CN109212321B - Method and device for detecting capacitance value of super capacitor - Google Patents
Method and device for detecting capacitance value of super capacitor Download PDFInfo
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- CN109212321B CN109212321B CN201811005462.7A CN201811005462A CN109212321B CN 109212321 B CN109212321 B CN 109212321B CN 201811005462 A CN201811005462 A CN 201811005462A CN 109212321 B CN109212321 B CN 109212321B
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Abstract
The invention discloses a method and a device for detecting capacitance value of a super capacitor. The capacity value detection method comprises the following steps: detecting whether the wind generating set is restarted after power failure; if the wind generating set is restarted after power failure, detecting whether the voltage of the super capacitor and the working state of the charger both meet a preset super capacitor capacitance value detection condition; and if the voltage of the super capacitor and the working state of the charger both meet the detection condition of the capacitance value of the super capacitor, calculating to obtain the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor. By adopting the technical scheme in the embodiment of the invention, the automatic online detection of the capacitance value of the super capacitor can be realized.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method and a device for detecting capacitance value of a super capacitor.
Background
The super capacitor is an important component of a pitch system of the wind generating set. When the fan breaks down, the variable pitch system can execute an emergency pitch-collecting function, pneumatic braking is realized, and the safety of the unit is guaranteed. When the power grid is in failure, the pitch control system needs to start a super capacitor (namely a backup power supply) to execute the pitch control operation. Because the capacitance value of the super capacitor is gradually reduced or even fails in the use process of the super capacitor, and the safe operation of the wind generating set is influenced, the capacitance value of the super capacitor in the actual operation of the variable pitch system needs to be detected.
The capacitance value detection method of the super capacitor in the prior art comprises the following steps: and cutting off the output of the charger, manually discharging the super capacitor, switching on the charger to charge the super capacitor when the voltage of the super capacitor is reduced to a specified value, and detecting the capacitance value of the super capacitor in the charging process.
However, since the operation of cutting off the output of the charger is usually performed after the wind turbine generator system is shut down, only the capacitance value of the super capacitor can be detected off-line, and the capacitance value of the super capacitor cannot be detected on-line.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting capacitance values of a super capacitor, which can realize automatic online detection of the capacitance values of the super capacitor.
In a first aspect, an embodiment of the present invention provides a method for detecting a capacitance value of a super capacitor, where the method includes:
detecting whether the wind generating set is restarted after power failure;
if the wind generating set restarts after the power failure, detecting whether the voltage of the super capacitor and the working state of the charger both meet the preset detection condition of the capacitance value of the super capacitor, wherein the detection condition of the capacitance value of the super capacitor comprises the following steps: the voltage of the super capacitor is smaller than a preset voltage detection threshold value, and the charger is in a normal charging state, wherein the voltage detection threshold value is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period;
and if the voltage of the super capacitor and the working state of the charger both meet the detection condition of the capacitance value of the super capacitor, calculating to obtain the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor.
In one possible implementation of the first aspect, the method further comprises: and if the current of the charger is not 0, determining that the charger is in a normal charging state.
In a possible implementation manner of the first aspect, calculating a capacitance value of the super capacitor according to a current of the charger and a voltage of the super capacitor includes: and calculating to obtain the capacitance value of the super capacitor according to the current of the charger in a preset capacitance value detection period and the voltage of the super capacitor in the capacitance value detection period.
In a possible implementation manner of the first aspect, calculating a capacitance value of the super capacitor according to a current of the charger in a preset capacitance value detection period and a voltage of the super capacitor in the capacitance value detection period includes: calculating the current average value of the charger in a capacity value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the duration of the capacitance value detection period; or acquiring the current value of the charger at the middle moment of the capacity value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and calculating to obtain the capacitance value of the super capacitor according to the current value, the voltage difference and the duration of the capacitance value detection period at the intermediate moment.
In one possible implementation of the first aspect, the duration of the capacity detection period is greater than or equal to 500 ms.
In one possible embodiment of the first aspect, detecting whether the wind turbine generator set restarts after power failure includes: setting a power-on operation mark in a main controller of the wind generating set; and if the rising edge of the signal of the power-on operation mark is detected, determining that the wind generating set is restarted after power failure.
