Tidal current control device for V/v traction substation of electrified railway

Abstract

The invention discloses a tidal current control device for a V/v traction substation of an electrified railway. The device consists of a static power adjuster, a TCR filter and an LC filter (FC), wherein the static power adjuster is mounted on the secondary side of the V/v traction substation, and a back-to-back structure is formed by the static power adjuster and a capacity on the public direct current side; the alternating current side of a current converter is connected to power supply arms on the secondary side of the traction substation respectively through a voltage drop transformer; an FC filter is connected to a phase a of the secondary side of the V/v traction substation, and the TCR filter is connected to a phase b of the secondary side of the V/v traction substation. All parameters are calculated by capacity optimization, so that the cost and the system harmonic absorption content can be reduced. A double-closed-loop controller is used for controlling the tidal current distribution of the two power supply arms, so that multi-mode tidal current control is realized; by matching of the V/v traction substation, the TCR filter, the FC filter and the static power adjuster, multi-mode tidal current double-closed-loop control on the traction substation of the electrified railway is realized; voltage fluctuation is suppressed, main harmonics are effectively shielded, and comprehensive negative sequence and reactive treatment is realized.

Description

technical field [0001] The invention relates to the field of electrified railways, in particular to a power flow control device for a V / V traction substation of an electrified railway. Background technique [0002] With the rapid development of electrified railways in my country, power quality problems such as voltage fluctuations, negative sequence, reactive power and harmonics caused by electrified railway load characteristics and traction transformer wiring types have become increasingly prominent, and these problems will affect many traction power supply systems. The normal operation of this kind of power equipment brings hidden dangers to the safe and stable operation of the traction power supply system. [0003] At present, the methods for controlling harmonics mainly include passive filtering and active filtering (APF); for controlling reactive power, SVC and static var generator (SVG) are mainly used. The railway power conditioner (RPC) can comprehensively control th...

AI Technical Summary

Problems solved by technology

The railway power conditioner (RPC) can comprehensively control the negative sequence, reactive power and harmonics of the electrified railway traction power supply system. However, since the RPC uses active devices, the capacity is large and the cost is high, so the capacity of the device is appropriately reduced to reduce the cost of the device. It is of great significance to the marketing promotion of RPC

Moreover, at present, RPC generally adopts open-loop full compensation control, and the comprehensive control effect on random fluctuating loads is not ideal. Closed-loop control is needed to improve the control effect.

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