Start-stop control method and system for grinder set of grid-connected generator

Abstract

The embodiment of the invention discloses a start-stop control method and device for a grinder set of a grid-connected generator. The method comprises the following steps: acquiring the historical data of the start-stop time of the grinder set of the grid-connected generator, and carrying out statistics on the historical data to obtain a time series data set of the historical start-stop time of the grinder set; predicting a time period of the generator load change according to the time series data set of the historical start-stop time of the grinder set; and subtracting the time period of thegenerator load change and the time-consuming period of the grinder set start-stop to determine a start-stop time point for the grinder set in order to start or stop the grinder set at the start-stop time point. The method can carry out more reasonable control on the start time or the stop time of the grinder set, reduce the breakpoints in the start-stop process of the grinder set, and further avoid the inconsistency in the regulating range which is stipulated by the grid-connected generator load and a power dispatching center, due to the breakpoints in the start-stop process.

Description

technical field [0001] The invention relates to the technical field of automatic power generation control, and more specifically relates to a method and system for controlling the start and stop of a mill group in a parallel power grid. Background technique [0002] The automatic generation control system (AGC, Automatic Generation Control) is used to monitor and adjust the load frequency of the power system to control the output of the generator. It is the main way to realize the dispatch automation of the power system. In the power system based on automatic generation control, the grid-connected generator sets track the instructions issued by the power dispatching center within the specified load adjustment range, and adjust the generator output in real time according to a certain adjustment rate to meet the power system frequency and tie-line power control. requested service. [0003] At present, most of the large and medium-sized thermal power generating units in China ...

AI Technical Summary

Problems solved by technology

However, since it takes a certain amount of time to start or stop the grinding group, the grid-connected generator set needs to be delayed for a period of time to reach the unit load required by the AGC command, which will cause a breakpoint in the AGC process due to the start-up and stop of the grinding group, resulting in grid-connected power generation The load adjustment range agreed by the unit and the power dispatching center is inconsistent

For example, the current load of the grid-connected generator set is 480MW. When the AGC instruction requires that the load be increased to 600MW, it is necessary to start a set of grinding groups to increase the load to 600MW. However, it takes a certain time to start the grinding group. It takes 15 minutes to start, so within 15 minutes after receiving the AGC command, the actual load of the grid-connected generator set is still 480MW, and has not reached 600MW, resulting in a process breakpoint within the entire grid that requires load changes

[0004] Therefore, the problem urgently needed to be solved by those skilled in the art is to avoid the process breakpoint caused by the excessively long start-stop time of the grinding group, resulting in the inconsistency between the load of the grid-connected generator set and the compliance adjustment range agreed by the power dispatching center

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