Method and device for locating valve short-circuit fault in HVDC rectifier station based on actual control and protection recording wave

Abstract

The present invention discloses a method and device for locating a valve short-circuit fault of an HVDC rectifier station based on actual control and protection recording waves. The method comprises: judging the action category of the valve short-circuit protection action information according to the acquired valve short-circuit protection action information of a DC control and protection system; if the action category of the valve short-circuit protection action information is that both the Y-bridge valve short-circuit protection and the D-bridge valve short-circuit protection are activated, determining that the fault position is a 12-pulse converter outlet short circuit; if the valve short-circuit protection is only the Y-bridge valve short-circuit protection action or the D-bridge valve short-circuit protection action, firstly determining whether it is a phase-to-phase short-circuit fault on the converter transformer valve side according to whether the three-phase currents of the Y / D bridge are all 0 at the moment when the Y / D bridge trips the AC incoming line switch; if not, further extracting the Y / D bridge three-phase currents corresponding to different valve conduction stages of the converter after the fault with the help of a converter trigger pulse signal, and locating the valve short-circuit fault in the rectifier side valve area according to the fault characteristics of the three-phase currents of each bridge of the valve short-circuit fault at different positions.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve short-circuit fault analysis, and in particular relates to a method and a device for locating a valve short-circuit fault in an HVDC rectifier station based on actual control and protection recording waves. Background Art

[0002] With the commissioning of many UHV DC projects in my country, various faults occur from time to time. After a fault, experienced operators need to analyze the fault in combination with HVDC control and protection recording waves. The analysis process is cumbersome and time-consuming. Therefore, fast and accurate fault location is of great significance to shorten the maintenance time and improve the efficiency of accident handling. For grounding faults in converter stations, a large number of scholars have theoretically analyzed the fault characteristics of different fault locations at different valve conduction states, classified and summarized the fault characteristics, extracted the inherent characteristics of faults at different locations, and then proposed a grounding fault location solution for converter stations.

[0003] Existing research obtains the current of each bridge arm of the converter, analyzes the characteristics of the current change of each bridge arm measurement point after the valve short-circuit fault at different positions, and integrates the current to obtain quantitative indicators to achieve the location of the valve short-circuit fault at different positions; or based on KCL, analyzes the characteristics of the three-phase current change of each bridge caused by the valve short-circuit fault at different positions during the different valve conduction stages to achieve regional location of the fault. However, it is not easy to obtain the current of each bridge arm in the already put into operation high-voltage DC projects, and the existing method of using bridge arm measurement points cannot be applied to actual projects; and for the method that does not use bridge arm current measurement points, its positioning accuracy needs to be further improved. Summary of the invention

[0004] The present invention provides a method and device for locating a valve short-circuit fault in an HVDC rectifier station based on actual control and protection recording waves, which are used to solve at least one of the above-mentioned technical problems.

[0005] In the first aspect, the present invention provides a method for locating valve short-circuit faults in HVDC rectifier stations based on actual control and protection recording waves, comprising: obtaining valve short-circuit protection action information output by a DC control and protection system, and determining the action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action; if the action category of the valve short-circuit protection action information is a Y-bridge valve short-circuit protection action or a D-bridge valve short-circuit protection action, then obtaining a Y-bridge three-phase current or a D-bridge three-phase current, a Y-bridge trigger pulse or a D-bridge trigger pulse, a real-time trigger angle, and an AC bus switch signal, and determining whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the AC bus switch signal changes from 0 to 1 is both 0; if the AC bus is tripped If the three-phase currents of the Y bridge at the corresponding moment when the switch signal jumps from 0 to 1 are all 0, then the three-phase currents of the Y bridge and the trigger pulses of the Y bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is judged according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions; if the three-phase currents of the D bridge are all 0, then the three-phase currents of the D bridge and the trigger pulses of the D bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is judged according to the three-phase currents of the D bridge in different valve group conduction states after the fault at different positions.

