IET Power Electronics最新文献

{"title":"Establishment and Analysis of Radiation Interference Prediction Model for Permanent Magnet Servo Drive System","authors":"Jingxuan He,&nbsp;Lijuan Zhang,&nbsp;Feifei Bu,&nbsp;Yajun Zhao,&nbsp;Shiliang Miao,&nbsp;Jiangong Yang,&nbsp;Haihong Qin,&nbsp;Panru Yang","doi":"10.1049/pel2.70174","DOIUrl":"https://doi.org/10.1049/pel2.70174","url":null,"abstract":"<p>High-frequency switching operations of power switching tubes generate high-frequency voltage and current pulse signals, resulting in substantial electromagnetic interference. As servo drive systems continue to evolve toward higher power density, integration and miniaturization, their internal electromagnetic environment grows increasingly complex, further intensifying interference levels and imposing higher demands on system electromagnetic compatibility (EMC) design. To address this challenge, this paper proposes a modelling method based on multi-software co-simulation to precisely model radiated interference in permanent magnet servo drive systems. Through an in-depth analysis of interference sources and their main propagation paths within the servo drive system, high-frequency impedance models were established for key components including cables, bus capacitance, MOSFETs and permanent magnet motors. Combined with a field-circuit-control co-simulation strategy, this approach enables prediction of radiated interference. To validate the reliability of the model, a measurement scheme under typical operating conditions was designed. Radiated interference data from the actual system was obtained and compared with simulation results. The findings demonstrate that the established model is highly accurate and provides a reliable pre-evaluation tool for subsequent system-level EMC design and optimization.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146130140","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":"A Novel Deep Transfer Learning-based Adaptive Cascade PI Controller Enhanced by Reinforcement Learning Algorithm and Snake Optimization for Robust Speed Regulation of Brushless DC Motors","authors":"SeyyedMorteza Ghamari,&nbsp;Asma Aziz","doi":"10.1049/pel2.70157","DOIUrl":"https://doi.org/10.1049/pel2.70157","url":null,"abstract":"<p>Brushless DC (BLDC) are common in electric cars, industrial automation, and robotics because of their high efficiency, high torque control, and compact size. Nevertheless, strong speed and current regulation is not easily attained because of system variation, load variations and the shortcomings of traditional fixed-gain proportional-integral (PI) controllers. In this paper, a new snake optimization-assisted deep transfer learning-based reinforcement learning (SOA-DTL-RL)-based adaptive cascade PI controller is proposed that combines transfer learning with fast adaptation, Reinforcement learning with real-time optimization, and snake optimization with optimal initial gain selection to guarantee the robust speed and current regulation in BLDC motors. The proposed approach combines transfer learning (TL) to use already trained control knowledge, but the reinforcement learning (RL) is used to dynamically optimize PI parameters to real-time system changes. The use of TL with RL allows the controller to have both the advantage of adapting quickly to new information by using previous knowledge and the advantage of learning in real-time to ensure there is no need to retrain a lot of the controller and makes it more robust in changing environments. One of the most important drawbacks of TL-based controllers is that they rely on clear initial gains and therefore may converge slowly or be unstable. To resolve this, snake optimization algorithm (SOA) is used to set the PI gains optimally in advance, so as to have a well-optimized initial point of real-time adaptation. Moreover, use of a deep neural network (DNN) in the TL-RL model improves generalization, enabling the controller to effectively learn complicated state-action relationships. The proposed cascade SOA-DTL-RL controller will guarantee the fast transient response, enhanced disturbance rejection, and high tracking accuracy under different operating conditions. The efficacy of the framework is proven by hardware-in-the-loop (HIL) real-time testing on the Typhoon HIL 606 platform, which showed great improvements in performance with respect to response time, robustness, and energy efficiency when compared to traditional PI controllers. An HIL experimental setup is used to validate that the proposed controller can be applied in real-time with minimal computational overhead, with robust speed and current regulation of BLDC motors in industrial and automotive applications.