Wind power plant current collection line fault early warning and positioning device and fault early warning and positioning method thereof

Abstract

The invention discloses a wind power plant current collection line fault early warning and positioning device which comprises a plurality of tower units, the tower units are sequentially connected through overhead conductors, each tower unit is connected with a signal acquisition unit, and the signal acquisition units are jointly connected to a current collection line fault early warning and positioning terminal through signal lines. The invention further discloses a fault early warning and positioning method. The method specifically comprises the following steps of S1, performing self-inspection after the device is powered on; s2, inquiring whether related operation is carried out after preset parameter setting is carried out or not; s3, entering time delay and sampling, and collecting the acquisition quantity of the capacitor voltage transformer, the first current transformer and the second current transformer; and S4, comparing the acquisition quantities of the voltage and the current with preset parameters to realize fault early warning and positioning of the current collection line of the wind power plant. According to the wind power plant current collection line fault early warning positioning device, the wind power plant current collection line fault probability is reduced, and the current collection line fault searching time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind farm collector line fault early warning positioning device. The present invention also relates to a fault early warning positioning method using the early warning positioning device. Background Art

[0002] In the field of wind power generation, the collector line transmits the electricity generated by the wind turbine to the booster station. Since wind turbines are mostly installed in areas such as hillsides, deserts and seashore mudflats, and considering the high cost and difficulty of the project, in order to better save construction costs, the collector lines of wind farms generally use overhead collector lines. Overhead collector lines and towers are mostly installed on mountain tops or ridges, so they are easily struck by lightning. Lightning strikes often cause the collector line to trip or even damage the equipment. Since the wind farm collector line needs to connect multiple wind turbines and has multiple terminals, the traveling wave method used for transmission line fault location is not applicable to wind farm collector line fault location. Summary of the invention

[0003] The purpose of the present invention is to provide a wind farm collector line fault early warning and positioning device, which solves the problem of difficulty in early warning and positioning of wind farm collector line faults in the prior art.

[0004] Another object of the present invention is to provide a fault early warning positioning method using the early warning positioning device.

[0005] The first technical solution adopted by the present invention is: a wind farm collector line fault warning and positioning device, including a plurality of pole tower units, which are connected in sequence through overhead wires, each of which is respectively connected to a signal acquisition unit, and each signal acquisition unit is connected to a collector line fault warning and positioning terminal through a signal line.

[0006] The first technical solution of the present invention is also characterized in that:

[0007] The pole tower unit includes a pole tower. The bottom of the pole tower is grounded. The top of each pole tower is connected to a lightning conductor. The end of the pole tower close to the top is connected to a cross arm. Each cross arm is connected to an insulator string. The other end of each insulator string is hung with an overhead wire. A line lightning arrester is also connected between the cross arm and the overhead wire.

[0008] The signal acquisition unit includes a plurality of first current transformers, each of which is arranged at the grounding electrode of the corresponding tower; it also includes a plurality of second current transformers, each of which is arranged between the corresponding cross arm and the line lightning arrester; it also includes a capacitive voltage transformer arranged on the first tower, and the two poles of the capacitive voltage transformer are respectively connected to the cross arm and the overhead wire; the first current transformer, the second current transformer and the capacitive voltage transformer are respectively connected to the corresponding local signal adoption box through the signal line, and each local signal adoption box is connected to the collector line fault warning and positioning terminal through the signal line.

[0009] The first current transformer and the second current transformer are Rogowski coils. The current sampled by the first current transformer is [I I1 , I I2 , I I3 , ..., I In ], where 1, 2, 3...n are the numbers of several towers of the collector line; the current sampled by the second current transformer is, phase A: [I aII1 , I aII2 , I aII3 , ..., I aIIn ], B phase: [I bII1 , I bII2 , I bII3 , ..., I bIIn ], C phase: [I cII1 , I cII2 , I cII3 , ..., I cIIn ]; The voltages collected by the capacitive voltage transformer 6 are Ua, Ub, and Uc.

