Journal articles: 'Impedance-source converters'

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Ado, Muhammad, Awang Jusoh, and Tole Sutikno. "Asymmetric quasi impedance source buck-boost converter." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 2 (April 1, 2020): 2128. http://dx.doi.org/10.11591/ijece.v10i2.pp2128-2138.

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An impedance source buck-boost converter (BBC) prototype for renewable energy (RE) application in the transportation industry is proposed. Its functions include stabilizing the variable output voltage of the RE sources such as fuel cells and photovoltaic cells. The converter utilized a topology of DC-DC quasi-impedance source converters (q-ZSCs) to achieve the gain curve of the BBC. With BBC gain curve, the converter earned advantages over the two other classes of non-isolated DC-DC q-ZSCs. These advantages include ecient buck-boost capability at the ecient duty ratio range of 0:35-0:65 and continuous and non-zero gain at the ecient duty ratio range. The converter's q-ZSC topology implies using two capacitors and two inductors. These two capacitors and inductors formed two separate LC filters that provides second order filtering compared to the first order filtering in BBC. Its other advantages over the traditional BBC include elim-ination of dead and overlap-time, simple contol and permitting higher switching frequency operation. The converter is capable of utilizing high switching frequency and asymmetric components to achieve BBC gain by using smaller components to reduce cost, weight and size. Its simulation response and that of a correspond-ing BBC for some given specifications were compared, presented and analyzed. An experimental scaled-down prototype was also developed to confirm its opera-tion. Analysis of the converters responses comfirmed the prototype's second order filtering as against the first order filtering in traditional BBC.

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Sreenu, Sapavath, Jalla Upendar, and Bogimi Sirisha. "Analysis of switched impedance source/quasi-impedance source DC-DC converters for photovoltaic system." International Journal of Applied Power Engineering (IJAPE) 11, no. 1 (March 1, 2022): 14. http://dx.doi.org/10.11591/ijape.v11.i1.pp14-24.

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This paper proposes the switched impedance source converter (SZSC) or switched quasi impedance source DC-DC converter (S-qZSC) based photovoltaic (PV) grid-connected systems. To increase the voltage from low level to high level, all PV grid-connected systems need step-up DC-DC converters. This step-up factor can be increased by connecting the terminals of a traditional quasi impedance source DC-DC converter with an additional diode and a switch. In this proposed converter, the capacitor not only serves as a filter. It is, however, bound in series to the charging loops of the inductors. On the one hand, saturated inductors can trigger instability, which can be avoided. When used for dc-ac conversion, however, the modulation index of the backend H-bridge can be set to a wider range. As compared to existing Z-source-based systems, a shorter duty period results in a higher boost factor.

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Saravanan, V., K. M. Venkatachalam, M. Arumugam, M. A. K. Borelessa, and K. T. M. U. Hemapala. "Review of impedance source power converter for electrical applications." International Journal of Advances in Applied Sciences 10, no. 4 (December 1, 2021): 310. http://dx.doi.org/10.11591/ijaas.v10.i4.pp310-334.

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<p>Power electronic converters have been actively researched and developed over the past decades. There is a growing need for new solutions and topography to increase the reliability and efficiency of alternatives with lower cost, size and weight. Resistor source converter is one of the most important power electronic converters that can be used for AC-DC, AC-AC, DC-DC and DC-DC converters which can be used for various applications such as photovoltaic systems, wind power systems, electricity. Vehicles and fuel cell applications. This article provides a comprehensive overview of Z-source converters and their implementation with new configurations with advanced features, emerging control strategies and applications.</p>

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Gadalla, Brwene Salah, Erik Schaltz, Yam Siwakoti, and Frede Blaabjerg. "Analysis of loss distribution of Conventional Boost, Z-source and Y-source Converters for wide power and voltage range." Transactions on Environment and Electrical Engineering 2, no. 1 (January 1, 2017): 1. http://dx.doi.org/10.22149/teee.v2i1.68.

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Boost converters are needed in many applications which require the output voltage to be higher than the input voltage. Recently, boost type converters have been applied for industrial applications, and hence it has become an interesting topic of research. Many researchers proposed different impedance source converters with their unique advantages as having a high voltage gain in a small range of duty cycle ratio. However, the thermal behaviour of the semiconductor devices and passive elements in the impedance source converter is an important issue from a reliability point of view and it has not been investigated yet. Therefore, this paper presents a comparison between the conventional boost, the Z-source, and the Y-source converters based on a thermal evaluation of the semiconductors. In addition, the three topologies are also compared with respect to their efficiency. In this study the results show that the boost converter has higher efficiency than the Zsource and Y-source converter for these specific voltage gain of 2 and 4. The operational principle, mathematical derivations, simulation results and final comparisons are presented in this paper.

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Rabkowski, Jacek. "SiC Power Devices in Impedance Source Converters." Materials Science Forum 897 (May 2017): 701–4. http://dx.doi.org/10.4028/www.scientific.net/msf.897.701.

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This paper discusses issues related to application of SiC power devices to new family of power converters. Impedance source converters show unique feature, buck boost characteristics due to specific impedance network. Passive elements of this network may be seriously reduced with the switching frequency increase, possible with fast-switching SiC transistors. On the other hand, switching conditions of the power devices are more severe than in traditional voltage-source or current-source converters. These issues are discussed on the base of the 6kVA/100kHz quasi-Z-source inverter example.

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Husev, Shults, Vinnikov, Roncero-Clemente, Romero-Cadaval, and Chub. "Comprehensive Comparative Analysis of Impedance-Source Networks for DC and AC Application." Electronics 8, no. 4 (April 5, 2019): 405. http://dx.doi.org/10.3390/electronics8040405.

