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Pub Date : 2024-04-17 DOI: 10.1109/JESTIE.2024.3366080
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引用次数: 0
Call for Papers: Special Section on High sustainable electric drives for transportation electrification 征稿启事交通运输电气化的高可持续性电力驱动特别分会
Pub Date : 2024-04-17 DOI: 10.1109/JESTIE.2024.3385331
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引用次数: 0
Call for Papers: Special Section on Grid-Forming Converter Dominated Power Systems 征稿启事变流器主导型电网电力系统特别分会
Pub Date : 2024-04-17 DOI: 10.1109/JESTIE.2024.3385330
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引用次数: 0
Dynamic Global Maximum Power Point Tracking for Partially Shaded PV Arrays in Grid-Connected PV Systems 并网光伏系统中部分遮挡光伏阵列的动态全局最大功率点跟踪
Pub Date : 2024-04-16 DOI: 10.1109/JESTIE.2024.3389686
Georgios I. Orfanoudakis;Emmanouil Lioudakis;Georgios Foteinopoulos;Eftichios Koutroulis;Weimin Wu
Global maximum power point tracking (GMPPT) algorithms can extract the maximum available power from photovoltaic (PV) arrays even under partial shading conditions (PSCs). The existing GMPPT algorithms originate from computationally-intensive optimization (heuristic) or artificial intelligence concepts, which operate in discrete time steps and impose intense variations to the demanded PV array voltage/current. These result in undesirable disturbances, which increase the overall time required for the GMPPT process to complete and affect the quality of power injected to the grid. In this article, a new GMPPT method with low computational complexity is presented, which exploits the dynamic response of the PV system. The proposed GMPPT technique can track the GMPP in significantly less time when applied to PV inverters with high PV-side capacitances, guarantee convergence to the GMPP even under complex PSCs, while also avoiding the aforementioned disturbances. The performance of the proposed GMPPT method is evaluated using an experimental setup incorporating a 2-kW single-phase grid-tied transformerless PV inverter and a rooftop PV array. The experimental results show that it can identify the GMPP in approximately 1 s under various operating conditions, which is more than 95% faster than the power-voltage curve scanning and particle swarm optimization GMPPT algorithms.
全局最大功率点跟踪(GMPPT)算法可以从光伏(PV)阵列中提取最大可用功率,即使在部分遮光条件(PSC)下也是如此。现有的 GMPPT 算法源于计算密集型优化(启发式)或人工智能概念,以离散的时间步长运行,并对所需的光伏阵列电压/电流施加强烈变化。这些变化会产生不良干扰,增加 GMPPT 过程完成所需的总时间,并影响注入电网的电能质量。本文介绍了一种计算复杂度较低的新型 GMPPT 方法,该方法利用了光伏系统的动态响应。当应用于具有高光伏侧电容的光伏逆变器时,所提出的 GMPPT 技术能在更短的时间内跟踪 GMPP,即使在复杂的 PSC 下也能保证收敛到 GMPP,同时还能避免上述干扰。通过实验装置,结合 2 千瓦单相并网无变压器光伏逆变器和屋顶光伏阵列,对所提出的 GMPPT 方法的性能进行了评估。实验结果表明,在各种运行条件下,该方法能在约 1 秒内识别出 GMPP,比功率-电压曲线扫描和粒子群优化 GMPPT 算法快 95% 以上。
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引用次数: 0
An Improved Model Predictive Current Control of Five-Phase PMSM Drive for Torque and Flux Ripple Alleviation 五相 PMSM 驱动器的改进型模型预测电流控制,用于降低转矩和磁通波纹
Pub Date : 2024-04-16 DOI: 10.1109/JESTIE.2024.3389293
Puli Rajanikanth;Vinay Kumar Thippiripati
The model predictive current control (MPCC) is the popular technique for five-phase permanent magnet synchronous motor (FP-PMSM) drives. However, the implementation of the MPCC algorithm is difficult for a five-phase two-level voltage source inverter fed PMSM drive due to more switching states and an increased number of calculations. The conventional MPCC (CMPCC) methods involve larger computations and limited control over third-order harmonics. To address these issues, an improved MPCC method is presented for the FP-PMSM drive using preselection of voltage vectors. In this scheme, from the previous sample voltage vector information, a five-voltage vector group is formed. One of the voltage vectors in the group is specially intended to reduce the harmonic currents. The five grouped vectors are used for predicting the stator currents and cost function optimization. The optimal voltage vector among these five vectors is determined and applied in the next sample period to achieve the control of currents and subsequently the torque and flux in fundamental and harmonic subspaces. The proposed scheme is experimentally verified to determine its efficacy in reducing flux ripple, torque ripple, and computational burden and compared the obtained results with the CMPCC schemes and other MPCC schemes reported in the literature recently.
