Control system of remote control ice melting short circuit switch of wind power current collection circuit

Abstract

The invention discloses a control system of a remote-control ice-melting short-circuit switch of a wind power current collection line, relates to the technical field of disaster prevention and reduction of a power system, and designs an effective control system on the basis of a mechanical structure of the ice-melting short-circuit switch to realize remote signaling, remote measurement and remote control functions and video monitoring of the state of a high-voltage isolation switch. Normal and stable operation of the ice melting equipment is ensured, and the ice melting efficiency of the wind power plant current collection line is practically improved; the control system is high in reliability, high in intelligent degree, capable of achieving quick and convenient ice melting of the current collection line and preventing switch live-line electric misoperation and live-line manual misoperation, extremely high in safety and suitable for large-area application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of disaster prevention and reduction of electric power systems, and in particular to a control system for a remote-controlled ice-melting short-circuit switch of a wind power collection line. Background Art

[0002] The wind farm is located in a high-altitude micro-topography area. The cold air in winter causes severe ice on the wind turbines, transmission lines, and overhead collector lines, which eventually leads to large-scale disconnection from the grid. In order to reduce ice disasters, an ice-melting short-circuit switch needs to be installed at the end of the 35kV collector line to cooperate with the ice-melting system to achieve line ice melting. The existing ice-melting short-circuit switch is manually operated. When different collector lines are iced, operators need to short-circuit on different hills several kilometers away. After the road is frozen, the mountain road is difficult to travel, and the on-site short-circuit is difficult, dangerous, and inefficient. Conventional controllers have the risk of malfunctioning and causing power outages in the collector line, while conventional live interlock relays have problems such as coil heating caused by long-term energized interlocking state, circuit failure caused by mechanical fatigue, and functional failure. Conventional isolating switches are prone to ice and ice in winter, which makes it easy for the switch to fail to automatically open and close, thereby causing damage to the switch.

[0003] Patent application No. 202411034738X, named as a closed high-voltage ice-melting switch device, discloses an improved device for the existing ice-melting short-circuit switch, designs a closed cabinet, sets independent high-voltage chamber and low-voltage chamber in the closed cabinet, sets high-voltage disconnector, high-voltage mutual inductor and first lightning arrester in the high-voltage chamber, sets second lightning arrester and integrated control box in the low-voltage chamber, and sets temperature and humidity controller and video monitoring element in the closed cabinet to obtain the temperature and humidity conditions in the cabinet and the opening and closing state images of the high-voltage disconnector. Its control method is that when the transmission line is ice-melting, the ice-melting line is powered off to confirm that the external cable is not energized; the high-voltage disconnector is closed, and after confirming that the high-voltage disconnector is closed in place through the video monitoring element, the ice-melting line is connected to melt the ice; after the ice-melting is completed, the ice-melting line is powered off to confirm that the external cable is not energized; the high-voltage disconnector is opened, and the high-voltage disconnector is opened in place through the video monitoring element to form a visible fracture. This patent application realizes the protection of high-voltage disconnectors, lightning protection measures, temperature and humidity control, and confirmation of the opening and closing status of high-voltage disconnectors, which can effectively prevent ice melting equipment from freezing in low-temperature and snowy seasons, ensure the normal operation of ice melting equipment, and improve the stability of the power system. The equipment can realize remote control, display the high-voltage live status of external cables in real time, protect the safety of on-site personnel, and transmit signals to the background to monitor the live status of the lines in real time, effectively preventing live misoperation.

[0004] However, the patent application only mentions the mechanical structure and does not provide a complete control system solution. The control method process is also briefly mentioned. The problems existing in conventional controllers and conventional energized interlocking relays are not effectively solved, so the problems existing in the current ice-melting short-circuit switches are not fundamentally solved. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a control system for a remote-controlled ice-melting short-circuit switch for a wind power collector line. Based on the mechanical structure of the ice-melting short-circuit switch, an effective control system is designed to realize remote signaling, remote measurement, remote control and video monitoring of the high-voltage disconnector status, thereby ensuring the normal and stable operation of the ice-melting equipment and effectively improving the ice-melting efficiency of the wind farm collector line.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A control system for a remote-controlled ice-melting short-circuit switch for a wind power collector line, wherein the remote-controlled ice-melting short-circuit switch is arranged at the end of a 35kV collector line, and comprises a closed cabinet, wherein an independent high-voltage chamber and a low-voltage chamber are arranged in the closed cabinet, wherein a high-voltage isolating switch, a high-voltage transformer and a lightning protection device are arranged in the high-voltage chamber, and an integrated control box, relevant controlled equipment and a video monitoring device are arranged in the low-voltage chamber, wherein the control system of the remote-controlled ice-melting short-circuit switch comprises a power-taking device, a battery management device, an intelligent control terminal and relevant control equipment, a main line live rejection hardware circuit and relevant equipment of the high-voltage isolating switch, wherein the power-taking device comprises a voltage transformer, a lightning protection device and a secondary EMI filtering circuit connected in sequence; wherein the battery management device comprises a battery charging management module and a lead-acid battery pack connected to each other, wherein the battery charging management module is connected to the secondary EMI filtering circuit; wherein the intelligent control terminal and relevant control equipment comprise an intelligent control terminal and a The temperature and humidity sensor, the heater group with a fan, the ambient temperature sensor, the communication and monitoring device, the voltage detection circuit, the isolation knife motor drive circuit and the electric control lock drive circuit, the two EMI filter circuits are respectively connected to the above-mentioned devices to realize voltage detection and power supply; the main line live rejection hardware circuit is set as a main line live detection circuit independent of the intelligent control terminal, which is arranged between the isolation knife motor drive circuit, the electric control lock drive circuit and the isolation knife motor and the electric control lock coil of the high-voltage isolating switch related equipment to realize the live rejection of the high-voltage isolating switch; the high-voltage isolating switch related equipment also includes a switch state sensor and an electric control lock state sensor, the switch state sensor and the electric control lock state sensor are respectively connected to the intelligent control terminal, the intelligent control terminal is connected to the host computer through the communication line of the communication and monitoring device, and the host computer can monitor the status of multiple ice-melting short-circuit switches at the same time and realize the control of multiple ice-melting short-circuit switches.

