Three-side primary frequency modulation control method and system of heat-supply generator unit

Abstract

The invention discloses a three-side primary frequency modulation control method of a heat-supply generator unit. The frequency modulation diversity factor function is used as the feedforward output of a heat-supply pressure regulator in a heat-supply system to be acted on a steam turbine heat-supply regulating device, the change of the steam flow entering a low pressure steam turbine is used, thechange of forming primary frequency modulation power is increased to the heat-supply generator unit, and primary frequency modulation is carried out by the heat-supply generator unit. On the basis ofthe bilateral common primary frequency modulation of an original coordination side and a speed regulating side, the function of the primary frequency modulation (feedforward) of the heat-supply sideis increased, the function of the three-side (control system) primary frequency modulation is composed, not only meet the increment of fast and continuous power of the primary frequency modulation, but also the heat-supply quality is not affected, finally the throttling loss of a main steam governing valve is reduced, and the generating efficiency of the heat-supply generator unit is enhanced.

Description

technical field [0001] The invention belongs to the technical field of thermal power plant control, and in particular relates to a three-side primary frequency modulation control method and system for a heating generating set. Background technique [0002] At present, most of the units in the power grid are frequency-regulated units. The grid load dispatching center adjusts the power of the frequency-regulated units in the power grid according to the deviation of the grid frequency from the rated value, so that the total power generation and the total load are balanced. This is secondary frequency regulation. Primary frequency regulation is a function of the coordinated control system of the generator set itself. The control system of the grid-connected generator set automatically controls the increase or decrease of the active power of the unit, limits the change of the grid frequency, and maintains the grid frequency. The automatic control process is stable. [0003] Jiang...

AI Technical Summary

Problems solved by technology

3. The method of increasing the sliding pressure setting of the main steam pressure to increase the margin of the primary frequency regulation capability will increase the throttling loss of the main steam regulating valve during operation

The above methods all use the action of the main steam regulating door to realize primary frequency regulation. In the primary frequency regulation and power increase action in the high-load area, the main steam regulating door sometimes has a large opening and the power increment is not enough or not. The value compensation method is that the corresponding speed is slow and the power increment is insufficient; the compensation method on the set value of the heating pressure regulator is to superimpose the setting of the heating pressure regulator. Although the power increment is sufficient, the response is slow and cannot be fully adapted once The rapidity and stability of frequency modulation; the heating pressure change that reacts with the primary frequency modulation after the main steam regulating valve is activated, and the response to the primary frequency modulation is relatively slow when the heating controller is automatically adjusted; the main steam pressure operation sliding pressure curve is set Increase the fixed value to increase the reserve of power increment. Due to the increase of the throttling loss of the main steam control valve in normal operation, this method will sacrifice a large unit efficiency, and the long-term operation will be less economical.

Images