The Three Gorges Dam is not 170 meters high, only about 130 meters, and 175 meters is the altitude. The water height (the difference in water level between the dam and the dam) is approximately 100 meters (during the rainy season). There is no point in calculating the optimal rotation speed of the generator, because as long as it is a generator for the power grid, the rotation speed is fixed, and one revolution will not change. No more, not even one turn less (except for wind power, which is a DC permanent magnet generator). The Three Gorges Generator is the largest hydrogenerator in the world, with a power of 700,000 kilowatts and a rotation speed of 75 rpm (because the generator has 40 pairs of magnetic poles, or 80 poles. The nominal production voltage electricity is 20). kV, the rated current is 22,453 amps, 75. The rotation speed cannot be changed in any way, otherwise you will not be able torez not access the Internet.
The largest thermal power station in Sichuan is fully powered. What challenges will persistent extremely high temperatures bring to electrical safety?
Wind power and photovoltaics are new energy sources that China is working to develop. The electricity network must fully absorb them and prioritize their use. Hydroelectricity also requires priority use of the electricity network during periods of flooding. This is a comprehensive consideration of a series of factors such as environmental protection and the reduction of carbon emissions by the State. The electricity network can therefore do nothing! Why is it called “junk electricity”? There are mainly two aspects.
First, photovoltaic and wind energy have low installed capacity and are dispersed, making it difficult to meet needspeak load regulation of the electricity network! To put it simply, when the weather is sunny and the wind is blowing, the insufficient thermal power will be supplemented. When short-term electricity demand increases rapidly, photovoltaic and wind power cannot meet it. On cloudy days and when there is no wind, the power plant is dead. In the event of a power outage, thermal energy is used! And the price of new electricity on the network is relatively high! This means that when the sun rises, the heat load is reduced and when the sun sets, the heat load increases. For the power grid, constant adjustments are required, which is not conducive to the safety and economical operation of the power grid. Secondly, wind and photovoltaic power are not stable enough, resulting in the transmission of harmonics to the power grid system, whichwhich will increase power losses and affect motor efficiency, which will affect high precision manufacturing! These two reasons should be the reason why photovoltaic and wind energy are called "garbage energy".
Both are new energy production, which are currently encouraged and vigorously developed by the state, and there are huge state subsidies. , the grid settlement price for thermal power is about 0.3 yuan per kilowatt hour, and the price of wind and photovoltaic power generation ranges from 0.3 to 0.8 yuan.
Both types of electricity generation had a fatal flaw at the time, namely their intermittency. Solar power produced electricity during the day and could not produce electricity at night. Wind power could produce electricity when it was windy. but could not produce electricity when it did notthere was no wind. These two types of power generation are actually not well received by the power grid, but due to state support for new energy and requirements for energy saving and emission reduction, the electricity network company must accept them unconditionally.
There are more and more of these two types of electricity production, which lead to instability in the electricity network. At present, we mainly rely on thermal energy peak shaving, pumped energy storage, wind energy heating and wind energy heating. building energy storage power plants to solve intermittent problems. At the same time, wind and solar energy forecasts are becoming increasingly accurate, which also reduces pressure on electricity grid regulation.
ManyThese places in Sichuan experienced electricity shortages due to high temperatures, so Sichuan's largest thermal power station began supplying electricity at full capacity. High temperatures pose many electrical safety challenges. First of all, people feel sick during the day in hot weather. It's very hot, but with many places under power rationing, turning on the air conditioning has become a luxury, not to mention it keeps people from sleep peacefully at night, and resorting to thermal energy production is not guaranteed to solve the problem. issue. Second, the proportion of thermal power generation in Sichuan Province is only about 15%.Recently, the Department of Energy decided to increase this proportion to 20%. After all, local businesses cannot produce without the support of electricity, and lCorporate production is closely linked to economic development. Furthermore, the use of electricity is closely linked to society as a whole. Only when the electricity supply is normal are people willing to go out to consume. Currently, Sichuan's hydropower generation is insufficient, and the security of electricity supply depends on how thermal power generation plays its role.
1. Unable to guarantee electricity consumption for urban residents
Recently In Sichuan, people are suffering the consequences of power cuts fluent. Since summer, it's very hot during the day, but they can't turn on the air conditioner at will. sleep due to power outages. What is more important is that although thermal power plants located at various locations provide electrical power cIncomplete, they may not be able to resolve all of these issues immediately.
2. Enterprise production is affected
In modern society, enterprise production must rely on power supply, to ensure the correct movement of the machine. Long-term electricity rationing and even power outages have led to a large number of factories and businesses shutting down production. On the one hand, this prevents companies from carrying out their production tasks and, on the other hand, it has a lasting impact on overall social and economic development. Recently, the Sichuan Provincial Electric Power Department has increased the proportion of thermal power generation to about 20%.
3. Electricity can only be guaranteed if its consumption is guaranteed
Put aside industrial production activitiesuction and residents Let's not talk about electricity consumption in daily life, but from the perspective of the development of the whole society. If you want economic development, you have to make sure people are willing to consume. However, hydroelectric power generation is insufficient these days, and relying solely on thermal power generation will not necessarily solve all problems. Therefore, thermal power generation is also in great difficulty. pressure in the near future.