In a second aspect, an embodiment of the present invention provides a device for detecting capacitance of a super capacitor, where the device includes:
the first detection module is used for detecting whether the wind generating set is restarted after power failure;
the second detection module is used for detecting whether the voltage of the super capacitor and the working state of the charger meet the preset super capacitor capacity value detection condition if the wind generating set is restarted after power failure, and the super capacitor capacity value detection condition comprises the following steps: the voltage of the super capacitor is smaller than a preset voltage detection threshold value, and the charger is in a normal charging state, wherein the voltage detection threshold value is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period;
and the calculation module is used for calculating the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor if the voltage of the super capacitor and the working state of the charger both meet the capacitance value detection condition of the super capacitor.
In a possible implementation manner of the second aspect, the calculating module is specifically configured to calculate the capacitance value of the super capacitor according to a current of the charger in a preset capacitance value detection period and a voltage of the super capacitor in the capacitance value detection period.
In a possible implementation of the second aspect, the calculation module comprises a first calculation unit or a second calculation unit; the first calculating unit is used for calculating the current average value of the charger in the capacity value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the duration of the capacitance value detection period; the second calculation unit is used for acquiring the current value of the charger at the middle moment of the capacitance value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and calculating to obtain the capacitance value of the super capacitor according to the current value, the voltage difference and the duration of the capacitance value detection period at the intermediate moment.
In a possible implementation manner of the second aspect, the first detection module is specifically configured to set a power-on operation flag in a main controller of the wind turbine generator system; and if the rising edge of the signal of the power-on operation mark is detected, determining that the wind generating set is restarted after power failure.
In a possible embodiment of the second aspect, the device is provided in a pitch controller or a main controller of the wind park.
As described above, to implement online detection of the capacitance value of the super capacitor, in the embodiment of the present invention, it is first detected whether the wind turbine generator system is restarted after power failure, and when the wind turbine generator system is determined to be restarted after power failure, it is detected whether both the voltage of the super capacitor and the working state of the charger satisfy the preset detection condition of the capacitance value of the super capacitor, and when both the voltage of the super capacitor and the working state of the charger satisfy the detection condition of the capacitance value of the super capacitor, the capacitance value of the super capacitor is calculated according to the current of the charger and the voltage of the super capacitor.
According to the embodiment of the invention, the trigger condition of the capacitance value detection of the super capacitor is determined as restarting the wind generating set after power failure, for example, the capacitance value detection of the super capacitor can be carried out by utilizing the maintenance characteristic of the semi-annual inspection of the wind generating set and the self-discharge characteristic of the super capacitor, so that the output of a charger does not need to be manually cut off, the super capacitor does not need to be manually discharged, and the automatic online detection of the capacitance value of the super capacitor can be realized on the premise of no manual intervention and special waiting.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a schematic power supply topology diagram of a pitch system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a capacitance value detection method of a super capacitor according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for detecting capacitance of a super capacitor according to another embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a charging curve of a super capacitor according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a capacitance value detection apparatus of a super capacitor according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a capacitance value detection device of a super capacitor according to another embodiment of the present invention.
Description of reference numerals:
101-a charger; 102-a super capacitor; 103-frequency converter; 104-a variable pitch motor;
105-pitch controller.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
A variable pitch system of the wind generating set is used for adjusting the pitch angle of the blades. For example, if the wind speed exceeds the rated wind speed during normal operation of the wind generating set, the pitch control system executes the pitch control operation to keep the rotating speed of the wind generating set constant, so that the wind generating set can output constant power; if the wind generating set breaks down, the pitch control system can execute feathering operation, the pitch angle of the blades is adjusted to 0 degree from the current value, and safety of the wind generating set is guaranteed through pneumatic braking.
The pitch system is powered by the power grid, and when the power grid is powered down or a low voltage passes through, the pitch system can be powered by a backup power supply, such as a super capacitor, to perform feathering operation. Supercapacitors, also known as electrochemical capacitors, are an electrochemical element between a conventional capacitor and a battery. The super capacitor mainly stores electric energy by electric double layers and redox capacitor charges, but the super capacitor does not generate chemical reaction in the process of energy storage, and the energy storage process is reversible, so that the super capacitor in the wind generating set can be repeatedly charged and discharged for tens of thousands of times.
Fig. 1 is a power supply topology schematic diagram of a pitch system according to an embodiment of the present invention. As shown in fig. 1, the pitch system comprises a charger 101, a supercapacitor 102, a frequency converter 103, a pitch motor 104 and a pitch controller 105.