[0007] The communication and monitoring device includes two communication modes implemented by optical fiber module and 4G gateway, and is connected to corresponding camera one and camera two. The two independent communication interfaces of the intelligent control terminal are respectively connected to the optical fiber module and the 4G gateway to realize communication and video monitoring between the host computer and the high-voltage disconnector, and observe the opening and closing status of the high-voltage disconnector, whether it is covered with ice, and the indication status of the lightning arrester. The main line live rejection hardware circuit is mainly composed of a battery, a step-down transformer, a rectifier module, a filter circuit, a DC smoothing circuit, a voltage stabilizing circuit, a voltage regulating circuit, a voltage comparison circuit, a relay coil drive circuit, and a live rejection relay. The step-down transformer is connected to the secondary EMI filter circuit to convert the 35KV collector line voltage into a low-voltage AC signal, which is then converted into a DC voltage signal U1 that is basically proportional to the collector line voltage after passing through the rectifier module, filter circuit, and DC smoothing circuit connected in sequence. The battery voltage is converted into an adjustable voltage threshold U0 through the voltage stabilizing circuit and the voltage regulating circuit connected in sequence. The voltage threshold U0 and the DC voltage signal U1 are connected to the voltage comparison circuit. The output end of the voltage comparison circuit is connected to the relay coil drive circuit of the live rejection relay. The normally open contacts of the live rejection relay are respectively connected in series to the positive voltage end of the isolation knife motor drive circuit and the positive voltage end of the electric control lock drive circuit.

[0008] The host computer realizes remote signaling, remote measurement and remote control of the ice-melting short-circuit switch under normal conditions and ice-melting conditions, and can observe the opening and closing status of the high-voltage disconnector, whether it is covered with ice, and the indication information of the lightning protection device. The monitored information includes the opening and closing position information of the switch, the position information of the electric control lock, the primary line voltage, the ambient temperature, the temperature and humidity in the cabinet, the temperature and humidity in the control box, the battery power, and the total number of switch opening and closing actions.

[0009] The control system is provided with an automatic opening and closing action process of the high-voltage disconnector and a fault self-diagnosis program. The specific steps of the automatic closing action process are as follows: Step S11: the background software issues a remote control closing command; Step S12: After receiving the closing command, the intelligent control terminal makes a judgment based on the detected ambient temperature value. When the ambient temperature is higher than the temperature threshold, the system gives an alarm 1 to the background software and the process ends; if the temperature is lower than the temperature threshold, proceed to the next step; Step S13: When the above conditions are met, the intelligent control terminal detects the voltage of the collector line. When it is detected that the line carries a voltage of 35 kV, the system gives an alarm 2 to the background software, and the process ends; if the collector line is not energized, proceed to the next step; Step S14: When the above conditions are met, the intelligent control terminal controls the electric lock coil to open; Step S15: After the intelligent control terminal issues an electric lock opening command, if no electric lock opening signal is received within the set time, the system will give the background software an alarm 3, and the process ends; if the electric lock opening signal is received within the set time and the signal is stable, the next step is entered; Step S16: When the above conditions are met, the intelligent control terminal controls the high-voltage isolating switch to close, and controls the closing signal to turn on the MOS tubes Q3 and Q6 at the diagonal of the H-bridge circuit of the isolating motor drive circuit to drive the isolating motor to start forward; Step S17: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q3 and Q6 of the H-bridge circuit diagonally of the knife-isolating motor drive circuit are turned on, the armature circuit of the knife-isolating motor cannot be turned on, and the knife-isolating motor does not start. At this time, the intelligent control terminal detects that there is no current in the armature circuit of the knife-isolating motor, and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 4, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor is fully turned on, and the knife-isolating motor starts forward, and enters the next step; Step S18: When the knife-isolating motor is started and the intelligent control terminal does not detect the closing signal within the set time threshold, the system gives an alarm 5 to the background software and the process ends; Step S19: When the knife-isolating motor starts and the intelligent control terminal detects the closing signal within the set time threshold, the knife-isolating motor stops at the moment the closing signal is detected, and the next step is entered; Step S110: After the knife-isolating motor stops, the intelligent control terminal sends a closing signal to the backend; Step S111: After the background receives the signal of closing position, the operator can observe the closing status of the ice-melting short-circuit switch through the camera field of view of the background software. When the video confirms that the closing position is in place, the process ends, and the collector line can be energized to melt ice at this time; Among them, the alarm code prompt displayed in the background is: Alarm 1: There is no ice disaster on the collector line, incorrect operation; Alarm 2: The collector circuit is not powered off, and the operation is wrong; Alarm 3: Electric lock failure; voltage detection circuit failure; Alarm 4: Motor drive circuit failure; voltage detection circuit failure; Alarm 5: Switch closing failure.

