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Transmission Line Protection
PCS-9561 Wind Energy Converter System
Due to the rapid development of computer science and control technologies, wind power technologies have also advanced at an equivalent rate. Wind power generation control methods have evolved from simplex constant pitch stall control to full blade variable pitch and variable speed control. At present, the doubly fed converter system with variable speed and constant frequency control is widely used in the wind power generation market.
The rotor of PCS-9561 is excited by two back-to-back connected VSC converters with PWM. The doubly PWM converters supply excitation current to rotor winding in order to realize the maximum capture of wind energy and the adjustment of stator reactor power output. When the turbine operates at a sub-synchronous speed, power is fed into the rotor and the grid side converter runs as a rectifier while the rotor side converter runs as an inverter, providing the excitation current to the turbine. When the turbine operates at super- synchronous speed, stator and rotor can both feed energy to the grid. If the turbine operates in synchronous status, the generator runs as a synchronous motor and the converter system provides DC excitation to the rotor.