DCS-based frequency modulation control method

Abstract

The invention discloses a DCS-based frequency modulation control method, and relates to the technical field of frequency modulation control of generator sets; the method comprises the steps that datacollection and update are carried out on the actual rotating speed and actual power of a generator set; a set rate rotating speed subtracts the actual rotating speed to obtain a rotating speed difference and the rotating speed difference is transmitted to a primary frequency modulation function; an output load setting superposition value is calculated through a low limit group and a high limit group; the superposition value is superposed on a load setting value; the obtained value is transmitted to the input end of a proportional integral regulator; and the proportional integral regulator is in a tracking state, and the superposed load set value is output to a flow command. According to the DCS-based frequency modulation control method, the requirement for primary frequency modulation precision control is met; meanwhile, the primary frequency modulation control strategy is optimized, and the small disturbance signal removal logic greatly reduces the number of times of primary frequencymodulation invalid actions, so that the fluctuation frequency of the high-regulation door is reduced, the stability of the regulation system is improved, the high-regulation-door equipment is protected, and the influence on the AGC regulation process is also reduced.

Description

technical field [0001] The invention relates to the technical field of generator set frequency modulation control, in particular to a DCS-based frequency modulation control method. Background technique [0002] With the gradual commissioning of ultra-high voltage lines and the gradual increase in the capacity of new energy sources such as photovoltaics and wind power, the proportion of thermal power generation units has dropped significantly. The DC blocking of UHV lines and the uncertainty of new energy sources will have a greater impact on the frequency of the grid. Therefore, the primary frequency regulation capability of "friendly energy" thermal power generating units is more important. [0003] Most of the units use the steam turbine speed as the primary frequency modulation control signal. However, the speed parameter accuracy of the unit is poor, and it is difficult to reflect the real fluctuation of the grid frequency in a timely manner when the grid frequency is d...

AI Technical Summary

Problems solved by technology

[0006]However, plug-in systems that are independent of DCS generally have insufficient openness, are not compatible with DCS, cannot conduct timely analysis and optimization, and cannot guarantee long-term excellent control effects; At the same time, the complexity of the control system equipment is increased, the failure rate and equipment investment are increased; the manufacturer needs to continue to maintain and optimize services, and continuously invest in technical service fees and hardware update fees, which increases operating costs.

[0007]At the same time, it is also found that the external primary frequency modulation intelligent control system has insufficient action due to frequent small disturbances, that is, many invalid actions, which leads to the impact of one frequency modulation action on the Instability of automatic generation control (AGC) regulation process

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