直流侧电流扰动反映到交流定子侧，也将发生频率偏移。

And the resulted AC current on the DC side will have the similar frequency shift when transfers to the stator of the generator.

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同时，着重分析了峰值电流控制模式下，由于电流扰动和占空比扰动导致系统在占空比大于50%情况下而出现次谐波振荡原因。

And then, we mainly discuss the peak current controlling mode and the sub-harmonic oscillation when the duty cycle exceeds 50%.

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关于交变电流对MHD扰动的抑制作用，从理论上作了分析并从数值上加以证明。

The suppression role of the ac current on the MHD perturbations was analyzed in theory and proved numerically.

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