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This paper presents a comprehensive analytical comparison of the impedance-source-based dc-dc and dc-ac converters in terms of the passive component count and size, semiconductor stress, and range of input voltage variation. The conventional solution with a boost converter was considered as a reference value. The main criterion of the comprehensive comparison was the energy stored in the passive elements, which was considered both under a constant and predefined high frequency current ripple in the inductors and the voltage ripple across the capacitors. Main impedance-source converters with or without a transformer and with or without inductor coupling were analyzed. Dc-dc and dc-ac applications were considered. Selective simulation results along with experimental verification are shown. The conclusions provide a selection guide of impedance-source networks for different applications taking into account its advantages and disadvantages.

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Quester, Matthias, Fisnik Loku, Otmane El Azzati, Leonel Noris, Yongtao Yang, and Albert Moser. "Investigating the Converter-Driven Stability of an Offshore HVDC System." Energies 14, no. 8 (April 20, 2021): 2341. http://dx.doi.org/10.3390/en14082341.

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Offshore wind farms are increasingly built in the North Sea and the number of HVDC systems transmitting the wind power to shore increases as well. To connect offshore wind farms to adjacent AC transmission systems, onshore and offshore modular multilevel converters transform the transmitted power from AC to DC and vice versa. Additionally, modern wind farms mainly use wind turbines connected to the offshore point of common coupling via voltage source converters. However, converters and their control systems can cause unwanted interactions, referred to as converter-driven stability problems. The resulting instabilities can be predicted by applying an impedance-based analysis in the frequency domain. Considering that the converter models and system data are often confidential and cannot be exchanged in real systems, this paper proposes an enhanced impedance measurement method suitable for black-box applications to investigate the interactions. A frequency response analysis identifies coupling currents depending on the control system. The currents are subsequently added to the impedance models to achieve higher accuracy. The proposed method is applied to assess an offshore HVDC system’s converter-driven stability, using impedance measurements of laboratory converters and a wind turbine converter controller replica. The results show that the onshore modular multilevel converter interacts with AC grids of moderate short-circuit ratios. However, no interactions are identified between the offshore converter and the connected wind farm.

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Salehi, Navid, Herminio Martínez-García, and Guillermo Velasco-Quesada. "Modified Cascaded Z-Source High Step-Up Boost Converter." Electronics 9, no. 11 (November 17, 2020): 1932. http://dx.doi.org/10.3390/electronics9111932.

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To improve the voltage gain of step-up converters, the cascaded technique is considered as a possible solution in this paper. By considering the concept of cascading two Z-source networks in a conventional boost converter, the proposed topology takes the advantages of both impedance source and cascaded converters. By applying some modifications, the proposed converter provides high voltage gain while the voltage stress of the switch and diodes is still low. Moreover, the low input current ripple of the converter makes it absolutely appropriate for photovoltaic applications in expanding the lifetime of PV panels. After analyzing the operation principles of the proposed converter, we present the simulation and experimental results of a 100 W prototype to verify the proposed converter performance.

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Wang, Xiongfei, Yun Wei Li, Frede Blaabjerg, and Poh Chiang Loh. "Virtual-Impedance-Based Control for Voltage-Source and Current-Source Converters." IEEE Transactions on Power Electronics 30, no. 12 (December 2015): 7019–37. http://dx.doi.org/10.1109/tpel.2014.2382565.

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Fu, Xiao, Huaibao Wang, Xiaoqiang Guo, Changli Shi, Dongqiang Jia, Chao Chen, and Josep M. Guerrero. "A Novel Circulating Current Suppression for Paralleled Current Source Converter Based on Virtual Impedance Concept." Energies 15, no. 5 (March 7, 2022): 1952. http://dx.doi.org/10.3390/en15051952.

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The circulating current is one of the important issues for parallel converters. It affects the system stable operation and degrades the power quality. In order to reduce the circulating current of the parallel converter and reduce the harmonic pollution to the power grid, a new circulating current suppression strategy is proposed for the parallel current source converter without any communication line. This strategy is able to realize the current sharing between parallel modules by changing the external characteristics of the parallel modules to thus suppress the circulating current among the parallel current source converters. The proposed control strategy adopts DC-side droop control and AC-side virtual impedance control. The DC-side droop control is used to generate the reference voltage of each parallel module, while the AC-side virtual impedance is used to the circulating current suppression. We performed a time domain test of the parallel converter, and the results show that the proposed control strategy reduced the RMS circulating current of the parallel converter by 50% and effectively reduced the grid-side current THD while ensuring the stable operation of the converter. The effectiveness of the proposed control strategy was, therefore, verified.

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Wang, Xiongfei, Lennart Harnefors, and Frede Blaabjerg. "Unified Impedance Model of Grid-Connected Voltage-Source Converters." IEEE Transactions on Power Electronics 33, no. 2 (February 2018): 1775–87. http://dx.doi.org/10.1109/tpel.2017.2684906.

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Dongbing Zhang, D. Y. Chen, M. J. Nave, and D. Sable. "Measurement of noise source impedance of off-line converters." IEEE Transactions on Power Electronics 15, no. 5 (September 2000): 820–25. http://dx.doi.org/10.1109/63.867670.

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Li, Yuye, Kaipei Liu, Xiaobing Liao, Shu Zhu, and Qing Huai. "A Virtual Impedance Control Strategy for Improving the Stability and Dynamic Performance of VSC–HVDC Operation in Bidirectional Power Flow Mode." Applied Sciences 9, no. 15 (August 5, 2019): 3184. http://dx.doi.org/10.3390/app9153184.

