Why are some wind turbines not turning?
Wind turbines are large, spinning structures that generate electricity from the wind. But why aren’t some wind turbines in operation?
This post will look at the numerous causes of this problem and possible remedies. Keep reading to find out more!
Wind turbine blades might cease rotating due to several circumstances, such as rapid or sluggish wind speeds and adverse weather conditions.
The turbines will cease spinning if they cannot get any energy from the wind or if their blades are damaged by too fast movement.
How Often Wind Turbines Turn Their Blades?
Why some wind turbines are not turning? For a variety of reasons, wind turbines can no longer produce power.
Dispersed and unpredictability are the hallmarks of Earth’s wind patterns, first and foremost.
There is no way to anticipate the daily wind speed during the lifetime of the wind turbine.
Even if this were true, it would be unrealistic to expect the wind to blow at appropriate speeds in the vicinity of each wind turbine all year.
Data reveals that the typical wind turbine can generate up to 85 percent of the time.
Many other elements influence how much wind energy each turbine can generate during its lifespan, regardless of how often or quickly its blades spin.
As you can see, a number of frequent scenarios may cause a wind turbine’s blades to cease rotating, all of which are directly tied to the wind speeds on which it is dependent.
However, the frequency of these occurrences will be determined by the size and placement of each particular turbine.
Why Are Some Wind Turbines Not Turning?
People expect wind turbines to be operational at all times. However, this is not always the case.
Wind turbines may sometimes cease rotating. This issue may be caused by various factors, which we’ll discuss below.
1. There Is No Wind
In the first place, there is no wind to spin the turbine. This may be one of the reasons why wind turbines don’t turn.
Perhaps the weather is unusually quiet for this time of year. Perhaps the area is seeing seasonal lulls in wind activity.
In other circumstances, neighboring structures or objects may obstruct most of the oncoming wind.
2. The Wind Is Too Strong
Wind turbines need wind to function, yet too much wind is ineffective.
Wind turbines can only be safely operated up to a particular wind speed, known as the “cut-off wind speed” or “cut-out wind speed.”
Any wind exceeding the limit is too powerful for the mechanism to manage, posing threats to the equipment and the workers.
Most wind turbines and wind turbine generators include built-in sensors and breakers to reduce the possibility of overloading.
These tools assess the wind turbine’s endurance to the present wind speed and determine when to shut down the operation.
As a result, wind turbine blades can no longer take advantage of the incoming wind in certain cases. The generator might get detached from the spinning blades under certain conditions.
In order to prevent overloading, the generator turns off and ceases functioning while the blades continue to revolve.
3. The Speed Of The Wind Is Insufficient
When the wind is strong enough, wind turbines may begin spinning.
Start-off wind speed (sometimes called “cut-in wind speed”) refers to the lowest wind speed needed for a turbine to begin spinning. It is measured in knots.
It indicates the wind speed at which the wind overcomes the mechanical resistance of the turbine and begins producing bits of energy.
This speed varies based on:
- The size
- Mechanical transmission
- Quality maintenance
It is impossible to create a significant amount of electricity from a wind turbine at low wind speeds since the amount of electrical power generated is highly impacted by wind speed.
Despite this, it continues to produce energy.
As a consequence, building a wind turbine with the lowest possible start-up wind speed is always favorable.
When the wind turbine isn’t stationary, it has less time where it can’t make use of incoming energy.
The Big Wind Turbines
It’s a different story for some bigger turbines with massive rotor angular momentum.
The start-up wind speed for these turbines may be so high that allowing the rotor to start up normally is a waste of available wind resources.
As a result, instead of waiting for high enough winds to start their function, they often employ an electric motor to jumpstart the blades’ spinning and then begin collecting the energy of low-speed wind.
4. The Turbine is Under Maintenance
Wind turbines must be shut down for planned maintenance or repair since it is very difficult to do maintenance work on them while they are operational.
Preventing emergency breakdowns and malfunctions by performing routine maintenance on a wind turbine may be the best way to ensure that its normal wear and tear is handled.
A wind turbine must be serviced yearly, depending on how old it is and what weather conditions it regularly runs in.
Each maintenance procedure might span from a few hours to a few days.
This is reflected in the wind turbine’s “availability,” or the period when it is available to function.
When the availability of a wind turbine is 95% year-round, 5% of the time, the wind turbine cannot run even when there is wind.
In turn, availability influences the total power output performance of the wind turbine.
7. The Location of the Wind Turbines
The location of wind turbines influences everything from wind speed to air density.
Land-based windmills will function differently than offshore windmills due to differences in wind patterns and schedules.
In addition to these considerations, you’ll want to ensure your windmills aren’t obstructed by any natural or man-made obstacles such as hills, trees, or buildings.
Some customers may choose dispersed wind systems, which combine the power of numerous smaller wind turbines to produce a higher total output.
8. Wind Turbine Shutdown on Purpose
When you see a wind turbine that isn’t spinning, it’s not because there isn’t any wind; it’s because the turbine has been purposefully turned off.
A turbine may be turned off even when the wind is blowing for a variety of reasons, including:
Some nations use a system known as ‘Constraint Payments.’
This method ensures that even if a power producer is requested to shut down by the National Grid, they are still compensated for the energy they might have created if they had not been forced to shut down.
This offers a consistent cash stream for the generator while also improving the country’s energy security.
Electricity Oversupply On The Grid
The quantity of power utilized nationwide varies; for example, there is much less demand for electricity overnight.
The National Grid must ensure that the quantity of power produced equals the amount used, a process known as ‘grid balancing.’
As energy demand diminishes, the National System will instruct various power plants to reduce their output or shut down to keep the grid balanced.
Shutting down wind turbines is far simpler and less expensive than shutting down a coal-fired power station.
Hence wind farm owners are usually the first to be requested to shut down when the national demand for electricity falls.
When a wind farm operator gets a shutdown notice from the National Grid, the turbines are shut down, even if the wind is still blowing.
How To Turn Off a Wind Turbine
If it is decided that a turbine must be temporarily shut down for whatever reason, there are a few ways that are commonly used to stop the turbine from turning.
Braking by Electromagnetic Force
Slowing down a wind turbine is accomplished by increasing the electrical load (resistance) connected to the turbine’s generator.
This is known as electromagnetic braking, and it is typically the first method used to begin slowing the blades.
Braking by Mechanical (Friction)
This is the same method used in automobile brakes: a mechanical clamp shuts on a revolving disc.
Then the friction of the clamp slows the rotation of the shaft to which the disc is connected until it ultimately comes to a full stop.
Tips For Determining Why A Wind Turbine Is Not Spinning
- There isn’t enough wind for the wind turbine to spin up on its own, and any possible low-wind start-up mechanism isn’t being employed.
- The wind turbine has been disconnected for repair.
- Because the wind farm is already generating enough power, it is unnecessary to operate every turbine.
- The turbine blades are poorly built and will not spin in any wind.
- Too much wind may damage a horizontal wind turbine’s integrity. Horizontal wind turbines may be destroyed by high winds.
Why are some wind turbines not turning?
The blades of wind turbines may get stuck in one position for several reasons, the most common of which are abnormally high or low wind speeds and harsh weather conditions.
If the wind turbines cannot get any energy from the wind or if their blades are in danger of being destroyed by a movement that is too fast, they will automatically cease spinning on their own.
Thanks for reading!