Input Filter Optimisation for a DTC Driven Matrix Converter-Fed PMSM Drive

This paper presents optimisation results of input filter parameters for a Direct Torque Control driven Matrix Converter-fed PMSM drive. The main objective of performed research was to achieve better quality indicators of input filter as compared to the analytic method. DTC method is based on controlling the length and angle of a stator flux linkage vector with MC states chosen from a Switching Table. Therefore, presented method has a variable switching frequency, which makes it difficult to analytically appoint a suitable filter. The optimization was performed using one of the newest metaheuristic algorithms - Cuckoo Search. In the article author proposes an objective function, optimization restrictions and filter quality indicators connected with the power factor, electromagnetic torque error, current drawn from the grid, voltage THD and grid current. As a result of this analysis, best filters were chosen, whose performances were then compared in simulation research. Eventually, a filter appointed by mentioned optimization achieved better results for power factor and grid current distortion indicators. Remaining parameters were similar to those of analytic filter.