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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 proposes a grid-connected PV system based on the series Z-Source inverter, and also proposes an indirect DC-link voltage control method for the system. The operation principle of the system is presented. The current control strategy is also designed, which makes the output current synchronize with grid voltage, thus the system could transform power to utility grid with a unit power factor...
The implementation of a fast dynamic control scheme for capacitor-supported interline dynamic voltage restorer (DVR) is presented in this paper. The power stage of the DVR consists of three inverters sharing the same dc link via a capacitor bank. Each inverter has an individual inner control loop for generating the gate signals for the switches. The inner loop is formed by a boundary controller with...
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 modern railways coaches, the electrical separation between the high voltage side and the auxiliary equipments on the consumer side is realized by means of heavy and bulky 50 Hz transformers. In order to reduce the weight and size of the devices, today new power supply systems are proposed that consist in soft-switched isolated dc-dc converters with a lightweight medium frequency transformer and...
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