System and method for reducing overvoltage of load shedding power frequency in adjacent circuits by controllable high-voltage parallel reactor

Abstract

The invention relates to a system and method for reducing overvoltage of load shedding power frequency in adjacent circuits by a controllable high-voltage parallel reactor. The system comprises two sections of circuits with the same voltage class, three transformer substations and two equivalent power supplies. The method comprises the following steps: outputting 70% rated capacity by the controllable high-voltage parallel reactor in a double-circuit line between one transformer substation and the other transformer substation under the heavy load situation; judging whether the double-circuit line occurs overvoltage of the load shedding power frequency between the other transformer substation and the third transformer substation or not; outputting 100% rated capacity by the controllable high-voltage parallel reactor after overvoltage signals of the load shedding power frequency are received; and recovering the rated capacity of the controllable high-voltage parallel reactor to 70% after the overvoltage of the load shedding power frequency in the double-circuit line between the other transformer substation and the third transformer substation is disappeared. After load shedding occurs in adjacent circuits, the controllable high-voltage parallel reactor arranged on the circuit is used immediately, and the controllable high-voltage parallel reactor is adjusted to the maximum capacity so as to reduce the load shedding power frequency overvoltage in the adjacent circuits.

Description

technical field [0001] The invention relates to the field of ultra-high-voltage power transmission systems, in particular to a system and method for reducing load shedding power frequency overvoltage of adjacent lines by using controllable high resistance. Background technique [0002] Controllable reactors are gradually applied in ultra-high voltage lines because they can automatically adjust their own capacity with changes in transmission power of the line, and can reduce the level of overvoltage on the line, improving the safety, reliability and economic benefits of the power grid. Install a controllable reactor on the long-distance outgoing heavy-duty channel, and adjust the capacity according to the arrangement of the system operation mode. [0003] Due to the long-distance power transmission requirements such as west-to-east power transmission and north-south mutual power supply in my country, most UHV lines are relatively long, and the charging power of a single-secti...

AI Technical Summary

Problems solved by technology

[0010] In the ultra-high voltage transmission system, if the adjacent lines of the lines with controllable high-resistance lines use conventional high-voltage shunt reactors, when the line is heavily loaded, the power frequency overvoltage will be higher when the line load shedding occurs, and even exceed the regulations. provisions that endanger the insulation of the equipment

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