Electromagnetic brake driving control system and method of wind power paddle

Abstract

The electromagnetic brake driving control system comprises a wind power paddle driving module, an electromagnetic brake driving module connected with the wind power paddle driving module and a self-checking control module used for detecting the electromagnetic brake driving module, the self-checking control module is connected with a relay, and the relay is connected with the electromagnetic brake driving module. The system comprises a DC-DC switch detection control circuit used for carrying out fault self-detection and control on an electromagnetic brake driver, so as to cope with the working state of a frequent switch and synchronously carry out self-detection on an electronic controller, and the fault condition of the electronic controller in a unit can be quickly and accurately identified during frequent pitch change; adjustment can be carried out according to the fault condition, a mechanical relay safety protection loop is triggered under the condition that an electronic relay fails, it is guaranteed that blades stop at the safety position, it is guaranteed that a cog belt is not snapped, and the safety of a unit is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power drive technology, and in particular to an electromagnetic brake drive control system for a wind power blade and a control method thereof. Background Art

[0002] Since wind turbine blades change pitch frequently, pitch failures are mostly caused by electromagnetic brakes. The pitch drive and electromagnetic brake drive are individually controlled by a mechanical relay. Although there are three contacts inside the relay, any disconnection will cause the circuit to lose power. However, as the unit runs for a long time, the relay contacts will oxidize, which can easily lead to insensitive electromagnetic brake action. Electronic and mechanical redundant protection designs are also used.

[0003] However, the current electronic and mechanical redundant protection designs, on the one hand, use mechanical as the main controller, and the contacts of its mechanical relays are prone to oxidation and cause failures, and on the other hand, use electronic as the main controller, which is driven by a DC-DC power module. When the pitch is frequently changed, the switching times of the electronic transistors are also subject to great tests. At the same time, the internal heat dissipation and electrical components of the DC-DC power module in the packaging mode are prone to cause failures of the electronic electromagnetic brake driver. Therefore, there is still room for further optimization of the electromagnetic brake drive control system for wind turbine blades with the current electronic and mechanical redundant protection design. To this end, we propose an electromagnetic brake drive control system for wind turbine blades with self-checking and adjustment functions and a method thereof. Summary of the invention

[0004] In view of the above problems existing in the existing variable pitch drive, the present invention is proposed.

[0005] Therefore, one of the objects of the present invention is to provide an electromagnetic brake drive control system and method for wind turbine blades, which designs an electromagnetic brake driver module and a self-checking control system, with the aim of improving the reliability of the brake circuit of the wind turbine variable pitch system by adding electromagnetic brake drivers, related redundant relays and self-checking control systems.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: On the one hand, the present invention provides an electromagnetic brake drive control system for a wind turbine blade, comprising a wind turbine blade drive module, an electromagnetic brake drive module connected to the wind turbine blade drive module, and a self-check control module for detecting the electromagnetic brake drive module, wherein the electromagnetic brake drive module comprises an electromagnetic brake driver connected in series with the wind turbine blade drive module, and a relay connected in series with the electromagnetic brake driver; The self-check control module is connected to the relay, and includes a DC-DC switch detection control circuit for performing fault self-check and control on the electromagnetic brake driver.

[0007] As a preferred solution of the present invention, wherein: the electromagnetic brake driver is used to cope with the working state of frequent switching of the wind turbine blade drive module, and the electromagnetic brake driver is set as the main working device for controlling the wind turbine blade drive module; the relay is used for forced manual control under the safety emergency state of the wind turbine blade, and the relay is set as an auxiliary working device of the mechanical relay.

[0008] As a preferred solution of the present invention, the DC-DC switch detection control circuit performs fault self-detection and control, specifically, the DC-DC switch detection control circuit determines whether the current state is a safety emergency state, and the safety emergency state is set to trigger a mechanical relay in the event of a fault in the electromagnetic brake driver to perform a safety protection circuit; The fault conditions include: damage to the switching transistor of the electromagnetic brake driver, undervoltage, large fluctuations and high temperature in the switching power supply circuit.

[0009] As a preferred solution of the present invention, the mechanical relay includes a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, the output end of the forced manual switch K2 is connected to the input end of the electromagnetic brake driver, and the input end of the forced manual switch K2 is connected to the power supply circuit.

