Research about the harmonic/inter-harmonic characteristic of grid connected with wind plant based on wide-frequency measurement data

The increasing number of wind power plants and the complexity of their integration have caused various changes of power system and generated lots of harmonic and inter-harmonics. Currently, the research focuses on the study of simulation and theory analysis, lacking of real-time monitoring of the inter- and harmonic components. The wide-frequency measurement technology and related device is presented to monitor the harmonics and inter-harmonic characteristics of grid connected with wind power plants, the characteristics of fundamental, harmonic, and inter-harmonics of grid connected with wind power plant is analyzed. The relationship between typical harmonics/inter-harmonic and wind power output is described, the typical harmonic/inter-harmonic distribution rules and characteristics are compared with each other, which can enhance the understanding of the new characteristics of the grid connected with large scale wind power plants. It can provide a reference for the safety and stability of power grid in the future.