CN114428214A - Management and monitoring method for battery standby power supply of variable pitch system - Google Patents
Management and monitoring method for battery standby power supply of variable pitch system Download PDFInfo
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Abstract
The invention discloses a management and monitoring method for standby power supply of a battery of a pitch system, which is applied to a lithium titanate battery.A charge-discharge module charges the battery at a constant current and then at a constant voltage, charges the battery at a constant current to a cut-off voltage at a certain current, then charges the battery at a constant voltage, and stops charging when the charging current of the battery is less than the charging cut-off current; the fault monitoring module carries out fault detection on the battery standby power supply when each link of the battery discharges; the battery management function module is used for evaluating the residual electric quantity, the health state and the energy state of 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 supply management, in particular to a battery standby power supply management monitoring method of a pitch system.
Background
At present, a standby power supply of a variable pitch system mainly comprises two types of valve-controlled lead-acid storage batteries and a super capacitor. The lead-acid storage battery is mostly adopted as the variable-pitch standby power supply of the early-stage fan, and the variable-pitch standby power supply 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 backup power supplies have respective disadvantages:
the lead-acid storage battery has the defects of poor discharge characteristics, poor low-temperature performance, high failure rate, short service life, high maintenance cost and the like; in the life cycle of the fan unit, 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 variable pitch system.
Supercapacitors have low energy density (3-10Wh/kg, about 1/10 for batteries) due to their limited storage mechanism, and their cost is relatively high; therefore, when the super capacitor is used as a standby power supply, the feathering capacity is only 1-2 times.
Disclosure of Invention
Compared with a lead-acid storage battery and a super capacitor, the battery standby power management monitoring method of the pitch system can improve the safety of the standby power of the pitch system by a lithium titanate battery, improve the working efficiency and the service life of the battery, and greatly reduce the maintenance cost.
In order to solve the technical problem, the invention provides a battery standby power management monitoring method of a pitch system, which is applied to a lithium titanate battery and comprises a charge-discharge module, a fault monitoring module and a battery management function module, and is characterized by comprising the following steps of: the charging and discharging module charges the battery at constant current and constant voltage, charges the battery at constant current to cut-off voltage at a certain current, then charges the battery at constant voltage, and stops charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module carries out fault detection on the battery standby power supply when each link of the battery discharges; the battery management function module is used for evaluating the residual electric quantity, the health state and the energy state of the battery; the battery residual capacity evaluation comprises respectively correcting the battery capacity evaluation values according to whether the battery is completely static or not to obtain the battery residual capacity evaluation value; the battery health state evaluation obtains a calculated value of the maximum capacity of the battery according to the initial residual capacity value of the battery during standing and the capacity value of the battery during charging; and the battery energy state evaluation is used for obtaining the current residual energy of the battery according to the average discharge voltage of the battery and the actual value of the maximum capacity of the battery.
Preferably, the battery management function module evaluates the remaining capacity of the battery, acquires an initial remaining capacity value CAPocv0 of the battery by using an open-circuit voltage method during initial power-on, and updates the remaining capacity evaluation value of the battery backup power supply in real time by using an ampere-hour integration method when the battery backup power supply is in a working state; when the battery standby power supply is in a standby mode or a low-current charging and discharging state, judging that the battery is in a standing state, and respectively correcting the estimated value of the electric quantity of the battery according to whether the battery completely stands to obtain:
the evaluation value of the residual battery capacity of the battery backup power supply is CAPact/CAPmax;
the estimation value of the residual power of the dynamic battery of the battery backup power supply is equal to SOC- (1-Kcap);
the method comprises the steps that Kcap is a capacity conversion coefficient obtained by table look-up according to current temperature, preset discharge multiplying power of a charge and discharge module and discharge current, CAPact is an actual residual capacity value of a battery, CAPocv0 utilizes an initial residual capacity value of the battery calculated by a ampere-hour integration method or utilizes an open-circuit voltage method to correct after the calculation of the ampere-hour integration method to obtain the initial residual capacity value of the battery, CAPmax is a maximum charge capacity value of a battery backup power supply, and SOC is an estimated value of the residual capacity of the battery backup power supply.
