Fan safety chain, wind generating set and control system

Abstract

The utility model discloses a fan safety chain, a wind generating set and a control system, relates to the technical field of wind power generation, and realizes automatic yaw prohibition when cable torsion exceeds an allowable maximum torsion limit. The fan safety chain comprises a first-stage safety chain and a second-stage safety chain, wherein the second-stage safety chain comprises a twisted cable switch SN1, a relay K2 and a relay K3; wherein a coil of the relay K2 is connected in series with the cable twisting switch SN1; the cable twisting switch SN1 is switched off when the cable twisting exceeds the allowable maximum twisting limit; a normally open contact of the relay K2 is connected in series with a coil of the relay K3; and a normally open contact of the relay K3 is connected in series in the yaw enabling loop.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a wind turbine safety chain, a wind turbine generator set and a control system. Background Art

[0002] The control system of a wind turbine usually includes multiple levels of protection mechanisms to ensure the safe and stable operation of the wind turbine under various working conditions. Among them, the wind turbine safety chain is the last protection mechanism. Most wind turbines use a two-level safety chain protection logic, including a primary safety chain and a secondary safety chain. The primary safety chain is an emergency shutdown safety chain. The secondary safety chain is responsible for cable torsion monitoring, etc.

[0003] The yaw system of a wind turbine is responsible for adjusting the direction of the nacelle and blades to align them with the wind direction to maximize energy capture. During the yaw process, if the cable is overstretched, twisted or damaged, it may cause cable breakage or other failures. The cable twist switch SN1 in the secondary safety chain can act when the cable twist exceeds the maximum allowable twist limit, triggering the controller to send a warning signal, but the secondary safety chain does not have the function of automatically prohibiting yaw when the cable twist exceeds the maximum allowable twist limit. Utility Model Content

[0004] In view of the above problems, the present application provides a wind turbine safety chain, a wind turbine generator set and a control system to achieve the purpose of automatically prohibiting yaw when the cable torsion exceeds the maximum allowable torsion limit. The specific solution is as follows:

[0005] In a first aspect, the present application provides a wind turbine safety chain, comprising: a primary safety chain and a secondary safety chain, wherein the secondary safety chain comprises a twist cable switch SN1, a relay K2, and a relay K3;

[0006] The coil of the relay K2 is connected in series with the twist cable switch SN1; the twist cable switch SN1 is disconnected when the twist of the cable exceeds the maximum permissible twist limit;

[0007] The normally open contact of relay K2 is connected in series with the coil of relay K3;

[0008] The normally open contact of relay K3 is connected in series in the yaw enabling circuit.

[0009] In a possible implementation, the relay K3 has at least three normally open contacts in the yaw enabling circuit:

[0010] The first normally open contact of relay K3 is connected in series with the coil of the unit clockwise yaw relay K5;

[0011] The second normally open contact of relay K3 is connected in series with the coil of counterclockwise yaw relay K4;

[0012] The third normally open contact of relay K3 is connected in series with the coil of yaw brake relay K6;

[0013] The normally open contact of the unit clockwise yaw relay K5 is connected in series to the unit clockwise yaw control circuit;

[0014] The normally open contact of the counterclockwise yaw relay K4 is connected in series to the counterclockwise yaw control circuit of the unit;

[0015] The normally open contact of the yaw brake relay K6 is connected in series in the yaw brake control circuit.

[0016] In a possible implementation, the primary safety chain is connected in series with a normally open contact of a safety chain relay KA1, and when any node on the primary safety chain is disconnected, the primary safety chain is powered off;

[0017] The secondary safety chain is connected in series with the normally open contact of the safety chain relay KA1, the normal signal interface of the controller, the coil of the safety chain control relay K1 and the first normally open contact of the safety chain control relay K1. When any node on the secondary safety chain is disconnected, the secondary safety chain is powered off;

[0018] On the secondary safety chain, the first normally open contact of the safety chain control relay K1, the safety chain reset switch SB3E and the software reset safety chain interface RF are connected in parallel; wherein, the safety chain reset switch SB3E is a manual switch, and the software reset safety chain interface RF is used to be turned on or off under the control of the controller.

