Research On Low Voltage Ride Through Of Brushless Doubly-Fed Wind Power Generator

For the brushless doubly-fed wind power generation system, low voltage ride through(LVRT) is an important part, the voltage dips can cause power winding(PW) and control winding(CW) and rotor winding current increases, but the rotor current in wound brushless doubly-fed generator(BDFG) can not be measured directly, So make it difficulty to control the system. Under the rotor speed coordinate system, build the BDFG mathematic model, and under the power synchronous speed coordinate system calculate the magnitude of the rotor current and simulate the curve of rotor current, analyze its reason to causes it, then design the methods to suppress the fluctuations, it can pass through the low voltage, further more verify the feasibility of the method.