CN116979671B - Charging and discharging safety management system of energy storage battery pack for wind-solar power generation - Google Patents
Charging and discharging safety management system of energy storage battery pack for wind-solar power generation Download PDFInfo
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- CN116979671B CN116979671B CN202311240056.XA CN202311240056A CN116979671B CN 116979671 B CN116979671 B CN 116979671B CN 202311240056 A CN202311240056 A CN 202311240056A CN 116979671 B CN116979671 B CN 116979671B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 255
- 238000010248 power generation Methods 0.000 title claims abstract description 80
- 238000007599 discharging Methods 0.000 title description 4
- 238000004458 analytical method Methods 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims description 120
- 230000005611 electricity Effects 0.000 claims description 33
- 230000006978 adaptation Effects 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 25
- 230000009466 transformation Effects 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 19
- 230000004044 response Effects 0.000 claims description 13
- 230000003044 adaptive effect Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims 1
- 238000007726 management method Methods 0.000 abstract description 12
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charge and discharge safety management system of an energy storage battery pack for wind and light power generation, which belongs to the field of wind and light power generation and is used for solving the problem that a charge and discharge safety management method of the energy storage battery pack for wind and light power generation is limited to analysis of battery conditions.
Description
Technical Field
The invention belongs to the field of wind and light power generation, relates to a charge and discharge safety management technology of an energy storage battery, and particularly relates to a charge and discharge safety management system of an energy storage battery pack for wind and light power generation.
Background
A plurality of energy storage battery packs are used in the wind-solar power generation process, the current energy storage current transformer is communicated with the battery management system through a plurality of communication modes, so that state information of the battery packs is obtained, when the highest value of the battery packs reaches a limit value, the energy storage current transformer automatically adjusts the voltage of the battery packs to enable the voltage of the battery packs not to exceed the limit value, and protective charging and discharging of the batteries are realized;
therefore, we propose a charge and discharge safety management system of an energy storage battery pack for wind-solar power generation.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a charge and discharge safety management system of an energy storage battery pack for wind-solar power generation.
The technical problems to be solved by the invention are as follows:
how to realize the safety management of the energy storage battery pack for wind-solar power generation based on the analysis result of the electricity storage performance and the analysis result of the charge-discharge connection adaptation.
The aim of the invention can be achieved by the following technical scheme:
the energy storage battery pack charging and discharging safety management system for wind and light power generation comprises an energy storage battery pack, a data acquisition module, an energy storage analysis module, an electric energy conversion module, an adaptation analysis module, a group division module, charging equipment and a controller;
the data acquisition module is used for acquiring battery power flow data of each group of energy storage batteries in the energy storage battery pack for wind-light power generation and sending the battery power flow data of the energy storage batteries for wind-light power generation to the controller, and the controller sends the battery power flow data of the energy storage batteries to the energy storage analysis module:
the energy storage analysis module is used for analyzing the electric energy storage performance of each group of energy storage batteries for wind-light generation, obtaining the current electric energy storage capacity of the energy storage batteries for wind-light generation and sending the current electric energy storage capacity of the energy storage batteries for wind-light generation to the controller, and the controller sends the current electric energy storage capacity of the energy storage batteries for wind-light generation to the group division module;
the electric energy conversion module is used for changing an electric energy transmission mode of transmitting electric energy to the charging equipment by the energy storage battery pack for wind-solar power generation; the data acquisition module is also used for acquiring the power-changing flow data of the electric energy conversion module and sending the power-changing flow data to the controller, and the controller sends the power-changing flow data of the electric energy conversion module to the adaptation analysis module;
the adaptive analysis module is used for analyzing the adaptive situation of the energy storage battery for wind-solar power generation and the electric energy conversion module, so that the electric energy conversion module is connected with the alternating current adaptive index of the energy storage battery through a movable throwing point and sends the alternating current adaptive index to the controller, and the controller sends the alternating current adaptive index to the group division module;
the group dividing module is used for dividing the energy storage battery groups again according to the comprehensive performance of the energy storage batteries, obtaining the battery performance indexes of the energy storage batteries and sending the battery groups to the controller, and the controller divides the energy storage battery groups again according to the battery groups of the energy storage batteries and sorts the energy storage batteries from large to small according to the battery performance indexes of the energy storage batteries.
