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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...
Multilevel (multicell) converters are candidates of interest for power management applications requiring miniaturization -onchip integration- and/or bandwidth extension - wideband tracking -. This paper proposes a design-oriented model for predicting fast-scale instability occurrence in a 3-level (2-cells) converter, based on extending a ripple-based index previously validated for predicting fast-scale...
Pulse Skip Modulation (PSM) is one kind of modulation modes in power converters, which is different from PWM, PFM. Based on the theory of energy conservation, the energy balance (EB) model for PSM boost converter in DCM (discontinuous conduction mode) is proposed in this paper. Based on the EB model in which all system dissipation is considered, the efficiency of PSM boost converter operated in DCM...
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...
In this paper, the design procedures of a unity power factor pulse width modulated (PWM) rectifier and shunt active power filter (APF) using MATLAB/Simulink blocksets and code generation tools for TMS320F2812 fixed-point digital signal processor (DSP) is presented. A systematic design approach is given to develop a rapid prototype system in a reliable procedure. The design procedure uses Simulink...
For stability investigation of complex power systems, simplified system models are in need in order to reduce the model complexity and the simulation time. In this paper the effect of modelling a voltage source converter (VSC) for traction power system with and without the detailed pulse width modulated (PWM)-switch model is modeled in PSCAD and analyzed. The same disturbance is imposed for the two...
The transient performance of 3-phase 4-wire self-excited induction generator (SEIG) feeding various types of linear and non-linear loads is analyzed in detail. The reactive power of SEIG and the load are being controlled by a 3-phase 4-wire configuration of static compensator (STATCOM). The STATCOM is an insulated gate bipolar transistor (IGBT) based, pulse width modulation (PWM) operated, four-leg...
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