CN102495372B - Detection method of accumulator capacity of variable-pitch system of wind turbine generator - Google Patents
Detection method of accumulator capacity of variable-pitch system of wind turbine generator Download PDFInfo
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- CN102495372B CN102495372B CN201110388537.6A CN201110388537A CN102495372B CN 102495372 B CN102495372 B CN 102495372B CN 201110388537 A CN201110388537 A CN 201110388537A CN 102495372 B CN102495372 B CN 102495372B
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Abstract
The invention provides a detection method of accumulator capacity of a variable-pitch system of a wind turbine generator. In the detection method, the health situation of an accumulator is judged by utilizing the voltage variation when the accumulator discharges electricity, the aging rate of the accumulator is calculated, and the accumulator capacity is calculated by a product of a current open circuit voltage of the accumulator and the aging rate. The method comprises the following concrete steps of: (1) detecting terminal voltage and discharge current of the accumulator when the accumulator of the variable-pitch system discharges electricity; (2) recording terminal voltage drop and discharge current of the accumulator every other 1s in the accumulator discharging process, and calculating the ratio of the voltage drop to the discharge capacity; (3) looking up a table to obtain the aging rate of the accumulator according to the ratio of the voltage drop to the discharge capacity and the discharge current; and (4) measuring the terminal voltage of the accumulator under a condition that the accumulator is in open circuit, multiplying the open circuit voltage by the aging rate of the accumulator to obtain the current capacity of the accumulator.
Description
Technical field
The present invention relates to wind generating set pitch control apart from detection method of accumulator capacity.
Background technology
At present generally adopt accumulator power supply in support in the pitch-variable system of wind-power electricity generation, when electrical network breaks down, by storage battery power supply, make the unit feathering.If the accumulator capacity deficiency can cause the unit in case of emergency can't feathering, when serious, can cause the unit driving.
The method that accumulator capacity detects at present mainly contains three kinds: (1) open-circuit voltage method; (2) accumulator internal resistance method, the internal resistance of measuring accumulator by heavy-current discharge, the capacity of internal resistance resistance reaction accumulator.(3) energy accumulation approach, calculate the capacity of battery by current integration.
First method is to show the residual capacity of accumulator by the open-circuit voltage of test accumulator, and its ultimate principle is based on certain known relation existed between battery tension and residual capacity.But this method can not detect the degree of aging of accumulator, although higher its capacity of its terminal voltage may be very low after accumulator is aging.
Second method is to judge the actual capacity of accumulator by the internal resistance of test valve-regulated lead-acid battery, and residual capacity and accumulator internal resistance have certain fixed relationship.This method generally need to record by the mode of heavy-current discharge the internal resistance of accumulator, needs configuration high-precision high-power discharge resistance, and the pick-up unit volume is large, is not easy to install or be carried in the pitch-variable system of wind power generating set.
The third method is calculated battery capacity by current integration, and this method is used for a long time and can be produced cumulative errors, needs the periodic calibration accumulator capacity, and maintenance workload is larger, is not suitable for being applied in the pitch-variable system of wind-powered electricity generation unit.
CN 102074984A " mobile terminal of on-line monitoring battery electric quantity and detection method thereof " has proposed a kind of battery capacity pick-up unit and method based on energy-storage units, its shortcoming is to have increased energy-storage units, not being suitable for large-capacity battery pack detects, the method need to increase accumulator to the energy-storage units logic control of discharging, and is not easy to be applied to pitch-variable system; CN 101814758A " for the discharge circuit of capacity detector for storage battery of electric bicycle " has proposed a kind of accumulator capacity testing circuit based on the conductive discharge method, during electric discharge, by power tube controlled discharge electric current, adopt the method for power tube controlled discharge electric current to increase hardware cost.
Existing detection method of accumulator capacity, because the testing circuit volume is large, need the shortcomings such as increase battery discharging control procedure, hardware cost height, is not suitable for being applied in pitch-variable system.
Summary of the invention
The object of the invention be to overcome existing detection method of accumulator capacity need to increase hardware cost high, affect the shortcomings such as the control of pitch-controlled system normal logic, pick-up unit volume are large, a kind of method that provides accumulator capacity of variable-pitch system of wind turbine generator to detect can detect the capacity of accumulator on the basis that does not change the pitch-variable system normal operation mode by online mode.
In order to achieve the above object, the present invention is by the following technical solutions:
The present invention is according to the self-characteristic of accumulator, and battery voltage becomes certain relation with battery dump energy, and estimates the aging conditions of accumulator according to accumulator relation between ageing rate and accumulator ampere-hour pressure drop VPQ under different discharge currents.Adopt programmable logic controller (PLC) to detect accumulator capacity by steps such as battery discharging voltage detecting, battery discharging current detecting and the calculating of accumulator ageing rate.
Programmable logic controller (PLC) PLC, voltage measurement module, current measurement module, the contactor of described method based in pitch-controlled system, the components and parts such as change oar motor carry out capacity check, and do not change the normal steering logic of pitch-controlled system.
