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Method for evaluating new energy acceptance capacity of grid-connected point by comprehensively considering stability characteristic

A technology with comprehensive consideration and accommodating ability, which is applied to AC networks with the same frequency from different sources, wind power generation, AC network circuits, etc., and can solve problems such as voltage drop in the station, waste of resources in reactive power compensation devices, and impact on power quality.

Active Publication Date: 2016-11-16
NARI TECH CO LTD +3
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Problems solved by technology

[0003] The in-station planning of wind power stations is mainly about the allocation of reactive power compensation devices. Insufficient reactive power compensation devices will lead to voltage drops in the station, thereby affecting power quality; excessive reactive power compensation devices will cause waste of resources.
In addition, the voltage of new energy grid-connected points will also be affected by load fluctuations in the grid

Method used

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  • Method for evaluating new energy acceptance capacity of grid-connected point by comprehensively considering stability characteristic
  • Method for evaluating new energy acceptance capacity of grid-connected point by comprehensively considering stability characteristic
  • Method for evaluating new energy acceptance capacity of grid-connected point by comprehensively considering stability characteristic

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Embodiment 1

[0055] An embodiment of the present invention, its steps are as figure 1 shown.

[0056] Step 1 describes setting parameters, which include the installed capacity P of the wind power station, the output power model of the wind turbine, the probability model of the load, the probability distribution characteristics of transient stability, and the equal interval number Nmax of the probability density function. in particular:

[0057] Assuming that the wind speed obeys a two-parameter Weibull distribution, its probability model is:

[0058]

[0059] In the above formula, x is the wind speed, a and b respectively represent two parameters of Weibull distribution, a is the scale parameter, and b is the shape parameter;

[0060] Substitute the wind speed probability model into the following formula, and use the following formula to obtain the fan output power model:

[0061]

[0062] In the above formula, P wind is the output power of the fan, W s for the wind speed at ...

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Abstract

The invention discloses a method for evaluating the new energy acceptance capacity of a grid-connected point by comprehensively considering the stability characteristic, and belongs to the technical field of automation of power systems. The influences of wind power generation variability and instability on a power grid, an external load level and the change condition thereof are combined; a multi-machine system is equivalent to a single-machine infinite bus system through an EEAC method by employing a static stability constraint, reactive power control and a transient constraint of the power system as conditions; the stability margin and the sampling yield are calculated; and the capability of connecting a wind power station of considering a transient stability constraint to the power grid to the maximum extent is evaluated by employing the specified range of the sampling yield as an index. By the method, the safe and stable operation level of the wind power station can be improved; the generating capacity of the wind power station is effectively ensured; and the benefits of energy conservation and emission reduction are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular the invention relates to an evaluation method for new energy acceptance capacity of grid-connected points with comprehensive consideration of stability characteristics. Background technique [0002] The shortage of fossil energy and the increasing air pollution have made human beings aware of the importance and urgency of the sustainable development of energy. In recent years, renewable energy such as wind energy and solar energy has been widely concerned and vigorously developed as clean energy. However, the large-scale grid integration of wind energy and solar energy has brought great challenges to the stable operation of the grid due to its volatility and randomness. Variability and uncertainty are two inherent factors in modern power systems. The deterministic power flow analysis method can only analyze specific grid operation conditions, such as th...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/06H02J3/38
CPCH02J3/00H02J3/06H02J3/386H02J2203/20Y02E10/76
Inventor 张昊天陈海飞苗淼王昊昊常康段慧汪马翔陈堂龙黄燕李吉晨郁琛扈卫卫赵明
Owner NARI TECH CO LTD
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