Abstract:

During the action on DEH （digital electro-hydraulic） control system of turbine using a fixed coefficient of quantity, the primary frequency regulation may overshoot or undershoot in the certain load segment, because of the influence of steam distribution characteristics, which seriously affects the qualified rate of primary frequency regulation. Inspired by the nozzle steam flow and work capacity of turbine, this paper presented a design method for primary frequency regulation based on alve point （valve points primary frequency regulation, VPPFR）, in which the action on DEH side was varied according to the correction function of valve point and main steam pressure. Through the practical application, it is showed that this method can obtain the satisfactory qualified rate of primary frequency regulation.

Key words:  thermal power unit, primary frequency regulation, valve point, main steam pressure