CN115542077A - Interphase fault multi-terminal ranging method based on wind power plant collecting line and box transformer substation parameters - Google Patents
Interphase fault multi-terminal ranging method based on wind power plant collecting line and box transformer substation parameters Download PDFInfo
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- CN115542077A CN115542077A CN202211104470.3A CN202211104470A CN115542077A CN 115542077 A CN115542077 A CN 115542077A CN 202211104470 A CN202211104470 A CN 202211104470A CN 115542077 A CN115542077 A CN 115542077A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses an interphase fault multi-terminal ranging method based on wind power plant current collecting lines and box transformer substation parameters, belongs to the field of power system transmission engineering, and is mainly applied to rapid fault positioning and overhauling work of the current collecting lines in a wind power plant. The invention models the collecting line according to the model of the collecting line and the parameters of the box transformer substation, determines the line impedance between each adjacent element, calculates the voltage distribution of the T joint of each element of the whole collecting line through the transient current and voltage of each element, determines that the fault point is positioned between two fans or between the head end of the line and the first fan, solves and determines the impedance of the adjacent element at the fault point according to the transient voltage and current at the low voltage side of the fan box transformer substation and the head end of the line, and further achieves the purpose of determining the position of the fault point.
Description
Technical Field
The invention relates to an interphase fault multi-terminal ranging method based on wind power plant current collection lines and box transformer substation parameters, belongs to the field of power transmission engineering of power systems, and is mainly applied to rapid positioning and overhauling work of the current collection lines in the wind power plant of a wind power generation enterprise.
Background
In recent years, both installed capacity and power generation of wind power generation have been increasing year by year. The current collecting line of the wind power plant is large in distribution area and severe in environment, so that faults of the current collecting line occur frequently, and after the current collecting line fails, the current collecting line needs to be patrolled to determine a fault point. The length of the current collecting line is generally 5-15 km, and the power failure time and the field workload of the current collecting line are greatly increased by line patrol work after a fault. In order to ensure the economic operation of the wind power plant, attention must be paid to the rapid investigation and repair work after an accident. The fault location technology for the transmission line of the wind power plant is one of important measures for technically ensuring the safe, reliable and economic operation of the wind power plant.
Accurate fault location can alleviate the burden of patrolling the line, reduces economic loss. Accurate fault location can reduce the maintenance personal and patrol the time of line inspection for the recovery of circuit reduces because of the economic loss that the power failure caused. The existing current collecting line distance measuring method is single-end distance measuring, when a current collecting line is short-circuited through a transition resistor or line parameters are inaccurate, the distance measuring error is large, and the field application effect is poor. Therefore, an accurate fault location method for the current collecting line is required.
Disclosure of Invention
The invention aims to deal with interphase faults generated by a power transmission line of a wind power plant, the position of a fault position in a current collecting line is obtained through related electrical quantity, and an interphase fault multi-terminal distance measuring method based on the current collecting line and box transformer substation parameters of the wind power plant is provided, so that the specific position of a fault point can be accurately judged.
The technical scheme adopted by the invention for solving the problems is as follows: an interphase fault multi-terminal ranging method based on wind power plant collecting line and box transformer substation parameters is characterized in that impedance parameters are determined according to the type of the collecting line and the box transformer substation parameters, and modeling is carried out on the collecting line; transient fault information is collected and uploaded to a master station end; and the master station end determines the position of a fault point and the transition resistance of the fault point by calculating the voltage distribution of the full-integrated circuit and solving a transient equation according to the acquired fault information quantity.
Further, determining the impedance from the T contact of the first fan to the main station side line according to the model parameters of the current collecting line and the positions of all fans; determining the line impedance between two adjacent fans according to the model parameters of the current collecting line and the positions of the two adjacent fans; and determining the impedance from the box transformer to the T joint according to the nameplate parameter of the box transformer and the down-lead parameter of the T joint section of the box transformer. And modeling the collector line and the connecting box transformer thereof according to the impedance, and determining the impedance among the elements.