Further, the battery tide data of the energy storage battery are the voltage amplitude of the battery input end, the current amplitude of the battery input end, the voltage amplitude of the battery output end and the current amplitude of the battery output end of the energy storage battery for wind-solar power generation;
the power transformation trend data comprise a movable throwing point end voltage amplitude, a movable throwing point end current amplitude, a conversion output end voltage amplitude, a conversion output end current amplitude, a power transformation response time length, a movable throwing point end voltage and current phase difference and an output end voltage and current phase difference of the electric energy conversion module.
Further, the analysis process of the energy storage analysis module is specifically as follows:
acquiring battery tide data of an energy storage battery for wind-solar power generation, and acquiring a battery input end voltage amplitude, a battery input end current amplitude, a battery output end voltage amplitude and a battery output end current amplitude of the energy storage battery;
subtracting the voltage amplitude of the battery output end from the voltage amplitude of the battery input end to obtain the in-out voltage difference of the energy storage battery for wind-light power generation, and similarly, subtracting the current amplitude of the battery output end from the current amplitude of the battery input end to obtain the in-out current difference of the energy storage battery for wind-light power generation;
calculating an energy storage loss coefficient of an energy storage battery for wind-solar power generation;
acquiring a preset electricity storage amount of an energy storage battery for wind-light power generation, and calculating a calculated electricity storage amount of the energy storage battery for wind-light power generation;
meanwhile, acquiring the actual electricity storage quantity of an energy storage battery for wind-solar power generation;
calculating the difference value between the actual electricity storage quantity and the calculated electricity storage quantity, and taking the absolute value to obtain the electricity storage quantity difference value of the energy storage battery for wind-light power generation;
if the difference value of the electricity storage quantity is within the preset error range, the calculated electricity storage quantity is calibrated to be the current electricity storage quantity of the energy storage battery for wind-light power generation, and if the difference value of the electricity storage quantity is not within the preset error range, no operation is performed.
Further, the working process of the electric energy conversion module is specifically as follows:
the method comprises the steps that an electric energy conversion module is arranged between an energy storage battery pack and charging equipment, and the electric energy conversion module comprises an alternating current conversion unit and a direct current conversion unit;
switching alternating current power supply and direct current power supply according to the actual charging requirement of the charging equipment, wherein the alternating current conversion unit and the direct current conversion unit are switched through a single-pole double-throw switch;
the electric energy conversion module is connected with the gradient battery circuit through a single-pole N-throw switch, N movable throwing point ends of the single-pole N-throw switch are connected with the energy storage battery circuit in the energy storage battery pack, and a static throwing point of the single-pole N-throw switch is connected with the charging equipment circuit.
Further, the analysis process of the adaptive analysis module is specifically as follows:
obtaining a current transformation flow number of the electric energy conversion module, and obtaining a voltage amplitude of a movable throwing point end, a current amplitude of the movable throwing point end, a voltage amplitude of an output end, a current amplitude of the output end, a transformation response time length, a phase difference between the voltage and the current of the movable throwing point end and a phase difference between the voltage and the current of the output end of the electric energy conversion module;
calculating the cosine value of the phase difference between the voltage and the current of the movable throwing point end, multiplying the cosine value by the voltage amplitude and the current amplitude of the movable throwing point end to obtain the power of the movable throwing point end of the electric energy conversion module, obtaining the output end power of the electric energy conversion module in the same way, and then calculating the ratio of the power of the movable throwing point end of the electric energy conversion module to the power of the output end to obtain the electric energy conversion efficiency of the electric energy conversion module at the movable throwing point;
and calculating an alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point by combining the transformation response time length and the electric energy conversion efficiency.
