Detection device for super capacitor of wind driven generator

Abstract

The utility model discloses a detection device for a super capacitor of a wind driven generator, and the device comprises a main control module which is used for transmitting a charging instruction to a power module, is also used for transmitting a discharging instruction to an electronic load module, and is also used for transmitting a sampling instruction to a high-precision sampling module; the power supply module is used for charging the super capacitor according to the charging instruction; the electronic load module is used for discharging the super capacitor according to the discharging instruction; the high-precision sampling module is used for sampling a current signal and a voltage signal of the super capacitor according to the sampling instruction and sending the current signal and the voltage signal to the main control module; and the main control module is also used for generating a test result of the super capacitor according to the current signal and the voltage signal. It can be seen that the super capacitor in the back-up power supply of the wind driven generator can be tested, and the probability that the variable pitch system of the wind driven generator works successfully in an emergency is ensured.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and more specifically, to a detection device for a supercapacitor of a wind turbine generator. Background Art

[0002] Wind turbines use wind power to obtain energy for power generation, but the wind power faced by wind turbines is not always within the design tolerance range. When a wind turbine faces wind power that exceeds its design tolerance range, it often chooses variable pitch according to the design response method. Variable pitch is a way to reduce the wind damage to the wind turbine by changing the angle of the wind blades to reduce the force area of ​​the wind blades.

[0003] The speed of the wind turbine is determined by the angle of the blades adjusted by the pitch control system. The pitch control system also has the function of emergency feathering of the blades to ensure safe braking of the wind turbine in an emergency and prevent the blades from losing control. The pitch control system has two power supplies, the grid power supply and the backup power supply, to prevent the turbine from failing to work and being safely braked when the grid fails. Therefore, the stability of the backup power supply will ensure the safe operation of the wind turbine.

[0004] Supercapacitors are widely used in backup power supplies due to their high power density, fast charge and discharge speed, and many charge and discharge cycles. They are connected in series to match the voltage level of the backup power supply. When the capacitance value of a supercapacitor cell changes due to changes in electrical parameters, open circuits, or breakdown, the voltage on the supercapacitor cell will exceed the rated value or even cause damage, thus affecting the normal power supply of the backup power supply. However, the existing supercapacitor test system is large in size and requires the cooperation of the host computer software. At the same time, it cannot match the rated voltage used by the supercapacitor in the backup power supply, so it is impossible to test the supercapacitor in the backup power supply.

[0005] Therefore, there is an urgent need for a wind turbine supercapacitor detection device to detect the supercapacitor in the backup power supply to ensure the probability of successful operation of the wind turbine pitch control system in an emergency. Utility Model Content

[0006] The embodiment of the present application provides a detection device for a supercapacitor of a wind turbine generator, which can detect the supercapacitor in the wind turbine generator.

[0007] In view of this, an embodiment of the present application provides a detection device for a supercapacitor of a wind turbine generator, the device comprising:

[0008] A main control module, a high-precision sampling module, an electronic load module and a power supply module, wherein the main control module is connected to the high-precision sampling module, the electronic load module and the power supply module respectively;

[0009] The main control module is used to send a charging instruction to the power supply module, a discharging instruction to the electronic load module, and a sampling instruction to the high-precision sampling module;

[0010] The power module is used to charge the supercapacitor according to the charging instruction;

[0011] The electronic load module is used to discharge the supercapacitor according to the discharge instruction;

[0012] The high-precision sampling module is used to sample the current signal and the voltage signal of the supercapacitor according to the sampling instruction, and send the current signal and the voltage signal to the main control module;

[0013] The main control module is further used to generate a test result of the supercapacitor according to the current signal and the voltage signal.

[0014] Optionally, the power supply module includes a current conversion unit and a constant current power supply unit;

[0015] The current conversion unit is used to convert alternating current into direct current, and output the direct current to the constant current power supply unit;

[0016] The constant current power supply unit is used to perform constant current charging on the super capacitor according to the charging instruction.

[0017] Optionally, the electronic load module includes a main control chip, a MOS tube constant current circuit and a MOS tube control circuit;

[0018] The main control chip is connected to the MOS tube constant current circuit and the MOS tube control circuit respectively.

[0019] Optionally, the high-precision sampling module includes a 24-bit high-precision analog-to-digital converter chip.

