Multi-energy complementary grid-connected system applied to electrified railways and control method

Abstract

The invention discloses a multi-energy complementary grid-connected system applied to electrified railways and a control method. The multi-energy complementary grid-connected system is bridged betweena power supply arm of a traction transformer [alpha] and a power supply arm of a traction transformer [beta], and mainly comprises a wind power generation portion, a photovoltaic power generation portion, an energy storage portion, a comprehensive energy control portion, a DC support capacitor, a single-phase transformer and a single-phase back-to-back converter. Coordinated control for four power generation configurations of the multi-energy complementary system is accomplished based on traction load, wind and optical power prediction data; smooth scheduling is performed on unstable electricenergy through real-time data detection and processing so as to ensure the power supply reliability; and power supply mode selection is performed according to real-time traction operating conditionsso as to realize reasonable consumption of renewable energy sources. Meanwhile, active power transfer is realized through controlling the single-phase back-to-back converter, and corresponding reactive power and low-order harmonic current are outputted dynamically, thereby playing a role of reducing or eliminating negative-sequence current at a primary side of the traction transformer and complementing the reactive power and harmonic waves.

Description

technical field [0001] The invention belongs to the technical field of electrified railways, and in particular relates to a multi-energy complementary grid-connected system and a control method applied to electrified railways. Background technique [0002] As a large industrial user of the power system, the railway system has an annual power consumption of 40 billion kWh, of which more than 50% is mainly consumed in the traction power supply system. In order to realize the energy saving and consumption reduction of electrified railways, the railway system itself is also actively promoting the development of new energy and renewable energy, clearly proposing and encouraging the promotion and application of new energy and renewable energy power generation along the railway line according to local conditions and multi-energy complementary principles . In recent years, with the country's high attention and vigorous promotion, new energy sources such as photovoltaics and wind po...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a multi-energy complementary grid-connected system and control method applied to electrified railways, which can connect the multi-energy complementary power generation system to the traction power supply system of electrified railways, and meet the requirements of reasonable consumption of renewable energy, Improve or at least not worsen the power quality of the traction power supply system while saving energy and reducing emissions in the railway system

Images