TCR soft start and SVC dynamic reactive power compensation device and soft start and dynamic reactive power compensation method

Abstract

The invention relates to a TCR soft start and SVC dynamic reactive power compensation device and a soft start and dynamic reactive power compensation method. The device comprises a TCR branch circuit, an FC branch circuit, a start switching loop, an operation switching loop and a control system; the TCR branch circuit comprises a first phase control electric reactor unit, a thyristor valve group unit, a second phase control electric reactor unit, a first switch and a second switch; the TCR branch circuit, the start switching loop and a motor are connected in sequence and connected with a power gird system bus, and a parallel bypass of the operation switching loop is connected between the power grid system bus and the start switching loop; and the thyristor valve group unit is a soft start device of the motor during motor starting, and the TCR branch circuit and the FC branch circuit are used as dynamic reactive compensation devices during operating or stopping of the motor. The TCR soft start and SVC dynamic reactive power compensation device and the soft start and dynamic reactive power compensation method are suitable for both the soft start of a high voltage motor and the reactive power compensation adjusting on the power grid, have multiple functions, and meanwhile have the advantages of simple structure, convenience for operation and maintaining, good performance, stability and reliability, and the equipment investment is reduced.

Description

technical field [0001] The invention relates to a TCR (thyristor phase-controlled reactor type SVC) soft start and SVC (static var compensator) dynamic reactive power compensation device and a soft start and dynamic reactive power compensation method, which belong to the high-voltage motor soft start and power grid reactive power compensation. In the field of power compensation technology, it is especially suitable for soft start of high-voltage motors in electric power, metallurgy, mines, and oil fields and reactive power compensation for power grids. Background technique [0002] AC motors are used in a wide variety of applications. In most occasions, the motor does not need speed regulation, but the high-voltage and large-capacity motor has a great impact on the power grid, causing voltage fluctuations, other equipment undervoltage, and poor operation affect production; the impact on the motor is large, causing aging or even damage to components, shortening the motor. Se...

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Problems solved by technology

Series reactors start in grades, with poor start-up performance, large rotation loss, secondary impact, and high noise; liquid resistors occupy a large area, require a lot of maintenance, have high energy consumption, have fixed start-up performance, cannot be adjusted, and start-up characteristics are similar to The ambient temperature is closely related and is very sensitive to the ambient temperature; the control performance of the ordinary saturated reactor is better than that of the series reactor, and its reactor has a wide adjustment range, which can overcome the problems of starting the series reactor, and has high reliability and performance, but the starting noise is large , up to 80-90dB, or even higher, and it is necessary to provide a large-capacity start-up auxiliary power supply

Since the excitation circuit is separated from the main circuit, there is a certain potential safety hazard in the short-term starting occasion; the series thyristor realizes the adjustment of the motor terminal voltage to achieve the purpose of soft start, which is an ideal starting method in theory, but in high voltage Occasionally, due to the need for high-voltage silicon controlled rectifiers, the reliability is not easy to be guaranteed, the maintenance is large, and the price is high.

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