Braking resistor and energy storage braking

How does regenerative braking work?

In trains with regenerative braking capability, a fraction of the energy used to power a train is regenerated during braking. This regenerated energy, if not properly captured, is typically dumped in the form of heat to avoid overvoltage. Finding a way to recuperate regenerative braking energy can result in economic as well as technical merits.

Can a storage system recover braking energy of a train?

Braking energy of trains can be recovered in storage systems. High power lithium batteries and supercapacitors have been considered. Storage systems can be installed on-board or along the supply network. A simulation tool has been realised to achieve a cost/benefit analysis. 1. Introduction

What is regenerative braking energy recovery system?

Before connecting the regenerative braking energy recovery system, when a metro train is in traction operation, E tr is provided by the traction substation. When a metro train is in regenerative braking operation, part of the braking energy is returned to the DC bus, and part of it is consumed by the braking resistance of the train.

Why is regenerative braking better than a wayside storage device?

The energy stored by the regenerative braking during the deceleration of the train can be used for the next process of accelerating itself. Compared with the wayside storage device, since onboard energy storage device has no line losses, it has higher energy transmission efficiency.

How does a metro train braking resistor work?

The metro train is equipped with a braking resistor system. The braking resistor is activated when the DC busbar voltage rises to the limit, consuming the residual braking energy as a final measure to ensure the safety of the DC busbar voltage.

Does energy storage reduce regenerative braking energy use?

Actual reductions in energy use mainly depend on the number of start and stops as well as the traveled route . To analyze the effectiveness of energy storage for capturing a larger share of the regenerative braking energy, many parameters need to be considered.