A redundant communication method for long-distance power supply system in coal mine tunneling face

Abstract

The present invention belongs to the field of coal mine communication technology, and solves the problems of unstable data communication and limited transmission distance in the long-distance power supply system of the existing tunneling face. A redundant communication method for the long-distance power supply system of the coal mine tunneling face is provided. Inside the controller of the intelligent voltage regulating device on the mobile transformer side, the wired optical fiber communication data and the wireless WiFi6 communication data are analyzed and compared, and the data with the smallest error from the theoretical data of the long-distance power supply cable voltage drop model is selected as the basis for adjusting the voltage at the output end of the mobile transformer side; when no wired or wireless communication data is received within T1 by the controller of the intelligent voltage regulating device on the mobile transformer side, the power supply cable voltage drop model embedded in the controller is directly selected as the theoretical value basis for adjusting the output voltage of the mobile transformer side. The present invention adopts a redundant communication system of wired optical fiber communication + wireless WiFi6 communication, which can improve the reliability and stability of the communication in the long-distance power supply system of the tunneling face.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine communication, and particularly relates to a redundant communication method for a long-distance power supply system in a coal mine heading face. Background Art

[0002] At present, the length of the driving roadway in the coal mine heading face can be as far as 5900m. Due to the continuous decline of the power supply quality in the heading face, it is necessary to move the mobile transformer every 1000m during the operation of the heading equipment to meet the power supply quality of the heading equipment and solve problems such as difficult load starting, reduced cutting torque, and heating.

[0003] In view of the above problems, many experts and scholars have designed a long-distance power supply system for the coal mine underground heading face, installed current and voltage sensors on the load side to detect the load voltage and current in real time, and installed an intelligent voltage regulating device on the mobile transformer side to dynamically adjust the voltage of the power supply line so that the load voltage meets the specified power supply voltage range.

[0004] At present, the common data communication modes in the heading face are divided into two types: wired communication and wireless communication. The power line carrier wired communication mode has the disadvantages of being vulnerable to electromagnetic interference and unstable transmission quality; the CAN / RS485 wired communication has the disadvantages of limited transmission distance and weak anti-interference ability; the 3G wireless communication mode has the disadvantages of poor disaster resistance ability, high maintenance difficulty, and high system cost; the WiFi wireless communication mode has the disadvantages of high power consumption and weak anti-interference ability. Summary of the Invention

[0005] In order to solve at least one of the above technical problems in the prior art, the present invention provides a redundant communication method for a long-distance power supply system in a coal mine heading face.

[0006] The present invention is implemented by adopting the following technical solutions: A redundant communication method for a long-distance power supply system in a coal mine heading face, comprising the following steps:

[0007] S1: The monitoring device on the load side dynamically obtains the voltage on the load side of the heading face and transmits it to the intelligent voltage regulating device on the mobile transformer side in two modes: wired communication and wireless communication;

[0008] S2: Set the data reception time , when the intelligent voltage regulating device on the mobile transformer side does not receive the wired communication data within the set data reception time , go to step S3; when the intelligent voltage regulating device on the mobile transformer side does not receive the wireless communication data within the set data reception time , go to step S4; when neither the wired nor the wireless communication data is received within the set data reception time , go to step S5; when both the wired and wireless communication data are received within the set data reception time When both wired and wireless communication data are received, go to step S6;

[0009] S3: The intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wireless communication to calculate the arithmetic average voltage value on the load side under wireless communication and uses it as the basis for dynamically adjusting the output voltage of the mobile transformer side;

[0010] S4: The intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wired communication to calculate the arithmetic average voltage value on the load side under wired communication and uses it as the basis for dynamically adjusting the output voltage of the mobile transformer side;

[0011] S5: The intelligent voltage regulating device on the mobile transformer side calculates the terminal voltage value at this cable length through the built-in long-distance power supply cable voltage drop model and uses it as the basis for dynamically adjusting the output voltage of the mobile transformer side;

[0012] S6: The intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wired communication to calculate the arithmetic average voltage value on the load side under wired communication; the intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wireless communication to calculate the arithmetic average voltage value on the load side under wireless communication; the intelligent voltage regulating device on the mobile transformer side calculates the terminal voltage value at this cable length through the built-in long-distance power supply cable voltage drop model;

[0013] S7: Compare the arithmetic average voltage values on the load side under wired and wireless communications with the voltage value calculated by the long-distance power supply cable voltage drop model at the same time, and select the one with the smaller difference between the two as the basis for dynamically adjusting the output voltage of the mobile transformer side.

