A dynamic equivalence method for wind farms taking into account the dispersion of wind farms and the diversity of units

Abstract

The invention discloses a wind power plant dynamic equivalence method combining wind field disperstiveness and unit difference, comprising the steps as follows: determining a grouping standard for a wind power plant unit according to dispersion characteristic of a wind power plant and difference characteristic of a wind turbine generator in the wind power plant; respectively dividing the wind power plant unit as different clusters according to the grouping standard; respectively adopting different wake flow models to perform equivalent modeling to the clusters of the wind power plant according to the difference of the clusters of the wind power plant; identifying equivalent generator parameter of a equivalent model so as to be equal to electric network impedance in the wind power plant. The invention has the following useful effects: the equivalence method of the invention is more rational in grouping, thereby accurately reflecting dynamic response characteristic of the wind power plant at the grid connected place, and the dynamic characteristic of the model established by the invention at the grid connected place is more close to that of the actual wind power plant.

Description

technical field [0001] The invention relates to the technical field of dynamic equivalence of wind farms, in particular to a dynamic equivalence method of wind farms that takes into account the dispersion of wind farms and the differences of generating units. Background technique [0002] With the continuous connection of large and ultra-large wind farms or farm groups to the grid, wind power has become an important part of the power system. Considering the randomness of wind power, the volatility will significantly affect the dynamic and transient stability of the power system, and the asynchronously operated wind turbine needs to absorb a certain amount of reactive power from the grid side to establish a magnetic field. Therefore, when the grid-connected point of the wind farm fails, There will be a large shortage of reactive power on the system side, and even cause the voltage of the entire network to collapse. As a result, the wind farm has a greater impact on the safe ...

AI Technical Summary

Problems solved by technology

However, this method ignores the dispersion of wind speed, and the accuracy will be affected when it is applied in wind farms with complex terrain and large scale.

[0006] It is not difficult to find that the scope of use of the above-mentioned equivalent modeling method is relatively single, and it is difficult to be used in the modeling of wind farms with complex working conditions. Preserve the complete dynamic characteristics of the wind farm

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