[0020] Optionally, the device further comprises a liquid crystal display module, and the liquid crystal display module is connected to the main control module;

[0021] The main control module is also used to send the test result of the super capacitor to the liquid crystal display module;

[0022] The liquid crystal display module is used to display the test result.

[0023] Optionally, the device further comprises a key module, and the key module is connected to the main control module;

[0024] The key module is used to receive the test control instruction input by the user and send the test control instruction to the main control module;

[0025] The main control module is also used to test the supercapacitor according to the test control instruction.

[0026] Optionally, the device further comprises a storage module, and the storage module is connected to the main control module;

[0027] The main control module is also used to send the test result of the supercapacitor to the storage module;

[0028] The storage module is used to store the test result.

[0029] Optionally, the device further comprises a printing module, and the printing module is connected to the main control module;

[0030] The main control module is also used to send the test result of the supercapacitor to the printing module;

[0031] The printing module is used to print the test result.

[0032] Optionally, the power module further includes a protection circuit, and the protection circuit is connected to the constant current power supply unit;

[0033] The protection circuit is used to prevent current backflow.

[0034] An embodiment of the present application provides a detection device for a supercapacitor of a wind turbine generator, comprising: a main control module, a high-precision sampling module, an electronic load module and a power supply module, wherein the main control module is connected to the high-precision sampling module, the electronic load module and the power supply module respectively; the main control module is used to send a charging instruction to the power supply module, and is also used to send a discharging instruction to the electronic load module, and is also used to send a sampling instruction to the high-precision sampling module; the power supply module is used to charge the supercapacitor according to the charging instruction; the electronic load module is used to discharge the supercapacitor according to the discharging instruction; the high-precision sampling module is used to sample the current signal and the voltage signal of the supercapacitor according to the sampling instruction, and send the current signal and the voltage signal to the main control module; the main control module is also used to generate a test result of the supercapacitor according to the current signal and the voltage signal. It can be seen that in the present application, the power module and the electronic load module can first charge and discharge the supercapacitor respectively, and then the high-precision sampling module can sample the current signal and voltage signal of the supercapacitor and send them to the main control module. Finally, the main control module generates the test result of the supercapacitor, thereby realizing the test of the supercapacitor of the backup power supply of the wind turbine and ensuring the probability of successful operation of the wind turbine pitch system in an emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of the structure of a wind turbine supercapacitor detection device provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a power module provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of another wind turbine supercapacitor detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Wind turbines use wind power to obtain energy for power generation, but the wind power faced by wind turbines is not always within the design tolerance range. When a wind turbine faces wind power that exceeds its design tolerance range, it often chooses variable pitch according to the design response method. Variable pitch is a way to reduce the wind damage to the wind turbine by changing the angle of the wind blades to reduce the force area of ​​the wind blades.

[0041] The speed of the wind turbine is determined by the angle of the blades adjusted by the pitch control system. The pitch control system also has the function of emergency feathering of the blades to ensure safe braking of the wind turbine in an emergency and prevent the blades from losing control. The pitch control system has two power supplies, the grid power supply and the backup power supply, to prevent the turbine from failing to work and being safely braked when the grid fails. Therefore, the stability of the backup power supply will ensure the safe operation of the wind turbine.

[0042] Supercapacitors are widely used in backup power supplies due to their high power density, fast charge and discharge speed, and many charge and discharge cycles. They are connected in series to match the voltage level of the backup power supply. When the capacitance value of a supercapacitor cell changes due to changes in electrical parameters, open circuits, or breakdown, the voltage on the supercapacitor cell will exceed the rated value or even cause damage, thus affecting the normal power supply of the backup power supply. However, the existing supercapacitor test system is large in size and requires the cooperation of the host computer software. At the same time, it cannot match the rated voltage used by the supercapacitor in the backup power supply, so it is impossible to test the supercapacitor in the backup power supply.

[0043] Therefore, there is an urgent need for a wind turbine supercapacitor detection device to detect the supercapacitor in the backup power supply to ensure the probability of successful operation of the wind turbine pitch control system in an emergency.

[0044] In view of the above problems, an embodiment of the present application provides a detection device for a supercapacitor of a wind turbine generator, which can detect the supercapacitor in a backup power supply.

