CN114428214B - Battery standby power supply management monitoring method of variable pitch system - Google Patents
Battery standby power supply management monitoring method of variable pitch system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000012544 monitoring process Methods 0.000 title claims abstract description 40
- 238000011156 evaluation Methods 0.000 claims abstract description 62
- 238000007600 charging Methods 0.000 claims abstract description 60
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 230000036541 health Effects 0.000 claims abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims description 20
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- 230000005611 electricity Effects 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 9
- 239000003990 capacitor Substances 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000010280 constant potential charging Methods 0.000 abstract description 2
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- 238000010277 constant-current charging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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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Abstract
The invention discloses a battery standby power supply management monitoring method of a variable pitch system, which is applied to a lithium titanate battery, wherein a charging and discharging module is used for charging the battery at constant current and then at constant voltage, charging the battery at constant current to cut-off voltage, then performing constant voltage charging on the battery, and stopping charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module detects faults of the battery standby power supply when each link of the battery discharges; the battery management function module is used for carrying out residual electric quantity evaluation, health state evaluation and energy state evaluation on the battery; compared with a lead-acid storage battery and a super capacitor, the battery standby power management monitoring method of the pitch system can enable the lithium titanate battery to improve the safety of the standby power of the pitch system, improve the working efficiency and the service life of the battery, and greatly reduce the maintenance cost.
Description
Technical Field
The invention relates to the technical field of wind power management, in particular to a battery standby power management monitoring method of a variable pitch system.
Background
The standby power supply of the current pitch system mainly comprises a valve-regulated lead-acid storage battery and a super capacitor. The early-stage fan variable pitch standby power supply mostly adopts lead-acid storage batteries, and has the advantages of low cost, mature technology and the like; the super capacitor has the advantages of high power density, long cycle life, wide working temperature range, convenient management, no maintenance and the like. However, both of the above-mentioned standby power supplies have corresponding disadvantages:
The lead-acid storage battery has the defects of poor point placing characteristic, poor low-temperature performance, high failure rate, short service life, high maintenance cost and the like; in the life cycle of the wind turbine group, the lead-acid battery is usually replaced three or four times, and the cost of the lead-acid battery can reach more than 50% of the total investment of the pitch system.
Supercapacitors have low energy density (3-10 Wh/kg, about 1/10 of the battery) and relatively high cost due to the limited storage mechanism; therefore, when the super capacitor is used as a standby power supply, the feathering capability of the super capacitor is only 1-2 times.
Disclosure of Invention
The invention aims to solve the technical problem of providing a battery standby power management monitoring method of a pitch system, which can enable a lithium titanate battery to improve the safety of the battery standby power of the pitch system, improve the working efficiency and the service life of the battery and greatly reduce the maintenance cost compared with a lead-acid storage battery and a super capacitor.
In order to solve the technical problems, the invention provides a battery standby power management and monitoring method of a variable pitch system, which is applied to a lithium titanate battery and comprises a charge and discharge module, a fault monitoring module and a battery management function module, and is characterized by comprising the following steps: the charging and discharging module is used for charging the battery at constant current and then at constant voltage, charging the battery to cut-off voltage at constant current, then charging the battery at constant voltage, and stopping charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module detects faults of the battery standby power supply when each link of the battery discharges; the battery management function module is used for carrying out residual electric quantity evaluation, health state evaluation and energy state evaluation on the battery; the battery residual capacity evaluation comprises the steps of respectively correcting the battery residual capacity evaluation value according to whether the battery is completely kept still or not to obtain the battery residual capacity evaluation value; the battery state of health assessment is according to the initial remaining capacity value of the battery and the calculated value of the maximum capacity of the battery when the battery is charged; the battery energy state evaluation is carried out according to the average battery discharge voltage and the actual battery maximum capacity value to obtain the current residual energy of the battery.
