Power flow constrained harmonic analysis in AC-DC power systems

摘要

When calculating noncharacteristic harmonics generated by an HVDCnconverter, unbalance in the AC system at fundamental frequency and allnharmonics must be taken into account. This entails that a fullnthree-phase load flow be part of the solution, as there is considerablendistortion interaction between the load flow and the converter. To date,nthis has been achieved by iterating sequentially between the load flownand a harmonic converter model, in a type of decoupled method which isnlikely to suffer poor convergence. The decoupled method is implementednhere, and convergence compared with a unified Newton solution of thenload flow and converter models. Finally, the effect of not modelling thendistortion interaction between the two systems is investigated