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Combination switch type step controllable shunt reactor

A composite switch, series reactor technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., to suppress operating overvoltage, prolong service life, and avoid instantaneous capacity fall effect

Active Publication Date: 2011-05-25
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At home and abroad, there is no composite switch-type hierarchical controllable shunt reactor device proposed by the present invention to be put into ultra-high voltage / ultra-high voltage power grid applications

Method used

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  • Combination switch type step controllable shunt reactor
  • Combination switch type step controllable shunt reactor
  • Combination switch type step controllable shunt reactor

Examples

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Embodiment Construction

[0032] Composite switch-type graded controllable shunt reactors can be divided into different capacity levels according to system requirements, and each capacity level can be designed to be equal or unequal. number of series reactors. attached figure 1 And attached figure 2 Taking 4 equal capacity levels (25%, 50%, 75%, and 100% capacity levels) as an example, the three-phase principle wiring diagram and single-phase main wiring diagram are shown when the capacity is equally divided into 4 levels.

[0033] attached by figure 1As shown, the composite switch-type graded controllable shunt reactor body adopts a transformer structure, and the three-phase high-voltage side windings are connected in a "Y" shape, directly connected to the high-voltage power grid, and grounded through the reactor after the neutral point is short-circuited. The first ends of the three-phase low-voltage side windings are respectively led out through bushings, and the ends of the low-voltage side win...

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Abstract

The invention belongs to the field of electric system reactive power compensation, and provides a combination switch type step controllable shunt reactor. The controllable shunt reactor body adopts a transformer structure and can be designed into two forms based on requirements, i.e. the high short circuit impedance form or the form of an ordinary transformer with an external reactor. In the controllable shut reactor, combination switches are controlled to be matched with body short circuit impedance, thus the output of reactive capacity and the step regulation can be realized; each combination switch includes a circuit breaker, a thyristor valve, and a reactor, wherein the circuit breaker is connected in series with the reactor; when the controllable shunt reactor operates stably at a capacity step, the circuit breakers are closed to bear long-term working current, and the thyristor valves do not need work for a long time; and during step regulation of capacity, the to-be-taken energy and the turning-on voltage are provided for the thyristor valves based on the divided voltage provided by the reactor connected with the circuit breaker in series, so that current can be connected and disconnected in a zero-crossing switching manner by the thyristor valves without switching on / off the circuit breakers, so that the service life of the circuit breaker is prolonged.

Description

technical field [0001] The invention belongs to the field of reactive power compensation in electric power systems, and in particular relates to a compound switch-type hierarchical controllable shunt reactor device. Background technique [0002] According to the national renewable energy development plan, the northwest region will build a 10 million-kilowatt wind power base along the Hexi Corridor, which is far away from the load center. In the case of large-scale wind power grid-connected, the efficient and economical delivery of wind power and the safe and stable operation of the power grid have become constraints in the northwest. Two major technical problems in the development of wind power in the region. Wind power generation has the characteristics of intermittent, fluctuating and random. The output of wind farms varies greatly, and the fluctuation of wind power makes reactive power fluctuate frequently on the 750kV transmission channel in the northwest. The control o...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02H9/04H02H9/02
CPCY02E40/30
Inventor 张帆邓占锋徐桂芝雷晰张振环贾跟卯武守远尹正民王多姚锋
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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