Wind power plant current collection line reclosing method based on wireless differential protection

Abstract

The invention discloses a wind power plant current collection line reclosing method based on wireless differential protection, belongs to the field of power system new energy power generation engineering, and is mainly applied to a control protection device of a wind power plant current collection line. Multi-end wireless differential motion of the current collection line is realized based on a 5G network and an electronic transformer; when a fault occurs in the current collection line area, reclosing is started; when a fault occurs outside the current collection line area, locking and reclosing are carried out; and reclosing time is longer than low-voltage ride-through time, and reliable arc extinguishing of instantaneous fault points of the line is guaranteed. The wireless differential protection can judge whether a fault point is on a current collection circuit or not, if the fault point is on the circuit, reclosing is started, if the fault point is on the box transformer side, reclosing is locked, and the wind power plant continuous power supply capacity and power generation reliability of the wind power plant can be remarkably improved.

Description

technical field [0001] The invention relates to a reclosing method for a wind farm collector line based on wireless differential protection, which belongs to the field of new energy power generation engineering in a power system and is mainly used in a control and protection device for a wind farm collector line. Background technique [0002] Reclosing is a safety automatic device of the line. When a transient fault occurs in the line, the line switch is disconnected, and the line switch is automatically closed after the arc at the fault point is extinguished and the insulation is restored. Since more than 90% of line faults are instantaneous faults, reclosing is widely used in transmission and distribution networks. The power collection line of the wind farm is a 35kV or 10kV transmission line T connected to about 10 wind box substations, with a length of about 10km, because the power collection line and the wind box substation are integrally connected. When the collector ...

AI Technical Summary

Problems solved by technology

When the collector line fails, it is impossible to distinguish whether it is a line fault or a box-transformer fault. If the fault point is on the box-transformer side, the reclosing action will have an impact on the faulty box-transformer, resulting in equipment damage or accident expansion. Therefore, the wind farm collector line Reclosing is not allowed

At present, after the power collection line of the wind farm fails, it needs manual line inspection and insulation test before the power collection line can resume power transmission, which greatly increases the time for the power collection line to resume power transmission and affects the power generation of the wind farm.

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