On July 7, the maximum power load of the Jiangsu power grid hit a new record high for the third time this year, reaching 152 million kilowatts.
Just the night before, under the unified command of the power control center of State Grid Jiangsu Electric Power Co., Ltd., 93 new energy storage power stations in Jiangsu Province concentrated on discharging to the power grid during the evening power peak, with a maximum discharge power of 7.14 million kilowatts, realizing the largest-scale centralized call for new energy storage in my country, and testing the friendly interaction of all links of the new power system during the peak power consumption period in summer, and comprehensively improving my country's clean energy utilization level.
What is new energy storage?
Energy storage means "charging" when there is sufficient power generation from new energy sources such as wind power and photovoltaics, and "discharging" to the power grid or customers during peak power consumption or extreme scenarios. New energy storage, known as "super charger", generally refers to electric energy storage technology other than pumped storage, and is one of the regulatory means to cope with the many challenges brought by the construction of new power systems.
In this centralized call for new energy storage, State Grid Jiangsu Electric Power, through a new generation of dispatching support system, issued discharge instructions to more than 7 million kilowatts of new energy storage at the same time during peak power consumption, which can meet the power demand of about 48 million households for one hour at the same time.
In addition, during the peak of photovoltaic and wind power generation, the dispatching department issued charging instructions to the new energy storage power station, which can add a "super charger" that can store 14.5 million kWh of electricity to Jiangsu, and play its positive role in power supply and new energy consumption.
Three new highs, 152 million kilowatts
At present, continuous high temperature weather has occurred in many parts of my country, and the power grid load has continued to rise under the high temperature. On July 7, the maximum power load of the Jiangsu power grid has set a new record for the third time this year, reaching 152 million kilowatts.
On the evening of the 6th, in order to support the evening peak power consumption of the power grid, State Grid Jiangsu Electric Power carried out the largest-scale centralized call-up of new energy storage in my country. A total of 64 grid-side energy storage and 29 power supply-side energy storage power stations participated in the centralized discharge, with a total participating capacity of 7.248 million kilowatts. The actual maximum call-up scale was 7.14 million kilowatts, following the centralized call-up of 4.55 million kilowatts of new energy storage last year, which once again broke the record of centralized call-up scale, an increase of 56.9% year-on-year.
"Time and space regulator" of electric energy
"From a spatial perspective, most of Jiangsu's energy storage projects are located in northern Jiangsu, but electricity consumption is concentrated in southern Jiangsu. The peak electricity consumption in southern Jiangsu is during the day, while the peak electricity consumption in northern Jiangsu is at night. Therefore, energy storage can play a role as a 'time and space regulator'."
Qiu Chenguang, director of the Dispatching and Operation Department of the State Grid Jiangsu Electric Power Control Center, introduced that Jiangsu currently has 7.616 million kilowatts of new energy storage installed capacity, ranking fourth in the country, covering electrochemical energy storage, salt cavern compressed air energy storage and other forms.
In order to ensure the safety of the large power grid and make good use of the new energy storage as a "super charger", the dispatching department needs to comprehensively predict the online power of thermal power, wind power, photovoltaic power, etc. in the province, as well as the power and direction of power from outside the region, to determine the charging and discharging amount of the next day, and automatically calculate the charging and discharging time, charging and discharging amount, climbing rate, etc. of each energy storage project.
In addition, there is a measurement mechanism on the day of charging and discharging, which can predict the power load of the main grid in the province within the next 4 hours, and optimize the charging and discharging plan for the day accordingly.
It is understood that since last year, power grids in many parts of my country have successively carried out centralized deployment of new energy storage. Inner Mongolia, Shandong, Xinjiang and other places have carried out centralized deployment of new energy storage with a scale of more than 5 million kilowatts. Qiu Chenguang said that promoting the scientific dispatch of various new energy storage can give full play to the function and benefits of energy storage as a flexible resource, thereby driving the progress of new energy storage technology industry, and thus guiding the scientific configuration and high-quality development of various energy storage.