[0010] As a preferred solution of the present invention, wherein: the DC-DC switch detection control circuit comprises: a relay power supply circuit, a voltage detection circuit and an execution circuit; The relay power supply circuit includes a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; the Vin end of the DC voltage stabilizing chip is connected to the positive electrode of the power supply circuit, the first end of the capacitor C1 is connected to the Vin end of the DC voltage stabilizing chip, the second end of the capacitor C1 is connected to the Gn end of the DC voltage stabilizing chip and the negative electrode of the power supply circuit, the first end of the capacitor C2 is connected to the Feedback end of the DC voltage stabilizing chip, the second end of the capacitor C2 is connected to the Gn end of the DC voltage stabilizing chip and is grounded, the negative electrode of the diode D1 is connected to the Out end of the DC voltage stabilizing chip, the positive electrode of the diode D1 is connected to the Gn end of the DC voltage stabilizing chip, the input end of the inductor L1 is connected to the Out end of the DC voltage stabilizing chip, and the output end of the inductor L1 is connected to the first end of the capacitor C2 and the execution circuit; The voltage detection circuit includes a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the positive electrode of the power supply circuit, the Gn end of the voltage detection chip is connected to the first end of the resistor R2, and the Gn end of the voltage detection chip is connected to the negative electrode of the power supply circuit, and the second end of the resistor R2 is connected to the resistor R1; The execution circuit is connected in series with the K3 relay and the K4 relay, and the execution circuit includes an NMOS tube; the gate of the NMOS tube is connected to the Out terminal of the voltage detection chip, and the source of the NMOS tube is connected to the Gn terminal of the voltage detection chip, and the drain of the NMOS tube is connected to the output terminal of the inductor L1.

[0011] As a preferred solution of the present invention, the electromagnetic brake driver also includes a blade drive output chip and a control input chip, the positive and negative output terminals of the blade drive output chip are connected to the positive and negative input terminals of the motor in the wind turbine blade drive module, the Vcc terminal of the control input chip is connected to an external PLC control system, and the Vcc terminal of the control input chip is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the power supply circuit.

[0012] As a preferred solution of the present invention, wherein: the resistor R1 and the resistor R2 are voltage-dividing resistors, and the resistance values ​​of the resistor R1 and the resistor R2 are set to 3k ohms and 1k ohms respectively, the internal voltage of the voltage detection circuit is set to 5V, and the fluctuation threshold of the input voltage is set to less than 2.5%.

[0013] In one aspect, the present invention provides a control method for an electromagnetic brake drive control system of a wind turbine blade, comprising: Under the condition that the electromagnetic brake driver is working normally, when the blade needs to change pitch, the pitch control signal received by the control input chip is used to give a brake release signal, the electromagnetic brake driver is controlled by the K3 relay and K4 relay of the execution circuit, and the blade drive output chip outputs a control signal to the blade, and the blade of the wind turbine blade drive module starts to change pitch. Similarly, when the blade needs to stop, the stop action control signal received by the control input chip is used to give a blade stop signal and control, and the mechanical relay is not put into use; At the same time, the self-check control module in the electromagnetic brake driver works synchronously, and the voltage detection circuit in the DC-DC switch detection control circuit detects the voltage of the electromagnetic brake driver when it is working normally in real time. When the voltage undervoltage drops to the threshold or the voltage fluctuation is greater than the threshold, the voltage detection chip changes from high-level output to low-level output to determine that the electromagnetic brake driver has a fault. At this time, the relay in the execution circuit is powered on through the relay power supply circuit, and the blade stops the pitch change signal and controls it. When the relay loses power, the K3 relay circuit and the K4 relay circuit are disconnected at the same time to ensure that the internal safety chain of the pitch change is disconnected and the fault is reported. At the same time, the safety emergency state of the wind turbine blade is started, so that the blade cannot perform the pitch change action; In the safety emergency state of the wind turbine blades, when the blades need to change pitch, the electromagnetic brake driver cannot control the pitch motor brake and the motor is in a stalled state. At this time, the on-site operation and maintenance personnel control the forced manual switch K2 of the mechanical relay, which triggers the mechanical relay safety protection circuit and reminds the on-site operation and maintenance personnel of the pitch failure. The on-site operation and maintenance personnel can replace it in time.

