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Power quality based comparative analysis of resonant inverters
Published in Rajesh Singh, Anita Gehlot, Intelligent Circuits and Systems, 2021
Z-source inverter: The characteristic feature of this inverter is the introduction of an impedance tank which comprises two same-valued inductors and capacitors connected in cross connecting the tank with the input source. The simulink model of Z-source inverter is shown in the Figure 66.4. During the condition of high input voltage, the shoot-through zero state is not activated and it acts as a normal buck converter. At the time of low input voltage, the shoot-through zero state of the inverter is activated and the desired output is achieved while acting as a buck-boost converter.
Special Features of SimPowerSystems Models
Published in Viktor M. Perelmuter, Electrotechnical Systems, 2020
Peng, F.Z., Z-source inverter, IEEE Transactions on Industry Applications, 39(2), 504-510, March/April 2003.
Extended Boost Switched-Embedded-Capacitor-Inductor ZSI with Low Voltage Stress on Capacitors and Soft-Start Capability
Published in IETE Journal of Research, 2023
Milad Abbasi, Mohammad Mardaneh, Amir Hossein Eslahchi, Zhaleh Hashemi
Z-Source inverters (ZSIs) are known as suitable options to connect the low voltage dc sources to the electric grid. The Z-source inverter has an X-shape impedance network which connects the inverter main circuit to the dc source. The basic Z-source inverter [1] has discontinuous input current with high voltage stress on capacitors, however the qZSI (quasi-ZSI) [2] solved these two major problems. EZSI (embedded ZSI) [3–5] has a continuous source current with low voltage stress across the capacitors, but EZSI needs two isolated dc sources, thus this topology is a suitable option for photovoltaic – or fuel-cell-powered systems. For increasing the voltage gain of the inverter, various topologies were proposed for the Z-source inverter. Some of these topologies are presented below: Diode -assisted quasi-ZSI (DA-qZSI) and capacitor-assisted quasi-ZSI (CA-qZSI) [6].
Three-phase 3-level Z-source NPC inverter using modified 3D-space vector modulation
Published in International Journal of Ambient Energy, 2022
Unlike the conventional dc-dc converter, Z-source inverter has added advantages like continuos input current, lower rating components and better performance (Abu-Rub et al. 2013). In ZVI, an impedance network is composed of two capacitors, two inductors and a diode placed between the inverter bridge circuit and applied input voltage. This system is much suitable for applications like electric vehicles and renewable energy systems (Peng, Shen, and Qian 2005). Generally in VSI, the short circuit will occur when mitigating the switches placed in a leg, which leads zero output voltage, which is called a shoot-through state (Ge et al. 2013). In ZVI system, a short circuit (shoot through mode) is created intentionally to boost the voltage level of the inverter system and it generates boosted voltage compared to the conventional dc-dc converter system (Liu et al. 2014).
Transformerless three-phase Z-source four-wire voltage source inverter-fed grid-connected PV system
Published in International Journal of Ambient Energy, 2020
Generally the three-phase four-wire system reduces the power quality issues and neutral current value of the system and also improves the power transfer capability of the system (Mohamed and Baiju 2009). In the conventional method, the system requires a separate dc–dc converter for boosting the inverter output voltage. But in the Z-source inverter network boosts the inverter output voltage compared to the conventional output voltage (Palanisamy and Vijayakumar 2020). The Z-source network is the impedance circuit; it consists of two inductors and two capacitors, which are connected in ‘X’ shape. The level of boosted output voltage depends on the designed value of inductor and capacitors (Shuai et al. 2019; Renge and Suryawanshi 2016). To control the Z-source inverter, the shoot through and non-shoot through modes of operation are realised. Based on the shoot through mode of operation, the output voltage of the Z-source inverter is boosted (Zhu, Zhang, and Qiu 2019).