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New energy power station equivalent modeling method based on interaction coefficient of power generating units

A technology of interaction coefficient and power generation unit, applied in the field of efficiency modeling, can solve the problems affecting the transient response of new energy power generation units and high sensitivity of power transmission, and achieve the effect of clear principle, simple operation and reduced dimensionality

Active Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

When the injection rate of these new energy power generation in the system is relatively high, the internal resistance of the access point from the new energy power station into the grid is relatively large, and the voltage of the grid-connected point is highly sensitive to power transmission. When the grid is disturbed, the transient response of the new energy power station will be affected. Its grid-connected point voltage is dynamic, and the dynamic change of the grid-connected point voltage will affect the transient response of the new energy power generation unit. It is necessary to fully consider the possible large differences in the transient response characteristics of the new energy power generation units on the feeder.

Method used

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  • New energy power station equivalent modeling method based on interaction coefficient of power generating units
  • New energy power station equivalent modeling method based on interaction coefficient of power generating units
  • New energy power station equivalent modeling method based on interaction coefficient of power generating units

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Embodiment

[0069] The present invention is applied to the equivalent value of an actual large-scale wind farm, and its detailed model schematic diagram is as follows Image 6 As shown, 134 1.5MW variable speed wind turbines are installed in a 200MW wind farm. The wind turbines in the wind farm are divided into 12 groups, and each group is connected to 11 to 12 units. Each generator is connected to the 35KV overhead line in the form of a single-unit connection unit transformer 0.69 / 35KV. ~12 wind turbines are connected to the 35KV busbar of the step-up substation of the wind farm through a 35KV cable. The electrical main wiring between the wind turbine and the box-type transformer adopts the unit wiring method of one machine and one transformer. The outlet voltage of the wind turbine is 0.69kV, and the box-type transformer is boosted and sent to the 35kV overhead line. A 1kV low-voltage cable is used to connect the low-voltage side of the box-type transformer to the wind turbine. A total...

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Abstract

The invention relates to a new energy power station equivalent modeling method based on the interaction coefficient of power generating units. The method includes the following steps that first, the new energy power generating units connected to one feeder line in a new energy power station serve as the research objects, and the reference value of the interaction coefficient of the two new energy power generating units is determined as K0; second, according to the reference value K0 of the interaction coefficient of the two new energy power generating units, the number N of power generating unit groups on the feeder line and the number of the power generating units in each group are determined; third, an equivalent simplified model of the new energy power station is determined. According to the method, the difference between the transient characteristics of the new energy power generating units is taken into full consideration, and the equivalent simplified model of the new energy power station can accurately simulate the transient response characteristic of grid connection of the new energy power station.

Description

technical field [0001] The invention relates to a method in the technical field of new energy power generation and grid connection, in particular to an equivalent modeling method for a new energy power station based on the interaction coefficient of power generation units. Background technique [0002] The current new energy power generation is a typical intermittent power supply. As more and more new energy power generation is directly integrated into the grid, its impact on the stability of the grid power supply is becoming more and more complex, so it is necessary to analyze and study the stability of the relevant power system. Compared with conventional thermal power units, the single unit capacity of new energy power generation is smaller, and the power system pays attention to the overall transient response characteristics of new energy power plants. When large-scale new energy power generation is connected to the grid and is stable, the equivalent simplified model of...

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Application Information

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IPC IPC(8): H02J3/38
Inventor 迟永宁王伟胜胡家兵汤海雁李琰胡祺田新首王真张占奎魏林君苏媛媛张小瑜白宏孙蔚王志冰
Owner STATE GRID CORP OF CHINA
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