Further, the dividing process of the group dividing module is specifically as follows:
acquiring an alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through a movable throwing point and the current electric energy storage capacity of the energy storage battery;
multiplying the current power storage quantity by an alternating current adaptation index to obtain a battery performance index of the energy storage battery;
comparing the battery performance index of the energy storage battery with a battery performance index threshold;
if the value of the battery performance index is smaller than or equal to the first battery performance index threshold value, the batteries of the energy storage batteries are grouped into three-level energy storage battery packs;
if the numerical value of the battery performance index is larger than the first battery performance index threshold value and smaller than or equal to the second battery performance index threshold value, the batteries of the energy storage batteries are grouped into a secondary energy storage battery pack;
and if the numerical value of the battery performance index is larger than the second battery performance index threshold value, grouping the batteries of the energy storage batteries into a primary energy storage battery pack.
Further, the first battery performance index threshold is less than the second battery performance index threshold;
the grade of the three-stage energy storage battery pack is lower than that of the two-stage energy storage battery pack, and the grade of the two-stage energy storage battery pack is lower than that of the one-stage energy storage battery pack.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the energy storage performance of each group of energy storage batteries for wind and light power generation is analyzed by the energy storage analysis module, the current electric storage capacity of the energy storage batteries for wind and light power generation is obtained and sent to the group division module, meanwhile, the electric energy transmission mode of the energy storage batteries for wind and light power generation for transmitting electric energy to the charging equipment is changed by the electric energy conversion module, the adaptation condition of the energy storage batteries for wind and light power generation and the electric energy conversion module is analyzed by the adaptation analysis module, the alternating current adaptation index of the energy storage batteries for wind and light power generation is obtained and connected by the electric energy conversion module through the movable throwing point and sent to the group division module, and finally the energy storage batteries are divided into the corresponding energy storage batteries according to the comprehensive performance by the group division module.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is an overall system block diagram of the present invention;
FIG. 2 is a schematic diagram illustrating connection of the power conversion module according to the present invention;
FIG. 3 is a graph showing the voltage and current variation in the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-3, a charge and discharge safety management system of an energy storage battery pack for wind-solar power generation is provided, which comprises an energy storage battery pack, a data acquisition module, an energy storage analysis module, an electric energy conversion module, an adaptation analysis module, a group division module, a charging device and a controller;
in this embodiment, the energy storage battery pack has a plurality of groups, and in this embodiment, preferably, the lithium iron phosphate battery pack is an energy storage battery pack, an input end of the energy storage battery pack is in circuit connection with an output end of the wind-solar power generation device, and an output end of the energy storage battery pack is in circuit connection with an input end of the charging device;
the data acquisition module is used for acquiring battery tide data of each group of energy storage batteries in the wind-solar power generation energy storage battery pack, and the energy storage batteries in a charging completion state are preferably acquired according to the embodiment, and the acquisition process is specifically as follows:
the battery tide data of the energy storage battery are the voltage amplitude of the battery input end, the current amplitude of the battery input end, the voltage amplitude of the battery output end and the current amplitude of the battery output end of the energy storage battery for wind-solar power generation;
the data acquisition module is used for transmitting battery power flow data of the energy storage battery for wind-solar power generation to the controller, and the controller is used for transmitting the battery power flow data of the energy storage battery to the energy storage analysis module;
the energy storage analysis module is used for analyzing the electric energy storage performance of each group of energy storage batteries for wind-solar power generation, and the analysis process is specifically as follows:
the energy storage battery for wind and light power generation is marked as i, i is the number of the energy storage battery, i=1, 2, … …, z is a positive integer;
acquiring battery tide data of an energy storage battery for wind-solar power generation, and acquiring a battery input end voltage amplitude, a battery input end current amplitude, a battery output end voltage amplitude and a battery output end current amplitude of the energy storage battery;
the voltage amplitude of the input end of the battery is subtracted from the voltage amplitude of the output end of the battery to obtain an in-out voltage difference EUi of the energy storage battery for wind-light power generation, and the current amplitude of the input end of the battery is subtracted from the current amplitude of the output end of the battery to obtain an in-out current difference EIi of the energy storage battery for wind-light power generation;
