Calculation method of primary frequency modulation evaluation index based on comprehensive processing of time points

Abstract

The invention discloses a primary frequency modulation assessment index calculation method based on time point comprehensive processing. According to requirements in state-specified standards of GB / T 30370-2013 and Q / GDW 669-2011, based on the real-time power value and the frequency value of a unit acquired by a power grid main station end, the rotation speed change rate L3 of the unit at a 3s time, the rotation speed change rate L15 of the unit at a 15s time and the rotation speed change rate L30 of the unit at a 30s time are calculated respectively, greatest option processing is carried out on the three calculated rotation speed change rates L3, L15 and L30, the greatest value L is comprehensively used as a rotation speed change rate in the primary frequency modulation performance indexes of the unit for assessment, and whether the primary frequency modulation is qualified is judged. Multipoint rotation speed change rate calculation can be carried out, the primary frequency modulation assessment index effectiveness and the accuracy are enhanced, the unit is ensured to meet primary frequency modulation action working quickness and stability requirements by the power grid, and the power grid is ensured to operate safely and stably.

Description

technical field [0001] The invention relates to the field of unit frequency regulation, in particular to a method for calculating primary frequency regulation assessment indicators based on comprehensive processing of time points. 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 u...

AI Technical Summary

Problems solved by technology

[0014] When the frequency difference of the power grid occurs in the early stage, if the unit does not act or moves slowly, and the load of the unit in the later period reaches the specified requirements, the performance of the primary frequency regulation action of this type of unit will cause the initial frequency drop of the grid fault to be too large, which will cause system instability and occurrence Oscillation will lead to misoperation of distance protection, and if it is more serious, it will directly lead to system disconnection

Or the load of the unit rises rapidly in the early stage of the frequency difference of the power grid, but cannot be maintained at the specified load value, the performance of the primary frequency regulation action of this type of unit is not conducive to the rapid return of the grid frequency to 50Hz

In the above two cases, no matter whether it is calculated according to the rate of change of speed or the integral power of primary frequency regulation, the calculation results may be qualified, and cannot truly reflect the frequency regulation performance of the unit

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