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Relationship and Comparative Analysis of Three Complex Power Vectors-Based Model Predictive Control Under Unbalanced Networks 不平衡网络下三种复杂功率矢量模型预测控制的关系及比较分析
Pub Date : 2024-07-11 DOI: 10.1109/JESTIE.2024.3426494
Xiaohong Ran;Bo Xu;Kaipei Liu;Yangsheng Liu
The previous studies examined the relationship between traditional complex power (TCP) and extended complex power (ECP)-based direct power controls (DPCs). A novel complex power (NCP) is modeled, and we then study the relationship between the NCP and existing complex powers. The frameworks of TCP-, ECP-, and NCP-based model predictive DPC (MPDPC) are established and studied using mathematical models and tools. Under slightly unbalanced grid voltages, we perform a comparative analysis of the above three methods. The inherent equivalence or relationship between the three methods is described in terms of power variations. Under extremely unbalanced grids, the existing TCP- and ECP-based MPDPCs cannot work well, resulting in nonsinusoidal grid currents and larger power ripples. However, the NCP-MPDPC achieves the better steady-state performance. To reveal their inherent relationships, we conduct a comparative study from their output reference voltages. Finally, we are stimulated to design an NCP-based MPDPC. The MPDPC method is realized by selecting one extended active vector and a zero vector. The duty cycles of all voltage vectors are redesigned to achieve sinusoidal grid current and minimize total harmonic distortion (THD). Both the simulations and experiments validate the effectiveness of their inherent relationships of three methods.
以往的研究考察了传统复杂功率(TCP)与基于扩展复杂功率(ECP)的直接功率控制(DPCs)之间的关系。建立了一种新的复杂功率模型,并研究了该模型与已有的复杂功率之间的关系。利用数学模型和工具,建立并研究了基于TCP、ECP和ncp的模型预测DPC (MPDPC)框架。在电网电压略有不平衡的情况下,对上述三种方法进行了对比分析。从功率变化的角度描述了三种方法之间的内在等价或关系。在电网极不平衡的情况下,现有的基于TCP和ecp的mpdpc不能很好地工作,导致电网电流非正弦和功率波动较大。而NCP-MPDPC则具有较好的稳态性能。为了揭示它们的内在关系,我们从它们的输出参考电压进行了比较研究。最后,我们设计了一个基于ncp的MPDPC。MPDPC方法通过选择一个扩展活动向量和一个零向量来实现。重新设计了所有电压矢量的占空比,以实现正弦栅极电流和最小化总谐波失真(THD)。仿真和实验验证了三种方法内在联系的有效性。
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引用次数: 0
Force Estimation From Surface-EMG Using Element Description Method 基于单元描述法的表面肌电信号力估计
Pub Date : 2024-07-10 DOI: 10.1109/JESTIE.2024.3426034
Daiki Sodenaga;Issei Takeuchi;Daswin De Silva;Seiichiro Katsura
There are two main contributions in this article. One of them is to have generated the interpretable model about the relationship between sEMG and force. The other is to have conducted on estimating force from sEMG with the same level accuracy as the conventional method. As the above, we proposed the effective modeling method to estimate the human force from surface-electromyography (sEMG) in this article. A sEMG is one of the human biological signal and it indicates muscle contractions. In the conventional research, the force estimation from sEMG has been conducted. However, the calculation process between sEMG and force is unclear because those methods are the machine learning such as the DNN, etc. From the above, it could not be considered about the relationship between input and output based on the model. Then, we proposed the element description method (EDM) which can generate the model whose calculation process is not black box for the force estimation from sEMG in this article. We compared the conventional method (DNN) with the EDM in this article. As the result, the root mean square error with an EDM was same degree with the DNN. Moreover, the model with an EDM was more effective than the DNN because the calculating process of the model by an EDM was interpretable. From the above, we could show the effectiveness of the proposed method in this article.
