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New energy flexible direct current grid connection reliability estimation method

A flexible DC and reliable technology, applied in the direction of AC network circuits, resources, computing, etc., can solve problems such as difficult to meet the precise evaluation requirements of wind energy grid-connected systems, and achieve the effect of improving accuracy

Active Publication Date: 2016-12-21
STATE GRID CORP OF CHINA +1
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Problems solved by technology

At present, the development of new energy sources such as wind energy and solar energy has entered the stage of large-scale commercialization, especially the development of wind energy. With the increase of wind energy development scale, flexible DC grid-connection has become the development trend of wind energy grid-connection, such as figure 1 , wind power generation has typical volatility and intermittent characteristics, traditional reliability evaluation indicators and methods have been difficult to meet the precise evaluation needs of wind energy grid-connected systems

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  • New energy flexible direct current grid connection reliability estimation method
  • New energy flexible direct current grid connection reliability estimation method
  • New energy flexible direct current grid connection reliability estimation method

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Embodiment Construction

[0031] The present invention is described in further detail below in conjunction with accompanying drawing:

[0032] refer to figure 1 , the new energy flexible DC grid-connected reliability estimation method of the present invention includes the following steps:

[0033] 1) Determine the installed capacity of the wind farm, given the failure rate of the wind farm units, and then conduct wind speed sampling, then construct the output model of the wind farm unit according to the results of the wind speed sampling and the installed capacity of the wind farm, and according to the output of the wind farm unit Calculate the unit output of the wind farm based on the model and the failure rate of the wind farm unit, and use the unit output of the wind farm as the power generation of the wind farm unit;

[0034] 2) Calculate the total output of the wind farm units within the simulation time, determine the average output expectation of the wind farm units, and then calculate the ratio...

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Abstract

The invention provides a new energy flexible direct current grid connection reliability estimation method. The method comprises the steps that 1) the output of a wind power plant unit is calculated; 2) the total output of wind power plant units in simulation time is calculated to determine the average output expectation of the wind power plant units, and a calculation result is taken as a wind power plant capacity factor C; 3) a reliability equivalent model of each MMC converter subsystem in a direct current transmission network is constructed; 4) a series-parallel network method is used to combine the reliability equivalent model of each MMC converter subsystem in the direct current transmission network to calculate the unavailability U of the combined direct current transmission network; and 5) the power delivery probability Pout of a wind power plant, the fault blocking power ESF of the combined direct current transmission network and the equivalent forced unavailability rate EUEQ of the combined direct current transmission network are calculated, and the reliability of the direct current transmission network of the wind power plant which accesses the direct current transmission network is estimated. The method can accurately estimate the reliability of the direct current transmission network of the grid-connected wind power plant.

Description

technical field [0001] The invention belongs to the field of power grid planning and relates to a method for estimating the reliability of new energy flexible direct current grid-connected grids. Background technique [0002] With economic development, energy and environmental issues have become increasingly prominent, and the development of renewable energy has become an important choice for countries to implement sustainable development. At present, the development of new energy sources such as wind energy and solar energy has entered the stage of large-scale commercialization, especially the development of wind energy. With the increase of wind energy development scale, flexible DC grid-connection has become the development trend of wind energy grid-connection, such as figure 1 , wind power generation has typical volatility and intermittent characteristics, and traditional reliability evaluation indicators and methods have been difficult to meet the precise evaluation re...

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Application Information

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IPC IPC(8): H02J3/38G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q50/06H02J3/386H02J2203/20Y02E10/76
Inventor 吴延琳孙自安黄宗君杨柳朱岸明刘娟楠刘超张寓涵张鹏
Owner STATE GRID CORP OF CHINA
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