A dynamic probabilistic power flow calculation method considering wind power connection

A technology of dynamic probabilistic power flow and calculation method, applied in the direction of calculation, electrical components, circuit devices, etc., can solve the problem that the randomness of wind power affects the power system, and the probability model of wind power output is difficult to accurately describe the regularity and correlation of wind power generation. Inability to accurately account for issues such as grid correlation

CN103986156BInactive Publication Date: 2015-10-28STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a dynamical probability load flow calculation method with consideration of wind power integration. A draught-fan output model is established on the basis of the Markov chain and a state scenario tree, draught-fan output historical data are normalized, states are partitioned, and a state transfer matrix is obtained according to the change relations between the states; according to the draught-fan output state at the current moment and the state transfer matrix, the most possible states of the draught-fan output at the next moment and the probabilities of the most possible states are predicted, repeated analysis is conducted, and the state scenario tree in a future period is generated; multi-period and multi-state distribution of the draught-fan output is obtained through the state scenario tree; probability load flow calculation based on the semi-invariant method and improved Von-Mises series expansion is conducted on each time section. Calculation results can reflect the relations between probability load flows of a power grid in different time periods, probability distribution of the draught-fan output states can be reasonably predicted, the change rule of the draught-fan output states is accurately described, and the method is used for comprehensively assessing safety and stability of a power system achieving wind power integration.
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Description

technical field

[0001] The invention belongs to the technical field of power system steady-state analysis, and more specifically relates to a dynamic probabilistic power flow calculation method considering wind power access. Background technique

[0002] In recent years, the demand for electricity has developed rapidly, and the scale of power grids around the world has expanded at an alarming rate. Because of its abundant sources and no pollution to the environment, wind power accounts for an increasing proportion of grid power. However, because the power provided by the wind turbine is affected by factors such as the wind force and wind direction at the wind farm, wind power generation is unstable compared with traditional thermal power and hydropower generation. While it provides clean energy for the power system, it also makes the entire power system It becomes difficult to predict, and the uncertainty is greatly increased, which brings great challenges to the stable ope...

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0021] The invention proposes a dynamic probabilistic power flow calculation method considering wind power access. Firstly, the wind turbine output model is established based on the Markov chain and the state scenario tree. This method uses the Markov chain to deal with the random process of fan output, normalizes the historical data of fan output, divides the states, and obtains the state tran...