[0045] See also Figure 1 A wind turbine supercapacitor detection device provided in an embodiment of the present application includes: a main control module 101, a high-precision sampling module 102, an electronic load module 103 and a power supply module 104, and the main control module 101 is connected to the high-precision sampling module 102, the electronic load module 103 and the power supply module 104 respectively.

[0046] The main control module 101 is used to send a charging instruction to the power supply module 104, a discharging instruction to the electronic load module 103, and a sampling instruction to the high-precision sampling module 102;

[0047] The power module 104 is used to charge the supercapacitor (not shown in the figure) according to the charging instruction;

[0048] The electronic load module 103 is used to discharge the supercapacitor according to the discharge instruction;

[0049] The high-precision sampling module 102 is used to sample the current signal and the voltage signal of the supercapacitor according to the sampling instruction, and send the current signal and the voltage signal to the main control module;

[0050] The main control module 101 is further used to generate a test result of the supercapacitor according to the current signal and the voltage signal.

[0051] In the embodiment of the present application, when testing the supercapacitor, the power module 104 can charge the supercapacitor to be tested according to the charging instruction after receiving the charging instruction sent by the main control module 101; the electronic load module 103 can discharge the supercapacitor to be tested according to the discharge instruction after receiving the discharge instruction sent by the main control module 101, so that the high-precision sampling module 102 can collect the voltage signal and current signal of the supercapacitor to be tested when it is working. After receiving the sampling instruction sent by the main control module 101, the high-precision sampling module 102 can sample the current signal and voltage signal of the supercapacitor to be tested according to the sampling instruction, and send it to the main control module 101, so that the main control module 101 generates the test result of the supercapacitor according to the current signal and the voltage signal. Specifically, the main control module 101 can first determine whether the current signal and the voltage signal are within a reasonable range. If the current signal and the voltage signal are both within a reasonable range, it can be determined that the test result of the supercapacitor is normal; if the current signal or the voltage signal is outside a reasonable range, it can be determined that the test result of the supercapacitor is abnormal. In a possible implementation, the test result of the supercapacitor may also include a voltage signal and a current signal of the supercapacitor.

[0052] It should be noted that the supercapacitor can be connected to the electronic load module 103 and the power module 104 respectively.

[0053] In one possible implementation, Figure 2 As shown, the power supply module 104 may include a current conversion unit 201 and a constant current power supply unit 202; the current conversion unit 201 is used to convert alternating current into direct current and output direct current to the constant current power supply unit 202; the constant current power supply unit 202 is used to perform constant current charging to the supercapacitor according to the charging instruction.

[0054] It is understandable that the current conversion unit 201 can convert 220V AC into DC power, and then output a constant current through the constant current power supply unit 202 to charge the supercapacitor. The constant current power supply unit 202 is used to charge the supercapacitor with a constant current. The switching power supply dedicated chip LT8390 can be selected, and its input voltage range is 4V to 60V, and the output voltage range is 0V to 60V. Four 4N-channel MOSFETs of model BSC059N04LSG can be selected to form a four-switch BUCK-BOOST structure, and the output voltage is controlled by setting the voltage divider ratio of the feedback voltage, and the maximum operating current of the constant current power supply unit is limited by setting the potential of the current control terminal.

[0055] In a possible implementation, the power module 104 may also include a protection circuit 203, which is connected to the constant current power supply unit 202; the protection circuit 203 is used to prevent current backflow. It can be understood that since the supercapacitor removed from the fan has an initial voltage, when the supercapacitor is connected to the test interface, if the capacitor voltage is greater than the initial voltage of the constant current power supply unit, the capacitor current will flow to the power module, causing damage to the power module. N-channel MOSFET can be used to implement current backflow protection, and the voltages of the power module and the supercapacitor are respectively connected to the positive and negative input terminals of the voltage comparator for comparison. When the charging voltage of the power module is greater than the voltage across the supercapacitor, the comparator outputs a high level, turning on the N-channel MOSFET, so that the charging current flows to the supercapacitor; when the charging voltage of the power module is lower than the voltage across the supercapacitor, the voltage comparator outputs a low level, the N-channel MOSFET is turned off, and the body diode of the MOSFET is reversely cut off, thereby effectively suppressing current backflow and protecting the power module. The voltage comparator can use a single-channel voltage comparator TLV721 with a push-pull output function. A 12V isolated power supply is used to power the voltage comparator, and resistors and diodes can be set to protect the pins of the voltage comparator.

