More sophisticated synchronous machine model and the relevant harmonic power flow study

A more sophisticated Park equation-based synchronous machine model, used in harmonic load flow study, is proposed. From the physical interpretation of this model, it can be noticed that synchronous machines should also be con sidered as harmonic sources in power flow study, only if the power network is asymmetrical. This model is then incorporated with the extended 'decoupl ing-compensation' network model used for harmonic power flow analysis. Seve ral cases are studied, including harmonics caused by asymmetry of transmiss ion lines and nonlinear elements like static VAr compensators (SVCs). A com puted result verifies the effectiveness of the proposed model and the concl usion that more sophisticated synchronous machine models should be employed to obtain the correct, full scenario of harmonics distribution in power sy stem is drawn.