Thyristor controlled transformer type controllable reactor direct-current component restraining device and method

Abstract

The invention discloses a thyristor controlled transformer type controllable reactor direct-current component restraining device and method. Single cycle current integral average value closed-loop control is performed on the positive currents flowing into a central point from the auxiliary edge of a thyristor controlled transformer type three-phase controllable reactor and the negative currents flowing out of the central point, positive offset and negative offset values are introduced on the basis of thyristor traditional triggering angle phase shifting control, the positive offset and negative offset values are dynamically adjusted through the closed-loop control, and accordingly the controllable reactor can effectively eliminate direct-current components. The device and method has the advantages that the magnetization features of corresponding iron cores is dynamically controlled by fast detecting the winding currents of the reactor, high flexibility and response speed are achieved, iron core direct-current magnetic bias is prevented effectively, and the operation reliability of the reactor is increased.

Description

technical field [0001] The invention relates to a thyristor-controlled transformer-type three-phase controllable reactor DC component suppression device and method, and belongs to the technical field of power electronic equipment. Background technique [0002] Reactive power is an important guarantee for the safe, reliable and economical operation of the power grid, especially for ultra-high voltage and ultra-high voltage long-distance transmission networks. High-voltage shunt reactors can minimize the capacity rise effect of no-load or light-load lines, thereby limiting the amplitude of power frequency overvoltage and operating overvoltage. When the power transmitted by the line is close to the natural power, the capacitive reactive power and inductive reactive power of the line itself are balanced, and the high-voltage shunt reactor increases the reactive power transmitted by the line, resulting in additional loss and line voltage drop, which reduces the transmission capac...

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Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, the present invention provides a thyristor-controlled transformer-type controllable reactor DC component suppression device and method, which solves the problem of DC components appearing in the reactor iron core caused by unbalanced power supply or circuit components, making the iron The core is magnetized in one direction, and the unbalanced magnetic circuit will reduce the utilization rate of the iron core

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