[0010] The second technical solution adopted by the present invention is a method for using a wind farm collector line fault early warning positioning device to perform wind farm collector line fault early warning positioning, which specifically includes the following steps:

[0011] S1: After the wind farm collector line fault warning and positioning device is powered on, a self-check is performed. If there is an abnormality in the self-check process, the collector line fault warning and positioning terminal will process it. If the self-check is normal, the next step will be entered;

[0012] S2: Ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. Otherwise, skip the preset parameter setting and go to the next step.

[0013] S3: Entering the delay and sampling process, the delay and sampling process firstly performs the delay according to the set value, and then collects the collected data of the capacitive voltage transformer, the first current transformer and the second current transformer;

[0014] S4: Compare the collected voltage and current with the preset parameters, which correspond to the stop of the collector line, the normal operation of the collector line, the abnormal insulation of the lightning arrester, the lightning fault of the collector line, and the dancing grounding fault of the collector line.

[0015] The second technical solution of the present invention is also characterized in that:

[0016] The specific process of S1 is:

[0017] The wind farm collector line fault warning and positioning device is powered on and starts self-testing. First, the collector line fault warning and positioning terminal is used to perform a test on the capacitive voltage transformer, the first current transformer, and the second current transformer.

[0018] If the data of the capacitive voltage transformer, the first current transformer and the second current transformer cannot be obtained, the self-test is abnormal; if there is an abnormality in the self-test process, the information is sent to the collector line fault warning and positioning terminal 10: system failure, and it is displayed, and then the wind farm collector line fault warning and positioning device enters a dormant state;

[0019] If the self-test is normal, proceed to the next step.

[0020] The specific process of S2 is:

[0021] First, you will be asked whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. The preset parameters include the rated voltage U of the collector line. an , U bn , U cn ; Rated allowable leakage current A phase under line arrester operating voltage: [I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ], B phase: [I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ], C phase: [I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ] and delay t0;

[0022] Otherwise, skip the preset parameter settings and enter delay and sampling.

[0023] The specific process of S3 is:

[0024] The delay and sampling are first delayed according to the set value, and then the collected quantities of the capacitive voltage transformer, the first current transformer and the second current transformer are collected;

[0025] The specific process of S4 is:

[0026] Compare the collected voltage and current with the preset parameters, which correspond to the collector line stopping operation, the collector line normal operation, the arrester insulation abnormality, the collector line lightning fault, and the collector line dancing grounding fault, as follows:

[0027] Lightning fault of collector line: When max[U a , U b , U c ]>max[U an , U bn , U cn ], and max[I I1 , I I2 , I I3 , ..., I In ]>0, and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that a lightning fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal: a lightning fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0028] Collector line dancing grounding fault: when min[U a , U b , U c]<min[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]>0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that a dancing grounding fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal: a dancing grounding fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0029] Line arrester insulation abnormality: When max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , IcII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that the insulation of the collector line arrester is abnormal and the fault location is at max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal: the insulation of the collector line arrester is abnormal, and the location of the arrester with the abnormal insulation is located. Then it asks whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0030] Normal operation of the collector line: When [U a , U b , U c ]=[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I'aII3 , ..., I' aIIn ],[I' bII1 , I 'bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that the collector line is operating normally. When the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal: the collector line is operating normally, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0031] The collector line stops running: when [U a , U b , U c ]=0 and [I I1 , I I2 , I I3 , ..., I In ]=0 and [[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , Ib II2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]=0, it can be determined that the collector line is in a stopped state. At this time, a message is sent to the collector line fault warning and positioning terminal: the collector line stops running, and then asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends, and asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends and enters S2.

[0032] The beneficial effects of the present invention are:

[0033] The wind farm collector line fault warning and positioning device and fault warning and positioning method of the present invention are used to obtain the current of each tower and the tail end of the line arrester of the collector line and the voltage of the three-phase line by installing current transformers and capacitive voltage transformers; the voltage and current collection amounts are compared with preset parameters, corresponding to the collector line shutdown, normal operation, arrester insulation abnormality, line lightning fault, line dancing and other states, respectively, to achieve wind farm collector line fault warning and positioning. The wind farm collector line fault probability is reduced, the collector line fault search time is shortened, and the operating cost is reduced at the same time, which is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a wind farm collector line fault early warning and positioning device of the present invention;

[0035] Figure 2 It is a schematic flow chart of the wind farm collector line fault early warning and positioning method of the present invention.

