IET Power Electronics最新文献

{"title":"An Expandable Buck-Boost AC–AC Converter With Few Components, Wide Step-Down Conversion Ratio, Continuous Input Current and Common-Ground","authors":"Iman Abdoli,&nbsp;Alireza Lahooti Eshkevari,&nbsp;Hafiz Furqan Ahmed,&nbsp;Mohammad Arasteh","doi":"10.1049/pel2.70019","DOIUrl":"https://doi.org/10.1049/pel2.70019","url":null,"abstract":"<p>This paper proposes a new non-isolated single-phase buck-boost AC–AC converter with a reduced number of active and passive components and an improved buck-boost conversion ratio. The extension of the proposed circuit is also presented, which can generate a symmetric-bipolar buck-boost voltage. The converter achieves a wide step-down operating area due to the appropriate use of a coupled inductor, where small duty ratios are needed to obtain low step-down conversion ratios. This not only improves the efficiency but is also ideal for mitigating deep voltage sag/swell in applications such as a dynamic voltage restorer (DVR). Two out of four power switches used operate at high frequency in each input voltage half-cycle, while the other switches ensure safe commutation, which significantly reduces the switching losses compared to similar circuits. In addition, the topology has better total switch voltage stress (TSV) and switching device power (SDP) indexes than its competitors. The total volume of magnetic elements has also been improved. The converter ensures input current continuity using an input inductor and eliminates the need for additional harmonic filters. Due to its common-ground feature, a bulky line-frequency transformer can be eliminated when used in series with loads in applications such as a DVR. This article explains the operating principle of the proposed topology and evaluates its performance using a hardware prototype. Results verify the converter's operation and its superior features.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Amplitude and Frequency Characteristics of Magnetic Flux in Three-Dimensional Wound Core Transformer","authors":"Z. H. Su,&nbsp;L. F. Luo,&nbsp;D. Z. Chen","doi":"10.1049/pel2.70021","DOIUrl":"https://doi.org/10.1049/pel2.70021","url":null,"abstract":"<p>In order to deeply study the mathematical model and amplitude-frequency characteristics of the split-frame flux and composite flux of a three-dimensional wound core transformer. Firstly, based on the phasor relationship between the composite flux and the split-frame flux, this paper obtains the constraint equation between the composite flux and the split-frame flux. Based on Ohm's law for magnetic circuits, the constraint equation between the three-phase frame fluxes are derived, and the analytical solution of each split-frame flux is obtained by solving it. Secondly, combined with the characteristics that the flux distribution in the magnetic circuit always realizes the minimum magnetic resistance, starting from the relationship between the harmonic content, initial phase angle and the amplitude of the composite flux in the analytical solution of the split-frame flux, a calculation method for the harmonic content of the split-frame flux and the amplitude of the composite flux of a three-dimensional wound core transformer based on the multivariate function method is proposed. The harmonic content of the split-frame flux and the amplitude of the composite flux under excitation of an infinite power system and a small power system is clarified, and its typical applications are discussed. Finally, a test platform for a three-dimensional wound core transformer capable of realizing the presence or absence of zero-sequence flux components in each frame flux is built and relevant tests are carried out to verify the correctness of the proposed method.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Research of a New Bidirectional Extended Gain DC–DC Topology with Modularity and Continuous Current","authors":"Mohamad Reza Banaei,&nbsp;Mohamad Golmohamadi,&nbsp;Hadi Afsharirad","doi":"10.1049/pel2.70017","DOIUrl":"https://doi.org/10.1049/pel2.70017","url":null,"abstract":"<p>A new high-gain modular bidirectional DC-DC converter (BDC) is proposed in this paper, designed to facilitate energy transfer between the high- and low-voltage sides of a DC microgrid. In these applications, the low-voltage side typically consists of an energy storage system, such as lithium-ion battery structures. A step-up DC-DC converter is used to connect other sources, such as photovoltaic panels (PVs) or fuel cells, to the grid, delivering