[0019] A second aspect of the present application provides a control system for a wind turbine generator set, comprising: a wind turbine safety chain according to the above-mentioned first aspect or any implementation of the first aspect.

[0020] A third aspect of the present application provides a wind turbine generator set, including the control system of the above-mentioned wind turbine generator set.

[0021] By means of the above technical scheme, the twist cable switch SN1 in the wind turbine safety chain provided by the present application is only actuated when the cable torsion exceeds the maximum allowable torsion limit. When the twist cable switch SN1 is not actuated, that is, when the twist cable switch SN1 is closed, the coil of relay K2 is energized, the normally open contact of relay K2 is closed, the coil of relay K3 is energized, the normally open contact of relay K3 is closed, thereby energizing the yaw enabling circuit and allowing yaw; and when the twist cable switch SN1 is actuated, the coil of relay K2 is de-energized, the normally open contact of relay K2 is disconnected, the coil of relay K3 is de-energized, the normally open contact of relay K3 is disconnected, thereby cutting off the yaw enabling circuit, thereby achieving the function of automatically prohibiting yaw when the cable torsion exceeds the maximum allowable torsion limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0023] Figure 1 A schematic diagram of the structure of a wind turbine generator set provided in this application;

[0024] Figure 2 A circuit schematic diagram of a wind turbine safety chain provided in this application;

[0025] Figure 3 A circuit schematic diagram of another wind turbine safety chain provided in this application;

[0026] Figure 4 A circuit schematic diagram of a yaw enabling loop provided in this application. DETAILED DESCRIPTION

[0027] Wind energy is a kind of usable energy provided to humans by the work done by air flow. It is a renewable energy source that is inexhaustible, pollution-free and is widely used in the field of power generation.

[0028] like Figure 1 As shown, a wind turbine generator set is a device that converts wind energy into electrical energy. It mainly includes a wind wheel 1, a transmission device 2, a generator 3 and a control system ( Figure 1 not shown).

[0029] The wind wheel 1 is used to convert wind energy into mechanical energy. It is usually composed of a plurality of blades. Under the action of wind energy, the blades rotate, and the energy (mechanical energy) of the blade rotation is transmitted to the generator 3 through the transmission device 2.

[0030] The transmission device 2 is mainly composed of a reducer and a shaft system. The reducer reduces the high-speed rotation speed of the wind wheel 1 to a speed suitable for the generator 3, and the shaft system supports the entire rotating system of the wind turbine generator set.

[0031] The generator 3 is used to convert the mechanical energy transmitted from the wind wheel 1 through the transmission device 2 into electrical energy.

[0032] The control system of a wind turbine usually includes multiple levels of protection mechanisms, from basic software protection to higher-level hardware protection, to ensure the safe and stable operation of the wind turbine under various working conditions. Software protection usually involves real-time monitoring of the operating status of the wind turbine and adjusting the operating parameters of the wind turbine according to preset algorithms and logic to ensure its safe and stable operation. However, when a wind turbine encounters a serious fault or abnormal situation, software protection may not be able to completely prevent damage or accidents to the wind turbine. In this case, the wind turbine safety chain, as the last protection mechanism of the wind turbine (the wind turbine safety chain is after the software protection of the wind turbine) and the highest level of protection mechanism, plays a vital role.

[0033] The wind turbine safety chain, also known as the wind turbine safety protection system, is a software and hardware protection measure independent of the computer system. The wind turbine safety chain adopts a reverse logic design, connecting the fault nodes that may cause serious damage to the wind turbine in series into a loop. Once one of the nodes is activated, the entire loop will be powered off, the wind turbine will enter an emergency shutdown state, and the main control system and the converter system will be locked, thereby protecting the wind turbine from further damage. If the faulty node cannot be restored, the normal operation of the entire wind turbine cannot be achieved.

[0034] like Figure 2 As shown, most wind turbines use a two-stage safety chain protection logic, including a primary safety chain and a secondary safety chain.