Further, after the current collecting line fails, collecting transient voltage and current vectors of the line and all fans and transient current and voltage vectors of the current collecting line on the master station side; the collected voltage and current vectors are transmitted to the main station through a communication channel between the fan and the main station; the synchronization of different sampling points depends on the synchronization of the field station clock. The main station side determines the voltage distribution (U) of each T contact and the line head end of the full-power-collecting line according to the transient voltage and current of each element of the same time interval s ，U k +I k Z k ) The fault point is located between the two nodes with the lowest voltage.
Furthermore, if the main station calculates the voltage distribution of the full-collecting line through transient voltage and current vectors of all box-type transformers, the fault point is determined to be located between two adjacent T-joint points of the fan. The current of the front side line of the fault point can be obtained by accumulating the current of the head end and the current of each fan in front of the fault point, namely I sk (ii) a The rear side current is the result of the accumulation of the fan currents after the fault point, i.e. I fk . The transient current and voltage of the two fans can be directly collected, namely U k 、I k 、U k-1 、I k-1 . Fan box becomes and connects and drawsLine impedance (Z) k ) And impedance (Δ Z) between two fan T-junctions k ) Are modeling parameters. And solving a transient equation to determine the line parameters and the transition resistance to the master station side, so as to obtain the position of the fault point.
Further, the master station may determine that the fault point is located between the line head end and the first fan T junction by calculating the voltage distribution of the full power distribution line, for example. The current from the fault point to the T-joint of the typhoon is obtained by the current accumulation of all the fans, i.e. I f1 (ii) a The current from fault point to main transformer side is the transient current of current collecting circuit, i.e. I s . The transient current and voltage of the first fan and the head end of the line can be directly collected, namely U s 、I s 、U 1 、I 1 . Fan box transformer and lead impedance (Z) 1 ) And the impedance (Delta Z) between the T joint of the first fan and the main transformer side 1 ) Are modeling parameters. And solving a transient equation to determine the line parameters from the fault point to the main station side and the size of the transition resistance, so as to obtain the position of the fault point.
Compared with the prior art, the invention has the following advantages and effects: the invention models the current collection circuit according to the model of the current collection circuit and the parameters of the box transformer substation, determines the impedance of the circuit between each adjacent element, calculates the voltage distribution of the T joint of each element of the whole current collection circuit through the transient current and voltage of each element, determines that the fault point is positioned between two fans or between the head end of the circuit and the first fan, solves and determines the impedance of the fault point away from the adjacent element according to the transient voltage and current of the low voltage side of the fan box transformer substation and the head end of the circuit, and can accurately judge the specific position of the fault point.
Drawings
Fig. 1 is a schematic diagram of a multi-terminal ranging method for phase-to-phase faults in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
In this embodiment, the interphase fault multi-terminal ranging method based on the parameters of the wind power plant collecting line and the box transformer substation includes the following processes:
determining impedance parameters according to the type of the current collection circuit and box transformer substation parameters, and modeling the current collection circuit; transient fault information is collected and uploaded to a master station end; and the master station end determines the position of a fault point and the transition resistance of the fault point by calculating the voltage distribution of the full-integrated circuit and solving a transient equation according to the acquired fault information quantity.
Determining the impedance of a line from a T contact point of a first fan to a main station side according to the model parameters of a current collecting line and the positions of all fans; determining the line impedance between two adjacent fans according to the model parameters of the current collecting line and the positions of the two adjacent fans; and determining the impedance from the box transformer to the T joint according to the nameplate parameter of the box transformer and the down-lead parameter of the T joint of the box transformer. And modeling the collector line and the connecting box transformer thereof according to the impedance, and determining the impedance among the elements. As shown in fig. 1, i.e. determining Δ Z k (including. DELTA.Z 1 ) Impedance.
After the current collection line has a fault, collecting transient voltage and current vectors of the line and all fans and transient current and voltage vectors of the current collection line on the master station side; the collected voltage and current vectors are transmitted to the main station through a communication channel between the fan and the main station; the synchronization of different sampling points depends on the synchronization of the field station clock. The main station side determines the voltage distribution (U) of each T contact and the line head end of the full-power-collecting line according to the transient voltage and current of each element of the same time interval s ，U k +I k Z k ) The fault point is located between the two nodes with the lowest voltage. As shown in fig. 1, i.e. the point of failure is determined to be between two fan T-junctions or between the head end of the line and the first fan T-junction.