[0010] The specific steps of the automatic opening action process are as follows: Step S21: the background software issues a remote control tripping command; Step S22: After receiving the opening command, the intelligent control terminal detects the voltage of the collector line. When it is detected that the line carries a voltage of 35kV, the system gives an alarm 6 to the background software, and the process ends; if the collector line is not energized, proceed to the next step; Step S23: When the above conditions are met, the intelligent control terminal 31 controls the electric lock coil to open; Step S24: After the intelligent control terminal issues an electric lock opening command, if no electric lock opening signal is received within the set time, the system will give an alarm 7 to the background software, and the process ends; if the electric lock opening signal is received within the set time and the signal is stable, the next step is entered; Step S25: When the above conditions are met, the intelligent control terminal controls the high-voltage disconnect switch to close, and controls the opening signal to turn on the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the disconnecting motor drive circuit to drive the motor to start in reverse; Step S26: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the knife-isolating motor drive circuit are turned on, the armature circuit of the knife-isolating motor cannot be turned on, and the knife-isolating motor does not start. At this time, the intelligent control terminal detects that there is no current in the armature circuit of the knife-isolating motor, and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 8, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor is turned on, and the knife-isolating motor starts in reverse, and enters the next step; Step S27: When the knife-isolating motor is started and the intelligent control terminal does not detect the opening signal within the set time threshold, the system gives an alarm 9 to the background software and the process ends; Step S28: When the knife-isolating motor is started and the intelligent control terminal 31 detects the closing signal within the set time threshold, the knife-isolating motor stops at the moment the opening signal is detected, and the next step is entered; Step S29: After the knife-isolating motor stops, the intelligent control terminal sends a switch-off signal to the backend; Step S210: After the backend receives the opening signal, the operator can observe the opening status of the ice-melting short-circuit switch through the camera field of view of the backend software. When the video confirms that the opening is in place, the process ends; Among them, the alarm code prompt displayed in the background is: Alarm 6: The collector circuit is not powered off, incorrect operation; Alarm 7: Electric lock failure; Alarm 8: Motor drive circuit fault, voltage detection circuit fault; Alarm 9: Switch opening failure.

[0011] The present invention describes a control system for a remote-controlled de-icing short-circuit switch for a wind power collector line based on a 35KV high-voltage disconnector, which can achieve fast and convenient de-icing of the collector line during icing, and has the following beneficial effects: 1) The closed cabinet protects the high-voltage disconnector. The intelligent control terminal detects the temperature and humidity inside the cabinet and controls the heater and heat exchange fan to ensure that the switch is not covered with ice in winter, thereby ensuring the reliable operation of the switch during ice-covered period; 2) Intelligent control terminal and background control software can realize the remote signaling, remote measurement, remote control and video monitoring functions of the switch status, and realize double confirmation of the switch opening and closing status; 3) Equipped with lead-acid batteries, so that the switches and control system components can operate and run normally in the event of power failure; 4) Set up two independent communication methods to achieve reliable communication and video monitoring between the host computer and the ice melting switch; 5) A hardware live refusal circuit independent of the control system is designed, which not only ensures the live refusal function of the ice melting switch, but also avoids the circuit failure and functional failure caused by coil heating and mechanical fatigue caused by long-term pull-in of conventional latching relays; 6) A multi-stage EMI filter circuit is set at the back end of the lightning protection equipment to attenuate the electromagnetic interference signal, suppress the feedback clutter at the power input end, improve the electromagnetic compatibility of the entire system, and increase the lightning resistance of each device; 7) The control system is highly reliable and intelligent, which can realize fast and convenient ice melting of the collector line, greatly improving the ice melting efficiency, preventing erroneous electric operation of the switch and erroneous manual operation of the switch, and has extremely high safety, suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the control system of the present invention; Figure 2 This is a schematic diagram of the hardware circuit principle of the main line live rejection of the present invention; Figure 3 This is a closing operation flow chart of the ice melting short-circuit switch control system of the present invention; Figure 4 This is a flow chart of the opening operation of the ice-melting short-circuit switch control system of the present invention. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments: like Figure 1As shown, the control system of the remote control ice melting short-circuit switch of the wind power collection line is arranged at the end of the 35KV collection line, and includes a closed cabinet, in which an independent high-voltage chamber and a low-voltage chamber are arranged, and the high-voltage chamber is provided with a high-voltage isolating switch, a high-voltage mutual inductor and a lightning protection device, and the low-voltage chamber is provided with an integrated control box, related controlled equipment and a video monitoring device. The control system of the remote control ice-melting short-circuit switch includes a power supply device 1, a battery management device 2, an intelligent control terminal and related control equipment 3, a main line live rejection hardware circuit 5 and high-voltage isolating switch related equipment 4.

[0014] The power supply device 1 includes a voltage transformer 11, a lightning protection device 12 and a secondary EMI filter circuit 13 which are connected in sequence.

[0015] The battery management device 2 includes a battery charging management module 21 and a lead-acid battery pack 22 that are interconnected. The battery charging management module 21 is connected to a secondary EMI filter circuit 13 , and the battery charging management module 21 is connected to a control and detection system power supply circuit 39 of an intelligent control terminal 31 .

