| abstract |
The present invention provides a frequency domain impedance modeling method for wind turbines based on modularization and multi-port. The method decomposes complex wind turbines into several electrical subsystems with multi-port characteristics, and establishes the input-output of each electrical subsystem. Output the frequency domain mathematical model, then use the basic circuit laws to connect the ports of each subsystem, eliminate the intermediate interface variables, and then construct the equivalent impedance model of the entire wind turbine at the grid connection point. The wind turbine frequency domain impedance modeling method proposed by the present invention has the following advantages: 1) Modular modeling, simplifying complexity, simple and clear derivation process, and being able to take into account the influence of each control link; 2) Multi-port frequency domain modeling The model is easy to connect to various subsystems, and the equivalent impedance model of the AC port or DC port of the wind turbine can be easily established considering the coupling characteristics of the AC and DC sides; 3) The model is based on the dq coordinate system, which can take into account the frequency coupling characteristics, and has a relatively high performance. high precision. |