[0006] In a second aspect, the present invention provides a HVDC rectifier station valve short-circuit fault locating device based on actual control protection recording wave, comprising: a valve short-circuit protection action type judgment module, configured to obtain valve short-circuit protection action information output by a DC control protection system, and judge the action category of the valve short-circuit protection action information, wherein the action category includes Y-bridge valve short-circuit protection action and D-bridge valve short-circuit protection action; a signal acquisition module, configured to obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle and the tripping AC bus switch signal if the action category of the valve short-circuit protection action information is the Y-bridge valve short-circuit protection action or the D-bridge valve short-circuit protection action, and judge whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the tripping AC bus switch signal jumps from 0 to 1 are both 0; a first determination module, configured to if the tripping If the three-phase currents of the Y bridge at the corresponding moment when the AC bus switch signal jumps from 0 to 1 are all 0, then the three-phase currents of the Y bridge and the trigger pulses of the Y bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is judged according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions; the second determination module is configured to, if the three-phase currents of the D bridge at the corresponding moment when the AC bus switch signal jumps from 0 to 1 are all 0, then the three-phase currents of the D bridge and the trigger pulses of the D bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is judged according to the three-phase current characteristics of the D bridge in different valve group conduction states after the fault at different positions.

[0007] According to a third aspect, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the steps of the method for locating a valve short-circuit fault in a HVDC rectifier station based on actual control and protection recorded waves according to any embodiment of the present invention.

[0008] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the steps of the method for locating a valve short-circuit fault in a HVDC rectifier station based on actual control and protection recorded waves according to any embodiment of the present invention.

[0009] The HVDC rectifier station valve short-circuit fault locating method and device based on actual control and protection recording wave of the present application realizes fault locating by analyzing the short-circuit current loop of the valve short-circuit fault at different positions in each conduction stage, combining the actual control and protection action situation, and according to the three-phase current change characteristics of the fault bridge corresponding to each conduction stage. The proposed locating method is based on the actual control and protection recording wave data, without adding the bridge arm current measuring point, and verifies the effectiveness of the proposed method on the closed-loop simulation platform composed of RTDS and the actual DC control and protection system, in which the measuring points of the whole system are completely consistent with the actual HVDC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 A flow chart of a method for locating a valve short-circuit fault in an HVDC rectifier station based on actual control and protection recording waves provided in one embodiment of the present invention;

[0012] Figure 2 A schematic diagram of a valve short-circuit fault location in a rectifier station area provided by an embodiment of the present invention;

[0013] FIG. 3( a ) is a diagram of a V Y1 and V Y2 When conducting, V Y3 Short circuit current loop diagram;

[0014] FIG. 3( b ) is a diagram of V provided by an embodiment of the present invention. Y1 and V Y2 When conducting, V Y4 Short circuit current loop diagram;

[0015] FIG. 3( c ) is a diagram of V provided by an embodiment of the present invention. Y1 and V Y2 When conducting, V Y5 Short circuit current loop diagram;

[0016] FIG. 3( d ) is a diagram of V provided by an embodiment of the present invention. Y1 and V Y2 When conducting, V Y6 Short circuit current loop diagram;

[0017] Figure 4 V provided by an embodiment of the present invention Y1 and V Y2 6-pulse converter outlet short-circuit current loop diagram when conducting;

[0018] Figure 5 A structural block diagram of a HVDC rectifier station valve short-circuit fault locating device based on actual control and protection recording waves provided by one embodiment of the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 , which shows a flow chart of a method for locating a valve short-circuit fault in an HVDC rectifier station based on actual control and protection recording waves of the present application.

[0022] like Figure 1 As shown, the method for locating the valve short-circuit fault of the HVDC rectifier station based on the actual control and protection recording wave specifically includes the following steps:

[0023] Step S101, obtaining valve short-circuit protection action information output by a DC control protection system, and determining an action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action.

[0024] In this embodiment, the valve short-circuit protection action information output by the DC control protection system is received. If it is determined according to the action information that the Y-bridge valve short-circuit protection action or the D-bridge valve short-circuit protection action is performed, the process enters step S102. If it is determined according to the action information that both the Y-bridge and D-bridge valve short-circuit protection actions are performed, it is determined to be a 12-pulse converter outlet short-circuit fault. If it is determined that there is no valve short-circuit protection action, the process returns to continue the judgment.

