CN112098856A - Dynamic measurement method for endurance time of storage battery pack of transformer substation - Google Patents
Dynamic measurement method for endurance time of storage battery pack of transformer substation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a dynamic measurement method for endurance time of a storage battery pack of a transformer substation, which comprises the steps of carrying out data fitting by utilizing characteristic parameters and influence factors of the storage battery pack of the transformer substation to construct an endurance time model; calculating the actual capacity dynamic parameter of the storage battery pack based on the endurance time model, and simulating the actual capacity dynamic parameter; establishing a storage battery pack initial actual capacity dynamic measurement model by combining the simulation result; and analyzing and refining the historical operation sample data, and constructing an actual capacity dynamic measurement model by combining operation correction theoretical calculation parameters of the preliminary actual capacity dynamic measurement model, so as to dynamically measure the actual capacity of the storage battery. According to the invention, the accurate time that the storage battery pack of the transformer substation can be loaded and the actual capacity of the storage battery are provided through the construction model, so that the phenomenon that the load time of the storage battery is incorrectly evaluated by a transformer operator to cause serious economic loss is avoided.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation.
Background
The direct-current storage battery is an important component of a direct-current power supply system in a power supply system, provides safe, stable and reliable power guarantee for loads in the power system, and meanwhile protects normal operation of power equipment such as relay protection and communication equipment, and people pay great attention to development, operation and maintenance of the storage battery as backup power of the power system. The direct current system is an independent power supply, is not influenced by a generator, auxiliary power and a system running mode, and ensures that a backup power supply-storage battery continuously provides important equipment of the direct current power supply under the condition that external alternating current is interrupted.
When the alternating current of the direct current system is lost, the storage battery continuously provides a direct current power supply, and the actual capacity and the endurance time of the storage battery always trouble dispatching and power transformation operators. The dispatching personnel need to know the time of the load of the storage battery at the moment so as to judge whether a handling measure for emergently transferring the load needs to be taken, so that the situation that the total station becomes a dead switch after the storage battery loses effect, a circuit cannot trip when the circuit breaks down, and override trip can be caused is avoided. After the alternating current voltage of a direct current system of a transformer substation of 220kV or more is lost, the problem is particularly obvious in consideration of safe and stable operation of the system, and if accurate data does not exist, a dispatcher is passive when handling accidents.
For power transformation operators, the judgment of the endurance time of the storage battery of the transformer substation from the capacity and the discharge current of the storage battery is not accurate, the whole storage battery has an aging phenomenon, and the individual storage battery is difficult to find under the condition of floating charging when having open-circuit hidden danger, so that the judgment of the operational time of the storage battery by field operation and maintenance personnel has difficulty.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a dynamic measurement method for the endurance time of the storage battery pack of the transformer substation, which can construct a model according to parameters such as the real-time operation condition, voltage, current and the like of the storage battery, thereby accurately calculating the capacity of the storage battery pack and the time capable of carrying load.