When wind-powered electricity generation unit feathering, described contactor closure, battery discharging, now programmable logic controller (PLC) detects the terminal voltage of accumulator by voltage measurement module, detects the discharge current of accumulator by current measurement module.Programmable logic controller (PLC) calculates discharge electricity amount according to discharge current, calculates the poor ratio with discharge capacity of single step of releasing piezoelectric voltage every 1s, that is:
In above formula, definition VPQ is the pressure drop of accumulator ampere-hour, the pressure drop of the 1Ah battery terminal voltage that discharges, v
kfor current battery terminal voltage, v
k-1for a upper computation period cell voltage, i is the battery discharging electric current, and Δ Q is the battery discharging electric weight, is the integration of current i.Obtain the ageing rate of current accumulator by looking into ampere-hour pressure drop and ageing rate relation table according to the VPQ value.
Repeat said process, until discharge process finishes.In order to improve accuracy of detection, the ageing rate that whole discharge process is obtained averages, and obtains the current ageing rate of battery.
After electric discharge finishes, contactor disconnects, and programmable logic controller (PLC) PLC measures the open-circuit voltage of accumulator by voltage measurement module, and according to open-circuit voltage, ageing rate, cell voltage and capacity relationship are calculated current accumulator capacity.Computing formula is as follows:
Q＝Agc×f(v)
In above formula, Agc is ageing rate, and v is battery open-circuit voltage, and f (v) is the function of accumulator capacity to voltage, and this function is provided by accumulator manufacturer or accumulator manufacturer offer curves, and the mode by matching obtains.
Pitch-controlled system accumulator capacity online test method of the present invention can detect online the capacity of accumulator under the prerequisite that does not change the pitch-variable system logic control.The present invention does not increase the hardware device of pitch-variable system, and other detection method cost is low relatively.
The accompanying drawing explanation
Fig. 1 pitch-controlled system accumulator capacity detects schematic diagram;
Fig. 2 pitch-controlled system battery discharging process voltage and current curve.
Embodiment:
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
The present invention is at first according to battery behavior, sets up the relation table of accumulator ampere-hour pressure drop VPQ and ageing rate under different discharge current conditions, stores in the data storage area of programmable logic controller (PLC) (PLC); The new cell voltage and the capacity relationship that according to battery manufacturer, provide, simulate the relation function Q=f (V) of voltage and capacity.
According to the self-characteristic of accumulator, battery voltage becomes certain relation with battery dump energy, and estimates the aging conditions of accumulator according to accumulator relation between ageing rate and accumulator ampere-hour pressure drop VPQ under different discharge currents.
As shown in Figure 1, voltage measurement module 111 is in parallel with accumulator, accumulator is connected to and becomes oar motor 114 two ends by contactor K1, and current measurement module 112 is connected in major loop, and the measurement output of voltage measurement module 111 and current measurement module 112 is connected to the analog input port of PLC.Described current measurement module 112 is for measuring the discharge current of accumulator, voltage acquisition module 111 is for measuring the terminal voltage of accumulator, PLC113 is the computing unit that accumulator capacity detects, and realizes the functions such as data processing, operation, becomes the discharge load that oar motor work 114 is accumulator.Discharge current and the terminal voltage of measurement accumulator when programmable logic controller (PLC) (PLC) discharges to becoming the oar motor at accumulator, programmable logic controller (PLC) calculates the discharge capacity of an accumulator according to discharge current every 1s, and VPQ during this period of time of record and average current during this period of time.PLC, by looking into ampere-hour pressure drop and ageing rate relation table, obtains the ageing rate of current battery.This process lasts till that battery discharge finishes, and the ageing rate data that obtain in battery discharge procedure are averaged, and obtains the ageing rate data of current battery.
The 18 joint 12V battery pack that the pitch-controlled system of take is commonly used are example explanation the present invention.As shown in Figure 1, when pitch-controlled system operates by the battery feathering, contactor K1 closure, become the oar motor by the storage battery power supply feathering, and voltage current waveform during electric discharge as shown in Figure 2.
Programmable Logic Controller starts discharging time from accumulator and calculates the electric weight of emitting, and detection voltage, when reach 1s discharge time, calculate VPQ, as this 1s, in the time, emitting electric weight is 0.007Ah, voltage is reduced to 0.8V, be that VPQ is 114.3, average current 25.2A, PLC draws the ageing rate recorded in this 1s by tabling look-up.Ageing rate when same method is measured lower 1s, until discharge process finishes.In order to improve measuring accuracy, the ageing rate obtained in discharge process is averaged, obtain ageing rate 0.65.
