Harmonic Resonance Analysis Method Based on Singular Value Decomposition Theory

To investigate the harmonic resonances in the distributed generation systems, this paper presents a Singular Value Decomposition (SVD) based harmonic resonance analysis method. The main information about harmonic resonance characteristics is extracted from the transfer function matrix that relates harmonic disturbances to output variables. A microgrid with four grid-connected inverters is used as case study, where the transfer function matrix relates the output currents of inverters to harmonic disturbances is formed based on the nodal admittance matrix and it can be extend to large scale systems with more complex structure. The simulations are performed to validate the analysis results by using the proposed method.