A Method for Quickly Calculating the Maximum Length of Collecting Lines in Wind Farms
A technology of collecting lines and maximum length, which is applied in the field of quickly calculating the maximum length of collecting lines in wind farms, to achieve the effect of reducing the complexity of the calculation
Active Publication Date: 2017-04-19
STATE GRID CORP OF CHINA +3
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for quickly calculating the maximum length of the wind farm collector line, which reduces the computational complexity, makes up for the defects of the existing method with excessive errors, and further reduces the Cost in the planning, and make the wind turbines in the wind farm safe and reliable operation
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Embodiment Construction
[0017] Such as Figure 1~3 As shown, the present invention first adopts conventional methods to construct a simple chain structure equivalent wind farm model based on the wind farm to be assessed. The overall structure of equivalent wind farms is figure 1 As shown, it contains n WTGs Taiwan fan, n series Back-chain type power collection line, each power collection line contains n fans, and each fan is connected to the power collection line through the box change, and n excess output rest = N WTGs -n series ·N(n rest series ) A fan is directly connected to the bus on the low-voltage side of the booster transformer. The wind farm is a completely symmetrical structure, that is, the structure and parameters of each collector line are exactly the same, and they are all simple chain structures without T-connections.
[0018] The method embodiment includes the following steps:
[0019] A. Parameter processing of the constructed simple chain structure equivalent wind farm model
[0020...
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The invention relates to a method for quickly calculating maximum length of collecting lines of a wind farm. The method includes: building a simple chain-structured equivalent wind farm model according to the wind farm to be evaluated and determining related parameters; recursively calculating voltage U<2> of a front fan collection site of each collecting line loop and active power P<line2, n-1> and reactive power Q<line2, n-1> of the part from a front (n-1)th segment of the collecting line to the front fan collection site; with length l<n> of an n-th segment, the closest to the step-up transformer side, of the collecting line as a variable, establishing an equation: f(l<n>)=0, about the length l<n> of the collecting line; solving the equation to obtain the length l<n> of the n-th segment, the closest to the step-up transformer side, of the collecting line; calculating maximum length L of a distance from a tail fan of the collecting line to a step-up transformer. The method has the advantages that calculation complexity is greatly decreased, and the defect that the common engineering estimation method has large error is made up.
Description
Technical field [0001] The invention belongs to the technical field of wind power, and specifically relates to a method for quickly calculating the maximum length of a wind power collection line. Background technique [0002] my country's wind power has developed rapidly and has become the country with the most wind power installed capacity. Compared with traditional thermal power units, wind power units in wind farms have a small single unit capacity but a large number. They need to be connected in series through the collection lines in the wind farm to be boosted and sent to the grid. Due to the relatively high R / X value of the collector line in the wind farm, the voltage at the collection point of the wind turbines connected in series on the same circuit will decrease from the end of the series to the head of the series. The longer the collection line, the lower the voltage of the tail unit. The higher it is, the planning and design needs to control the distance from the wind...
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IPC IPC(8): G06F19/00
Inventor 廖国栋李龙源谢欣涛王晓茹
Owner STATE GRID CORP OF CHINA