[0036] In the figure: 1. Pole tower, 2. Lightning conductor, 3. Overhead conductor, 4. Insulator string, 5. Line lightning arrester, 6. Capacitive voltage transformer, 7. Second current transformer, 8. First current transformer, 9. Local signal box, 10. Collector line fault warning and positioning terminal. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, the present invention provides a wind farm collector line fault warning and positioning device, including a plurality of pole tower units, which are connected in sequence through overhead wires 3, each of which is respectively connected to a signal acquisition unit, and each signal acquisition unit is commonly connected to a collector line fault warning and positioning terminal 10 through a signal line.

[0039] The pole tower unit includes a pole tower 1, the bottom of the pole tower 1 is grounded, the top of each pole tower 1 is connected to a lightning arrester 2, the end of the pole tower 1 close to the top is connected to a cross arm, each cross arm is connected to an insulator string 4, the other end of each insulator string 4 is hung with an overhead wire 3, and a line lightning arrester 5 is also connected between the cross arm and the overhead wire 3.

[0040] The signal acquisition unit includes a plurality of first current transformers 8, each of which is arranged at the grounding electrode of the corresponding tower 1; it also includes a plurality of second current transformers 7, each of which is arranged between the corresponding cross arm and the line lightning arrester 5; it also includes a capacitive voltage transformer 6 arranged on the first tower 1, and the two poles of the capacitive voltage transformer 6 are respectively connected to the cross arm and the overhead conductor 3; the first current transformer 8, the second current transformer 7 and the capacitive voltage transformer 6 are respectively connected to the corresponding local signal adoption box 9 through signal lines, each local signal adoption box 9 is connected to the collector line fault warning and positioning terminal 10 through the signal line, and the local signal adoption box 9 transmits the collected signal to the collector line fault warning and positioning terminal 10, and processes and analyzes the data in the collector line fault warning and positioning terminal 10.

[0041] The first current transformer 8 and the second current transformer 7 are Rogowski coils. The current sampled by the first current transformer 8 is [I I1, I I2 , I I3 , ..., I In ], where 1, 2, 3...n are the numbers of several towers 1 of the collector line; the current sampled by the second current transformer 7 is, phase A: [I aII1 , I aII2 , I aII3 , ..., I aIIn ], B phase: [I bII1 , I bII2 , I bII3 , ..., I bIIn ], C phase: [I cII1 , I cII2 , I cII3 , ..., I cIIn ]; The voltages collected by the capacitive voltage transformer 6 are Ua, Ub, and Uc.

[0042] The wind farm collector line fault warning and positioning device provided by the present invention has the following working principle: by installing a current transformer and a capacitive voltage transformer 6, the current of each pole tower and the tail end of the line lightning arrester 5 of the collector line and the voltage of the three-phase line are obtained; the voltage and current collection amounts are compared with preset parameters, which correspond to various states such as collector line shutdown, normal operation, lightning arrester insulation abnormality, line lightning fault, line dancing, etc., to achieve wind farm collector line fault warning and positioning.

[0043] The method for fault early warning positioning using a wind farm collector line fault early warning positioning device specifically comprises the following steps:

[0044] S1: Power on the wind farm collector line fault warning and positioning device and start self-testing; first, use the collector line fault warning and positioning terminal 10 to perform a test on the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7;

[0045] If the data of the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7 cannot be obtained, the self-check is abnormal; if there is an abnormality in the self-check process, the information is sent to the collector line fault warning and positioning terminal 10: system failure, and it is displayed, and then the wind farm collector line fault warning and positioning device enters a dormant state;

[0046] If the self-test is normal, proceed to the next step.

[0047] S2: First, ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. The preset parameters include the rated voltage U of the collector line. an , U bn , U cn ; Rated allowable leakage current A phase of line arrester 5 operating voltage: [I'aII1 , I' aII2 , I' aII3 , ..., I' aIIn ], B phase: [I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ], C phase: [I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ] and delay t0;

[0048] Otherwise, skip the preset parameter settings and enter delay and sampling.

