Solar power limitation begins even on land-The Electric Newspaper

[전기신문 정형석 기자]Following Jeju, the output control of renewable energy such as solar and wind power began on land for the first time.

According to the industry, on March 16, 17, and 22, the Anjwa smart farm solar power plant located in Sinan-gun, Jeollanam-do, forcibly stopped power generation for about an hour per session. It is said that the time when the generator is stopped is around 2~3 pm with the largest amount of solar power generation.

In the past, when the load (power demand) was temporarily low, such as during holidays, there were several deductions, but it was the first time that the output of renewable energy generators on land was limited in normal times, and thus the output of renewable energy such as solar and wind power was limited in the future. Is expected to increase.

Jeju Island, which has 36% of renewable energy facility capacity and 16.2% of power generation, has limited the output of wind power generation 77 times over the past year to prevent power outages due to fluctuations in the output of renewable energy.

It is known that near Japan also controlled the solar power output (total control amount 4.1%) over 75 days in 2019 alone, as supply exceeded demand, mainly in the Kyushu region, where solar power has increased rapidly.

The reason why the solar power limitation began in earnest in Sinan, Jeollanam-do is due to the intermittent nature of renewable energy, but fundamentally, it is because the amount of renewable energy exceeding the allowable capacity was linked to the power system.

The capacity of the renewable energy facility connected to the KEPCO Anjwa substation in Sinan-gun and the 154kV Hwawon TL, a KEPCO common line, is 270MW. However, according to the reliability standards, the maximum capacity of power generation facilities that can be accommodated here is only 187MW.

If the weather is good and the amount of solar and wind power is increased, the generator is always stopped or the output is reduced.

Even if KEPCO wants to reinforce the line, it is difficult to construct additional substations against the residents, so it is expected that the output limit will be inevitable for the time being.

Anjwa Smart Farm suffered a loss of millions of won due to the sudden need to stop the operation of the generator. However, at the time of the first grid-connected contract with KEPCO, they agreed that they can perform deceleration operation, so they will have to take additional deductions until the reinforcement of the track is carried out.