Maximum power supply capability computation method based on N-1 approximation

Abstract

The invention discloses a maximum power supply capability computation method based on N-1 approximation. The method comprises the following steps of: (1) acquiring an initial load Sij, a step length c and convergence accuracy epsilon of a load node, wherein both the c and the epsilon are larger than 0; (2) carrying out whole network main transformer N-1 check on a distribution network to obtain check results; (3) judging whether the check results are all passed, if so, making Sij=(1+c)Sij; if not, Sij=(1-c)Sij; (4) judging whether the step length c is larger than the convergence accuracy epsilon or not, if so, making c= c / 2, and executing the step (2) again; if not, obtaining a load of each main transformer from check output results, and adding the load of each main transformer to obtain a corresponding final TSC value; simultaneously obtaining a result whether the N-1 check of each main transformer is passed or not at the moment. According to the method, the accuracy of methods of various optimized distribution networks utilizing TSC is raised, the construction cost of the distribution network is reduced, and the security of the distribution network is raised.

Description

technical field [0001] The invention relates to the field of calculation of power supply capacity of distribution network, in particular to a calculation method of maximum power supply capacity based on N-1 approximation. Background technique [0002] N-1 security has always been the most important concern in distribution network planning and operation, and the current method mainly uses N-1 simulation verification [1] Under the given load level of the power grid, whether the power supply can be continuously and safely powered when the components are withdrawn needs to be verified case by case. By processing all the case verification results, some safety indicators can be obtained to evaluate power distribution. The security of the network under a certain load level. [0003] The current power supply capacity referred to in the literature is actually TSC (Total Supply Capability, abbreviated as the maximum power supply capacity), and TSC is the maximum load supply capacity ...

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Problems solved by technology

[0006] The present invention finds that the TSC obtained by the existing two types of methods is inaccurate, and the result cannot pass the N-1 verification simulation verification, and makes various methods for optimizing the distribution network based on TSC, such as: distribution network tie line The accuracy of methods such as bottleneck analysis and transformation, evaluation and simplification of communication effectiveness, and distribution network planning will also be reduced accordingly, which will further lead to high construction costs of the distribution network and a decrease in the security of the distribution network. no strong protection

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