calculating according to a formula CSI= (EUi ×s1+ EIi ×s2)/(s1+s2) to obtain an energy storage loss coefficient CSI of the energy storage battery for wind-solar power generation; wherein s1 and s2 are proportionality coefficients with fixed values, and the values of s1 and s2 are both larger than 0, when in implementation, as long as the specific value of the proportionality coefficient does not affect the positive-negative ratio relation between the parameter and the result value, for example, the value of s1 can be 0.23, the value of s2 can be 0.35, meanwhile, the value of s1 can also be 0.11, and the value of s2 can also be 0.45;
the method comprises the steps of acquiring preset electricity storage capacity YDi of an energy storage battery for wind and light power generation, wherein the preset electricity storage capacity can be acquired by specific parameters marked on the energy storage battery, and the electricity storage capacity of the energy storage battery in an ideal state can be acquired through model comparison;
the calculated electricity storage capacity JSi of the energy storage battery for wind and light power generation is calculated through a formula JSi = YDi × (1-CSi);
meanwhile, an SOC value can be estimated through a linear Kalman filter and a Kalman filtering method to serve as the actual electricity storage quantity of the energy storage battery for wind-solar power generation, wherein when the SOC value is=1, the battery is in a full charge state, and when the SOC value is=0, the energy storage battery is in a full discharge state, and EDi E [0,1];
calculating the difference between the actual electricity storage quantity and the calculated electricity storage quantity, taking an absolute value to obtain the electricity storage quantity difference of the energy storage battery for wind-light power generation, calibrating the calculated electricity storage quantity as the current electricity storage quantity of the energy storage battery for wind-light power generation if the electricity storage quantity difference is within a preset error range, and performing no operation if the electricity storage quantity difference is not within the preset error range;
it should be specifically explained that, although the actual electric energy storage capacity of the energy storage battery can be obtained by combining the linear kalman filter with the kalman filtering method, the measured actual electric energy storage capacity is not necessarily the accuracy of the electric energy storage capacity of the energy storage battery due to the influence of various factors, such as the influence of environmental factors, and therefore the electric energy storage performance of the energy storage battery needs to be analyzed by the energy storage analysis module;
the energy storage analysis module is used for sending the current electric energy storage capacity of the energy storage battery for wind and light power generation to the controller, and the controller is used for sending the current electric energy storage capacity of the energy storage battery for wind and light power generation to the group division module;
the electric energy conversion module is used for changing an electric energy transmission mode of transmitting electric energy to the charging equipment by the energy storage battery pack for wind-solar power generation, and the working process of the module is specifically as follows:
as shown in fig. 2, the electric energy conversion module is disposed between the energy storage battery pack and the charging device, and the electric energy conversion module includes an ac conversion unit and a dc conversion unit, which are switched according to actual charging requirements of the charging device, where the ac conversion unit and the dc conversion unit are switched by a single-pole double-throw switch, and in this embodiment, the ac conversion unit of the electric energy conversion module is preferred;
the electric energy conversion module is connected with the gradient battery circuit through a single-pole N-throw switch, N movable throwing point ends of the single-pole N-throw switch are connected with the energy storage battery circuit in the energy storage battery pack, and a static throwing point of the single-pole N-throw switch is connected with the charging equipment circuit;
the data acquisition module is also used for acquiring power flow data of the power transformation of the power conversion module, and the acquisition process is specifically as follows:
the power transformation trend data comprises a movable throwing point end voltage amplitude, a movable throwing point end current amplitude, a conversion output end voltage amplitude, a conversion output end current amplitude, a power transformation response time length, a movable throwing point end voltage and current phase difference and an output end voltage and current phase difference of the electric energy conversion module;
in the actual working process, acquiring the voltage amplitude of the movable throwing point end, the current amplitude of the movable throwing point end, the voltage amplitude of the conversion output end and the current amplitude of the conversion output end through a voltmeter and an ammeter; acquiring the time for the current to be transmitted from the movable throwing point end to the output end after the single-pole N-throw switch is closed through a timer to obtain the transformation response time;
as shown in fig. 3, the numerical changes of the voltmeter and the ammeter are read to draw a change curve of voltage and current, and the phase difference between the voltage and the current at the movable throwing point of the electric energy conversion module and the phase difference between the voltage and the current at the output end are calculated according to a phase difference formula delta phi= |phi U-phi I|= | (ωt+phi) - (ωt+phi I); wherein ωt is the period of the voltage and current;