Preferably, the battery management function module evaluates the remaining capacity of the battery, and when the battery is initially powered on, an initial remaining capacity value CAPocv0 of the battery is obtained by using an open circuit voltage method, and when the standby power supply of the battery is in a working state, the remaining capacity evaluation value of the standby power supply of the battery is updated in real time by using an ampere-hour integration method; when the standby power supply of the battery is in a standby mode or a low-current charge and discharge state, the battery is judged to be in a standing state, and the battery electric quantity evaluation values are respectively corrected according to whether the battery is completely standing or not, so that the battery electric quantity evaluation values are obtained:
battery remaining capacity evaluation value of battery backup power = CAPact/CAPmax;
dynamic battery remaining capacity evaluation value of battery backup power = SOC- (1-Kcap);
Wherein Kcap is a capacity conversion coefficient obtained by looking up a table according to the current temperature, a preset discharge rate of the charge and discharge module and a preset discharge current, CAPact is a battery actual residual capacity value, CAPocv is a battery initial residual capacity value obtained by calculating by an ampere-hour integrating method or a battery initial residual capacity value obtained by correcting by an open circuit voltage method after calculating by the ampere-hour integrating method, CAPmax is a maximum charge capacity value of the battery standby power supply, and SOC is a battery residual capacity evaluation value of the battery standby power supply.
Preferably, the specific step of "correcting the remaining capacity evaluation values of the battery backup power supply according to whether the battery backup power supply is completely stationary" includes:
When the battery standing time T is longer than the preset first standing time T0, correcting the battery residual capacity evaluation value of the battery by using an open circuit voltage method; when the battery standing time T is longer than the preset second standing time T1, a correction coefficient W is added, and the residual capacity value calculated by the ampere-hour integration method of the battery is corrected to obtain the actual residual capacity value of the battery:
CAPact＝W*CAPidt+(1-W)*CAPocv
wherein, T0 is the sufficient standing time of the battery, T1 is the insufficient standing time of the battery, CAPidt is the residual capacity value calculated by adopting an ampere-hour integration method of the battery.
Preferably, the battery management function module evaluates the health status of the battery, and after the driver of the battery management function module is powered on again or the battery is fully kept still, the battery management function module sets a charging correction ready flag bit and records the initial remaining capacity CAP_ CHARGEINI of the battery after standing; entering a charging mode and clearing a modifiable capacity flag bit; after the battery is charged, recording the Charge quantity CAPidt _charge of the battery, and juxtaposing a correctable capacity zone bit; and judging that the charging correction ready flag bit is valid and the charging modifiable capacity flag bit is valid, if both the charging correction ready flag bit and the charging modifiable capacity flag bit are valid, calculating the maximum capacity of the battery:
CAP_maxClc＝CAP_ChargeIni+CAPidt_Charge
Wherein, CAP_ maxClc is the calculated maximum capacity of the battery, CAP_ CHARGEINI is the initial remaining capacity of the battery after standing, CAPidt _charge is the capacity of the battery when charging.
Preferably, it is determined whether the calculated maximum battery capacity value is greater than an actual maximum battery capacity value, and if so, the actual maximum battery capacity value is corrected:
CAP_max＝CAP_max-0.2*(CAP_max-CAP_maxClc)
Wherein CAP_max is the actual value of the maximum capacity of the battery, and CAP_ maxClc is the calculated value of the maximum capacity of the battery.
Preferably, it is determined whether the calculated maximum battery capacity value is greater than an actual maximum battery capacity value, and if not, the actual maximum battery capacity value is corrected:
CAP_max＝CAP_max-0.5*(CAP_max-CAP_maxClc)；
After correction, clearing the charging correction ready flag bit and the correctable capacity flag bit;
Wherein CAP_max is the actual value of the maximum capacity of the battery, and CAP_ maxClc is the calculated value of the maximum capacity of the battery.
Preferably, the battery management function module performs energy state evaluation on the battery standby power supply, acquires a preset Discharge current i_work after initialization is completed, detects a current Discharge current i_discharge and a current ambient temperature T, acquires a battery Discharge average voltage u_ DisAve according to T, I _work and i_discharge through table lookup, and judges whether the battery is in a Discharge state currently, if not, the current residual energy of the battery is:
E_remain＝U_DisAve*DSOC*CAP_max*3.6
Where e_remain represents the current remaining energy of the battery, u_ DisAve is the battery discharge average voltage, cap_max is the actual value of the maximum capacity of the battery, and DSOC is the dynamic battery remaining capacity evaluation value.