The input end of the charger 101 is connected with a power grid, the output end "+" of the charger 101 is respectively connected with the "+" end of the super capacitor 102 and the "+" end of the frequency converter 103, and the output end "-" of the charger 101 is respectively connected with the "-" end of the super capacitor 102 and the "-" end of the frequency converter 103, and is used for charging the super capacitor 102 and supplying power to the frequency converter 103. The control end of the charger 101 is connected to the pitch controller 105, the pitch controller 105 and the charger 101 may perform data interaction through a CanOpen protocol, for example, the pitch controller 105 may output a switch control instruction to the charger 101, and the charger 101 is turned on or off according to the switch control instruction. In addition, pitch controller 105 may also interact with a wind turbine main controller.
As shown in fig. 1, the output of the super capacitor 102 is also connected to a frequency converter 103 for supplying power to the frequency converter. The output end of the frequency converter 103 is connected with a pitch motor 104 and is used for driving the pitch motor 104 to operate.
When the power supply of the power grid is normal, the working principle of the charger 101 is that the voltage value of the super capacitor 102 is monitored in real time and compared with the charging threshold voltage, and when the voltage of the super capacitor 102 is reduced due to the energy consumption of the pitch motor 104 and is lower than the charging threshold voltage, the charger 101 starts to charge the super capacitor 102. In one example, the charger 101 may employ a PID feedback regulator to control the charging process of the super capacitor 102 to increase the charging rate and ensure safety during the charging process.
When the power supply of the power grid is abnormal, the super capacitor 102 continuously supplies power to the frequency converter 103 to drive the variable pitch motor 104 to operate. Since the capacitance value of the super capacitor 102 is gradually reduced or even fails during the use process, which affects the safe operation of the wind turbine generator system, it is necessary to detect the capacitance value of the super capacitor in the actual operation of the pitch system.
In order to ensure the safe operation of the wind generating set, the wind generating set is detected regularly, for example, monthly inspection is performed within one year after the debugging of the wind generating set is finished, and annual inspection or semi-annual inspection is performed every year after the first year. The main work of the regular detection of the wind generating set comprises the following steps: the method is reasonable to maintain an automobile, and the wind generating set needs to be powered off actively during detection. In addition, the wind power plant can have irregular accidental power failure of the power grid.
Referring to fig. 1, after power failure, the charger 101 can no longer charge the super capacitor 102, and the super capacitor 102 will self-discharge. The self-discharge phenomenon refers to the loss of battery capacity caused by internal spontaneous reaction when the storage battery and the super capacitor are not connected with an external circuit.
The inventor of the application finds that the time required by the self-discharge of the voltage of the super capacitor 102 to the minimum value is generally less than 20 hours, the time for the regular detection of the wind generating set or the power failure of the power grid is usually 5-6 hours or even longer, the voltage drop value of the super capacitor 102 meets the capacitance value detection requirement in the subsequent charging process in the period of the regular detection of the wind generating set or the power failure of the power grid, and the capacitance value detection cannot be carried out due to the fact that the time for charging to the total voltage is too short.
Based on the above, the embodiment of the invention provides a method and a device for detecting the capacitance value of a super capacitor, which can realize automatic online detection of the capacitance value of the super capacitor by combining with the regular inspection of a wind generating set or the power failure condition of a power grid.
Fig. 2 is a schematic flow chart of a capacitance value detection method of a super capacitor according to an embodiment of the present invention. As shown in fig. 2, the method for detecting the capacitance value includes steps 201 to 203.
In step 201, it is detected whether the wind turbine generator set is restarted after power failure.
The wind generating set is subjected to more power failure working conditions, wherein the wind generating set is periodically checked or the power grid is powered down, and the frequency of the power grid is higher in the working conditions causing the power failure of the wind generating set. Generally, under the working condition of regular inspection or power grid power failure of a wind generating set, a fan runs in a control cabinet where a charger is located, so that the voltage of a super capacitor can be reduced quickly.
In an alternative embodiment, a power-on operation flag may be set in the main controller of the wind turbine generator system, and if a rising edge of a signal of the power-on operation flag is detected, it is determined that the wind turbine generator system is restarted after power failure.
In step 202, if the wind turbine generator system is restarted after power failure, it is detected whether both the voltage of the super capacitor and the working state of the charger meet a preset detection condition for the capacitance value of the super capacitor.
The capacitance value detection condition of the super capacitor is as follows: the voltage of the super capacitor is smaller than a preset voltage detection threshold value, and the charger is in a normal charging state. The voltage detection threshold is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period. Taking the capacitance detection period as 2s as an example, the voltage detection threshold is the difference between the total voltage of the super capacitor and the voltage rise value of the super capacitor after being charged for 2 s. Generally, the value of the voltage detection threshold is about 50% to 70% of the total voltage of the super capacitor.
