| As the electric driving technology especially the high-voltage frequency control technology is developing, the large-capacity and high-voltage frequency control technology has been widely used in the energy saving field. This paper earnestly studies the speed control schemes, analyzes the correlative matters of the high-voltage frequency-control technology, then it compares some different high-voltage frequency control schemes with each other, based on which a condensed water pump frequency control system of 6kV voltage grade is gained for the condensed water pump modification project of the No.6 Unit of Dalate electric power Plant, which has an advanced technology and an obviously economic performance.
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