Preferably, the battery management function module evaluates the energy state of the battery backup power supply, judges whether the battery backup power supply is in a discharging state at present, and detects the current motor power first if the battery backup power supply is in the discharging state, and then the current residual energy of the battery is as follows:
E_remain＝E_remain-P*Δt
where e_domain represents the current remaining energy of the battery, P represents the current power of the motor, and Δt represents the battery discharge time.
Preferably, the battery standby power management monitoring method of the pitch system further comprises a power grid state detection step of judging whether the battery enters a discharging mode; when the power grid abnormality is detected, the battery management function module switches the battery into a discharge monitoring mode; when a grid fault is detected, the battery management function module stops charging the battery.
After the method is adopted, the charging and discharging module is used for carrying out constant-current charging on the battery, then carrying out constant-voltage charging on the battery, and stopping charging when the charging current of the battery is smaller than the charging stop current; the fault monitoring module detects faults of the battery standby power supply when each link of the battery discharges; the battery management function module is used for carrying out residual electric quantity evaluation, health state evaluation and energy state evaluation on the battery; the battery residual capacity evaluation comprises the steps of respectively correcting the battery residual capacity evaluation value according to whether the battery is completely kept still or not to obtain the battery residual capacity evaluation value; the battery state of health assessment is according to the initial remaining capacity value of the battery and the calculated value of the maximum capacity of the battery when the battery is charged; the battery energy state evaluation is carried out according to the average battery discharge voltage and the actual value of the maximum battery capacity to obtain the current residual battery energy; compared with a lead-acid storage battery and a super capacitor, the battery standby power management monitoring method of the pitch system can enable the lithium titanate battery to improve the safety of the standby power of the pitch system, improve the working efficiency and the service life of the battery, and greatly reduce the maintenance cost.
Drawings
FIG. 1 is a flow chart of a battery backup power management monitoring method of a variable pitch system in charge and discharge management fault management state;
FIG. 2 is a flow chart of the battery remaining power evaluation of the battery backup power management monitoring method of the pitch system according to the present invention;
FIG. 3 is a flow chart of a battery actual capacity charge correction for a battery backup power management monitoring method of a pitch system according to the present invention;
FIG. 4 is a flow chart of battery state of health assessment of a battery backup power management monitoring method of a pitch system according to the present invention;
fig. 5 is a battery energy state evaluation flowchart of a battery backup power management monitoring method of a pitch system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, fig. 1 is a flow chart illustrating a fault management state of charge and discharge management in a battery backup power management monitoring method of a pitch system according to the present invention; the embodiment discloses a battery standby power management monitoring method of a variable pitch system, which is applied to a lithium titanate battery and comprises a charging and discharging module, a fault monitoring module and a battery management function module, and is characterized in that the method comprises the following steps: the charging and discharging module is used for charging the battery at constant current and then at constant voltage, charging the battery to cut-off voltage at constant current, then charging the battery at constant voltage, and stopping charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module detects faults of the battery standby power supply when each link of the battery discharges; the battery management function module is used for carrying out residual electric quantity evaluation, health state evaluation and energy state evaluation on the battery; the battery residual capacity evaluation comprises the steps of respectively correcting the battery electric capacity evaluation value according to whether the battery is completely kept still to obtain a battery residual capacity evaluation value of a battery standby power supply; the battery state of health assessment is according to the initial remaining capacity value of the battery and the calculated value of the maximum capacity of the battery when the battery is charged; the battery energy state evaluation is carried out according to the average battery discharge voltage and the actual battery maximum capacity value to obtain the current residual energy of the battery.