[0016] The intelligent control terminal and related control equipment 3 include an intelligent control terminal 31 and a temperature and humidity sensor 32, a heater group 33 with a fan, an ambient temperature sensor 34, a communication and monitoring device 35, a voltage detection circuit 36, a knife-isolating motor drive circuit 37 and an electric lock drive circuit 38 connected thereto. The two EMI filter circuits 13 are respectively connected to the above-mentioned devices to realize voltage detection and power supply. The temperature and humidity sensor 32 is connected to the intelligent control terminal 31 through control port one 321, the ambient temperature sensor 34 is connected to the intelligent control terminal 31 through control port two 341, and the heater group 33 with a fan is connected to the intelligent control terminal 31 through control port three 331.

[0017] The main line live rejection hardware circuit 5 is configured as a main line live detection circuit independent of the intelligent control terminal 31, and is configured between the knife isolation motor drive circuit 37, the electric control lock drive circuit 38 and the knife isolation motor 41 and the electric control lock coil 42 of the high-voltage disconnector related equipment to achieve live rejection of the high-voltage disconnector.

[0018] The high-voltage isolating switch related equipment 4 also includes a switch status sensor 43 and an electric lock status sensor 44. The switch status sensor 43 and the electric lock status sensor 44 are respectively connected to the intelligent control terminal 31 through the switch input interface 311. The intelligent control terminal 31 is connected to the host computer through the communication line of the communication and monitoring device 35. The host computer can simultaneously monitor the status of multiple ice-melting short-circuit switches and realize the control of multiple ice-melting short-circuit switches.

[0019] In the technical solution of the present invention, in order to realize dust prevention of the ice-melting short-circuit switch and prevent the switch from being opened and closed in place due to ice and icing during winter, a closed cabinet is designed, and a temperature and humidity sensor 32 and a heater group 33 with a fan are set in the closed cabinet. The intelligent control terminal 31 collects temperature and humidity data, and the control program is provided with a low temperature threshold L and a high temperature threshold H. The heater group 33 with a fan is controlled to work according to the temperature and humidity data. When the temperature in the closed cabinet is lower than the low temperature threshold L, the intelligent control terminal 31 controls the heater to heat, and at the same time controls the heater heat exchange fan to pneumatically increase the heating efficiency; after the temperature continues to rise, when the temperature is higher than the low temperature threshold H, the intelligent control terminal 31 controls the heater to stop working, and after a delay (for example, 30 seconds), the heat exchange fan stops working. Such a cycle ensures that the temperature in the closed cabinet is always higher than the low temperature threshold (such as 0°C), prevents the ice-melting short-circuit switch from being covered with ice in winter, and ensures that the switch can be remotely and reliably opened and closed in place during ice melting.

[0020] When the power supply system of the ice-melting short-circuit switch is in the non-ice-melting state, the main line is energized, and the 35KV high voltage of the collector line is converted into 220V AC through the voltage transformer 11, and then converted into 27V DC voltage through rectification, filtering, and voltage stabilization after passing through the lightning protection device 12 and the secondary EMI filter circuit 13, to charge the lead-acid battery pack 22 and maintain the normal operation of the control system. In the ice-melting state, the main line is powered off, and the power supply mode is automatically switched from line power supply to battery power supply. The lead-acid battery pack 22 can provide DC24V and DC12V power supplies to ensure the normal operation of the intelligent control terminal 31, the communication and video monitoring device 35, and the opening and closing actions of the high-voltage isolation switch.

[0021] As a preferred method, in this embodiment, the communication and monitoring device 35 includes two communication methods implemented by using an optical fiber module 351 and a 4G gateway 352, and is connected to the corresponding camera 1 353 and camera 2 354. The two independent communication ports 355 and 356 of the intelligent control terminal 31 are respectively connected to the optical fiber module 351 and the 4G gateway 352 to realize communication and video monitoring between the host computer and the high-voltage disconnector, and observe the opening and closing status of the high-voltage disconnector, whether it is covered with ice, and the indication status of the lightning arrester. Specifically, the intelligent control terminal 31 has two independent communication ports 355 and 356, which are used to connect optical fiber communication and 4G communication components respectively, realize communication and video monitoring between the host computer and the ice melting short-circuit switch, remote control the opening and closing operation of the switch, and avoid the problem of difficult mountain roads under ice disaster conditions. Users can choose the corresponding communication method according to actual conditions. The optical fiber communication method is to connect the optical fiber module 351 between the intelligent control terminal 31 and the camera 1 353. The optical fiber module 351 is connected to the optical fiber network of the wind turbine nearby through optical fiber, and a convergence switch is installed in the booster station. A ring network is formed through the optical fiber channel of the wind farm. The 4G communication method is to connect the 4G gateway 352 between the intelligent control terminal 31 and the camera 2 354, which is relatively simple. The background software can realize the remote signaling, telemetry, and remote control of the ice melting short-circuit switch in normal and ice melting states through these two methods, and can observe the switch opening and closing state and whether it is covered with ice, lightning arrester indication and other states through camera 1 353 or camera 2 354.