模型预测电流控制 (MPCC) 是五相永磁同步电机 (FP-PMSM) 驱动器的常用技术。然而,由于开关状态较多,计算量增加,因此对于五相两电平电压源逆变器馈电的 PMSM 驱动器来说,MPCC 算法的实施比较困难。传统的 MPCC(CMPCC)方法计算量较大,对三阶谐波的控制有限。为解决这些问题,本文提出了一种使用预选电压矢量的 FP-PMSM 驱动器改进 MPCC 方法。在该方案中,根据之前的样本电压矢量信息,形成一个五电压矢量组。组中的一个电压矢量专门用于降低谐波电流。五组矢量用于预测定子电流和成本函数优化。确定这五个矢量中的最优电压矢量,并将其应用于下一个采样周期,以实现电流控制,进而控制基波和谐波子空间中的转矩和磁通。对所提出的方案进行了实验验证,以确定其在减少磁通纹波、转矩纹波和计算负担方面的功效,并将所获得的结果与 CMPCC 方案和最近文献中报道的其他 MPCC 方案进行了比较。
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引用次数: 0
Common Mode and Terminal Voltages With Effect of Device Junction Capacitance in Five-Level Transformerless PV Inverter 五级无变压器光伏逆变器中受器件结电容影响的共模电压和终端电压
Pub Date : 2024-04-11 DOI: 10.1109/JESTIE.2024.3387694
MLN Vital;Venu Sonti;Sanjeevikumar Padmanaban;Sachin Jain
This article presents the analysis of common mode and terminal voltages by considering the effect of device junction capacitance in single-phase dc-decoupled transformerless PV inverter configuration. The common mode and terminal voltages (CMTVs) analysis considers device junction capacitance (DJC), inverter structure, and switching pattern. The generalized expression for CMTVs is derived considering DJC, inverter structure, and switching pattern. The inverter structure and pulsewidth modulation (PWM) technique can be modified or designed to minimize or eliminate the high-frequency switching transitions using the derived generalized expression of CMTVs. This further alleviates the common mode and leakage currents flowing through the parasitic capacitance of the PV inverter system. Furthermore, an improved PWM technique is also designed for the five-level cascaded multilevel inverter, which reduces the distortions in the inverter output current apart from alleviating the leakage current. This article presents a detailed analysis for the derivation of generalized expression using the given device junction capacitance-based switching function analysis. The derived expression is further validated using simulation and experimental results.
