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相间功率控制器(IPC)与所连电网之间有发生参数谐振的风险,现有的技术措施为避免发生这一现象减小了IPC参数选择的取值范围。为揭示IPC与所连电网之间发生参数谐振的机理,建立了IPC的π型等值电路。指出,IPC与相连电网之间发生参数谐振的原因是其π型等值电路与所连电网中储能元件等值参数之间满足了谐振条件。IPC支路感抗和容抗参数的取值使得其π型等值电路中的3个阻抗参数是相连电网中储能元件等值参数的10倍及以上时,IPC与相连电网之间发生参数谐振的风险便可以大大降低。以一个含有IPC15的单机系统为例,对提出的参数选择方法进行了仿真验证,结果证明了结论的正确性。
There is a risk of parametric resonance between the inter-phase power controller (IPC) and the connected power grid. The current technical measures to avoid this phenomenon reduce the range of the IPC parameter selection. To reveal the mechanism of parametric resonance between IPC and the connected power grid, a π-type equivalent circuit of IPC was established. It is pointed out that the reason for the parameter resonance between the IPC and the connected power grid is that the resonance conditions are satisfied between its π equivalent circuit and the equivalent parameters of energy storage elements in the connected power grid. The value of IPC branch inductive reactance and capacitive reactance parameters makes the three impedance parameters in the π-type equivalent circuit be 10 times the equivalent of energy storage components in the connected power grid and above, The risk of resonance can be greatly reduced. Taking a stand-alone system with IPC15 as an example, the proposed parameter selection method is verified by simulation. The result proves the correctness of the conclusion.