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The paper present a MATLAB-SIMULINK model of a single phase 1.5 KVA RMS controlled VSI inverter using MOSFET. The paper describes the behavior of output voltage and current, the total harmonic distortion (THD), with the variation in input dc capacitor (Cdc), Snubber capacitor (Cs) and Snubber resistance (Rs) for linear and non-linear load. The values of Cdc, Rs and Cs as suggested by other authors...
It is known that the interaction between poorly damped LC input filters with constant power loads leads to degradation of dynamic performance and instability of the system. This paper addresses the global stability study of an electrical system containing a DC power supply, an LC Filter and a constant power load. This latter is realized by a voltage source inverter supplying a Permanent Magnet Synchronous...
In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed six-band...
Two current-control strategies based on the sliding mode concept have been introduced for a single-phase current-source inverter feeding a resistive load. The first strategy is based on forming a general switching function using the error variables of the inductor current and capacitor voltage. However, it is observed that this control strategy leads to a steady-state error in the capacitor voltage...
In this paper, voltage mode (VM) and current mode (CM) control are used for controlling the peak dc-link voltage of high-performance Z-source Inverter (ZSI), where the peak DC-link voltage is estimated by measuring the input and capacitor voltages. Both controllers are designed base on small signal model using Bode diagram. The performance of both control methods is verified by simulation of a 30...
Several control strategies have been proposed to deal with the problems of UPS feeding nonlinear loads. To ensure stability and fast response, current components on the LC filter are often used as control variables. Theses currents can be very noisy and unacceptable to work as an stabilization schema. A procedure to deal with measurement problem is developed and shown to be effective. Both simulations...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
Dual mode time-sharing cascaded sinusoidal inverter often has higher efficiency than other type DC/AC inverter. However, for this type inverter adopts a small DC-link chemical capacitor instead of a conventional electrolytic one, the control is easy to be disturbed by the ripple of input DC voltage. This paper proposes a new ldquoreal-timerdquo feed-forward control for the dual mode time-sharing cascaded...
Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that basic PI control system cannot drive the steady-state...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
This paper presents an efficient method to supply single-phase loads with a three-phase induction generator (IG). A combination between a properly controlled voltage source inverter (VSI) and dump load (DL) ensures, besides the phase balancing of the IG, the voltage and frequency regulation. The VSI operates at constant frequency - thus keeping the system frequency also constant - and deals with unbalances...
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