In order to solve the technical problems, the invention provides the following technical scheme: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
performing data fitting by using the characteristic parameters and the influence factors of the storage battery pack of the transformer substation, and constructing a endurance time model; calculating the actual capacity dynamic parameter of the storage battery pack based on the endurance time model, and simulating the actual capacity dynamic parameter; establishing a storage battery pack initial actual capacity dynamic measurement model by combining the simulation result; and analyzing and refining the historical operation sample data, and constructing an actual capacity dynamic measurement model by combining operation correction theoretical calculation parameters of the preliminary actual capacity dynamic measurement model, so as to dynamically measure the actual capacity of the storage battery.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the characteristic parameters include a discharge current of the storage battery: the discharge current is the current formed when the storage battery discharges the stored electric energy to the load, and the calculation formula is as follows:
wherein, IdThe discharge current is P, the rated power is P, the load power factor is F, the utilization coefficient of the load is k, and the instantaneous voltage of the storage battery is U; rated capacity of battery: the rated capacity is the conventional value of the apparent power of the main connection, namely the apparent power of the transformer, the active power of the motor, and the apparent power or the reactive power of the phase modulation equipment.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the influencing factors include the temperature of the storage battery: when the temperature rises, the movement speed of the electrolyte is increased, so that the capacity of the storage battery is increased; the viscosity of the electrolyte increases when the temperature decreases, resulting in a decrease in the capacity of the battery; the relationship between the battery temperature and the battery capacity is as follows:
wherein, T1,T2Is the temperature of the electrolyte, beta is the temperature coefficient of the battery, CT1At a temperature of T1Capacity in degrees Celsius, CT2At a temperature of T2Capacity in degrees celsius; degree of aging of the battery: the internal resistance of the storage battery can increase along with the gradual aging of the polar plate, and the internal resistance is the aging degree of the storage battery.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the internal resistance of the storage battery comprises the following ohmic internal resistance: the resistance of the electrode, the diaphragm, the electrolyte, the connecting bar and the pole in the battery is included, the ohmic internal resistance is related to the size and the structure of the battery and follows the ohm law; polarization internal resistance: the resistance caused by the transfer of electrode charges and diffusion polarization is dependent on the working conditions of the battery and the electrode structure and does not follow ohm's law.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the endurance model comprises a time of flight model including,
wherein, tdAlpha is the discharge time of the storage battery, T is the temperature of the storage battery, H is the rated capacity of the storage battery, and O is the aging degree of the storage battery.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the actual capacity dynamic parameters comprise that the internal resistance of the storage battery, namely the aging degree of the storage battery, is obtained by calculation through applying a constant current source at two ends of the storage battery and detecting the voltage and the included angle of the end of the storage battery, and the calculation formula is as follows:
where θ is the angle between the voltage and current at the battery terminal, IrIs a charging current; when the storage battery passes through constant current, the circuit immediately generates ohmic internal resistance voltage drop, and the formula is as follows:
wherein R is a molar gas constant, K is an absolute temperature, N is an electron gain and loss number in an electrochemical reaction, N is an electrode reaction diffusion coefficient, trFor the charging time, F is the Faraday constant, CdThe electric double layer capacitance between the positive electrode and the negative electrode of the battery.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: and the simulation comprises the steps of utilizing the discharge current and the discharge time of the storage battery and the internal resistance of the storage battery as the input quantity of the simulation, and carrying out curve fitting through Matlab to obtain the residual electric quantity of the storage battery at different moments.
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the preliminary actual capacity dynamic measurement model comprises the following steps of defining an influence coefficient, and constructing the preliminary actual capacity dynamic measurement model:
where q (t) is the actual capacity of the battery at time t, and t is tr+td。
The invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the correction theoretical calculation parameters comprise the aging degree coefficient of the storage battery:
xO＝-1.27tN2+0.79；
rate coefficient of charge and discharge of the storage battery:
xI＝0.0001143×(-5.2667+t)3；
temperature coefficient of battery:
the invention relates to a preferable scheme of a dynamic measurement method for the endurance time of a storage battery pack of a transformer substation, wherein the preferable scheme comprises the following steps: the constructing of the dynamic measurement model of the actual capacity includes, based on the preliminary dynamic measurement model of the actual capacity, correcting theoretical calculation parameters:
and combining the actual capacity dynamic measurement models to complete the construction of the actual capacity dynamic measurement model:
the invention has the beneficial effects that: accurate time that the storage battery pack of the transformer substation can be loaded and the actual capacity of the storage battery are provided through the construction model, and serious economic loss caused by incorrect evaluation of power transformation operation personnel on the loaded time of the storage battery is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be 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 to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic flow chart of a method for dynamically measuring the endurance time of a storage battery pack of a substation according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a battery endurance circuit simulation system of a dynamic measurement method for endurance time of a storage battery pack of a substation according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a fitting result of an actual capacity dynamic parameter of a transformer substation storage battery pack endurance time dynamic measurement method according to a first embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, a first embodiment of the present invention provides a method for dynamically measuring a battery pack endurance time of a substation, including:
s1: and performing data fitting by using the characteristic parameters and the influence factors of the storage battery pack of the transformer substation to construct a endurance time model.