Preferably, the step of respectively correcting the estimated remaining power values of the battery backup power supply according to whether the battery backup power supply is completely static comprises the following specific steps:
when the battery standing time T is greater than a preset first standing time T0, correcting the estimated value of the battery residual capacity of the battery by using an open-circuit voltage method; when the battery standing time T is larger than a preset second standing time T1, adding a correction coefficient W, and correcting the residual capacity value calculated by the battery by adopting an ampere-hour integration method 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, and CAPidt is the residual capacity value calculated by the battery by adopting an ampere-hour integration method.
Preferably, the battery management function module evaluates the state of health of the battery, sets a charging correction ready flag bit and records the initial remaining capacity CAP _ ChargeIni of the battery after the driver of the battery management function module is powered on again or the battery is fully static; entering a charging mode and clearing a correctable capacity flag bit; after the battery is charged, recording the charging capacity CAPidt _ Charge of the battery and juxtaposing a correctable capacity flag bit; and judging that the charging correction ready zone bit is valid and the charging correction capacity zone bit is valid, if both are valid, calculating the maximum capacity of the battery:
CAP_maxClc＝CAP_ChargeIni+CAPidt_Charge
the CAP _ maxClc is a calculated value of the maximum capacity of the battery, the CAP _ CHARGEIni is an initial residual capacity value of the battery during standing, and the CAPidt _ Charge is a capacity value of the battery during charging.
Preferably, 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.
Preferably, it is determined whether the calculated value of the maximum capacity of the battery is greater than the actual value of the maximum capacity of the battery, and if not, the actual value of the maximum capacity of the battery is corrected:
CAP_max＝CAP_max-0.5*(CAP_max-CAP_maxClc)；
clearing the charging correction ready flag bit and the correctable capacity flag bit after correction;
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 backup 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 _ dis ave by looking up a table according to T, I _ work and I _ Discharge, and determines whether the battery is currently in a Discharge state, and if not, the current remaining energy of the battery is:
E_remain＝U_DisAve*DSOC*CAP_max*3.6
wherein, E _ remaining represents the current remaining energy of the battery, U _ DisAve is the average voltage of battery discharge, CAP _ max is the actual value of the maximum capacity of the battery, and DSOC is the estimated value of the remaining energy of the dynamic battery.
Preferably, the battery management function module performs energy state evaluation on the battery backup power supply, determines whether the battery backup power supply is in a discharging state, and if the battery backup power supply is in the discharging state, detects the current motor power first, where the current remaining energy of the battery is:
E_remain＝E_remain-P*Δt
wherein, E _ remaining represents the current residual energy of the battery, P represents the current power of the motor, and delta t represents the time when the battery releases electric energy.
Preferably, the method for managing and monitoring the standby power supply of the battery of the pitch system further comprises a power grid state detection step of judging 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 the power grid fault is detected, the battery management function module stops charging the battery.
After the method is adopted, the charging and discharging module performs constant current charging and then constant voltage charging on the battery, performs constant current charging to cut-off voltage at a certain current, performs constant voltage charging on the battery, and stops charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module carries out fault detection on the battery standby power supply when each link of the battery discharges; the battery management function module is used for evaluating the residual electric quantity, the health state and the energy state of the battery; the battery residual capacity evaluation comprises respectively correcting the battery capacity evaluation values according to whether the battery is completely static or not to obtain the battery residual capacity evaluation value; the battery health state evaluation obtains a calculated value of the maximum capacity of the battery according to the initial residual capacity value of the battery during standing and the capacity value of the battery during charging; the battery energy state evaluation is used for obtaining the current residual energy of the battery according to the average discharge voltage of the battery and the actual value of the maximum capacity of 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.