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It is a common practice that one converter controls DC voltage and the other controls power in two-terminal voltage source converter (VSC)–based high voltage DC (HVDC) systems for AC gird interconnection. The maximum transmission power from a DC-voltage-controlled converter to a power-controlled converter is less than that of the opposite transmission direction. In order to increase the transmission power from a DC-voltage-controlled converter to a power-controlled converter, an improved virtual impedance control strategy is proposed in this paper. Based on the proposed control strategy, the DC impedance model of the VSC–HVDC system is built, including the output impedance of two converters and DC cable impedance. The stability of the system with an improved virtual impedance control is analyzed in Nyquist stability criterion. The proposed control strategy can improve the transmission capacity of the system by changing the DC output impedance of the DC voltage-controlled converter. The effectiveness of the proposed control strategy is verified by simulation. The simulation results show that the proposed control strategy has better dynamic performance than traditional control strategies.

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Aldhaheri, Ahmed, and Amir Etemadi. "Adaptive Stabilization and Dynamic Performance Preservation of Cascaded DC-DC Systems by Incorporating Low Pass Filters." Energies 11, no. 2 (February 15, 2018): 440. http://dx.doi.org/10.3390/en11020440.

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This paper proposes a method to stabilize and enhance the dynamic performance of a cascaded DC-DC system by adaptively reshaping the source output impedance. The method aims to reduce the ratio of the source output impedance to the load input impedance, referred to as the minor loop gain, to eliminate the interaction between the load and the source systems. This interaction can deteriorate the dynamic performance or might lead to instability. Thus, the bus current is used to improve the dynamic performance by reducing the magnitude of the source’s output impedance adaptively according to the loading condition such that the dynamic performance is consistently improved. Utilizing the bus current facilitates the compatibility between the proposed controller and most widely used DC-DC converters controlled in voltage mode, including non-minimum phase converters. In addition to the flexibility the bus current provides to embed the proposed solution with conventional control schemes. Experimental results have validated the effectiveness of the proposed controller along with time-based simulation and theoretical analysis, for minimum and non-minimum phase converters.

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Cespedes, M., and Jian Sun. "Impedance Modeling and Analysis of Grid-Connected Voltage-Source Converters." IEEE Transactions on Power Electronics 29, no. 3 (March 2014): 1254–61. http://dx.doi.org/10.1109/tpel.2013.2262473.

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Chub, Andrii, Dmitri Vinnikov, Frede Blaabjerg, and Fang Zheng Peng. "A Review of Galvanically Isolated Impedance-Source DC–DC Converters." IEEE Transactions on Power Electronics 31, no. 4 (April 2016): 2808–28. http://dx.doi.org/10.1109/tpel.2015.2453128.

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Teixeira, Carlos Coelho, and Helder Leite. "Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis." Energies 14, no. 12 (June 17, 2021): 3610. http://dx.doi.org/10.3390/en14123610.

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Voltage source converters (VSCs) are self-commutated converters able to generate AC voltages with or without the support of an AC connecting grid. VSCs allow fast control of active and reactive powers in an independent way. VSCs also have black start capability. Their use in high-voltage direct current (HVDC) systems, comparative to the more mature current source converter (CSC)-based HVDC, offers faster active power flow control. In addition, VSCs provide flexible reactive power control, independent at each converter terminal. It is also useful when connecting DC sources to weak AC grids. Steady-state RMS analysis techniques are commonly used for early-stage analysis, for design purposes and for relaying. Sources interfaced through DC/AC or AC/DC/AC converters, opposite to conventional generators, are not well represented by electromotive forces (E) behind impedance models. A methodology to include voltage source converters (VSCs) in conventional RMS short-circuit analysis techniques is advanced in this work. It represents an iterative procedure inside general calculation techniques and can even be used by those with only basic power electronics knowledge. Results are compared to those of the commercial software package PSS®CAPE to demonstrate the validity of the proposed rmsVSC algorithm.

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Islam, Shekh Md Mahmudul, Mohammad Anisur Rahman Reza, and Md Adnan Kiber. "Performances of Multi-Frequency Voltage to Current Converters for Bioimpedance Spectroscopy." Bangladesh Journal of Medical Physics 5, no. 1 (April 19, 2013): 71–76. http://dx.doi.org/10.3329/bjmp.v5i1.14671.

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Breast cancer is one of the most common diseases affecting women and the mortality rate is very high in Bangladesh, mainly due to the lack of early diagnosis. X-ray mammography is not available widely in Bangladesh, besides it has an associated biological hazard. Multi-frequency bio-impedance measurement or bio-impedance spectroscopy has a great potential in many biomedical applications including breast cancer screening which involves tissue characterization. In Bio-impedance spectroscopy a range of frequencies of low level current is injected to the human body and corresponding bio-impedance is measured. In a typical bio-impedance measurement system an ac source with a constant current amplitude is an essential part in which the current amplitude should not change with frequency or load, the latter being typically of the order of a few kilo ohms in the human body. The constant current source is usually obtained from a voltage-to-current converter and several standard designs are available, for example a floating current source, a Howland current source and an enhanced Howland current source. The present work was taken up to perform a comparative study of these three types of current sources based on a commonly available low cost operational amplifier, 741. It was found that the enhanced Howland current source gave the best performance, the current being almost constant up to a frequency of about 10kHz for a load of 10k?. This work gives an understanding of this fundamental circuit segment that is essential for the development of a Bioimpedance Spectroscopy system. DOI: http://dx.doi.org/10.3329/bjmp.v5i1.14671 Bangladesh Journal of Medical Physics Vol.5 No.1 2012 71-76

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Yao, Qi, Dylan-Dah-Chuan Lu, and Gang Lei. "Accurate Online Battery Impedance Measurement Method with Low Output Voltage Ripples on Power Converters." Energies 14, no. 4 (February 18, 2021): 1064. http://dx.doi.org/10.3390/en14041064.

