Integrated backup power supply device for variable pitch control system

Abstract

The invention relates to an integrated back-up power supply device for a variable pitch control system. The integrated back-up power supply device comprises an energy storage unit, a protection unit, a voltage-sharing control unit and a fault monitoring unit, the energy storage unit comprises a plurality of super-capacitor monomers, the plurality of super-capacitor monomers are connected in series to form super-capacitor modules, the super-capacitor modules are installed on the energy storage plate, the adjacent super-capacitor modules are connected in series, the protection unit is a fuse, and the fuse provides overcurrent protection for equipment; the number of the voltage-sharing control units is the same as that of the super-capacitor monomers, and the voltage-sharing control units and the super-capacitor monomers are in one-to-one correspondence; the voltage-sharing control units control the single super-capacitor monomers to work in a designed voltage range through the voltage-sharing circuits; the fault monitoring unit monitors the super-capacitor module, and feeds back an overvoltage state as a fault signal when overvoltage occurs in the super-capacitor module in a monitoring range. According to the invention, the cost of purchase, production, maintenance and other links of the backup power supply of the variable pitch control system can be effectively reduced while the use requirements of the system can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an integrated backup power supply device for a pitch control system. Background Art

[0002] At present, the backup power supply of the electrical pitch control system in the wind turbine generator set is composed of a combination of supercapacitor standard modules. When the power grid is powered off, the supercapacitor is responsible for providing energy to the pitch control system, driving the pitch motor to control the blades to perform the pitch action, and ensuring the safety of the unit in the event of a power outage. At present, the supercapacitor module of the pitch control system needs to be designed in addition to a cabinet for installing the supercapacitor module. In view of the fierce competition in the wind power industry and the high cost pressure, this design integrates the backup power supply of the pitch control system to meet the needs of the system and reduce the product procurement and production costs and installation and maintenance costs. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide an integrated backup power supply device for a pitch control system. On the premise of ensuring that the needs of system use are met, the composition and installation method of the backup power supply of the pitch control system is changed, and the backup power supply of the pitch control system is directly designed as an integrated backup power supply. This can reduce the system's material procurement and production costs and reduce subsequent maintenance costs.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An integrated backup power supply device for a pitch control system, comprising an energy storage unit, a protection unit, a voltage balancing control unit, a fault monitoring unit and an external electrical interface; the energy storage unit comprises a plurality of supercapacitor cells, a plurality of supercapacitor cells are connected in series to form a supercapacitor module, the supercapacitor module is mounted on an energy storage board, adjacent supercapacitor modules are connected in series, the protection unit is a fuse, and the fuse provides overcurrent protection for the equipment; the number of the voltage balancing control units is the same as the number of supercapacitor cells and corresponds one to one, and the voltage balancing control unit controls a single supercapacitor cell to operate within a designed voltage range through a voltage balancing circuit; the fault monitoring unit monitors the supercapacitor module, and when an overvoltage occurs in a supercapacitor module within the monitoring range, the overvoltage state is fed back as a fault signal.

[0006] It also includes a cabinet, which includes an outer shell. The fuse is installed on the inner wall of the cabinet. The protection level of the cabinet is IP54, and the external electrical interface is installed on the cabinet.

[0007] Wherein, the fuse is an openable and closed fuse.

[0008] Among them, when the voltage of the supercapacitor cell is higher than the design value, the control chip of the voltage equalization circuit will automatically turn on the capacitor cell pressure relief function until the voltage of the supercapacitor cell is discharged to the normal working voltage.

[0009] Wherein, the voltage balancing control unit also includes a passive voltage balancing resistor.

[0010] Among them, the fault signal has the following two signal outputs: one is that when the monitored supercapacitor has an overvoltage condition, the output signal changes from 0Vdc to 24Vdc; the other is that when the monitored supercapacitor has an overvoltage condition, the output signal changes from 24Vdc to 0Vdc.

[0011] Wherein, a temperature sensor PT100 is installed in the cabinet.

[0012] In summary, the present invention can effectively reduce the purchase and production cost of the backup power supply of the pitch control system and reduce the subsequent maintenance cost while meeting the system usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The invention discloses a principle frame of an integrated backup power supply device for a pitch control system.

[0014] Figure 2 This is a layout diagram of an integrated backup power supply device for a pitch control system according to the present invention.

[0015] Figure 3 This is the circuit diagram of a single energy storage board of the energy storage unit.

[0016] Figure 4 This is the voltage equalization circuit diagram of the supercapacitor cell.

[0017] Figure 5 A schematic diagram of the cabinet. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0019] like Figure 1As shown, an integrated backup power supply device for a pitch control system is used as a backup power supply for the pitch control system, including an energy storage unit, a protection unit, a voltage balancing control unit, a fault monitoring unit and an external electrical interface; the energy storage unit mainly stores energy, including a plurality of supercapacitor monomers, which can be connected in series with supercapacitor monomers of different specifications according to the backup power supply energy required by the pitch control system, thereby forming backup power supplies of different voltage levels or different capacities, and multiple supercapacitor monomers are connected in series to form a supercapacitor module, which is installed on the energy storage board, and adjacent supercapacitor modules are connected in series, and the protection unit is Fuse, the fuse provides overcurrent protection for the equipment; the number of the voltage balancing control units is the same as the number of supercapacitor cells and corresponds one to one. The voltage balancing control unit controls a single supercapacitor cell to work within the designed voltage range through a voltage balancing circuit; when the voltage of a supercapacitor cell is higher than the designed value, the control chip of the voltage balancing circuit will automatically turn on the capacitor cell pressure relief function until the voltage of the supercapacitor cell is discharged to the required voltage, ensuring that the capacitor cell voltage does not exceed the designed value. At the same time, a passive voltage balancing resistor is also designed in the voltage balancing control unit. The circuit consists of a detection control chip, a voltage balancing resistor, a discharge resistor, etc. The circuit principle is as follows Figure 4 When the voltage of the capacitor C1A exceeds the discharge voltage threshold of the U1A chip, which is 2.65Vdc, the selection port is low level valid. Figure 4 When the voltage between the VDD at pin 1 and the GND at pin 2 of the U1A chip is higher than 2.65Vdc, the chip outputs voltage at pin 5, consumes energy through the R2A discharge resistor, and limits the voltage of the supercapacitor monomer to within the range of 2.65Vdc. R1A is a passive voltage equalizing resistor.