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70157","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146136784","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":"A Parameter Design Method for SVC Considering the Impedance Interaction Between Inverters and Reactive Compensation Devices","authors":"Chengjia Bao,&nbsp;Xingye Wang,&nbsp;Yonggang Li,&nbsp;Tianyi Zhang,&nbsp;Jianwen Li","doi":"10.1049/pel2.70191","DOIUrl":"https://doi.org/10.1049/pel2.70191","url":null,"abstract":"<p>Distributed generation (DG) aggregation points are typically equipped with reactive compensation devices to maintain voltage stability. However, improper parameter design may cause harmonic oscillations due to interactions between the device and inverter impedance. This paper investigates the impedance interaction between the inverter and reactive power compensation device, with the goal of enhancing system damping. A parameter design method for static var compensators (SVCs) is proposed to balance power quality requirements with harmonic oscillation suppression. First, a port impedance model of the inverter and SVC is established to analyse the interaction mechanism. The system's characteristic roots are obtained using modal analysis. Based on these results, system damping is calculated to quantify the impact of SVC integration on stability. Furthermore, for multi-inverter grid-connected systems, an SVC parameter optimisation procedure based on particle swarm optimisation (PSO) is developed. This approach considers reactive power capacity requirements and adopts improved system damping as a design objective to achieve a balanced provision of reactive power support and resonance suppression. The effectiveness of parallel SVCs in suppressing multimodal resonance peaks and improving system damping is validated through both qualitative and quantitative analysis. Simulation and experimental results confirm that the proposed method achieves both power quality optimisation and harmonic oscillation suppression.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146136726","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":"A Monolithic SiC MOSFET Behavioural Model with Full-Temperature-Range Capability: SPICE-Compatible Structure and Experimental Verification","authors":"Shuoyu Ye,&nbsp;Jingyang Hu,&nbsp;Jianghua Zhuo,&nbsp;Haoze Luo,&nbsp;Chushan Li,&nbsp;Wuhua Li,&nbsp;Xiangning He","doi":"10.1049/pel2.70183","DOIUrl":"https://doi.org/10.1049/pel2.70183","url":null,"abstract":"<p>An accurate simulation model can guide applications such as loss estimation and key parameter evaluation for power devices. Existing SPICE-compatible models suffer from compromised accuracy-efficiency trade-offs, inadequate characterization of temperature effects, and convergence limitations. To address the limitations of conventional behavioural models, which often require numerous parameters and exhibit poor extrapolation capability, this paper proposes a novel behavioural model utilizing a tanh(x)-based channel current expression. This formulation not only inherently ensures smoothness and continuous differentiability, mitigating convergence issues, but also significantly reduces the number of core characterization parameters to just five. A stepwise parameter extraction method is given via Levenberg–Marquardt optimization to effectively prevent overfitting-induced spurious points in the output characteristics during multiparameter fitting. Recognizing the critical impact of temperature on SiC MOSFET performance, temperature effects are embedded through second-order polynomial fittings across the full operational range. In the meantime, temperature effects on critical parameters during switching transients are considered through theoretical analysis. Experimental validation via double-pulse tests across a wide temperature range confirms the model's high fidelity, with static characteristics deviation below 3%, switching loss error within 8%, and transient oscillation discrepancy under 2%, demonstrating its value for precise simulation in SiC-based converter design.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70183","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146136433","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":"PWM Dead Times in Automotive Traction Inverters using IGBT, SiC MOSFET, or Si/SiC Fusion Switch Power Modules","authors":"Tomas Reiter,&nbsp;Julius Schapdick,&nbsp;Michael Krug,&nbsp;Mark Muenzer,&nbsp;Frank Wolter","doi":"10.1049/pel2.70185","DOIUrl":"https://doi.org/10.1049/pel2.70185","url":null,"abstract":"<p>This article features a comprehensive methodology for analyzing and optimizing PWM dead time in automotive traction inverters, applicable to a wide range of power devices, including Si IGBT/Diodes, SiC MOSFETs, and Si/SiC Fusion switches. The proposed methodology enables a systematic comparison of dead time characteristics, focusing on part-to-part tolerances and operating point-dependent influence factors. Three traction inverter systems, each in the 200–300 kW class at 470 V, were built up utilizing Si IGBT/Diode, SiC MOSFET, and Si/SiC Fusion switches from the latest automotive-released technology. The impact of PWM dead times on power losses was experimentally investigated for all three inverter systems, supporting the analytical model. Key findings from the experimental data include: (1) PWM dead times can account for more than 10% of the total inverter power losses in high current density SiC MOSFET inverter designs operating at typical automotive switching frequencies of 10 kHz; (2) Optimizing PWM dead times in Si/SiC