a DC voltage of approximately 300 to 500 volts on the high-voltage side. The proposed converter achieves a high voltage gain by operating in boost mode, utilising an extended quadratic boost ratio. Additionally, in buck mode, the converter can function either as a standard buck converter or as a quadratic buck converter. Furthermore, the low-voltage side of the converter features an inductor, which ensures continuous input current, eliminating the need for additional filters. Furthermore, the converter can be extended by the modular features, and the output voltage gain can be greatly increased. It should be noted that only one power switch is used for the voltage boost state, and the extra modules just include the passive elements. For this converter, the mathematical analysis has been accomplished, and the MATLAB Simulink and experimental results have been considered for a 200-W prototype of the proposed converter to prove its operability.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficiency of AC–DC Drivers in LED Lighting Systems Under Different Transistor Control Methods in a Forward Half-bridge Converter","authors":"Vasyl Kornaga,&nbsp;Demyd Pekur,&nbsp;Yurii Kolomzarov,&nbsp;Margarita Minyaylo,&nbsp;Viktor Sorokin","doi":"10.1049/pel2.70018","DOIUrl":"https://doi.org/10.1049/pel2.70018","url":null,"abstract":"<p>The development of reliable and energy-efficient drivers for LED lighting systems remains a critical task, as existing circuit designs often require the use of specialised integrated circuit. This work focuses on the development of high-efficiency drivers for LED lighting systems, addressing the need for stable performance and compliance with modern electromagnetic compatibility standards. The proposed drivers are based on a half-bridge converter topology with a maximum output power of approximately 200 W, which was chosen based on the typical power requirements of high-power LED lighting systems used in industrial, commercial and street lighting applications. Three different control circuit configurations were implemented: one using the IR2110 driver chip, another employing a single-signal transformer and a novel design incorporating two signal transformers. The innovative two signal transformer approach effectively reduced switching transients in the control signals while maintaining efficiency comparable to the IR2110-based solution. Experimental validation confirmed stable driver performance across varying input voltages without efficiency degradation. The driver achieved a minimum efficiency of 86.1%–88.5% within an output power range of 103–202 W, with nonlinear current distortion remaining below 6%. These results demonstrate the feasibility of the proposed driver solutions for energy-efficient LED lighting applications.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Universal Design Method of Load-Independent Constant Voltage and Constant Current Outputs for Capacitive Power Transfer System","authors":"Gang Yang,&nbsp;Pan Sun,&nbsp;Enguo Rong,&nbsp;Xiaochen Zhang,&nbsp;Xusheng Wu,&nbsp;Qijun Deng","doi":"10.1049/pel2.70016","DOIUrl":"https://doi.org/10.1049/pel2.70016","url":null,"abstract":"<p>In the field of wireless power transfer technology, capacitive power transfer (CPT) technology has received more and more attention due to its numerous advantages. Drones that are using lithium batteries as a power source require CPT systems to provide constant voltage (CV) and constant current (CC) outputs. This article proposes a universal design method of load-independent CV and CC outputs for CPT systems, making the design of CV and CC outputs more convenient and efficient, simplifying the process of configuring compensation network, optimizing the calculation of compensation elements parameters, and designing a system with high transmission efficiency in both CV and CC modes. Design and analysis methods of CV and CC outputs for CPT systems with arbitrary higher-order compensation networks are established based on fundamental compensation units. Besides, an optimized calculation method for parameters of compensation elements is given. An LCLC-LC compensated and an LCL-LCLC compensated CPT system are used as examples to describe the design and analysis process. An LCLC-LC compensated CPT prototype is built to verify the effectiveness and feasibility of the proposed method. The efficiencies of 88.43% at the CV frequency of 433 kHz and 82.59% at the CC frequency of 469 kHz have been achieved.