[0022] As a preferred method, Figure 2 As shown, in this embodiment, the main line live rejection hardware circuit 5 is mainly composed of a battery 51, a step-down transformer 52, a rectifier module 53, a filter circuit 54, a DC smoothing circuit 55, a voltage stabilizing circuit 56, a voltage regulating circuit 57, a voltage comparison circuit 58, a relay coil drive circuit 59, and a live rejection relay 50. The step-down transformer 52 is connected to the secondary EMI filter circuit 13 to convert the 35KV collector line voltage into a low-voltage AC signal, which is then converted into a DC voltage signal U1 that is substantially proportional to the collector line voltage after being sequentially connected to the rectifier module 53, the filter circuit 54, and the DC smoothing circuit 55. The voltage of the battery 51 is converted into a DC voltage signal U1 that is substantially proportional to the collector line voltage after being sequentially connected to the voltage stabilizing circuit 56 and the voltage regulating circuit 57. It is converted into an adjustable voltage threshold U0, and the voltage threshold U0 and the DC voltage signal U1 are connected to a voltage comparison circuit 58. The output end of the voltage comparison circuit 58 is connected to the relay coil drive circuit 59 of the energized latching relay 50, and the normally open contacts of the energized latching relay 50 are respectively connected in series to the positive voltage end of the isolation motor drive circuit 37 and the positive voltage end of the electric control lock drive circuit 38.

[0023] In the present invention, the main line live refusal hardware circuit is independent of the control system and is not controlled by the intelligent control terminal 31. It realizes live detection through a pure hardware circuit and controls the operation of the live refusal relay 50. Even if the intelligent control terminal 31 issues an erroneous operation instruction to activate the isolation motor drive circuit 37 and the electric control lock drive circuit 38, the high-voltage disconnector will not open or close, thereby avoiding power outages in the collector line caused by the erroneous operation of the ice-melting switch and damage to the switch.

[0024] The voltage stabilizing circuit 56, voltage comparison circuit 58 and voltage regulating circuit 57 of the main line live refusal hardware circuit enable the anti-false operation threshold to be adjusted according to actual conditions. The live judgment and relay driving parts of the circuit adopt an inverse logic design to solve the problems of coil heating caused by long-term energized state of conventional interlock relays, circuit failure caused by mechanical fatigue, and functional failure.

[0025] The specific working principle is as follows: the 35kV collector line voltage is converted into an AC voltage of about 220V through a voltage transformer. This voltage signal is converted into a low-voltage AC signal after passing through a secondary EMI filter circuit 13 and a step-down transformer 52. This low-voltage AC signal is rectified by a rectifier module 53 and converted into a pulsating DC signal. This DC signal is converted into a DC voltage signal U1 that is substantially proportional to the collector line voltage after passing through a filter circuit 54 and a DC smoothing circuit 55. The battery 51 voltage is converted into a standard 24V DC voltage signal through a voltage stabilizing circuit 56. This voltage signal is converted into an adjustable voltage threshold U0 through an adjustable resistor according to actual conditions. The voltage threshold U0 is connected to the in-phase input terminal of the operational amplifier, and U1 is connected to the reverse input terminal of the operational amplifier. The output of the operational amplifier is connected to a drive circuit that can drive the coil of the live rejection relay 50. This constitutes an inverse logic voltage comparison circuit. Under normal conditions, the collector line carries a voltage of 35kV. At this time, U1 is greater than the voltage threshold U0, the output of the operational amplifier A1 is low, and the live refusal relay 50 does not operate. This is because the normally open contact K1 of the live refusal relay 50 is respectively connected in series with the positive voltage end of the knife-isolating motor drive circuit 37 and the positive voltage end of the electric control lock drive circuit 38. Therefore, at this time, even if the intelligent control terminal 31 issues an erroneous opening and closing instruction and has driven the relevant circuits to operate, the ice-melting switch will still not operate. When the collector line is powered off, U1 is less than the voltage threshold U0, the output of the operational amplifier A1 is high, the coil of the live refusal relay 50 is energized, the live refusal relay 50 is energized, and the normally open contact K1 is closed. At this time, there is voltage at the positive voltage end of the motor drive H-bridge circuit of the knife-isolating motor drive circuit 37 and the positive voltage end of the electric control lock drive circuit 38, and the knife-isolating motor 41 and the electric control lock coil 42 can operate normally. Through this hardware circuit, under normal conditions (the collector circuit is energized), the coil of the energized retarding relay 50 shall not be energized, and the energized retarding relay 50 is in a normally open state. Under an ice disaster state (the collector circuit is not energized for a short time), driven by the lead-acid battery pack 22, the energized retarding relay 50 is energized and closed, and the motor armature circuit and the electric control lock coil circuit can be normally conductive.

[0026] The control software is loaded on the upper computer to which the control system described in the present invention is communicated, so as to realize remote signaling, remote measurement and remote control of the ice-melting short-circuit switch in normal state and ice-melting state, and can observe the opening and closing state of the high-voltage isolating switch, whether it is covered with ice, and the indication information of the lightning protection device. The monitored information includes the opening and closing position information of the switch, the position information of the electric control lock, the primary line voltage, the ambient temperature, the temperature and humidity in the cabinet, the temperature and humidity in the control box, the battery power, and the total number of opening and closing actions of the switch.

[0027] The control system is equipped with an automatic opening and closing action flow of the high-voltage isolating switch and a fault self-diagnosis program to ensure the reliability of the opening and closing action of the ice-melting short-circuit switch.