the data acquisition module sends the power conversion flow data of the electric energy conversion module to the controller, and the controller sends the power conversion flow data of the electric energy conversion module to the adaptation analysis module;
the adaptation analysis module is used for analyzing the adaptation condition of the energy storage battery for wind-solar power generation and the electric energy conversion module, and the analysis process is specifically as follows:
reading the current transformation flow number of the electric energy conversion module to obtain a movable throwing point end voltage amplitude, a movable throwing point end current amplitude, an output end voltage amplitude, an output end current amplitude, a transformation response time length XTu, a movable throwing point end voltage and current phase difference and an output end voltage and current phase difference of the electric energy conversion module, wherein u is a movable throwing point number, u=1, 2, … …, t and t are positive integers, and the movable throwing point numbers are in one-to-one correspondence with the energy storage battery numbers, so t=z;
the cosine value of the phase difference between the voltage and the current of the movable throwing point end is calculated, and the cosine value is multiplied by the voltage amplitude of the movable throwing point end and the current amplitude of the movable throwing point end to obtain the power of the movable throwing point end of the electric energy conversion module, specifically comprising the following steps:
the power of the movable throwing point end = cosine value of the phase difference between the voltage and the current of the movable throwing point end x the voltage amplitude of the movable throwing point end x the current amplitude of the movable throwing point end;
similarly, calculating to obtain the output end power of the electric energy conversion module, and then calculating the ratio of the power of the movable throwing point end of the electric energy conversion module to the power of the output end to obtain the electric energy conversion efficiency EZu of the electric energy conversion module at the movable throwing point;
according to a formula ETi =r1× EZu/Ezmax+r2/(XTu-XTmin), calculating to obtain an alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point; wherein r1 and r2 are weight coefficients with fixed values, and the values of r1 and r2 are both larger than 0, wherein EZmax is the maximum electric energy conversion efficiency of the electric energy conversion module at the movable throwing point in an ideal state, and XTmin is the shortest transformation response time of the electric energy conversion module in the ideal state, so that in practice, the electric energy conversion efficiency is almost impossible to be larger than the maximum electric energy conversion efficiency, the electric energy conversion efficiency is only infinitely close to the maximum electric energy conversion efficiency, and the transformation response time is also the same;
the adaptation analysis module is used for transmitting the alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point to the controller, and the controller is used for transmitting the alternating current adaptation index to the group division module;
the group dividing module is used for dividing the energy storage battery group again according to the comprehensive performance of the energy storage battery, and the dividing process is specifically as follows:
acquiring the alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point and the current electric energy storage capacity of the energy storage battery;
multiplying the current power storage quantity by an alternating current adaptation index to obtain a battery performance index of the energy storage battery;
comparing the battery performance index of the energy storage battery with a battery performance index threshold;
if the value of the battery performance index is smaller than or equal to the first battery performance index threshold value, the batteries of the energy storage batteries are grouped into three-level energy storage battery packs;
if the numerical value of the battery performance index is larger than the first battery performance index threshold value and smaller than or equal to the second battery performance index threshold value, the batteries of the energy storage batteries are grouped into a secondary energy storage battery pack;
if the numerical value of the battery performance index is larger than the second battery performance index threshold value, the batteries of the energy storage batteries are grouped into a primary energy storage battery pack;
further, the first battery performance index threshold is less than the second battery performance index threshold, the level of the third energy storage battery pack is lower than the level of the second energy storage battery pack, and the level of the second energy storage battery pack is lower than the level of the first energy storage battery pack;
the group dividing module sends the battery performance index and the battery group of the energy storage batteries to the controller, and the controller divides the energy storage battery groups again according to the battery group of the energy storage batteries and sorts the energy storage batteries from large to small according to the battery performance index of the energy storage batteries;
in the present application, if a corresponding calculation formula appears, the above calculation formulas are all dimensionality-removed and numerical calculation, and the size of the weight coefficient, the scale coefficient and other coefficients existing in the formulas is a result value obtained by quantizing each parameter, so long as the proportional relation between the parameter and the result value is not affected.