本文通过考虑单相直流去耦无变压器光伏逆变器配置中器件结电容的影响,对共模电压和端电压进行了分析。共模和端电压(CMTVs)分析考虑了器件结电容(DJC)、逆变器结构和开关模式。考虑到 DJC、逆变器结构和开关模式,得出了 CMTV 的广义表达式。利用推导出的 CMTV 广义表达式,可以修改或设计逆变器结构和脉宽调制 (PWM) 技术,以尽量减少或消除高频开关转换。这将进一步减轻流经光伏逆变器系统寄生电容的共模电流和漏电流。此外,还为五级级联多电平逆变器设计了一种改进的 PWM 技术,除了减轻漏电流外,还减少了逆变器输出电流的失真。本文详细分析了利用给定的基于器件结电容的开关功能分析推导广义表达式的过程。仿真和实验结果进一步验证了推导出的表达式。
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引用次数: 0
A High Voltage-Gain DC–DC Converter With Low Switch Voltage Stress 具有低开关电压应力的高电压增益 DC-DC 转换器
Pub Date : 2024-04-09 DOI: 10.1109/JESTIE.2024.3386555
Liqing Liao;Bo Yuan;Guangfu Ning;Wenjing Xiong;Mei Su
In this article, a high voltage gain dc–dc converter is proposed for renewable power generation applications. The proposed converter includes a former step-up unit and z (z>1) resonant step-up units. The former unit includes two stages of boost circuits with a coupled inductor primary winding in each stage and the inputs and outputs of the two-stage boost circuits are connected in series. Each resonant step-up unit is composed of two secondary windings of coupled inductors, two secondary leakage inductors, one resonant capacitor, and two diodes. The former step-up unit and the secondary windings contribute to high voltage gain. Meanwhile, all the switches and diodes can be considered as two devices connected in series. Therefore, the voltage stresses are lower than the output voltage, especially the switches. In addition, the resonant unit helps to achieve zero-current-switching of the diodes. To verify the feasibility of the proposed converter, a 180-W laboratory prototype with only one resonant step-up unit has been built.
本文提出了一种用于可再生能源发电应用的高电压增益直流-直流转换器。该转换器包括一个前升压单元和 z(z>1)谐振升压单元。前级单元包括两级升压电路,每级都有一个耦合电感初级绕组,两级升压电路的输入和输出串联连接。每个谐振升压单元由两个耦合电感器次级绕组、两个漏电电感器次级绕组、一个谐振电容器和两个二极管组成。前一个升压单元和次级绕组有助于实现高电压增益。同时,所有开关和二极管可视为串联的两个器件。因此,电压应力低于输出电压,尤其是开关。此外,谐振单元有助于实现二极管的零电流开关。为了验证拟议转换器的可行性,我们制作了一个 180 瓦的实验室原型,其中只有一个谐振升压单元。
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引用次数: 0
A Three-Vector Finite Control Set Model Predictive Control Variant With Low Power Fluctuations of AC/DC Converters 具有低功率波动的 AC/DC 转换器三矢量有限控制集模型预测控制变体
Pub Date : 2024-04-08 DOI: 10.1109/JESTIE.2024.3386179
Xiaohong Ran;Bo Xu;Kaipei Liu;Yangsheng Liu
Under severe unbalance of grid voltages, achieving sinusoidal grid currents while eliminating large power fluctuations is important, but the current methods are ineffective in selecting optimal voltages and duty cycle. Therefore, we propose a finite control set three-vector model predictive control based on the extended active power (FCSTV-MPC-EAP) to attain much better total harmonic distortion of grid currents and the lowest power fluctuations. The proposed FCSTV-MPC-EAP approach realizes the objective by selecting two extended active vectors and a zero vector, with their duty cycles reconfigured from fixed phase and magnitude to arbitrary values. Comparative analysis of the proposed approach on an ac/dc converter against other techniques validate the effectiveness of the FCSTV-MPC-EAP method.
在电网电压严重不平衡的情况下,实现正弦电网电流并消除大的功率波动非常重要,但目前的方法在选择最佳电压和占空比方面效果不佳。因此,我们提出了一种基于扩展有功功率的有限控制集三矢量模型预测控制(FCSTV-MPC-EAP),以获得更好的电网电流总谐波失真和最低的功率波动。拟议的 FCSTV-MPC-EAP 方法通过选择两个扩展有功矢量和一个零矢量来实现目标,其占空比可从固定相位和幅值重新配置为任意值。在交流/直流转换器上对所提方法与其他技术进行的比较分析验证了 FCSTV-MPC-EAP 方法的有效性。
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引用次数: 0
A Hybrid Energy Sources Based System for Powertrain of Electric Vehicles 基于混合能源的电动汽车动力系统
Pub Date : 2024-04-08 DOI: 10.1109/JESTIE.2024.3385753
Ankit Kumar Singh;Anjanee Kumar Mishra;Bhavnesh Kumar
In this article, a hybrid energy sources based system is presented for powertrain of electric vehicles. The proposed system have continuous input and output currents at all the ports, which improves the cycle life of hybrid energy storages [supercapacitor (SC) and battery] and the dc-link capacitor. The SC supplies or absorbs a large amount of power during acceleration or regenerative braking operation. Moreover, the battery is avoided for frequent charging by regenerative energy, which further improves the battery's cycle life. Most of the time, the battery is used to supply energy under cruising mode. An effective and simpler control strategy have been developed for energy management among the energy sources, which provides smooth transition among the modes. A frequency domain (Bode plot) based method is used for controller design of the proposed system. Further, a detailed loss analysis of the converter presented in propulsion and regenerative braking modes. Finally, the proposed system is verified by extensive hardware results.
