Abstract: The ever increasing number and power of polluting loads (non-linear, time-variant loads and so on) connected to the electric power network cause a significant distortion in the line voltage and line current.

• 文摘:电力系统电网中逐渐增多的“污染性”负荷（如非线性负荷、时变负荷等）正在使电网中的电流、电压出现越来越多的、显著的畸变。