A time-based double band hysteresis current regulation strategy for single-phase multilevel inverters

摘要: Most multilevel inverter hysteresis current regulators use either multiple bands, or a time-based switching logic that forces the error back to zero by recursively stepping through successive voltage levels. Of these two alternatives, approach has merit of only requiring simple analog circuitry and digital implement level selection process for inverters any number However, can be less stable poorer dynamic response than band system. This paper presents double-band regulator uses slope help determine appropriate steady state keep this within inner band, while still allowing extreme states during transient conditions reduce as rapidly possible. The achieves better stability performance previously reported schemes. also an adaptation system control hybrid seven-level inverter. Theory, simulation, experimental results are presented.