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The conventional online battery impedance measurement method works by perturbing the duty cycle of the DC-DC power converter and measuring the response of the battery voltage and current. This periodical duty cycle perturbation will continuously generate large voltage ripples at the output of power converters. These large ripples will not easily be removed due to the high amplitude and wide frequency range and would be a challenge to meet tight output regulation. To solve this problem, this paper presents a new online battery impedance measurement technique by inserting a small switched resistor circuit (SRC) into the converter. The first contribution of this work is that the perturbation source is moved from the main switch to the input-side of the converter, so the ripples are reduced. The analysis and experimental results of the proposed method show a reduction of 16-times compared with the conventional method. The second contribution tackles the possible change of the battery state of charge (SOC) during the online battery measurement process, which will inevitably influence the impedance measurement accuracy. In this proposed method, battery impedance at multiple frequencies can be measured simultaneously using only one perturbation to accelerate measurement speed and minimize possible SOC change. The experimental impedance results coincide with a high-accuracy laboratory battery impedance analyzer.

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Subhas Borkar, Shubham, and Guruswamy K P. "A REVIEW ON COMPARISON STUDY OF DIFFERENT CONVERTER WITH VARIOUS CONTROL TECHNIQUES AND VARIOUS MPPT TECHNIQUES." International Journal of Innovative Research in Advanced Engineering 9, no. 2 (February 27, 2022): 43–51. http://dx.doi.org/10.26562/ijirae.2022.v0902.02.

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There are various DC-DC converters used in Solar PV system for matching the impedance between the source and the load. This document describes the many types of converters used in photovoltaic solar systems, including their applications, advantages, and downsides. This article presents a study of the literature of the majority recent results in artificial intelligence algorithms for maximum power tracking control. MPPT algorithms are used to match the load resistance to the source input resistance to increase the power delivered from the PV system. This paper gives reviews of different control techniques for DC-DC Interleaved Boost Converter for power level conversion. Different control schemes, including linear and non-linear control. Moreover, various control techniques are compared in terms of Advantages and disadvantages of each.

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Merenda, Massimo, Demetrio Iero, Giovanni Pangallo, Paolo Falduto, Giovanna Adinolfi, Angelo Merola, Giorgio Graditi, and Francesco Della Corte. "Open-Source Hardware Platforms for Smart Converters with Cloud Connectivity." Electronics 8, no. 3 (March 26, 2019): 367. http://dx.doi.org/10.3390/electronics8030367.

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This paper presents the design and hardware implementation of open-source hardware dedicated to smart converter systems development. Smart converters are simple or interleaved converters. They are equipped with controllers that are able to online impedance match for the maximum power transfer. These conversion systems are particularly feasible for photovoltaic and all renewable energies systems working in continuous changing operating conditions. Smart converters represent promising solutions in recent energetic scenarios, in fact their application is deepening and widening. In this context, the availability of a hardware platform could represent a useful tool. The platform was conceived and released as an open hardware instrument for academy and industry to benefit from the improvements brought by the researchers’ community. The usage of a novel, open-source platform would allow many developers to design smart converters, focusing on algorithms instead of electronics, which could result in a better overall development ecosystem and rapid growth in the number of smart converter applications. The platform itself is proposed as a benchmark in the development and testing of different maximum power point tracking algorithms. The designed system is capable of accurate code implementations, allowing the testing of different current and voltage-controlled algorithms for different renewable energies systems. The circuit features a bi-directional radio frequency communication channel that enables real-time reading of measurements and parameters, and remote modification of both algorithm types and settings. The proposed system was developed and successfully tested in laboratory with a solar module simulator and with real photovoltaic generators. Experimental results indicate state-of-art performances as a converter, while enhanced smart features pave the way to system-level management, real-time diagnostics, and on-the-flight parameters change. Furthermore, the deployment feasibility allows different combinations and arrangements of several energy sources, converters (both single and multi-converters), and modulation strategies. To our knowledge, this project remains the only open-source hardware smart converter platform used for educational, research, and industrial purposes so far.

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Dhinesh, V., and G. Vijayakumar. "A switched quasi Z-source three-port (SqZSTP) DC-DC converter for a photovoltaic power generation system." Semiconductor Science and Technology 37, no. 4 (March 8, 2022): 045014. http://dx.doi.org/10.1088/1361-6641/ac419d.

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Abstract In this paper, a modified wide-input switched quasi Z-source three-port (SqZSTP) DC-DC converter is proposed to interface a photovoltaic inverter with a distributed power generation system. The proposed SqZSTP DC-DC converter constructed with a quasi Z-source impedance network and a three-winding high-frequency transformer offers high voltage gain over a wide input voltage range. In the proposed topology, the input port is divided into two ports, to reduce the power rating and voltage stress across each component. The design and operating principles of the SqZSTP DC-DC converter are presented. The steady state and dynamic performance of the proposed SqZSTP DC-DC converter are compared to other converters that have an impedance network in front. The fuzzy logic controller used in the voltage loop avoids variation in the output voltage when a wide variation in the input voltage happens. In order to test the proposed topology, a scaled-down model with a voltage and power rating of 400 V/1400 W was developed. AT conversion efficiency of 94.5% is achieved.

