Power distribution method for ground-type hybrid energy storage system for rail transit
A technology of hybrid energy storage system and rail transit, which is applied in the field of power distribution of the ground-type hybrid energy storage system, which can solve the problems of large loss, low efficiency, and capacity decay of the hybrid energy storage system, so as to prolong battery life and improve efficiency and economy, the effect of reducing loss
Active Publication Date: 2021-09-24
安徽能汇轨道交通技术有限公司 +2
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Problems solved by technology
[0005] This control strategy is relatively simple, but it also has disadvantages
The power distribution of batteries and supercapacitors in this control method usually adopts a heuristic rule-based control method, which leads to large losses and low efficiency of the hybrid energy storage system
At the same time, the battery is charged and discharged many times, and the battery may be overcharged and overdischarged, which will lead to an increase in the internal resistance of the battery, a decrease in capacity, and a shortened service life.
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[0051] The present invention will be further illustrated below in conjunction with the accompanying drawings and specific examples. The examples are implemented on the premise of the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0052] Such as figure 2 as shown, figure 2 It is the urban rail transit power supply system diagram of the hybrid energy storage system of the present invention. In order to realize the effective control of two energy storage components, the present invention discloses a ground-type hybrid energy storage system for rail transit, including batteries, supercapacitors and Two DC-DC converters; the battery and the supercapacitor are respectively connected in parallel to the DC traction network through a DC-DC converter. The DC traction network is formed after the urban power grid is connected in...
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The invention discloses a power distribution method for a ground-type hybrid energy storage system used in rail transit. The hybrid energy storage system includes a battery, a supercapacitor and two DC-DC converters; the battery and the supercapacitor are respectively converted by a DC-DC The device is connected in parallel on the DC traction network; and the power distribution method calculates the loss of the battery, the supercapacitor and two DC-DC converters, and establishes an objective function, and obtains the power distribution ratio after the objective function is processed; the purpose of the present invention In order to reduce the loss of the hybrid energy storage system, prolong the service life of the battery, and improve the efficiency and economy of the energy storage device, a hybrid energy storage system based on predictive control and its power distribution control method are proposed, which considers the characterization of battery life Losses in models, converters and energy storage components.
Description
technical field [0001] The invention belongs to the technical field of urban rail transit regenerative braking energy utilization, and in particular relates to a power distribution method for a ground-type hybrid energy storage system used in rail transit. Background technique [0002] At present, many lines in domestic urban rail transit are equipped with ground-type super capacitors to store braking energy. Due to the low energy density of supercapacitors, it cannot provide enough emergency self-traction energy for power failure trains. The battery and supercapacitor hybrid energy storage system is mainly used in wind power, microgrid, electric vehicles and other fields. Urban rail transit is very different from the above application scenarios. For example, the existing operation diagram of the train is relatively fixed during operation, the train departure interval changes with time, and the no-load voltage fluctuation of the substation all affect the energy saving effec...
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IPC IPC(8): H02J1/10H02J1/14H02J7/34
CPCH02J1/14H02J7/345H02J1/106H02J2207/50
Inventor 杨中平林飞李彬赵亚杰孙湖杨浩丰刘文正
Owner 安徽能汇轨道交通技术有限公司