Transient stability strongly-correlated power transmission section identification method for power grid

Abstract

The invention discloses a transient stability strongly-correlated power transmission section identification method for a power grid, and belongs to the technical field of power systems and automation thereof. Different regulation modes are determined based on a transient stability quantification theory for a power system, rules of changes of the transient stability limit of a section along with the power transmission power of another section in different regulation modes are calculated, and transient stability limit influence indexes between different sections are further calculated to identify transient stability strongly-correlated sections in the power grid. The method is favorable for power system scheduling and running staff to master the intrinsic running rules of the system and make a power grid scheduling and running control decision, and the safety, stability and automation level of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof. More precisely, the invention relates to a method for identifying a power transmission section with strong correlation in transient stability of a power grid. Background technique [0002] The gradual formation of long-distance, large-capacity, cross-regional AC and DC transmission and the interconnection of the national power grid, while achieving huge economic benefits, also makes the stability of the power system more complicated, and the economic losses brought to the system under unforeseen major accidents It may also increase substantially, and it will also bring great challenges to traditional stability analysis and control. It is one of the most important responsibilities of the power system operation department to prevent the power system from collapsing and disintegrating, thereby preventing the occurrence of large-scale power outages. [0003] With...

AI Technical Summary

Problems solved by technology

Especially during the transition period of the UHV interconnected grid, the interrelationship of the stability of the transmission section in the network tends to be strengthened, and the interactive influence of the transmission capacity is also increasingly prominent. The stable transmission level of each transmission section is not only closely related to the transmission power of the transmission section. In addition, it is also affected by the transmission power of other transmission sections and the change of grid structure. Under the same fault, different transmission section power levels or grid structures may lead to different instability modes, and the same critical transmission section may also stimulate different Instability mode; the control measures for a certain instability mode may fail or even bring about dangerous negative control effects on other instability modes. Extreme conditions may even stimulate the successive instability of other modes. These factors all affect the safe operation of the power grid. Control poses a great challenge

If there is no overall coordination consideration, it may sometimes be difficult to meet the overall solution to the overall stability of the system by simply adopting simple control means. Even if it can be solved, the solution still has optimization problems

[0004] Studies have shown that many major blackouts that have occurred are related to the transient instability of the system or caused other problems, and post-event analysis shows that many cascading failures and subsequent blackouts are caused by the dynamic process of the power grid. Insufficient understanding of the mechanism and lack of corresponding countermeasures

One of the most important problems in this process is the lack of identification technology for key transmission sections associated with internal stability problems in large power grids

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