[0028] like Figure 3 As shown, the specific steps of the automatic closing action process are as follows: Step S11: the background software issues a remote control closing command; Step S12: After receiving the closing command, the intelligent control terminal 31 makes a judgment based on the detected ambient temperature value. When the ambient temperature is higher than the temperature threshold (for example, 0°C), the system gives an alarm 1 to the background software and the process ends; if the temperature is lower than the temperature threshold (for example, 0°C), proceed to the next step; Step S13: When the above conditions are met, the intelligent control terminal 31 detects the voltage of the collector line. When it is detected that the line carries a voltage of 35 kV, the system gives an alarm 2 to the background software, and the process ends; if the collector line is not energized, proceed to the next step; Step S14: When the above conditions are met, the intelligent control terminal 31 controls the electric lock coil 42 to open; Step S15: When the intelligent control terminal 31 issues an electric lock opening command, if no electric lock opening signal is received within a set time (e.g., 2 seconds), the system gives an alarm 3 to the background software, and the process ends; when the electric lock opening signal is received within a set time (e.g., 2 seconds) and the signal is stable, the process proceeds to the next step; Step S16: When the above conditions are met, the intelligent control terminal 31 controls the high-voltage isolating switch to close, and controls the closing signal to turn on the MOS tubes Q3 and Q6 at the diagonal of the H-bridge circuit of the isolating motor drive circuit 37 to drive the isolating motor 41 to start in the forward direction; Step S17: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay 50 controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q3 and Q6 of the diagonal H-bridge circuit of the knife-isolating motor drive circuit 37 are turned on, the armature circuit of the knife-isolating motor 41 cannot be turned on, and the knife-isolating motor 41 does not start. At this time, the intelligent control terminal 31 detects that there is no current in the armature circuit of the knife-isolating motor 41, and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 4, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay 50 controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor 41 is fully turned on, and the knife-isolating motor 41 starts forward, and enters the next step; Step S18: When the knife-isolating motor 41 is started, and the intelligent control terminal 31 does not detect the closing signal within the set time threshold (for example, 6 seconds), the system gives an alarm 5 to the background software, and the process ends; Step S19: When the knife-isolating motor 41 is started and the intelligent control terminal 31 detects the closing signal within the set time threshold (for example, 6 seconds), the knife-isolating motor 41 stops at the moment of detecting the closing signal and proceeds to the next step; Step S110: After the knife-isolating motor 41 stops, the intelligent control terminal 31 sends a closing signal to the backend; Step S111: After the background receives the signal of closing position, the operator can observe the closing status of the ice-melting short-circuit switch through the camera field of view of the background software. When the video confirms that the closing position is in place, the process ends, and the collector line can be energized to melt ice at this time; Among them, the alarm code prompt displayed in the background is: Alarm 1: There is no ice disaster on the collector line, incorrect operation; Alarm 2: The collector circuit is not powered off, and the operation is wrong; Alarm 3: Electric lock failure; voltage detection circuit failure; Alarm 4: Motor drive circuit failure; voltage detection circuit failure; Alarm 5: Switch closing failure.

[0029] like Figure 4 As shown, the specific steps of the automatic opening action process are as follows: Step S21: the background software issues a remote control tripping command; Step S22: After receiving the opening command, the intelligent control terminal 31 detects the voltage of the collector line. When it is detected that the line carries a voltage of 35 kV, the system gives an alarm 6 to the background software, and the process ends; if the collector line is not energized, proceed to the next step; Step S23: When the above conditions are met, the intelligent control terminal 31 controls the electric lock coil 42 to open; Step S24: When the intelligent control terminal 31 issues an electric lock opening command, if no electric lock opening signal is received within a set time (e.g., 2 seconds), the system gives an alarm 7 to the background software, and the process ends; when the electric lock opening signal is received within a set time (e.g., 2 seconds) and the signal is stable, the next step is entered; Step S25: When the above conditions are met, the intelligent control terminal 31 controls the high-voltage disconnector to close, and controls the opening signal to turn on the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the disconnector motor drive circuit 37 to drive the motor to start in reverse; Step S26: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay 50 controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the knife-isolating motor drive circuit 37 are turned on, the armature circuit of the knife-isolating motor 41 cannot be turned on, and the knife-isolating motor 41 does not start. At this time, the intelligent control terminal 31 detects that there is no current in the armature circuit of the knife-isolating motor 41, and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 8, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay 50 controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor 41 is turned on, and the knife-isolating motor 41 starts in reverse, and enters the next step; Step S27: When the knife-isolating motor 41 is started, and within the set time threshold (for example, 6 seconds), the intelligent control terminal 31 does not detect the opening signal, the system gives an alarm 9 to the background software, and the process ends; Step S28: When the knife-isolating motor 41 is started and the intelligent control terminal 31 detects the closing signal within the set time threshold (for example, 6 seconds), the knife-isolating motor 41 stops at the moment when the opening signal is detected, and the next step is entered; Step S29: After the knife-isolating motor 41 stops, the intelligent control terminal 31 sends a switch-opening signal to the backend; Step S210: After the backend receives the opening signal, the operator can observe the opening status of the ice-melting short-circuit switch through the camera field of view of the backend software. When the video confirms that the opening is in place, the process ends; Among them, the alarm code prompt displayed in the background is: Alarm 6: The collector circuit is not powered off, incorrect operation; Alarm 7: Electric lock failure; Alarm 8: Motor drive circuit fault, voltage detection circuit fault; Alarm 9: Switch opening failure.

