Xue Danhong

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In cascade AC system, the interaction between converters and non-ideal source may cause instability issues, especially when the converters behave as constant power load. From the view of small signal model, the stability issues can be evaluated based on the relationship between the terminal impedance and admittance of sub-modules. Therefore, the stability(More)
The stability issues of cascade systems have been studied for many years. Impedance ratio type criterions in the form of Z<sub>o</sub>/Z<sub>i</sub> or Z<sub>i</sub>/Z<sub>o</sub> have been proposed to solve these stability issues. However, existing ratio type criterions still have problems in some cascade systems. Terminal characteristic of single module(More)
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