[0049] S3: Delay and sampling Firstly, the delay is performed according to the set value, and then the collected data of the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7 are collected;

[0050] S4: Compare the collected voltage and current with the preset parameters, which correspond to the stop of the collector line, the normal operation of the collector line, the abnormal insulation of the lightning arrester, the lightning fault of the collector line, and the dancing grounding fault of the collector line, as follows:

[0051] Lightning fault of collector line: When max[U a , U b , U c ]>max[U an , U bn , U cn ], and max[I I1 , I I2 , I I3 , ..., I In ]>0, and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I'cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that a lightning fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: a lightning fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0052] Collector line dancing grounding fault: when min[U a , U b , U c ]<min[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]>0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that a dancing grounding fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: a dancing grounding fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0053] Line arrester insulation abnormality: When max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that the insulation of the collector line arrester is abnormal and the fault location is at max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: the insulation of the collector line lightning arrester is abnormal, and the location of the lightning arrester with abnormal insulation is located. Then it asks whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0054] Normal operation of the collector line: When [U a , U b , Uc ]=[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I 'bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that the collector line is operating normally. When the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: the collector line is operating normally, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0055] The collector line stops running: when [U a , U b , U c ]=0 and [I I1 , I I2 , I I3 , ..., I In ]=0 and [[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , Ib II2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn]]=0, it can be determined that the collector line is in a stopped state. At this time, a message is sent to the collector line fault warning and positioning terminal 10: the collector line stops running, and then asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends, and asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends and enters S2.

[0056] Example 1

[0057] like Figure 1 As shown, the wind farm collector line fault warning and positioning device proposed in this embodiment includes a plurality of pole tower units, which are connected in sequence through overhead wires 3, each of which is respectively connected to a signal acquisition unit, and each signal acquisition unit is commonly connected to a collector line fault warning and positioning terminal 10 through a signal line.

[0058] Example 2

[0059] like Figure 1 As shown, the wind farm collector line fault warning and positioning device proposed in this embodiment includes a plurality of tower units, which are connected in sequence through overhead wires 3, each tower unit is respectively connected to a signal acquisition unit, and each signal acquisition unit is commonly connected to the collector line fault warning and positioning terminal 10 through a signal line. The tower unit includes a tower 1, the bottom of the tower 1 is grounded, the top of each tower 1 is commonly connected to a lightning arrester 2, one end of the tower 1 close to the top is connected to a cross arm, each cross arm is connected to an insulator string 4, the other end of each insulator string 4 is commonly suspended with an overhead wire 3, and a line lightning arrester 5 is also connected between the cross arm and the overhead wire 3. The signal acquisition unit includes a plurality of first current transformers 8, each of which is arranged at the grounding electrode of the corresponding tower 1; it also includes a plurality of second current transformers 7, each of which is arranged between the corresponding cross arm and the line lightning arrester 5; it also includes a capacitive voltage transformer 6 arranged on the first tower 1, and the two poles of the capacitive voltage transformer 6 are respectively connected to the cross arm and the overhead conductor 3; the first current transformer 8, the second current transformer 7 and the capacitive voltage transformer 6 are respectively connected to the corresponding local signal adopting box 9 through the signal line, and each local signal adopting box 9 is connected to the collector line fault warning and positioning terminal 10 through the signal line.

