HARMONIC RESONANCE ANALYSIS OF POWER SYSTEMS WITH A WIND POWER PLANT

Abstract

Harmonic resonance phenomenon is a problem paid attention significantly from utilities and electrical engineers for many years. Nowadays, wind power is the leading renewable source, which is considered as the solution for a clean and sustainable resource; however, the integration of wind power plants into grids brings challenges for harmonic resonance study. The objective of this thesis consists of two issues that are determining potential harmonic resonances and resonance paths in power systems connected with a wind power plant. The solution based on deterministic methods has pointed out by comparing pros and cons among available methods in frequency domain including frequency scan analysis, harmonic resonance mode analysis and state-space based method. The thesis selected harmonic resonance mode analysis in the light of the useful information provided by this method. The method is conducted in a practical power systems connected with a wind power plant when the wind power plant is modeled as an equivalent model based on the method that is proposed by National Renewable Energy Laboratory (NREL), which is one of important laboratories of the United States. The simulation results are then verified with field measurement data collected from the first wind farm in Thailand. The verification figures out that the results found by using harmonic resonance mode analysis is valid in harmonic resonance analysis. Moreover, the verification also supports that the equivalent model proposed by NREL is applicable in harmonic studies.