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This year's No. 7 typhoon "Higaus" made landfall in the coastal area of Zhuhai. When it landed, the maximum wind force near the center was 12 (35 m/s), and the lowest pressure in the center was 970 hPa. The Central Meteorological Observatory issued an orange warning for typhoons. There were heavy rains to heavy rains in the cities and counties of the Pearl River Delta, Maoming, Yangjiang, and Yunfu, and local heavy rains. Affected by the typhoon, many places in Guangdong have suspended work and classes, all trains on the Guangzhou South Railway Station to the Shenzhen-Zhanjiang Railway have been suspended, and more than 80 flights in Guangzhou, Shenzhen, Zhuhai and Zhan have been cancelled.
Typhoon weather brings inconvenience to people's daily life, but while causing damage, typhoon can also play a role in regulating hot weather. Fundamentally speaking, a typhoon is a huge body of energy. The rapid movement of a typhoon consumes a lot of energy. As the typhoon makes landfall, it cannot replenish the lost energy from the land and will eventually die out.
A typhoon has a huge amount of energy that is much greater than that of an atomic bomb. A mature typhoon can drop 20 billion tons of water a day. The heat released by water condensation is equivalent to the energy of 500,000 Hiroshima atomic bombs dropped in 1945.
Can typhoons be used to generate electricity?
A study by the Atlantic Ocean and Meteorological Laboratory (AOML) of the United States shows that the kinetic energy generated by a mature typhoon is “equivalent to half of the global power generation.” As the pioneer of new energy, wind power has rapidly landed in inland and coastal areas. Taking root, showing the strong momentum of sparks. So, based on the current technical situation of wind power, can typhoons be reasonably used for power generation?
From a purely energy point of view, the greater the wind speed, the more conducive to power generation. However, the wind wheel used for power generation does not require excessive power. The torque generated by the rotation of the wind wheel only needs to balance the electromagnetic torque of the back-end generator and keep the wind wheel within a certain speed range.
On the contrary, when the wind speed gradually increases to threaten the safety of the unit, power generation has become a secondary purpose. At this time, the rapid flow of air causes the unit to bear huge pressure (wind load). Once improperly handled, the above-mentioned "flying car" appears. Under such circumstances, it will lead to catastrophic accidents such as broken blades and overturning of the whole machine.
During the landing of a typhoon, the most dangerous factor is not only the strong wind, but also the chaotic and changeable wind direction, and the latter poses a greater threat to wind turbines. When the wind turbine senses that extreme wind conditions are about to come, in addition to quickly braking and locking the main shaft of the wind turbine, it also needs to turn the head according to the wind direction to minimize its projection area in the direction of the incoming flow and minimize the impact. Wind area.
Although due to the deflection force of the geostrophic force, the typhoon that landed in the coastal areas of our country rotates in a counterclockwise direction, the flow inside the typhoon wall is extremely turbulent and the wind direction is complex and changeable. This proposes a control strategy for the unit Stricter requirements. In addition, the landing process of typhoons is often accompanied by short-term heavy rainfall, and the simultaneous lightning and thunderstorms will also pose a great threat to the reliability of wind turbines.
What kind of typhoon can "turn wind into treasure"?
Generally, when a typhoon with a wind power of less than 10 levels arrives, it can bring good power generation benefits to the wind farm.
According to the performance indicators of large wind turbines and my country’s current typhoon forecast regulations, typhoons that land in my country can generally be divided into three categories: benefit type, defensive type and destructive type:
Benefit type: Affected by the periphery of the typhoon, the maximum wind force is below level 10;
Defensive type: Affected by the periphery of the typhoon, the maximum wind force is between 10 and 11;
Destructive: Affected by the periphery of the typhoon, the maximum wind force is above level 12.
The “Hygos” landed this time has a maximum wind force of 12 (35 m/s) near the center and a minimum air pressure of 970 hPa. It is a "destructive" typhoon. At this time, beware of damage to the generator fan under strong winds.
Beware of wind turbine damage during typhoon
A typhoon is a strong tropical cyclone. The huge energy contained in the typhoon will impose the superimposition effect of static and dynamic loads on the wind turbine equipment structure, forming periodic oscillations. If the period is close to the natural vibration period of the wind turbine (or an integer multiple), The blades were cracked, torn, broken, the yaw and pitch systems were damaged, and even the tower fell, which eventually caused damage to the unit. In the wind power industry, in the face of frequent typhoons, how to reduce the losses caused by disasters has become the primary issue that must be resolved.
In order to reduce costs, improve power generation efficiency and the service life of the wind turbine tower, the wind turbine tower needs to be inspected regularly. The engineering quantity includes the maintenance of the blades, the anticorrosion of the tower, and the repair and maintenance of the tower fan.
For wind power companies, "there is no foresight, there must be immediate worries." To prevent typhoons, they must start from the selection of wind power equipment, equipment resistance and pre-site selection to prevent problems before they occur.
