Electromechanical Transient Modeling Method for Direct Drive Wind Turbine

Abstract

An electromechanical transient simulation modeling method of a direct-drive wind generating set is provided. A model consists of eight modules which are relatively independent in order to facilitate modular programming. The feedback quantity of each module uses a value at a last moment so that respective modules can be programmed according to sequential structure. In a simulation timing sequence process, two current converter modules are subjected to the dq axis fully decoupled assumption so that the d axis and q axis can be independently modeled. In addition, in order to correctly reflect the fault characteristics of a wind driven generator, a low voltage ride through (LVRT) control strategy is used in the corresponding module. In the simulation timing sequence process, a simulation technique combining large and small steps is used so that the rapid dynamic inside the wind driven generator can be accurately reflected. The method solves the problem that an electromechanical transient model of the wind driven generator cannot completely and accurately reflect the transient process of the wind driven generator.

Description

technical field [0001] The invention relates to an electric power system, in particular to a modeling method for a direct-drive wind power generating set used for the electromechanical transient simulation of the electric power system. Background technique [0002] In recent years, wind power has developed rapidly around the world. According to the report given by the Global Wind Energy Council (GWEC), in 2015, the world's newly installed wind power installed capacity was 63GW, and the total installed capacity reached 432.9GW. Therefore, it is very important to study wind power generation technology deeply, and the modeling of wind turbine is one of the very important issues in wind power generation technology. [0003] At present, wind turbines are mainly divided into constant speed and variable speed: constant speed generators are mainly used in early wind power generation; with the development of technology, variable speed generators will become the mainstream type of ge...

AI Technical Summary

Problems solved by technology

[0007] 1) In the dynamic process of the fan, only the slow dynamic process such as the mechanical dynamics of the fan rotor is considered;

[0008] 2) In wind turbine control modeling, only slow control processes such as active power control and pitch angle control are considered;

[0009] 3) The degree of encapsulation is high, the programming implementation is complicated, and there is no developed model parameter interface;

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