Automatic generation control method for small power grid isolated network operation

Abstract

The invention discloses an automatic generation control method for achieving small power grid isolated network operation. The constraints that under the condition of small power grid isolated network operation, the number of generator sets capable of participating in frequency adjustment is small, capacity is limited, and a frequency adjustment command cannot be responded to continuously within one minute are fully considered, and the new automatic generation control method is provided. The method comprises the steps that based on an aggregative indicator of the primary frequency adjustment speed change rate and adjustment margin of units, adjustment sorting and power distribution are carried out on the units in turn; adjustable generators are evenly distributed within one minute within the safety frequency running range, and one generator is selected to be adjusted every time; more than 2 / 3 of available capacity adjusting units are selected to be adjusted at the same time every time within the non-safety frequency running range. Therefore, on the basis of achieving tracking of low-speed change loads above the minute level, running points and the fast standby capacity are adjusted, a whole small isolated power grid has the optimal primary frequency adjustment response capacity, and fast frequency change tracking and fast load balancing are achieved.

Description

technical field [0001] The invention belongs to the field of automatic power generation control of electric power systems, and in particular relates to an automatic control of a power generation system in a small power grid with a small number of generators and an isolated power grid operation requirement. Background technique [0002] Many high-energy-consuming enterprises with power plants hope to cut off the electrical connection with the external large power grid and generate electricity for their own consumption, that is, to save electricity costs and exempt capacity fees through isolated grid operation, thereby improving the economic benefits of enterprises. Since the number and capacity of generators that can be adjusted in such a grid are limited, and the capacity of a single generator is usually greater than 8% of the total capacity of the grid, it is called a small grid. To achieve the above goals, it is necessary to realize the coordinated and flexible control of ...

AI Technical Summary

Problems solved by technology

[0004] In small power grids, there are very few generator sets that can participate in frequency regulation and power fast balance, often only a few, or even two generators, while thermal power generators have the time interval requirements of minutes to respond to power regulation commands, and usually within minutes Unable to continuously respond to power adjustment commands within 1 minute, especially reverse power adjustment commands

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