Comparison of different solutions in predictive control for two PMSM in parallel

Abstract

Abstract This study concerns the power supply in parallel of 2 Permanent Magnet Synchronous Machines (PMSM) with the same inverter, in order to reduce the mass of embedded systems. This operation requires information from the two machines to ensure the stability of the system. Today several solutions address this objective, but about to improve energy efficiency it is important to develop new algorithms. The classical approach is based on a master-slave procedure where the current is controlled only in a master machine and the slave machine is simply connected in parallel. This solution guarantees stability but losses are not minimal. Predictive control applied to this configuration helps to ensure the stability of the system and gives the possibility to reduce Joule losses. In this way 3 predictive control laws are proposed by setting appropriated criteria. The first law uses the concept of master-slave machine, the second is defined with a criterion taking into account the two machines and the third uses the concept of virtual vectors which leads to an implementation of Space-Vector Pulse Width Modulation (SV-PWM). Results are compared in terms of dynamic performances and losses. The algorithms are tested on an experimental low-power test-bench.