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Single-phase arc high-resistance ground fault location method for wind farm current collection lines

A high-resistance grounding fault and current-collecting line technology, applied in the fault location, detecting faults according to conductor types, measuring electricity, etc., can solve problems such as no longer applicable, and achieve the effect of fast convergence speed and high ranging accuracy.

Inactive Publication Date: 2019-09-20
TSINGHUA UNIV
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Problems solved by technology

However, in this invention, the fault branch is simplified to a pure resistance branch, which is no longer applicable when an arc high-resistance grounding fault occurs on the line.

Method used

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  • Single-phase arc high-resistance ground fault location method for wind farm current collection lines
  • Single-phase arc high-resistance ground fault location method for wind farm current collection lines
  • Single-phase arc high-resistance ground fault location method for wind farm current collection lines

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Embodiment Construction

[0027] The present invention proposes a single-phase arc light high-resistance grounding fault distance measurement method for a wind farm collector line, and the embodiments are described in detail as follows:

[0028] The doubly-fed wind farm model applying the method of the present invention is as figure 1 As shown, the length of the collector line is 8km, and the line parameter values ​​are shown in Table 1. A total of four 1.5MW double-fed wind turbines are connected to the power collection line. The distance between every two wind turbines on the power collection line is 2km. Therefore, the wind farm power collection line is divided into 4 sections, each section is 2km long. The fault distance measuring device using the method of the invention measures the bus voltage and the current value at the outlet of the collector line through a voltage transformer (PT) and a current transformer (CT). suppose figure 1 A single-phase ground fault occurs at the middle point A of th...

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Abstract

The invention discloses a single-phase arc high-resistance ground fault location method for wind farm current collection lines. The method includes measuring the fault phase voltage, phase current, and zero sequence current after 20ms failure of the protection installation place of a current collection line outlet of a wind farm as input; solving the fault current of each fan branch based on the principle of equipartition; fitting with the fault branch current by utilizing the zero sequence current at the current collection line outlet of the wind farm; solving the voltage drop of the fault branches by combining a logarithmic arc model; writing a time domain voltage loop equation between the current collection line outlet and a grounding point based on the topological structure of the current collection line; assuming a fault section initial value, and adopting a damped least square method to perform nonlinear fitting solution on a range finding equation; piecewise calculating fault distances; and finishing searching when the calculated fault distance value is located at the assumed fault section so that the calculated fault distance value at this moment is a range finding results. The method can be directly applied to standard configuration fault recorders of transformer stations without installing new measurement equipment, so that the method is low in cost and fast in algorithm convergence speed.

Description

technical field [0001] The invention belongs to the field of fault detection and protection of electric power systems, and in particular relates to a single-phase arc light high-resistance grounding fault ranging method of a wind farm collector line. Background technique [0002] With the rapid development of wind power generation, the penetration rate of wind power in the power system continues to increase, and the impact of wind farm failure on the safe and stable operation of the system is also increasing. Most of the sites for wind farms are located in poor locations. Affected by factors such as the natural environment, the probability of single-phase ground faults in the collector lines is high, and arc high-resistance ground faults such as cable head breakdown and tree barriers often occur. It is difficult to locate faults manually. Seriously restrict the safe and economical operation of wind power generation. Therefore, the distance measurement of single-phase arc hi...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/085G01R31/50Y04S10/52
Inventor 王宾任萱
Owner TSINGHUA UNIV
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