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Method for calculating probability power flow of power system containing wind farm

A power system and probabilistic power flow technology, which is applied in computing, electrical components, circuit devices, etc., can solve problems such as large errors and probabilistic power flow

Inactive Publication Date: 2013-07-17
HOHAI UNIV
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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problems in the above-mentioned prior art that the wind farm is treated as a simplified PQ model with constant power factor, the condition that the node injection quantities required by the semi-invariant method are independent of each other and the error is relatively large and Insufficient, the purpose of the present invention is to provide a kind of calculation method that contains the probability flow of the power system of wind farm, can effectively reduce the error that semi-invariant method solution brings when conventional wind farm is processed as the simplified PQ model of constant power factor

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  • Method for calculating probability power flow of power system containing wind farm
  • Method for calculating probability power flow of power system containing wind farm
  • Method for calculating probability power flow of power system containing wind farm

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[0090] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0091] The probabilistic power flow calculation of the power system with wind farm based on the asynchronous machine RX model proposed by the present invention includes the following steps:

[0092] Step 1: Calculate the probability distribution of wind farm power and load power.

[0093] Step 2: Use Newton's method to calculate the deterministic power flow of the power system with wind farms, and obtain the sensitivity matrix S 0 .

[0094] Step 3: Calculate the semi-...

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Abstract

The invention discloses a method for calculating the probability power flow of a power system containing a wind farm. The method comprises the following steps of: 1, calculating the power of the wind farm and probability distribution of load power; 2, calculating deterministic power flow of the power system containing the wind farm by a Newton method, and solving a sensitivity matrix S0; 3, calculating the each-order cumulant of each node injection vector; 4, solving the each-order cumulant of a state variable according to the each-order cumulant of the injection vector; and 5, solving a probability density function and a cumulative distribution function according to Gram-Charlier series expansion. By the method, errors caused by solving through a cumulant method when the wind farm is processed as a simplified PQ model with a constant power factor can be effectively reduced.

Description

technical field [0001] The present invention relates to a method for calculating the probability flow of a power system with a wind farm, in particular to a method for calculating the probability flow of a power system with a wind farm based on the RX model of an asynchronous wind generator (abbreviated as "asynchronous fan" or "asynchronous machine") , suitable for power systems with wind farms including asynchronous wind turbines. The invention can reduce the error of solving by the semi-invariant method when the conventional wind farm is treated as a simplified PQ model with constant power factor. Background technique [0002] With the large-scale wind power grid-connected operation worldwide, the impact of wind power grid-connected on the power grid has become a research hotspot in the current power system. The randomness of wind energy makes the results provided by the deterministic analysis method too conservative. Taking into account the randomness of wind power grid...

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Application Information

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IPC IPC(8): H02J3/00G06F19/00
Inventor 赵晋泉叶君玲邓晖
Owner HOHAI UNIV
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