Patent ID: 8222845
Filing Date: 2012-07-17
Classification: H02P

Abstract:
1. A method for operating a rotating electrical machine, wherein the rotating electrical machine is connected phase-by-phase to a converter circuit, which has a DC voltage circuit, for switching m voltage levels, where m≧2, the method comprising: (a) connecting phases (u, v, w) of the converter circuit to the DC voltage circuit in accordance with a selected switching state combination (SK (b) starting with a start sampling time k for a selectable number N of sampling times: determining permissible switching state combinations (SK (c) forming switching state sequences (SSK) for each specific switching state combination (SK wherein the switching state combination (SK (d) performing the determining of (b) and the forming of (c) using a field programmable gate array (FPGA); (e1) calculating state intermediate value sets (Y (e2) calculating state value sets (X (f) for each of the switching state sequences (SSK), calculating a torque trajectory (M) of the rotating electrical machine and of a magnetic stator flux trajectory (φ) of the rotating electrical machine using the FPGA from the calculated state value sets (X (f1) if the torque trajectory (M) relating to the k-th sampling time does not exceed a predetermined upper value range limit (y (g) selecting the switching state sequences (SSK (h) for each of the selected switching state sequences (SSK (i) for each of the selected switching state sequences (SSK (j) for each of the selected switching state sequences (SSK (k) setting of a specific switching state combination (SK (l) if the torque trajectory (M) relating to the k-th sampling time exceeds a predetermined upper value range limit (y (m) for each switching state sequence (SSK) and for the sampling time k to the sampling time k+N, determining a maximum value (v (n) for each switching state sequence (SSK) forming a sum (s (o) setting of a specific switching state combination (SK (p) repeating (a) to (o), where k=k+1.