If the main station calculates the voltage distribution of the full-power-collecting line through transient voltage and current vectors of the box transformers, the fault point is determined to be located between two adjacent T-joint points of the fan. As shown in FIG. 1, the front-side line current of the fault point can be obtained by adding the head-end current and the current of each fan in front of the fault point, i.e. I sk (ii) a The rear side current is the result of the accumulation of the fan currents after the fault point, i.e. I fk . The transient current and voltage of the two fans can be directly collected, namely U k 、I k 、U k-1 、I k-1 . Fan box transformer and lead impedance (Z) k ) And impedance (Δ Z) between two fan T-junctions k ) Are modeling parameters. And solving a transient equation to determine the line parameters and the transition resistance of the master station side, so as to obtain the position of the fault point.
If the main station can determine that the fault point is positioned between the head end of the line and the T joint of the first fan by calculating the voltage distribution of the full-power-collecting line. As shown in FIG. 1, the current from the fault point to the T-junction of the typhoon is obtained by adding the currents of all the fans, i.e. I f1 (ii) a The current from fault point to main transformer side is the transient current of current collecting circuit, i.e. I s . The transient current and voltage of the first fan and the head end of the line can be directly collected, namely U s 、I s 、U 1 、I 1 . Fan box transformer and lead impedance (Z) 1 ) And the impedance (Delta Z) between the T joint of the first fan and the main transformer side 1 ) Are modeling parameters. And solving a transient equation to determine the line parameters from the fault point to the main station side and the size of the transition resistance, so as to obtain the position of the fault point.
When a power transmission line of a certain wind power plant fails, parameters of a fault line part are shown in figure 1.
When the fault point is positioned on the fan F k And F k-1 And through a transition resistance R k When the fault occurs, the main station determines that the fault point is positioned at the adjacent F through calculating the voltage distribution of the full-power-collecting line k And F k-1 Between two fans, then calculate T contact department voltage, the transient equation satisfies:
simultaneous determination of Z fk 、Z sk 、R k Determining the location of the fault point and the transition resistance R k 。
Wherein:
ΔZ k is a fan F k To the fan F k-1 Per unit value of impedance between the T-junctions;
Z fk is a fan F k Of (D) a T-junctionPer unit value of impedance to fault point;
Z sk is a fan F k-1 Per unit value of impedance between the T-junction and the fault point;
R k the per unit value of the transition resistance of the fault point;
Z k is a fan F k The impedance per unit of the box transformer and the impedance per unit from the lead wire to the T joint;
Z k-1 is a fan F k-1 The impedance per unit of the box transformer and the impedance per unit from the lead wire to the T joint;
U k is a fan F k Per unit value of the low-voltage side transient voltage;
U k-1 is a fan F k-1 Per unit value of the low-voltage side transient voltage;
I k is a fan F k Per unit value of the low-voltage side transient current;
I k-1 is a fan F k-1 Per unit value of the low-voltage side transient current;
I fk is a fan F k Per unit value of fault current of the conductor from the T contact to the fault point;
I sk is a fan F k-1 Per unit value of the fault current of the conductor from the T joint to the fault point;
I s is the per unit value of the transient current of the head end of the line.
When the fault point is located between line head end and the first typhoon machine, main website is through calculating the distribution of full collection line voltage, confirms that the fault point is located between line head end and the first typhoon machine of this end, calculates T contact department voltage, and the transient equation satisfies:
zf1, zs1 and R1 can be obtained simultaneously, and the position of the fault point is determined.
