A calculation method for grid-connected capacity limit of wind power multi-infeed power system

Abstract

The invention discloses a wind power multi-fed power system grid-connected capacity limit calculation method. According to the wind power multi-fed power system, an extended admittance matrix is obtained through calculation, and the generalized short-circuit ratio and the generalized short-circuit ratio critical value of the wind power multi-fed power system are obtained; whether the absolute value of the difference between the generalized short-circuit ratio and the critical value of the generalized short-circuit ratio meets a given threshold value or not is judged, the micro-increasing rateof the generalized short-circuit ratio of the wind power multi-fed power system relative to the rated capacity of all the wind power equipment is calculated, wherein the wind power equipment is subjected to capacity fine adjustment up-regulation; and calculating the micro-increasing rate again, adjusting the rated capacity of the wind generator equipment again according to the micro-increasing rate, and carrying out continuous iteration processing to obtain the capacity limit. According to the method, the maximum value of the grid-connected capacity of the small-interference-stability wind power multi-fed power system can be obtained, so that guidance is provided for new construction and extension of the wind power generator set, and the comprehensive performance of planning and design considerations of the electric power system is facilitated.

Description

technical field [0001] The invention belongs to the technical field of new energy planning and design, and relates to a method for calculating the capacity of a power system, in particular to a method for calculating the grid-connected capacity limit of a wind power multi-infeed power system. Background technique [0002] In order to actively respond to world crises such as the depletion of traditional fossil fuel energy and global warming, large-scale development of renewable energy has become a global consensus. Wind power generation has become one of the most important renewable energy generation methods due to its mature technology, wide energy distribution and easy access. However, my country's wind energy resources are mostly distributed in Northwest North China, which does not coincide with the load center in the east. The grid structure is weak, and the access of large-scale new energy will significantly affect the characteristics of the AC grid, making the AC grid r...

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Problems solved by technology

However, my country's wind energy resources are mostly distributed in Northwest North China, which does not coincide with the load center in the east. The grid structure is weak, and the access of large-scale new energy will significantly affect the characteristics of the AC grid, making the AC grid relatively weak and prone to small disturbances. Sexuality, which restricts the grid-connected scale of new energy power stations

[0003] The current research does not focus on the multi-point feeding system of new energy units into the AC grid. For example, the research on wind turbines may be considered as a single-point connection to the AC grid (short-circuit capacity ratio index) through an equivalent method, or ignored through overall research. The characteristics at the feed-in point (penetration power limit index) and the stability research at the feed-in point cannot be accurately obtained, so the research on obtaining the grid-connected capacity limit based on the small disturbance stability margin at the feed-in point is urgently needed

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