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Open-circuit Fault-tolerant Control Strategy Based on Five-level power converter for SRM System

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CES Transactions on Electrical Machines and Systems 2019年第2期3卷 178-186页

作者： Mingyao Ma Kexiang Yuan Qingqing Yang Shuying Yang School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

Switched reluctance motor power converters are prone to open-circuit faults because it need to withstand large voltages and currents.Due to the small number of traditional asymmetrical half bridge topology switches,it is difficult to carry out fault tolerant control when power converters has an open-circuit fault,resulting in larger output torque ripple.This paper presents a five-level power converter based on the traditional asymmetric half-bridge power converter.The five-level topology has more switching states and can work in multi-level mode.Based on the topology,different excitation and demagnetization voltages can be choose at different speeds.A fault-tolerance strategy is developed to decrease the influence of the open-circuit fault.The five-level power converter has four switches per phase,and two of them will be used in one of the operating mode.So the remaining two of the switches can be used for safe backup,enabling fault-tolerant control when an open-circuit occur.Since each phase of the five-level power converter proposed in this paper is independent of each other,a reasonable control strategy can be used to avoid the unbalance of the midpoint potential.Finally,the topology and fault-tolerant strategy proposed in this paper are verified by simulation and experiment.

关键词： Fault tolerance control Midpoint potential Open-circuit fault power converter Torque ripple.

Application of non-isolated bidirectional DC-DC converters for renewable and sustainable energy systems:a review

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Clean Energy 2023年第2期7卷 293-311页

作者： Tole Sutikno Rizky Ajie Aprilianto Hendril Satrian Purnama Department of Electrical Engineering Universitas Ahmad DahlanYogyakartaIndonesia Embedded Systems and power Electronics Research Group YogyakartaIndonesia Department of Electrical and Information Engineering Universitas Gadjah MadaYogyakartaIndonesia

The primary challenge in renewable-energy utilization is an energy-storage system involving its power converter.The systems have to promise high efficiency,reliability and durability.Also,all of these can be realized at an economical cost.Buck and boost converters connected in parallel can convert power in both directions.It is the basic non-isolated bidirectional topology commonly used with energy-storage systems.The primary issue with the buck-boost non-isolated bidirectional converter is how to enhance its performance,so the modification involving this topology is still conducted.This paper examines 29 proposed converters from 30 research publications published in the last 10 years,the most recent of which focuses on modified non-isolated bidirectional converters based on the buck-boost topology.These are classified into eight modification schemes,which involve adding new components or circuits to the base topology.Each is evaluated against six parameters:the number of components,control complexity,power-rating applications,soft-switching ability,efficiency outcome and capacity to minimize losses.Moreover,each modified non-isolated bidirectional converter was compared from the renewable-energy-based power-generation-source perspective utilized.Based on these studies,researchers might think of ways to improve the buck-boost converter by changing it to make a new non-isolated bidirectional converter that can be used in systems that need it.

关键词： buck-boost converter bidirectional converter renewable energy energy-storage systems power converter

A Robust MPPT Control Based on Double Ended Forward converter Architecture

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Computers, Materials & Continua 2022年第1期70卷 135-150页

作者： M.Usman Khan K.M.Hasan A.Faisal Murtaza H.M.Usman Hadeed A.Sher University of Engineering&Technology Lahore54000Pakistan University of Central Punjab Lahore54000Pakistan Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Swabi23430Pakistan

In this paper,a stand-alone photovoltaic(PV)system based on a Double Ended Forward converter(DEFC)is presented.The proposed converter is specified for 48 V,100Wapplications as most of the equipment used in telecommunication and aircraft fall in this range.The literature has limited potential application of DEFCin PV systems.The research work deals with an in-depth study of DEFCand proposes an improvedDEFCfor PV applications with battery backup.Besides,a bi-directional dc-dc converter for the battery is integrated to track theMaximumpower Point(MPP)of the PV generator.The converter is examined under variable irradiance and load conditions,and the analytical analysis of boundary conditions are implemented.The converter’s architecture also ensures built-in I-V curve tracing for the identification of MPP of PV generator.It offers low voltage stresses across switches and avoids sinking power supply and core resetting circuits.The topology’s behavior is analyzed based onMPP achievement and maintaining output under different conditions of battery backup availability,environmental,and load conditions.The PV system architecture is designed and analyzed theoretically and verified with simulations on the PSIM software.

