Signal interlock circuit for wind power control cabinet

Abstract

The utility model discloses a signal interlock circuit for wind power control cabinet, including communication module and control module electricity is connected to obtain the monitoring information of external SCADA system and sends to control module, photoelectric coupler includes two photoelectric couplers, respectively electricity is connected control module to input to control module after converting optical signal into electric signal, control module adopts singlechip, and the coil of singlechip electricity is connected double contact relay to send control signal to double contact relay, and the normally closed contact of double contact relay electricity is connected motor control loop to start or close motor control loop. The utility model discloses " double contact + photoelectric isolation " promotes the anti -failure ability, and simultaneously can adjust the control signal of motor according to the monitoring working condition information of external system, ensures the reliability of signal blocking.

Description

Technical Field

[0001] This utility model proposes an interlock circuit, and more particularly a signal interlock circuit for wind power control cabinets. Background Technology

[0002] In the wind power sector, signal interlocking systems for control cabinets and distribution cabinets are crucial for ensuring the safe operation of equipment. Especially in the coordination of wind turbine pitch and yaw systems, interlocking mechanisms prevent simultaneous operation of both, thus preventing potential equipment damage or safety accidents. However, existing interlocking technologies have some significant drawbacks, which severely impact system reliability and efficiency.

[0003] Existing hardware technologies suffer from insufficient reliability, relying primarily on easily failed single-contact relays. In the high-humidity environments common in wind farms, relay contacts are prone to oxidation and adhesion, leading to an interlock failure rate as high as 8% annually. This has already caused numerous incidents of wind turbine pitch control malfunctions. Furthermore, existing interlock logic is fixed and cannot adapt to dynamically changing operating conditions.

[0004] In summary, existing signal interlocking technologies in the wind power sector have significant shortcomings in hardware reliability and logical flexibility. These issues not only affect the safe operation of wind power equipment but also increase maintenance costs and downtime. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a signal interlock circuit for wind power control cabinet.

[0006] To achieve the above objectives, the signal interlock circuit for a wind power control cabinet of this utility model includes two optocouplers, a communication module, a control module, two double-contact relays, and control circuits for the pitch motor and yaw motor; wherein, The communication module is electrically connected to the control module to obtain monitoring information from the external SCADA system and send it to the control module. The two optocouplers are electrically connected to the control module to convert the optical signal into an electrical signal and input it to the control module. The control module uses a microcontroller, which is electrically connected to the coils of the two double-contact relays to send control signals to the two double-contact relays. The dual-contact relay includes a first dual-contact relay and a second dual-contact relay, which are electrically connected to the pitch motor control circuit and the yaw motor control circuit in the motor control circuit, respectively, to start or stop the pitch motor control circuit and the yaw motor control circuit; wherein, the normally open contact of the first dual-contact relay and the normally closed contact of the second dual-contact relay are connected in series to the control circuit of the pitch motor; the normally open contact of the second dual-contact relay and the normally closed contact of the first dual-contact relay are connected in series to the control circuit of the yaw motor.

[0007] Furthermore, the control circuit of the pitch motor includes a normally closed contact of a first thermal relay and a relay coil of a first contactor; wherein, the normally closed contact of the thermal relay, the normally open contact of the first double-contact relay, the normally closed contact of the second double-contact relay, and the coil of the first contactor are connected in series to form a first path. The control circuit of the yaw motor includes a normally closed contact of a second thermal relay and a coil of a second contactor; wherein, the normally closed contact of the thermal relay, the normally open contact of the second double-contact relay, the normally closed contact of the first double-contact relay, and the coil of the second contactor are connected in series to form a second path. The first and second pathways are connected in parallel.

[0008] Furthermore, the optocoupler includes a first optocoupler and a second optocoupler; wherein, the two optocouplers include a first optocoupler and a second optocoupler; wherein, the coil of the first dual-contact relay is connected in series with the first normally open contact of the microcontroller, and then connected in parallel with the first optocoupler at both ends of the first path; the coil of the second dual-contact relay is connected in series with the second normally open contact of the microcontroller, and then connected in parallel with the second optocoupler at both ends of the second path.

[0009] Furthermore, the signal interlock circuit also includes a voltage and current acquisition module. The input terminal of the voltage and current acquisition module is connected to the two ends of the contacts of the first double-contact relay and the second double-contact relay, and the output terminal is connected to the control module, so as to transmit the acquired current and voltage information of the first double-contact relay and the second double-contact relay to the control module. The control module sends early warning information to the external SCADA system through the communication module.

[0010] Furthermore, the voltage and current acquisition module uses the ADS1115 chip, and the interface module uses an SPI interface.

[0011] Furthermore, the communication module supports Modbus-RTU and CANopen protocols.

