surface of the battery, w' h is 0, otherwise w 'h is 1, a temperature danger coefficient set KW' (KW '1, KW' 2,.,. KW 'h) is obtained by comparing the temperature comparison values in the time periods in a time period temperature comparison set with danger coefficients corresponding to different temperatures stored in a database of the battery, KW' h is represented as a danger coefficient corresponding to the comparison value of the average temperature of the surface of the battery in the h-th time period and the set standard temperature threshold of the surface of the battery, the battery management server compares the average temperature of the surface of the battery in each time period with the average temperature in the next time period in the time period temperature comparison set and counts the change rate of the temperature in the time period T, obtaining a temperature change rate set Δ W (Δ W1, Δ W2., Δ W (h-1)), wherein Δ W (h-1) is expressed as the change rate of the average temperature in the h-th time period and the average temperature in the h-1 th time period;
the battery management server receives the charging current, the charging time, the discharging current and the discharging time of the battery sent by the charging and discharging statistical module, comparing the received charging current and discharging current with a set charging current threshold and a set discharging current threshold respectively, if the charging current is less than the charging current threshold and the discharging current is less than the discharging current threshold, the battery management server counts the amount of power consumed by the load per unit time based on the basic information of the load connected to the battery stored in the battery database, and counting the charged electric quantity of the battery in unit time according to the charging current and the charging time of the battery, if the charging current is less than the charging current threshold or the discharging current is less than the discharging current threshold, the battery management server sends a control instruction to the display and control terminal, controlling and adjusting the current exceeding the current threshold value to ensure that the charging current is smaller than the charging current threshold value and the discharging current is smaller than the discharging current threshold value;
the battery management server receives the capacity in the battery and the terminal voltages at two ends of the battery which are sent by the balance degree detection and control module in real time, judges the numerical values of the content of the battery and the terminal voltages at two ends of the battery, and sends a balance degree regulation and control instruction to the balance degree detection and control module if the content of the battery is different from the numerical values of the terminal voltages at two ends of the battery so as to reduce the difference value between the capacity of the battery and the terminal voltages of the battery;
meanwhile, the battery management server counts a battery life evaluation coefficient according to a time period temperature comparison set W ', a temperature danger coefficient set KW', a temperature change rate set delta W, whether the charging and discharging current exceeds a set current threshold value and a difference value between the battery content and terminal voltage values at two ends of the battery, and sends the counted battery life evaluation coefficient to the display and control terminal;
the display and control terminal is used for receiving and displaying the battery life evaluation coefficient sent by the battery management server, receiving a current control instruction and a battery output control instruction sent by the battery management server, and respectively controlling the current exceeding a current threshold and the battery electric quantity being less than the lowest discharge electric quantity;
the battery life evaluation coefficient calculation formula is
Figure FDA0002397578540000031
w′h is the contrast value of the average temperature of the surface of the battery in the h time period and the set standard temperature threshold value of the surface of the battery, kw' h is the danger coefficient corresponding to the contrast value of the average temperature of the surface of the battery in the h time period and the set standard temperature threshold value of the surface of the battery, Δ w (h-1) is the change rate of the average temperature in the h time period and the average temperature in the h-1 time period, and Δ ICharging deviceExpressed as the value of the battery charging current exceeding the charging current threshold, Δ IPutExpressed as a value of the battery discharge current exceeding a discharge current threshold, Δ I when the battery charge current is less than a charge current threshold valueCharging deviceTaking 0, when the discharge current of the battery is smaller than the discharge current threshold value, delta IPutTaking 0, Δ U represents the difference between the battery internal capacity and the terminal voltage values at both ends of the battery.
2. The energy management system applied to the photovoltaic energy storage system according to claim 1, wherein: the battery state monitoring module comprises an electric quantity acquisition unit, a temperature acquisition unit and a first processor, and the first processor is respectively connected with the electric quantity acquisition unit, the temperature acquisition unit, the discharge statistical unit and the timing unit;
the electric quantity acquisition unit is used for acquiring the electric quantity in the energy storage battery in real time and sending the counted current electric quantity of the battery to the first processor; the temperature acquisition unit is a temperature sensor and is used for acquiring the temperature of the surface of the battery in real time and sending the acquired temperature of the surface of the battery to the first processor; the first processor receives the current electric quantity of the battery sent by the electric quantity acquisition unit, receives the temperature of the surface of the battery sent by the temperature acquisition unit, and sends the received current electric quantity of the battery and the received temperature of the surface of the battery to the battery management server.
3. The energy management system applied to the photovoltaic energy storage system according to claim 1, wherein: the charging and discharging statistical module comprises a discharging statistical unit, a discharging timing unit, a charging statistical unit, a charging timing unit and a second processor, and the second processor is respectively connected with the discharging statistical unit, the discharging timing unit, the charging statistical unit and the charging timing unit;
the discharge counting unit is used for judging whether the battery is in a discharge state or not, counting the current in a battery discharge loop if the battery is in the discharge state, and sending the current information of battery discharge to the second processor, and the discharge timing unit is used for accumulating the battery discharge time and sending the accumulated battery discharge time to the second processor; the charging statistical unit is used for judging whether the battery is in a charging state or not, counting the current in the battery charging loop if the battery is in the charging state, and sending the current information in the battery charging loop to the second processor; the charging timing unit is used for accumulating the charging time of the battery and sending the accumulated charging time of the battery to the second processor; the second processor is used for receiving the current information of battery discharging sent by the discharging statistical unit, receiving the discharging time sent by the discharging timing unit, receiving the current information of battery charging sent by the charging statistical unit, receiving the charging time sent by the charging timing unit, and sending the received battery discharging current, discharging time, charging current and charging time to the battery management server.
4. The energy management system applied to the photovoltaic energy storage system according to claim 1, wherein: the battery capacity acquisition unit is used for acquiring the capacity in the battery in real time and sending the acquired battery capacity to the battery management server, the battery terminal voltage detection unit is used for acquiring the terminal voltages at two ends of the battery in real time and sending the terminal voltages at two ends of the battery to the battery management server, and meanwhile, the balance regulation and control unit is used for receiving a battery balance regulation and control instruction sent by the battery management server and regulating the battery capacity so as to reduce the difference between the battery capacity and the battery terminal voltage and prolong the service life of the battery.
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