Solar Although the energy radiated by the sun to the earth’s atmosphere is only 1/2.2 billion of its total radiant energy (about 3.75 X 1026W), it has reached 173,000TW, which is equivalent to the energy released by the complete combustion of 5 million tons of coal. Figure 1 shows the energy flow diagram on Earth. […]
Renewable energy electric power generation technologies engineering and application
The basic principles and implementation methods of renewable energy engineering using various renewable energy technologies for electric power generation are described
Renewable energy electric power generation technologies engineering and application
The basic principles and implementation methods of renewable energy engineering using various renewable energy technologies for electric power generation are described
Sun and solar radiation
The sun is the closest star to Earth, and it’s a fiery sphere of gas. Its diameter is about 1.4×106km, its mass is about 1.99×1030kg, and its average density is 1.4×103kg/m³. The main components are gaseous hydrogen and helium, of which hydrogen accounts for about 80%, helium accounts for about 19%, and other elements account […]
Future prospects for wind power
In the past 20 years, the global wind electric power generation has maintained a steady growth momentum. Figure 1 shows the statistics of the cumulative installed capacity of wind power in the world from 1997 to 2014. As shown in Figure 2, it is a statistical graph of the newly installed wind power generation capacity in […]
Problems encountered in the application of wind power engineering
As far as the current development situation is concerned, the main problems in the application of wind power engineering are as follows: (1) The regional and seasonal nature of wind power is very strong. Not all wind farms can be built in all places, but wind energy-rich areas with high wind speeds and long durations are […]
The impact of wind farms on the environment
The development of wind energy has both positive and negative impacts on the environment. During the operation of wind electric power generation, it does not consume any fossil fuels, does not emit any harmful gases, and does not consume water resources, thereby reducing the emission of inhalable particulate matter such as soot and CO2, SO2, […]
Site selection and construction of wind farms
The primary problem in building a wind farm is site selection. The site selection requirements for wind farms are very strict. Usually, the following points need to be considered: (1) Choose a place with abundant wind resources, the annual average wind speed is above 6m/s, and the wind direction is stable, and measure data such as […]
Concept and development of wind farms
The concept of wind farms was proposed in the United States in the 1970s and quickly spread around the world. Today, wind farms have become one of the effective ways to utilize wind energy on a large scale. Due to the low density of wind energy, it is not easy for a single wind turbine […]
Low voltage ride through technology for doubly-fed asynchronous wind turbines
In a doubly-fed asynchronous wind turbine, transient rotor overcurrent and overvoltage caused by voltage sag will damage power electronic devices, and the attenuation of electromagnetic torque will also lead to an increase in rotational speed. As shown in Figure 1, it is the structure of a doubly-fed asynchronous wind turbine with a rotor Crowbar(the Crowbar switch […]
Low voltage ride through technology of permanent magnet synchronous wind turbine
The concept of low voltage ride through and related specifications The so-called low voltage ride-through (LVRT) specifically refers to the voltage drop at the grid connection point of the wind farm due to grid failure or disturbance, within a certain range of voltage drop, wind turbines can be connected to the grid uninterruptedly and provide a […]
Influence of low voltage on wind turbines
Practice has proved that a sudden drop in the voltage of the grid connection point will reduce the output power of the wind turbine, which in turn will cause an imbalance between the input power and the output power, resulting in adverse effects. For different types of wind turbines, the ability to resist low voltage […]