Hierarchical optimization control method for multifunctional energy storage system of electrified railway

Abstract

The invention discloses a hierarchical optimization control method for a multifunctional energy storage system of an electrified railway. The hierarchical optimization control mainly comprises a global optimization layer which is used for system energy management, a regional decision-making layer used for coordination control and electric energy quality comprehensive compensation under normal/abnormal working conditions among the subsystems, and a local execution layer which ensures that self-discipline control is carried out in each independent subsystem. Train regenerative braking energy can be effectively recycled, multiple electric energy quality problems of a traction power supply system can be solved, the traction power supply quality can be improved, and extra economic benefits can be brought; and meanwhile, the energy storage system forms a distributed redundant system with fault-tolerant capability based on a modular parallel structure, continuous execution of the multiple functions can be ensured even under the condition of external disturbance or local faults, the strict requirements for internal power electronic devices are reduced, and the adaptability of the system is improved.

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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