The characteristic parameters comprise discharge current of the storage battery and rated capacity of the storage battery;
discharge current of the battery: the discharge current is the current formed when the storage battery discharges the stored electric energy to the load, and the calculation formula is as follows:
wherein, IdThe discharge current is P, the rated power is P, the load power factor is F, the utilization coefficient of the load is k, and the instantaneous voltage of the storage battery is U;
rated capacity of battery: the rated capacity is the conventional value of the apparent power of the main connection, namely the apparent power of the transformer, the active power of the motor, the apparent power or the reactive power of the phase modulation equipment, and the value is generally marked outside the battery.
The influencing factors comprise the temperature of the storage battery and the aging degree of the storage battery;
temperature of the battery: when the temperature rises, the movement speed of the electrolyte is increased, so that the capacity of the storage battery is increased; the viscosity of the electrolyte increases when the temperature decreases, resulting in a decrease in the capacity of the battery; the relationship between the battery temperature and the battery capacity is as follows:
wherein, T1,T2Is the temperature of the electrolyte and beta is the temperature of the batteryCoefficient, CT1At a temperature of T1Capacity in degrees Celsius, CT2At a temperature of T2Capacity in degrees celsius;
degree of aging of the battery: the internal resistance of the storage battery is higher in correlation with the charge degree, the internal resistance of the storage battery is increased along with the gradual aging of the polar plate, and the difference between the internal resistance of the storage battery and the internal resistance of the storage battery is 2-4 times when the storage battery is fully charged and fully discharged, so that the internal resistance is used as the aging degree of the storage battery, and the reliability is higher.
The internal resistance of the storage battery comprises ohmic internal resistance and polarization internal resistance;
ohmic internal resistance: the resistance of the electrode, the diaphragm, the electrolyte, the connecting bar and the pole in the battery can be changed due to grid corrosion, electrode deformation, electrolyte concentration and temperature in the whole service life of the battery, but can be considered to be unchanged in each internal resistance detection process of the battery, and the size of the ohmic internal resistance is related to the size and the structure of the battery and follows ohm's law;
polarization internal resistance: the resistance caused by the transfer of electrode charges and diffusion polarization is related to the working condition and electrode structure of the storage battery, and only changes when the current density changes due to the change of the electrode structure and state at the later stage of the service life or the later stage of discharge of the storage battery, but the value is still small and does not follow the ohm law.
Constructing a endurance time model:
wherein, tdAlpha is the discharge time of the storage battery, T is the temperature of the storage battery, H is the rated capacity of the storage battery, and O is the aging degree of the storage battery.
It should be noted that the temperature of the storage battery has a great influence on the performance of the storage battery, and in the case of a lead-acid storage battery, particularly, in the charging and discharging process, an "oxygen cycle" exists inside the storage battery, and the generated extra heat can raise the temperature, so that the influence is greater, and therefore, when the performance of the storage battery is judged, the influence of the temperature needs to be fully considered; when the temperature rises, the movement speed of the electrolyte is increased, and the obtained kinetic energy is increased, so that the permeability is enhanced, the resistance of the electrolyte is reduced, the electrochemical reaction is enhanced, and the capacity of the storage battery is increased; when the temperature is reduced, the viscosity of the electrolyte is increased, so that the ion movement is greatly resisted, the diffusion capacity is reduced, the ion movement is difficult to permeate into the polar plate, and the deep part of the active substance is not fully utilized due to the lack of acid, so that the capacity is reduced. Secondly, the resistance of the electrolyte increases with the decrease of the temperature, and as a result, the internal resistance of the battery increases, the voltage drop increases, and the capacity decreases.
S2: and calculating the actual capacity dynamic parameters of the storage battery pack based on the endurance time model, and simulating the actual capacity dynamic parameters.
