求翻译：3、当电网结构发生变化时装置受电网阻抗的影响不大，不存在与电网阻抗发生谐振的危险，同时能抑制串并联谐振；是什么意思？

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3rd, when the electrical network structure changes installs is not been big the electrical network impedance influence, does not have and the electrical network impedance has the resonant danger, simultaneously can suppress the series-parallel connection resonance;

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3, Fit and affected seriously by impedance of electric wire netting when the structure of the electric wire netting changes, danger of tuning with the impedance of electric wire netting did not exist, can inhibit the series-parallel connection from tuning at the same time;