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible on-load voltage regulating transformer based on common-capacity-midpoint two-half-bridge converter","authors":"Longfei Sun,&nbsp;Jingyuan Yin,&nbsp;Liu Shui,&nbsp;Libo Han,&nbsp;Jinke Li,&nbsp;Tongzhen Wei","doi":"10.1049/pel2.70005","DOIUrl":"https://doi.org/10.1049/pel2.70005","url":null,"abstract":"<p>Traditional on-load voltage regulating transformer are composed of segmented windings controlled by tap changers and power frequency transformers. The tap changer can only perform ‘step-wise voltage regulation’ and is slow in response. A topology of flexible on-load voltage regulating transformer is presented in this paper, which only requires connecting a power electronic converter at the tap changer of the on-load voltage regulating transformer. PEC can fully combine the existing on-load tap changer to achieve continuous stepless voltage regulation function. This paper conducts modelling of the switch cycle average and analyses the voltage regulation range for the proposed topology. It also performs stability analysis of the small signal model for the introduced converter. A multilayer integrated control strategy is proposed based on the degree of voltage fluctuation in the power grid and the current state of the on-load tap changer. In addition, in the closed-loop control strategy of the converter, the quasi proportional-resonance controller is introduced to improve the tracking performance of AC signal, and the voltage balance control is introduced to reduce the capacitor voltage difference on the DC side of the converter. Finally, simulation and experimental validation confirm the rationality and effectiveness of the proposed topology.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reliability of Power Modules in Corrosive Environments: Effect of Heating on Dendritic Corrosion Growth in the Isolation Trenches","authors":"Juuso Rautio,&nbsp;Tommi J. Kärkkäinen,&nbsp;Janne Jäppinen,&nbsp;Katriina Korpinen,&nbsp;Markku Niemelä,&nbsp;Pertti Silventoinen,&nbsp;Joonas A. R. Leppänen,&nbsp;Jonny M. Ingman","doi":"10.1049/pel2.70015","DOIUrl":"https://doi.org/10.1049/pel2.70015","url":null,"abstract":"<p>Environments with high humidity and corrosive gases have been shown to cause dendritic corrosion growth in isolation trenches of power semiconductor modules. In time, the corrosion products can grow long enough to bridge the isolation trenches and cause failure of the component, and the device the component is part of. In this paper, applied heating was shown to effectively inhibit dendritic corrosion growth by reducing the effective relative humidity and thereby the thickness of the adsorbed water layer on the ceramic substrate surface. The findings can be applied to enhance the reliability of power electronic devices e.g. frequency converters, including those with standard components without special corrosion-resistant packaging.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Switching Dynamic and EMI Characterization of a 1.2 kV/100 A All-SiC Module With the Easy-2B Package","authors":"Yikang Xiao,&nbsp;Shiqi Ji,&nbsp;Zhengming Zhao,&nbsp;Bochen Shi,&nbsp;Wenhao Xie,&nbsp;Mingyu Yang,&nbsp;Chao Sheng,&nbsp;Weitao Yang","doi":"10.1049/pel2.70011","DOIUrl":"https://doi.org/10.1049/pel2.70011","url":null,"abstract":"<p>Switching transient processes of silicon carbide (SiC) devices induce several challenges, such as voltage and current overshoots, switching losses, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>d</mi>\u0000 <mi>v</mi>\u0000 <mo>/</mo>\u0000 <mi>d</mi>\u0000 <mi>t</mi>\u0000 </mrow>\u0000 <annotation>$dv/dt$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>d</mi>\u0000 <mi>i</mi>\u0000 <mo>/</mo>\u0000 <mi>d</mi>\u0000 <mi>t</mi>\u0000 </mrow>\u0000 <annotation>$di/dt$</annotation>\u0000 </semantics></math>, and electromagnetic interference (EMI), threatening the safe and efficient operation of power electronic systems. Characterization of SiC modules is crucial to address these issues. This paper characterizes the dynamic and EMI performance of a state-of-the-art <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>1.2</mn>\u0000 <mspace></mspace>\u0000 <mtext>kV</mtext>\u0000 <mo>/</mo>\u0000 <mn>100</mn>\u0000 <mspace></mspace>\u0000 <mi>A</mi>\u0000 </mrow>\u0000 <annotation>$1.2 text{ kV} / 100 text{ A}$</annotation>\u0000 </semantics></math> all-SiC module with the Easy-2B package from Fuji Electric. Using a double pulse test (DPT) platform, the dynamic characteristics are assessed across varying load conditions and gate resistances. Additionally, EMI characteristics of the module are evaluated in a semi-anechoic chamber. Results indicate significant impacts of gate drive parameters and load conditions on switching dynamic and EMI characteristics. These influences are further analyzed based on experimental results and theoretical analysis of the switching transient processes. Finally, the study identifies factors limiting switching speed improvements in SiC modules, including voltage and current overshoots, gate voltage oscillations, and EMI, offering valuable insights for improving device performance.