Rapid assessment method for transient stability of super-large urban power grid based on dynamic security domains

Abstract

The invention relates to a rapid assessment method for transient stability of a super-large urban power grid based on dynamic security domains, and the technical feature thereof is that the method comprises the following steps: step 1, determine system data in a potential operation mode of the system to form a system differential algebraic equation; step 2, according to the system flow section under the large operation mode, screening heavy-duty lines and substations, and supplementing high-power nodes to solve the pre-fault equilibrium point and form a large disturbance expected accident set;step 3, after generating a transient stability assessment scene set, numbering the assessment scenes and starting the assessment of the dynamic security domains; step 4, determining the measures andfault response time for the expected accidents, searching for a transient stability critical equilibrium point, and calculating the dynamic security domains for each transient stability assessment scene; and step 5, assessing the transient stability of the power grid after the occurrence of the expected accident on the system, and calculating the stability margin. The method can shorten the assessment time of the transient stability of the system and can give a stability margin.

Description

technical field [0001] The invention belongs to the technical field of power grid transient stability margin evaluation, and relates to a method for quickly evaluating power grid transient stability margin, in particular to a method for quickly evaluating transient stability of a super-large city power grid based on a dynamic security domain. Background technique [0002] The security and stability of the power grid is still the primary issue of power production and operation, and cannot be taken lightly at any time. The three lines of defense are the successful experience in ensuring the safe and stable operation of my country's power grid. The construction of the three lines of defense is continuously strengthened, and various stability control devices and safety automatic devices are matched and improved to prevent the chain reaction of accidents, prevent serious damage to the main equipment, and effectively avoid major accidents. Power outage accidents ensure national sec...

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Problems solved by technology

[0003] In view of the situation of large-scale urban power grids subjected to large disturbances, especially the new elements faced in recent years, existing studies often use numerical integration methods to simulate specific faults / fault sets at a given system operating point, and according to This method has serious defects: 1) When the operating point of the system changes, it is necessary to re-run the simulation, which affects the judgment speed of the transient stability of the system, and it is difficult to meet the requirements of online applications; 2) ) Although the stability of the system can be judged through simulation, it cannot give the system stability margin index, which is not conducive to the system operation dispatcher to take appropriate control measures in time; 3) Although based on the historical operation experience, the transient stability of the system can be Make judgments and provide preventive control or corrective control measures, but under new elements such as the injection of large-capacity power (such as UHV substations), operating experience will be difficult to play a role

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