In an example, whether the charger is in the normal charging state may be determined by a current of the charger, for example, if an operating current of the charger is 0, it may be determined that the charger is in the normal charging state.
In step 203, if the voltage of the super capacitor and the working state of the charger both satisfy the detection condition of the capacitance value of the super capacitor, the capacitance value of the super capacitor is calculated according to the current of the charger and the voltage of the super capacitor.
As described above, to implement online detection of the capacitance value of the super capacitor, in the embodiment of the present invention, it is first detected whether the wind turbine generator system is restarted after power failure, and when the wind turbine generator system is determined to be restarted after power failure, it is detected whether both the voltage of the super capacitor and the working state of the charger satisfy the preset detection condition of the capacitance value of the super capacitor, and when both the voltage of the super capacitor and the working state of the charger satisfy the detection condition of the capacitance value of the super capacitor, the capacitance value of the super capacitor is calculated according to the current of the charger and the voltage of the super capacitor.
According to the embodiment of the invention, the trigger condition of the capacitance value detection of the super capacitor is determined as restarting the wind generating set after power failure, for example, the capacitance value detection of the super capacitor can be carried out by utilizing the maintenance characteristic of the semi-annual inspection of the wind generating set and the self-discharge characteristic of the super capacitor, so that the output of a charger does not need to be manually cut off, the super capacitor does not need to be manually discharged, and the automatic online detection of the capacitance value of the super capacitor can be realized on the premise of no manual intervention and special waiting.
In addition, the supercapacitor capacity value detection method in the embodiment of the invention does not need to manually cut off the charger and manually discharge the supercapacitor, so that the labor cost and the time cost can be reduced, and the shutdown operation of the wind generating set required by cutting off the charger or the potential safety hazard of the wind generating set caused by cutting off the charger when the wind generating set normally operates can be avoided.
In addition, the automatic online detection in the embodiment of the present invention is different from the general timing detection and manual detection. Once time is reached during timing detection, all wind generating sets need to be disconnected from the network for capacity value detection, so that the generated energy is influenced, and power grid fluctuation is caused by batch disconnection of the wind generating sets; during manual detection, for safety, the three blades are generally used for cutting off the chargers one by one to perform capacity value detection, so that the whole detection period is long, at least 15 minutes are needed, and the loss of the generated energy is not small for the whole wind power plant.
Fig. 3 is a schematic flow chart of a capacitance value detection method of a super capacitor according to another embodiment of the present invention. Fig. 3 differs from fig. 2 in that step 203 in fig. 2 can be subdivided into step 2031 in fig. 3.
In step 2031, a capacitance value of the super capacitor is calculated according to a current of the charger in a preset capacitance value detection period and a voltage of the super capacitor in the capacitance value detection period.
At present, the equation for calculating the capacitance value C of a super capacitor based on the ampere-hour method is as follows:
C＝I×t/△U (1)
where t is a charging time, I is a charging current, and Δ U is a voltage variation value (also understood as a voltage increase value) of the super capacitor in the time period t.
As can be seen from equation (1), during the charging process, the voltage value of the super capacitor gradually increases, and the current value I has a certain range of fluctuation, i.e., the current value may be different at each moment. To obtain an accurate current value, integration operation is usually performed on the charging current, and the shorter the acquisition time (for example, acquiring once in 20 ms), the more the calculated I is close to a straight line, and the more accurate it is. However, the inventors of the present application have found that the shorter the acquisition cycle is, the smaller the voltage change amount Δ U in the denominator is, and that the detection error is large after being affected by the fluctuation.
For example, if the detected voltage variation Δ U is 0.4 and the ripple width is 0.1, the detection accuracy of the capacitance value of the super capacitor is only 0.4/0.5 to 80%, and the accuracy is very low. On the other hand, if the detected voltage change Δ U is 4.0 and the ripple width is still 0.1, the detection accuracy of the capacitance value of the super capacitor becomes 4.0/4.1 to 98%, which improves the accuracy and is less affected by the loop ripple.
Therefore, the sampling period, namely the capacitance value detection period, can be considered to be increased, and the capacitance value detection of the super capacitor is started until the delta U is a larger value, so that the influence of voltage fluctuation in a charging circuit caused by the shortening of the sampling period is avoided, and the capacitance value detection precision of the super capacitor is improved.
The embodiment of the invention provides two super capacitor capacitance value detection modes to execute capacitance value detection on the basis of increasing the duration of a capacitance value detection period.
