Reactive power optimization method for new energy grid connection

Abstract

The invention relates to a reactive power optimization method for new energy grid connection. The method comprises the following steps of generating scenes, cutting down the scenes, and establishing a reactive power optimization model. The scenes that may occur are used to simulate random variables approximately, the total distribution of the random variables can be reflected via lower sampling frequency, and it is ensured that sampling points are distributed in all sampling areas; and it is avoided that an appeared sample is sampled in the sampling process, and it can be ensured that a low probability area also includes sampling points. The uncertainty of new energy is simulated by the scenes, a calculation scene is obtained by generating the scenes and cutting down the scenes, a combined optimization calculation model is used to obtain reactive power output values Qk of the different scenes, and the reactive power cost and grid loss of the scenes are made minimal under the condition that physical and operation constraints are met.

Description

technical field [0001] The invention relates to a reactive power optimization method for new energy grid connection. Background technique [0002] Renewable energy such as wind energy and solar energy has developed rapidly in China due to its cleanliness, economy, and sustainability. When more and more new energy sources are connected to the grid, the randomness of output power will seriously affect the grid. However, in the electricity market environment, each power generation company pursues its own economic benefits. As a provider of reactive power auxiliary services, power plants generate more reactive power, which will cause loss of generators and Increase the operation and maintenance cost of the generator, and even affect the active output of the generator to reduce the active income. In order to improve the enthusiasm of reactive power investment and encourage each reactive power source to provide sufficient reactive power services, it is necessary to compensate the...

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Problems solved by technology

[0003] Aiming at the current inability to accurately predict wind energy and light energy, the use of a certain output may not be applicable to different scenarios, and the economy cannot be guaranteed. This invention provides a reactive power optimization method for new energy grid connection, which can Better deal with the randomness of wind power plants, and minimize the comprehensive cost of the grid under the condition of satisfying physical and operational constraints

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