[0060] Example 3

[0061] like Figure 1As shown, the wind farm collector line fault warning and positioning device proposed in this embodiment includes a plurality of tower units, which are connected in sequence through overhead wires 3, each tower unit is respectively connected to a signal acquisition unit, and each signal acquisition unit is commonly connected to the collector line fault warning and positioning terminal 10 through a signal line. The tower unit includes a tower 1, the bottom of the tower 1 is grounded, the top of each tower 1 is commonly connected to a lightning arrester 2, one end of the tower 1 close to the top is connected to a cross arm, each cross arm is connected to an insulator string 4, the other end of each insulator string 4 is commonly suspended with an overhead wire 3, and a line lightning arrester 5 is also connected between the cross arm and the overhead wire 3. The signal acquisition unit includes a plurality of first current transformers 8, each of which is arranged at the grounding electrode of the corresponding tower 1; it also includes a plurality of second current transformers 7, each of which is arranged between the corresponding cross arm and the line lightning arrester 5; it also includes a capacitive voltage transformer 6 arranged on the first tower 1, and the two poles of the capacitive voltage transformer 6 are respectively connected to the cross arm and the overhead conductor 3; the first current transformer 8, the second current transformer 7 and the capacitive voltage transformer 6 are respectively connected to the corresponding local signal adoption box 9 through the signal line, and each local signal adoption box 9 is connected to the collector line fault warning and positioning terminal 10 through the signal line. The first current transformer 8 and the second current transformer 7 are Rogowski coils, and the current sampled by the first current transformer 8 is [I I1 , I I2 , I I3 , ..., I In ], where 1, 2, 3...n are the numbers of several towers 1 of the collector line; the current sampled by the second current transformer 7 is, phase A: [I aII1 , I aII2 , I aII3 , ..., I aIIn ], B phase: [I bII1 , I bII2 , I bII3 , ..., I bIIn ], C phase: [I cII1 , I cII2 , I cII3 , ..., I cIIn ]; The voltages collected by the capacitive voltage transformer 6 are Ua, Ub, and Uc.

[0062] Example 4

[0063] like Figure 2 As shown, the present invention provides a method for early warning and locating faults in a wind farm collector line, which specifically includes the following steps:

[0064] S1: After the wind farm collector line fault warning and positioning device is powered on, a self-check is performed. If there is an abnormality in the self-check process, the collector line fault warning and positioning terminal 10 processes it. If the self-check is normal, the next step is entered;

[0065] S2: Ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. Otherwise, skip the preset parameter setting and go to the next step.

[0066] S3: Entering the delay and sampling process, the delay and sampling process is first delayed according to the set value, and then the collected data of the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7 are collected;

[0067] S4: Compare the collected voltage and current with the preset parameters, which correspond to the stop of the collector line, the normal operation of the collector line, the abnormal insulation of the lightning arrester, the lightning fault of the collector line, and the dancing grounding fault of the collector line.

[0068] Example 5

[0069] like Figure 2 As shown, the present invention provides a method for early warning and locating faults in a wind farm collector line, which specifically includes the following steps:

[0070] S1: Power on the wind farm collector line fault warning and positioning device and start self-testing; first, use the collector line fault warning and positioning terminal 10 to perform a test on the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7;

[0071] If the data of the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7 cannot be obtained, the self-check is abnormal; if there is an abnormality in the self-check process, the information is sent to the collector line fault warning and positioning terminal 10: system failure, and it is displayed, and then the wind farm collector line fault warning and positioning device enters a dormant state;

[0072] If the self-test is normal, proceed to the next step.

[0073] S2: First, ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. The preset parameters include the rated voltage U of the collector line. an , U bn , U cn ; Rated allowable leakage current A phase of line arrester 5 operating voltage: [I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ], B phase: [I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn], C phase: [I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ] and delay t0;

[0074] Otherwise, skip the preset parameter settings and enter delay and sampling.

[0075] S3: Delay and sampling Firstly, the delay is performed according to the set value, and then the collected data of the capacitive voltage transformer 6, the first current transformer 8 and the second current transformer 7 are collected;

[0076] S4: Compare the collected voltage and current with the preset parameters, which correspond to the stop of the collector line, the normal operation of the collector line, the abnormal insulation of the lightning arrester, the lightning fault of the collector line, and the dancing grounding fault of the collector line, as follows:

[0077] Lightning fault of collector line: When max[U a , U b , U c ]>max[U an , U bn , U cn ], and max[I I1 , I I2 , I I3 , ..., I In ]>0, and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that a lightning fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3, ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: a lightning fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0078] Collector line dancing grounding fault: when min[U a , U b , U c ]<min[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]>0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that a dancing grounding fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: a dancing grounding fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2;

[0079] Line arrester insulation abnormality: When max[I I1 , I I2 , II3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that the insulation of the collector line arrester is abnormal and the fault location is at max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: the insulation of the collector line lightning arrester is abnormal, and the location of the lightning arrester with abnormal insulation is located. Then it asks whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0080] Normal operation of the collector line: When [U a , U b , U c ]=[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , IaII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I 'bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that the collector line is operating normally. When the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal 10: the collector line is operating normally, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2.

