Principle of energy storage and power generation device for electrical equipment

Why do we need electricity storage?

Compared with heat and cold energy, electricity is more suitable for long-distance transmission. Therefore, in the grid side, electricity storage must be carried out to solve the large difference between peak and valley power and increase the share of renewable energy generation.

What are the advantages of electrical energy storage?

Electrical energy storage offers two other important advantages. First, it decouples electricity generation from the load or electricity user, thus making it easier to regulate supply and demand. Second, it allows distributed storage opportunities for local grids, or microgrids, which greatly improve grid security, and hence, energy security.

Can electrical energy storage solve the supply-demand balance problem?

As fossil fuel generation is progressively replaced with intermittent and less predictable renewable energy generation to decarbonize the power system, Electrical energy storage (EES) technologies are increasingly required to address the supply-demand balance challenge over a wide range of timescales.

What is thermodynamic energy storage?

Thermodynamic electricity storage adopts the thermal processes such as compression, expansion, heating and cooling to convert electrical energy into pressure energy, heat energy or cold energy for storage in the low period of power consumption, and then convert the stored energy into electrical energy at the peak of electricity consumption.

What is electrochemical energy storage?

Electrochemical energy storage is based on systems that can be used to view high energy density (batteries) or power density (electrochemical condensers). Current and near-future applications are increasingly required in which high energy and high power densities are required in the same material.

Why is a battery of technologies needed for large-scale electrical storage?

Hence, a battery of technologies is needed to fully address the widely varying needs for large-scale electrical storage. The focus of this article is to provide a comprehensive review of a broad portfolio of electrical energy storage technologies, materials and systems, and present recent advances and progress as well as challenges yet to overcome.