High Order Sliding mode optimal current control of five phase permanent magnet motor under open circuited phase fault conditions

Abstract

Electrical marine propulsion systems are characterized by very high level requirements in terms of compactness, acoustic behavior and reliability. In this particular context, the use of multiphase PM machines associated with VSI drives appears to be a very efficient solution. Presented work focus on the use of such a system in open circuited phase fault conditions. With this kind of system it is possible to determine optimal current references which maximize the torque density of the system when one or two phases are open circuited. Classical linear controllers (as PID for example) cannot provide a correct tracking of these optimal current references because they have a highly dynamical behavior. We propose in this paper to combine this optimal current reference generation with High Order Sliding Mode (HOSM) control. This kind of solution allows a good tracking of these unconventional current references with a fixed switching frequency for the VSI. This method is validated experimentally using a low power experimental setup which associates a 5-phase PM machine with a DSP controlled IGBT 5leg VSI drive.

A fault-tolerant multiphase permanent magnet generator for marine current turbine applications

“…However, in fault mode, the current references have a high dynamic behavior in the natural frame and even in the rotating d-q frames. Linear controller based on the association of the generalized park transform presented previously and the use of PI or PID can not provide a correct tracking of these current references [17]. Moreover MCT are characterized by inevitable uncertainties such as turbulence and swell effects.…”

“…th and 11 th harmonics and SdM family contains the 3 rd , 7 th and 13 th ones [5], [17]. We can then consider that the main machine has p pairs of poles and the secondary machine has 3p pairs of poles.…”

“…To ensure the multiphase generator operation continuity with minimum copper losses when an open phase fault occurs, a new adaptive control strategy has been proposed in [16][17]. In this method the faulty phases are firstly detected.…”

An efficient control of a series connected two-synchronous motor 5-phase with non sinusoidal EMF supplied by a single 5-leg VSI: Experimental and theoretical investigations

“…This axis and these two planes are associated with three fictitious machines (one 1-phase subsystem and two 2-phase subsystems) which are called respectively zero-sequence subsystem, main subsystem machine (MM) and secondary subsystem machine (SM) [18,20]. Each of these subsystems is associated with a particular harmonic family [7,13]:…”

“…These one-phase and two-phase subsystems, which are called fictitious machines, are magnetically decoupled. Moreover, each of these subsystem machines is characterized by a particular harmonic family [19,20,21]. The detailed analysis of a series connection of two 5-phase machines supplied by a single 5-leg VSI is deduced logically from this theory and an efficient control strategy is presented [21,22,23]: it is then easy to understand why it is possible to control independently two machines with sinusoidal EMF even if only one 5-leg VSI is used.…”