Flywheels are added to power grid, cyclic wave accidents can be solved, regenerated electricity limiting errors are corrected, and method is new method for reducing carbon emission.

Abstract

1, China has 4 hundreds of millions of kilowatt hydropower and has 2 hundreds of millions of kilowatt frequency modulation capability within 10 seconds, wind power fluctuation: super typhoon, wind speed of 55 meters per second, diameter of 1100 kilometers, estimated 10 thousand kilowatt wind power per square kilometer, fluctuation of 605 thousand kilowatt within 10 seconds, far less than power grid frequency modulation capability, and meanwhile, within 10 seconds, automatic tripping of wind power can be realized, and no high frequency accident possibility exists; (2) a generator set rotor and a water turbine flywheel automatically release or absorb kinetic energy and perform compensation adjustment during cyclic wave fluctuation, compensation is surplus after entering the large power grid, and the cyclic wave accident is difficult to occur in 60 years, and (3) regenerative electricity installation accounts for 29.5% of the whole power grid, the cyclic wave accident is reproduced, the regenerative electricity is found to have no kinetic energy, and the regenerative electricity is found to have no kinetic energy. When surplus kinetic energy of the power grid is used up, a point flywheel is added to the power grid or no kinetic energy of regenerated electricity is overcome, and 3, in 202 1 year, generator installation / wind power installation gt; 6, the number of flywheels can be estimated to be increased or reduced; and 4, the regenerated electric quantity exceeds thermal power, and carbon emission is reduced.

Description

1. Technical Field

[0001] It belongs to the frequency and peak regulation technology of the power grid. 2. Background Technology

[0002] It is also background technology and is now discovered. 3. Description of the drawings

[0003] No pictures

[0004] IV. Explanation of the Findings

[0005] 1. Problems that can be solved: Correct the mistake of restricting renewable electricity. Wind power and photovoltaic power can be greatly increased to exceed thermal power generation, which is a new way to reduce carbon emissions.

[0006] 2. Technical description of the findings

[0007] It was found that adding flywheels to the power grid can solve frequency accidents and correct errors in limiting renewable electricity, which is a new way to reduce carbon emissions.

[0008] I am just an 80-year-old power plant engineer. I have seen frequency accidents caused by the start and stop of large motors in small power grids. Frequency accidents are rare in large power grids in 60 years, and they reappeared in 2022. What I immediately thought of is: electricity consumption has increased, peaks and valleys have also increased, and it was found that renewable electricity has no kinetic energy. The installed capacity has accounted for 29.5% of the entire power grid. The surplus kinetic energy has been used up, which naturally causes frequency accidents to reoccur. Adding a flywheel or overcoming the lack of kinetic energy of regenerative electricity can solve the problem.

[0009] 3. Important analysis data

[0010] In 2022, there will be restrictions on wind power. It is necessary to analyze the installed capacity of power generation equipment across the country:

[0011] Thermal power 52% (1.33 billion kilowatts), hydropower 16% (410 million kilowatts), nuclear power 2.5%, wind power 14.3% (limited wind power (365 million kilowatts)), photovoltaic power 15.2%. Renewable electricity totals 29.5%

[0012] The proportion of power generation equipment in the country in 2022:

[0013] Thermal power accounts for 66.5%, hydropower 15.3%, nuclear power 4.7%, wind power 8.6%, and photovoltaic power 4.8%.

[0014] 5. Give an example to illustrate the calculation method of kinetic energy:

[0015] 1. Definition of flywheel frequency modulation energy storage: When the frequency drops by 0.25, the flywheel kinetic energy decreases to 0.990025%, and when the frequency increases by 0.25, the flywheel kinetic energy increases to 1.010025%, which is uniformly calculated as 1% of the 50-frequency energy storage. Unit: degree.

[0016] 2. Assume: a 1 million kW steam turbine generator is used, the rotor and flywheel have the same mass, 100 tons, a rotation speed of 50 rpm, and a flywheel diameter of about 6 meters. The kinetic energy is calculated as follows:

[0017] Kinetic energy = 0.5*mv 2 m = 100 tons = = 10 5 kg. Linear speed = 6*3.14*50 = 942 m / s

[0018] Total kinetic energy of flywheel = 0.5*10 5 *942 2 =4.4*10 10 Joule = 4.4*10 10 / 3.6*10 6 =12300 degrees

[0019] The frequency modulation energy storage is 1%, which is equal to 123 degrees.

[0020] 3. The diameter of the flywheel and the rotor differ by about 6 / 1.5=4 times. With the same mass, the kinetic energy increases by 16 times.

[0021] Equivalent to 1 million kilowatts * 17 times = 17 million kilowatts generator set.

[0022] 4. According to the ratio of 6:1, one such flywheel can increase wind power by approximately 2.83 million kilowatts.

[0023] 5. How many flywheels does a regional power grid need to add? Currently, it is estimated based on a 6:1 installed capacity ratio.

[0024] 6. Frequency modulation power of 100,000 kWh of frequency modulation energy storage? Frequency modulation power in 10 seconds = 10 5 kWh / 10=3.6*10 7 Kilowatt = 36 million kilowatts. In fact, within 10 seconds, the turbine can still adjust part of the frequency modulation power to about 70 million kilowatts. At present, it is impossible for the power grid to achieve such a large fluctuation.

[0025] It is difficult to count how much frequency regulation energy storage the grid has. Of course, this method is not used to estimate how many flywheels are needed.

Claims

1. my country has 400 million kilowatts of hydropower and 200 million kilowatts of frequency regulation capability within 10 seconds. Wind power fluctuations: When a super typhoon comes, the wind speed is 55 meters per second and the diameter is 1,100 kilometers. It is estimated that 10,000 kilowatts of wind power per square kilometer (1) the wind power fluctuation within 10 seconds is 6.05 million kilowatts, which is far less than the grid frequency regulation capability. (2) In 10 seconds, some wind power can be automatically tripped, so high-frequency accidents are impossible. (3) As for the disappearance of the typhoon, it is gradual, and the wind power fluctuation is even smaller. There are also 1.7 billion hydropower and thermal power in advance, so low-frequency accidents are impossible. (4) The photovoltaic fluctuation is much smaller than that of wind power. (5) Conclusion: The possibility of wind power and photovoltaic power alone causing frequency accidents is very small.

2. Cause of frequency accident 1: The water hammer effect limits the speed of hydropower regulation. It takes about 10 seconds to fully open and close the output. Small power grids have frequency accidents during the start-up and shutdown process of large motors.

3. Cause 2 of frequency accidents: When the frequency changes by ±0.25, the turbine flywheel and the generator rotor automatically release or absorb kinetic energy to compensate for the deficiencies in the adjustment process and prevent frequency accidents. After entering the large grid, there are more flywheels and generator rotors, and there is more than enough compensation. Frequency accidents have rarely been seen in the past 60 years.

4. Cause 3 of frequency accident: Regenerative power installed capacity accounts for 29.5% of the entire network. Frequency accidents recur because power consumption increases, load fluctuations increase, regenerative power has no kinetic energy, and the grid's surplus kinetic energy is used up, causing frequency accidents to recur. The grid can simply add some flywheels or overcome the lack of kinetic energy of regenerative power.

5. Grid frequency regulation and energy storage are difficult to count. In 2021, the installed capacity of generators / wind power will be greater than 6, so it is possible to estimate how many flywheels will need to be added.

6. The increase in renewable electricity and the decrease in thermal power will naturally reduce carbon emissions, just like the invention of the steam engine, which caused the industrial revolution.