[0014] Preferably, the method for screening, decoding and calculating the data received by wired communication is: circularly receive data, eliminate abnormal data, then the decoding rate is defined as: , calculate the arithmetic average voltage value on the load side under wired communication 、 、 。

[0015] Preferably, the method for screening, decoding and calculating the data received by wireless communication is: circularly receive data, eliminate abnormal data, then the decoding rate is defined as: , calculate the arithmetic average voltage value on the load side under wireless communication 、 、 。

[0016] Preferably, set the terminal voltage value at this cable length calculated by the long-distance power supply cable voltage drop model to be 、 、 ;

[0017] Then the calculation formula for the line voltage error rate under wired communication is:

[0018] Or Or

[0019] The calculation formula for the line voltage error rate of wireless communication is:

[0020] Or Or

[0021] Taking the two formulas and selecting the smaller value among them as the basis for adjusting the voltage at the output end of the mobile substation , , .

[0022] Preferably, the theoretical average value of the voltage drop for a specified tunneling length is defined as ; The abnormal data are all data located outside the interval , .

[0023] Preferably, both the intelligent voltage regulating device on the mobile substation side and the monitoring device on the load side include a controller, a wireless module, and a network switch. The controller of the intelligent voltage regulating device on the mobile substation side has a long-distance power supply cable voltage drop model and a timer built-in; there are two ways for the controller of the monitoring device on the load side to obtain the voltage data of the load-side power supply system: Way 1: Communicate with the controller of the load-side electric control box via CAN or RS485 to obtain the voltage data of the load-side power supply system; Way 2: Install voltage sensors and current sensors at the load-side power supply cable, and input the detected analog signal into the controller of the monitoring device on the load side; The communication mode of the wireless modules of the intelligent voltage regulating device on the mobile substation side and the monitoring device on the load side is WiFi6 communication, and the communication mode of the network switches of the intelligent voltage regulating device on the mobile substation side and the monitoring device on the load side is wired fiber communication.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The present invention adopts a redundant communication system of wired fiber communication + wireless WiFi6 communication, which can improve the reliability and stability of the communication of the long-distance power supply system in the tunneling face. The controller inside the intelligent voltage regulating device on the mobile substation side analyzes and compares the wired fiber communication data and the wireless WiFi6 communication data, and selects the data with the smallest error from the theoretical data of the long-distance power supply cable voltage drop model as the basis for adjusting the voltage at the output end of the mobile substation, improving the accuracy of the voltage regulation of the long-distance power supply system in the tunneling face.

[0026] When no wired or wireless communication data is received within the intelligent voltage regulating device controller on the mobile transformer side, the voltage drop model of the power supply cable embedded in the controller is directly selected as the theoretical value basis for adjusting the output voltage on the mobile transformer side, increasing the communication fault tolerance of the long-distance power supply system in the tunneling working face. When no wired or wireless communication data is received within, the voltage drop model of the power supply cable embedded in the controller is directly selected as the theoretical value basis for adjusting the output voltage on the mobile transformer side, increasing the communication fault tolerance of the long-distance power supply system in the tunneling working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the communication structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Combined with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0030] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should fall within the scope that the technical content disclosed by the present invention can cover. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0031] The present invention provides an embodiment:

[0032] As Figure 1 shown, a redundant communication method for a long-distance power supply system in a coal mine tunneling working face includes the following steps:

[0033] S1: The load side monitoring device dynamically obtains the voltage on the load side of the tunneling working face and transmits it to the intelligent voltage regulating device on the mobile transformer side in two modes: wired communication and wireless communication;

[0034] S2: Set the data reception time , within the set data reception time When the intelligent voltage regulating device on the inner-transformer side does not receive the wired communication data, go to step S3; at the set data receiving time When the internal transformer-side intelligent voltage regulating device does not receive the wireless communication data, the process goes to step S4; at the set data receiving time If no wired or wireless communication data is received, go to step S5; at the set data receiving time When both wired and wireless communication data are received, go to step S6;

[0035] S3: The intelligent voltage regulating device on the transmission side screens and decodes the data received by the wireless communication to calculate the arithmetic average voltage value of the load side under the wireless communication and uses it as the basis for dynamically adjusting the output voltage of the transmission side;

[0036] S4: The intelligent voltage regulating device on the transmission side screens and decodes the data received by the wired communication to calculate the arithmetic average voltage value of the load side under the wired communication and uses it as the basis for dynamically adjusting the output voltage of the transmission side;

