Energy management system and method for a fuel cell hybrid locomotive

Abstract

The invention discloses an energy management system for a fuel cell hybrid electric locomotive, which comprises a unidirectional DC / DC converter based on a DC / DC conversion module and cascaded with a fuel cell power generation system, a DC / DC conversion module based on a DC / DC conversion module and connected with a battery pack level A bidirectional DC / DC converter connected to the system, a bidirectional DC / DC converter based on a DC / DC conversion module and cascaded with a super capacitor bank, a braking resistor unit, an energy management unit, a voltage acquisition circuit, a current acquisition circuit and a load interface. The invention realizes the braking energy recovery according to the demand of the traction motor, the output characteristics of the fuel cell, and the electrical characteristics of the battery pack and the super capacitor pack. The present invention is a fuel cell hybrid locomotive energy management system based on a DC / DC conversion module. The present invention makes the fuel cell work in a "high hydrogen efficiency mode", maintains the state of charge of the battery within a certain range, and can prolong the service life of the battery .

Description

technical field [0001] The invention belongs to the technical field of hybrid locomotive energy management, and in particular relates to a fuel cell hybrid locomotive energy management system and method. Background technique [0002] The lack of energy in the world is becoming more and more serious. As an effective solution, new energy has gradually become a research hotspot in various countries in the world. The development of renewable energy such as wind energy, solar energy, and hydrogen energy has become an inevitable trend in global energy development. Among them, fuel cells powered by hydrogen energy have outstanding advantages such as high efficiency, safety, environmental protection, and high power density, and have been widely studied by various countries. However, The fuel cell has low instantaneous response capability and slow dynamic response, so the hybrid power system combining fuel cell and auxiliary energy has received extensive attention from various countr...

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Problems solved by technology

[0004] At present, research on the energy management methods of fuel cell hybrid locomotives has been carried out at home and abroad, and many energy management implementation methods have also been proposed. Some scholars have proposed a fuzzy control energy management strategy based on particle swarm optimization. The hybrid locomotive composed of the hybrid locomotive can meet the dynamic performance of the locomotive through the fuzzy control energy management strategy based on the particle swarm algorithm, and also reduce the fuel consumption. However, when the locomotive generates braking energy, the charging power of the battery is required. And The charging and discharging of the battery is relatively large, resulting in a shortened service life of the battery

Some scholars have proposed an energy management method in the process of researching fuel cell hybrid power systems, so that the fuel cell can be switched to three modes: maximum output power, rated power, and maximum efficiency, which can meet the load demand and also realize the charging and discharging of the battery. However, this control strategy requires a large capacity of the battery, which increases the cost of the battery, and the charging process of the battery cannot directly control the charging current of the battery, and the control is relatively complicated

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