As a first super capacitor capacitance value detection mode, a current average value of the charger in a capacitance value detection period can be calculated; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and then calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the duration of the capacitance value detection period based on the formula (1).
As a second super capacitor capacitance value detection mode, the current value of the charger at the middle moment of the capacitance value detection period can be obtained; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and then calculating to obtain the capacitance value of the super capacitor according to the current value, the voltage difference and the duration of the capacitance value detection period at the intermediate moment based on the formula (1).
In order to ensure the calculation accuracy of the voltage difference value in the capacitance value detection process of the super capacitor, the duration of the capacitance value detection period is greater than or equal to 500ms, for example, 2s or 4 s. Next, a principle of calculating the capacitance value of the super capacitor based on the current value at the intermediate time in the second super capacitor capacitance value detection method will be described.
Fig. 4 is a schematic diagram of a charging curve of a super capacitor according to an embodiment of the present invention. Wherein, the abscissa is the charging time, and the ordinate is the voltage value at both ends of the super capacitor.
In fig. 4, a plurality of sampling instants are shown, including t1, t2, t3, …, tn, and since each small segment in the curve can be approximately viewed as a straight line, according to the characteristics of the straight line equation, there are:
wherein, Ut1，Ut2，Ut3，…，UtnThe voltage values corresponding to the time points t1, t2, t3, … and tn respectively,
is located at [ t1, tn]The voltage value at the intermediate time. That is, the median voltage value can be used
To characterize [ t1, tn ]]The voltage value of the inner super capacitor.
According to the formula (1), since the charging current I is approximately constant, the current value at the intermediate time is approximately equal to the current value in the time from t1 to tn, and therefore, the capacitance value of the super capacitor is calculated based on the current value at the intermediate time, and the current detection accuracy can be improved.
According to the formula (1), although the voltage value of the super capacitor continuously rises in the charging process, the current value output by the charger continuously decreases along with the continuous rise of the voltage value of the super capacitor, and the voltage increment in the super capacitor gradually decreases, namely the numerator and denominator in the formula (1) simultaneously decrease, so that the calculation result is accurate.
In addition, because the processing objects of the capacitance value detection method of the super capacitor in the embodiment of the invention are voltage data and current data in a longer period, the acquisition precision of analog quantity, the real-time property of current and the timing precision of a timer are not required, and an additional constant current control device is not required.
Fig. 5 is a schematic structural diagram of a capacitance value detection device of a super capacitor according to an embodiment of the present invention. As shown in fig. 5, the capacitance value detecting apparatus includes a first detecting module 501, a second detecting module 502, and a calculating module 503.
The first detection module 501 is used for detecting whether the wind generating set is restarted after power failure. Specifically, the first detection module 501 is configured to set a power-on operation flag in a main controller of the wind turbine generator system; and if the rising edge of the signal of the power-on operation mark is detected, determining that the wind generating set is restarted after power failure.
The second detection module 502 is configured to detect whether the voltage of the super capacitor and the working state of the charger both satisfy a preset super capacitor capacitance value detection condition if the wind turbine generator system is restarted after power failure, where the super capacitor capacitance value detection condition includes: the voltage of the super capacitor is smaller than a preset voltage detection threshold value, and the charger is in a normal charging state, wherein the voltage detection threshold value is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period. .
The calculating module 503 is configured to calculate to obtain the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor if both the voltage of the super capacitor and the working state of the charger meet the detection condition of the capacitance value of the super capacitor. Specifically, the calculating module 503 is configured to calculate a capacitance value of the super capacitor according to a current of the charger in a preset capacitance value detection period and a voltage of the super capacitor in the capacitance value detection period.
Fig. 6 is a schematic structural diagram of a capacitance value detection device of a super capacitor according to another embodiment of the present invention. Fig. 6 differs from fig. 5 in that the calculation module 503 in fig. 5 can be refined into the first calculation unit 5031 or the second calculation unit 5032 in fig. 6.
The first calculating unit 5031 is configured to calculate a current average value of the charger in the capacity detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the duration of the capacitance value detection period.
The second calculating unit 5032 is configured to obtain a current value of the charger at a middle time of the capacitance value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and calculating to obtain the capacitance value of the super capacitor according to the current value, the voltage difference and the duration of the capacitance value detection period at the intermediate moment.
The embodiment of the invention also provides a wind generating set which comprises the capacitance value detection device of the super capacitor.