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Verma, Deepak, S. Nema, and A. M. Shandilya. "A Different Approach to Design Non-Isolated DC–DC Converters for Maximum Power Point Tracking in Solar Photovoltaic Systems." Journal of Circuits, Systems and Computers 25, no. 08 (May 17, 2016): 1630004. http://dx.doi.org/10.1142/s021812661630004x.

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Maximum power point tracking (MPPT) is an essential part of solar photovoltaic (PV) system to draw maximum available power which is generated by the solar PV. The concept of MPPT is based on maximum power transfer theorem. When the impedance of source is equal to the load impedance then only, source or solar PV delivers maximum power to the load. Impedance matching is done through DC–DC converter, whereas the duty cycle of the converter is decided by the MPPT algorithm. Nonetheless, DC–DC converter design is a key aspect in any tracking scheme, bulk of publications on MPPT are available in literature but very less information can be obtained on DC–DC converter design. Thus, the main focus of this paper is to provide an easy converter design procedure for MPPT in solar PV applications on the basis of solar panels impedance. In this paper, a step by step design of buck converter, boost converter and buck–boost converter particularly for MPPT applications is presented and results are verified through OPAL-RT OP4500 Real Time Simulator.

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Kumari, Remala Geshma, A. Ezhilarasi, and Naresh Pasula. "Control strategy for modified CI-based Bi-directional Γ-Z source DC-DC converter for buck-boost operation." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 3 (September 1, 2022): 1510. http://dx.doi.org/10.11591/ijpeds.v13.i3.pp1510-1518.

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This paper introduces a novel Bi-directional coupled-inductor (CI) based Γ-Z source converter for step up-step down DC application. It is a modified version of CI based Γ-Z high gain converter. The converter originates under the family of impedance networks with two winding coupled inductor. The said converter when operated with low duty ratio makes converter to achieve high gain compared to conventional DC-DC converters. As the society is in trend with electric vehicles (EV’s) are recommending operating the converters in Bi-directional mode to have continuous power flow when those are operated with green technologies. So, the same converter is initially operated and verified as buck and boost converter in open loop mode. Nearly 38 and 4 voltage-gainin boost and buck mode was observed when realized in MATLAB environment for the designed inductor and capacitor values with 49% and 1% duty cycle respectively under open-loop configuration. In the succeeding a PID controller based closed loop control strategy has implemented for the same converter. Gain sensitivity of the converter had been verified in MATLAB Simulink environment. Results obtained from simulation and mathematical found satisfactory in open and closed loop.

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Zhang, Shuaitao, Baihua Zhang, Qiang Lin, Eiji Takegami, Masahito Shoyama, and Gamal M. Dousoky. "Modeling and Optimization of Impedance Balancing Technique for Common Mode Noise Attenuation in DC-DC Boost Converters." Electronics 9, no. 3 (March 14, 2020): 480. http://dx.doi.org/10.3390/electronics9030480.

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As an effective means of suppressing electromagnetic interference (EMI) noise, the impedance balancing technique has been adopted in the literature. By suppressing the noise source, this technique can theoretically reduce the noise to zero. Nevertheless, its effect is limited in practice and also suffers from noise spikes. Therefore, this paper introduces an accurate frequency modeling method to investigate the attenuation degree of noise source and redesign the impedance selection accordingly in order to improve the noise reduction capability. Based on a conventional boost converter, the common mode (CM) noise model was built by identifying the noise source and propagation paths at first. Then the noise source model was extracted through capturing the switching voltage waveform in time domain and then calculating its Fourier series in frequency domain. After that, the conventional boost converter was modified with the known impedance balancing techniques. This balanced circuit was analyzed with the introduced modeling method, and the equivalent noise source was precisely estimated by combining the noise spectra and impedance information. Furthermore, two optimized schemes with redesigned impedances were proposed to deal with the resonance problem. A hardware circuit was designed and built to experimentally validate the proposed concepts. The experimental results demonstrate the feasibility and effectiveness of the proposed schemes.

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Esmaeili, Soroush, Kasra Ghobadi, Hassan Zare, Mohsin Jamil, Ashraf Ali Khan, and Amin Mahmoudi. "A Trans-Inverse Magnetic Coupling Single-Phase AC-AC Converter." Energies 15, no. 12 (June 13, 2022): 4319. http://dx.doi.org/10.3390/en15124319.

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This paper introduces a new single-phase AC-AC converter based on an impedance source circuit. Like the existing single-phase impedance source AC-AC converters, it has the buck-boost ability and direct ac conversion. The input and output voltage possesses the same ground, and the phase angle is maintained and reversed smoothly. The presented converter utilizes a coupled transformer which allows the designer to exploit the transformer’s turns ratio as a variable to attain the desired output voltage. Additionally, the used transformer provides an option to obtain higher voltage gain by decreasing the turns ratio. Hence, smaller size of the coupled inductors is required for the higher voltage cases. To eliminate the switching voltage and current spikes on the power switches, a safe commutation strategy is used instead of utilizing snubber circuits. Furthermore, the input current is continuous and sinusoidal with low harmonics thanks to embedding the input inductor in series with the input source. Additionally, a dynamic voltage restorer is presented based on the proposed converter to compensate the voltage sag and swell faults. Simulation results are provided to evaluate the theoretical analysis. Finally, a laboratory prototype has been fabricated to demonstrate the validation of the presented converter.

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Alves, André G. P., Luís G. B. Rolim, Robson F. S. Dias, and Paulo T. P. Santos. "Online Impedance Estimation for Voltage Source Converters through the Discrete Fourier Transform." Journal of Control, Automation and Electrical Systems 32, no. 5 (July 19, 2021): 1279–88. http://dx.doi.org/10.1007/s40313-021-00769-y.