(1) Firstly, calculating the aging degree of the storage battery;
the internal resistance of the storage battery, namely the aging degree of the storage battery, is obtained by calculating through applying a constant current source at two ends of the storage battery and detecting the voltage and the included angle of the end of the storage battery, and the calculation formula is as follows:
where θ is the angle between the voltage and current at the battery terminal, IrIs a charging current;
when the storage battery passes through constant current, the circuit immediately generates ohmic internal resistance voltage drop, and the formula is as follows:
wherein R is a molar gas constant, K is an absolute temperature, N is an electron gain and loss number in an electrochemical reaction, N is an electrode reaction diffusion coefficient, trFor the charging time, F is the Faraday constant, CdThe electric double layer capacitance between the positive electrode and the negative electrode of the battery.
It should be noted that the molar gas constant is a physical constant in relation to each thermodynamic function in the equation of state of matter, and its value is about 8.314472J/(mol · K); the Faraday constant represents the charge carried by each mole of electrons and has a value of 96485.33289 + -0.00059C/mol; formation of electric double layer capacitance: when the electrode is charged, the surface charge of the electrode in the desired polarized electrode state will attract the opposite ions in the surrounding electrolyte solution, causing these ions to attach to the electrode surface forming a double charge layer.
(2) And performing curve fitting through Matlab by using the discharge current, the discharge time and the discharge voltage of the storage battery and the internal resistance of the storage battery as simulated input quantities to obtain the residual electric quantity of the storage battery at different moments.
S3: and establishing a dynamic measurement model of the initial actual capacity of the storage battery pack by combining the simulation result.
Defining an influence coefficient, and constructing a preliminary actual capacity dynamic measurement model:
where q (t) is the actual capacity of the battery at time t, and t is tr+td。
At this time, the value calculated by the preliminary actual capacity dynamic measurement model is not accurate enough, and three factors need to be considered:
(1) the effect of different temperatures needs to be considered first: the capacity of the battery varies with temperature.
(2) Secondly, the influence of internal resistance needs to be considered, when the storage battery discharges with small current, the real current density of the polar plate is small, the polarization is also small, namely the polarization internal resistance is small. When the storage battery is discharged by the current of the design and research of a large storage battery pack online detection system, or the cathode is passivated when discharging at low temperature, or irreversible sulfation occurs, the polarization resistance has a large value, and the performance of the battery is greatly influenced.
(3) Finally, the influence of different currents needs to be considered: under different charging or discharging current conditions, the effective capacity that the battery pack can be charged or discharged is different, namely the problem of charging and discharging efficiency.
S4: and analyzing and refining the historical operation sample data, and combining the operation correction theoretical calculation parameters of the preliminary actual capacity dynamic measurement model to construct an actual capacity dynamic measurement model and dynamically measure the actual capacity of the storage battery.
The steps for correcting the theoretical calculation parameters are as follows:
(1) the aim of theoretical calculation parameter correction is confirmed: the temperature coefficient of the storage battery, the aging degree coefficient of the storage battery and the charge and discharge rate coefficient of the storage battery;
(2) setting a parameter range, carrying out data fitting for multiple times until the error is less than 2%, and then determining parameter values according to the best fitting result, wherein the result is as follows:
a. temperature coefficient of battery:
the amount of change in the capacity of the battery when the temperature changes by 1 ℃ is referred to as the temperature coefficient of capacity.
b. Aging degree coefficient of the storage battery:
xO＝-1.27tN2+0.79；
c. rate coefficient of charge and discharge of the storage battery:
xI＝0.0001143×(-5.2667+t)3。
(3) obtaining an influence coefficient by calculating the relation between the analysis parameters and time:
and substituting the influence coefficient into the preliminary actual capacity dynamic measurement model to obtain an actual capacity dynamic measurement model, which is as follows:
preferably, the embodiment constructs the endurance model according to the temperature, the rated capacity and the aging degree of the storage battery, so that the discharge time of the storage battery can be obtained; constructing an actual capacity dynamic measurement model through the temperature coefficient, the aging degree coefficient, the charge-discharge multiplying factor coefficient and the charge-discharge time of the storage battery, so that the actual capacity of the storage battery can be obtained; the model is embedded into the meter, field personnel can carry the meter with him to view the actual capacity and the time that can be loaded of the battery, and the meter can be used on any substation storage battery.
