Some reasons for direct current to replace alternating current

About DC Motors:

Some reasons for direct current to replace alternating current

Direct Current (DC) electric power is an emerging disruptive technological area that has the potential to stimulate economic growth, inspire innovation, increase research and development opportunities, create jobs, and simultaneously advance environmental sustainability.

In many applications, DC power sources are beginning to move toward replacing AC power sources as the global standard for power delivery infrastructure for some of the following reasons:

DC power is significantly more energy efficient than AC power.

DC motors and appliances have higher efficiency and power to size characteristics.

DC-based lighting (LED) is as much as 75% more efficient than incandescent lighting.

The greater efficiency resulting from recent developments in DC converter technology allows improvements in electricity delivery over long distances.

DC is inherently compatible with renewable sources of energy such as solar and wind. These renewable sources generate power intermittently (when the sun shines or the wind blows), requiring storage (batteries) in some applications as part of the system in order to provide reliable supply, and also require a power conversion interface to the grid. Solar PV is inherently a DC energy supply, as are batteries, making DC a more naturally compatible interface.

Energy storage integration is enhanced. Energy storage is required to improve the capacity utilization of renewable energy supplies. Most energy storage technologies are DC-based (primarily in the form of battery technologies), creating opportunities for improved integration efficiencies and reduced operating losses.

Electronic equipment operates on DC power. There is a loss of 5% to 20% when AC power is converted to DC power. The increasing reliance on electronic equipment creates a greater need for DC power. Eliminating these conversion losses from AC to DC will become even more important, and will motivate a shift to DC power, and require advances in new power conversion technologies.

DC and Hybrid AC/DC micro-grids are being developed. Micro-grid applications can effectively integrate local power generation with the main power grid to effectively serve defined end-use loads; improve reliability, especially under disturbance event conditions; and create opportunities to buy and sell (net metering) power to minimize energy costs to the consumer.

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