A new space-vector Hysteresis current-control modulation for active power filter applications
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© 2015 IEEE.The Hysteresis current control (HCC) is a popular modulation technique used in active power filter (APF) applications owing to its simplicity of implementation, fast current response and peak current limiting capability. Despite these advantages, it has a major disadvantage when applied to three-phase isolated neutral point (INP) systems: interphases dependency causes very high-switching frequencies. To overcome this problem, this paper presents a new space-vector hysteresis current control (SVHCC) modulation for APFs when applied to three-phase INP systems. The space-vector-based method allows for the efficient use of zero-voltage vectors and prevents high switching frequencies caused by phase interference. The approach comprises of initially performing two hysteresis bands around the error vector in the aß stationary reference frame (SRF) and then selecting the next voltage vector based on the present location of the error vector to reduce the next error vector. The proposed approach is verified through detailed simulations using MATLAB software.
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