From the early stages of human development, wind energy has been used as an energy source. The windmill converts the energy contained in the wind into mechanical energy that can be used for abrasive or pumping. It is possible to manufacture modern wind turbines with up to 5MW of rated power by using modern materials to meet mechanical requirements and the use Sensor of modern electronic components and power electronic components to efficiently deliver power to the main network. In order to optimize the converter, a variety of current sensors in the wind turbine is essential for each converter components. Fossil fuels have always been the preferred energy for power generation. However, many initiatives are moving in the direction of renewable energy as concerns about the sustainability of fossil fuel supply and the focus on greenhouse gas generation, as well as the introduction of carbon dioxide emissions reductions from combustion.
The wind is the result of air mass exchange, mainly caused by the local or even large area temperature difference formed by the solar radiation effect. Obstacles such as forests, mountains and buildings can produce turbulence that affects the long-lasting wind speed. The wind turbine rotor converts the energy contained in the wind into rotational energy, which drives the generator to generate current. Wind energy and thus the amount that can be used is proportional to the wind speed of the cube. There is also a simple correlation between the area Temperature Sensor of the rotor calculated from the rotor diameter and the energy generated from the wind flowing through that area. When the wind speed exceeds a fixed limit, the wind turbine must be equipped with a power controller in order to avoid mechanical and / or electrical overload. In general, the rated power of the generator is a threshold level that must be given attention. In order to provide continuous power to the grid, it is necessary to operate the generator in the best condition, even though the wind speed is changing every second.
The turbines use various power controls. The degree of control can be achieved either passively or actively through the rotor blades. Passive limits can be achieved by a special shape of single rotor blades. At a certain wind speed, so that the rotor rotation of the air suddenly disappeared the so-called stall, the rotor also stops the rotation stall control. Current large wind turbines typically use an active power control system to adjust the rotor blades in their longitudinal axes. By adjusting the blade angle associated with the rotor plane, it is possible to control not only the generator power. At higher wind speeds, the rotor blades can be twisted in a way that the rotor stops quickly. Low-power electrical drives are commonly used for this purpose. In some inverters, small and PCB mount current sensors are used in a wide range of applications. These sensors are part of the converter's closed-loop control and therefore can react quickly. When used in conjunction with intelligent power control of the generator, it is ensured that continuous power is provided ABS Sensor to the grid during a wide wind speed range after the start of the wind turbine until the turbine is shut down at the upper wind speed.
The rotor is always very important to the wind direction. There are two reasons why one can ensure that the air flow passes through the maximum rotor area and thus obtains the most energy from the wind; the second reason is that by ensuring that the rotor blades do not retract and retract in each rotation, thus avoiding the non-uniform load of the rotor blades The Commercial large wind turbines are often referred to as wind turbines, ie the rotor faces the wind in front of the tower, but this is an unstable state. Therefore, the fairing and the rotor must be actively moved to the direction of the wind by the action of the motor. In addition, the brakes can also be used to ensure that the fairing does not twist due to a short change in wind direction. In order to optimize the positioning of the drive, the sensor in each converter to the current continuous measurement. The quality and reaction time of the circuit controller is ultimately determined by the design and performance of the current sensor. This is why closed-loop current sensors with small current ratings are used in this case.
The frequency and voltage of the stator are tightly coupled to the main network. The sliding ring rotor is coupled to the grid through a special inverter, which must be able to transfer energy to the machine and to the grid. The inverter only needs to specify the sliding power, this power is usually only 20% of the rated power of the generator. The wind turbine designed in this way is a variable speed system from sub-synchronization to super-synchronous range. Two identical pulse-controlled IGBT inverters with DC link are used as converters. In either energy transfer direction, one of the converters is used as a rectifier Throttle Position Sensor and the other is used as an inverter, and vice versa. In order to control the power of the grid, in addition to the DC link voltage, but also the need for accurate and rapid current detection. LEM offers a closed-loop current sensor with a medium current rating that is fully suitable for this purpose. These sensors are small and have a variety of different mounting options. In addition, the LEM voltage sensor can be used to monitor and / or control the voltage of the DC link.
By applying a closed-loop principle, a fast-acting sensor can be used to provide short-circuit protection for power semiconductor devices in the inverter - this is inaccurate for offshore wind turbines that are costly and costly to maintain. Current sensors are indispensable components of modern wind turbines.