Example two
Based on the same conception, the invention provides a charge and discharge safety management method of an energy storage battery pack for wind-solar power generation, which comprises the following steps:
step S100, a data acquisition module acquires battery tide data of each group of energy storage batteries in an energy storage battery pack for wind-light power generation, and sends the battery tide data of the energy storage batteries for wind-light power generation to a controller, and the controller sends the battery tide data of the energy storage batteries to an energy storage analysis module;
step S200, an energy storage analysis module analyzes the electric energy storage performance of each group of energy storage batteries for wind-light power generation, the current electric energy storage capacity of the energy storage batteries for wind-light power generation is obtained and sent to a controller, and the controller sends the current electric energy storage capacity of the energy storage batteries for wind-light power generation to a group division module;
in the step S200, the analysis process of the energy storage analysis module specifically includes:
obtaining battery tide data of an energy storage battery for wind and light power generation, obtaining a battery input end voltage amplitude value, a battery input end current amplitude value, a battery output end voltage amplitude value and a battery output end current amplitude value of the energy storage battery, and subtracting the battery output end voltage amplitude value from the battery input end voltage amplitude value to obtain an in-out voltage difference of the energy storage battery for wind and light power generation;
step S300, an electric energy conversion module changes an electric energy transmission mode of an energy storage battery pack for wind and light power generation for transmitting electric energy to charging equipment, the electric energy conversion module is arranged between the energy storage battery pack and the charging equipment, alternating current power supply and direct current power supply are switched according to actual charging requirements of the charging equipment, an alternating current conversion unit and a direct current conversion unit are switched through a single-pole double-throw switch, the electric energy conversion module is connected with a gradient battery circuit through a single-pole N-throw switch, N movable throw ends of the single-pole N-throw switch are connected with an energy storage battery circuit in the energy storage battery pack, and a static throw of the single-pole N-throw switch is connected with the charging equipment circuit;
step S400, the data acquisition module also acquires the power conversion flow data of the electric energy conversion module, the power conversion flow data of the electric energy conversion module is sent to the controller, and the controller sends the power conversion flow data of the electric energy conversion module to the adaptation analysis module;
step S500, an adaptation analysis module analyzes the adaptation condition of an energy storage battery for wind-solar power generation and an electric energy conversion module, reads the current variation flow number of the electric energy conversion module, obtains the voltage amplitude of a movable throwing point end, the current amplitude of the movable throwing point end, the voltage amplitude of an output end, the current amplitude of the output end, the power transformation response time XTu, the phase difference between the voltage of the movable throwing point end and the current and the phase difference between the voltage of the output end and the current, calculates the cosine value of the phase difference between the voltage of the movable throwing point end and the current, multiplies the voltage amplitude of the movable throwing point end and the current amplitude of the movable throwing point end to obtain the power of the movable throwing point end of the electric energy conversion module, calculates the power conversion efficiency of the electric energy conversion module at the movable throwing point, calculates the AC adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point by a formula, and the controller sends the AC adaptation index to a group division module;
in the step S500, the analysis process of the adaptation analysis module specifically includes:
obtaining a variable current flow number of the electric energy conversion module, obtaining a movable throwing point end voltage amplitude, a movable throwing point end current amplitude, an output end voltage amplitude, an output end current amplitude, a transformation response time XTu, a movable throwing point end voltage and current phase difference and an output end voltage and current phase difference of the electric energy conversion module, calculating a cosine value of the movable throwing point end voltage and the current phase difference, multiplying the cosine value with the movable throwing point end voltage amplitude and the movable throwing point end current amplitude to obtain a movable throwing point end power of the electric energy conversion module, and similarly, calculating an output end power of the electric energy conversion module, and then calculating a ratio of the movable throwing point end power to the output end power of the electric energy conversion module to obtain electric energy conversion efficiency of the electric energy conversion module at the movable throwing point;