[0012] This utility model's signal interlock circuit employs a "dual-contact + opto-isolation" design to enhance its resilience against failures. Simultaneously, it can adjust the motor's control signal based on external system monitoring data, ensuring reliable signal interruption. Compared to traditional single-relay interlock circuits, it solves the problems of poor adaptability and low reliability, meeting the high reliability and adaptability safety control requirements of the wind power industry. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the signal interlock circuit for a wind power control cabinet provided by this utility model.

[0014] Figure 2 This is a partial schematic diagram of a signal interlock circuit for a wind power control cabinet, according to an optional embodiment of the present invention. Detailed Implementation

[0015] like Figure 1 As shown, the signal interlock circuit for wind power control cabinet provided by this utility model includes a communication module 11, an optocoupler 12, a control module 13, a double-contact relay 14, and a motor control circuit 15.

[0016] The communication module 11 supports Modbus-RTU and CANopen protocols. It is electrically connected to the control module 13 to obtain monitoring information from the external SCADA system and send it to the control module 13.

[0017] The optocoupler 12 includes two optocouplers, which are electrically connected to the control module 13 respectively, so as to convert the optical signal into an electrical signal and input it to the control module 13.

[0018] The control module 13 uses a microcontroller, which is electrically connected to the coil of the double contact relay 14 to send control signals to the double contact relay 14.

[0019] A dual-contact relay 14 is electrically connected to the motor control circuit 15 to start or stop the motor control circuit 15. The dual-contact relay 14 includes a first dual-contact relay and a second dual-contact relay. The motor control circuit 15 includes a pitch motor control circuit and a yaw motor control circuit. The normally open contact of the first dual-contact relay and the normally closed contact of the second dual-contact relay are connected in series to the pitch motor control circuit to start or stop the pitch motor control circuit. The normally open contact of the second dual-contact relay and the normally closed contact of the first dual-contact relay are connected in series to the yaw motor control circuit to start or stop the yaw motor control circuit.

[0020] In this invention, a dual-contact relay 14 and an optocoupler 12 are used to physically block the signals of the pitch motor and yaw motor, avoiding interlock failure caused by the failure of a single contact. Furthermore, the real-time wind speed monitoring information from the SCADA system can be sent to the microcontroller via the communication module 11. Based on the monitoring information, the microcontroller can control the pitch motor and yaw motor via the dual-contact relay 14 to achieve real-time adjustment of the operating conditions. For example, if the SCADA system raises the real-time wind speed to 15 m / s, it transmits the data to the microcontroller via the communication module 11. The microcontroller then determines the wind speed relative to a set threshold and controls the interlock of the motor control circuit 15 via the dual-contact relay 14.

[0021] In one embodiment of this utility model, the signal interlock circuit further includes a voltage and current acquisition module 16. The input terminal of the voltage and current acquisition module 16 is connected to the normally open and normally closed contacts of the first and second double-contact relays, and the output terminal is electrically connected to a microcontroller via an interface module 17 to transmit the acquired current and voltage information of the first and second double-contact relays to the microcontroller. The microcontroller sends warning information to an external SCADA system via a communication module 11. The microcontroller obtains the judgment result by pre-setting current and voltage thresholds and sends the warning to the SCADA system via the communication module 11. For example, if the contact current is <5mA, it is judged as oxidation; if the line voltage fluctuation is >10%, it is judged as looseness. The SCADA system warns of the relevant fault type, reducing maintenance dependence. Alternatively, after maintenance personnel replace the relay, the microcontroller determines that the contact current has returned to normal, releases the warning, and restores the interlock function of the circuit.

[0022] The voltage and current acquisition module 16 uses an ADS1115 chip, and the output terminal is connected to an SPI interface module 17.

[0023] Figure 2The diagram shows a partial schematic of a signal interlock circuit for a wind power control cabinet according to a specific embodiment of this utility model. The diagram includes the main circuit and control circuit of a pitch motor M1 and a yaw motor M2. The main circuit of the pitch motor M1 includes the main contacts of contactor KM1, the main contacts of thermal relay FR1, and the pitch motor M1 itself, all connected in series. The main circuit of the yaw motor M2 includes the main contacts of contactor KM2, the main contacts of thermal relay FR2, and the yaw motor M2 itself, all connected in series. The main circuits of the pitch motor M1 and the yaw motor M2 are connected to a power supply via a circuit breaker QF1. The control circuit of the pitch motor M1 includes the normally closed contact of the thermal relay FR1 and the coil of the contactor KM1; wherein, the normally closed contact of the thermal relay FR1, the normally open contact of the relay K1, the normally closed contact of the relay K2, and the coil of the contactor KM1 are connected in series to form the first path; the control circuit of the yaw motor M2 includes the normally closed contact of the thermal relay FR2 and the coil of the contactor KM2; wherein, the normally closed contact of the thermal relay FR2, the normally open contact of the relay K2, the normally closed contact of the relay K1, and the coil of the contactor KM2 are connected in series to form the second path; wherein, the first path and the second path are connected in parallel.

