Sichuan Deyang Converter Station has transmitted 48.2 billion kWh of electricity to Northwest Power Grid in 10 years

(Reporter Zhong Fan) On December 28, the reporter learned from the State Grid Sichuan Electric Power Company that over the past 10 years, the State Grid Sichuan Power Deyang Converter Station has continuously and safely transmitted 48.2 billion kWh of electricity to the Northwest Power Grid, and has received a total of 68.5 billion kWh of electricity from the Northwest Power Grid, realizing the mutual supply of electricity resources from the Yangtze River and Yellow River basins in the north and south, and the mutual assistance of water and fire, reducing the consumption of power coal by about 19.3 million tons and reducing carbon dioxide emissions by about 48 million tons.

It is understood that Deyang Converter Station is the first terminal of the ±500 kV Debao DC transmission project and the first DC converter station in Sichuan Province. The converter station has been operating safely and stably for 10 years, which also marks the 10th anniversary of DC transmission in Sichuan. Over the past 10 years, Deyang Converter Station has won honors such as the Pioneer Party Branch of the Power Grid from 2012 to 2014. Since participating in the safe operation evaluation of the State Grid Corporation's DC transmission system in 2011, it has also won the honorary title of "Red Flag Converter Station" of the State Grid Corporation for 8 consecutive years.

As an important transmission line in the power grid and an energy lifeline pipeline to resist natural disasters, the Deyang-Baoji ±500 kV DC transmission project has realized the seasonal transmission of Sichuan hydropower since it was officially put into operation on December 28, 2009, effectively reducing the amount of hydropower abandoned in Sichuan during the flood season. At the same time, it can receive thermal power and wind power sent back to Sichuan from the northwest to solve the problem of power shortage in Sichuan during the dry season. Its economic and social value cannot be underestimated, and it is conducive to achieving optimal resource allocation in a larger range. From the perspective of coordinated development of regional economy and resistance to natural disasters in my country, the positive impact of this DC project on the power grid and social economy in the northwest and central China regions is extremely evident.

It is reported that there are currently four DC transmission channels in Sichuan, namely the Debao DC transmission line connected to the Northwest Power Grid and the three "West-to-East Power Transmission" UHV transmission lines of Fufeng Line, Jinsu Line and Binjin Line. With the construction and commissioning of the ±800 kV UHV transmission projects of Yazhong-Jiangxi, Baihetan-Jiangsu and Baihetan-Zhejiang, Sichuan's hydropower transmission capacity will be greatly improved, which is of great and far-reaching significance for serving the national energy development strategy, integrating green energy exchanges between the east and the west, and promoting economic development and improving people's livelihood in Liangshan area.

Related information:

What is a converter station? What does a converter station look like?

Substations are places where voltage is changed. In order to transmit electricity generated by power plants to distant places, the voltage must be increased to high voltage, and then the voltage is reduced according to the needs near the user. This work of raising and lowering voltage is completed by our substations. In the above-mentioned power transmission process, our DC transmission technology is used, because DC transmission has irreplaceable advantages over AC in terms of long-distance, high-power, and low-loss transmission.

The role of the converter transformer is reflected here: at the sending end of the transmission line, the AC power of the AC system is sent to the rectifier through the converter transformer in the converter station, which converts the high-voltage AC power into high-voltage DC power and then sends it to the DC transmission line. The DC power is sent to the inverter in the converter station at the receiving end through the transmission line, which converts the high-voltage DC power into high-voltage AC power, and then transmits the electric energy to the AC system through the converter equipment.

For example, the mobile phone charger we are using now is used as a "conversion station" plugged into a 220-volt AC power socket. The data cable is equivalent to a 5-volt "DC line". The output electricity is converted into 5-volt DC power through the charger to power the mobile phone.