AC Current control system

摘要

In an AC current control system for controlling multi-phase AC currents supplied from a power converter to a load, the currents are detected and coordinate-transformed into orthogonal two-axis current values id, iq in a rotating coordinate rotating at an angular frequency omega , and then compared with the references. The deviations are used to determine two-axis voltage values ed*, eq*, which are coordinate-transformed into multi-phase voltage values determining the output voltages of the power converter. The system is characterized in that the voltage value ed* is determined not only from DELTA id but also from the product of omega and DELTA iq, while the voltage value eq* is determined not only from DELTA iq but also from the product of omega and DELTA id. This arrangement makes it possible to provide a voltage component corresponding to the voltage drop across the inductive component of the load which is 90 DEG in advance of the current.