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Forouzesh, Mojtaba, Yam P. Siwakoti, Frede Blaabjerg, and Sara Hasanpour. "Small-Signal Modeling and Comprehensive Analysis of Magnetically Coupled Impedance-Source Converters." IEEE Transactions on Power Electronics 31, no. 11 (November 2016): 7621–41. http://dx.doi.org/10.1109/tpel.2016.2553849.

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Lu, Dapeng, Xiongfei Wang, and Frede Blaabjerg. "Impedance-Based Analysis of DC-Link Voltage Dynamics in Voltage-Source Converters." IEEE Transactions on Power Electronics 34, no. 4 (April 2019): 3973–85. http://dx.doi.org/10.1109/tpel.2018.2856745.

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Fonseca, Thales Queiroz, Ricardo L. A. Ribeiro, Thiago de Oliveira Alves Rocha, Flavio Bezerra Costa, and Josep M. Guerrero. "Voltage Grid Supporting by Using Variable Structure Adaptive Virtual Impedance for LCL-Voltage Source Converter DG Converters." IEEE Transactions on Industrial Electronics 67, no. 11 (November 2020): 9326–36. http://dx.doi.org/10.1109/tie.2019.2952784.

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Zhang, Weiming, Hui Fan, Jiangbo Ren, Xianzhi Wang, Tiecheng Li, and Yibo Wang. "A Vector Inspection Technique for Active Distribution Networks Based on Improved Back-to-Back Converters." Sustainability 15, no. 1 (December 31, 2022): 750. http://dx.doi.org/10.3390/su15010750.

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In this paper, an improved back-to-back converter is proposed, and the converter is used as a test power source for vector inspection of relay protection in an active distribution network, which effectively solves the problem that the output voltage and current of the test power source cannot be continuously and stably adjusted. Firstly, a three-phase back-to-back cascade converter is established to analyze the impedance characteristics of its DC terminal. Then a feedforward voltage is added to the inverter to improve the input impedance characteristics of the inverter. Secondly, the system stability and parameter stability of the improved back-to-back converter are analyzed. Finally, the improved converter is used as the test power source for vector inspection of relay protection in the active distribution network. The simulation results show that the stability of the improved back-to-back converter system is greatly improved. The experiment shows that the vector check technology based on an improved back-to-back converter can effectively check the vector of relay protection in an active distribution network and find various installation problems.

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32

Liu, Hongchen, Fei Li, and Pat Wheeler. "A Family of DC–DC Converters Deduced From Impedance Source DC–DC Converters for High Step-Up Conversion." IEEE Transactions on Industrial Electronics 63, no. 11 (November 2016): 6856–66. http://dx.doi.org/10.1109/tie.2016.2582826.

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33

Babu, Yaramasu Suri, and Koritala Chandra Sekhar. "Five-phase induction motor drive for electric vehicle with high gain switched-inductor quasi impedance source inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (March 1, 2022): 411. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp411-422.

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Switched-inductor quasi-impedance source inverter (SL-qZSI) with high gain fed five-phase induction motor drive for electric vehicle (EV) applications is proposed in this paper. Multi-phase electric machines have been predicted for application where the entire system should have better reliability and demanded power per phase is low especially for autonomous applications like EVs. To supply variable voltage and frequency to multi-phase machines, multi-phase inverters are required. SL-qZSI offers enhanced boost capability with respect to traditional impedance source converters by inserting three diodes and only one inductor to the basic quasi-impedance source inverter (qZSI). Also, SL-qZSI offers withstanding capability during voltage dip results line harmonics are diminished; enhances reliability of inverter; and extended output voltage range. The key idea of this paper is to design and develop a high performance and highly reliable SL-qZSI fed five-phase Induction Motor drive and validate the proposed system depends on results of Simulation with the help of MATLAB; these findings were comparable to the similar type of existing converters. We can notice from the performance analysis of the proposed system that it can provide enhanced voltage boosting capability and proved that it has significant potential for the suggested multi-phase variable speed drive (VSD) system.

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Chub, Andrii, Dmitri Vinnikov, Oleksandr Korkh, Tanel Jalakas, and Galina Demidova. "Wide-Range Operation of High Step-Up DC-DC Converters with Multimode Rectifiers." Electronics 10, no. 8 (April 12, 2021): 914. http://dx.doi.org/10.3390/electronics10080914.

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This paper discusses the essence and application specifics of the multimode rectifiers in high step-up DC-DC converters. It presents an overview of existing multimode rectifiers. Their use enables operation in the wide input voltage range needed in highly demanding applications. Owing to the rectifier mode changes, the converter duty cycle can be restricted to a range with a favorable efficiency. It is shown that the performance of such converters depends on the front-end inverter type. The study considers current- and impedance-source front-end topologies, as they are the most relevant in high step-up applications. It is explained why the full- and half-bridge implementations provide essentially different performances. Unlike the half-bridge, the full-bridge implementation shows step changes in efficiency during the rectifier mode changes, which could compromise the long-term reliability of the converter. The theoretical predictions are corroborated by experimental examples to compare performance with different boost front-end inverters.

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Vinnikov, Dmitri, Indrek Roasto, Liisa Liivik, and Andrei Blinov. "Four Novel PWM Shoot-Through Control Methods for Impedance Source DC-DC Converters." Journal of Power Electronics 15, no. 2 (March 20, 2015): 299–308. http://dx.doi.org/10.6113/jpe.2015.15.2.299.

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Wu, Tianhao, Xiaorong Xie, Qirong Jiang, and Zhuoxuan Shen. "Impedance modelling of grid-connected voltage-source converters considering the saturation non-linearity." IET Generation, Transmission & Distribution 14, no. 21 (November 2, 2020): 4815–23. http://dx.doi.org/10.1049/iet-gtd.2020.0919.