step S600, the group dividing module divides the energy storage battery packs again according to the comprehensive performance of the energy storage batteries, the battery performance indexes of the energy storage batteries and the battery groups are obtained and sent to the controller, and the controller divides the energy storage battery packs again according to the battery groups of the energy storage batteries and sorts the energy storage batteries from large to small according to the battery performance indexes of the energy storage batteries;
in the step S600, the dividing process of the group dividing module specifically includes:
the method comprises the steps of obtaining an alternating current adaptive index of an energy storage battery connected through a movable throwing point and the current electric energy storage capacity of the energy storage battery, multiplying the current electric energy storage capacity by the alternating current adaptive index to obtain a battery performance index of the energy storage battery, comparing the battery performance index of the energy storage battery with a battery performance index threshold, grouping the batteries of the energy storage battery into a three-stage energy storage battery pack if the value of the battery performance index is smaller than or equal to a first battery performance index threshold, grouping the batteries of the energy storage battery into a two-stage energy storage battery pack if the value of the battery performance index is larger than the first battery performance index threshold and smaller than or equal to a second battery performance index threshold, and grouping the batteries of the energy storage battery into a one-stage energy storage battery pack if the value of the battery performance index is larger than the second battery performance index threshold.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (4)
1. The utility model provides a wind-solar power generation is with energy storage battery pack charge-discharge safety management system which characterized in that includes:
the data acquisition module is used for acquiring battery power flow data of each group of energy storage batteries in the energy storage battery pack for wind-solar power generation and sending the battery power flow data to the energy storage analysis module through the controller:
the battery tide data of the energy storage battery are a battery input end voltage amplitude, a battery input end current amplitude, a battery output end voltage amplitude and a battery output end current amplitude of the energy storage battery for wind-solar power generation;
the energy storage analysis module is used for analyzing the electric energy storage performance of each group of energy storage batteries for wind-light power generation, so that the current electric energy storage capacity of the energy storage batteries for wind-light power generation is obtained and is sent to the group division module through the controller;
the analysis process of the energy storage analysis module specifically comprises the following steps:
acquiring battery tide data of an energy storage battery for wind-solar power generation, and acquiring a battery input end voltage amplitude, a battery input end current amplitude, a battery output end voltage amplitude and a battery output end current amplitude of the energy storage battery;
subtracting the voltage amplitude of the battery output end from the voltage amplitude of the battery input end to obtain the in-out voltage difference of the energy storage battery for wind-light power generation, and similarly, subtracting the current amplitude of the battery output end from the current amplitude of the battery input end to obtain the in-out current difference of the energy storage battery for wind-light power generation;
calculating an energy storage loss coefficient of an energy storage battery for wind-solar power generation;
acquiring a preset electricity storage amount of an energy storage battery for wind-light power generation, and calculating a calculated electricity storage amount of the energy storage battery for wind-light power generation;
meanwhile, acquiring the actual electricity storage quantity of an energy storage battery for wind-solar power generation;
calculating the difference value between the actual electricity storage quantity and the calculated electricity storage quantity, and taking the absolute value to obtain the electricity storage quantity difference value of the energy storage battery for wind-light power generation;
if the difference value of the electricity storage quantity is within the preset error range, calibrating the calculated electricity storage quantity as the current electricity storage quantity of the energy storage battery for wind-solar power generation, and if the difference value of the electricity storage quantity is not within the preset error range, not performing any operation;
the electric energy conversion module is used for changing an electric energy transmission mode of transmitting electric energy to the charging equipment by the energy storage battery pack for wind-solar power generation;
the data acquisition module is also used for acquiring the power-transformation flow data of the electric energy conversion module and sending the power-transformation flow data to the adaptation analysis module through the controller;
the power flow data of the power transformation comprise a voltage amplitude of a movable throwing point end, a current amplitude of the movable throwing point end, a voltage amplitude of a conversion output end, a current amplitude of the conversion output end, a power transformation response time, a phase difference between the voltage of the movable throwing point end and the current and a phase difference between the voltage of the output end and the current of the electric energy conversion module;