[0081] The collector line stops running: when [U a , U b , U c ]=0 and [I I1 , I I2 , I I3 , ..., I In ]=0 and [[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , Ib II2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]=0, it can be determined that the collector line is in a stopped state. At this time, a message is sent to the collector line fault warning and positioning terminal 10: the collector line stops running, and then asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends, and asks whether to sleep, and enters the sleep state after confirmation. If the above conditions are not met, the first round of circulation ends and enters S2.

Claims

1. A wind farm collector line fault early warning and positioning device, characterized in that: It comprises a plurality of pole tower units, which are connected in sequence via an overhead wire (3), each of which is connected to a signal collection unit, and each of which is connected to a collector line fault warning and positioning terminal (10) via a signal line.

2. The wind farm collector line fault early warning and positioning device according to claim 1, characterized in that: The pole tower unit comprises a pole tower (1), the bottom of the pole tower (1) is grounded, the top of each pole tower (1) is commonly connected to a lightning arrester (2), one end of the pole tower (1) close to the top is connected to a cross arm, each of the cross arms is connected to an insulator string (4), an overhead wire (3) is commonly suspended at the other end of each of the insulator strings (4), and a line lightning arrester (5) is also connected between the cross arm and the overhead wire (3).

3. The wind farm collector line fault early warning and positioning device according to claim 2, characterized in that: The signal acquisition unit comprises a plurality of first current transformers (8), each of which is arranged at the grounding electrode of the corresponding pole tower (1); a plurality of second current transformers (7), each of which is arranged between the corresponding cross arm and the line lightning arrester (5); and a capacitive voltage transformer (6) arranged on the first pole tower (1), the two poles of the capacitive voltage transformer (6) being respectively connected to the cross arm and the overhead conductor (3); the first current transformer (8), the second current transformer (7) and the capacitive voltage transformer (6) are respectively connected to the corresponding local signal adopting box (9) through signal lines, and each of the local signal adopting boxes (9) is connected to the collector line fault warning and positioning terminal (10) through the signal line.

4. The wind farm collector line fault early warning and positioning device according to claim 3, characterized in that: The first current transformer (8) and the second current transformer (7) are Rogowski coils, and the current sampled by the first current transformer (8) is [I I1 , I I2 , I I3 , ..., I In ], wherein 1, 2, 3, ... n are numbers of a plurality of towers (1) of the collector line; the current sampled by the second current transformer (7) is, phase A: [I aII1 , I aII2 , I aII3 , ..., I aIIn ], B phase: [I bII1 , I bII2 , I bII3 , ..., I bIIn ], C phase: [I cII1 , I cII2 , I cII3 , ..., I cIIn ]; The voltages collected by the capacitive voltage transformer (6) are Ua, Ub, and Uc.

5. A method for performing wind farm collector line fault early warning and positioning using the wind farm collector line fault early warning and positioning device as claimed in claim 4, characterized in that: The specific steps include: S1: After the wind farm collector line fault warning and positioning device is powered on, a self-check is performed. If there is an abnormality in the self-check process, the collector line fault warning and positioning terminal (10) performs processing. If the self-check is normal, the next step is entered; S2: Ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. Otherwise, skip the preset parameter setting and go to the next step. S3: Entering the delay and sampling process, the delay and sampling process firstly delays according to the set value, and then collects the collected data of the capacitive voltage transformer (6), the first current transformer (8) and the second current transformer (7); S4: Compare the collected voltage and current with the preset parameters, which correspond to the stop of the collector line, the normal operation of the collector line, the abnormal insulation of the lightning arrester, the lightning fault of the collector line, and the dancing grounding fault of the collector line.

