Method for calculating pitch peak range of combined heat and power generation unit

Abstract

The invention discloses a method for calculating the pitch peak range of a combined heat and power generation unit. The method includes the steps of firstly, determining the unit AGC maximum power output load line, the boiler minimum stable-combustion power output load line and the unit minimum power generation load line under the heat supply working condition through fitting with the unit heat supply and gas pumping flow as the X axis and the unit power generation load as the Y axis according to the thermal performance data and the heat supply and gas pumping flow of the combined heat and power generation unit; secondly, calculating any one of the unit AGC schedulable power generation load lower limit, the unit AGC schedulable power generation load upper limit and the unit AGC schedulablepower generation load range under the heat supply and gas pumping flow according to the unit AGC maximum power output load line, the boiler minimum stable-combustion power output load line and the unit minimum power generation load line under the heat supply working condition determined through fitting in the first step. In the method, by online calculating the schedulable minimum power generation load, the unit load lower limit is expanded as much as possible, and the aim of improving the power grid depth pitch peach capacity in the heating period is achieved.

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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