A Calculation Method of Peak Regulation Range of Combined Heat and Power Units

Abstract

The invention discloses a calculation method for the peak-shaving range of a combined heat and power unit, which includes: Step 1. According to the thermal characteristic data of the combined heat and power unit and the flow rate of heating and extraction steam, the unit heating and extraction flow is taken as the X axis, and the The power generation load of the unit is the Y axis, and the maximum AGC output load line of the unit, the minimum stable combustion output load line of the boiler, and the minimum power generation load line of the unit under heating conditions are determined by fitting respectively; The output load line, the minimum stable combustion output load line of the boiler, and the minimum power generation load line of the unit under heating conditions, calculate the lower limit of the generating load that can be dispatched by the AGC of the unit, the upper limit of the generating load that can be dispatched by the AGC of the unit, and the AGC of the unit under any heating and extraction flow Schedulable power generation load range. The invention can dispatch the minimum power generation load through online calculation, expand the lower limit of unit load as much as possible, and achieve the purpose of improving the deep peak-shaving capability of the power grid during the heating period.

Description

technical field [0001] The invention belongs to the technical field of power generation control of large heat and power cogeneration units, and in particular relates to a calculation method for a peak regulation range of a heat and power cogeneration unit. Background technique [0002] In recent years, the installed capacity of wind power has continued to increase, mainly concentrated in the Three North regions. However, in these regions, especially the northern regions such as Northeast China and Inner Mongolia, the proportion of large cogeneration units in the power grid is high, but their peak-shaving capacity is limited. , During windy seasons and dry seasons, the contradiction between heating supply and receiving wind power is prominent, leading to serious wind curtailment in winter; and with the increasing peak-to-valley difference in power load, especially in the winter heating period, the power grid’s dispatchable power generation load range for units Very small, in ...

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Problems solved by technology

At present, many studies in this area only calculate and derive the relationship between power generation load and main steam flow and extraction steam flow, without fully taking into account the constraints of the minimum exhaust steam volume of the low-pressure cylinder of the steam turbine; If the above-mentioned measuring points are not installed or the measurement is difficult and the accuracy is poor, indirect measurement calculation or correction is carried out for online monitoring, calculation and judgment

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