Electric power transmission can be categorized into AC (alternating current) and DC (direct current) systems, depending on the type of current used. In the 1880s, the first practical implementation of DC transmission was achieved. However, due to technological limitations at the time, it was difficult to increase the voltage of DC systems, which restricted their transmission capacity and efficiency. As a result, by the end of the 19th century, AC transmission began to take over, gradually replacing DC in most applications. The success of AC transmission marked the beginning of a new era in electrification during the 20th century. Today, three-phase AC systems operating at 50 Hz or 60 Hz are widely used across the globe. Since the 1960s, there has been a resurgence in DC transmission technology, especially with the development of high-voltage direct current (HVDC) systems. These modern DC systems are often integrated with traditional AC networks, forming what is known as an AC-DC hybrid power system. This combination allows for more efficient long-distance power transmission and better control over energy flow, making it a key component in today's smart grid technologies.
Tianjin Alcoa International Trade Co., Ltd. , https://www.tjalcoa.com