[0056] In a possible implementation, the electronic load module 103 may include a main control chip, a MOS tube constant current circuit and a MOS tube control circuit, and the main control chip is connected to the MOS tube constant current circuit and the MOS tube control circuit respectively.

[0057] Specifically, the main control chip of the electronic load module 103 can adopt a STC8A4K64S2A12 microprocessor, and a REF02C dedicated reference voltage chip to obtain a 5V standard reference voltage.

[0058] The MOS tube constant current circuit is the core part of the electronic load. By controlling the MOS tube to work in the constant current area, the MOS tube constant current load state is realized. In the MOS tube load circuit, four MOS tubes can be connected in parallel to shunt the current to reduce the heat generated by a single MOS tube. The MOS tube can be an N-type MOS tube IRF250, with a maximum reverse withstand voltage of 300V and a maximum through current of 30A; the operational amplifier can be used to drive the MOS tube, and the conduction depth of the MOS tube can be controlled by outputting a ±12V voltage; the two 0.1Ω resistors can be constantan wires, which are used for current sampling and current detection by the main control chip. The operational amplifier can form a differential amplifier circuit with the other three resistors to control the current impact of the MOS tube when it is working through negative feedback.

[0059] The MOS control circuit is used to input a voltage signal to the positive electrode of the operational amplifier driven by the MOS tube, and control the conduction depth of the MOS tube by outputting voltage signals of different sizes. Specifically, the main control chip STC8A4K64S2A12 can be used to control the digital to analog converter (DAC) chip to output a voltage of 0V to 5V. The DAC chip can use the DAC7512 digital to analog converter chip, and the output end of the DAC7512 can be connected to a voltage follower to isolate the DAC output end and the operational amplifier driven by the MOS tube, thereby improving the load capacity of the DAC. The operational amplifier of the voltage follower can select the operational amplifier OP07 for low offset voltage drift.

[0060] In a possible implementation, the high-precision sampling module 102 includes a 24-bit high-precision analog-to-digital converter chip. It is understandable that the high-precision sampling module 102 can use a 24-bit high-precision analog-to-digital converter (ADC) chip ADS1256. ADS1256 is connected and communicated with the main control module 101 via a high-speed SPI interface, a 7.68MHz crystal oscillator is externally connected to the clock signal pin, a 5V power supply is used for the analog power supply pin, and a 3.3V power supply is used for the digital power supply pin. The reference voltage signal of the ADC chip uses a standard reference voltage chip ADR431 to provide a 2.5V standard voltage, so that the voltage resolution of the ADC chip is as low as 0.15μV. Multiple groups of ceramic capacitors are connected in parallel at both ends of the reference voltage to ensure that the power supply is pure, and high-precision sampling of voltage signals and current signals can be achieved. An RC low-pass filter circuit can also be added to the input end of the analog voltage signal to filter out high-frequency noise.

[0061] In one possible implementation, Figure 3 As shown, the device also includes a liquid crystal display module, which is connected to the main control module 101; the main control module 101 is also used to send the test result of the supercapacitor to the liquid crystal display module; the liquid crystal display module is used to display the test result. It can be understood that after the main control module 101 generates the test result of the supercapacitor, in order to facilitate the user to intuitively obtain the test result of the supercapacitor, the test result of the supercapacitor generated by the main control module 101 can be displayed by setting a liquid crystal display module, so that the user can perform corresponding operations according to the test result of the supercapacitor, thereby ensuring the probability of successful operation of the wind turbine pitch system in an emergency.

[0062] In one possible implementation, the device further includes a key module, which is connected to the main control module 101; the key module is used to receive a test control instruction input by a user and send the test control instruction to the main control module 101; the main control module 101 is also used to test the supercapacitor according to the test control instruction. It can be understood that in order to facilitate the user to control the test process of the supercapacitor, a key module can be set to receive the test control instruction input by the user. Among them, the test control instruction may include starting the test, pausing the test, and ending the test. The key module can send the test control instruction input by the user to the main control module 101, so that the main control module 101 starts testing the supercapacitor, or pauses the test of the supercapacitor, or ends the test of the supercapacitor.