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Zadehbagheri, Mahmoud, Tole Sutikno, and Rahim Ildarabadi. "Using Y-source network as a connector between turbine and network in the structure of variable speed wind turbine." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 3 (September 1, 2021): 1644. http://dx.doi.org/10.11591/ijpeds.v12.i3.pp1644-1658.

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Environmental factors such as air pollution and increase in global warming by using polluting fuels are the most important reasons of using renewable and clean energy that runs in global community. Wind energy is one of the most suitable and widely used kind of renewable energy which had been in consideration so well. This paper introduces an electric power generation<br />system of wind based on Y-source and improved Y-source inverter to deliver optimal electrical power to the network. This new converter is from impedance source converters family. This presented converter has more degrees of freedom to adjust voltage gain and modulation. Also, by limiting the range of simultaneous control (shooting through) while it maintains the<br />highest power of maximizer, it can operate in higher modulation range. This causes the reduce of stress in switching and thus it will improve the quality of output. Recommended system had been simulated in MATLAB/Simulink and shown results indicate accurate functionality.

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Liang, Haifeng, Yue Dong, Yuxi Huang, Can Zheng, and Peng Li. "Modeling of Multiple Master–Slave Control under Island Microgrid and Stability Analysis Based on Control Parameter Configuration." Energies 11, no. 9 (August 24, 2018): 2223. http://dx.doi.org/10.3390/en11092223.

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The stable operation of a microgrid is crucial to the integration of renewable energy sources. However, with the expansion of scale in electronic devices applied in the microgrid, the interaction between voltage source converters poses a great threat to system stability. In this paper, the model of a three-source microgrid with a multi master–slave control method in islanded mode is built first of all. Two sources out of three use droop control as the main control source, and another is a subordinate one with constant power control which is also known as real and reactive power (PQ) control. Then, the small signal decoupling control model and its stability discriminant equation are established combined with “virtual impedance”. To delve deeper into the interaction between converters, mutual influence of paralleled converters of two main control micro sources and their effect on system stability is explored from the perspective of control parameters. Finally, simulation and analysis are launched and the study serves as a reference for parameter setting of converters in a microgrid.

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Ma, Yanhong, Lijun Fu, Qi Hu, Guangyu Wang, and Chenruiyang Liu. "Transient Synchronizing Stability of Droop-Controlled Converter during Grid Fault Considering Current Saturation Limitation." Processes 10, no. 8 (August 11, 2022): 1578. http://dx.doi.org/10.3390/pr10081578.

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Traditional power systems usually rely on synchronous generators to provide inertia and maintain grid stability. However, with the continuous development of new energy power generation technologies, more and more converter power supplies provide voltage and frequency support for the power grid. The synchronizing instability issue of a converter-dominated power system becomes increasingly relevant, which exists in both grid-following (GFL) and grid-forming (GFM) converters. In this paper, the transient synchronizing stability of grid-forming (GFM) converters with droop-control during a grid fault is studied, with the influence of current saturation limitation considered especially. The current saturation limitation applied to limit overcurrent during grid faults brings transient voltage-source/current-source switched mode of the converter, which significantly influences the transient behavior. Considering the influence, an equivalent motion model similar to the rotor motion of a synchronous generator is developed first to depict the transient synchronizing dynamics. It has been identified that the current saturation limitation reconstructs the power angle characteristics, which significantly influence the transient stability. Then based on the developed model, transient synchronizing stability during a grid fault is studied based on the accelerating–decelerating area method. With the influence of grid impedance and grid voltage sag considered, several kinds of transient synchronizing stability issues are revealed clearly. Finally, simulated results are presented to verify the theoretical analysis. The analysis of this article paves the way for the follow-up research on the synchronizing stability of multi-converters and the corresponding control methods to improve synchronizing stability.

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Ying, Xiao, Heng Wei Lin, Zhao Yang Yan, Jian Xia Li, and Ming Su. "Voltage and Frequency Droop Control in an Autonomous Microgrid." Applied Mechanics and Materials 236-237 (November 2012): 568–75. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.568.

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In this paper, a method for the parallel operation of inverters in an autonomous microgrid system is adopted. This paper presents the resistive output impedance control scheme that allows multiple voltage source converters (VSCs) to operate in parallel in a VSC fed microgrid. The control loops are taking into account the special nature of a low-voltage microgrid, in which the line impedance is mainly resistive. In contrast with the conventional droop-control method, the proposed controller uses a virtual resistance without communication signals to achieve good power sharing, which is insensitive to line-impedance unbalances.

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Mande, Daouda, João Pedro Trovão, and Minh Cao Ta. "Comprehensive Review on Main Topologies of Impedance Source Inverter Used in Electric Vehicle Applications." World Electric Vehicle Journal 11, no. 2 (April 26, 2020): 37. http://dx.doi.org/10.3390/wevj11020037.

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Power electronics play a fundamental role for electric transportation, renewable energy conversion and many other industrial applications. They have the ability to help achieve high efficiency and performance in power systems. However, traditional inverters such as voltage source and current source inverters present some limitations. Consequently, many research efforts have been focused on developing new power electronics converters suitable for many applications. Compared with the conventional two-stage inverter, Z-source inverter (ZSI) is a single-stage converter with lower design cost and high efficiency. It is a power electronics circuit of which the function is to convert DC input voltage to a symmetrical AC output voltage of desired magnitude and frequency. Recently, ZSIs have been widely used as a replacement for conventional two-stage inverters in the distributed generation systems. Several modifications have been carried out on ZSI to improve its performance and efficiency. This paper reviews the-state-of-art impedance source inverter main topologies and points out their applications for multisource electric vehicles. A concise review of main existing topologies is presented. The basic structural differences, advantages and limitations of each topology are illustrated. From this state-of-the-art review of impedance source inverters, the embedded quasi-Z-source inverter presents one of the promising architectures which can be used in multisource electric vehicles, with better performance and reliability. The utilization of this new topology will open the door to several development axes, with great impact on electric vehicles (EVs).