When contactor K1 disconnects, measure accumulator voltage, as terminal voltage is 232V, the corresponding new battery capacity 5Ah of this voltage, according to relation function f (v) and the current capacity of ageing rate calculating accumulator of terminal voltage and capacity:
Q＝f(v)×Agc＝5Ah*0.65＝3.25Ah。
Claims (3)
1. a detection method of accumulator capacity of variable-pitch system of wind turbine generator is characterized in that the aging conditions of described detection method according to accumulator relation estimation accumulator between ageing rate and accumulator ampere-hour pressure drop VPQ under different discharge currents:
When wind-powered electricity generation unit feathering, the contactor of described variable-pitch system of wind turbine generator (K1) closure, battery discharging, now programmable logic controller (PLC) (PLC) detects the terminal voltage of accumulator by the variable-pitch system of wind turbine generator voltage measurement module (111) in parallel with accumulator, detects the discharge current of accumulator by described variable-pitch system of wind turbine generator current measurement module (112); Programmable logic controller (PLC) (PLC) is according to the discharge electricity amount of the discharge current calculating accumulator of accumulator, every 1s, adopts following formula to calculate the ratio of the poor and discharge electricity amount of single step of releasing piezoelectric voltage:
In above formula, VPQ is the pressure drop of accumulator ampere-hour, the pressure drop of the 1Ah battery terminal voltage that discharges, v
kfor current battery terminal voltage, v
k-1for a upper computation period battery terminal voltage, i is battery discharge current, and Δ Q is discharge electricity amount, is the integration of current i; Obtain the ageing rate of current accumulator by looking into ampere-hour pressure drop and ageing rate relation table according to the value of the accumulator ampere-hour pressure drop VPQ calculated again;
Repeat said process, until discharge process finishes;
When electric discharge finishes, described contactor (K1) disconnects, programmable logic controller (PLC) (PLC) is measured the open-circuit voltage of accumulator by described voltage measurement module (111), according to measured open-circuit voltage, and accumulator ageing rate, cell voltage and capacity relationship adopt following formula to calculate current accumulator capacity:
Q=Agc×f(v)
In above formula, Agc is ageing rate, and v is battery open-circuit voltage, and f (v) is the function of accumulator capacity to voltage.
2. detection method of accumulator capacity according to claim 1, is characterized in that accumulator ageing rate that the current ageing rate of described accumulator measures with whole discharge process is averaged to obtain.
3. detection method of accumulator capacity according to claim 1, is characterized in that described accumulator capacity is provided by accumulator manufacturer the function f (v) of voltage, or according to accumulator manufacturer offer curves, and the mode by matching obtains.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110531275A (en) * | 2019-08-11 | 2019-12-03 | 埃斯倍风电科技(青岛)有限公司 | A kind of backup battery test method of pitch-controlled system |
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| CN102778654A (en) * | 2012-07-27 | 2012-11-14 | 广东明阳风电产业集团有限公司 | Detection system and detection method for pitch-variable storage battery of wind generating set |
| CN105487014A (en) * | 2015-10-30 | 2016-04-13 | 杭州伯坦科技工程有限公司 | Method and device for predicting lithium battery capacity |
| CN108152747A (en) * | 2017-12-14 | 2018-06-12 | 北京金风科创风电设备有限公司 | Method and device for detecting capacity of storage battery |
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| CN110084445B (en) * | 2019-06-04 | 2020-11-13 | 龙源（北京）风电工程技术有限公司 | Method for calculating replacement period of storage battery for pitch control of wind turbine generator |
| CN111366866B (en) * | 2020-04-22 | 2023-09-01 | 珠海新金珠电力设备有限公司 | Monitoring device for measuring service life cycle of storage battery and calculating method |
| CN113189500B (en) * | 2021-04-28 | 2023-02-03 | 深圳市杉川锐创科技有限公司 | Battery electric quantity calculation method and device, computer equipment and storage medium |
| CN113253137B (en) * | 2021-06-07 | 2021-09-24 | 蜂巢能源科技有限公司 | Device and method for determining state of charge of battery pack |
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| JPH10104324A (en) * | 1996-09-27 | 1998-04-24 | Mitsuoka Denki Seisakusho:Kk | Device for estimating battery residual capacity |
| JP3473488B2 (en) * | 1999-04-15 | 2003-12-02 | 松下電工株式会社 | Battery remaining capacity detection device |
| DE60020821T2 (en) * | 1999-10-08 | 2006-05-11 | Yazaki Corp. | METHOD FOR CALCULATING THE CAPACITY OF A BATTERY AND DEVICE THEREFOR |
| JP4061965B2 (en) * | 2002-05-14 | 2008-03-19 | ソニー株式会社 | Battery capacity calculation method |
| JP4032934B2 (en) * | 2002-11-15 | 2008-01-16 | ソニー株式会社 | Battery capacity calculation method, battery capacity calculation device, and battery capacity calculation program |
| CN1862279B (en) * | 2005-05-11 | 2010-04-28 | 苏州润源电气技术有限公司 | Method for estimating aging rate and testing fault of battery, and apparatus for managing and monitoring battery |
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| CN110531275A (en) * | 2019-08-11 | 2019-12-03 | 埃斯倍风电科技(青岛)有限公司 | A kind of backup battery test method of pitch-controlled system |
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