[0035] For the sake of reference and clarity, first Figure 2 The reference numerals used in the drawings are explained as follows: Figure 2 In the figure, the characters marked on the left side of the contact are the number of the relay to which the contact belongs. Since a relay may have multiple contacts, in order to distinguish different contacts of the same relay, Figure 2 Different characters are also marked on the terminals of different contacts of the same relay. Figure 2 Taking the safety chain relay KA1 as an example, Figure 2 The rectangular box filled with black slashes in the figure represents the safety chain relay KA1. Figure 2 Only some of the components and circuits integrated inside the safety chain relay KA1 are shown; inside the safety chain relay KA1, the normally open contacts marked with 13 and 14 at both ends are the first normally open contacts 13 / 14 of the safety chain relay KA1, and the normally open contacts marked with 23 and 24 at both ends are the second normally open contacts 23 / 24 of the safety chain relay KA1. Figure 2 The marking method of other components (such as relay coils, etc.) can be obtained in the same way and will not be repeated here.

[0036] It should also be noted that if the normally open contacts in series on a circuit are disconnected, the circuit is de-energized, which means that the normally open contacts are in a closed state when the circuit is energized. For a relay, when the relay coil is energized, the normally open contacts of the relay are closed and the normally closed contacts are disconnected, and when the relay coil is de-energized, the normally open contacts of the relay are disconnected and the normally closed contacts are closed. In addition to relays, the other switches mentioned in this article have normally closed contacts, which means that when the switch is not triggered, the switch is in a closed state, and when the switch is triggered, the switch enters an open state; the other switches mentioned in this article have normally open contacts, which means that when the switch is not triggered, the switch is in an open state, and when the switch is triggered, the switch enters a closed state.

[0037] The protection logic of the primary safety chain and the secondary safety chain in Figure 2 are described in detail below:

[0038] 1) Primary safety chain

[0039] The first-level safety chain is the emergency stop safety chain. The components of the first-level safety chain include: safety chain relay KA1, tower bottom emergency stop switch SJI, cabin emergency stop switch SJ2, safety chain control relay K1, tower bottom reset switch SB1E and cabin reset switch SB2E, etc.

[0040] In the primary safety chain, the coil of the safety chain relay KA1 ( Figure 2 (not shown), the first normally closed contact 11 / 12 of the tower bottom emergency stop switch SJ1 and the first normally closed contact 11 / 12 of the cabin emergency stop switch SJ2 are connected in series. Based on this, when the tower bottom emergency stop switch SJ1 or the cabin emergency stop switch SJ2 is manually triggered (that is, its normally closed contacts are disconnected), the primary safety chain is de-energized, the coil of the safety chain relay KA1 loses power, and the first normally open contact 13 / 14 of the safety chain relay KA1 and the second normally open contact 23 / 24 of the safety chain relay KA1 are disconnected.

[0041] In the primary safety chain, the first normally open contact 13 / 14 of the safety chain relay KA1 and the second normally open contact 23 / 24 of the safety chain relay KA1 are synchronous linkage contacts connected in parallel. The synchronous linkage contacts, the coil A1 / A2 of the safety chain control relay K1 and the first normally open contact 13 / 14 of the safety chain control relay K1 are connected in series. Based on this, after the synchronous linkage contact is disconnected, the coil A1 / A2 of the safety chain control relay K1 loses power, and the first normally open contact 13 / 14 of the safety chain control relay K1 is disconnected accordingly. At this time, the wind turbine generator set is shut down urgently and the fixing function is locked.

[0042] After the coil A1 / A2 of the safety chain control relay K1 loses power, the first normally closed contact 11 / 12 of the safety chain control relay K1 is closed. In the primary safety chain, the first normally open contact 13 / 14 of the tower bottom reset switch SB1E is connected in parallel with the first normally open contact 13 / 14 of the cabin reset switch SB2E and then connected in series with the first normally closed contact 11 / 12 of the safety chain control relay K1. Based on this, after the first normally closed contact 11 / 12 of the safety chain control relay K1 is closed, by manually triggering the tower bottom reset switch SB1E or the cabin reset switch SB2E to act (that is, closing its normally open contact), the first normally closed contact 11 / 12 of the safety chain control relay K1 can be connected in series with the first normally open contact 13 / 14 of the tower bottom reset switch SB1E or the first normally open contact 13 / 14 of the cabin reset switch SB2E to restore the power supply to the primary safety chain circuit. At this time, the primary safety chain is reset and the wind turbine generator set resumes normal operation.