Example two
Referring to fig. 2 and 3, fig. 2 is a flowchart of a battery remaining power evaluation method for a battery backup power management and monitoring method of a pitch system according to the present invention; FIG. 3 is a flow chart of a battery actual capacity charge correction for a battery backup power management monitoring method of a pitch system according to the present invention; in this embodiment, the battery management function module evaluates the remaining battery power, and when the battery is initially powered on, obtains an initial remaining battery capacity value CAPocv by using an open circuit voltage method, and when the battery backup power is in a working state, updates the remaining battery power evaluation value of the battery backup power in real time by using an ampere-hour integration method; when the standby power supply of the battery is in a standby mode or a low-current charge and discharge state, the battery is judged to be in a standing state, and the battery electric quantity evaluation values are respectively corrected according to whether the battery is completely standing or not, so that the battery electric quantity evaluation values are obtained:
battery remaining capacity evaluation value= CAPact/CAPmax;
Dynamic battery remaining capacity evaluation value=soc- (1-Kcap);
Wherein Kcap is a capacity conversion coefficient obtained by looking up a table according to the current temperature, a preset discharge rate of the charge and discharge module and a preset discharge current, CAPact is a battery actual residual capacity value, CAPocv is a battery initial residual capacity value obtained by calculating by an ampere-hour integrating method or a battery initial residual capacity value obtained by correcting by an open circuit voltage method after calculating by the ampere-hour integrating method, CAPmax is a battery maximum charge capacity value, and SOC is a battery residual capacity evaluation value.
In this embodiment, the specific steps of "correcting the remaining capacity evaluation value of the battery backup power supply according to whether the battery backup power supply is completely stationary" include:
When the battery standing time T is longer than the preset first standing time T0, correcting the battery residual capacity evaluation value of the battery by using an open circuit voltage method; when the battery standing time T is longer than the preset second standing time T1, a correction coefficient W is added, and the residual capacity value calculated by the ampere-hour integration method of the battery is corrected to obtain the actual residual capacity value of the battery:
CAPact＝W*CAPidt+(1-W)*CAPocv
wherein, T0 is the sufficient standing time of the battery, T1 is the insufficient standing time of the battery, CAPidt is the residual capacity value calculated by adopting an ampere-hour integration method of the battery.
Example III
Referring to fig. 4, fig. 4 is a flowchart of a battery health status evaluation of a battery backup power management monitoring method of a pitch system according to the present invention;
In this embodiment, the battery management function module evaluates the state of health of the battery, and after the driver of the battery management function module is powered on again or the battery is fully left, sets a charging correction ready flag bit and records the initial remaining capacity cap_ CHARGEINI of the battery left; entering a charging mode and clearing a modifiable capacity flag bit; after the battery is charged, recording the Charge quantity CAPidt _charge of the battery, and juxtaposing a correctable capacity zone bit; and judging that the charging correction ready flag bit is valid and the charging modifiable capacity flag bit is valid, if both the charging correction ready flag bit and the charging modifiable capacity flag bit are valid, calculating the maximum capacity of the battery:
CAP_maxClc＝CAP_ChargeIni+CAPidt_Charge
Wherein, CAP_ maxClc is the calculated maximum capacity of the battery, CAP_ CHARGEINI is the initial remaining capacity of the battery after standing, CAPidt _charge is the capacity of the battery when charging.
In this embodiment, it is determined whether the calculated value of the maximum battery capacity is greater than the actual value of the maximum battery capacity, and if so, the actual value of the maximum battery capacity is corrected:
CAP_max＝CAP_max-0.2*(CAP_max-CAP_maxClc)
Wherein CAP_max is the actual value of the maximum capacity of the battery, and CAP_ maxClc is the calculated value of the maximum capacity of the battery.
In this embodiment, it is determined whether the calculated value of the maximum battery capacity is greater than the actual value of the maximum battery capacity, and if not, the actual value of the maximum battery capacity is corrected:
CAP_max＝CAP_max-0.5*(CAP_max-CAP_maxClc)；
After correction, clearing the charging correction ready flag bit and the correctable capacity flag bit;
Wherein CAP_max is the actual value of the maximum capacity of the battery, and CAP_ maxClc is the calculated value of the maximum capacity of the battery.