[0025] Step S102, if the action category of the valve short-circuit protection action information is a Y-bridge valve short-circuit protection action or a D-bridge valve short-circuit protection action, obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle and the AC bus switch, and determine whether the Y-bridge three-phase current or the D-bridge three-phase current is 0 at the corresponding moment when the AC bus switch signal changes from 0 to 1.

[0026] In this embodiment, the current I measured by the Y-bridge three-phase current transformer is obtained. YA ,I YB ,I YCOr the current I measured by the D-bridge three-phase current transformer DA ,I DB ,I DC , the control system sends the converter Y bridge trigger pulse PULSE_Y or D bridge trigger pulse PULSE_D, the real-time trigger angle α, the AC bus switch signal OPEN_BREAKER; and determines the current I measured by the Y bridge three-phase current transformer at the corresponding moment when the AC bus switch signal OPEN_BREAKER changes from 0 to 1 YA ,I YB ,I YC Or the current I measured by the D-bridge three-phase current transformer DA ,I DB ,I DC Are they all 0? If any of them are not 0, it is determined to be a phase-to-phase short circuit fault on the AC side of the Y bridge K1 Y Or D bridge AC side phase short circuit fault K1 D , if all are 0, go to step S103.

[0027] Step S103, if the three-phase currents of the Y bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, then the three-phase current of the Y bridge and the Y bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase current of the Y bridge in different valve group conduction states after the fault is extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions.

[0028] In this embodiment, the data that can be used for fault location is determined based on the acquired real-time trigger angle α data, that is, the Y-bridge three-phase current I corresponding to the period from the start of the fault to the trigger angle α < 30° is taken. YA ,I YB ,I YC , and combined with the Y bridge trigger pulse PULSE_Y to extract the three-phase current of the Y bridge in different valve group conduction states after the fault. If the extracted conduction state is S1 Y (V Y1 、V Y2 conduction), then enter step E1, if the extracted conduction state is S2 Y (V Y3 、V Y2 conduction), then enter step E2, if the extracted conduction state is S3 Y (V Y3 、V Y4 conduction), then enter step E3, if the extracted conduction state is S4 Y (V Y5 、V Y4 conduction), then enter step E4, if the extracted conduction state is S5 Y (VY5 、V Y6 conduction), then enter step E5, if the extracted conduction state is S6 Y (V Y1 、V Y6 If the power supply is turned on, go to step E6.

[0029] It should be noted that the reason why the data from the start of the fault to the real-time trigger angle α < 30° is used in this embodiment is to avoid the problem that after the DC control system detects an abnormal increase in the fault current, it increases α to maintain the current constant, thereby causing the fault characteristics to disappear.

[0030] It should be noted that E1: Judgment I YA or I DA (Abbreviated as I Y / DA ) Whether three consecutive sampling points meet I Y / DA >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D6 A valve short circuit fault (K26) occurs. If so, continue to judge I Y / DB Do three consecutive sampling points satisfy I Y / DB >-1.15pu, if yes, it is determined to be a Y / D bridge arm V Y / D3 A valve short circuit fault occurs (K23). If not, determine whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, determine that the fault location is the Y / D bridge arm V Y / D4 (K24) or V Y / D5 (K25) or the Y / D bridge 6 pulsation converter outlet (K3) has a valve short circuit fault. If the change occurs, continue to judge I Y / DA Do three consecutive sampling points satisfy I Y / DA >1.15pu, if yes, it is determined to be a Y / D bridge arm V Y / D4 A valve short circuit fault occurs. If not, it is determined to be V Y / D5 (K25) or a valve short circuit fault occurs at the outlet (K3) of the Y / D bridge 6 pulsation converter;