[0037] S5: The intelligent voltage regulating device on the transmission side calculates the voltage value of the voltage terminal under the cable length through the built-in long-distance power supply cable voltage drop model and takes it as the basis for dynamically adjusting the output voltage of the transmission side;

[0038] S6: the intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wired communication to calculate the arithmetic average voltage value on the load side under wired communication; the intelligent voltage regulating device on the mobile transformer side screens and decodes the data received by wireless communication to calculate the arithmetic average voltage value on the load side under wireless communication; the intelligent voltage regulating device on the mobile transformer side calculates the voltage terminal voltage value under the cable length through the built-in long-distance power supply cable voltage drop model;

[0039] S7: Compare the arithmetic mean voltage values of the load side under wired and wireless communications with the voltage values calculated by the long-distance power supply cable voltage drop model at the same time, and select the smaller difference between the two as the basis for dynamically adjusting the output voltage of the transmission side.

[0040] In this embodiment, the intelligent voltage regulating device on the shifting side is used to dynamically and real-time adjust the voltage of the power supply system of the excavation working face. , as well as , so that the voltage fluctuation range is within the set range (this patent is for the 1140V power supply system of the underground coal mine excavation working face, and the set voltage fluctuation range is 970-1311V). The load side monitoring device is used to dynamically obtain the voltage of the load side power supply system of the excavation working face , , (Line voltage).

[0041] The intelligent voltage regulating device on the transformer side and the load side monitoring device both include a controller, a wireless module, and a network switch. The controller of the intelligent voltage regulating device on the transformer side has a built-in long-distance power supply cable voltage drop model and a timer; there are two ways for the controller of the load side monitoring device to obtain the voltage data of the load side power supply system: Method 1: CAN or RS485 communication with the load side electric control box controller to obtain the voltage data of the load side power supply system; Method 2: Install voltage sensors and current sensors on the load side power supply cable, and input the detected analog signals into the controller of the load side monitoring device; The communication mode of the wireless modules of the intelligent voltage regulating device on the transformer side and the load side monitoring device is WiFi6 communication, and the communication mode of the network switches of the intelligent voltage regulating device on the transformer side and the load side monitoring device is wired optical fiber communication.

[0042] The wireless communication mode is WiFi6. WiFi6 works in the 2.4GHz and 5GHz frequency bands. Compared with previous standards, it has greatly improved in transmission rate, concurrent number, latency, etc. The peak rate reaches 9.6Gbit / s (160MHz bandwidth, 8T8R). The maximum number of accesses for each access point is 1024, the maximum number of concurrent users can reach 72, and the network latency is no more than 20ms.

[0043] When the intelligent voltage regulating device controller on the transfer transformer side receives wired or wireless communication data, the timer is started , If no data is received after the timeout, the communication mode is considered to be interrupted and all data in this communication mode are discarded.

[0044] The method of filtering and decoding the data received by wired communication is: cyclic reception data, remove abnormal data, the decoding rate is defined as: , calculate the load side arithmetic average voltage value under wired communication , , (line voltage), , , Specifically refers to The corresponding data The average line voltage at the three-phase lines.

[0045] The method of filtering and decoding the data received by wireless communication is: cyclic reception data, remove abnormal data, the decoding rate is defined as: , calculate the arithmetic average voltage value of the load side under wireless communication , , (line voltage), , , Specifically refers to the corresponding average line voltage at the three-phase line.

[0046] The long-distance power supply cable voltage drop model is a voltage drop model built based on the line resistance, line inductance, and power factor of the used power supply cable. This voltage drop model is related to the voltage level on the power supply side and the motor power on the equipment side. This voltage drop model can be implemented in Matlab and can calculate the power supply line voltage drop when the power supply distance is 200m, 1200m, 2200m, and 3000m. This model is not the focus of this patent. The power supply cable line voltage drop can also be obtained according to empirical values.

[0047] Set the voltage terminal voltage value calculated by the long-distance power supply cable voltage drop model at this cable length to , , (line voltage); define the theoretical average value of the voltage drop for a specified tunneling length as ; The abnormal data is all data located outside the interval , .

[0048] Then the calculation formula for the line voltage error rate under wired communication is:

[0049] Or Or

[0050] The calculation formula for the line voltage error rate of wireless communication is:

[0051] Or Or

[0052] Take the two formulas and select the smaller value among them as the basis for adjusting the output voltage of the shift transformer side , , .