[0063] In a possible implementation, the device further includes a storage module, which is connected to the main control module 101; the main control module 101 is also used to send the test result of the super capacitor to the storage module; the storage module is used to store the test result. Specifically, the storage module can also be called a USB storage module. The test result of the super capacitor can be stored by setting the storage module so that the user can call it when needed. Specifically, the storage module can be a USB storage module, and a CH376 USB interface chip can be selected. The main control module 101 and CH376 can adopt a hardware SPI serial connection mode. The CH376 chip is directly connected to the corresponding pins of the main control module 101 through pins such as SDO, SDI, SCK, and SCS. The UD+ and UD- wiring ports are USB data ports connected to an external USB base. The RST1 pin is connected to the GPIO port of the main control module 101. A resistor can be set to limit the current provided to the external USB device as a USB host. Two capacitors can be set for CH376 power decoupling, wherein the first capacitor is a tantalum capacitor with a capacity of 10μF. The second capacitor is a monolithic or high-frequency ceramic capacitor with a capacity of 4700 pF to 0.02 μF. Two additional capacitors may be provided for external power supply decoupling.

[0064] In one possible implementation, the device further includes a printing module, which is connected to the main control module; the main control module is also used to send the test results of the supercapacitor to the printing module; the printing module is used to print the test results. It can be understood that after the main control module 101 generates the test results of the supercapacitor, in order to facilitate the user to intuitively obtain the test results of the supercapacitor, the test results can be printed by setting the printing module. Specifically, the printing module can also be called a printer module. The printing module adopts a thermal printer module and communicates with the main control module 101 through the UART serial port. The main control module 101 can send printing information and printing instructions to the printing module through the serial port.

[0065] It can be seen from this that the wind turbine supercapacitor detection device provided in the embodiment of the present application can first charge and discharge the supercapacitor by the power module and the electronic load module respectively, and then the high-precision sampling module samples the current signal and voltage signal of the supercapacitor and sends them to the main control module, and finally the main control module generates the test result of the supercapacitor, thereby realizing the testing of the supercapacitor in the backup power supply of the wind turbine and ensuring the probability of successful operation of the wind turbine pitch system in an emergency.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind turbine supercapacitor detection device, characterized in that: The device comprises: a main control module, a high-precision sampling module, an electronic load module and a power supply module, wherein the main control module is connected to the high-precision sampling module, the electronic load module and the power supply module respectively; The main control module is used to send a charging instruction to the power supply module, a discharging instruction to the electronic load module, and a sampling instruction to the high-precision sampling module; The power module is used to charge the supercapacitor according to the charging instruction; The electronic load module is used to discharge the supercapacitor according to the discharge instruction; The high-precision sampling module is used to sample the current signal and the voltage signal of the supercapacitor according to the sampling instruction, and send the current signal and the voltage signal to the main control module; The main control module is further used to generate a test result of the supercapacitor according to the current signal and the voltage signal.

2. The device according to claim 1, characterized in that The power supply module includes a current conversion unit and a constant current power supply unit; The current conversion unit is used to convert alternating current into direct current, and output the direct current to the constant current power supply unit; The constant current power supply unit is used to perform constant current charging on the super capacitor according to the charging instruction.

3. The device according to claim 1, characterized in that The electronic load module includes a main control chip, a MOS tube constant current circuit and a MOS tube control circuit; The main control chip is connected to the MOS tube constant current circuit and the MOS tube control circuit respectively.

4. The device according to claim 1, characterized in that The high-precision sampling module includes a 24-bit high-precision analog-to-digital converter chip.

5. The device according to claim 1, characterized in that The device also includes a liquid crystal display module, which is connected to the main control module; The main control module is also used to send the test result of the super capacitor to the liquid crystal display module; The liquid crystal display module is used to display the test result.

6. The device according to claim 1, characterized in that The device also includes a key module, which is connected to the main control module; The key module is used to receive the test control instruction input by the user and send the test control instruction to the main control module; The main control module is also used to test the supercapacitor according to the test control instruction.

7. The device according to claim 1, characterized in that The device also includes a storage module, and the storage module is connected to the main control module; The main control module is also used to send the test result of the supercapacitor to the storage module; The storage module is used to store the test result.

8. The device according to claim 1, characterized in that The device also includes a printing module, and the printing module is connected to the main control module; The main control module is also used to send the test result of the supercapacitor to the printing module; The printing module is used to print the test result.

9. The device according to claim 2, characterized in that The power supply module also includes a protection circuit, and the protection circuit is connected to the constant current power supply unit; The protection circuit is used to prevent current backflow.

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