Device and method for boosting network voltage at tail end of electrified railway power supply arm

Abstract

The invention discloses a device and a method for boosting network voltage at the tail end of an electrified railway power supply arm. A network voltage boosting device is assembled at the tail end of a power supply arm in a traction substation, and the reactive current of a load is dynamically compensated on site; therefore, the circuit network voltage is boosted. A fixed capacitor (FC) device, a dynamically adjustable reactive source and a voltage transformer are connected in parallel; the dynamically adjustable reactive source and the FC device are matched to dynamically track and compensate the reactive current of the load on site; the dynamically adjustable reactive source realizes stepless and non-contact switching and controls the reactive capacity of output; the FC device comprises a filter reactor and a capacitor bank which are connected in series; and a secondary side of the voltage transformer is connected with a controller. By the device and the method, the problems that atransmission line has lower efficiency and an optimized network voltage boosting effect cannot be achieved due to relatively high equipment mounting capacity of a compensation device arranged in the substation and the reactive current because of long power supply arm and high line impedance are solved, the network voltage boosting device is not limited by a space position of the traction substation, the investment is low, and the construction period is short.

Description

technical field [0001] The invention relates to a power quality control device, in particular to a device and method for increasing network voltage at the end of an electrified railway power supply arm, which is mainly used in rail transit power transmission and distribution systems. Background technique [0002] With the acceleration of the development of high-speed and heavy-duty railways in my country, the traffic volume of railway lines is increasing day by day. Due to the influence of terrain and terrain, the layout of traction substations in many electrified operation sections is far away, making traction with large slopes The grid voltage is too low (lower than 19kv), causing parking accidents and seriously affecting the transportation capacity of the line. [0003] At present, the solution to the low voltage of the traction network generally adopts methods such as expanding the capacity of the transformer, increasing the diameter of the distribution line, changing the...

AI Technical Summary

Problems solved by technology

Due to the large load fluctuation at the end of the power supply arm of the electrified railway, if only FC devices or MSC and TSC graded switching devices are used, the switching frequency is relatively high, and dynamic tracking compensation cannot be realized, which will easily cause reactive power over-compensation and under-compensation. lead to large voltage fluctuations

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