Coal mill unit control method and system

Abstract

The invention provides a coal mill control method and system. The coal mill control method comprises the steps of: when receiving a load increasing command, obtaining an output value of the current coal mill unit, a coal quantity change rate and a number of pre-increased coal mills; calculating an output change value according to the coal quantity change rate and the starting time of the coal mills; calculating a difference value of a higher theoretical output limit of the current coal mill unit and the output change value, determining a first higher output limit of the current coal mill unitaccording to the difference value; adding a lower theoretical output limit of the current coal mill unit with a lower theoretical output limit of the pre-increased coal mills to obtain a first lower output limit of the current coal mill unit; selecting any value from a numerical value interval formed from the first upper output value and the first lower output limit as a starting output value; and starting the coal mills when the output value of the current coal mill unit reaches the starting output value so as to avoid breakpoints in a process of changing a load and ensure the generated power output.

Description

technical field [0001] The invention relates to the field of electric power automatic control, and more specifically relates to a control method and system of a coal grinding unit. Background technique [0002] AGC (Automatic Generation Control, automatic generation control) is one of the paid services provided by grid-connected power plants. , increase or decrease the load, and adjust its power generation output in real time according to a certain adjustment rate, so as to meet the needs of power system frequency and power control of tie lines and users' electricity demand. [0003] At present, most of the large and medium thermal power grid-connected generating units use the direct-blowing pulverizing system as the boiler fuel supply system. The output of the unit is affected by the load change of the generator set. Therefore, the number and output of the coal mills in the coal grinding unit need to be kept in sync with the load of the generator set. The output of the coa...

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Problems solved by technology

[0005] In view of this, the present invention provides a control method of a coal mill unit, which is used to solve the process breakpoint of the load change of the generator unit caused by the start of the coal mill, thereby affecting the power generation output of the generator unit

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