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LC-Z-Source Inverter Design and Control

Chinese Journal of Electronics 2020年第3期29卷 580-585页

作者： Asghar Taheri Jamal Abbasi Bolaghi Mohammad Hossein Babaei Department of Electrical Engineering University of Zanjan

The paper presents a new Z-source inverter with a low-stress reduction in the voltage of capacitors compared to the traditional Z-source inverter with the same boost factor. The proposed structure reduces costs and weight by reducing voltage *** main difference between this inverter and the traditional Z-source inverter lies in the arrangement of the components. In addition, the superiority of the proposed inverter over the L-Z-source inverter is related to the use of two capacitors instead of two diodes, which increases the boost power factor and obviates the need for the snubber circuit. Furthermore, another advantage of the proposed inverter can be extended to n cases in cascade form and the proposed inverter is continues current. The analysis,derivation of boost factor, capacitor voltages, voltages gain,and switch stress of the proposed inverter topology are carried out and are compared with the similar *** advantages of the proposed structure are verified by simulation and implementation.

关键词： Z-source inverter Voltage stress Boost factor modulation index

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Four-Dimensional Signal Constellations Based on Binary Frequency-Shift Keying and <i>M</i>-ary Amplitude-Phase-Shift Keying

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Journal of Computer and Communications 2020年第12期8卷 170-180页

作者： Nodar Ugrelidze Sergo Shavgulidze Juergen Freudenberger School of Technology Caucasus University Tbilisi Georgia Faculty of Power Engineering and Telecommunications Georgian Technical University Tbilisi Georgia Institute for System Dynamics HTWG Konstanz University of Applied Sciences Konstanz Germany

In this article, we give the construction of new four-dimensional signal constellations in the Euclidean space, which represent a certain combination of binary frequency-shift keying (BFSK) and M-ary amplitude-phase-shift keying (MAPSK). Description of such signals and the formulas for calculating the minimum squared Euclidean distance are presented. We have developed an analytic building method for even and odd values of M. Hence, no computer search and no heuristic methods are required. The new optimized BFSK-MAPSK (M = 5,6,···,16) signal constructions are built for the values of modulation indexes h =0.1,0.15,···,0.5 and their parameters are given. The results of computer simulations are also provided. Based on the obtained results we can conclude, that BFSK-MAPSK systems outperform similar four-dimensional systems both in terms of minimum squared Euclidean distance and simulated symbol error rate.

关键词： Signal Constellation Minimum Squared Euclidean Distance modulation index Signal Phase Simulation Symbol Error Rate

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Study and Design of a DC/AC Energy Converter for PV System Connected to the Grid Using Harmonic Selected Eliminated (HSE) Approach

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Open Journal of Applied Sciences 2022年第3期12卷 301-316页

作者： Dominique Bonkoungou Éric Korsaga Toussaint Guingané Sosthène Tassembédo Zacharie Koalaga François Zougmoré Laboratory of Materials and Environment (LA.M.E) University of Joseph KI-Zerbo Ouagadougou Burkina Faso University of Thomas Sankara (UTS) Ouagadougou Burkina Faso

Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great demand for AC applications. The supply of electrical machines and transfer energy to the distribution network is a typical case. In this work, we study and design a DC/AC energy converter using harmonic selective eliminated (HSE) method. To this end, we have combined two power stages connected in derivation. Each power stage is constituted of transistors and transformers. The connection by switching of the two rectangular waves, delivered by each of the stages, makes it possible to create a quasi-sinusoidal output voltage of the inverter. Mathematical equations based on the current-voltage characteristics of the inverter have been developed. The simulation model was validated using experimental data from a 25.2 kWp grid-coupled (PV) system, connected to Gridfit type inverters. The data were exported and implemented in programming software. A good agreement was observed and this shows all the robustness and the technical performances of the energy converter device. It emerges from this analysis that the inverter output voltage and the phase angle thus simulated are very important to control in order to orientate the transfer of the power flow from the continuous cell to cell to the alternating part. Simulated and field-testing results also show that increases in the value of the modulation factor (m) for low power output are highly significant. This study is an important tool for DC/AC inverter designers during initial planning stages. A short presentation of the design model of the inverter has been proposed in this article.

关键词： Inverter modulation index Transistors Power Stage Harmonic Selective Eliminated Photovoltaic (PV) System

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A NEW ALGORITHM FOR MAIN CARRIER ACQUISITION IN DEEP SPACE COMMUNICATIONS

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Journal of Electronics(China) 2011年第2期28卷 169-173页

作者： Zhang Ruyuan Zhan Yafeng Lu Jianhua Department of Electronic Engineering Tsinghua University Beijing 100084 China Space Center Tsinghua University Beijing 100084 China

Compared with common near space satellite Telemetry,Telecommand,and Communication(TT&C),deep space TT&C presents a more challenging environment such as long distance,very low Signal to Noise Ratio(SNR).How to acquire main carrier exactly becomes a hot focus for deep space *** there emerged some main carrier acquisition algorithms,but they all require high SNR and small modulation *** this paper,we develop a new acquire *** we use the spectral energy center algorithm to shorten the original sequence,filter out some noise and make the spectral more *** we adopt the spectral symmetry algorithm to make full use of the whole spectrum information,and utilize FFT to reduce computation *** results show that our algorithm can acquire main carrier successfully under large modulation index and get good performance with low Carrier to Noise Ratio(CNR).

关键词： Deep space Telemetry Telecommand and Communication(TT&C) Main carrier acqui-sition Low Carrier to Noise Ratio(CNR) modulation index

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Modeling and Analysis of Penalty on Optical Signal Performance Duo to Low-Frequency Subcarriers Multiplexing

Modeling and Analysis of Penalty on Optical Signal Performan...

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Asia-pacific Optical Communications 2004

作者： Yan Wang? Kang Li Fanmin Kong School of Information Science and Engineering Shandong University Jinan 250100 P.R.China

Using a conventional optical receiver model, we analyzed the penalties on the optical signal performance due to low- frequency subcarriers with a new approach, regarding the subcarrier as a sinusoidal

关键词： Subcarrier multiplexing Q factor modulation index Optical signal-to-noise ratio (OSNR) Bit error rate (BER)

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Radar Reflected Signal Process of High Spinning Rate Projectiles

Radar Reflected Signal Process of High Spinning Rate Project...

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2007 8th International Conference on Electronic Measurement & Instruments（ICEMI’2007）

作者： Zhang Ruoyu Wang Yuanqin Wutao Geng Wendong Academy of Equipment Command & Technology Beijing 101416 China

By slotting at the bottom of the projectiles, the target characteristics such as the spinning rate and the attitude can be obtained by Doppler radar. The reflection of spin projectile is a nonstationary AM-FM signal. The index of AM represents the attitude of the projectile. And the modulation frequency shows the spinning rate. The model of the reflected waveform is given. Chirp-Z transform （CZT） is adopted to improve the measurement precision. The process approach and the complexity of CZT are present. Its time cost is in the same grade to FFT. Simulation results and perspective are also given.

关键词： AM CZT Projectile Spin modulation index

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