The transition of the transmission grid to DC will be an important trend

In recent years, China’s economy has developed rapidly. The resources of electric power grids have been strained. The development of renewable energy sources is imminent. The clean use of renewable energy, nuclear energy and fossil energy must be realized by converting them into electricity. Therefore, the future grid will Become an important energy delivery and distribution network for the entire society.

The future of smart grid development will face the following three challenges - new energy, long-distance, reliability. Here we explain one by one.

1. New energy will become the protagonist of future transportation

According to the “2013-2017 China Smart Grid Industry Market Preview and Investment Strategic Planning Analysis Report” published by the Industry Research Institute of Forward-looking Industry, the thermal power generation capacity in China in 2011 was 380 million kWh, accounting for 82% of the total, of which coal power generation The proportion is 80%. The National Twelfth Five-Year Plan for Renewable Energy Development mentioned that by 2020, the hydropower installed capacity is planned to reach 420 million kilowatts, 200 million kilowatts of wind power and 50 million kilowatts of solar energy. According to this calculation, by the end of the twelfth five-year period, the proportion of coal-fired power generation in China will drop to around 60%. From a long-term perspective, by 2050, the proportion of coal-fired power generation will be reduced to 40%. Thus, in the future, new energy will become the protagonist of grid transmission.

2. Long-distance transmission will become a major obstacle, but also a challenge

In 2010, China’s trans-provincial West Power Transmission reached 80 million kilowatts. According to plan, by 2020, the total installed capacity of power generation in China will reach 1.93 billion kilowatts, and the transmission of electricity from west to east will reach 3.5 to 430 million kilowatts, which is 4 to 5 times the current level. In response to the challenges posed by long-distance transmission, Tang Guangfu, a researcher at the State Grid Smart Grid Research Institute, believes that DC-grid technology will be an effective means to solve these problems. For example, northwest northwest thermal power and wind power can be sent to Sanhua regional power grid through local grids and direct current.

3. Improve the reliability of the power grid

The safety and stability issues of large AC power grids are becoming increasingly prominent. Resolving power grid security will become the primary task of China's power grid this year. Therefore, the transition of the power transmission grid to the DC direction will be an important trend.