How to distinguish between synchronous generators and asynchronous generators

generatorThe working principle is to convert mechanical energy into electrical energy. It is usually driven by a steam turbine, a turbine or an internal combustion engine. Generator DC generator and communication generator two categories,

AC generators can be divided into synchronous generators and asynchronous generators.

The most commonly used synchronous generator in modern power plants. It is excited by DC current, which can provide active power and reactive power, which can meet various loads. Asynchronous generators have no independent excitation windings, which is simple to operate, easy to operate, but cannot provide reactive power to the load.

For this reason, asynchronous AC generators must be in parallel with other synchronous generators when running, or quantitatively capacitors. DC generators have commutates, complex structures, expensive prices, easy to fail, difficulty in repair, and efficiency is not as if AC generators. Therefore, in the 1950s, the AC generator gradually replaced by the AC power source semiconductor rectification to obtain a DC generator.