Novel system and method for managing electrification railway electric energy quality

Abstract

The invention discloses a novel system and method for managing electrification railway electric energy quality, wherein the system comprises a traction transformer with a filter winding, a sensing filter circuit, an MMC compensation system, an MMC controller, a voltage and electric current measuring apparatus; the traction transformer high voltage side is connected to electric network; a traction side is connected to a traction arm of an electric locomotive for providing electric power for the electric locomotive; and a low voltage compensation side is connected to the sensing filter circuit and the MMC compensation system. The MMC compensation system is constituted by two connected to single-phase MMC traction arm groups; direct current sides of the two MMC traction arm groups are connected together through a serial capacitor; and a grounding point of the MMC compensation system is led out in the geometric midpoint of the serial capacitor. With the method, harmonic waves are dynamically tracked and suppressed through the MMC technology and the sensing filter technology; active power balance and reactive power adjustment are performed to the load at two traction sides, thereby achieving the purposes of managing the harmonic waves, reactive power and negative sequence of the traction transformer high-voltage side of the electrification railway.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a novel electric power quality control system and method for electrified railways. Background technique [0002] With the large-scale construction of high-speed electrified railways in China, the impact of the high-speed railway power supply system on the power quality of the power grid is becoming more and more serious. Due to the unbalanced structure of V / V traction transformers with filter windings widely used in high-speed railway construction, large negative sequence currents will appear on the grid side, seriously affecting the safe and stable operation of the power system. Secondly, a large number of harmonics brought by the operation of electric locomotives will flow into the power grid through the traction transformer with filter windings, causing pollution to the power grid. In addition, although the power factor of AC-DC-AC electric locomotives used i...

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Problems solved by technology

[0004] In order to comprehensively solve various power quality problems in the electrified railway traction system and ensure that the power quality on the grid side meets the requirements of the national standard, this invention proposes an electrified railway power quality management system based on modular multi-level technology and induction filtering technology and method

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