关键词： Photovoltaic power converter forward converter double ended forward converter bi-directional dc-dc converter MPP I-V curve tracing

A Review of Variable-inductor-based power converters for Eco-friendly Applications:Fundamentals,Configurations,and Applications

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Chinese Journal of Electrical Engineering 2023年第3期9卷 50-71页

作者： Zijie He Guidong Zhang Zexiang Chen Samson S.Yu School of Automation Guangdong University of TechnologyGuangzhou 510000China School of Engineering Deakin UniversityMelbourne 3000Australia

Modern eco-friendly industries such as renewable energy systems,electric vehicles(EVs),and light-emitting diodes(LEDs)have led to technological advancements in power electronics.Switching-based power converters have limited working ranges and can cause significant harmonics and oscillations in the output voltage and current.Introducing variable inductors can help solve this problem by changing the inductance without resorting to extreme switch duty cycles.Despite their advantages,there is still a lack of comprehensive reviews of variable inductor applications in power converter design.A thorough and in-depth review of variable inductance control in power conversion is presented,including its significance,working principle,core structure,modeling method,and typical applications.Traditionally,an inductor works in its linear magnetic region;its inductance in a power converter is considered constant,and the converter operates under fixed working conditions.However,a broad range of working conditions is required for power converters in practical applications.This is typically realized by changing the duty cycles of the switches.The working principle of variable inductance is reviewed,and the application of variable inductance control in power converters is presented,which will further help power electronics researchers and engineers design flexible and resilient power converters.

关键词： Variable inductors magnetic saturation magnetically controlled inductors power converter

Development and advances in modular multilevel converter based HVDC projects in China

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Frontiers of Engineering Management 2023年第1期10卷 183-189页

作者： Wang XIANG Peiyu MENG Jinyu WEN School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China

1 Introduction To achieve the goal of carbon neutrality,promoting renewable energy integration has become an urgent priority for the green energy transition.Due to the geographical distribution of renewable energy bases,bulk electrical power is transmitted to load centers through long-distance transmission lines.The line-commutated converter(LCC)based high voltage direct current(HVDC)technology,emerging in the 1970s,is the most mature solution.

关键词： high voltage direct current power converter power systems renewable energy ultra-high voltage

Analysis of complex intermittency in Boost converter from a bifurcation control viewpoint

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Science in China(Series F) 2008年第12期51卷 2135-2149页

作者： ZHOU YuFei JIANG XueDong CHEN JunNing School of Electronic Science and Technology Anhui University Hefei 230039 China

Due to undesirable interference via unintended coupling paths, switching converters may exhibit complex intermittency, which appears as a form of bifurcation undergoing regular operation, subharmonics, and chaos orderly and repeatedly for a long period of time. Such intermittent operation, being an unwanted operating state, should normally be avoided in power converters. This paper expounds the mechanism and conditions for the emergence of intermittency in a common current-mode controlled Boost converter. It is found that interference at frequencies near the switching frequency or its rational multiples may induce intermittent operation. The strengths and frequencies of the interfering signals determine the type and period of intermittency. The problem is analyzed by transforming the time-bifurcation analysis to a conventional parameter-bifurcation analysis. Based on this transformation, intermittency can be investigated from the bifurcation control viewpoint. Furthermore, the critical circuit parameter conditions for the emergence of intermittency can be predicted and compared with those from circuit simulation.

