A hierarchical optimization control method for a multifunctional energy storage system for electrified railways

Abstract

The invention discloses a layered optimization control method for an electrified railway multifunctional energy storage system. The layered optimization control mainly includes a global optimization layer, which is used for system energy management; and a regional decision layer, which is used for normal / abnormal operation among subsystems. Coordinated control and comprehensive compensation of power quality under conditions; the local execution layer ensures self-discipline control within each independent subsystem. The invention can effectively recover and utilize the regenerative braking energy of the train and simultaneously improve the multiple power quality problems of the traction power supply system, which is beneficial to improve the quality of the traction power supply and bring additional economic benefits; at the same time, the energy storage system is formed based on a modular parallel structure with The fault-tolerant distributed redundant system can ensure the continuous execution of the above-mentioned multiple functions even in the case of external disturbances or partial failures, and reduces the stringent requirements for internal power electronic devices and improves the adaptability of the system.

Description

technical field [0001] The invention belongs to the technical field of electrified railways, in particular to a layered optimization control method of a multifunctional energy storage system of electrified railways. Background technique [0002] With the vigorous development of electrified railways in my country, how to effectively recover a large amount of regenerative electric energy generated during the locomotive braking process is a major challenge to promote the low-carbon transformation of railway energy. According to statistics, the Beijing-Shanghai Railway can generate up to 120GWh of regenerative braking energy every year, and the braking energy of the Shenshuo Railway can reach 20% of the total energy consumption. If these energy is not recycled, in addition to causing a great waste of energy, it will further deteriorate the power quality of the traction power supply system, especially the negative sequence, reactive power, harmonics, and traction network voltage ...

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Problems solved by technology

[0004] In the prior art, although there is a scheme to combine railway power quality compensation devices with energy storage systems, most of the existing systems do not have local fault tolerance, and at the same time, in a large-capacity environment (the demand for a single machine can reach more than 10MW) the system internal The rated capacity / endurance level of electronic power devices is strict; the comprehensive compensation function of power quality in the existing schemes is not well combined with the energy storage system, and at the same time, intelligent algorithms are rarely combined to optimize and accelerate the solution process; in addition, There is no energy management and optimal control method directly applicable to multiple energy storage systems in the existing schemes, especially for systems with multi-function and fault tolerance

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