作为一种数学解析模型，交流小信号模型对于弧焊逆变电源的数字控制器设计具有无法替代的理论指导意义。
As a kind of mathematical analytic model, AC small-signal model is very important to guide the digital control system design.
基于新的模型，对各种直流开关转换器均能进行直流稳态分析和交流小信号分析。
Based on this new model, steady state DC analysis and small signal AC analysis can be used to analyse all kinds of converters.
然后根据交流侧和直流侧的功率平衡方程，推导了电压环的小信号模型。最后基于该模型设计了一种高动态性能的直流电压调节器。
Subsequently, a novel controller for DC bus voltage regulation is put forward according to the small signal model based on the instantaneous power balance in AC and DC sides of three-phase SAPF.
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