[0030] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collector line, wherein the remote-controlled ice-melting short-circuit switch is arranged at the end of a 35KV collector line, and comprises a closed cabinet, wherein an independent high-voltage chamber and a low-voltage chamber are arranged in the closed cabinet, wherein a high-voltage isolating switch, a voltage transformer and a lightning protection device are arranged in the high-voltage chamber, and an integrated control box, relevant controlled equipment and a video monitoring device are arranged in the low-voltage chamber, wherein: The control system of the remote-controlled ice-melting short-circuit switch comprises a power supply device (1), a battery management device (2), an intelligent control terminal and related control equipment (3), a main line live-proof hardware circuit (5) and high-voltage isolating switch related equipment (4). The power supply device (1) comprises a voltage transformer (11), a lightning protection device (12) and a secondary EMI filter circuit (13) connected in sequence; The battery management device (2) comprises a battery charging management module (21) and a lead-acid battery pack (22) which are connected to each other, and the battery charging management module (21) is connected to a secondary EMI filter circuit (13); The intelligent control terminal and related control equipment (3) include an intelligent control terminal (31) and a temperature and humidity sensor (32) connected thereto, a heater group with a fan (33), an ambient temperature sensor (34), a communication and monitoring device (35), a voltage detection circuit (36), a knife-shielding motor drive circuit (37) and an electric control lock drive circuit (38), and the secondary EMI filter circuit (13) is respectively connected to the above-mentioned equipment to realize voltage detection and power supply; The main line live refusal hardware circuit (5) is configured as a main line live detection circuit independent of the intelligent control terminal (31), and is arranged between the knife-isolating motor drive circuit (37), the electric control lock drive circuit (38) and the knife-isolating motor (41) and the electric control lock coil (42) of the high-voltage isolating switch related equipment, so as to realize live refusal of the high-voltage isolating switch; The high-voltage disconnect switch related equipment (4) further comprises a switch state sensor (43) and an electric lock state sensor (44), wherein the switch state sensor (43) and the electric lock state sensor (44) are respectively connected to the intelligent control terminal (31); The intelligent control terminal (31) is connected to a host computer via a communication line of the communication and monitoring device (35); the host computer can simultaneously monitor the states of a plurality of ice-melting short-circuit switches and control the plurality of ice-melting short-circuit switches.

2. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collection line according to claim 1, characterized in that: The communication and monitoring device (35) includes two communication modes implemented by using an optical fiber module (351) and a 4G gateway (352), and is connected to a corresponding camera 1 (353) and a camera 2 (354). The two independent communication interfaces of the intelligent control terminal (31) are respectively connected to the optical fiber module (351) and the 4G gateway (352), so as to realize communication and video monitoring between the host computer and the high-voltage disconnector, and observe the opening and closing status of the high-voltage disconnector, whether ice is applied, and the indication status of the lightning arrester.

3. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collection line according to claim 1, characterized in that: The main line live line refusal hardware circuit (5) is mainly composed of a battery (51), a step-down transformer (52), a rectifier module (53), a filter circuit (54), a DC smoothing circuit (55), a voltage stabilizing circuit (56), a voltage regulating circuit (57), a voltage comparison circuit (58), a relay coil drive circuit (59), and a live line refusal relay (50). The step-down transformer (52) is connected to a secondary EMI filter circuit (13) to convert the 35KV collector line voltage into a low-voltage AC signal, which is then converted into a DC voltage signal U1 that is substantially proportional to the collector line voltage after passing through a rectifier module (53), a filter circuit (54), and a DC smoothing circuit (55) that are connected in sequence. The voltage of the battery (51) is passed through a voltage stabilizing circuit (56), a voltage regulating circuit (57) that are connected in sequence. The voltage threshold U0 is converted into an adjustable voltage threshold U0, and the voltage threshold U0 and the DC voltage signal U1 are connected to a voltage comparison circuit (58). The output end of the voltage comparison circuit (58) is connected to a relay coil drive circuit (59) of an energized retarding relay (50), and the normally open contacts of the energized retarding relay (50) are respectively connected in series to the positive voltage end of the isolation knife motor drive circuit (37) and the positive voltage end of the electric control lock drive circuit (38).

4. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collection line according to claim 1, characterized in that: The host computer realizes remote signaling, remote measurement and remote control of the ice-melting short-circuit switch under normal conditions and ice-melting conditions, and can observe the opening and closing status of the high-voltage disconnector, whether it is covered with ice, and the indication information of the lightning protection device. The monitored information includes the opening and closing position information of the switch, the position information of the electric control lock, the primary line voltage, the ambient temperature, the temperature and humidity in the cabinet, the temperature and humidity in the control box, the battery power, and the total number of switch opening and closing actions.

5. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collection line according to claim 1, characterized in that: The control system is provided with an automatic opening and closing action process of the high-voltage disconnector and a fault self-diagnosis program. The specific steps of the automatic closing action process are as follows: Step S11: the background software issues a remote control closing command; Step S12: After receiving the closing command, the intelligent control terminal (31) makes a judgment based on the detected ambient temperature value. When the ambient temperature is higher than the temperature threshold, the system gives an alarm 1 to the background software, and the process ends; If the temperature is lower than the temperature threshold, go to the next step; Step S13: When the above conditions are met, the intelligent control terminal (31) detects the voltage of the collector line. When it is detected that the line carries a voltage of 35 kV, the system gives an alarm 2 to the background software and the process ends. If the collector line is not energized, proceed to the next step. Step S14: When the above conditions are met, the intelligent control terminal (31) controls the electric lock coil (42) to open; Step S15: After the intelligent control terminal (31) issues an electric lock opening command, if no electric lock opening signal is received within a set time, the system sends an alarm 3 to the background software, and the process ends; if the electric lock opening signal is received within the set time and the signal is stable, the process proceeds to the next step; Step S16: When the above conditions are met, the intelligent control terminal (31) controls the high-voltage disconnect switch to close, and controls the closing signal to turn on the MOS tube Q3 and the MOS tube Q6 at the diagonal of the H-bridge circuit of the disconnect motor drive circuit (37) to drive the disconnect motor (41) to start in the forward direction; Step S17: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay (50) controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q3 and Q6 of the H-bridge circuit diagonally of the knife-isolating motor drive circuit (37) are turned on, the armature circuit of the knife-isolating motor (41) cannot be turned on, and the knife-isolating motor (41) does not start. At this time, the intelligent control terminal (31) detects that there is no current in the armature circuit of the knife-isolating motor (41), and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 4, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay (50) controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor (41) is fully turned on, and the knife-isolating motor (41) starts forward, and enters the next step; Step S18: When the knife-isolating motor (41) is started and the intelligent control terminal (31) does not detect a closing signal within a set time threshold, the system sends an alarm 5 to the background software and the process ends; Step S19: When the knife-isolating motor (41) is started and the intelligent control terminal (31) detects a closing position signal within a set time threshold, the knife-isolating motor (41) stops at the moment the closing position signal is detected, and the next step is entered; Step S110: After the knife-isolating motor (41) stops, the intelligent control terminal (31) sends a closing signal to the backend; Step S111: After the background receives the signal of closing position, the operator can observe the closing status of the ice-melting short-circuit switch through the camera field of view of the background software. When the video confirms that the closing position is in place, the process ends, and the collector line can be energized to melt ice at this time; Among them, the alarm code prompt displayed in the background is: Alarm 1: There is no ice disaster on the collector line, incorrect operation; Alarm 2: The collector circuit is not powered off, and the operation is wrong; Alarm 3: Electric lock failure; voltage detection circuit failure; Alarm 4: Motor drive circuit failure; voltage detection circuit failure; Alarm 5: Switch closing failure.

6. A control system for a remote-controlled ice-melting short-circuit switch for a wind power collection line according to claim 5, characterized in that: The specific steps of the automatic opening action process are as follows: Step S21: the background software issues a remote control tripping command; Step S22: After receiving the opening command, the intelligent control terminal (31) detects the voltage of the collector line. When it is detected that the line carries a voltage of 35 kV, the system gives an alarm 6 to the background software, and the process ends. If the collector line is not energized, proceed to the next step. Step S23: When the above conditions are met, the intelligent control terminal (31) controls the electric lock coil (42) to open; Step S24: After the intelligent control terminal (31) issues an electric lock opening command, if no electric lock opening signal is received within a set time, the system sends an alarm 7 to the background software, and the process ends; if the electric lock opening signal is received within the set time and the signal is stable, the process proceeds to the next step; Step S25: When the above conditions are met, the intelligent control terminal (31) controls the high-voltage disconnect switch to close, and controls the opening signal to turn on the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the disconnecting motor drive circuit (37) to drive the motor to start in reverse; Step S26: When the main line live refusal hardware circuit detects that the collector line is live, the live refusal relay (50) controlled by the circuit does not operate, and the normally open point K1 is disconnected. At this time, even if the MOS tubes Q4 and Q5 at the diagonal of the H-bridge circuit of the knife-isolating motor drive circuit (37) are turned on, the armature circuit of the knife-isolating motor (41) cannot be turned on, and the knife-isolating motor (41) does not start. At this time, the intelligent control terminal (31) detects that there is no current in the armature circuit of the knife-isolating motor (41), and diagnoses that the main line live refusal hardware circuit refuses to operate. The system gives the background software an alarm 8, and the process ends; when the main line live refusal hardware circuit detects that the collector line is not live, the live refusal relay (50) controlled by the circuit operates, and the normally open point K1 is closed. At this time, the armature circuit of the knife-isolating motor (41) is turned on, and the knife-isolating motor (41) starts in reverse, and enters the next step; Step S27: When the knife-isolating motor (41) is started, and within the set time threshold, the intelligent control terminal (31) does not detect the opening signal, the system gives an alarm 9 to the background software, and the process ends; Step S28: When the knife-isolating motor (41) is started and the intelligent control terminal (31) detects a closing position signal within a set time threshold, the knife-isolating motor (41) stops at the moment when the opening position signal is detected, and the next step is entered; Step S29: After the knife-isolating motor (41) stops, the intelligent control terminal (31) sends a switch-opening signal to the backend; Step S210: After the backend receives the opening signal, the operator can observe the opening status of the ice-melting short-circuit switch through the camera field of view of the backend software. When the video confirms that the opening is in place, the process ends; Among them, the alarm code prompt displayed in the background is: Alarm 6: The collector circuit is not powered off, incorrect operation; Alarm 7: Electric lock failure; Alarm 8: Motor drive circuit fault, voltage detection circuit fault; Alarm 9: Switch opening failure.

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