[0024] The optocoupler 12 includes a photoelectric switch B1 and a photoelectric switch B2; wherein, the coil of the relay K1 is connected in series with the normally open contact Q1 of the microcontroller and is connected in parallel with the photoelectric switch B1 at both ends of the first path; wherein, the coil of the relay K2 is connected in series with the normally open contact Q2 of the microcontroller and is connected in parallel with the photoelectric switch B2 at both ends of the second path.

[0025] The interlocking process of the above circuit is as follows:

[0026] When photoelectric switch B1 is triggered, the normally open contact Q1 of the microcontroller closes, energizing the coil of relay K1. The normally open contact of relay K1 then closes, energizing the coil of contactor KM1. The main contacts of contactor KM1 close, starting the pitch motor M1. When the normally closed contact of relay K1 opens, the coil of contactor KM2 is de-energized, stopping the yaw motor M2.

[0027] When photoelectric switch B2 is triggered, the normally open contact Q2 of the microcontroller closes, energizing the coil of relay K2. The normally open contact of relay K2 then closes, energizing the coil of contactor KM2. The main contacts of contactor KM2 close, starting the yaw motor M2. When the normally closed contact of relay K2 opens, the coil of contactor KM1 is de-energized, stopping the pitch motor M1.

[0028] Based on the above, this utility model adopts a dual-contact relay 14+ real-time monitoring method. Compared with the traditional single relay interlock circuit, the misoperation rate is reduced from more than 15% to less than 2%, and the interlock response time is shortened from 100ms to 20ms. At the same time, it solves the three major pain points of traditional circuits: "poor adaptability to operating conditions, no early warning of faults, and reliance on manual maintenance", thus meeting the high reliability and high adaptability safety control requirements of the wind power field.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. A signal interlock circuit for a wind power control cabinet, characterized in that, This includes optocouplers, communication modules, control modules, motor control circuits, and two-contact relays; among which, The communication module is electrically connected to the control module to obtain monitoring information from the external SCADA system and send it to the control module. The optocoupler includes two optocouplers, which are electrically connected to the control module respectively, so as to convert the optical signal into an electrical signal and input it to the control module; The control module uses a microcontroller, which is electrically connected to the coil of the dual-contact relay to send control signals to the dual-contact relay. The dual-contact relay is electrically connected to the motor control circuit to start or stop the motor control circuit, and includes a first dual-contact relay and a second dual-contact relay. The motor control circuit includes a pitch motor control circuit and a yaw motor control circuit; wherein, the normally open contact of the first dual-contact relay and the normally closed contact of the second dual-contact relay are connected in series to the pitch motor control circuit to start or stop the pitch motor control circuit; the normally open contact of the second dual-contact relay and the normally closed contact of the first dual-contact relay are connected in series to the yaw motor control circuit to start or stop the yaw motor control circuit.

2. The signal interlock circuit for a wind power control cabinet according to claim 1, characterized in that, The control circuit of the pitch motor includes a normally closed contact of a first thermal relay and a relay coil of a first contactor; wherein, the normally closed contact of the thermal relay, the normally open contact of the first double-contact relay, the normally closed contact of the second double-contact relay and the coil of the first contactor are connected in series to form a first path. The control circuit of the yaw motor includes a normally closed contact of a second thermal relay and a coil of a second contactor; wherein, the normally closed contact of the thermal relay, the normally open contact of the second double-contact relay, the normally closed contact of the first double-contact relay, and the coil of the second contactor are connected in series to form a second path. The first path and the second path are connected in parallel.

3. The signal interlock circuit for a wind power control cabinet according to claim 2, characterized in that, The two optocouplers include a first optocoupler and a second optocoupler; wherein, the coil of the first dual-contact relay is connected in series with the first normally open contact of the microcontroller and then connected in parallel with the first optocoupler at both ends of the first path; the coil of the second dual-contact relay is connected in series with the second normally open contact of the microcontroller and then connected in parallel with the second optocoupler at both ends of the second path.

4. The signal interlock circuit for a wind power control cabinet according to claim 3, characterized in that, The signal interlock circuit further includes a voltage and current acquisition module. The input terminal of the voltage and current acquisition module is connected to the two ends of the contacts of the first double-contact relay and the second double-contact relay, respectively. The output terminal is connected to the control module through an interface module to transmit the acquired current and voltage information of the first double-contact relay and the second double-contact relay to the control module. The control module sends early warning information to the external SCADA system through the communication module.

5. The signal interlock circuit for a wind power control cabinet according to claim 4, characterized in that, The voltage and current acquisition module uses the ADS1115 chip, and the interface module uses an SPI interface.

6. The signal interlock circuit for a wind power control cabinet according to claim 1, characterized in that, The communication module supports Modbus-RTU and CANopen protocols.

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