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A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditional CHB inverters. A multilevel voltage waveform of inverter output is generated by an improved phase...
The paper proposes a novel PV power generation system, through employing the quasi-Z source inverter with battery, to balance the stochastic fluctuations of PV power, and smooth the power injected to the grid/ load. The analytical model is built to analyze the power and current relationships among the PV panel, battery, and the inverter output. The capacitor voltage outer loop with a battery current...
In view of the buck and boost capabilities of quasi-Z-Source inverter (qZSI), an application of qZSI to a permanent magnet synchronous generator (PMSG) with wind power generation system (WPGS) is presented. The traditional space vector PWM (SVPWM) technique is modified to satisfy the shoot-through characteristic of qZSI. The closed-loop control of shoot-through duty cycle is designed to obtain the...
This paper presents a motor drive system based on the quasi-Z source inverter (qZSI) to control the pole-phase modulation (PPM) machines. With the inductor-capacitor (LC) impedance network, the qZSI can advantageously use the shoot-through state to obtain any desired output ac voltage. In this paper, the capacitor voltage of the quasi-Z source (qZS) network is controlled to obtain the constant dc-link...
A new PV power generation topology, based on the quasi-Z source inverter (QZSI) with battery, is proposed in this paper. With a battery paralleled with one of the capacitors, this system can smooth the grid-injected/load power when the PV panel outputs a variable power with fluctuations. The battery can be charged or discharged without any extra circuit, because of the unique impedance network of...
This paper proposes a new hybrid nine-level inverter topology for IM drive. The nine-level structure is realized by using two three-phase two-level inverters fed by isolated DC voltage sources and six H-bridges fed by capacitors. The number of switches required in this topology is only 36 where as the conventional nine-level topologies require 48 switches. The voltages across the capacitors, feeding...
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