[0043] Secondary safety chain

[0044] The devices that make up the secondary safety chain include: safety chain relay KA1, safety chain control relay K1, cabin vibration switch SZI, generator overspeed switch SS1, PLC OK signal interface (that is, the normal signal interface of the controller, when the PLC self-check is normal, it sends a PLC OK signal to make the PLC OK signal interface 1 / 2 in the on state), safety chain reset switch SB3E, cabin vibration switch SZI and relay K3, etc.

[0045] In the secondary safety chain, the first normally closed contact 11 / 12 of the cabin vibration switch SZI, the first normally open contact 11 / 12 / 14 of the generator overspeed switch SS1, the PLC OK (i.e., the controller is normal) signal interface 1 / 2, the coil A1 / A2 of the safety chain control relay K1, and the first normally open contact 13 / 14 of the safety chain control relay K1 are connected in series. When any one of the nodes is disconnected, the secondary safety chain is powered off, the coil of the safety chain control relay K1 loses power, and the first normally open contact 13 / 14 of the safety chain control relay K1 is disconnected. At this time, the wind turbine generator set is shut down urgently and the fixing function is locked.

[0046] In the secondary safety chain, the first normally open contact 13 / 14 of the safety chain control relay K1 is connected in parallel with the first normally open contact 13 / 14 of the safety chain reset switch SB3E. Based on this, when the secondary safety chain is resettable (the secondary safety chain is resettable, which means that the fault encountered by the wind turbine is a resettable fault. A resettable fault refers to a temporary or reversible fault that occurs in a wind turbine. After certain processing or intervention, this fault can restore the normal operation of the wind turbine without replacing hardware or performing major repairs. A resettable fault is opposite to a non-resettable fault, which means that once it occurs, the wind turbine cannot be reset. A fault that can be restored to normal working condition by conventional means may require replacement of hardware components or more in-depth diagnosis and repair) that is, when the disconnected node has been closed, but because the secondary safety chain is still in the power-off state, the first normally open contact 13 / 14 of the safety chain control relay K1 is still in the disconnected state. At this time, by manually triggering the safety chain reset switch SB3E (that is, closing its normally open contact), the first normally open contact 13 / 14 of the safety chain reset switch SB3E can be used to bypass the first normally open contact 13 / 14 of the safety chain control relay K1 to restore power to the secondary safety chain circuit, thereby resetting the secondary safety chain.

[0047] The yaw system of a wind turbine is responsible for adjusting the direction of the nacelle and blades to align them with the wind direction to maximize energy capture. During the yaw process, if the cable is overstretched, twisted or damaged, it may cause cable breakage or other failures, so it is necessary to introduce a twist cable sensor in the yaw system. The function of the twist cable sensor is to monitor the torsion of the cable during the yaw process of the wind turbine. When the cable torsion exceeds the maximum allowable torsion limit, the first normally open contact 13 / 14 of the twist cable switch SN1 in the secondary safety chain is disconnected, and the PLC (programmable logic controller) detects that the first normally open contact 13 / 14 of the twist cable switch SN1 is disconnected, triggering a protection mechanism. The protection mechanism is to send a warning signal to prevent the cable from being overstretched, twisted or damaged.

[0048] In the secondary safety chain, the second normally closed contact 21 / 22 of the emergency stop switch SJI at the bottom of the tower is connected in series with the coil A1 / A2 of the relay K3, and the normally open contact of the relay K3 is connected in series to the yaw enabling circuit of the wind turbine generator set. Based on this, after the emergency stop switch SJI at the bottom of the tower is manually triggered, the second normally closed contact 21 / 22 of the emergency stop switch SJI at the bottom of the tower is disconnected, the coil A1 / A2 of the relay K3 loses power, and the normally open contact of the relay K3 is disconnected, so that the yaw system of the wind turbine generator set is prohibited from working.

