Power HIL Emulation of AC Machines with Parallel Connected ANPC Bridge Arms

Abstract

The paper deals with the development of a Power Hardware-In-the-Loop (PHIL) simulator using parallel connected Active Neutral Point Clamped (ANPC) bridge arms. The parallel connection offers better emulation precision due to the increased number of available voltage levels and the higher apparent switching frequency. The concept to emulate the transient inductance and the inner voltage of an AC machine is introduced and analyzed in a single phase model using interleaved modulation in the parallel arms, and level shifted carriers for the upper and lower side of the arms. The static and dynamic precision of the emulation is influenced by the current balancing applied for distributing the power evenly on the parallel arms. A compromise is required to keep both the emulation and balancing error at low level.