CN110084445B - Method for calculating replacement period of storage battery for pitch control of wind turbine generator - Google Patents
Method for calculating replacement period of storage battery for pitch control of wind turbine generator Download PDFInfo
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- CN110084445B CN110084445B CN201910482219.2A CN201910482219A CN110084445B CN 110084445 B CN110084445 B CN 110084445B CN 201910482219 A CN201910482219 A CN 201910482219A CN 110084445 B CN110084445 B CN 110084445B
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a method for calculating the replacement period of a storage battery for the pitch variation of a wind turbine generator, which comprises the following steps: firstly, the lower limit value C of the capacity of the storage battery needing to be replaced is determinedLAnd then according to the historical operating temperature data of the unit and the capacity of the storage battery at each temperature, the rated value CNAttenuation to a lower limit value CLThe time-duration relation curve is calculated by adopting a life conversion method to ensure that the actual operation of the storage battery for one year is equivalent to a certain specific temperature TCTheoretical operating time ttheyFinally, a new replacement period t is convertednew. The new storage battery replacement period calculation method considers that the influence of the Chinese regional environment difference on the service life of the storage battery is different, the differentiated storage battery replacement period is set according to the actual use condition of the wind power plant, the existing single and conservative one-time replacement standard is avoided, the problem of environmental pollution caused by excessive waste and excessive replacement of the storage battery is effectively avoided, and the new storage battery replacement strategy has higher economic benefit and environmental protection benefit.
Description
Technical Field
The invention relates to the technical field of storage battery period measurement and calculation, in particular to a method for calculating the replacement period of a storage battery for pitch variation of a wind turbine generator.
Background
The lead-acid storage battery has the advantages of low price, simple maintenance, high reliability and the like, and is particularly suitable for large-scale application in wind power plants. The unified replacement standard of lead-acid storage batteries provided by various complete machine manufacturers and variable-pitch manufacturers at home and abroad is 2-3 years, wherein the lead-acid storage battery is most representative of the lead-acid storage battery company, a report of recommended replacement standard of batteries in wind power market is provided in 2012, and the report indicates that the regional environment of a wind power plant in China is complex, the climate difference is large, and the influence on the performance and the service life of the storage battery needs to be determined according to the specific conditions of the wind power plant.
In order to test the current situation of the available capacity of the waste lead-acid storage battery, the available capacity of the lead-acid storage battery of the same brand under the replacement of wind power plants in 7 different regions in China is tested by using a storage battery capacity tester, and the test results are shown in the following table 1.
TABLE 1 summary table of battery test data of 7 wind power plants across the country
As can be seen from the data in Table 1, the available capacity of the replaced waste storage batteries of each wind power plant is greatly different according to the unified replacement standard of 2-3, the available capacity of the replaced waste storage batteries is maintained to be 80% or more in most cases, and the available capacity of the replaced waste storage batteries is below 50% in a few cases. Therefore, the existing storage battery replacement standard with one cutting operation has the phenomenon of excessive waste, and the reasonable and standard storage battery replacement standard cannot be formulated according to the specific conditions of the wind power plant.
Therefore, the replacement period of the existing storage battery for the variable pitch of the wind turbine generator obviously still has great defects, and further improvement is urgently needed. How to create a new method for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator system, so that the method realizes the accurate strategy of replacing the storage battery, avoids the excessive waste phenomenon, and becomes the target of great improvement in the current industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a storage battery replacement period calculation method for the pitch variation of a wind turbine generator, so that the storage battery replacement is accurately implemented, excessive waste is avoided, and the problem of unreasonable replacement period of the existing storage battery is solved.
In order to solve the technical problem, the invention provides a method for calculating the replacement period of a storage battery for the pitch variation of a wind turbine generator, which comprises the following steps:
(1) obtaining the lower limit value C of the capacity of the storage battery replacement through the analysis of the existing replacement standard of the storage battery and the feathering action test of the wind turbine generatorL；
(2) The method comprises the steps of calling year-round temperature data of a wind turbine generator battery cabinet of a wind power plant, and summarizing the actual operation time t of the storage battery under each temperature datareal,T；
(3) The capacity of the accumulator is determined by a rated value C in combination with temperature dataNAttenuation to a lower limit value CLThe time duration relation curve is obtained by calculating the actual operation time duration t of the storage battery under each temperature datareal,TConverted to a specific temperature TCTheoretical operating time tthey,c；
(4) The specific temperature T is calculated within the actual operation time of the storage battery within one yearCTheoretical operating time tthey,cThe sum, sum value ∑ tthey,cI.e. at said specific temperature T of said accumulatorCThe next theoretical operation time t equivalent to one year of actual operationtheyAccording to said specific temperature TCThe decay time of the lower battery capacity and the theoretical operating time ttheyCalculating the replacement period t of the storage battery under the actual operation conditionnew。
As a modification of the present invention, the lower limit value C of the capacity for battery replacement in the step (1)LThe result was set to 50%.