Drawings
FIG. 1 is a flow chart of a charging and discharging management fault management state of a battery standby power management monitoring method of a variable pitch system according to the present invention;
FIG. 2 is a battery remaining power evaluation flowchart of a battery backup power management monitoring method of a pitch system according to the present invention;
FIG. 3 is a battery actual capacity charging correction flow chart of the battery standby power management monitoring method of the pitch system;
FIG. 4 is a battery health status evaluation flowchart of a battery backup power management monitoring method of a pitch control system according to the present invention;
fig. 5 is a battery energy state evaluation flowchart of a battery standby power management monitoring method of a pitch system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, fig. 1 is a flow chart of a charging and discharging management fault management state of a battery standby 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 pitch system, which is applied to a lithium titanate battery and comprises a charge-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 charges the battery at constant current and then at constant voltage, charges the battery at constant current to cut-off voltage at a certain current, then charges the battery at constant voltage, and stops charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module carries out fault detection on the battery standby power supply when each link of the battery discharges; the battery management function module is used for evaluating the residual electric quantity, the health state and the energy state of the battery; the battery residual capacity evaluation comprises respectively correcting the battery residual capacity evaluation values according to whether the battery is completely static or not to obtain the battery residual capacity evaluation value of the battery standby power supply; the battery health state evaluation obtains a calculated value of the maximum capacity of the battery according to the initial residual capacity value of the battery during standing and the capacity value of the battery during charging; and the battery energy state evaluation is used for obtaining the current residual energy of the battery according to the average discharge voltage of the battery and the actual value of the maximum capacity of the battery.
Example two
Referring to fig. 2 and fig. 3, fig. 2 is a battery remaining power evaluation flow chart of a battery standby power management monitoring method of a pitch system according to the present invention; FIG. 3 is a battery actual capacity charging correction flow chart of the battery standby power management monitoring method of the pitch system; in this embodiment, the battery management function module evaluates the remaining capacity of the battery, acquires an initial remaining capacity value CAPocv0 of the battery by using an open-circuit voltage method during initial power-on, and updates the remaining capacity evaluation value of the battery backup power supply in real time by using an ampere-hour integration method when the battery backup power supply is in a working state; when the battery standby power supply is in a standby mode or a low-current charging and discharging state, judging that the battery is in a standing state, and respectively correcting the estimated value of the electric quantity of the battery according to whether the battery completely stands to obtain:
the estimated value of the residual battery capacity is CAPact/CAPmax;
the dynamic battery remaining capacity estimation value is equal to SOC- (1-Kcap);
the method comprises the steps that Kcap is a capacity conversion coefficient obtained by table look-up according to current temperature, preset discharge multiplying power of a charge and discharge module and discharge current, CAPact is an actual residual capacity value of a battery, CAPocv0 is an initial residual capacity value of the battery obtained by calculation through a ampere-hour integration method or an initial residual capacity value of the battery obtained by correction through an open-circuit voltage method after calculation through the ampere-hour integration method, CAPmax is a maximum charge capacity value of the battery, and SOC is an estimated value of the residual capacity of the battery.
In this embodiment, the specific steps of "respectively correcting the remaining power evaluation values of the battery backup power according to whether the battery backup power is completely stationary" include:
when the battery standing time T is greater than a preset first standing time T0, correcting the estimated value of the battery residual capacity of the battery by using an open-circuit voltage method; when the battery standing time T is larger than a preset second standing time T1, adding a correction coefficient W, and correcting the residual capacity value calculated by the battery by adopting an ampere-hour integration method 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, and CAPidt is the residual capacity value calculated by the battery by adopting an ampere-hour integration method.