Example IV
Referring to fig. 5, fig. 5 is a flowchart illustrating a battery energy state evaluation method for a battery backup power management monitoring method of a pitch system according to the present invention.
In this embodiment, the battery management function module performs energy state evaluation on the battery standby power supply, acquires a preset Discharge current i_work after initialization is completed, detects a current Discharge current i_discharge and a current ambient temperature T, acquires a battery Discharge average voltage u_ DisAve according to T, I _work and i_discharge through table lookup, and determines whether the battery is currently in a Discharge state, if not, the current residual energy of the battery is:
E_remain＝U_DisAve*DSOC*CAP_max*3.6
Where e_remain represents the current remaining energy of the battery, u_ DisAve is the battery discharge average voltage, cap_max is the actual value of the maximum capacity of the battery, and DSOC is the dynamic battery remaining capacity evaluation value.
In this embodiment, the battery management function module evaluates the energy state of the battery, determines whether the battery is currently in a discharge state, and if the battery is in the discharge state, detects the current motor power first, then the current remaining energy of the battery is:
E_remain＝E_remain-P*Δt
where e_domain represents the current remaining energy of the battery, P represents the current power of the motor, and Δt represents the battery discharge time.
Example five
The battery standby power supply management monitoring method of the variable pitch system further comprises a power grid state detection step of judging whether the battery enters a discharging mode; when the power grid abnormality is detected, the battery management function module switches the battery into a discharge monitoring mode; when a grid fault is detected, the battery management function module stops charging the battery.
Compared with a lead-acid storage battery and a super capacitor, the battery standby power management monitoring method of the pitch system can enable the lithium titanate battery to improve the safety of the standby power of the pitch system, improve the working efficiency and the service life of the battery, and greatly reduce the maintenance cost.
It should be understood that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the descriptions of the present invention and the accompanying drawings, or direct or indirect application in other relevant technical fields, are included in the scope of the present invention.
Claims (7)
1. The battery standby power supply management monitoring method of the variable pitch system is applied to a lithium titanate battery and comprises a charging and discharging module, a fault monitoring module and a battery management function module, and is characterized by comprising the following steps: the charging and discharging module is used for charging the battery at constant current and then at constant voltage, charging the battery to cut-off voltage at constant current, then charging the battery at constant voltage, and stopping charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module detects faults of the battery standby power supply when each link of the battery discharges; the battery management function module is used for carrying out residual electric quantity evaluation, health state evaluation and energy state evaluation on the battery; the battery residual capacity evaluation comprises the steps of respectively correcting the battery residual capacity evaluation value according to whether the battery is completely kept still or not to obtain the battery residual capacity evaluation value; the battery state of health assessment is according to the initial remaining capacity value of the battery and the calculated value of the maximum capacity of the battery when the battery is charged; the battery energy state evaluation is carried out according to the average battery discharge voltage and the actual value of the maximum battery capacity to obtain the current residual battery energy;
The battery management function module evaluates the residual electric quantity of the battery, obtains an initial residual capacity value CAPocv0 of the battery by using an open-circuit voltage method when the battery is initially electrified, and updates the residual electric quantity evaluation value of the battery standby power supply in real time by using an ampere-time integration method when the battery standby power supply is in a working state; when the standby power supply of the battery is in a standby mode or a low-current charge and discharge state, the battery is judged to be in a standing state, and the battery electric quantity evaluation values are respectively corrected according to whether the battery is completely standing or not, so that the battery electric quantity evaluation values are obtained:
；
；
Wherein Kcap is a capacity conversion coefficient obtained by looking up a table according to the current temperature, the preset discharge rate of the charge-discharge module and the discharge current, The actual residual capacity value of the battery is CAPocv, the initial residual capacity value of the battery calculated by an ampere-hour integrating method or the initial residual capacity value of the battery calculated by the ampere-hour integrating method and corrected by an open circuit voltage method, CAPmax is the maximum charge capacity value of the battery, and the SOC is the residual capacity evaluation value of the battery;
the specific steps of respectively correcting the residual capacity evaluation values of the battery standby power supply according to whether the battery standby power supply is completely stationary include:
When the battery standing time T is longer than the preset first standing time T0, correcting the battery residual capacity evaluation value of the battery by using an open circuit voltage method; when the battery standing time T is longer than the preset second standing time T1, a correction coefficient W is added, and the residual capacity value calculated by the ampere-hour integration method of the battery is corrected to obtain the actual residual capacity value of the battery:
wherein, T0 is the sufficient standing time of the battery, T1 is the insufficient standing time of the battery, CAPidt is the residual capacity value calculated by adopting an ampere-hour integration method of the battery.