Example 2
Referring to fig. 2 to fig. 3, the technical effects adopted in the method are verified and explained, in the embodiment, a comparison test is performed by selecting a conventional detection method, and the test results are compared by a scientific demonstration means to verify the real effect of the method.
The method designed by the present invention was verified according to the following simulation examples.
The conventional detection method is to verify the capacity of the storage battery by performing a whole group of check discharge, i.e. connecting the storage battery pack to a load box and then discharging until the cut-off voltage, but the method has many hidden dangers and disadvantages: the time is long, the risk is large, the battery pack needs to be separated from the system, all chemical energy stored in the battery pack is consumed in a heat energy mode, electric energy is wasted, time and labor are wasted, the efficiency is low, a checking discharge test is performed, certain conditions need to be met, and firstly, the test is performed under the condition that the commercial power is basically guaranteed as far as possible; second, there must be a spare battery pack. Because the internal chemical reaction of the storage battery is not completely reversible, and the frequency of full-depth cyclic discharge is limited, the deep discharge is not suitable for the frequent deep discharge of the lead-acid storage battery.
The method comprises the steps that a storage battery endurance circuit simulation system is built on a Matlab platform, 200Ah lead-acid batteries are selected for the storage batteries, and the current and the voltage of a battery pack are obtained through simulation, wherein the current is used as the input of the model, as shown in figure 2, a discharge switch in the figure is turned on, the constant-current discharge characteristic of the batteries is tested, and the capacity change characteristic of the batteries can be tested by changing the discharge current and the temperature through a parameter scanning method; and the discharge protection voltage is set, so that the discharge depth can be controlled, and the recovery characteristic can be tested to turn on the charge switch. In the simulation of the system, the temperature, the current and the voltage of the storage battery at each moment are shown in a table 1, and the test standard of the internal resistance of the storage battery is shown in a table 2.
Fitting simulation is carried out on the actual capacity dynamic parameters based on a Matlab platform, the fitting result is shown in figure 3, and the most fit part of the Temperature curve and the Charge-discharge ratio curve is selected for analysis and calculation, so that the relationship between the Temperature coefficient of the storage battery, the aging degree coefficient of the storage battery, the Charge-discharge rate coefficient of the storage battery and the capacity of the storage battery is obtained.
Table one: and the temperature, the current and the voltage data table of each time of the storage battery.
It can be seen from table one that the temperature of the storage battery increases with the increase of time, and when a certain time is reached, the temperature decreases and then increases; the voltage across the battery decreases with increasing time; and the current across the battery is proportional to the temperature of the battery.
Table two: and (5) a test standard table of the internal resistance of the storage battery.
| Capacity of | Voltage of | Internal resistance value |
| 100Ah | 12V | 5.50 |
| 120Ah | 12V | 4.30 |
| 150Ah | 12V | 4.00 |
| 200Ah | 12V | 3.00 |
| 230Ah | 12V | 2.00 |
| 250Ah | 12V | 1.00 |
| 300Ah | 2V | 0.65 |
The actual capacity of the battery is measured and calculated by a brand-new 150Ah storage battery respectively by using a traditional method and the method, the test result of the traditional method is 148Ah, the test result of the method is 149.7Ah, and the test result shows that the method can provide more accurate storage battery capacity for power transformation operators, the time measured and calculated by using the traditional method needs 2 minutes, the method only needs 5 seconds, and the measuring and calculating speed is obviously accelerated.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A dynamic measurement method for endurance time of a storage battery pack of a transformer substation is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
performing data fitting by using the characteristic parameters and the influence factors of the storage battery pack of the transformer substation, and constructing a endurance time model;
calculating the actual capacity dynamic parameter of the storage battery pack based on the endurance time model, and simulating the actual capacity dynamic parameter;
establishing a storage battery pack initial actual capacity dynamic measurement model by combining the simulation result;
and analyzing and refining the historical operation sample data, and constructing an actual capacity dynamic measurement model by combining operation correction theoretical calculation parameters of the preliminary actual capacity dynamic measurement model, so as to dynamically measure the actual capacity of the storage battery.
2. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 1, wherein: the characteristic parameters include, for example,
discharge current of the battery: the discharge current is the current formed when the storage battery discharges the stored electric energy to the load, and the calculation formula is as follows:
wherein, IdFor discharge current, P is the rated power, F is the load power factor, and k is the loadUsing the coefficient, U is the instantaneous voltage of the storage battery;
rated capacity of battery: the rated capacity is the conventional value of the apparent power of the main connection, namely the apparent power of the transformer, the active power of the motor, and the apparent power or the reactive power of the phase modulation equipment.
3. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 2, wherein: the influencing factors include the number of factors including,
temperature of the battery: when the temperature rises, the movement speed of the electrolyte is increased, so that the capacity of the storage battery is increased; the viscosity of the electrolyte increases when the temperature decreases, resulting in a decrease in the capacity of the battery; the relationship between the battery temperature and the battery capacity is as follows:
wherein, T1,T2Is the temperature of the electrolyte, beta is the temperature coefficient of the battery, CT1At a temperature of T1Capacity in degrees Celsius, CT2At a temperature of T2Capacity in degrees celsius;
degree of aging of the battery: the internal resistance of the storage battery can increase along with the gradual aging of the polar plate, and the internal resistance is the aging degree of the storage battery.
4. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 3, wherein: the internal resistance of the secondary battery includes,
ohmic internal resistance: the resistance of the electrode, the diaphragm, the electrolyte, the connecting bar and the pole in the battery is included, the ohmic internal resistance is related to the size and the structure of the battery and follows the ohm law;
polarization internal resistance: the resistance caused by the transfer of electrode charges and diffusion polarization is dependent on the working conditions of the battery and the electrode structure and does not follow ohm's law.
5. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 4, wherein: the endurance model comprises a time of flight model including,
wherein, tdAlpha is the discharge time of the storage battery, T is the temperature of the storage battery, H is the rated capacity of the storage battery, and O is the aging degree of the storage battery.
6. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 5, wherein: the actual capacity dynamic parameter may include,
the internal resistance of the storage battery, namely the aging degree of the storage battery, is obtained by calculating through applying a constant current source at two ends of the storage battery and detecting the voltage and the included angle of the end of the storage battery, and the calculation formula is as follows:
where θ is the angle between the voltage and current at the battery terminal, IrIs a charging current;
when the storage battery passes through constant current, the circuit immediately generates ohmic internal resistance voltage drop, and the formula is as follows:
wherein R is a molar gas constant, K is an absolute temperature, N is an electron gain and loss number in an electrochemical reaction, N is an electrode reaction diffusion coefficient, trFor the charging time, F is the Faraday constant, CdThe electric double layer capacitance between the positive electrode and the negative electrode of the battery.
7. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 6, wherein: the simulation includes that,
and performing curve fitting through Matlab by using the discharge current and the discharge time of the storage battery and the internal resistance of the storage battery as the simulated input quantity to obtain the residual electric quantity of the storage battery at different moments.
8. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 7, wherein: the preliminary actual capacity dynamic measurement model includes,
defining an influence coefficient, and constructing a preliminary actual capacity dynamic measurement model:
where q (t) is the actual capacity of the battery at time t, and t is tr+td。
9. The method for dynamically measuring the endurance time of the storage battery pack of the substation according to claim 8, wherein: the correction theoretical calculation parameters include, for example,
aging degree coefficient of the storage battery:
xO＝-1.27tN2+0.79；
rate coefficient of charge and discharge of the storage battery:
xI＝0.0001143×(-5.2667+t)3；
temperature coefficient of battery:
10. the substation storage battery pack endurance time dynamic measurement method of claim 9, wherein: the constructing of the actual capacity dynamic measurement model includes,
correcting theoretical calculation parameters based on the preliminary actual capacity dynamic measurement model:
and combining the actual capacity dynamic measurement models to complete the construction of the actual capacity dynamic measurement model:
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