The hybrid energy storage device of hargeisa urban rail

Are energy storage systems a problem in urban rail transit?

There are three major challenges to the broad implementation of energy storage systems (ESSs) in urban rail transit: maximizing the absorption of regenerative braking power, enabling online global optimal control, and ensuring algorithm portability.

What are the challenges faced by hybrid energy storage systems?

The most challenges for the hybrid energy storage system made up of the battery and super capacitor (SC) are the reasonable energy management strategy (EMS) and real-time implementation.

Which energy storage system is used for DC traction network voltage smoothing?

Hybrid energy storage system is used for DC traction network voltage smoothing. Coordination control and switching rules is designed for drive system and HESS. K-ILC is proposed to stabilize the DC voltage and optimize battery lifetime. Hardware-in-the-loop simulation shows the effectiveness of the strategy.

How regenerative braking energy is dissipated in urban rail transit?

In urban rail transit with a 750 V voltage level, even if the capacity configuration of the WESS is large enough, the regenerative braking energy cannot be fully absorbed, so the braking energy is dissipated on the braking resistor.

How to reduce traction energy consumption of urban rail transit?

Reducing the traction energy consumption of urban rail transit is critical for society to achieve energy conservation and emission reduction goals [3, 4]. Making full use of the regenerative braking energy of a train is the key to reducing the energy consumption of urban rail transit.

What is urban train energy transmission distance?

Reference introduced the concept of urban rail train energy transmission distance by analyzing the weak points in a traction power supply network and proposing a strategy to change the charging and discharging threshold according to the train position to reduce voltage fluctuations.