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Fakhri, Naser, Mohammad Salay Naderi, Saeid Gholami Farkoush, Adel Khoshdel, Soroush Aghili, Seung Kil Choi, Seung-Ryle Oh, and Sang-Bong Rhee. "Optimization of Impedance-Source Galvanically Isolated DC–DC Converters With Reduced Number of Switches." IEEE Access 10 (2022): 3835–47. http://dx.doi.org/10.1109/access.2021.3139948.

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43

Liu, Jianing, Xin Tao, Miao Yu, Yanghong Xia, and Wei Wei. "Impedance Modeling and Analysis of Three-Phase Voltage-Source Converters Viewing From DC Side." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 4 (December 2020): 3906–16. http://dx.doi.org/10.1109/jestpe.2019.2932618.

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44

Wang, Yachao, Ahmed Darwish, Derrick Holliday, and Barry W. Williams. "Plug-In Repetitive Control Strategy for High-Order Wide-Output Range Impedance-Source Converters." IEEE Transactions on Power Electronics 32, no. 8 (August 2017): 6510–22. http://dx.doi.org/10.1109/tpel.2016.2615689.

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Hasan, Saad Ul, and Graham E. Town. "An Aperiodic Modulation Method to Mitigate Electromagnetic Interference in Impedance Source DC–DC Converters." IEEE Transactions on Power Electronics 33, no. 9 (September 2018): 7601–8. http://dx.doi.org/10.1109/tpel.2017.2772909.

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Shah, Shahil, and Leila Parsa. "Impedance Modeling of Three-Phase Voltage Source Converters in DQ, Sequence, and Phasor Domains." IEEE Transactions on Energy Conversion 32, no. 3 (September 2017): 1139–50. http://dx.doi.org/10.1109/tec.2017.2698202.

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Xu, Jianzhi, Xingjian Yang, Hui Zhao, Jian Qiu, and Kefu Liu. "An Inductor-Based and Capacitor-Free Bipolar Pulse Converter with Overvoltage Protection." World Electric Vehicle Journal 13, no. 5 (May 18, 2022): 91. http://dx.doi.org/10.3390/wevj13050091.

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The inductor-based and capacitor-free bipolar pulse converter can be applied to electric vehicle charging and realize an efficient and reliable charging-control strategy. Inductor-based converters can avoid the converter failure caused by the failure of energy storage capacitors and improve the reliability. An overvoltage protection scheme based on active clamping topology is used to protect this converter when the load impedance is too large. This overvoltage protection can take effect in an extremely short time (~50 ns) with little energy wasted. Furthermore, mathematical analyses of the proposed topology are presented and simulations based on LTspice are made, showing the feasibility and reliability of this circuit. Moreover, calculation of the power loss on MOSFETs is presented. A 201 W prototype converter with an efficiency of 83% is presented, and experimental results show that the converter can work reliably. This manuscript also proves the feasibility and application prospect of using this current-source-based converter for EV charging.

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Barrero-González, Fermín, Carlos Roncero-Clemente, María Isabel Milanés-Montero, Eva González-Romera, Enrique Romero-Cadaval, Oleksandr Husev, and V. Fernão Pires. "Improvements on the Carrier-Based Control Method for a Three-Level T-Type, Quasi-Impedance-Source Inverter." Electronics 8, no. 6 (June 14, 2019): 677. http://dx.doi.org/10.3390/electronics8060677.

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The boost feature that characterizes Z-source and quasi-Z-source converters is usually achieved by means of a proper insertion of short-circuit states in the full DC-link. In this work, a novel pulse width modulation carrier-based strategy for a three-phase, three-level T-type, quasi-Z-source inverter is introduced, based on the addition of alternate short-circuits in the two halves of the DC-link bus. This technique achieves better performance, less electromagnetic interference, and lower harmonic distortion of the output line-to-line voltage compared to the traditional methods based on the full DC-link shoot-through. At the same time, generating the switching states is to easy implement. The proposed strategy permits the use of electronic devices with lower blocking voltage capability, thus improving converter reliability, size, and cost. The new method may be implemented in another multilevel inverter with an impedance-source network as well. A comprehensive simulation study is performed in order to validate the adopted method, with different inverter input voltages, which is taken as representative of a photovoltaic array. Comparisons are conducted with conventional strategy insertions using the same topology in order to show the improvements achieved.

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Zhang, Han, Zhigang Liu, Siqi Wu, and Zhiyuan Li. "Input Impedance Modeling and Verification of Single-Phase Voltage Source Converters Based on Harmonic Linearization." IEEE Transactions on Power Electronics 34, no. 9 (September 2019): 8544–54. http://dx.doi.org/10.1109/tpel.2018.2883470.

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Xue, Danhong, Jinjun Liu, Zeng Liu, Yiming Tu, and Teng Liu. "Modeling and Analysis of DC Terminal Impedance of Voltage-Source Converters With Different Control Modes." IEEE Transactions on Power Electronics 35, no. 6 (June 2020): 5883–96. http://dx.doi.org/10.1109/tpel.2019.2953118.

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Journal articles on the topic 'Impedance-source converters'

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