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This paper presents photovoltaic (PV) grid-connected power conditioning systems based on Z-source inverter. Using Z-source network, the system can work within a range of PV array output voltage wider than that of the conventional boost converter. It allows the use of the shoot-through switching state for boosting the input voltage, compensates dead-time effect which causes serious output voltage distortions...
This paper presents the concept of using a new tapped-inductor (TL) Z-source impedance network for implementing Z-source inverters. By replacing the original two inductors found in the classical impedance network with two modified 2-terminal TL cells, output voltage range of the new inverter can widely be expanded. This means a larger gain, which in principle, can be adjusted freely by varying the...
This paper presents a proportional plus resonant controller based single-phase Z-source inverter with LCL-filter for a utility connected system. Proportional plus integral (PI) control of ac systems has steady state error and can be eliminated by a resonant controller which incorporates model of input signal in its loopgain, by internal model principle. Small distributed generation (DG) system with...
This paper deals with the analysis, design and control of a three-level 24-pulse Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) system. A three level VSC operating at fundamental frequency switching (FFS) is proposed with 24-pulse VSC structure to improve the power quality and reduce the converter switching losses for high power applications. The design of three-level VSC...
This paper analyzes the two commonly used current control methods for high power, low switching frequency applications involving half bridge inverter. First, the problem of voltage balancing of two DC link capacitors in the half bridge inverter has been discussed. The two current control methods used for the comparison are hysteresis current control and ramp comparison current control methods. It...
Four new CMOS inverter-based voltage multipliers consisted of PMOS/NMOS pass transistors, inverter circuits, and capacitors are proposed in the paper. The proposed voltage multipliers which combine the functions of rectifiers and charge-pumps improve the power conversion efficiency and reduce the number of passive components therefore they are suitable for the integration. The voltage multiplier with...
High performance voltage and current-source inverters (VSI and CSI) are widely required in various industrial applications such as servo-motor drives, special power supplies, distributed power systems and hybrid electric vehicles. However, the traditional VSI and CSI have been seriously restricted due to their narrow obtainable output voltage range, short-through problems caused by misgating and some...
In this paper a new control algorithm to remove parallel resonance in the power factor correction capacitor banks is presented. The proposed system is based on series inverter with capacitor banks in each phase. The main advantage of this method is fast response to eliminate resonance. Another advantage is the use of a low gain proportional controller, rather than a PI controller, to control the dc...
This paper presents the stabilization of the input DC voltages of five-level flying capacitors (FLFC) voltage source inverters (VSI). We propose a cascade circuit consisting of an FLFC rectifier - an intermediate filter - an FLFC VSI. First, we present the knowledge model and control strategy of our rectifier. The stability problem of the input DC voltages of the inverter is investigated. To remedy...
This paper shows an algorithm to control the DC bus voltage of a Shunt Active Power Filter (SAPF), based on the performance of the Proportional Integral (PI) controller. The power converter topology corresponds to a four-wire three-leg Voltage Source Inverter (VSI) with split capacitor. The algorithm is focused on the voltage control for each capacitor, such that the dc-voltages follow a reference...
This paper presents a novel single-stage charge-pump (CP) power-factor-correction (PFC) electronic ballast for the MH lamps driven with the low-frequency square-wave current to avoid the acoustic-resonance problem. In order to achieve high power factor and meet the IEC regulation, the CPPFC technique is applied to the full-bridge inverter of the conventional electronic ballast. Based on the analyses...
The lifetime and reliability of PV-inverters can be increased by replacing electrolytic capacitors by film-capacitors. Film-capacitors have a lower capacitance per volume ratio; therefore a direct replacement leads to very large and expensive solutions, especially for single-phase applications. This paper presents an active circuit which acts as an interface between the DC-link of a PV-inverter and...
This paper presents the study of a multi-phase induction system for metal disc heating. It proposes a complete electrical and thermal modelling of the whole system in PSim software, with a reduced simulation time. An optimisation procedure allows us to calculate the optimal parameters for calibrating the system in order to obtain a uniform heating of the work piece. This was possible from the knowledge...
This paper explores the possibility of connecting two Wind Turbine Generators (WTG) to the grid using a single three level inverter. In the proposed system the rectified output of one WTG is connected across the upper dc-link capacitor of a standard diode clamped three level inverter. Similarly the rectified output of the other WTG is connected across the lower capacitor. This particular combination...
The following topics are dealt with: body network application; near-field telemetry; LED driver; MOSFET devices; SRAM circuit; light emitting diode; on-chip reference oscillators; CMOS optical receiver; ring oscillator delay; CMOS inverter; NMOS driver; digital DC-DC converter; low power switched capacitor; low power dual-mode pulse triggered flip-flop; VLSI architecture; and thin film transistor.
This paper presents features and advantages of the DC-AC quasi-Z-source inverter (qZSI) for use in electric vehicles. The qZSI with continuous input current and its wide range boosting ability is suitable for this application where a three-phase induction motor should be supplied from a lower battery voltage. At first, the theoretical circuit analysis will be given and on this basis dimensioning equations...
This paper presents a new z-source three phase inverter topology. The proposed topology combines the advantages of a traditional four-switch three-phase inverter with the advantages of the z impedance network (one front-end diode, two inductors and two X connected capacitors). This new topology, besides the self-boost property, has low switch count and it can operate as a buck-boost inverter. In contrast...
Predictive direct torque control for a three-level neutral point clamped inverter is proposed. The main differences between standard direct torque control and the proposed approach are the flexibility and simple algorithm implementation, which does not require complex predefined switching tables nor logic to select among them, as standard direct torque control requires. The dynamic performance is...
The paper studies the possibility of driving an induction coil for induction heating without a matching transformer. The heating inductor is connected directly to the high voltage circuit. The induction heating circuit is composed of a resonant LCR circuit. The heating power could be also controlled by changing the point on the resonant current waveform the energy 'quantum' is supplied.
The DC current rejection of a single phase half-bridge grid-connected inverter with a line-frequency isolation transformer is researched in this paper. The impact of the magnetic dc bias of the transformer is given out from the mathematic model of the transformer in current-mode control. For the half-bridge current-mode inverter, the dc current rejection method is presented based on the relationship...
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