the adaptive analysis module is used for analyzing the adaptive situation of the energy storage battery for wind-solar power generation and the electric energy conversion module, so that the alternating current adaptive index of the electric energy conversion module, which is connected with the energy storage battery through a movable throwing point, is sent to the group division module through the controller;
the analysis process of the adaptation analysis module is specifically as follows:
obtaining a current transformation flow number of the electric energy conversion module, and obtaining a voltage amplitude of a movable throwing point end, a current amplitude of the movable throwing point end, a voltage amplitude of an output end, a current amplitude of the output end, a transformation response time length, a phase difference between the voltage and the current of the movable throwing point end and a phase difference between the voltage and the current of the output end of the electric energy conversion module;
calculating the cosine value of the phase difference between the voltage and the current of the movable throwing point end, multiplying the cosine value by the voltage amplitude and the current amplitude of the movable throwing point end to obtain the power of the movable throwing point end of the electric energy conversion module, obtaining the output end power of the electric energy conversion module in the same way, and then calculating the ratio of the power of the movable throwing point end of the electric energy conversion module to the power of the output end to obtain the electric energy conversion efficiency of the electric energy conversion module at the movable throwing point;
calculating an alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through the movable throwing point by combining the transformation response time length and the electric energy conversion efficiency;
the group dividing module is used for dividing the energy storage battery group again according to the comprehensive performance of the energy storage battery, obtaining the battery performance index of the energy storage battery and sending the battery group to the controller;
and the controller is used for re-dividing the energy storage battery groups according to the battery groups of the energy storage batteries and sequencing the energy storage batteries from large to small according to the battery performance indexes of the energy storage batteries.
2. The charge and discharge safety management system of an energy storage battery pack for wind-solar power generation according to claim 1, wherein the working process of the electric energy conversion module is specifically as follows:
the method comprises the steps that an electric energy conversion module is arranged between an energy storage battery pack and charging equipment, and the electric energy conversion module comprises an alternating current conversion unit and a direct current conversion unit;
switching alternating current power supply and direct current power supply according to the actual charging requirement of the charging equipment, wherein the alternating current conversion unit and the direct current conversion unit are switched through a single-pole double-throw switch;
the electric energy conversion module is connected with the gradient battery circuit through a single-pole N-throw switch, N movable throwing point ends of the single-pole N-throw switch are connected with the energy storage battery circuit in the energy storage battery pack, and a static throwing point of the single-pole N-throw switch is connected with the charging equipment circuit.
3. The charge and discharge safety management system of an energy storage battery pack for wind-solar power generation according to claim 1, wherein the dividing process of the group dividing module is specifically as follows:
acquiring an alternating current adaptation index of the electric energy conversion module connected with the energy storage battery through a movable throwing point and the current electric energy storage capacity of the energy storage battery;
multiplying the current power storage quantity by an alternating current adaptation index to obtain a battery performance index of the energy storage battery;
comparing the battery performance index of the energy storage battery with a battery performance index threshold;
if the value of the battery performance index is smaller than or equal to the first battery performance index threshold value, the batteries of the energy storage batteries are grouped into three-level energy storage battery packs;
if the numerical value of the battery performance index is larger than the first battery performance index threshold value and smaller than or equal to the second battery performance index threshold value, the batteries of the energy storage batteries are grouped into a secondary energy storage battery pack;
and if the numerical value of the battery performance index is larger than the second battery performance index threshold value, grouping the batteries of the energy storage batteries into a primary energy storage battery pack.
4. A system for safety management of charge and discharge of an energy storage battery for wind and solar power generation according to claim 3, wherein the first battery performance index threshold is less than the second battery performance index threshold;
the grade of the three-stage energy storage battery pack is lower than that of the two-stage energy storage battery pack, and the grade of the two-stage energy storage battery pack is lower than that of the one-stage energy storage battery pack.
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