A method for automatic control of thermoelectric load

Abstract

The invention belongs to the technical field of thermal power plant control, and particularly relates to a thermoelectricity load automatic control method. The method comprises the following steps that firstly, function fitting of the relation between intermediate pressure cylinder steam exhaust pressure upper and lower limit and optimal intermediate pressure cylinder steam exhaust pressure and active power is carried out; secondly, according to the relation between the intermediate pressure cylinder steam exhaust pressure upper and lower limit and the optimal intermediate pressure cylinder steam exhaust pressure and the active power, electric load adjusting limit and intermediate pressure cylinder steam exhaust pressure control standards are determined, and a 175MW above and below thermoelectric load coordinated automatic control scheme and an intermediate pressure cylinder steam exhaust pressure automatic control scheme are built; and thirdly, according to the thermoelectric load coordinated automatic control scheme and the intermediate pressure cylinder steam exhaust pressure automatic control scheme, a valve opening degree control scheme is designed. The unit control scheme isdivided into two large control ranges above and below 175 MW, meanwhile, unit different conditions under two ranges can be analyzed, for each working condition, an automatic control scheme is built, and the automation level and the safe and stable degree of system control can be improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power plant control, and in particular relates to an automatic control method for thermal and electric loads. Background technique [0002] With the continuous optimization and adjustment of my country's energy structure, the proportion of new energy power generation continues to increase. Faced with a series of challenges brought by the access to new energy, thermal power units, as the main frequency regulation device of the power grid, can only overcome the intermittent impact of new energy power generation and stabilize the operation of the power grid through deep peak regulation and auxiliary frequency regulation. At the same time, reducing power generation costs, improving unit efficiency, and participating in power grid low-load frequency regulation and peak regulation are the best ways to maintain the economic benefits of thermal power units. However, the units participating in low-load fr...

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Problems solved by technology

At present, this kind of control can only be adjusted manually, and it is impossible to coordinate the control between valves in the process of thermoelectric load adjustment, which will easily lead to uneven adjustment effects

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