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Probabilistic optimal power flow calculation method for alternating-current and direct-current systems of offshore wind power plants subjected to VSC-HVDC (voltage source converter-high voltage direct current) grid connection

A VSC-HVDC, AC-DC system technology, applied in the field of probabilistic optimal power flow calculation of AC-DC systems, can solve problems such as inapplicability

Inactive Publication Date: 2015-03-04
HOHAI UNIV
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Problems solved by technology

Due to the randomness and intermittent nature of wind farm output, the traditional deterministic OPF is no longer applicable, so it is necessary to consider the POPF that takes into account uncertain factors

Method used

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  • Probabilistic optimal power flow calculation method for alternating-current and direct-current systems of offshore wind power plants subjected to VSC-HVDC (voltage source converter-high voltage direct current) grid connection
  • Probabilistic optimal power flow calculation method for alternating-current and direct-current systems of offshore wind power plants subjected to VSC-HVDC (voltage source converter-high voltage direct current) grid connection
  • Probabilistic optimal power flow calculation method for alternating-current and direct-current systems of offshore wind power plants subjected to VSC-HVDC (voltage source converter-high voltage direct current) grid connection

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Embodiment Construction

[0048] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and inclusion of the present invention are not limited thereto.

[0049] Modify the IEEE118 node, the system base capacity is 100MW, and modify the lines and generators, replace the conventional generator sets at node 10 and node 73 with offshore wind farms, and keep the rated power unchanged. There is a correlation between the wind speeds of the two wind farms, and the correlation coefficient of the wind speeds of the two wind farms is 0.7. The cut-in, rated and cut-out wind speeds of a single fan are 3m / s, 12m / s and 22m / s respectively, and run at a constant power factor of 0.96. Assuming that the load obeys a normal distribution, the given load data in the calculation example is used as the expected load, and 5% of the expected load is taken as the standard deviation. Install VSC devices at nodes 9, 10, 71, and...

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Abstract

The invention discloses a probabilistic optimal power flow calculation method for alternating-current and direct-current systems of offshore wind power plants subjected to VSC-HVDC (voltage source converter-high voltage direct current) grid connection. The probabilistic optimal power flow calculation method specifically includes: firstly, fitting probability distribution of offshore wind speeds by means of nonparametric kernel density estimation, describing wind speed correlations among multiple wind power plants by a correlation coefficient matrix, and creating a probability model of output power of the wind power plants and a steady-state mode of VSC-HVDC; then, acquiring standard normal distribution samples by the Latin hypercube sampling technology, and acquiring correlated input variable samples according to the equal-probability transformation theory by the Nataf transformation technology; finally, performing deterministic optimal power flow calculation on each group of samples by the primal-dual interior-point method to acquire output variable samples, and acquiring probability distribution and numerical characteristics of output variables by the statistical method. Calculation results of the probabilistic optimal power flow calculation method can well reflect distribution conditions of state quantity and control quantity of optimal power flow of the alternating-current and direct-current systems, and the probabilistic optimal power flow calculation method has the advantages of high speed and accuracy.

Description

technical field [0001] The invention relates to a probabilistic optimal power flow (POPF) calculation method of an AC-DC system including a VSC-HVDC grid-connected offshore wind farm, which is suitable for solving the state quantities and The solution of the probability distribution of the control quantity. Background technique [0002] With the development of the economy, the contradiction between fossil energy and the environment has become increasingly prominent, and the development and utilization of new energy has become a world consensus. As a clean and renewable green energy, wind energy has been more and more widely used in the world. Compared with onshore wind power, offshore wind power has the advantages of high wind speed and low noise. Since the installation of the first offshore wind power demonstration unit in Denmark in 1990, offshore wind power technology has developed rapidly. In 2011, the first flexible DC demonstration project in Asia, the Shanghai Nanhu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 孙国强李逸驰卫志农余爽孙永辉
Owner HOHAI UNIV
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