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A neutral-point-clamped three-level PWM rectifier is studied in the paper. The naturally decoupled state-space equations in stationary reference frame (α-β) were derived. Furthermore, a new PWM method for input current harmonic of rectifier is presented including asymmetrical regular sampling and DC-bus voltage balancing. The hierarchical controller structure is adopted and can be divided as the inner...
Applications of solid-state converters and inverters for adjustable speed drives (ASDs) are popular in industrial systems and lead to a significant amount of harmonic and interharmonic currents being injected into the connected system. This paper presents an accurate analytical approach for the assessment of the harmonic and interharmonic currents generated by the voltage-source inverter-fed ASDs...
This paper describes a grid-connected photovoltaic (PV) system with the function of active power filter (APF), in which a Z-source network is employed to boost the DC bus voltage during periods when the PV array output is low. After modeling the Z-source network and H-bridge converter, a state space model of Z-source inverter is derived. The model reflects the fact that the Z-source inverter has two...
This paper presents a new harmonic power flow method for the AC/DC converters. The method is based on a unique model for the AC/DC converters. The model transforms the time domain nonlinear characteristics of the converter into a frequency domain linear admittance matrix. The matrix represents the coupling among the converter AC side harmonic voltages and currents accurately. An interesting feature...
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