[0031] E2: Judgment I YB or I DB (Abbreviated as I Y / DB ) Whether three consecutive sampling points meet I Y / DB >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D4 A valve short circuit fault (K24) occurs. If so, continue to judge I Y / DA Do three consecutive sampling points satisfy I Y / DA >-1.15pu, if yes, it is determined to be a Y / D bridge arm V Y / D1A valve short circuit fault occurs (K21). If not, determine whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, determine that the fault location is the Y / D bridge arm V Y / D5 (K25) or V Y / D6 (K26) or a short-circuit fault occurs at the outlet of the Y / D bridge 6 pulsating converter (K3). If a change occurs, continue to determine whether IY / DA meets I for three consecutive sampling points. Y / DA >-1.15pu, if yes, it is determined to be a Y / D bridge arm V Y / D5 A valve short circuit fault (K25) occurs. If not, it is determined to be V Y / D6 (K26) or a valve short circuit fault occurs at the outlet (K3) of the Y / D bridge 6 pulsation converter;

[0032] E3: Judgment I YA or IDA (abbreviated as I Y / DA ) Whether three consecutive sampling points meet I Y / DA >-1.15pu, if not, it is determined to be Y / D bridge arm V Y / D5 A valve short circuit fault occurs (K25). If so, continue to judge I Y / DB Do three consecutive sampling points satisfy I Y / DB >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D2 A valve short circuit fault (K22) occurs. If so, determine whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, determine that the fault location is the Y / D bridge arm V Y / D1 (K21) or V Y / D6 (K26) or the Y / D bridge 6 pulsation converter outlet (K3) has a valve short circuit fault. If the change occurs, continue to judge I Y / DC Do three consecutive sampling points satisfy I Y / DC >0pu, if so, it is determined to be a Y / D bridge arm V Y / D6 A valve short circuit fault (K26) occurs. If not, it is determined to be V Y / D1 (K21) or a valve short circuit fault occurs at the outlet (K3) of the Y / D bridge 6 pulsation converter;

[0033] E4: Judgment I YC or I DC (Abbreviated as I Y / DC ) Whether three consecutive sampling points meet I Y / DC >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D6 A valve short circuit fault (K26) occurs. If so, continue to judge I Y / DA Do three consecutive sampling points satisfy I Y / DA>-1.15pu, if not, it is determined to be Y / D bridge arm V Y / D3 A valve short circuit fault (K23) occurs. If so, determine whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, determine that the fault location is the Y / D bridge arm V Y / D1 (K21) or V Y / D2 (K22) or the Y / D bridge 6 pulsation converter outlet (K3) has a valve short circuit fault. If the change occurs, continue to judge I Y / DB Do three consecutive sampling points satisfy I Y / DB >-1.15pu, if yes, it is determined to be a Y / D bridge arm V Y / D1 A valve short circuit fault (K21) occurs. If not, it is determined to be V Y / D2 (K22) or a valve short circuit fault occurs at the outlet (K3) of the Y / D bridge 6 pulsation converter;

[0034] E5: Judgment I YC or I DC (Abbreviated as I Y / DC ) Whether three consecutive sampling points meet I Y / DC >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D4 A valve short circuit fault (K24) occurs. If so, continue to judge I Y / DB Do three consecutive sampling points satisfy I Y / DB >-1.15pu, if not, it is determined to be Y / D bridge arm V Y / D1 A valve short circuit fault (K21) occurs, and if not, it is determined whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, it is determined that the fault location is the Y / D bridge arm V Y / D2 (K22) or V Y / D3 (K23) or the Y / D bridge 6 pulsation converter outlet (K3) has a valve short circuit fault. If the change occurs, continue to judge I Y / DA Do three consecutive sampling points satisfy IY / DA>0pu? If so, it is determined to be a Y / D bridge arm V Y / D2 A valve short circuit fault (K22) occurs. If not, it is determined to be V Y / D3 (K23) or a valve short circuit fault occurs at the outlet (K3) of the Y / D bridge 6 pulsation converter;