In a further improvement, the step (2) includes a step of preprocessing the annual temperature data, and the preprocessing step is to round off each temperature dataReaching integral number temperature nodes T, and then summarizing and settling the actual operation time T of the storage battery of each temperature node Treal,T。
In a further improvement, in step (4), the replacement period t of the storage battery under the actual operation conditionnewEqual to at a specific temperature TCDividing the decay time of the capacity of the storage battery by the theoretical operation time t of the storage battery equivalent to one year of actual operationthey。
In a further refinement, the specific temperature TCSet to 20 ℃, said nominal value C N100% of the total amount of the catalyst, the lower limit value C L50% of the total storage capacity at 20 ℃ from the rated value CNAttenuation to said lower limit value CLThe decay time of the time was 10 years.
In a further improvement, the storage battery is a lead-acid storage battery.
After adopting such design, the invention has at least the following advantages:
the storage battery replacement period calculation method combines the historical operating temperature data of the wind turbine generators of each wind power plant and the rated value C of the capacity of the storage battery at each temperatureNAttenuation to a lower limit value CLThe time-duration relation curve is calculated by adopting a life conversion method to ensure that the actual operation of the storage battery for one year is equivalent to a certain specific temperature TCThe theoretical running time of the accumulator is converted into the service life t of the accumulatornew. The invention considers that the influence of the environmental difference of China regions on the service life of the storage battery is different, and sets a differentiated storage battery replacement period from the actual use condition of the wind power plant, thereby avoiding the existing single and conservative one-time replacement standard and effectively avoiding the problems of excessive waste of the storage battery and environmental pollution caused by excessive replacement.
The new storage battery replacement strategy has higher economic benefit and environmental protection benefit.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 shows feathering tests of different wind turbines at different battery capacities.
FIG. 2 shows the actual operating time of the battery at each temperature node.
FIG. 3 is a graph showing the results of the aging test of the secondary battery at 20 ℃.
Fig. 4 is a time-length-dependent curve of the battery capacity at each temperature when the battery capacity decays from the rated value of 100% to the lower limit value of 50%.
FIG. 5a is a graph of the ratio of the float life of the battery at 20 ℃ to the float life of the battery at each temperature node;
fig. 5b is a theoretical operating time length when the actual operating time length at each temperature node is converted to 20 ℃.
FIG. 6 is a comparison graph of replacement cycles before and after each wind farm battery is replaced by the calculation method of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to fig. 1 to 6. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The method for calculating the replacement period of the storage battery for the variable pitch of the wind turbine generator comprises the following steps:
(1) obtaining the lower limit value C of the capacity suitable for the storage battery replacement of the wind turbine generator through the analysis of the existing replacement standard of the storage battery and the feathering action test of the wind turbine generatorL。
According to article 8 of the IEEE Std 1188 + 2005 Battery test and maintenance Standard: the standard for replacing the battery is that the capacity of the battery is lower than 80% or the application capacity margin cannot be met, namely, the battery has insufficient capacity to meet the load requirement of the direct current system, and the specification 4.2.9 in the technical specification of the variable pitch control system of the NB _ T31018 and 2011 wind generating set, and the capacity of the battery pack meets the requirement of completing 3 times of emergency feathering actions under the condition of the specified load of the blade. The battery life is generally set to a time that can be used when the battery capacity decreases to 50%. And there is also prior art showing: when the storage battery is degraded to a capacity lower than 50%, more than 90% of the storage battery can be suddenly and abnormally damaged, and the phenomena of active substance falling off, plate transcrystallization short circuit, lug breakage caused by vibration, internal resistance increase, heating and water loss and the like are mainly shown.
In the embodiment, a fan with a power of 1.5MW is taken as an example, and feathering action tests are carried out on 3 common machine models (EN70-1500, UP86-1500 and UP82-1500) as shown in the attached figure 1. Therefore, the capacity of the storage battery is absorbed by the wind turbine generator by about 2% in each feathering action, and the difference is not obvious when the wind turbine generator is different in model. Then 3 times of emergency feathering actions are completed only by keeping the battery capacity above 6%.
In summary, the lower limit value C of the capacity for replacing the storage battery in this embodimentLThe capacity margin of the feathering action of the unit can be met and the use stability of the storage battery can be kept to a certain extent by setting the capacity margin to be 50 percent.
(2) The method comprises the steps of taking 2016 year-round unit battery cabinet temperature data of Mongolian and forest and grass wind power plants, rounding each temperature data to integral temperature nodes T, and simultaneously summarizing and settling the running time T of storage batteries of each temperature node Treal,TAs shown in fig. 2.
(3) The capacity of the storage battery under each temperature node T is combined by a rated value CNAttenuation to a lower limit value CLThe time duration relation curve is obtained by calculating the actual operation time duration T of the storage battery under each temperature node Treal,TConverted to a specific temperature TCTheoretical operating time tthey,c。
FIG. 3 is a graph showing the aging test results of the storage battery at 20 ℃ and the aging test duration of the storage battery at which the capacity of the storage battery decays from the rated value of 100% to the lower limit of 50% is 10 years, and a time duration relation curve of the storage battery at each temperature node T at which the capacity of the storage battery decays from the rated value of 100% to the lower limit of 50% is obtained through a large number of aging tests of a storage battery manufacturer, as shown in FIG. 4.
