There is a lot of instability in light and wind, and the former is a sunset, and the latter is sometimes no, the two will have a lot of impact on the grid. At this time, the main energy storage will play wind power and photovoltaic power generation. Save, save excess electric energy, etc.
Wind and light, two different natural phenomena, but there is an essential similarities, and sometimes there is no time when the sunset and wind, and humans cannot control.
Liu Hanmin, the engineer of the national style storage demonstration base, in his opinion, the wind can't see it, but the change in light in one day is steold. In order to maximize the use of solar energy, in the demonstration base, we saw the photovoltaic plates that followed the sun, and the photovoltaic plate and the fixed photovoltaic plate increased by about 18%.
If the big grid is compared to a large river, wind power and photovoltaic are the two tributaries of the big river, a tributary wave is rushing, turning into the sea, and a tributary, there is no fluctuation, and the dramatic fluctuation of the river is caused to cause Downstream“bridge”and“Ship”The huge damage, but the characteristics of electricity determine the power generation side and the electricity side to maintain balance, how much is used, that is, to ensure the balance and stability of the large grid.
If two tributs come to mess, how can I guarantee that the water flow of the big river in the grid is stable, then, the role of the power grid dispatch center will not be small.
The National Grid Xinjiang Scheduling Center is the central brain of the entire Xinjiang grid. The curves and numbers on the screen are not impressed, but for the dispatcher, these are related to the electricity of each corner of Xinjiang and the wind power plant in Xinjiang. Stable operation of the photovoltaic power station.
Cai Pengcheng, Director of China's Regulatory Power Dispatching Center, in an interview Because electricity and power is always balanced, with the use of electricity, the wind power and photovoltaic fluctuations are also vigorous, and the load of the system is also changed at any time.
So asked us to schedule the system to predict the fluctuation of wind power and photovoltaic, while we must predict this fluctuation of the electricity of our system, after forecast, we use hydropower and thermal power to go to the same balance Volatility to achieve this safe and stable operation of the entire system.
In order to more accurately predict and use wind power and photoelectric, the monitoring system of the scheduling center is connected to all wind farms and photovoltaic power stations in Xinjiang. More than 10,000 wind turbines in more than 180 wind farms, in this system, we have received the key data of the running power generation of 10,000 windows and the key data of local wind speeds and so on. After accessing these data, we can now do real-time power prediction of wind power. In the next 15 minutes, we have until the next four hours of prediction, and the highest accuracy can be 98%.
Accurate predictions and scheduling of wind and light do not mean that wind and light can call, especially in Xinjiang, wind energy resources, but there is not so much electricity demand, and many times the wind power can only waste it.
In 2016, China's total abandonment is equivalent to electricity to reach more than 480 billion kilowatts. It is equivalent to throwing a big city for one year, and China Xinjiang Electric Power Company Science Research Institute is using a method to let The wind that originally discarded can also play a role.
Kang Zhi, the deputy manager of the Energy Saving Service Company of Xinjiang Electric Power Research Institute, and he said that this project is a hot and hot and hot and hot and hot-heat-free project that is shipped in 2016. The so-called hot and cold double storage is for everyone to give you cold, and he will heating in winter. In the winter night, especially the air volume is particularly large. We turn this electric energy to heat energy stored by the electric boiler. This large-scale The water storage tank, then he is hot in this way, he will hear thousands of households during the day.
This large water storage tank can reach around a thousand tons. The design of the heating area is 430,000 square meters. If the heating area of a household is calculated by one hundred flat, it is almost 4300 households. Heating problems can be completely solved.
The water storage tank will play more wind power in the form of thermal energy, but if the electric peak, wind power and photovoltaic do not work, it is not a serious power outage, and the State Grid Corporation is vigorously promoting clean energy. A bold idea, put the electricity store in the battery.
In 2010, the State Grid Corporation turned this bold idea to reality, built the world's largest energy storage power station in the national style storage demonstration base, integrated with 275,000-story lithium iron phosphate batteries and large functional capacity of different manufacturers. Capacity flow battery.
Liu Hanmin, deputy general manager of the National Net Northern Fengguang, combined with example, showing us the largest monomer lithium battery, 200 security, 0.6 degrees, equivalent to mobile phone battery 40 to 50, now The total station is more than 80,000 yuan.
Assuming that the size of the storage battery is large enough, it is completely solved the unstable of wind power and photovoltaic. However, the current cost of energy storage is extremely high, in which case wind power, photovoltaic and energy storage are required to cooperate with each other. This is an exploitation output when wind and light and real estate.
With the addition of energy storage, wind power is a good friend of the grid, and the energy storage is like a water storage, and the wind power and photovoltaic power generation will be stored, and the excess electric energy is stored. When the power generation is insufficient, then it is released. Through real-time charge and discharge, it makes up for the impact of wind power and photovoltaic power generation.
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