EXAMPLE III
Referring to fig. 4, fig. 4 is a battery health status evaluation flowchart of a battery standby power management monitoring method of a pitch system according to the present invention;
in this embodiment, the battery management function module performs state of health evaluation on the battery, sets a charging correction ready flag bit and records an initial remaining capacity CAP _ ChargeIni of the battery after a driver of the battery management function module is powered on again or the battery is sufficiently stationary; entering a charging mode and clearing a correctable capacity flag bit; after the battery is charged, recording the charging capacity CAPidt _ Charge of the battery and juxtaposing a correctable capacity flag bit; and judging that the charging correction ready flag bit is valid and the charging correction capacity flag bit is valid, and if the charging correction ready flag bit and the charging correction capacity flag bit are both valid, calculating the maximum capacity of the battery:
CAP_maxClc＝CAP_ChargeIni+CAPidt_Charge
the CAP _ maxClc is a calculated value of the maximum capacity of the battery, the CAP _ CHARGEIni is an initial residual capacity value of the battery during standing, and the CAPidt _ Charge is a capacity value of the battery during 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 the correction is finished, clearing a charging correction preparation zone bit and a correctable capacity zone 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 four
Referring to fig. 5, fig. 5 is a battery energy state evaluation flowchart of a battery standby 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 backup 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 by looking up a table according to T, I _ work and I _ Discharge, and determines whether the battery is currently in a Discharge state, and if not, the current remaining energy of the battery is:
E_remain＝U_DisAve*DSOC*CAP_max*3.6
wherein, E _ remaining represents the current remaining energy of the battery, U _ DisAve is the average voltage of battery discharge, CAP _ max is the actual value of the maximum capacity of the battery, and DSOC is the estimated value of the remaining energy of the dynamic battery.
In this embodiment, the battery management function module performs energy state evaluation on the battery, determines whether the battery is in a discharging state, and if the battery is in the discharging state, detects the current motor power first, where the current remaining energy of the battery is:
E_remain＝E_remain-P*Δt
wherein, E _ remaining represents the current residual energy of the battery, P represents the current power of the motor, and delta t represents the time when the battery releases electric energy.
EXAMPLE five
The battery standby power management monitoring method of the variable pitch system further comprises a power grid state detection step of judging 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 the power 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 above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A battery standby power management monitoring method of a pitch control system is applied to a lithium titanate battery and comprises a charge-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 charges the battery at constant current and then at constant voltage, charges the battery at constant current to cut-off voltage at a certain current, then charges the battery at constant voltage, and stops charging when the charging current of the battery is smaller than the charging cut-off current; the fault monitoring module carries out fault detection on the battery standby power supply when each link of the battery discharges; the battery management function module is used for evaluating the residual electric quantity, the health state and the energy state of the battery; the battery residual capacity evaluation comprises respectively correcting the battery capacity evaluation values according to whether the battery is completely static or not to obtain the battery residual capacity evaluation value; the battery health state evaluation obtains a calculated value of the maximum capacity of the battery according to the initial residual capacity value of the battery during standing and the capacity value of the battery during charging; and the battery energy state evaluation is used for obtaining the current residual energy of the battery according to the average discharge voltage of the battery and the actual value of the maximum capacity of the battery.
2. The method for managing and monitoring the battery standby power supply of the pitch system according to claim 1, wherein the battery management function module evaluates the remaining capacity of the battery, obtains an initial remaining capacity value CAPocv0 of the battery by using an open-circuit voltage method during initial power-on, and updates the remaining capacity evaluation value of the battery standby power supply in real time by using an ampere-hour integration method when the battery standby power supply is in a working state; when the battery standby power supply is in a standby mode or a low-current charging and discharging state, judging that the battery is in a standing state, and respectively correcting the estimated value of the electric quantity of the battery according to whether the battery completely stands to obtain:
the estimated value of the residual battery capacity is CAPact/CAPmax;
the dynamic battery remaining capacity estimation value is equal to SOC- (1-Kcap);
the method comprises the steps of obtaining a capacity conversion coefficient by looking up a table according to a current temperature, a preset discharge multiplying power of a charge and discharge module and a discharge current, obtaining CAPact as an actual residual capacity value of a battery, obtaining an initial residual capacity value of the battery by CAPocv0 through calculation by using an ampere-hour integration method or obtaining an initial residual capacity value of the battery through correction by using an open-circuit voltage method after calculation by using the ampere-hour integration method, obtaining a maximum charge capacity value of the battery by CAPmax, and obtaining an SOC (state of charge) estimation value of the residual capacity of the battery.
