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In high power applications, parallel-operated T-type three-level PWM rectifiers have been employed to overcome the power limitation of single rectifier and achieve a flexible operation with improved efficiency. However, zero sequence circulating current (ZSCC) problem emerges when rectifiers are directly parallel-connected in both ac and dc sides. In this paper, the circulating current problem in...
A pulse-width modulation strategy for the three-level photovoltaic grid-tied inverter with common mode voltage reduction is proposed in this paper. In the proposed PWM strategy, both the zero vectors V0 and the medium vector are always selected to comprise the reference vector, and the zero vectors is utilized as the starting vector. Therefore, the amplitude of the common mode voltage is only Udc/6,...
Reactive power compensation of a Static Synchronous Compensator (STATCOM) employing three-level inverter based on diode-clamped was realized using alternation working switch order based pulse width modulation (PWM). The design of alternation working switch order based PWM and its realization based on DSP was described. A scale model simulation of the proposed STATCOM was accomplished to study the...
Three-level pulse width modulation (PWM) scheme is recommended for switching power amplifiers used in digitally controlled active magnetic bearings (AMB) because it allows the amplifier to work at a low switching frequency with relatively low current harmonics. In one four-axis AMB there are usually more than ten switching devices to be controlled. Therefore FPGA is a good platform for the implementation...
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