[0049] In addition, the wind turbine safety chain also includes the first normally open contact 15 / 16 / 18 of the self-holding switch KT1, the second normally open contact 25 / 26 / 28 of the self-holding switch KT1, the second normally open contact 23 / 24 of the safety chain control relay K1, and a signal outlet for the converter. Figure 2 The power supply of the wind turbine safety chain shown is only based on 24V power supply as an example.

[0050] However, in actual use, the operation and maintenance personnel found that the above two-level safety chain protection logic has the following problems:

[0051] 1) Lack of automatic yaw inhibition when cable torsion exceeds the maximum permissible torsion limit.

[0052] 2) When the secondary safety chain can be reset, the operation and maintenance personnel must climb onto the cabin of the wind turbine to manually trigger the safety chain reset switch SB3E before it can be reset. This results in low operation and maintenance efficiency, large power loss during downtime, and safety risks for the operation and maintenance personnel during tower climbing operations.

[0053] In order to solve the above-mentioned problem 1 and / or problem 2, the embodiment of the present application provides a wind turbine safety chain, which, in order to solve the above-mentioned problem 1, Figure 2 Based on the wind turbine safety chain shown in the figure, the function of automatically prohibiting yaw after the twist cable switch SN1I is actuated is added, and the unit is safer and more stable. Figure 2 On the basis of the wind turbine safety chain shown in the figure, the function of software resetting the secondary safety chain is added, which improves the interactivity between the control system and the hardware safety chain protection. For resettable safety chain faults, the operation and maintenance personnel can reset them through remote control without having to climb up to the cabin to manually reset them, which improves the operation and maintenance efficiency, reduces the power loss caused by faults, and reduces the safety risks of operation and maintenance personnel during tower climbing operations.

[0054] The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings. A person skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0055] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0056] like Figure 3 As shown, in order to solve the above problem 1, the embodiment of the present application provides a wind turbine safety chain, which Figure 2 On the basis of the wind turbine safety chain shown, a function of automatically prohibiting yaw after the twist cable switch SN1 is actuated is added, specifically: the secondary safety chain includes the twist cable switch SN1, relay K2 and relay K3; the coil A1 / A2 of relay K2 is connected in series with the normally open contact 13 / 14 of the twist cable switch SN1; the normally open contact 13 / 14 of the twist cable switch SN1 is disconnected when the cable torsion exceeds the maximum allowable torsion limit; the normally open contact 13 / 14 of relay K2 is connected in series with the coil A1 / A2 of relay K3; the normally open contact of relay K3 is connected in series in the yaw enabling circuit.

[0057] Its working principle is analyzed as follows: the twist cable switch SN1 only operates when the cable twisting exceeds the maximum allowable twisting limit. When the twist cable switch SN1 is not operated, that is, the normally open contacts 13 / 14 of the twist cable switch SN1 are closed, the coil A1 / A2 of the relay K2 is energized, the normally open contacts 13 / 14 of the relay K2 are closed, the coil A1 / A2 of the relay K3 is energized, and the normally open contacts of the relay K3 are closed, so that the yaw enabling circuit is energized to allow yaw; and when the twist cable switch SN1 is operated, that is, the normally open contacts 13 / 14 of the twist cable switch SN1 are disconnected, the coil A1 / A2 of the relay K2 loses power, and the normally open contacts 13 / 14 of the relay K2 are disconnected. At this time, the coil A1 / A2 of the relay K3 loses power and the normally open contacts of the relay K3 are disconnected.

[0058] See also Figure 4 , the normally open contacts of relay K3 include the first normally open contact 13 / 14, the second normally open contact 23 / 24, and the third normally open contact 33 / 34; the first normally open contact 13 / 14 of relay K3 is connected in series with the coil A1 / A2 of the clockwise yaw relay K5 of the unit, the second normally open contact 23 / 24 of relay K3 is connected in series with the coil A1 / A2 of the counterclockwise yaw relay K4, the third normally open contact 33 / 34 of relay K3 is connected in series with the coil A1 / A2 of the yaw brake relay K6, and the normally open contact of the clockwise yaw relay K5 of the unit is connected in series in the clockwise yaw control circuit of the unit ( Figure 4 The normally open contact of the counterclockwise yaw relay K4 is connected in series with the counterclockwise yaw control circuit of the unit ( Figure 4 The normally open contact of the yaw brake relay K6 is connected in series with the yaw brake control circuit ( Figure 4 not shown).

