Performance verification of parametric average-value model of line-commutated rectifiers under unbalanced conditions

The wide use of line-commutated rectifiers in large scale industrial applications has created the need for accurate and computationally efficient models in power electronics simulation modeling and simulation programs. The switch-level detailed models of such rectifier systems can be readily implemented using commercially available transient simulation packages. To improve the simulation efficiency for the transient studies, the so-called parametric average-value modeling (PAVM) technique has been developed. The PAVM provides models with accurate steady-state and transient simulation results with considerably lower mathematical complexity and computational burden, avoiding the discrete switching states of converters, making it suitable for large-scale system-level studies. In this paper, performance of PAVM of thyristor-controlled rectifiers is investigated for unbalanced conditions. The results show that the PAVM of thyristor-controlled rectifier provides a good approximation of transient and steady-state operation behavior of the detailed model even under unbalanced conditions while demonstrating improvements in terms of numerical efficiency and simulation speed.