The capacitance value detection device of the super capacitor can be arranged in a pitch controller or a main controller of the wind generating set, and is not limited herein.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A capacitance value detection method of a super capacitor is characterized by comprising the following steps:
detecting whether the wind generating set is restarted after power failure;
if the wind generating set is restarted after power failure, detecting whether the voltage of the super capacitor and the working state of the charger both meet a preset super capacitor capacitance value detection condition; the capacitance value detection condition of the super capacitor comprises the following steps: the voltage of the super capacitor is smaller than a preset voltage detection threshold, and the charger is in a normal charging state, wherein the voltage detection threshold is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period;
if the voltage of the super capacitor and the working state of the charger both meet the detection condition of the capacitance value of the super capacitor, calculating to obtain the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor;
the calculating the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor comprises the following steps:
calculating to obtain the capacitance value of the super capacitor according to the current of the charger in a preset capacitance value detection period and the voltage of the super capacitor in the capacitance value detection period;
the calculating the capacitance value of the super capacitor according to the current of the charger in a preset capacitance value detection period and the voltage of the super capacitor in the capacitance value detection period includes:
calculating the current average value of the charger in the capacity value detection period;
calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period;
calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the duration of the capacitance value detection period;
alternatively, the first and second electrodes may be,
acquiring a current value of the charger at the middle moment of the capacitance value detection period;
calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period;
and calculating to obtain the capacitance value of the super capacitor according to the current value at the intermediate moment, the voltage difference and the duration of the capacitance value detection period.
2. The method of claim 1, further comprising:
and if the current of the charger is not 0, determining that the charger is in a normal charging state.
3. The method according to any one of claims 1 and 2, wherein the detecting whether the wind turbine generator set is restarted after power failure comprises:
setting a power-on operation mark in a main controller of the wind generating set;
and if the rising edge of the signal of the power-on operation mark is detected, determining that the wind generating set is restarted after power failure.
4. A super capacitor capacitance value detection device is characterized by comprising:
the first detection module is used for detecting whether the wind generating set is restarted after power failure;
the second detection module is used for detecting whether the voltage of the super capacitor and the working state of the charger both meet the preset detection condition of the capacitance value of the super capacitor if the wind generating set is restarted after power failure; the capacitance value detection condition of the super capacitor comprises the following steps: the voltage of the super capacitor is smaller than a preset voltage detection threshold, and the charger is in a normal charging state, wherein the voltage detection threshold is a difference value between the total voltage of the super capacitor and a voltage rising value of the super capacitor caused by charging in a preset capacitance value detection period;
the calculation module is used for calculating the capacitance value of the super capacitor according to the current of the charger and the voltage of the super capacitor if the voltage of the super capacitor and the working state of the charger both meet the capacitance value detection condition of the super capacitor;
the calculation module is specifically configured to calculate a capacitance value of the super capacitor according to a current of the charger in a preset capacitance value detection period and a voltage of the super capacitor in the capacitance value detection period;
the computing module comprises a first computing unit or a second computing unit;
the first calculating unit is used for calculating the current average value of the charger in the capacity value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; calculating to obtain the capacitance value of the super capacitor according to the current mean value, the voltage difference and the capacitance value detection period duration;
the second calculating unit is used for acquiring the current value of the charger at the middle moment of the capacitance value detection period; calculating the voltage difference of the super capacitor between the starting time and the ending time of the capacitance value detection period; and calculating to obtain the capacitance value of the super capacitor according to the current value at the intermediate moment, the voltage difference and the capacitance value detection period duration.
5. The device according to claim 4, wherein the first detection module is specifically configured to set a power-on operation flag in a main controller of the wind turbine generator system; and if the rising edge of the signal of the power-on operation mark is detected, determining that the wind generating set is restarted after power failure.
6. An arrangement according to any of claims 4 and 5, characterized in that the arrangement is provided in a pitch controller or a main controller of a wind power plant.
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| CN112526246A (en) * | 2019-09-19 | 2021-03-19 | 新疆金风科技股份有限公司 | Method and device for detecting working condition of super capacitor of wind generating set |
| CN110957774B (en) * | 2019-11-12 | 2021-10-01 | 国电南瑞科技股份有限公司 | Super capacitor state online monitoring method and device and charging system |
| CN110988489B (en) * | 2019-12-16 | 2021-09-28 | 三一重能股份有限公司 | Capacitance detection period determination method and device, electronic equipment and wind driven generator |
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| CN113864133B (en) * | 2020-06-30 | 2022-11-15 | 北京金风科创风电设备有限公司 | Capacitance characteristic detection method and device of super capacitor and variable pitch system |
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