Method for building safety island system according to large unit and large load and stable control method

Abstract

The invention discloses a method for building a safety island system according to a large unit and a large load and a stable control method. The method comprises the steps of 1, determining a bus, a load and a unit forming each safety island; and 2, building n safety islands by the step 1 in a hypothesis way, determining linkage cross section and cross section power of each safety island and a regional power grid, and forming the safety island system. The safety island system comprising a single large unit, a single large load and a single bus is reasonably built in the regional power grid; moreover, safe and stable running of each safety island system formed in the regional power grid is ensured under a fault condition or a normal condition by scientific and effective stable control; andwhen low frequency or high frequency is caused by a regional power grid fault, each safety island is timely split, and the load and the unit in the safety island are enable to be continued to safely and stably run.

Description

Technical field [0001] The invention relates to a method and a stable control method for constructing a safety island system based on a large unit and a large load. Background technique [0002] With the operation and development of more and more regional power grids at home and abroad, affected by national macro policy orientation and the pursuit of high economic benefits, it is becoming more common for large-capacity generating units of 660MW and above and large-capacity loads of 570MW and above to be connected to regional power grids. However, the connection of large units and large loads is easy to form a "large unit, large load, small network", which often causes a series of problems in machine-network coordination and safety and stability control. For a single large-capacity unit to trip, it is often necessary to maintain system stability. The entire network selects the same capacity load removal, because the object is uncertain and the action range is wide, which seriously...

AI Technical Summary

Problems solved by technology

[0002] With the operation and development of more and more regional power grids at home and abroad, affected by the national macro policy orientation and the pursuit of high economic benefits and other factors, it is more and more common for large-capacity units of 660MW and above and large-capacity loads of 570MW and above to be connected to regional power grids. However, the connection of large units and large loads is easy to form a "big unit with large load and small network", which often leads to a series of problems in machine-network coordination and safety and stability control. For a single large-capacity unit trip, it is often necessary to maintain system stability. The whole network chooses the same capacity load to cut off, because the object is uncertain and the action range is wide, which seriously affects the balance of the system; and for the loss of a single large-capacity load, in order to maintain system stability, the same capacity unit is often selected to cut off the whole network, which is easy to cause non-failure Units in the area are cut off, and small-capacity units are often cut off first, which is not conducive to the matching of subsequent imbalances in the system

At the same time, the loss of a black network accident in the regional power grid is huge, and the subsequent black start is highly dependent on the external power grid. There is an urgent need for a scientific and effective means to at least unlist and ensure the protection of a single important large-capacity load and a single large unit when the regional power grid is about to collapse. Safe and stable operation, and reliable black-start power even after severe faults in the regional grid

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