Versatile current controller suitable for two-level as well as three-level converters of shunt active power filters: part 2

The current controller of this paper's part 1 has sector change detection limitation for multi-level power filters because of complex voltage space phasor structure. Presented self-adaptive current error space phasor (CESP) based hysteresis controller (HC) does not require point of common coupling voltage vector calculation for identifying sector changes. Here one more hysteresis band is placed a little outside main hysteresis band used for voltage vector selection. Sector changes are detected from CESP movement and outer band comparator state. This versatile sector detection technique is applicable for two-level and three-level filter. Presented controller retains adjacent voltage vector switching. Inherent capacitor voltage imbalance is eliminated by three-level flying capacitor filter's switching redundancy. Controller performance is verified for two-level and three-level filter through simulation studies. The controller is implemented using DSP TMS320LF2407A for two-level filter. Adequate compensation provided by controller in steady state, during transients and for variation in hysteresis band is evident through presented results.

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