Negative sequence centralized compensation control system of traction substation group and control method thereof

Abstract

The invention provides a negative sequence centralized compensation control system of a traction substation group and a control method thereof, and relates to the technical field of alternating electrified railway power supply. The traction substation group comprises n traction substations, sectionalized busbars of a same transformer substation supply power to primary sides of the traction substations, one traction substation in the traction substation group is set to a negative sequence compensation substation, other n-1 traction substations are set to single-phase substations, voltage phasesof each traction busbar and traction feeder in the traction substation group are same, and a traction network performs through-type same-phase power supply; the negative sequence compensation substation performs negative sequence centralized compensation, an input end of a controller of a same-phase compensation device is connected with a current transformer and voltage transformer of the negative sequence compensation substation and connected with a current transformer and voltage transformer of each single-phase substation through an optical network, an output end of the controller of the same-phase compensation device is connected with a control end of the same-phase compensation device, synchronous data transmission and real-time control are carried out, so that overall negative sequence reaches the standard. The negative sequence centralized compensation control system of the traction substation group and the control method thereof are mainly used for an electrified railway through power supply system.

Description

technical field [0001] The invention relates to the technical field of AC electrified railway power supply, in particular to the negative-sequence centralized compensation technology of traction substation groups. Background technique [0002] Electrified railways generally adopt the single-phase power frequency AC system powered by the public power system. In order to make the single-phase traction load be distributed as balanced as possible in the three-phase power system, the electrified railway often adopts the scheme of rotating phase sequence and separate phase and partition power supply. The adjacent power supply areas at the phase-splitting partitions are separated by phase-splitting insulators to form electrical phase-splitting, referred to as phase-splitting. The electric phase separation link is the weakest link in the entire traction power supply system, and the excessive phase separation of trains has become the bottleneck of traction power supply for high-speed...

AI Technical Summary

Problems solved by technology

Among them, the technology of single-phase traction transformer or combined in-phase power supply technology used in traction substations to cancel the electric phase separation at the outlet has been successfully applied, and the effect is very good. Its application is restricted by the conditions of the power grid. For example, if the power line of the power grid is connected in parallel with the traction network and the voltage level is relatively close, there will be a problem that the through power (balanced current) in the traction network is relatively large. In addition, the lack of relevant standards will affect bilateral power supply ( However, there is a power supply structure that does not generate through power, which is the radial structure power supply mode, that is, the segmented bus bars of the same substation of the power grid supply power to multiple traction substations respectively. In other words, in the network graph theory Form a tree-shaped power supply: the substation is the root of the tree, and each traction substation is the leaf

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