[0020] The energy storage unit is mainly used to store energy. The unit is composed of 180 supercapacitor cells (cell specifications are 2.7V360F) connected in series. Due to the differences in capacity and internal resistance between supercapacitor cells, it is necessary to allocate capacity levels to supercapacitor cells during the module assembly process (this measure can require cell suppliers to perform grading, and the cells used in the variable pitch backup power supply should be under the same capacity level standard conditions). At the same time, active and passive voltage balancing are used in the circuit design to balance the supercapacitor cells, and voltage detection alarm function, overcurrent protection function, half-voltage detection function, and temperature detection function are designed. Figure 2 As shown, the energy storage unit is divided into four energy storage boards in total. The circuit diagram of a single energy storage board is as follows Figure 3 shown.

[0021] To facilitate the installation and layout of each backup power supply unit, the energy storage unit is designed as four identical energy storage boards, each of which contains 45 supercapacitor cells. When different backup power supply capacities are required, the supercapacitor specifications and models used in the energy storage board can be optimized and adjusted according to system needs to form backup power supplies of different voltage levels or capacities.

[0022] The fault monitoring unit monitors the supercapacitor module and monitors the supercapacitor modules in series in groups. Each fault detection unit monitors the voltage of 15 supercapacitor monomers in series (there are three fault detection units on a single energy storage board, and the three detection units are the same). When the supercapacitor modules in series within the monitoring range are over-voltage, the over-voltage state is fed back in time as a fault signal. The feedback signal has two signal outputs. One is that when the monitored supercapacitor is over-voltage, the output signal changes from 0Vdc to 24Vdc; the other is that when the monitored supercapacitor is over-voltage, the output signal changes from 24Vdc to 0Vdc. The circuit is composed of an isolation diode, a detection control chip, a resistor, a transistor, an optical coupler, etc.

[0023] Specifically, the fuse is an on-off operated fuse, which can be used to cut off the power supply interface of the backup power supply. The fuse base is installed on the cabinet wall through the mounting hole designed on the cabinet, which meets the overall protection level design requirements of the backup power supply device. The on-off of the fuse can be used to cut off the power supply interface of the backup power supply.

[0024] Specifically, it also includes a cabinet, which includes an outer shell, a fuse installed on the inner wall of the cabinet, the cabinet protection level is IP54, and the external electrical interface is installed on the cabinet. The integrated backup power supply device uses a carbon steel painted shell with a design protection level of IP54. The relevant circuit board is directly installed in the device cabinet, and the external electrical interface on the cabinet uses a heavy-duty connector for easy operation. Figure 5 shown.

[0025] Specifically, the integrated backup power supply device has a built-in temperature sensor PT100, which can monitor the temperature status inside the device and feedback the signal through the heavy-duty connector on the cabinet.

[0026] Finally, it should be noted that those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An integrated backup power supply device for a pitch control system, characterized in that: It includes energy storage unit, protection unit, voltage balancing control unit, fault monitoring unit and external electrical interface; The energy storage unit includes a plurality of supercapacitor cells, a plurality of supercapacitor cells are connected in series to form a supercapacitor module, the supercapacitor module is mounted on the energy storage board, and adjacent supercapacitor modules are connected in series; The protection unit is a fuse, and the fuse provides overcurrent protection for the device; The number of the voltage balancing control units is the same as the number of supercapacitor cells and corresponds one to one. The voltage balancing control unit controls a single supercapacitor cell to operate within a designed voltage range through a voltage balancing circuit. The fault monitoring unit monitors the supercapacitor module, and when an overvoltage occurs in the supercapacitor module within the monitoring range, the overvoltage state is fed back as a fault signal.

2. The integrated backup power supply device for a pitch control system according to claim 1, characterized in that: It also includes a cabinet, which includes an outer shell. The fuse is installed on the inner wall of the cabinet. The protection level of the cabinet is IP54, and the external electrical interface is installed on the cabinet.

3. The integrated backup power supply device for a pitch control system according to claim 2, characterized in that: The fuse is an openable and closeable fuse.

4. The integrated backup power supply device for a pitch control system according to claim 3, characterized in that: When the voltage of the supercapacitor cell is higher than the design value, the control chip of the voltage equalization circuit will automatically turn on the capacitor cell pressure relief function until the voltage of the supercapacitor cell is discharged to the normal working voltage.

5. The integrated backup power supply device for a pitch control system according to claim 4, characterized in that: The voltage balancing control unit also includes a passive voltage balancing resistor.

6. The integrated backup power supply device for a pitch control system according to claim 5, characterized in that: The fault signal has the following two signal outputs: one is that when the monitored supercapacitor has an overvoltage condition, the output signal changes from 0Vdc to 24Vdc; the other is that when the monitored supercapacitor has an overvoltage condition, the output signal changes from 24Vdc to 0Vdc.

7. The integrated backup power supply device for a pitch control system according to claim 6, characterized in that: A temperature sensor PT100 is installed in the cabinet.

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