[0059] based on Figure 4After the normally open contacts of relay K3 are disconnected, coil A1 / A2 of the unit's clockwise yaw relay K5, coil A1 / A2 of the counterclockwise yaw relay K4, and coil A1 / A2 of the yaw brake relay K6 lose power, and the normally open contacts of relays K4~K6 are disconnected, thereby cutting off power to the yaw enable circuit, making it impossible to receive PLC control signals, and the yaw function is disabled. Figure 4 The inside of the dotted box is divided into an interface controlled by the PLC, which can connect terminal 2 to terminal Q0.0, terminal Q0.1 or terminal Q0.2 under the control of the PLC.

[0060] Still see Figure 3 To solve the above problem 2, the present application provides a wind turbine safety chain, which Figure 2 On the basis of the wind turbine safety chain shown, the function of software resetting the secondary safety chain is added, specifically: the first normally open contact 13 / 14 of the safety chain control relay K1 is connected in parallel with the software reset safety link interface RF 1 / 2; the PLC is used to control the software reset safety link interface RF 1 / 2 to enter the conducting state when it detects that it is in a normal state and the normally open contact (i.e., the synchronous linkage contact) of the safety chain relay KA1 is closed.

[0061] Its working principle is analyzed as follows:

[0062] The secondary safety chain is connected in series with the normally open contact of the safety chain relay KA1 (i.e. the synchronous linkage contact), the first normally closed contact 11 / 12 of the cabin vibration switch SZI, the first normally open contact 11 / 12 / 14 of the generator overspeed switch SS1, the PLC OK signal interface 1 / 2, the coil A1 / A2 of the safety chain control relay K1 and the first normally open contact 13 / 14 of the safety chain control relay K1, etc. When any one of the nodes is disconnected, the secondary safety chain is powered off. At this time, the coil A1 / A2 of the safety chain control relay K1 loses power, the first normally open contact 13 / 14 of the safety chain control relay K1 is disconnected, and the unit is shut down urgently and the fixing function is locked.

[0063] In the secondary safety chain, the first normally open contact 13 / 14 of the safety chain control relay K1, the safety chain reset switch SB3E and the software reset safety link interface RF 1 / 2 are connected in parallel; the PLC is used to control the software reset safety link interface RF 1 / 2 to enter the on state when it detects that it is working normally and the normally open contact of the safety chain relay KA1 is closed. Based on this, after the software reset safety link interface RF 1 / 2 is turned on, it will bypass the first normally open contact 13 / 14 of the safety chain control relay K1 to restore power supply to the secondary safety chain circuit, thereby resetting the secondary safety chain.

[0064] When the PLC detects that it is working normally, it outputs the PLC OK signal, making the LC OK signal interface 1 / 2 in the on state. In addition, since when the primary safety chain is in the on state, the first normally closed contact 13 / 14 of the safety chain relay KA1 and the second normally closed contact 23 / 24 of the safety chain relay KA1 are both closed, the PLC detects that the normally open contact of the safety chain relay KA1 is closed, which means that the primary safety chain is in the on state.

[0065] The PLC mentioned in the embodiments of the present application may include components such as a memory, an input unit, a display unit, and a processor.

[0066] In the PLC, the input unit can be used to receive input signals. Specifically, the input unit may include a touch screen and / or other input devices. The touch screen can collect the user's touch operations on or near it (such as the user's operation on or near the touch screen using any suitable object such as fingers, joints, stylus, etc.), and drive the corresponding connection device according to a pre-set program. The touch screen can detect the user's touch action on the touch screen, convert the touch action into a touch signal and send it to the processor, and can receive and execute the command sent by the processor; the touch signal at least includes contact point coordinate information. The touch screen can provide an input interface and an output interface between the PLC and the user. In addition, the touch screen can be implemented using multiple types such as resistive, capacitive, infrared and surface acoustic waves. In addition to the touch screen, the input unit can also include other input devices. Specifically, other input devices can include but are not limited to one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, etc.