[0053] As described above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A redundant communication method for a long-distance power supply system in a coal mine tunneling face, characterized in that, It includes the following steps: S1: The load-side monitoring device dynamically obtains the load-side voltage of the tunneling face and transmits it to the intelligent voltage regulating device on the transformer side in two modes: wired communication and wireless communication. S2: Set the data reception time , when the intelligent voltage regulating device on the shift side does not receive the wired communication data within the set data reception time , go to step S3; when the intelligent voltage regulating device on the shift side does not receive the wireless communication data within the set data reception time , go to step S4; when neither the wired nor the wireless communication data is received within the set data reception time , go to step S5; when both the wired and the wireless communication data are received within the set data reception time , go to step S6; S3: The intelligent voltage regulating device on the transformer side screens and decodes the data received by wireless communication, calculates the arithmetic average voltage value on the load side under wireless communication, and uses it as the basis for dynamically adjusting the output voltage of the transformer side. S4: The intelligent voltage regulating device on the transformer side screens and decodes the data received by wired communication, calculates the arithmetic average voltage value on the load side under wired communication, and uses it as the basis for dynamically adjusting the output voltage of the transformer side. S5: The intelligent voltage regulating device on the transformer side calculates the terminal voltage value at this cable length through the built-in long-distance power supply cable voltage drop model and uses it as the basis for dynamically adjusting the output voltage of the transformer side. S6: The intelligent voltage regulating device on the transformer side screens and decodes the data received by wired communication and calculates the arithmetic average voltage value on the load side under wired communication; the intelligent voltage regulating device on the transformer side screens and decodes the data received by wireless communication and calculates the arithmetic average voltage value on the load side under wireless communication. The intelligent voltage regulating device on the transformer side calculates the terminal voltage value at this cable length through the built-in long-distance power supply cable voltage drop model. S7: Compare the arithmetic mean voltage values on the load side under wired and wireless communications respectively with the voltage values calculated by the long-distance power supply cable voltage drop model at the same moment, and select the one with the smaller difference between the two as the basis for dynamically adjusting the output voltage of the mobile substation side; set the voltage terminal voltage value calculated by the long-distance power supply cable voltage drop model for this cable length as , , ; Then the calculation formula for the line voltage error rate under wired communication is: or or Wherein, , , are the arithmetic mean voltage values on the load side under wired communication; The calculation formula for the line voltage error rate of wireless communication is: or or In the formula, , , are the arithmetic mean voltage values on the load side under wireless communication; For the collection and comparison type, select the smaller value as the basis for adjusting the voltage at the output terminal of the shifting side. , , .

2. A redundant communication method for a long-distance power supply system in a coal mine tunneling face according to claim 1, characterized in that: The method for data screening and decoding calculation of wired communication reception is as follows: Receive cyclically data, eliminate abnormal data, and the decoding rate is defined as: , calculate the arithmetic mean voltage value on the load side under wired communication , , .

3. A redundant communication method for a long-distance power supply system in a coal mine tunneling face according to claim 2, characterized in that: The method for data screening and decoding calculation of wireless communication reception is as follows: receive cyclically a number of abnormal data, and the decoding rate is defined as: , and calculate the arithmetic mean voltage value on the load side under wireless communication , , .

4. A redundant communication method for a long-distance power supply system at a coal mine tunneling face according to claim 3, characterized in that: Define the theoretical average value of the voltage drop for the specified tunneling length as ; the abnormal data are all the data located outside the interval , .

5. A redundant communication method for a long-distance power supply system in a coal mine tunneling face according to claim 4, characterized in that: Both the intelligent voltage regulating device on the transformer side and the load-side monitoring device include a controller, a wireless module, and a network switch. The controller of the intelligent voltage regulating device on the transformer side has a built-in long-distance power supply cable voltage drop model and a timer; there are two ways for the controller of the load-side monitoring device to obtain the voltage data of the load-side power supply system: Way 1: Communicate with the controller of the load-side electric control box through CAN or RS485 to obtain the voltage data of the load-side power supply system; Way 2: Install voltage sensors and current sensors at the load-side power supply cable, and input the detected analog signal into the controller of the load-side monitoring device; the communication mode of the wireless modules of the intelligent voltage regulating device on the transformer side and the load-side monitoring device is WiFi6 communication, and the communication mode of the network switches of the intelligent voltage regulating device on the transformer side and the load-side monitoring device is wired optical fiber communication.

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