[0014] The beneficial effects of the present invention are as follows: the electromagnetic brake driver control scheme of the present invention adopts a composite scheme of an electronic controller and a mechanical relay, wherein the electronic controller is used as the main working device to cope with the working state of frequent switching and synchronously perform self-inspection on the electronic controller. During frequent pitch changes, the fault condition of the electronic controller in the unit can be quickly and accurately identified, and adjustments can be made according to the fault condition, that is, the safety emergency state of the wind turbine blades is started to prevent the blades from changing pitch, so as to remind the operation and maintenance personnel to replace them in time; and the mechanical relay is used as a protective relay for safety emergencies as a safety protection channel. When the electronic relay fails, the mechanical relay safety protection circuit is triggered to ensure that the blades stop in a safe position, the toothed belt is not broken, and the safety of the unit is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the modular structure of the electromagnetic brake drive control system of the present invention; Figure 2 It is a schematic diagram of the modular structure of the DC-DC switch detection control circuit of the present invention; Figure 3 A circuit diagram of the electromagnetic brake drive control system of the present invention; Figure 4is a circuit diagram of a mechanical relay of the present invention; Numbers in the figure: 10, fan blade drive module; 20, electromagnetic brake drive module; 30, self-test module; 301, relay power supply circuit; 302, voltage detection circuit; 303, execution circuit. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0017] Embodiment 1

[0018] Reference Figure 1 and Figure 4 , is an embodiment of the present invention, which provides an electromagnetic brake drive control system for a wind turbine blade, comprising a wind turbine blade drive module 10, an electromagnetic brake drive module 20 connected to the wind turbine blade drive module 10, and a self-test control module 30 for detecting the electromagnetic brake drive module 20, wherein the electromagnetic brake drive module 20 comprises an electromagnetic brake driver connected in series with the wind turbine blade drive module 10, and a relay connected in series with the electromagnetic brake driver; the self-test control module 30 is connected to the relay, and comprises a DC-DC switch detection control circuit for performing fault self-test and control on the electromagnetic brake driver.

[0019] In one embodiment, the electromagnetic brake driver is preferably used to cope with the frequent switching working state of the wind turbine blade drive module 10, and the electromagnetic brake driver is set as the main working device for controlling the wind turbine blade drive module 10; the relay is used for forced manual control under the safety emergency state of the wind turbine blade, and the relay is set as an auxiliary working device of the mechanical relay.

[0020] In one embodiment, the mechanical relay specifically includes a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, the output end of the forced manual switch K2 is connected to the input end of the electromagnetic brake driver, and the input end of the forced manual switch K2 is connected to the power supply circuit.

[0021] This embodiment provides an electromagnetic brake driver control solution using an electronic controller plus a mechanical relay composite solution. The electronic controller is used as the main working device to cope with the working state of frequent switching; and the mechanical relay is used as a protective relay for safety emergencies as a safety protection channel. In the event of failure of the electronic relay, the mechanical relay safety protection circuit is triggered to ensure that the blades stop at a safe position, the toothed belt is not broken, and the unit is safe.

[0022] Embodiment 2

[0023] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , is an embodiment of the present invention, which provides an electromagnetic brake drive control system for wind turbine blades. This embodiment adds a self-check module 30 for synchronously performing self-check control on the electronic controller on the basis of the electronic controller plus mechanical relay composite solution of the first embodiment.

[0024] In the second embodiment, the mechanical relay is triggered in the case of a fault in the electromagnetic brake driver in the first embodiment to perform a safety protection circuit. The fault conditions include: damage to the switch transistor of the electromagnetic brake driver, undervoltage, large fluctuation and high temperature of the switch power supply circuit.

[0025] The DC-DC switch detection control circuit performs fault self-detection and control, specifically, determines whether the current status is a safety emergency state through the DC-DC switch detection control circuit. The safety emergency state is set to trigger a mechanical relay when the electromagnetic brake driver fails to perform a safety protection circuit; the fault conditions include: damage to the switch transistor of the electromagnetic brake driver, undervoltage, large fluctuation and high temperature of the switch power supply circuit.

