A 6-pulse tct type controllable shunt reactor

Abstract

The invention provides a six-pulse TCT-type controllable paralleling reactor. Primary side windings of the reactor are linked in a star-shaped mode and are connected in an electrical power system in parallel; control windings of secondary side windings are linked in a star shape, the outgoing line side of each phase of winding is connected with an antiparallel thyristor valve set to form a circuit, continuously changing reactive power can be provided by controlling a triggering angle of a thyristor, and the thyristor valve set is connected with a by-pass circuit breaker in parallel and used for being closed when a fault occurs or a system operates stably so as to bear the load current; compensation windings of the secondary side windings are linked in a triangular shape and are connected with a filtering unit, the harmonic current flowing into the system is reduced, and the quality of electric energy is improved. Compared with the prior art, the six-pulse TCT-type controllable paralleling reactor can serve as a dynamic reactive power compensation device and arranged in a switching station in a super / extra-high voltage alternate current long line or a transformer station of a wind electricity concentrated output system and a direct current transmission system, and the function of reactive voltage control is played.

Description

technical field [0001] The invention relates to a controllable parallel reactor, in particular to a 6-pulse TCT type controllable parallel reactor. Background technique [0002] Controllable shunt reactor is one of the key technical means to solve the contradiction between reactive power voltage control and overvoltage limitation on shunt reactor in EHV / UHV transmission system. According to different technical routes, controllable shunt reactors can be divided into two categories: transformer type controllable shunt reactors and magnetic control type controllable shunt reactors. Transformer-type controllable shunt reactors are adjusted according to the thyristor valve on the low-voltage side, including step-by-step regulation controllable shunt reactors and thyristor-controlled transformer (Thyristor Controlled Transformer, TCT) type controllable shunt reactors. [0003] At present, both the grade-adjustable and magnetic-controlled controllable shunt reactors have been appl...

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Problems solved by technology

[0003] At present, both the grade-adjustable and magnetic-controlled controllable shunt reactors have been applied in EHV power grid engineering applications. The grade-adjustable controllable shunt reactor has a simple principle and fast response speed, but it is used in EHV / UHV transmission systems. Considering Due to factors such as cost, the grading capacity should not be set too much, so it is more suitable for EHV / UHV transmission systems with drastic changes in power flow but seasonal or daily load characteristics; magnetically controlled controllable shunt reactors can achieve continuous output capacity , smooth adjustment, but the response speed is relatively slow; TCT type controllable shunt reactor has the advantages of fast response speed of graded adjustment type and smooth adjustment of magnetic control capacity, and can be used as line shunt reactor to solve reactive power compensation and overvoltage It can also be used as a bus shunt reactor to control the reactive power voltage of the system. It has unique advantages in the application of EHV / UHV AC transmission systems with large-scale centralized access to wind power. In hydropower with severe tidal current changes but seasonal characteristics There are also application prospects for centralized external transmission of AC power transmission systems

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