Probability static safety analysis method considering flow-and-sensitivity consistency equivalence

Abstract

The invention discloses a probability static safety analysis method considering the flow-and-sensitivity consistency equivalence. The probability static safety analysis method includes the steps that basic data of a whole network is input, wherein the basic data comprises parameters and connected relations of system elements, the dividing condition of an internal network and an external network and the available rate of all the elements; equivalent networks are built according to a static equivalent method considering the sensitivity consistency and the element-type comprehensiveness, and the parameters of all the equivalent networks are calculated; according to the N-1 principle, the internal-network system states are sampled with the state enumeration method, whether the network topology is split or not is analyzed, and whether branch circuits or nodes exceed the limit or not is calculated and judged in a flow mode; the probability safety index of a system and the elements is synthetically calculated and compared with the result obtained based on the conventional on-hook equivalence theory. By means of the probability static safety analysis method, the comprehensiveness of equivalent elements can be described, the operating condition of the practical external network can be well simulated, the suitable power and voltage support can be provided for the internal network, the original large-scale external network is replaced with a small-scale network, and the calculation efficiency of probability static safety analysis is improved.

Description

technical field [0001] The invention belongs to the field of probabilistic static security analysis of electric power systems, and in particular relates to index calculation of intranet probabilistic static security analysis considering equivalent models, and in particular to a probabilistic static security analysis method considering equivalent values ​​of power flow and sensitivity consistency. Background technique [0002] With the vigorous development of new energy, the continuous advancement of the power market, and the continuous growth of loads, the power system has gradually developed into a large interconnected power grid with hierarchical partitions and close connections between each partition. Due to the increasing mutual influence among the subnets, the influence of the Internet and the extranet must be considered effectively when analyzing and making decisions on the subnet under study (that is, the intranet). However, due to the large scale of the interconnecte...

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Problems solved by technology

This method directly analyzes and calculates the entire network. For large-scale systems, the calculation time is long, the calculation amount is large, and it may even be difficult to converge.

In the probabilistic static security analysis of actual projects, the equivalent value of the external network is often used as an injection current, that is, the simple equivalent machine method is used. This method cannot consider the consistency of power flow and sensitivity, and cannot effectively guarantee when the system changes. System static security analysis

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