[0026] In a second embodiment, the DC-DC switch detection control circuit includes: a relay power supply circuit, a voltage detection circuit and an execution circuit; The relay power supply circuit includes a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; the Vin end of the DC voltage stabilizing chip is connected to the positive electrode of the power supply circuit, the first end of the capacitor C1 is connected to the Vin end of the DC voltage stabilizing chip, the second end of the capacitor C1 is connected to the Gn end of the DC voltage stabilizing chip and the negative electrode of the power supply circuit, the first end of the capacitor C2 is connected to the Feedback end of the DC voltage stabilizing chip, the second end of the capacitor C2 is connected to the Gn end of the DC voltage stabilizing chip and is grounded, the negative electrode of the diode D1 is connected to the Out end of the DC voltage stabilizing chip, the positive electrode of the diode D1 is connected to the Gn end of the DC voltage stabilizing chip, the input end of the inductor L1 is connected to the Out end of the DC voltage stabilizing chip, and the output end of the inductor L1 is connected to the first end of the capacitor C2 and the execution circuit; The voltage detection circuit includes a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the positive electrode of the power supply circuit, the Gn end of the voltage detection chip is connected to the first end of the resistor R2, and the Gn end of the voltage detection chip is connected to the negative electrode of the power supply circuit, and the second end of the resistor R2 is connected to the resistor R1; The execution circuit is connected in series with the K3 relay and the K4 relay, and the execution circuit includes an NMOS tube; the gate of the NMOS tube is connected to the Out end of the voltage detection chip, the source of the NMOS tube is connected to the Gn end of the voltage detection chip, and the drain of the NMOS tube is connected to the output end of the inductor L1.

[0027] In a second embodiment, the electromagnetic brake driver also includes a blade drive output chip and a control input chip, the positive and negative output terminals of the blade drive output chip are connected to the positive and negative input terminals of the motor in the wind turbine blade drive module, the Vcc terminal of the control input chip is connected to an external PLC control system, and the Vcc terminal of the control input chip is connected to the cathode of diode D2, and the anode of diode D2 is connected to the power supply circuit.

[0028] In the second embodiment, it should be emphasized that the resistor R1 and the resistor R2 are voltage divider resistors, and the resistance values ​​of the resistor R1 and the resistor R2 are set to 3k ohms and 1k ohms respectively, the internal voltage of the voltage detection circuit is set to 5V, and the fluctuation threshold of the input voltage is set to less than 2.5%. Figure 3 As shown in the figure, when the relay loses power, the K3 circuit and the K4 circuit are disconnected at the same time, which can not only ensure the disconnection of the internal safety chain of the pitch control and report the fault, but also lock AC2 so that the blade cannot perform the pitch control action. If a relay with multiple contacts is selected, different circuits can be connected to achieve different functions; the closing and opening of the relay are controlled by the transistor in the circuit.

[0029] The DC-DC switch detection control circuit of the present embodiment performs fault self-checking and control, which is powered by the relay power supply circuit, the voltage detection circuit performs real-time voltage detection and execution circuit control, and then performs self-check on the working state of the frequent switch and the electronic controller synchronously, and can quickly and accurately identify the fault condition of the electronic controller in the unit during frequent pitch changes, and can make adjustments according to the fault condition, that is, start the safety emergency state of the wind turbine blades, so that the blades cannot change pitch, so as to remind the operation and maintenance personnel to replace them in time. It can not only self-check and identify the fault state in time, but also ensure the safety of the unit after starting the safety state in time, and further improve the stability and reliability of the blade operation at this stage.

