10Dynamic Average Modelling of Rectifier Loads and AC-DC Converters for Power System Applications
Sina Chiniforoosh, Juri Jatskevich, Hamid Atighechi and Juan A. Martinez-Velasco
10.1 Introduction
The most common type of rectifier load is the conventional three-phase (six-pulse) line-commutated rectifier which is typically used as the input stage in low- to medium-power variable frequency drives and motor loads common in industrial and commercial applications [1–7]. Such loads are often referred to as front-end rectifier loads [8, 9], and may appear in large numbers in distribution systems, industrial facilities [10], distributed generation [11], transportation [12], and arc furnaces [13, 14]. A typical configuration considered in this chapter is shown in Figure 10.1. Depending on the application, the source may be a distribution feeder (or transformer) as in Case I, or a rotating machine (generator) as in Case II. The AC filter network may take various configurations depending on application and cost constraints, among which phase shifting transformers, passive or active filters may be considered to reduce the harmonics. Commonly used passive filters include series choke inductors and shunt filters that are tuned to lower harmonics (typically 5th and 7th) [15, 16].
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