Learn more about the functions of Wind Power Plants
The structure of a small wind power generation system is generally composed of a wind wheel, a generator, a rudder, and an electrical control part. Conventional Wind Power Plants are mostly composed of induction generators or permanent magnet synchronous generators plus AC / DC converters, batteries, and inverters. When the wind blows, the wind wheel turns, turning aerodynamic energy into mechanical energy. The hub of the wind wheel is fixed on the generator shaft, and the rotation of the wind wheel drives the rotation of the generator shaft, driving the permanent magnet three-phase generator to emit three-phase alternating current. As the wind speed changes continuously, large and small, the current and voltage emitted by the generator also change. The generated electricity is rectified by the controller, and the alternating current is changed to direct current with a certain voltage, and the battery is charged. The DC power output from the battery pack becomes 220V AC power after passing through the inverter and is supplied to users' household appliances.
Wind turbines are divided into grid-connected and off-grid wind turbines according to different applications. Off-grid wind turbines, also known as independent wind turbines, are wind turbines used in areas without power grids, and generally have low power. The independent operation wind turbine generally needs to form an independent operation wind turbine power generation system together with the storage battery and other control devices. This independent operation system can be a few kW or even tens of kw, to solve the power supply system of a village, or it can be a small wind power generator of tens to hundreds of W to solve the power supply of one household.
Due to the randomness of wind energy, the frequency and voltage of the power generated by the generator are unstable, and the battery can only store DC power, and cannot directly supply power to the AC load. Therefore, in order to provide stable, high-quality power to the load and meet the AC load power, it is necessary to add a power conversion device between the generator and the load. This power conversion device is mainly composed of a rectifier, inverter, controller, battery, etc. composition.