Wherein:
ΔZ 1 is a fan F 1 Per unit value of impedance between the T joint and the main transformer side;
Z f1 is a fan F 1 Per unit value of impedance between the T-junction and the fault point;
Z s1 the per unit value of the impedance between the main transformer side and the fault point is obtained;
R 1 the per unit value of the transition resistance of the fault point is obtained;
Z 1 is a fan F 1 The impedance per unit of the box transformer and the impedance per unit from the lead wire to the T joint;
Z s the per unit value of the impedance from the main transformer side to the T contact is obtained;
U 1 is a fan F 1 Per unit value of the low-voltage side transient voltage;
I 1 is a fan F 1 Per unit value of the low-voltage side transient current;
I f1 is a fan F 1 Per unit value of fault current of the conductor from the T contact to the fault point;
U s the per unit value of the transient voltage of the low-voltage side of the main transformer is obtained;
I s 、I s1 and the transient current per unit value of the head end of the line is obtained.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. An interphase fault multi-terminal ranging method based on wind power plant collecting line and box transformer substation parameters is characterized in that impedance parameters are determined according to the collecting line and box transformer substation parameters, and a collecting line is modeled; determining the impedance from the T contact of the first fan at the head end to the main station side line according to the type number parameter of the collecting line and the position of the first fan at the head end; determining the line impedance between two adjacent fans according to the model parameters of the current collecting line and the positions of the two adjacent fans; determining impedance from the box transformer substation to a T joint according to the nameplate parameter of the box transformer substation and the down-lead parameter of the T joint section of the box transformer substation; modeling a current collection circuit and a connecting box transformer substation thereof according to the impedance, and determining the impedance among the elements; transient fault information is collected and uploaded to a main station end, and the main station end determines the position of a fault point and the size of a fault point transition resistance by calculating the voltage distribution of a full-integrated circuit and solving a transient equation according to the collected fault information.
2. The multi-terminal phase-to-phase fault distance measurement method based on the wind power plant collecting line and box transformer substation parameters is characterized in that after the collecting line fails, transient voltages and current vectors of the line and all fans and transient currents and voltage vectors of a main station side collecting line are collected, and the collected voltages and current vectors are transmitted to a main station through a communication channel between the fans and the main station; the synchronization of different sampling points depends on the synchronization of a station clock, the master station side determines the voltage distribution of each T joint and the line head end of the full-integrated circuit according to the transient voltage and current of each element of the same time interval, and the fault point is positioned between two nodes with the lowest voltage.
3. The inter-phase fault multi-terminal ranging method based on wind power plant collection lines and box transformer substation parameters according to claim 2 is characterized in that when a master station calculates voltage distribution of a full collection line through transient voltage and current vectors of each box transformer substation and determines that a fault point is located between two adjacent fan T-joint points; the current of the front side line of the fault point is obtained by accumulating the current of the front end of the fault point and the current of each fan in front of the fault point, and the current of the rear side line of the fault point is the accumulated result of the current of each fan behind the fault point; transient currents and voltages of the two fans can be directly collected; and solving a transient equation according to the modeling parameters, and determining the parameters of the line from the fault point to the main station side and the magnitude of the transition resistance to obtain the position of the fault point.
4. The wind farm power collection line and box transformer parameter based phase-to-phase fault multi-terminal ranging method according to claim 2, characterized in that when a master station determines that a fault point is located between a line head end and a first fan T contact point by calculating voltage distribution of a full power collection line; the current from the fault point to the T joint of the typhoon is obtained by accumulating the currents of all the fans, and the current from the fault point to the main transformer side is the transient current of a current collection circuit; transient current and voltage of the first fan and the head end of the line can be directly acquired; and according to the modeling parameters, solving a transient equation to determine the parameters of the line from the fault point to the master station side and the size of the transition resistance, and obtaining the position of the fault point.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269664A (en) * | 2023-08-18 | 2023-12-22 | 国家电网有限公司华东分部 | Positioning method and device for line fault points of wind power plant and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269664A (en) * | 2023-08-18 | 2023-12-22 | 国家电网有限公司华东分部 | Positioning method and device for line fault points of wind power plant and electronic equipment |
| CN117269664B (en) * | 2023-08-18 | 2024-05-03 | 国家电网有限公司华东分部 | Positioning method and device for line fault points of wind power plant and electronic equipment |
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