(4) Then the specific temperature T is calculated within the actual operation time of the storage battery within one yearCTheoretical operating time tthey,cThe sum, sum value ∑ tthey,cI.e. the battery is at the specific temperature TCThe next theoretical operating time t corresponding to the actual operation for 1 yeartheyAccording to the specific temperature TCDecay time of lower battery capacity and calculated theoretical operating time ttheyConverting the replacement period t of the accumulator under the actual operation conditionnewThus obtaining the new service life of the storage battery.
In this embodiment, the specific temperature T is setCAt 20 deg.C, the actual operating time T of the storage battery at each temperature node T is calculated according to the reduced time ratio shown in FIG. 5a, i.e. the ratio of the float charge life of the battery at 20 deg.C to the float charge life of the battery at each temperature nodereal,TConverted into the theoretical running time t at the normal temperature of 20 DEG Cthey,cAs shown in fig. 5 b. For example, at 41 ℃, the float charge life of the storage battery is 4.17 times of that of the storage battery at 20 ℃, and at the moment, the actual operation time of the storage battery is 106.33 hours, which is equivalent to 443.4 hours of theoretical operation at 20 ℃.
Then, the calculated theoretical operating time length sum Σ t at 20 ℃ is doubledthey,cThe sum of the years is 1.85, and the actual operation of the storage battery for 1 year is equivalent to the operation of the storage battery for 1.85 years at 20 ℃.
Finally, according to the decay time of the battery capacity at 20 ℃ for 10 years and the calculated theoretical operation time for 1.85 years, the usable service life time t of the storage battery under the actual operation condition is convertednewThe new replacement period of the lead-acid storage battery in the wind power plant of Mongolian and forest grassland is 5.4 years.
By adopting the storage battery replacement period calculation method, the new replacement periods of the storage batteries of other wind power plants are calculated, and the result is shown in figure 6. It can be seen from the figure that the original replacement cycle is not suitable for all wind power plants in China, and for perennial low-temperature areas such as Mongolian and forest, Shandong coast, Liaoning Xiguan and Heilongjiang grassland, the service life of the storage battery is obviously longer, so that a new replacement cycle needs to be formulated according to specific analysis of specific conditions, and excessive waste and excessive replacement of the storage battery are avoided.
The invention considers that the influence of the Chinese regional environment difference on the service life of the storage battery is different, sets a new replacement period from the actual use condition of each wind power plant storage battery, avoids the original single and conservative one-time replacement standard, and effectively avoids the environmental pollution problem caused by excessive waste and excessive replacement of the storage battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (6)
1. A method for calculating the replacement period of a storage battery for the pitch variation of a wind turbine generator is characterized by comprising the following steps:
(1) obtaining the lower limit value C of the capacity of the storage battery replacement through the analysis of the existing replacement standard of the storage battery and the feathering action test of the wind turbine generatorL；
(2) The method comprises the steps of calling year-round temperature data of a wind turbine generator battery cabinet of a wind power plant, and summarizing the actual operation time t of the storage battery under each temperature datareal,T；
(3) The capacity of the accumulator is determined by a rated value C in combination with temperature dataNAttenuation to a lower limit value CLThe time duration relation curve is obtained by calculating the actual operation time duration t of the storage battery under each temperature datareal,TConverted to a specific temperature TCTheoretical operating time tthey,c；
(4) The specific temperature T is calculated within the actual operation time of the storage battery within one yearCTheoretical operating time tthey,cThe sum, sum value ∑ tthey,cI.e. at said specific temperature T of said accumulatorCThe next theoretical operation time t equivalent to one year of actual operationtheyAccording to said specific temperature TCThe decay time of the lower battery capacity and the theoretical operating time ttheyCalculating the replacement period t of the storage battery under the actual operation conditionnew。
2. The method for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator set according to claim 1, wherein in the step (1), the method is used for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator setLower limit value C for battery replacementLThe result was set to 50%.
3. The method according to claim 1, wherein the step (2) includes a step of preprocessing annual temperature data, the preprocessing step is to round each temperature data to an integral temperature node T, and then to summarize the actual operation time T of the storage battery at each temperature node Treal,T。
4. The method for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator set according to claim 1, wherein the replacement period t of the storage battery in the actual operation condition in the step (4)newEqual to at a specific temperature TCDividing the decay time of the capacity of the storage battery by the theoretical operation time t of the storage battery equivalent to one year of actual operationthey。
5. The method for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator set according to claim 4, wherein the specific temperature TCSet to 20 ℃, said nominal value CN100% of the total amount of the catalyst, the lower limit value CL50% of the total storage capacity at 20 ℃ from the rated value CNAttenuation to a lower limit value CLThe decay time of the time was 10 years.
6. The method for calculating the replacement period of the storage battery for the pitch control of the wind turbine generator set according to any one of claims 1 to 5, wherein the storage battery is a lead-acid storage battery.
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