CN112748346A - Storage battery state of charge calculation method - Google Patents
Storage battery state of charge calculation method Download PDFInfo
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- CN112748346A CN112748346A CN202011436306.3A CN202011436306A CN112748346A CN 112748346 A CN112748346 A CN 112748346A CN 202011436306 A CN202011436306 A CN 202011436306A CN 112748346 A CN112748346 A CN 112748346A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The invention provides a storage battery state of charge calculation method, which comprises the following steps: (1): preservation of Q0T is 0, and flag is 0; (2): adding one to t, and collecting charge and discharge current; (3): judging whether T is larger than T, if yes, entering (4); otherwise, returning to (2); (4): if the flag is 1, disturbing the charge-discharge current, and sampling the terminal voltage; (5): calculating internal resistance; (6): calculating electromotive force; (7): calculating a state of charge estimate; (8): judgment of Q0If the current value is greater than the low battery reference value, entering (15); instead, enter (9); (9): calculating charge and discharge electric quantity; (10): calculating the difference value between the estimated value of the state of charge and the standard value of the state of charge; (11): and judging whether the difference value is larger than the difference value reference value.
Description
Technical Field
The invention belongs to the technical field of storage batteries, and particularly relates to a storage battery charge state calculation method.
Background
With the continuous development of technology and the increasing demand of people for electric energy, various new energy power generation is widely used by people. However, from the perspective of power supply, new energy power generation is easily affected by weather conditions, and has the characteristics of volatility and intermittence, and from the perspective of power load of a power distribution network, along with the rise of new energy electric vehicles, the load power utilization has great randomness, and a great deal of uncertainty exists in a charging station combining an original power grid, the new energy power generation and the new energy electric vehicles, so that great influence and harm are caused to an original power system.
The energy storage system is used as the only system in the power grid which can be used as a power supply and a load at the same time, is used as one of key technologies for improving the flexibility of the power grid and improving the wind power and photovoltaic power generation capacities of a local power grid, and has the advantages of strong peak-load and frequency modulation capacity, load compensation, high response speed, high informatization automation degree, convenience in power grid dispatching and the like.
The invention provides a storage battery state-of-charge calculation method aiming at the problems that the traditional storage battery electric quantity estimation method has larger error and is influenced by battery aging in the charging and discharging of an energy storage system.
Disclosure of Invention
The invention provides a storage battery state of charge calculation method, which can accurately calculate the storage battery state of charge and reduce errors.
The invention specifically relates to a storage battery charge state calculation method, which comprises the following steps:
step (1): saving the state of charge value calculated last time as an initial state of charge value, initializing a time counter t to be 0, and setting a flag bit flag to be 0;
step (2): the time counter cumulatively adds one: t is t +1, and the charging and discharging current of the storage battery is collected;
and (3): judging whether the numerical value of the time counter is greater than the sampling period T or not, if so, entering the step (4); if not, returning to the step (2);
and (4): the flag bit flag is 1, the charging and discharging current of the storage battery is disturbed, and the terminal voltage of the storage battery is synchronously sampled;
and (5): calculating the internal resistance of the storage battery at the moment:
infor charging and discharging the battery current unFor the terminal voltage of the storage battery, N is the charging and discharging current and the terminal voltage quantity of the storage battery in pairs recorded by single disturbance;
and (6): calculating the battery at this timeElectromotive force: e.g. of the typem＝[(∑un)+Rn(∑in)]/N；
And (7): calculating the battery state of charge estimate
a1、a2、a3、b1、b2、b3C, d are weighting coefficients, k1、k2、k3Is a constant;
and (8): judging whether the initial value of the state of charge is larger than a low-power reference value, if so, entering a step (15); if not, entering the step (9);
and (9): calculating the charge and discharge electric quantity of the storage battery
Q0Setting the initial value of the state of charge as C, and setting the initial value of the state of charge as the polarization capacitance of the storage battery;
step (10): calculating the difference value between the estimated value of the state of charge of the storage battery and the standard value of the state of charge;
step (11): judging whether the difference value is larger than a difference value reference value, if so, entering a step (12); if not, entering the step (15);
step (12): judging the working condition of the storage battery, and if the working condition is a charging condition, entering a step (13); if the discharge state is detected, entering step (14);
step (13): calculating the state of charge of the storage battery as follows: qSOC＝Q0+Qt；
Step (14): calculating the state of charge of the storage battery as follows: qSOC＝Q0-Qt；
Step (15): calculating the state of charge of the storage battery as follows: qSOC＝Qg。
Compared with the prior art, the beneficial effects are: the charge state calculation method respectively calculates the charge states according to the electric quantity of the storage battery, and can overcome the defect of large error of the single estimation of the electric quantity by the traditional electric quantity estimation method.
Drawings
Fig. 1 is a schematic diagram illustrating steps of a method for calculating a state of charge of a storage battery according to the present invention.