[0035] E6: Judgment I YA or I DA (Abbreviated as I Y / DA ) Whether three consecutive sampling points meet I Y / DA >1.15pu, if not, it is determined to be a Y / D bridge arm V Y / D2 A valve short circuit fault (K22) occurs. If so, continue to judge IY / DB Do three consecutive sampling points satisfy I Y / DB >-1.15pu, if not, it is determined to be Y / D bridge arm V Y / D5 A valve short circuit fault (K25) occurs. If so, determine whether the PULSE_Y / D corresponding to the data taken after the fault changes, that is, the valve conduction state switches. If not, determine that the fault location is the Y / D bridge arm V Y / D3 (K23) or V Y / D4 (K24) or the Y / D bridge 6 pulsation converter outlet (K3) has a valve short circuit fault. If the change occurs, continue to judge I Y / DC Do three consecutive sampling points satisfy I Y / DC <0pu, if yes, it is determined to be a Y / D bridge arm V Y / D3 A valve short circuit fault (K23) occurs. If not, it is determined to be V Y / D4 (K24) or a valve short circuit fault occurs at the outlet of the Y / D bridge 6 pulsation converter (K3).

[0036] Step S104, if the three-phase currents of the D bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, then the three-phase currents of the D bridge and the D bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the D bridge in different valve group conduction states after the fault at different positions.

[0037] In this embodiment, the data that can be used for fault location is determined based on the acquired real-time trigger angle α data, that is, the D bridge three-phase current I corresponding to the period from the start of the fault to the trigger angle α < 30° is taken. DA ,I DB ,I DC , and combined with the D-bridge trigger pulse PULSE_D to extract the three-phase current of the D-bridge in different valve group conduction states after the fault. If the extracted conduction state is S1 D (V Y1 、V Y2 conduction), then enter step E1, if the extracted conduction state is S2 D (V Y3 、V Y2 conduction), then enter step E2, if the extracted conduction state is S3 D (V Y3 、V Y4 conduction), then enter step E3, if the extracted conduction state is S4 D (V Y5 、V Y4 conduction), then enter step E4, if the extracted conduction state is S5 D (VY5 、V Y6 conduction), then enter step E5, if the extracted conduction state is S6 D (V Y1 、V Y6 If the power supply is turned on, go to step E6.

[0038] In summary, the method of the present application analyzes the short-circuit current loop of the valve short-circuit fault at different positions in different conduction stages, obtains the three-phase current change characteristics of the fault bridge at different positions in different conduction stages, and realizes the location of the valve short-circuit fault in the valve area of ​​the rectifier station in combination with the actual control and protection action. The proposed positioning method is based on the actual control and protection recording data, without adding bridge arm current measurement points, and verifies the effectiveness of the proposed method on a closed-loop simulation platform consisting of an RTDS and an actual DC control and protection system, where the measurement points of the entire system are completely consistent with the actual HVDC system.

[0039] like Figure 2 As shown, it shows four typical valve short-circuit fault locations in the rectifier station area of ​​the present application, mainly including the phase-to-phase short circuit on the valve side of the Y / D bridge converter (K 1Y / D ), Y / D bridge 6 pulse converter bridge arm short circuit (K 2Y / D ), Y / D bridge 6-pulse converter outgoing line short circuit (K 3Y / D ) and 12-pulse converter outgoing line short circuit K4.

[0040] In a specific embodiment, FIG. 3- Figure 4 Given a Y bridge S 1Y (V Y1 、V Y2 ) The current loop of the short-circuit fault of valves at different positions in the on state, wherein FIG3 is the current loop of the short-circuit of each bridge arm of the Y bridge, Figure 4 The outgoing line of the Y bridge 6 pulsation converter is short-circuited.

[0041] See also Figure 5 , which shows a structural block diagram of a HVDC rectifier station valve short-circuit fault locating device based on actual control protection recording waves of the present application.

[0042] like Figure 5 As shown, the HVDC rectifier station valve short-circuit fault locating device 200 includes a valve short-circuit protection action type judgment module 210, a signal acquisition module 220, a first determination module 230 and a second determination module 240.