6. The method for early warning and locating faults of wind farm collector lines according to claim 5, characterized in that: The specific process of S1 is as follows: The wind farm collector line fault warning and positioning device is powered on to start self-testing; firstly, a collector line fault warning and positioning terminal (10) is used to perform a test on a capacitive voltage transformer (6), a first current transformer (8) and a second current transformer (7); If the data of the capacitive voltage transformer (6), the first current transformer (8) and the second current transformer (7) cannot be obtained, the self-check is abnormal; If there is an abnormality in the self-checking process, the information is sent to the collector line fault warning and positioning terminal (10): system failure, and the information is displayed, and then the wind farm collector line fault warning and positioning device enters a dormant state; If the self-test is normal, proceed to the next step.

7. The method for early warning and locating faults of wind farm collector lines according to claim 6, characterized in that: The specific process of S2 is: First, ask whether to set the preset parameters. If yes, enter the preset parameter setting interface and set them. The preset parameters include the rated voltage U of the collector line. an , U bn , U cn The line arrester (5) rated allowable leakage current A phase under the operating voltage: [I ' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ], Phase B: [I'bII1, I' bII2 , I' bII3 , ..., I' bIIn ], C phase: [I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ] and delay t0; Otherwise, skip the preset parameter settings and enter delay and sampling.

8. The method for early warning and locating faults of wind farm collector lines according to claim 7, characterized in that: The specific process of S3 is as follows: The delay and sampling are first delayed according to a set value, and then the collected quantities of the capacitive voltage transformer (6), the first current transformer (8) and the second current transformer (7) are collected.

9. The method for early warning and locating faults of wind farm collector lines according to claim 8, characterized in that: The specific process of S4 is as follows: Compare the collected voltage and current with the preset parameters, which correspond to the collector line stopping operation, the collector line normal operation, the arrester insulation abnormality, the collector line lightning fault, and the collector line dancing grounding fault, as follows: Lightning fault of collector line: When max[U a , U b , U c ]>max[U an , U bn , U cn ], and max[I I1 , I I2 , I I3 , ..., I In ]>0, and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that a lightning fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal (10) that a lightning fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then a question is asked whether to sleep. After confirmation, the sleep state is entered. If the above conditions are not met, the system enters S2; Collector line dancing grounding fault: when min[U a , U b , U c ]<min[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]>0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that a dancing grounding fault has occurred in the collector line, and the fault location is at max[I I1 , I I2 , I I3 , ..., I In ], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal (10): a dancing grounding fault occurs in the collector line, and the fault time and fault location are displayed at the same time, and then a question is asked whether to sleep. After confirmation, the sleep state is entered. If the above conditions are not met, the process enters S2; Line arrester insulation abnormality: When max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]>max[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I' bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be judged that the insulation of the collector line arrester is abnormal and the fault location is at max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]], when the synchronous clock is connected, a message is sent to the collector line fault warning and positioning terminal (10): the collector line arrester insulation is abnormal, and the location of the arrester with abnormal insulation is located, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2; Normal operation of the collector line: When [U a , U b , U c ]=[U an , U bn , U cn ] and max[I I1 , I I2 , I I3 , ..., I In ]=0 and max[[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , I bII2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn ]]<min[[I' aII1 , I' aII2 , I' aII3 , ..., I' aIIn ],[I' bII1 , I 'bII2 , I' bII3 , ..., I' bIIn ],[I' cII1 , I' cII2 , I' cII3 , ..., I' cIIn ]], it can be determined that the collector line is operating normally. In the case of access to the synchronous clock, a message is sent to the collector line fault warning and positioning terminal (10) at this time: the collector line is operating normally, and then it is asked whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, it enters S2; the collector line stops running: when [U a , U b , U c ]=0 and [I I1 , I I2 , I I3 , ..., I In ]=0 and [[I aII1 , I aII2 , I aII3 , ..., I aIIn ],[I bII1 , Ib II2 , I bII3 , ..., I bIIn ],[I cII1 , I cII2 , I cII3 , ..., I cIIn When ]]=0, it can be determined that the collector circuit is in a stopped state. At this time, a message is sent to the collector circuit fault warning and positioning terminal (10): the collector circuit stops running, and then asks whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, the first round of circulation ends, and asks whether to sleep. After confirmation, it enters the sleep state. If the above conditions are not met, the first round of circulation ends and enters S2.

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