Dynamic power distribution control method of urban rail hybrid energy storage system

A hybrid energy storage system and dynamic distribution technology, applied in electric braking systems, motor vehicles, electric vehicles, etc., can solve problems such as difficulty in meeting high power and high energy.

Pending Publication Date: 2020-05-29
HUNAN UNIV OF TECH
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Problems solved by technology

However, during the braking process of urban rail trains, up to 3MW/15kW·h of energy can be fed back. It is difficult for a single-device energy storage system to meet the dual demands of

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  • Dynamic power distribution control method of urban rail hybrid energy storage system
  • Dynamic power distribution control method of urban rail hybrid energy storage system
  • Dynamic power distribution control method of urban rail hybrid energy storage system

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specific Embodiment approach

[0056] The power dynamic distribution control method of the urban rail hybrid energy storage system proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and specific implementation methods:

[0057] Phase 1: Design a dual closed-loop control strategy for hybrid energy storage system based on traction power feed-forward, as shown in the attached figure 1 shown. Then, by designing the filter time constant τ output by the fuzzy inference system, the low-pass filter can drive the urban rail train with the required power factor P need Decomposed into low frequency load P bat and high frequency load P sc . Low-frequency loads are mainly provided by battery packs and power grids, and high-frequency loads are provided by supercapacitors. Low frequency load P bat and high frequency load P sc The optimal energy management of the hybrid energy storage system is achieved by controlling the bidirectional DC / DC converter thr...

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Abstract

The invention aims to solve a problem of traction network voltage safety caused by instantaneous high power, short-time high energy and the like of urban rail transit traction braking energy. In combination with a characteristic that a super capacitor and a battery have very strong complementarity in performance, a hybrid energy storage system of a double-DC/DC converter framework formed by supercapacitor-battery parallel connection is used for recycling traction braking energy. A double-closed-loop control strategy based on train traction power feedforward is provided on the basis of traditional double-closed-loop PI control, a fuzzy inference system and a low-pass filtering method are combined to cooperatively control power distribution of an energy storage element, and optimal energy management of the hybrid energy storage system is achieved by controlling a power distribution proportion. In the invention, a voltage fluctuation of a traction network can be effectively inhibited, anenergy utilization rate is improved, power of the energy storage system is optimized by monitoring a state of charge SOC of the energy storage device in real time, phenomena of overcharge and overdischarge of the energy storage element are prevented, and overall performance and cost performance of the hybrid energy storage system are improved.

Description

technical field [0001] The invention relates to the technical field of urban rail transit energy storage and energy saving, in particular to a power dynamic distribution control method for an urban rail hybrid energy storage system. Background technique [0002] Urban rail transit has been vigorously promoted in many cities due to its advantages such as large carrying capacity, punctuality and speed, and less environmental pollution. Urban rail transit lines consume a lot of energy and have high operating voltage requirements. Using energy storage in the DC traction network to recover excess braking energy is an effective means to achieve energy conservation in urban rail transit and ensure the voltage safety of the traction network. When the train brakes, the traction motor acts as a generator to deliver energy to the traction network, and the energy storage system absorbs the braking energy; when the train starts to accelerate, the energy storage system releases energy to ...

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Application Information

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IPC IPC(8): H02J1/10H02J1/14H02J7/34B60L9/00B60L7/10
CPCH02J1/10H02J1/14H02J7/345B60L9/00B60L7/10B60L2200/26B60L2260/162Y02T10/72
Inventor 王欣罗颖冰秦斌
Owner HUNAN UNIV OF TECH
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