Fusion power modules leads to up to a 5% reduction in total inverter power losses and improved current sharing, resulting in lower thermal stress—This was evaluated using thermal infrared measurements from the Si/SiC Fusion inverter prototype; 3) Optimized PWM dead times can reduce total harmonic distortion at light load conditions by up to 2%–3% for IGBT/Diode and up to 4%–5% for SiC MOSFET and Si/SiC Fusion inverter systems; (4) A sensitivity study in addition revealed that Si/SiC Fusion switches exhibit the most stable dead time settings under parameter variations. The benefit of optimized versus conventional 2 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μ</mi>\u0000 <mi>s</mi>\u0000 </mrow>\u0000 <annotation>$umu{rm s}$</annotation>\u0000 </semantics></math> PWM dead times would result in an annual energy saving of approximately 6 GWh per 1 million vehicles. This highlights the significance of optimized PWM dead times in automotive traction inverters operating at typical switching frequencies of 10 kHz. The goal of this investigation is to support the development of reliable and efficient automotive traction inverters, with the methods presented being applicable to other applications as well.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146130176","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":"Non-Contact Turn-Off Time Measurement Method for IGBTs in the Half-Bridge Submodule Configuration of MMC","authors":"Jiyun Liu,&nbsp;Bowen Gu,&nbsp;Tianqi Li,&nbsp;Jian Luo,&nbsp;Zhonghao Dongye,&nbsp;Yuzheng Huang,&nbsp;Bing Ji,&nbsp;Lei Qi","doi":"10.1049/pel2.70177","DOIUrl":"https://doi.org/10.1049/pel2.70177","url":null,"abstract":"<p>Modular multilevel converters (MMCs) are widely employed in power applications due to their modular scalability, excellent harmonic suppression capability, and low-loss characteristics. However, their reliability is constrained by the insulated-gate bipolar transistor (IGBT) devices within the submodules. Consequently, improving the reliability of IGBT devices is crucial for enhancing the overall performance of MMCs. In recent years, state monitoring techniques based on dynamic electrical parameters have emerged as an effective means to improve IGBT reliability. Among these parameters, turn-off time is a key health indicator and is widely used for junction temperature monitoring and failure mode detection. This study presents a non-contact turn-off time measurement method based on the load common-mode current decay during the turn-off process, aiming to overcome the limitations of existing electrical measurement methods. By leveraging existing load current monitoring, real-time monitoring of IGBT turn-off time can be achieved without disrupting normal equipment operation. Experimental results demonstrate that this method can accurately monitor turn-off time and evaluate its impact on variations in load current, capacitor voltage, and junction temperature. The feasibility of this method for practical engineering applications is validated through MMC power-equivalent experimental results.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146091360","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":"A Novel Coordinated Control Strategy Between the Grid-forming SVG Equipped With Supercapacitors and Renewable Energy Gathering Stations to Support Frequency Stability","authors":"Jianhui Meng,&nbsp;Rufeng Zhang,&nbsp;Hui Liu,&nbsp;Hongfei Cai,&nbsp;Zhenglin Huan","doi":"10.1049/pel2.70187","DOIUrl":"https://doi.org/10.1049/pel2.70187","url":null,"abstract":"<p>Combining supercapacitors and power electronic devices, grid-forming static var generators (SVGs) can provide dynamic reactive power compensation while providing inertia support to the system, thereby enhancing the stability of renewable energy systems. However, challenges remain regarding the coordination between the inertia support from grid-forming SVG and the control actions of automatic generation control (AGC) units in renewable energy gathering stations. To address this issue; this paper proposes a coordinated control strategy that accounts for the state of charge (SOC) of supercapacitors, aiming to enhance the inertia support role of grid-forming static var generators (SVG) in renewable energy gathering stations and achieve their coordinated cooperation with the AGC system. By integrating the millisecond-level rapid response capability of grid-forming SVG and the second-level continuous regulation capability of AGC, this strategy establishes a multi-timescale active power support system: at the initial stage of a frequency dip, the grid-forming SVG independently provides rapid inertia support; subsequently, it implements coordinated power allocation with the station-level AGC while comprehensively considering the SOC of supercapacitors and the energy status of wind turbine units, thereby balancing transient frequency stability and the system's long-term continuous regulation capability. Finally, a controller-level hardware-in-the-loop test platform is established for renewable power plants. Tests under typical operating conditions demonstrate the effectiveness and superiority of the proposed strategy, indicating that it can provide enhanced support when frequency fluctuations occur in renewable energy gathering stations.