[0030] Embodiment 3

[0031] This embodiment provides a control method for an electromagnetic brake drive control system of a wind turbine blade, which is applied to the triggering mechanical relay safety protection circuit and the synchronous self-checking safety control function of the above two embodiments, and includes: Under the condition that the electromagnetic brake driver is working normally, when the blade needs to change pitch, the pitch control signal received by the control input chip is used to give a brake release signal, the electromagnetic brake driver is controlled by the K3 relay and K4 relay of the execution circuit, and the blade drive output chip outputs a control signal to the blade, and the blade of the wind turbine blade drive module starts to change pitch. Similarly, when the blade needs to stop, the stop action control signal received by the control input chip is used to give a blade stop signal and control, and the mechanical relay is not put into use; At the same time, the self-check control module in the electromagnetic brake driver works synchronously, and the voltage detection circuit in the DC-DC switch detection control circuit detects the voltage of the electromagnetic brake driver when it is working normally in real time. When the voltage undervoltage drops to the threshold or the voltage fluctuation is greater than the threshold, the voltage detection chip changes from high-level output to low-level output to determine that the electromagnetic brake driver has a fault. At this time, the relay in the execution circuit is powered on through the relay power supply circuit, and the blade stops the pitch change signal and controls it. When the relay loses power, the K3 relay circuit and the K4 relay circuit are disconnected at the same time to ensure that the internal safety chain of the pitch change is disconnected and the fault is reported. At the same time, the safety emergency state of the wind turbine blade is started, so that the blade cannot perform the pitch change action; In the safety emergency state of the wind turbine blades, when the blades need to change pitch, the electromagnetic brake driver cannot control the pitch motor brake and the motor is in a stalled state. At this time, the on-site operation and maintenance personnel control the forced manual switch K2 of the mechanical relay, which triggers the mechanical relay safety protection circuit and reminds the on-site operation and maintenance personnel of the pitch failure. The on-site operation and maintenance personnel can replace it in time.

[0032] Based on the above embodiments, it can be known that the electromagnetic brake driver control scheme of the present invention adopts a composite scheme of an electronic controller and a mechanical relay, wherein the electronic controller is used as the main working device to cope with the working state of frequent switching and synchronously perform self-inspection on the electronic controller. During frequent pitch changes, the fault condition of the electronic controller in the unit can be quickly and accurately identified, and adjustments can be made according to the fault condition, that is, the safety emergency state of the wind turbine blades is started to prevent the blades from changing pitch, so as to remind the operation and maintenance personnel to replace them in time; and the mechanical relay is used as a protective relay for safety emergencies as a safety protection channel. When the electronic relay fails, the mechanical relay safety protection circuit is triggered to ensure that the blades stop in a safe position, the toothed belt is not broken, and the safety of the unit is ensured.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electromagnetic brake drive control system for a wind turbine blade, characterized in that: It includes a wind turbine blade drive module, an electromagnetic brake drive module connected to the wind turbine blade drive module, and a self-checking control module for detecting the electromagnetic brake drive module, wherein the electromagnetic brake drive module includes an electromagnetic brake driver connected in series with the wind turbine blade drive module, and a relay connected in series with the electromagnetic brake driver; The self-check control module is connected to the relay, and includes a DC-DC switch detection control circuit for performing fault self-check and control on the electromagnetic brake driver.

2. The electromagnetic brake drive control system for wind turbine blades according to claim 1, characterized in that: The electromagnetic brake driver is used to deal with the working state of frequent switching of the wind turbine blade drive module, and the electromagnetic brake driver is set as the main working device to control the wind turbine blade drive module; the relay is used for forced manual control of the wind turbine blade in a safety emergency state, and the relay is set as an auxiliary working device of the mechanical relay.

3. The electromagnetic brake drive control system for wind turbine blades according to claim 1, characterized in that: The DC-DC switch detection control circuit performs fault self-detection and control, specifically, the DC-DC switch detection control circuit determines whether the current state is a safety emergency state, and the safety emergency state is set to trigger a mechanical relay in the event of a fault in the electromagnetic brake driver to perform a safety protection circuit; The fault conditions include: damage to the switching transistor of the electromagnetic brake driver, undervoltage, large fluctuations and high temperature in the switching power supply circuit.

4. The electromagnetic brake drive control system for wind turbine blades according to claim 2, characterized in that: The mechanical relay includes a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, the output end of the forced manual switch K2 is connected to the input end of the electromagnetic brake driver, and the input end of the forced manual switch K2 is connected to the power supply circuit.