[0043] Among them, the valve short-circuit protection action type judgment module 210 is configured to obtain the valve short-circuit protection action information output by the DC control protection system, and judge the action category of the valve short-circuit protection action information, wherein the action category includes Y-bridge valve short-circuit protection action and D-bridge valve short-circuit protection action; the signal acquisition module 220 is configured to obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle and the AC bus switch signal if the action category of the valve short-circuit protection action information is the Y-bridge valve short-circuit protection action or the D-bridge valve short-circuit protection action, and judge whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the AC bus switch signal jumps from 0 to 1 is both 0; the first determination module 230 is configured to determine whether the AC bus switch signal jumps from 0 to 1 if the AC bus switch signal jumps from 0 to 1 If the three-phase currents of the Y bridge at the corresponding moment are all 0, the three-phase currents of the Y bridge and the trigger pulses of the Y bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is judged according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions; the second determination module 240 is configured to, if the three-phase currents of the D bridge at the corresponding moment when the AC bus switch signal jumps from 0 to 1 are all 0, then the three-phase currents of the D bridge and the trigger pulses of the D bridge corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is judged according to the three-phase current characteristics of the D bridge in different valve group conduction states after the fault at different positions.

[0044] It should be understood that Figure 5 Modules and references documented in Figure 1 Therefore, the operations and features described above for the method and the corresponding technical effects are also applicable to Figure 5 The modules in it will not be described in detail here.

[0045] In some other embodiments, the embodiments of the present invention further provide a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the HVDC rectifier station valve short circuit fault locating method based on actual control protection recorded waves in any of the above method embodiments;

[0046] As an implementation mode, the computer-readable storage medium of the present invention stores computer-executable instructions, and the computer-executable instructions are configured as follows:

[0047] Acquire valve short-circuit protection action information output by the DC control protection system, and determine the action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action;

[0048] If the action category of the valve short-circuit protection action information is a Y-bridge valve short-circuit protection action or a D-bridge valve short-circuit protection action, obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle, and the AC bus switch signal, and determine whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the AC bus switch signal changes from 0 to 1 is both 0;

[0049] If the three-phase currents of the Y bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, then the three-phase currents of the Y bridge and the Y bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions;

[0050] If the three-phase currents of the D-bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, the three-phase currents of the D-bridge and the D-bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D-bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is determined according to the three-phase current characteristics of the D-bridge in different valve group conduction states after the fault at different positions.

[0051] The computer-readable storage medium may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the HVDC rectifier station valve short-circuit fault locating device based on the actual control and protection recording wave, etc. In addition, the computer-readable storage medium may include a high-speed random access memory, and may also include a memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the HVDC rectifier station valve short-circuit fault locating device based on the actual control and protection recording wave via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0052] Figure 6 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention, such as Figure 6 As shown, the device includes: a processor 310 and a memory 320. The electronic device may also include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330 and the output device 340 may be connected via a bus or other means. Figure 6In the example, the bus connection is used. The memory 320 is the above-mentioned computer-readable storage medium. The processor 310 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 320, that is, the HVDC rectifier station valve short-circuit fault locating method based on the actual control protection recording wave of the above-mentioned method embodiment is realized. The input device 330 can receive input digital or character information, and generate key signal input related to the user setting and function control of the HVDC rectifier station valve short-circuit fault locating device based on the actual control protection recording wave. The output device 340 may include a display device such as a display screen.

[0053] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0054] As an implementation mode, the electronic device is applied to a HVDC rectifier station valve short-circuit fault locating device based on actual control and protection recording waves, and is used for a client, and includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

[0055] Acquire valve short-circuit protection action information output by the DC control protection system, and determine the action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action;

[0056] If the action category of the valve short-circuit protection action information is a Y-bridge valve short-circuit protection action or a D-bridge valve short-circuit protection action, obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle, and the AC bus switch signal, and determine whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the AC bus switch signal changes from 0 to 1 is both 0;

[0057] If the three-phase currents of the Y bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, then the three-phase currents of the Y bridge and the Y bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions;

[0058] If the three-phase currents of the D-bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, the three-phase currents of the D-bridge and the D-bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D-bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is determined according to the three-phase current characteristics of the D-bridge in different valve group conduction states after the fault at different positions.