[0067] In the PLC, the display unit may be used to display information input by a user or information provided to a user, an interactive interface, file display, and / or playback of any multimedia file.

[0068] In the PLC, the memory can be used to store instructions and data. The memory can mainly include an instruction storage area and a data storage area. The data storage area can store various data, such as multimedia files, texts, etc.; the instruction storage area can store software units such as operating systems, applications, instructions required for at least one function, or their subsets and extensions. It can also include non-volatile random access memory; provide the processor with hardware, software and data resources including management computing and processing equipment, and support control software and applications. It is also used for the storage of multimedia files, as well as the storage of running programs and applications. The memory can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0069] In the PLC, the processor is the control center of the PLC. It performs various functions of the PLC and processes data by running or executing instructions stored in the memory and calling data stored in the memory, thereby controlling the terminal equipment as a whole.

[0070] Optionally, the processor may include one or more processing units; preferably, the processor may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor. In some embodiments, the processor and the memory may be implemented on a single chip, and in some embodiments, they may also be implemented separately on separate chips. The processor may also be used to generate corresponding operation control signals, send them to corresponding components of the computing and processing device, read and process data in the software, especially read and process data and programs in the memory, so that each functional module therein performs corresponding functions, thereby controlling the corresponding components to act according to the requirements of the instructions.

[0071] In addition, an embodiment of the present application further discloses a control system for a wind turbine generator set, including: any wind turbine safety chain disclosed above.

[0072] In addition, an embodiment of the present application further discloses a wind turbine generator set, including: a control system of any wind turbine generator set disclosed above.

[0073] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the control system and wind turbine generator set disclosed in the embodiment, since they are obtained based on the wind turbine safety chain disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the wind turbine safety chain.

[0074] 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 embodiments of the present invention. Therefore, the embodiments of the present invention will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A wind turbine safety chain, characterized in that: include: A primary safety chain and a secondary safety chain, wherein the secondary safety chain includes a twist cable switch SN1, a relay K2 and a relay K3; The coil of the relay K2 is connected in series with the twist cable switch SN1; the twist cable switch SN1 is disconnected when the twist of the cable exceeds the maximum permissible twist limit; The normally open contact of relay K2 is connected in series with the coil of relay K3; The normally open contact of relay K3 is connected in series in the yaw enabling circuit.

2. The wind turbine safety chain according to claim 1, characterized in that: Relay K3 has at least three normally open contacts in the yaw enable circuit: The first normally open contact of relay K3 is connected in series with the coil of the unit clockwise yaw relay K5; The second normally open contact of relay K3 is connected in series with the coil of counterclockwise yaw relay K4; The third normally open contact of relay K3 is connected in series with the coil of yaw brake relay K6; The normally open contact of the unit clockwise yaw relay K5 is connected in series to the unit clockwise yaw control circuit; The normally open contact of the counterclockwise yaw relay K4 is connected in series to the counterclockwise yaw control circuit of the unit; The normally open contact of the yaw brake relay K6 is connected in series in the yaw brake control circuit.

3. The wind turbine safety chain according to claim 1, characterized in that: The first-level safety chain is connected in series with a normally open contact of a safety chain relay KA1. When any node on the first-level safety chain is disconnected, the first-level safety chain is powered off; The secondary safety chain is connected in series with the normally open contact of the safety chain relay KA1, the normal signal interface of the controller, the coil of the safety chain control relay K1 and the first normally open contact of the safety chain control relay K1. When any node on the secondary safety chain is disconnected, the secondary safety chain is powered off; On the secondary safety chain, the first normally open contact of the safety chain control relay K1, the safety chain reset switch SB3E and the software reset safety chain interface RF are connected in parallel; Among them, the safety chain reset switch SB3E is a manual switch, and the software reset safety chain interface RF is used to turn on or off under the control of the controller.

4. A control system for a wind turbine generator set, characterized in that: include: A wind turbine safety chain as claimed in claim 1, 2 or 3.

5. A wind turbine generator set, characterized in that: include: The control system of a wind turbine generator set as claimed in claim 4.

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