5. The electromagnetic brake drive control system for wind turbine blades according to claim 3, characterized in that: The DC-DC switch detection control circuit comprises: a relay power supply circuit, a voltage detection circuit and an execution circuit; The relay power supply circuit includes a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; the Vin end of the DC voltage stabilizing chip is connected to the positive electrode of the power supply circuit, the first end of the capacitor C1 is connected to the Vin end of the DC voltage stabilizing chip, the second end of the capacitor C1 is connected to the Gn end of the DC voltage stabilizing chip and the negative electrode of the power supply circuit, the first end of the capacitor C2 is connected to the Feedback end of the DC voltage stabilizing chip, the second end of the capacitor C2 is connected to the Gn end of the DC voltage stabilizing chip and is grounded, the negative electrode of the diode D1 is connected to the Out end of the DC voltage stabilizing chip, the positive electrode of the diode D1 is connected to the Gn end of the DC voltage stabilizing chip, the input end of the inductor L1 is connected to the Out end of the DC voltage stabilizing chip, and the output end of the inductor L1 is connected to the first end of the capacitor C2 and the execution circuit; The voltage detection circuit includes a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the positive electrode of the power supply circuit, the Gn end of the voltage detection chip is connected to the first end of the resistor R2, and the Gn end of the voltage detection chip is connected to the negative electrode of the power supply circuit, and the second end of the resistor R2 is connected to the resistor R1; The execution circuit is connected in series with the K3 relay and the K4 relay, and the execution circuit includes an NMOS tube; the gate of the NMOS tube is connected to the Out terminal of the voltage detection chip, and the source of the NMOS tube is connected to the Gn terminal of the voltage detection chip, and the drain of the NMOS tube is connected to the output terminal of the inductor L1.

6. The electromagnetic brake drive control system for wind turbine blades according to claim 5, characterized in that: The electromagnetic brake driver also includes a blade drive output chip and a control input chip. The positive and negative output terminals of the blade drive output chip are connected to the positive and negative input terminals of the motor in the wind turbine blade drive module. The Vcc terminal of the control input chip is connected to an external PLC control system, and the Vcc terminal of the control input chip is connected to the cathode of the diode D2. The anode of the diode D2 is connected to the power supply circuit.

7. The electromagnetic brake drive control system for wind turbine blades according to claim 5, characterized in that: The resistor R1 and the resistor R2 are voltage-dividing resistors, and the resistance values ​​of the resistor R1 and the resistor R2 are set to 3k ohms and 1k ohms respectively. The internal voltage of the voltage detection circuit is set to 5V, and the fluctuation threshold of the input voltage is set to be less than 2.5%.

8. The control method of the electromagnetic brake drive control system of a wind turbine blade according to claim 1, characterized in that: include: Under the condition that the electromagnetic brake driver is working normally, when the blade needs to change pitch, the pitch control signal received by the control input chip is used to give a brake release signal, the electromagnetic brake driver is controlled by the K3 relay and K4 relay of the execution circuit, and the blade drive output chip outputs a control signal to the blade, and the blade of the wind turbine blade drive module starts to change pitch. Similarly, when the blade needs to stop, the stop action control signal received by the control input chip is used to give a blade stop signal and control, and the mechanical relay is not put into use; At the same time, the self-check control module in the electromagnetic brake driver works synchronously, and the voltage detection circuit in the DC-DC switch detection control circuit detects the voltage of the electromagnetic brake driver when it is working normally in real time. When the voltage undervoltage drops to the threshold or the voltage fluctuation is greater than the threshold, the voltage detection chip changes from high-level output to low-level output to determine that the electromagnetic brake driver has a fault. At this time, the relay in the execution circuit is powered on through the relay power supply circuit, and the blade stops the pitch change signal and controls it. When the relay loses power, the K3 relay circuit and the K4 relay circuit are disconnected at the same time to ensure that the internal safety chain of the pitch change is disconnected and the fault is reported. At the same time, the safety emergency state of the wind turbine blade is started, so that the blade cannot perform the pitch change action; In the safety emergency state of the wind turbine blades, when the blades need to change pitch, the electromagnetic brake driver cannot control the pitch motor brake and the motor is in a stalled state. At this time, the on-site operation and maintenance personnel control the forced manual switch K2 of the mechanical relay, which triggers the mechanical relay safety protection circuit and reminds the on-site operation and maintenance personnel of the pitch failure. The on-site operation and maintenance personnel can replace it in time.

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