采用了一种常态下利用双不对称电桥实时监测直流系统绝缘的方法，解决了正负母线绝缘均按比例下降时失效的问题。
A new method is adopted to real-timely monitor DC system insulation, which applies double asymmetrical Bridges to keep it effective when positive and negative pole insulations drop in same proportion.
仿真结果表明，双馈发电机控制系统具有良好的动态控制性能，直流母线电压稳定，波动小，能够满足双馈发电机交流励磁的需要。
The simulation results indicate that the system has good dynamic performance, DC bus voltage is stable and has small fluctuations, and it satisfies the demand of DFIG excitation.
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