2. The method for monitoring battery backup power management of a pitch system according to claim 1, wherein the battery management function module evaluates a state of health of the battery, and after a driver of the battery management function module is powered on again or the battery is fully stationary, sets a charging correction ready flag bit and records a remaining initial capacity cap_ CHARGEINI of the battery stationary; entering a charging mode and clearing a modifiable capacity flag bit; after the battery is charged, recording the Charge quantity CAPidt _charge of the battery, and juxtaposing a correctable capacity zone bit; and judging that the charging correction ready flag bit is valid and the charging modifiable capacity flag bit is valid, if both the charging correction ready flag bit and the charging modifiable capacity flag bit are valid, calculating the maximum capacity of the battery:
Wherein, CAP_ maxClc is the calculated maximum capacity of the battery, CAP_ CHARGEINI is the initial remaining capacity of the battery after standing, CAPidt _charge is the capacity of the battery when charging.
3. The method for battery backup power management monitoring of a pitch system according to claim 2,
Judging whether the calculated value of the maximum capacity of the battery is larger than the actual value of the maximum capacity of the battery, and if so, correcting the actual value of the maximum capacity of the battery:
wherein, As the actual value of the maximum capacity of the battery,A value is calculated for the maximum capacity of the battery.
4. The method for battery backup power management monitoring of a pitch system according to claim 2,
Judging whether the calculated value of the maximum capacity of the battery is larger than the actual value of the maximum capacity of the battery, and if not, correcting the actual value of the maximum capacity of the battery:
；
After correction, clearing the charging correction ready flag bit and the correctable capacity flag bit;
wherein, As the actual value of the maximum capacity of the battery,A value is calculated for the maximum capacity of the battery.
5. The method of claim 1, wherein the battery backup power management monitoring of the pitch system,
The battery management function module evaluates the energy state of the battery standby power supply, acquires a preset Discharge current I_work after initialization is completed, detects a current Discharge current I_discharge and a current environment temperature T, acquires a battery Discharge average voltage U_ DisAve according to T, I _work and I_discharge through table lookup, judges whether the battery is in a Discharge state currently, and if not, the current residual energy of the battery is as follows:
Where E_remain represents the current remaining energy of the battery, U_ DisAve is the battery discharge average voltage, CAP_max is the actual value of the maximum capacity of the battery, And (5) dynamically evaluating the residual electricity of the battery for the standby power supply of the battery.
6. The method of claim 1, wherein the battery backup power management monitoring of the pitch system,
The battery management function module evaluates the energy state of the battery, judges whether the battery is in a discharging state at present, and detects the current motor power first if the battery is in the discharging state, wherein the current residual energy of the battery is as follows:
Where e_domain represents the current remaining energy of the battery, P represents the current power of the motor, Δt represents the battery discharge time.
7. The battery backup power management monitoring method of a pitch system according to claim 1, further comprising a grid state detection step of determining whether the battery enters a discharge mode; when the power grid abnormality is detected, the battery management function module switches the battery into a discharge monitoring mode; when a grid fault is detected, the battery management function module stops charging the battery.
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| CN109669138A (en) * | 2018-12-28 | 2019-04-23 | 天能电池集团有限公司 | A kind of method of precise determination power lead storage battery residual capacity |
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