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and control of isolated current-fed DC–DC converters for fuel cell stacks EIS incorporating wide-frequency-range of perturbations","authors":"Jiabin Shen,&nbsp;Jiacheng Wang","doi":"10.1049/pel2.12836","DOIUrl":"https://doi.org/10.1049/pel2.12836","url":null,"abstract":"<p>Electrochemical impedance spectroscopy (EIS) performed by power converters makes in situ diagnostics possible for fuel cell stacks (FCS) in end applications without displacing and dismantling the stack. Previously published solutions, however, fall short of adequately generating a wide frequency range of perturbations covering all internal information of an FCS. The practical challenges and limitations of achieving converter generated perturbations at various frequencies are revealed in this paper. The high-end frequencies are constrained by the converter control bandwidth, whereas the low-end ones may cause significant ripples on the converter output. To address these issues, this paper proposes the use of isolated current-fed DC–DC converters for the design of an FCS power converter considering the output characteristics of the FCS operating at desired conditions and incorporating wide-frequency-range of EIS perturbations. Moreover, the oscillations resulting from EIS operations are tackled by properly guiding them from the load side to a primary side energy storage. A fuel-cell-dedicated power conditioning converter capable of presenting a wide-range frequencies of EIS perturbations is thus achieved. A design case is presented, and its simulation and experimental results verify the effectiveness of the proposed solution.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12836","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric vehicle charging demand forecasting at charging stations under climate influence for electricity dispatching","authors":"Peilu Chen,&nbsp;Jianzhong Qin,&nbsp;Jinxi Dong,&nbsp;Long Ling,&nbsp;Xiaoming Lin,&nbsp;Huixian Ding","doi":"10.1049/pel2.12833","DOIUrl":"https://doi.org/10.1049/pel2.12833","url":null,"abstract":"<p>As the prevalence of electric vehicles (EVs) continues to surge, the precise forecasting of charging demands at individual charging stations becomes imperative for effective power distribution management. However, the charging demand of EVs is often related to various factors and exhibits strong randomness. This paper aims to explore the impact of climatic factors on the charging demand of electric vehicles at charging stations, and to study a prediction model based on the attention mechanism of LSTM for predicting the load of charging stations, providing important guidance for the scheduling of electric vehicles. By analysing the load data of a single charging station under different climatic conditions, the paper finds that climatic factors such as the highest temperature of the day, the lowest temperature, and the type of weather significantly affect the charging demand of electric vehicles. Utilizing the aforementioned characteristics, this paper studies a climate feature-guided charging demand prediction model for a single charging station, which adopts the LSTM architecture and introduces the attention mechanism, incorporating the above-mentioned important climatic features, and is ultimately able to accurately predict the future charging demand of the charging station. The experimental results show that, compared to other time series forecasting models, this model has significantly improved performance on the dataset tests, with its accuracy ratio (AR) indicator and qualified rate indicator both exceeding 0.85 and 0.95, respectively. This study not only offers a new perspective and method for predicting the demand for electric vehicle charging but also provides support for the development of electric vehicle scheduling.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12833","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}