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Electrified railway in-phase hybrid energy storage power supply system

An electrified railway, hybrid energy storage technology, applied in power lines, AC network load balancing, transportation and packaging, etc. problems, to achieve the effect of reducing payment, outstanding economic performance, and improving capacity utilization

Inactive Publication Date: 2021-07-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The Chinese patent with the publication number CN107104444A discloses a device and its control method for peak-shaving power supply and negative-sequence control of electrified railways. The charging and discharging of the energy storage device is controlled by the load power reference value to realize peak-shaving and negative-sequence control. , but because the system prioritizes a single power-type device, the supercapacitor, as an energy storage device, the peak-shaving capability is weak, and the problems of low utilization of traction transformer capacity and low utilization of regenerative braking energy are not solved.

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  • Electrified railway in-phase hybrid energy storage power supply system
  • Electrified railway in-phase hybrid energy storage power supply system
  • Electrified railway in-phase hybrid energy storage power supply system

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[0017] Such as figure 1 As shown, this example includes traction transformer 1, matching transformer 2, traction bus 3, MMC rectifier 4, MMC inverter 5, super capacitor 6, storage battery 7, current transformer 8, voltage transformer 9, measurement and control device 10, Hybrid energy storage device 11; traction transformer 1 is a single-phase transformer, which forms a Scott connection with matching transformer 2 and is connected to the primary three-phase power grid (ABC) side; hybrid energy storage device 11 includes power type equipment—supercapacitor 6 and energy type Equipment—battery 7; hybrid energy storage system includes MMC rectifier 4, MMC inverter 5 and hybrid energy storage device 11, connected between matching transformer 2 and traction bus 3, and power supply in the same phase as traction transformer 1; current transformer 8 It is connected with the voltage transformer 9 to the measurement and control device 10 to provide load information, and realize real-time...

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Abstract

The invention belongs to the technical field of electrified railway power supply, and particularly relates to an electrified railway in-phase hybrid energy storage power supply system. According to the scheme, the hybrid power supply system is mainly formed by an MMC rectifier, an MMC inverter, a super capacitor and a storage battery, and traction load peak clipping and valley filling are carried out through the super capacitor and the storage battery by controlling the MMC rectifier and the MMC inverter based on real-time power collected by a traction bus and a preset charging and discharging reference through a measurement and control device. Different power threshold control modes are adopted for the hybrid energy storage device, the energy characteristic of the storage battery and the power characteristic of the super capacitor are reasonably utilized, the hybrid energy storage device works cooperatively under different charging and discharging requirements, and the service life of the energy storage device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrified railway power supply, and in particular relates to an electrified railway in-phase hybrid energy storage power supply system. Background technique [0002] In recent years, the operating mileage of electrified railways in my country has grown rapidly, ranking first in the world. By the end of 2020, the national railway fixed asset investment has completed 781.9 billion yuan, the national railway operating mileage has reached 128,000 kilometers, and the double track rate has reached 61.6%. The national railway energy consumption conversion standard 15.4883 million tons of coal. Therefore, how to effectively reduce investment, operating costs, and energy consumption has become an urgent problem to be solved in the rapid development of electrified railways. [0003] The traction load of electrified railways has the characteristics of large fluctuations. During normal operation, the traction trans...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28H02J3/32B60M3/00
CPCB60M3/00H02J3/28H02J3/32
Inventor 张丽艳贾瑛郑兴罗博雷万良韩笃硕
Owner SOUTHWEST JIAOTONG UNIV
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