How to use the energy storage power supply for a trolley case

Can a trolley assist system improve the receptivity of a DC power system?

On the downhill haul, the energy is wasted in the grid resistors. However, the trolley assist system could be designed in such a way that it improves the overall line receptivity of the DC power system by transferring the braking energy to the AC side, regenerating it, via the transformer, to the AC medium voltage distribution network.

How does a trolley line work?

The trucks run on diesel power in the pit, around the crusher and on level segments. The trolley line provides power on the grade resulting in increased truck speed, extending intervals between engine overhauls and reducing energy costs.

Why do mines use a trolley system?

Trolley systems are advantageous for mines where there is a big difference between diesel and electricity costs. For example, a power plant may have its own mine, or a mine may have its own power plant. In such cases, the mines want to run the trucks on trolley as power is much cheaper for them.

Which truck trolley system is most cost-effective?

The truck trolley system is most cost-effective on the ramps, where the most energy is required. The remaining haul cycle uses conventional diesel power. However, as will be shown later, it is extremely beneficial to put trolley lines on both uphill and downhill hauls to recover the braking energy.

What is the best battery for on-board energy storage?

For on-board energy storage, Deckard states that Siemens has thus far focused on Lithium Titanate Oxide (LTO) batteries and lithium supercapacitors due to their high inherent safety, 6C or greater charge/discharge power and long cycle life – capable of powering an all-electric truck throughout its design life without replacement.

How does trolley assist work?

The overhead lines are connected directly to the DC link. At the engine’s top speed, the fuel rate is 450 liters/hr (See Figure 2), but with trolley assist, the engine idles and the fuel rate drops to 40 liters/hr. This reduction leads to considerable fuel savings and is a significant step toward mines becoming more energy efficient.