Converter Control Circuit for Doubly-Fed Induction Generator Rotor Side

The converter control circuit on the rotor side of doubly-fed induction generators plays a central role in wind power generation systems. This control circuit primarily regulates rotor current to facilitate power exchange between the generator and grid while maintaining speed control. Its core objective is to ensure efficient operation of doubly-fed generators under varying wind speed conditions through precise converter modulation, while sustaining stable grid connection.

The control circuit typically comprises several key components: First, the current loop control responsible for tracking rotor current reference values, commonly implemented using PI regulators for rapid response. Second, power decoupling control utilizing coordinate transformation techniques (such as dq transformation) to convert AC quantities into DC components, thereby simplifying control logic. Finally, the grid synchronization unit ensures the converter output maintains frequency and phase alignment with grid voltage.

Although there may be optimization opportunities in circuit design, particularly regarding dynamic response or harmonic suppression, this configuration provides the fundamental framework for rotor-side control of doubly-fed generators. In practical applications, parameters require adjustment based on specific operating conditions, with additional consideration for redundant protection measures (such as overcurrent and overvoltage protection) to enhance system reliability.