[0059] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for locating valve short-circuit faults in HVDC rectifier stations based on actual control and protection recording waves, characterized in that: include: Acquire valve short-circuit protection action information output by the DC control protection system, and determine the action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action; If the action category of the valve short-circuit protection action information is a Y-bridge valve short-circuit protection action or a D-bridge valve short-circuit protection action, obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle, and the AC bus switch signal, and determine whether the Y-bridge three-phase current or the D-bridge three-phase current at the corresponding moment when the AC bus switch signal changes from 0 to 1 is both 0; If the three-phase currents of the Y bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, the three-phase currents of the Y bridge and the Y bridge trigger pulse between the start of the fault and the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the Y bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the Y bridge in different valve group conduction states after the fault at different positions; If the three-phase currents of the D-bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, the three-phase currents of the D-bridge and the D-bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° are obtained, and the three-phase currents of the D-bridge in different valve group conduction states after the fault are extracted by combining the two, and the valve short-circuit fault position is determined according to the three-phase current characteristics of the D-bridge in different valve group conduction states after the fault at different positions.

2. A method for locating valve short-circuit faults in HVDC rectifier stations based on actual control and protection recording waves according to claim 1, characterized in that: After determining whether the three-phase currents of the Y bridge at the time corresponding to the change of the AC bus switch signal from 0 to 1 are all 0, the method further includes: If the three-phase currents of the Y-bridge are not all 0, it is determined that there is a phase-to-phase short circuit fault on the AC side of the Y-bridge converter.

3. The method for locating valve short-circuit faults in HVDC rectifier stations based on actual control and protection recording waves according to claim 1 is characterized in that: After determining whether the three-phase currents of the D bridge at the corresponding moment when the AC bus switch signal changes from 0 to 1 are all 0, the method further includes: If the three-phase currents of the D bridge are not all 0, it is determined that there is a phase-to-phase short circuit fault on the AC side of the D bridge converter.

4. A method for locating valve short-circuit faults in HVDC rectifier stations based on actual control and protection recording waves according to claim 1, characterized in that: After obtaining the valve short-circuit protection action information output by the DC control protection system and determining the action category of the valve short-circuit protection action information, the method further includes: If the action type of the valve short-circuit protection action information is that both the Y-bridge and D-bridge valve short-circuit protections are activated, it is determined that a short-circuit fault occurs in the 12-pulse converter.

5. A HVDC rectifier station valve short-circuit fault location device based on actual control and protection recording wave, characterized in that: include: a valve short-circuit protection action type judgment module, configured to obtain valve short-circuit protection action information output by the DC control protection system, and judge the action category of the valve short-circuit protection action information, wherein the action category includes a Y-bridge valve short-circuit protection action and a D-bridge valve short-circuit protection action; The signal acquisition module is configured to obtain the Y-bridge three-phase current or the D-bridge three-phase current, the Y-bridge trigger pulse or the D-bridge trigger pulse, the real-time trigger angle and the AC bus switch signal if the action category of the valve short-circuit protection action information is the Y-bridge valve short-circuit protection action or the D-bridge valve short-circuit protection action, and determine whether the Y-bridge three-phase current or the D-bridge three-phase current is 0 at the corresponding moment when the AC bus switch signal changes from 0 to 1; The first determination module is configured to obtain the Y-bridge three-phase current and Y-bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° if the three-phase currents of the Y-bridge at the corresponding moment when the AC bus switch signal jumps from 0 to 1 are all 0, and the three-phase current of the Y-bridge and the Y-bridge trigger pulse corresponding to the fault start to the real-time trigger angle being less than 30° are obtained, and the three-phase current of the Y-bridge in different valve group conduction states after the fault is extracted by combining the two, and the valve short circuit fault position is determined according to the three-phase current characteristics of the Y-bridge in different valve group conduction states after the fault at different positions; The second determination module is configured to obtain the D-bridge three-phase current and D-bridge trigger pulse corresponding to the start of the fault to the real-time trigger angle being less than 30° if the three-phase currents of the D-bridge at the corresponding moment when the AC bus switch signal jumps from 0 to 1 are all 0, and combine the two to extract the three-phase current of the D-bridge in different valve group conduction states after the fault, and determine the valve short-circuit fault location according to the three-phase current characteristics of the D-bridge in different valve group conduction states after the fault at different positions.

6. An electronic device, characterized in that: include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

Images