Primary frequency regulation control method applicable to thermal generator set of intelligent power grid

Abstract

The invention discloses a primary frequency regulation control method applicable to a thermal regulator set of an intelligent power grid. By the aid of the primary frequency regulation control method, frequency regulation performances of the set are effectively improved, stability of primary frequency regulation action is maintained, and frequency fluctuation of a system is reduced. The primary frequency regulation control method applicable to the thermal generator set of the intelligent power grid includes that a primary frequency regulation power compensation value multiplies a modification function to be corrected, the modification function consists of correction factors for characteristics including front pressure, rated pressure and valve flow, real-time computation is carried out by the aid of the modification function according to a state of the set when primary frequency regulation is not actuated, a back switching block generates a self-holding loop after the primary frequency regulation action, state parameters of the set during the primary frequency regulation action are kept, the modification function keeps unchanged, certain swinging of load is avoided, and stability of the primary frequency regulation action is maintained.

Description

technical field [0001] The invention relates to a primary frequency modulation control method for a thermal power generating set adapted to a smart grid. Background technique [0002] With new energy connected to the grid, load growth and the scale of the grid continue to increase, under the new situation of the interconnection of the UHV grid and the regional grid, the connection between the grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between the grid and the unit are also increasing. The higher the value, the primary frequency regulation in the network plant coordination function becomes one of the effective means to stabilize the power grid. The primary frequency regulation function of the generator set is an inherent function of the turbogenerator set. It is mainly through adjusting the steam inlet control door of the DEH system and using the heat storage of the boiler. When the power grid is abnormal, it can ...

AI Technical Summary

Problems solved by technology

[0003] The control function framework of the primary frequency modulation of the unit is basically a simple differential linear adjustment, that is, the corresponding static function of the frequency modulation amount is set in the load control logic according to the technical requirements of the grid-connected documents, and it does not take into account the thermal power unit during operation. Due to the dynamic characteristics and changes of operating parameters, the existing primary frequency regulation control strategy does not fully consider the consistency of the response capability of the next frequency regulation of different parameters of the unit, resulting in insufficient response range or excessive adjustment of the primary frequency regulation. The main reason is that the primary frequency regulation The range of change is a response under the rated parameters of the unit, but in the actual operation process, affected by the unit’s operating parameters, operating mode and boiler operating status, the pressure before the unit cannot meet the corresponding requirements; in addition, the flow rate of the DEH adjustment valve is not The influence of linear characteristics on the primary frequency regulation performance of units is often overlooked. Many units in the network fail to standardize and regularly adjust the valve flow compensation curve, resulting in different openings of steam turbine control valves. The unequal rate will change correspondingly, so that the actual action range of the primary frequency regulation is not adjusted enough or overshoots, and it is difficult to take into account the primary frequency regulation capability of the whole load range.

Images