Current balance control in converter for doubly fed induction generator wind turbine system

摘要

Systems (300) and methods (500) for reducing current imbalance between parallel bridge circuits (210) used in a power converter (162) of a doubly fed induction generator (DFIG) system (120) are provided. A control system (176) can monitor the bridge current of each of the bridge circuits (210) coupled in parallel and generate a feedback signal indicative of the difference in bridge current between the parallel bridge circuits (210). Command signals for controlling the bridge circuits (210) can then be developed based on the feedback signal to reduce current imbalance between the bridge circuits (210). For instance, the pulse width modulation of switching devices (e.g. IGBTs 212, 214, 222, 224) used in the bridge circuits (210) can be modified to reduce current imbalance between the parallel bridge circuits (210).