Detailed Description
The following describes a specific embodiment of the method for calculating the state of charge of the storage battery according to the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, the state of charge calculation method of the present invention includes the following steps:
step (1): saving an initial value of the state of charge, setting an initialization time counter t to be 0, and setting a flag bit flag to be 0;
step (2): the time counter adds one cumulatively: t is t +1, and the charging and discharging current of the storage battery is collected;
and (3): judging whether the value of the time counter is greater than the sampling period T or not, if so, entering the step (4); if not, returning to the step (2);
and (4): the flag bit flag is 1, the charging and discharging current of the storage battery is disturbed, and the terminal voltage of the storage battery is synchronously sampled;
and (5): calculating the internal resistance of the storage battery at the moment:
infor charging and discharging current of the accumulator unThe voltage of the storage battery is N, and the charging and discharging current and the terminal voltage number of the paired storage batteries are recorded in a single disturbance mode;
and (6): calculating the electromotive force of the storage battery at the moment: e.g. of the typem＝[(∑un)+Rn(∑in)]/N；
And (7): calculating a battery state of charge estimate
a1、a2、a3、b1、b2、b3C, d are weighting coefficients, k1、k2、k3Is a constant;
and (8): judging whether the initial value of the state of charge is larger than a low-power reference value, if so, entering a step (15); if not, entering the step (9);
and (9): calculating the charge and discharge capacity of the storage battery
Q0The initial value of the state of charge is C, and the initial value of the state of charge is the polarization capacitance of the storage battery;
step (10): calculating the difference value between the estimated value of the state of charge of the storage battery and the standard value of the state of charge;
step (11): judging whether the difference value is larger than the difference value reference value, if so, entering the step (12); if not, entering the step (15);
step (12): judging the working condition of the storage battery, and if the working condition is the charging condition, entering a step (13); if the discharge state is detected, entering step (14);
step (13): calculating the state of charge of the storage battery as follows: qSOC＝Q0+Qt；
Step (14): calculating the state of charge of the storage battery as follows: qSOC＝Q0-Qt；
Step (15): calculating the state of charge of the storage battery as follows: qSOC＝Qg。
In the step (8), whether the initial value of the state of charge is larger than the reference value of the low electric quantity is judged,
if the charge state is larger than the preset charge state, accumulated errors easily exist, the capacity of the storage battery is changed under the condition of high temperature or severe current fluctuation, and after the charge and discharge electric quantity of the storage battery is calculated according to the step (9), the further accurate calculation is needed according to the discharge or charge state of the storage battery: the charging state: state of charge of the battery being QSOC＝Q0+Qt(ii) a And (3) discharging condition: state of charge of the battery being QSOC＝Q0-Qt；
If the capacity of the storage battery is not larger than the preset value, the capacity of the storage battery is not easy to change, and the estimated value of the state of charge of the storage battery in the step (7) is the state of charge value of the storage battery.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. A storage battery state of charge calculation method, characterized by, the state of charge calculation method includes the following steps:
step (1): saving the state of charge value calculated last time as an initial state of charge value, initializing a time counter t to be 0, and setting a flag bit flag to be 0;
step (2): the time counter cumulatively adds one: t is t +1, and the charging and discharging current of the storage battery is collected;
and (3): judging whether the numerical value of the time counter is greater than the sampling period T or not, if so, entering the step (4); if not, returning to the step (2);
and (4): the flag bit flag is 1, the charging and discharging current of the storage battery is disturbed, and the terminal voltage of the storage battery is synchronously sampled;
and (5): calculating the internal resistance of the storage battery at the moment:
infor charging and discharging the battery current unFor the terminal voltage of the storage battery, N is the charging and discharging current and the terminal voltage quantity of the storage battery in pairs recorded by single disturbance;
and (6): calculating the battery electromotive force at this time: e.g. of the typem＝[(∑un)+Rn(∑in)]/N；
And (7): calculating the battery state of charge estimate
a1、a2、a3、b1、b2、b3C, d are weighting coefficients, k1、k2、k3Is a constant;
and (8): judging whether the initial value of the state of charge is larger than a low-power reference value, if so, entering a step (15); if not, entering the step (9);
and (9): calculating the charge and discharge electric quantity of the storage battery
Q0Setting the initial value of the state of charge as C, and setting the initial value of the state of charge as the polarization capacitance of the storage battery;
step (10): calculating the difference value between the estimated value of the state of charge of the storage battery and the standard value of the state of charge;
step (11): judging whether the difference value is larger than a difference value reference value, if so, entering a step (12); if not, entering the step (15);
step (12): judging the working condition of the storage battery, and if the working condition is a charging condition, entering a step (13); if the discharge state is detected, entering step (14);
step (13): calculating the state of charge of the storage battery as follows: qSOC＝Q0+Qt；
Step (14): calculating the state of charge of the storage battery as follows: qSOC＝Q0-Qt；
Step (15): calculating the state of charge of the storage battery as follows: qSOC＝Qg。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471999A (en) * | 2021-08-10 | 2021-10-01 | 国网江苏省电力有限公司南通供电分公司 | User-oriented distributed power supply energy storage control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277898A (en) * | 2015-10-27 | 2016-01-27 | 浙江大学 | Battery charge state detecting method |
| CN111293336A (en) * | 2020-02-25 | 2020-06-16 | 南通大学 | Operation optimization method of all-vanadium redox flow battery energy storage system based on gravitation search algorithm |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277898A (en) * | 2015-10-27 | 2016-01-27 | 浙江大学 | Battery charge state detecting method |
| CN111293336A (en) * | 2020-02-25 | 2020-06-16 | 南通大学 | Operation optimization method of all-vanadium redox flow battery energy storage system based on gravitation search algorithm |
Non-Patent Citations (1)
| Title |
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| 杨清波 等: "基于多因素的储能***剩余电量估计方法", 《广东电力》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471999A (en) * | 2021-08-10 | 2021-10-01 | 国网江苏省电力有限公司南通供电分公司 | User-oriented distributed power supply energy storage control method |
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