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Reactive power optimization method for new energy grid connection

An optimization method and new energy technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, special data processing applications, etc. Small, increase the speed, reduce the effect of the number of scenes

Inactive Publication Date: 2016-01-13
RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +1
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  • Abstract
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  • Claims
  • Application Information

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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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  • Reactive power optimization method for new energy grid connection
  • Reactive power optimization method for new energy grid connection
  • Reactive power optimization method for new energy grid connection

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Embodiment Construction

[0043] Attached below figure 1 And attached figure 2 Specific embodiments of the present invention are described in detail:

[0044] In this example, it is assumed that the forecast error of the output of the wind farm conforms to a mean value of 0 and a standard deviation of σ w normal distribution of . Scenario generation technology uses a large number of samples to approximate random variables with possible scenarios.

[0045] 1. The scene generation process is as follows: Assume that the cumulative distribution function of the random variable X (power) of the new energy power station is F(X), and the sampling process is as follows:

[0046] Firstly, the distribution function is equally divided into N parts with the number of samples, and the width of each interval is 1 / N. Random sampling is performed inside each interval, and the cumulative probability value of sampling in the i-th interval is

[0047] Where U is a random number in the interval [0,1]. When any sub...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18G06F17/50
CPCY02E40/30
Inventor 田鑫张杰李雪亮李海周牛新生赵龙王艳高晓楠朱秀波赵光锋刘晓明曹相阳杨斌杨思高效海王男张丽娜薄其滨
Owner RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER
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