A device and method for comprehensive control of power quality with power integration function

Abstract

The invention discloses an electric energy quality comprehensive treatment device with the power facility function and a method. The device comprises two power supply converting branch circuits which are used for converting a single-phase power supply into a three-phase power supply. Each power supply converting branch circuit is formed by cascading a connection reactor, a soft charging circuit and an AC-DC-AC conversion assembly. The AC-DC-AC conversion assembly comprises three energy conversion modules which are in cascading, and each energy conversion module is formed by cascading a plurality of power conversion sub-modules with direct-current links and direct-current voltage conversion links. The soft charging circuits are used for conducting soft charging on the direct current links and then conducting energy conversion, and switching on and switching off of all the power conversion sub-modules are controlled to regulate the power output and conduct harmonic compensation. The method is an implementation method based on the electric energy quality comprehensive treatment device. The electric energy quality comprehensive treatment device with the power facility function and the method have the advantages that installation is convenient, occupied area is small, energy consumption is low, the power facility function is achieved, single-phase power supply can be converted into three-phase power supply, and meanwhile a power supply system can be comprehensively treated.

Description

technical field [0001] The invention relates to the technical field of traction power supply, in particular to a power quality comprehensive control device and method with power integration function. Background technique [0002] Due to the particularity of its single-phase load, the traction power supply system is different from general industrial users, and the problem of power quality is also particularly prominent, and the quality of power power is directly related to the stability of the power system and the safety of driving. Especially in recent years, a large number of high-power high-speed AC locomotives have gradually become the mainstream, and heavy loads and high speeds have become important features of modern railway transportation. However, the subsequent power quality problems are more complex and severe, mainly manifested in low power factor, large voltage fluctuation, complex harmonic content, and serious negative sequence impact. At the same time, the trac...

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Problems solved by technology

[0005] Chinese patent application CN101521386A discloses a direct-mounted high-voltage comprehensive compensation device for traction power supply, including 2 K-level cascaded bridge arms, 2K energy storage capacitors, and K isolated bidirectional DC converters, which are directly connected through AC reactors The traction network realizes the comprehensive compensation of power quality. However, this solution can only be applied to the power quality control in the three-phase power supply system, and is not suitable for the traction system in the single-phase power supply mode.

This solution can only realize the management of power quality in the three-phase power supply system, and is not suitable for the traction system of the single-phase power supply mode, and uses a step-down transformer, which occupies a large area and has high losses, which is not conducive to environmental protection

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