本文介绍了一种用于电动汽车动力系统的混合能源系统。所提出的系统在所有端口都有连续的输入和输出电流,从而提高了混合能源储存器(超级电容器(SC)和电池)以及直流链路电容器的循环寿命。在加速或再生制动运行时,超级电容器可提供或吸收大量电能。此外,通过再生能量,电池可避免频繁充电,从而进一步提高电池的循环寿命。大多数情况下,电池用于在巡航模式下提供能量。我们开发了一种有效且更简单的控制策略,用于能源之间的能量管理,从而实现各种模式之间的平稳过渡。拟议系统的控制器设计采用了基于频域(波特图)的方法。此外,还对推进和再生制动模式下的转换器进行了详细的损耗分析。最后,通过大量的硬件结果对所提出的系统进行了验证。
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引用次数: 0
Class II Ceramic Capacitor Voltage Characteristic Modeling and Compensation for AC-Connected Applications 用于交流连接应用的 II 类陶瓷电容器电压特性建模与补偿
Pub Date : 2024-04-05 DOI: 10.1109/JESTIE.2024.3385709
Daniel Zakzewski;Yidi Shen;Arafat Hasnain;Rakesh Resalayyan;Alireza Khaligh
Dielectrics used in class II multilayer ceramic capacitors offer vastly higher dielectric constants than class I ceramics or film capacitors, leading to large volumetric and cost savings. However, class II ceramic capacitors undesirably tend to have varying capacitance depending on the voltage applied across it, referred to as voltage characteristic of capacitance (VCC). When class II ceramic capacitors are connected to an ac-source, VCC can contribute large harmonic content, adversely impacting power quality. If left unmitigated, additional filtering may be required to meet electromagnetic compatibility (EMC) standards, thus, reducing volumetric benefits of class II ceramic capacitors. Furthermore, control systems relying on accurate feedforward require predictive control of such effects. This work introduces a compensation strategy to mitigate current distortions induced by VCC, leading to an enhancement in converter power quality without the need for additional filtering. To achieve satisfactory mitigation with minimal control burden, the article also proposes a mathematical model describing the voltage characteristic. A design application is used to demonstrate the relevant tradeoffs and the effectiveness of the proposed compensation approaches in enhancing power quality performance is validated through experimental testing.
与 I 类陶瓷或薄膜电容器相比,II 类多层陶瓷电容器中使用的电介质具有更高的介电常数,从而节省了大量体积和成本。然而,II 类陶瓷电容器的电容值往往会随其两端的电压而变化,这就是所谓的电容电压特性 (VCC)。当 II 类陶瓷电容器连接到交流电源时,VCC 会产生大量谐波,对电能质量产生不利影响。如果不加以缓解,可能需要额外的滤波来满足电磁兼容性(EMC)标准,从而降低 II 类陶瓷电容器的体积效益。此外,依赖精确前馈的控制系统需要对此类效应进行预测控制。这项工作引入了一种补偿策略,以减轻 VCC 引起的电流失真,从而提高转换器的电能质量,而无需额外的滤波。为了以最小的控制负担实现令人满意的缓解效果,文章还提出了一个描述电压特性的数学模型。文章利用一个设计应用来展示相关的权衡,并通过实验测试验证了所提出的补偿方法在提高电能质量性能方面的有效性。
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引用次数: 0
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IEEE Journal of Emerging and Selected Topics in Industrial Electronics
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