Limit capacity transmission calculation method based on voltage collapse indices

Abstract

The invention discloses a limit capacity transmission calculation method based on voltage collapse indices. The limit capacity transmission calculation method based on the voltage collapse indices calculates corresponding voltage collapse indices according to jacobian matrix information. The parameters can lead the whole power flow deductive process and accurately position a system load state to a power limit point. The jacobian matrix information can further automatically select suitable a power flow deductive step length and guarantee that the whole network load change can fast and accurately approach a system limit point. In addition, the limit capacity transmission calculation method based on the voltage collapse indices omits a parameterization equation, and therefore the phenomenon that calculation of the continuation power flow (CPF) failed because continuation power flow expands singularity of the jacobian matrix is avoided. the jacobian matrix is used as a calculation core by the whole deductive process, each step of the deductive process does not need a whole Newton iteration process, and therefore the whole calculation speed of a algorithm is greatly improved and the problem that the CPF failed because the continuation power flow expands the singularity of the jacobian matrix is avoided, time cost of robustness control in the CPF calculation process is accordingly reduced, and calculation cost is saved.

Description

technical field [0001] The invention belongs to the technical field of large power grid online evaluation, and more specifically relates to a calculation method of limit transmission capacity based on voltage collapse index. Background technique [0002] With the emergence and gradual development of long-distance and large-capacity transmission in my country, long transmission distance and large power supply range are the main characteristics of the development of my country's large power grid, which makes the transmission capacity of my country's main transmission lines mainly depend on the limit transmission capacity of the line . In this environment, the problem of limit transmission capacity has become one of the important evaluation indicators of power system operation. The North American Electricity Reliability Council proposed the concept of Available Transfer Capability (ATC) in the 1990s, and defined ATC as the remaining power transmission that can be used for furth...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for calculating the limit transmission capacity based on the voltage collapse index, aiming at solving the problem of calculation failure encountered in the existing CPF calculation

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