3. The method for managing and monitoring the battery standby power supply of the pitch system according to claim 2, wherein the step of respectively correcting the estimated value of the remaining capacity of the battery standby power supply according to whether the battery standby power supply is completely static comprises the following steps:
when the battery standing time T is greater than a preset first standing time T0, correcting the estimated value of the battery residual capacity of the battery by using an open-circuit voltage method; when the battery standing time T is larger than a preset second standing time T1, adding a correction coefficient W, and correcting the residual capacity value calculated by the battery by adopting an ampere-hour integration method 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, and CAPidt is the residual capacity value calculated by the battery by adopting an ampere-hour integration method.
4. The battery standby power management monitoring method of the pitch system according to claim 1, wherein the battery management function module evaluates the state of health of the battery, sets a charging correction ready flag position and records the initial remaining capacity CAP _ ChargeIni of the battery standing after a driver of the battery management function module is powered up again or the battery is sufficiently standing; entering a charging mode and clearing a correctable capacity flag bit; after the battery is charged, recording the charging capacity CAPidt _ Charge of the battery and juxtaposing a correctable capacity flag bit; and judging that the charging correction ready flag bit is valid and the charging correction capacity flag bit is valid, and if the charging correction ready flag bit and the charging correction capacity flag bit are both valid, calculating the maximum capacity of the battery:
CAP_maxClc＝CAP_ChargeIni+CAPidt_Charge
the CAP _ maxClc is a calculated value of the maximum capacity of the battery, the CAP _ CHARGEIni is an initial residual capacity value of the battery during standing, and the CAPidt _ Charge is a capacity value of the battery during charging.
5. The method for monitoring battery backup power management of a pitch system according to claim 4,
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:
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.
6. The method for monitoring battery backup power management of a pitch system according to claim 4,
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:
CAP_max＝CAP_max-0.5*(CAP_max-CAP_maxClc)；
clearing the charging correction ready flag bit and the correctable capacity flag bit after correction;
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.
7. The method for monitoring battery backup power management of a pitch system according to claim 2,
the battery management function module carries out energy state evaluation on a battery standby power supply, acquires preset Discharge current I _ work after initialization is completed, detects current Discharge current I _ Discharge and current environment temperature T, acquires battery Discharge average voltage U _ DisAve through table lookup according to T, I _ work and I _ Discharge, judges whether the battery is in a Discharge state currently, and if the battery is not in the Discharge state, the current residual energy of the battery is as follows:
E_remain＝U_DisAve*DSOC*CAP_max*3.6
wherein, E _ remaining represents the current remaining energy of the battery, U _ DisAve is the average voltage of battery discharge, CAP _ max is the actual value of the maximum capacity of the battery, and DSOC is the estimated value of the remaining energy of the dynamic battery of the battery backup power supply.
8. The method for monitoring battery backup power management of a pitch system according to claim 2,
the battery management function module evaluates the energy state of the battery, judges whether the battery is in a discharging state at present, and if the battery is in the discharging state, detects the power of the current motor first, so that the current residual energy of the battery is as follows:
E_remain＝E_remain-P*△t
wherein, E _ remaining represents the current residual energy of the battery, P represents the current power of the motor, and Deltat represents the time for which the battery releases electric energy.
9. The battery standby power management monitoring method of the pitch system according to claim 2, further comprising a grid state detection step of judging 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 the power grid fault is detected, the battery management function module stops charging the battery.
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| CN115308645A (en) * | 2022-07-14 | 2022-11-08 | 国电宁波风电开发有限公司 | Parameter configuration standardization method for variable pitch control system |
| CN116930780A (en) * | 2023-09-19 | 2023-10-24 | 惠州锐鉴兴科技有限公司 | Intelligent electric quantity detection method, detection device and computer readable storage medium |
| CN116930780B (en) * | 2023-09-19 | 2024-02-23 | 惠州锐鉴兴科技有限公司 | Intelligent electric quantity detection method, detection device and computer readable storage medium |
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