The cost of power grid operation will increase dramatically

The reporter was informed that the installed capacity of renewable energy such as wind power and photovoltaic power generation will achieve a significant increase in its development target by 2020, and the installed capacity of wind power to 2020 will increase to 150 million kilowatts, which is 50 times higher than the previous expected 100 million kilowatts. %.

Jiang Liping, deputy director of the State Grid Energy Research Institute, said that as China's wind power, photovoltaic and other renewable energy installations climbed rapidly, supporting peaking power supply construction and grid construction must keep pace, which means that the integrated operating costs of the grid will be greatly increased. , And then the price of electricity may be further improved.

The large increase in wind power calls for peaking power supply data shows that as of the end of 2010, the installed capacity of grid-connected wind power in the operating area of ​​the State Grid Corporation was 28.26 million kilowatts, the construction capacity was 35.8 million kilowatts, and the hoisting capacity was 40.25 million kilowatts.

It is understood that China's wind power generation capacity is 48.1 billion kwh, accounting for 1.4% of the entire society's electricity consumption; China's wind power grid connection capacity accounts for 4.2% of the country's largest electricity load, among which, Mengdong, Jilin, and Oubei are three. The proportion of wind power installed in the top areas accounted for 82%, 28.6%, and 9.8% respectively. For the above-mentioned grid operation in the above areas, the unstable factors caused by the relatively high wind power installed capacity are increasing.

Analysts said that the rapid increase in wind power grid-connected power installations urgently requires the acceleration of the construction of peaking power sources, such as the construction of pumped-storage power stations and the construction of fuel-fired gas power stations. The output of these power stations is relatively flexible and can be adjusted to meet the requirements of the grid to ensure smooth load. .

However, experts said that the construction of pumped-storage power stations requires very strict requirements on the geographical conditions and terrain. Not every location has the conditions to build pumped-storage power stations; in addition, there is currently no special subsidy policy for electricity prices for pumped-storage power stations. Due to the peaking effect, pumped-storage power stations are "pure energy-consuming" power stations. This means that for the power grid, building a pumped-storage power station means losing money and the construction enthusiasm is not high.

However, the cost of building a fuel gas-fired power station to do peaking power is relatively high. Wind-solar energy storage power stations are not only costly, but also technically not mature enough, and the energy storage capacity is too small.

Electricity price level may increase by 1.1%

According to Jiang Liping, there are serious wind power plants in China that have large scale, small grid capacity, and weak grid construction. With the continuous growth of new energy power generation equipment such as wind power and photovoltaic power generation in China, the overall operating cost of power grids will increase significantly.

It is understood that Spain's installed capacity in 2010 reached 20.3%, and wind power generated 16% of the electricity. In the power supply structure, the ratio of flexible dispatching power such as fuel gas and pumped storage units is 34.3%, which is about 1.7 times that of wind power. Therefore, China also needs to build peak power for wind power development and cross-provincial power grids for rapid development. It is expected that the scale of 150 million kilowatts of wind power development in China will be realized by 2020, of which more than 60% will need to be absorbed in a wider range through inter-provincial power grids. .

According to forecast, in 2020, the total installed capacity of wind power will increase from 100 million kW to 150 million kW, and the power grid investment will need to increase by 4.8%. Pump power storage, gas-fired power generation and other power investments that increase system peaking and operational flexibility need to be Increase 8.5% and 11.4%. As a result, the operating cost of the entire power system will increase by 1.1%, which means that the price level may also increase by 1.1%.