关键词： power converter intermittency bifurcation bifurcation control

A Novel Polymorphic Topology with Hybrid Control Strategy Based LLC Resonant converter for Ultra-Wide Input Voltage Range Applications

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Energy Engineering 2021年第2期118卷 341-361页

作者： Chi Zhang Yong Shi Xuwei Gui School of Electrical and Control Engineering Shaanxi University of Science and TechnologyXi’an710021China

To realize effective utilization of renewable energy sources,a novel polymorphic topology with hybrid control strategy based LLC resonant converter was analyzed and designed in this paper.By combining the merits of a full bridge LLC resonant converter,three-level half bridge LLC resonant converter,and variable frequency control mode,the converter realizes an intelligent estimation of input voltage by automatically changing its internal cir-cuit topology.Under this control strategy,different input voltages determine different operation modes.This is achieved in full bridge LLC mode when the input voltage is low.If the input voltage rises to a certain level,it operates in three-level half bridge LLC mode.These switches are digital and entirely carried out by the DSP(Digi-tal Signal Processor),which means that an auxiliary circuit is unnecessary,where a simple strategy of software modification can be utilized.Experimental results of a 500W prototype with 100V~600V input voltage and full load efficiency of up to 92%are developed to verify feasibility and practicability.This type of converter is suitable for applications with an ultra-wide input voltage range,such as wind turbines,photovoltaic generators,bioenergy,and other renewable energy sources.

关键词： Renewable energy sources power converter ultra-wide input voltage range multi-levels operation mode hybrid control strategy soft switching

Asian international grid connection and potentiality of DC superconducting power transmission

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Global Energy Interconnection 2018年第1期1卷 11-19页

作者： Satarou Yamaguchi Takashi Iitsuka Masashi Osada Ryuichi Yokoyama Chubu University Matsumoto-cho 1200Kasugai487-8500AichiJapan JGC Corporation Minato Mirai 2-3-1Nishi-kuYokohama 220-6001Japan ABB K.K. Ohsaki 2-1-1Shinagawa-ku141-6022 TokyoJapan Energy and Environment Technology Research Institute 1-22-2 Nishiwaseda Shinjuku169-0051 TokyoJapan

In 2011, a large scale earthquake and tsunami hit the northeastern coast of Japan, and nuclear plants were damaged to a large extent. Before the Tsunami, 54 nuclear plants were operated, however presently, only three nuclear plants are in operation. Therefore, Japan is suffering from high price of electricity and low supply reliability. In generation mix, nuclear plants generate only one percent and 87 percent of electricity is generated by fossil energy. This is not preferable for Japan from the viewpoints of energy security and stable electricity supply. Therefore, it is mandatory to increase sustainable energy and to decrease consumption of fossil fuel. International grid connection and the Global Energy Interconnection will be one of countermeasures against these problems existing in Japan. In this paper, international grid connection initiatives proposed in Asia are described and features and issues of electric power grids in Japan are discussed to implement the international grid connection. As the key technology for implementing the international grid connection, the present status of DC superconducting power transmission lines and power converters for long-distance power transmission lines are presented. In conclusion, conditions and legal frameworks for realizing the international grid connection are described.

关键词： International grid connection Global Energy Interconnection Sustainable energy DC superconducting power converter

Finite Control Set Model Predictive Control with Feedback Correction for power converters

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CES Transactions on Electrical Machines and Systems 2018年第3期2卷 312-319页

作者： Kun Shen Jianghua Feng Jing Zhang College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Technology Center of Zhuzhou CRRC Times Electric Co. Ltd.Zhuzhou 412001China

As an open-loop model predictive control algorithm,finite control set model predictive control(FCS-MPC)scheme in power converter system is based on assumption that responses of optimal control implemented on prediction model agree well with actual system.The influence of model parameter mismatches and environment disturbance on control performance of scheme is neglected.Then,based on feedback correction strategy in traditional model predictive control algorithm,we derive a finite control set model predictive control with feedback correction scheme(FCS-MPCFC)that allows us to adjust prediction model output at current instant by model prediction error at previous instant,and the closed-loop correction of prediction model output is achieved.Simulations comparison analyses on a two-level three-phase inverter with multi-type model parameter mismatches controlled by traditional and improved FCS-MPC scheme are presented.Experiments are carried out on DSP controller platform.

关键词： FCS-MPC feedback correction parameter mismatches power converter robustness