| 摘要 |
An active current injection device (117) is used to generate and inject fundamental and non-fundamental frequency current components onto an AC power line (111). A current pump control circuit (132) receives an input signal which is representative of the line voltage of the power line. In response, the current pump control circuit (132) generates a control signal which is used to generate a current component at the fundamental frequency which lags the line voltage by approximately 90 degrees. This fundamental frequency current component is transmitted through an impedance (131) to the power line (111), thereby causing a voltage drop at the fundamental frequency across the impedance (131) which is within a selected range about the line voltage. This selected range is equal to approximately 25 to approximately 150 percent of the line voltage.
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