The QSS (Quasi Steady State) model of converter which neglects the negative impedance of DC system will bring some errors when unbalanced fault occurs in AC system.
当交流系统发生三相不对称故障时，忽略直流系统负序分量的准稳态模型将给交直流混合系统的仿真带来较大的误差。
Amplitude based methods or phase based methods are usually used in multi-beam bathymetry system and chosen according to some rule, which may bring about unpredictable errors if wrong choose occurs.
多波束测深系统中经常使用幅度法或相位法来进行海底检测，并且按某种准则来选择，但如果选择错误，可能会带来不可预测的误差。
Amplitude based methods or phase based methods are usually used in multi-beam bathymetry system and chosen according to some rule, which may bring about unpredictable errors if wrong choose occurs.
多波束测深系统中经常使用幅度法或相位法来进行海底检测，并且按某种准则来选择，但如果选择错误，可能会带来不可预测的误差。
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