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This paper proposes modeling and control system design for PV based Quasi-Z-Source Inverter (QZSI) for grid connected applications. The control system is designed based on the dynamical characteristics of the converter and introduces two cascaded controllers. Firstly, output current controller designed in the stationary frame. The second is DC-link voltage controller. Also, Modified Direct Incremental...
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Current harmonics produced by power converters are strictly limited to ensure power quality in renewable energy integration systems. Quasi Z-source Inverter (qZSI) is used in such systems as a single stage Buck-Boost DC-AC converter. In this paper, the harmonic performance of space-vector modulated (SVM) three phase grid-tied qZSI is investigated. Traditional SVM and Modified-SVM schemes are analytically...
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This paper presents modeling and control of quasi Z-source inverter (qZSl) for a particular amount of dc to ac power conversion to supply isolated electrical load. Necessary analysis and design of qZSI is included in this paper. This qZSI is capable of supplying three phase, 50 Hz, 400 V, 50 KW power load. In this context voltage boosting (DC: 273V to AC: 400Vrms) and DC to AC power (50 KW) conversion...
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Energy Procedia > 2016 > 90 > C > 250-259
This paper presents the modeling and controlling the power of Quasi Z-Source cascaded H-bridge multilevel inverter for grid connected photovoltaic systems. The Quasi Z-Source inverter is an inverter that provides buck / boost output along with DC-AC conversion in a single stage. This topology has numerous advantages which makes it reliable and suitable for PV applications. Due to the impedance network...
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This paper is about an electro-thermal model to estimate the semiconductors junction temperature of bidirectional quasi Z-source inverter. Firstly, three types of averaged loss models are presented and compared. In the presented model the impact of the output current waveforms on the loss calculation is considered. Then, based on the instantaneous power loss and developed thermal model, junction temperatures...
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This study presents a novel inverter with high voltage gain based on asymmetrical Γ-Z-source topology. It employs one diode, one inductor and two capacitors more than the basic structure that obtains higher output voltage with reduced duty ratio. So, a reasonable modulation ratio is needed to gain desired boost factor which improves the network power quality. In this structure, unlike other Z-source...
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This paper proposes a new conceptual control method for three-phase quasi-Z-source inverter (qZSI) - operating under the One Dimension q-Z-Source Inverter (ODqZSI) which is based on the Single-Phase Modulator technique. The notable feature of the proposed control scheme compared with the space vector modulation strategy is its inherently reduced computational processing time. The obtained simulation...
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In this paper, discontinuous space vector pulse width modulation for a five-phase quasi Z-source inverter is presented. Two schemes are introduced for the continuous SVM of five-phase qZSI (SVQ1 & SVQ2) and two schemes of discontinuous SVM (DSVQ1 & DSVQ2) are proposed SVQ1 method is based on subtracting the shoot-through state interval from the zero state interval only. While SVQ2 subtract...
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3G means distributed generation, micro grid, and smart grid has become a popular topic and is developing rapidly due to energy shortage. The energy requirement in the world is ever increasing due to the increase in population and their standard of living. There exists a gap between power generation and power demand. The energy demand imposes several challenges on the conventional fossil fuels like...
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Electric Power Systems Research > 2015 > 125 > Complete > 164-173
In this paper, a quasi Z-source Inverter (qZSI) is presented for the application in parallel operation of Battery Energy Storage Systems (BESSs) in microgrids. The qZSI is a single stage converter with two controllable DC ports. In the proposed control method to parallel battery stacks, in islanded mode of microgrid operation, the BESS supplies the load power, while the shoot-through duty cycle of...
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In this paper, novel inverters based on the extended Z-source inverter introduced in literature are presented. The extended Z-source inverter is divided into two groups: the diode assisted extended boost continuous current QZSI and the diode assisted extended discontinuous QZSI. In order to increase the voltage transfer gain in both cases, the number of capacitors, inductors and diodes should be increased...
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One cycle control method to control the DC-link voltage is proposed for three phase quasi Z-source inverter. The diode voltage is chosen as a switched variable. A sine-triangle PWM method is used as a modulation method The shoot-through is inserted when triangular carrier crosses positive and negative reference line respectively. The total shoot through time will be decided by one cycle controller...
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In this paper, a power electronic interface (PEI) system is presented to paralle two energy storage battery units with difference current and voltage ratings. The PEI system is based on quasi Z-source inverter (qZSI) which is a single-stage ac/dc converter with two controllable DC ports. In non-controlled parallel operation of battery systems, the load current is shared between them according to their...
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This paper presents a new control strategy for a bidirectional quasi-Z source inverter (qZSI) used as the interlink converter in hybrid AC/DC microgrids. The proposed strategy provides the maximum constant boost (MCB) for the qZSI in the islanded and gird-connected modes of microgrid operation. The MCB is also fulfilled for the transition of the microgrid between the two modes. Furthermore, as opposed...
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In this paper, a Quasi Z-source Inverter (QZSI) drawn from Z Source Inverter (ZSI) is analysed and designed. Two different pwm control techniques i.e. simple boost pwm controlwith sine carrier and simple boost pwm control with triangular carrier are used for producing the pulses for quasi z-source inverter. It employs an impedance network which couples the renewable energy source (dc source or battery)...
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This paper proposes the new quasi impedance source inverter with increased boosting capability for solar water pumping system. The extended self boost quasi impedance source inverter has the advantage of increased boosting potential compared to the Z-source inverter and is expandable. This topology uses the same modulation technique that is adopted for the original ZSI. The proposed self boost inverter...
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DC microgrids for power combining and distribution are of interest in many applications due to their high efficiency, relatively low cost of installation and operation, freedom from harmonic and reactive power and stability. The quasi Z-Source Inverter (q-ZSI) is a particularly promising circuit for DC Distributed Power System (DPS) because of its unique buck-boost characteristics, high power handling...
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2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC) > DS3d.2-1 - DS3d.2-6
This paper presents the study of a new switched-inductor quasi-Z-source inverter topology (SL-QZSI) with high boost voltage. The proposed topology is derived from the old quasi-Z-source inverters by replacing of the input side inductor by two additional inductors and three diodes. This inverter has several advantages, such as, lower component ratings, a common ground with the dc source, reduced capacitors...
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We present the design of 3-phase transformerless grid connected Quasi Z-Source Inverter with minimal leakage current, suitable for application in solar photovoltaic systems. A modified space vector pulse width modulation technique with a reduced number of commutations per sector was used to minimize the leakage current without adding extra circuitry (filters and/or leakage current isolation/bypass...
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Many renewable generation units (e.g. PVs, fuel cells, small wind turbines) require integrated DC-AC converters providing efficient high step-up power conversion. On the basis of recent developments in impedance source (Z-source) inverters the present paper proposes an integration of quasi-Z-source inverter (qZSI) with a built-in high frequency transformer. Two new type LCCT-Z-Source inverters are...