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146091114","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":"A Magnetic-Shunt-Based Magnetic Structure for Coupled Inductor Filters","authors":"Christian Buzzio,&nbsp;Germán G. Oggier,&nbsp;Roberto F. Coelho,&nbsp;Denizar C. Martins,&nbsp;Obaid Aldosari","doi":"10.1049/pel2.70182","DOIUrl":"https://doi.org/10.1049/pel2.70182","url":null,"abstract":"<p>This article presents a magnetic structure for coupled inductor filters that simplifies the adjustment of the coupling factor between the windings and the target mutual and self-inductances to achieve a zero-ripple input current. The proposed structure utilizes a low-permeability ferrite polymer in the core gap. This design significantly reduces the fringing flux and restricts the leakage flux path, allowing for precise tuning of the magnetic flux path and simplifying the circuit design. The proposal also decreases the required number of turns in each of the coupled windings, increasing the overall power density. The necessary equations to design the proposed structure are determined and validated through FEA simulation and experimental testing on a step-up converter incorporating the designed coupled inductor. The results demonstrate the effectiveness of the proposed structure in achieving significant reductions in inductance requirements, enabling an increased power density while maintaining zero-ripple operation under varied conditions.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146096376","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":"Improved Efficiency of Two-Stage Partial Power Processing Architectures for Inductive Power Transfer","authors":"Hang Lu,&nbsp;Jiyao Wang","doi":"10.1049/pel2.70178","DOIUrl":"https://doi.org/10.1049/pel2.70178","url":null,"abstract":"<p>Inductive power transfer (IPT) technology has found widespread applications across various fields. As demand for IPT systems increases, single-stage IPT systems are gradually becoming inadequate to meet the increasing requirements. Therefore, two-stage IPT systems that incorporate front-end or rear-end DC/DC converter have been developed. However, the DC/DC converter in these cascaded two-stage IPT systems introduce considerable energy losses. This paper aims to mitigate the energy losses by building several high efficiency two-stage IPT system with proposed partial power processing feature. The paper first presents the proposed overall structure, followed by the development of an equivalent circuit model and a detailed power analysis. Subsequently, simulation and experimental results are provided to validate the performance of the proposed system. Under a 40 V input and 120 W output, the system achieves a maximum efficiency of 90.52%. It is then extended to a high-power scenario, where, with a 100 V input and 500 W output, the maximum efficiency reaches 95.29%. Compared to conventional two-stage IPT systems, the proposed system only processes partial power through the DC/DC converter, and hence offers reduced losses and diminished stresses on components. Therefore, a more compact design with enhanced power density and reduced overall system cost can be achieved.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70178","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146007603","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":"Mechanism Analysis of High Frequency Resonance Induced by Power-Current Loop Interaction and Self-Stability Design of Grid-Following Converters","authors":"Yihang Zhao,&nbsp;Xiaoqiang Li,&nbsp;Shijie Li,&nbsp;Mengcheng Pei,&nbsp;Xiaojie Wu","doi":"10.1049/pel2.70180","DOIUrl":"https://doi.org/10.1049/pel2.70180","url":null,"abstract":"<p>As the power conversion device between new energy generation systems and the power grid, the high-frequency resonance self-stability of the current loop of grid-following (GFL) converters has been widely researched. However, this paper finds that, in addition to the current loop, the power loop of GFL converters also has high-frequency resonance self-stability issues when adopting a closed-loop control strategy. Therefore, this paper researches the high-frequency resonance mechanism in the power loop first, and the research results show that the resonance in the power loop is induced by power-current loop interaction, which results from the mismatched control parameters between the power loop and the current loop. Based on this, a self-stability design method is proposed in this paper. This method reduces power-current loop interaction by designing the power loop control parameters based on existing current loop constraints, thereby suppressing the high-frequency resonance in the power loop. Finally, the experimental results validate the feasibility and effectiveness of the theoretical analysis and the proposed design method.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"19 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146091233","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}