本文有两个主要贡献。其中之一是生成了表面肌电信号与力之间关系的可解释模型。二是对表面肌电信号的力估计进行了与常规方法准确度相同的研究。综上所述,本文提出了一种有效的基于表面肌电图(表面肌电图)的人体力估计建模方法。表面肌电信号是人体的一种生物信号,它指示肌肉收缩。在传统的研究中,已经进行了表面肌电信号的力估计。然而,表面肌电信号和力之间的计算过程尚不清楚,因为这些方法是机器学习,如深度神经网络等。由此可见,基于模型不能考虑输入和输出之间的关系。然后,我们提出了一种元素描述法(EDM),该方法可以生成计算过程不是黑盒子的模型,用于表面肌电信号的力估计。我们比较了传统方法(DNN)和电火花加工(EDM)。结果表明,EDM的均方根误差与DNN的误差程度相同。此外,由于电火花加工模型的计算过程是可解释的,电火花加工模型比深度神经网络更有效。由此可以看出本文所提出方法的有效性。
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引用次数: 0
Simplified Prediction-Based AI-IoT Model for Energy Management Scheme in Standalone PV Powered Greenhouse 基于简化预测的AI-IoT模型的独立光伏温室能源管理方案
Pub Date : 2024-07-09 DOI: 10.1109/JESTIE.2024.3425670
Soumya Ranjan Biswal;Tanmoy Roy Choudhury;Subhendu Bikash Santra;Babita Panda;Subhrajyoti Mishra;Sanjeevikumar Padmanaban
Automated greenhouse is essential for sustainable development and food security. Photovoltaic (PV) power with physical sensors-based control using Internet of Things needs high initial investment and operational cost. This also needs significant installed storage capacity. In the proposed solution, the dependency on physical sensors like temperature, humidity, soil moisture sensors, etc., are eliminated due to the application of eXtreme Gradient Boosting-based machine learning (ML) algorithm. The training and testing of ML algorithm are performed with one-year physical data (approx. 50k @10 min interval) from greenhouse which provides accurate mapping (Temperature MAPE: 1.51%, R2: 0.9785 and Humidity MAPE: 1.68%, R2: 0.9867) between predicted and sensor data. Also, a novel priority-based demand side management scheme is implemented which includes load shifting which reduces the requirement of installed PV and storage capacity. A reduction of 63.27% storage capacity is possible with proposed control approach. ML algorithm is programmed using Python language and implemented in Raspberry Pi-3B+ SBC. For physical verification of the proposed control unit, a laboratory-based prototype is developed with PV emulator (1.5 kW), programmable electronic load box, and relay unit controlled through Arduino UNO, Raspberry Pi-3B+ SBC, ESP-32 Combo unit.
自动化温室对可持续发展和粮食安全至关重要。基于物联网物理传感器控制的光伏发电初期投资和运营成本较高。这也需要安装大量的存储容量。在提出的解决方案中,由于应用了基于极端梯度增强的机器学习(ML)算法,消除了对温度、湿度、土壤湿度传感器等物理传感器的依赖。机器学习算法的训练和测试是用一年的物理数据(大约。50k @10 min间隔),提供了预测数据和传感器数据之间的精确映射(温度MAPE: 1.51%, R2: 0.9785,湿度MAPE: 1.68%, R2: 0.9867)。此外,还实施了一种新的基于优先级的需求侧管理方案,该方案包括负载转移,从而减少了对安装光伏和存储容量的需求。采用所提出的控制方法,可以减少63.27%的存储容量。ML算法采用Python语言编写,在Raspberry Pi-3B+ SBC上实现。为了对所提出的控制单元进行物理验证,开发了一个基于实验室的原型,其中包括PV模拟器(1.5 kW)、可编程电子负载箱和通过Arduino UNO、Raspberry Pi-3B+ SBC、ESP-32 Combo单元控制的继电器单元。
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引用次数: 0
Voltage Control of the Ćuk Converter for Grid-Forming in DC Grids: An Energy-Based Approach 用于直流电网并网的Ćuk 转换器的电压控制:基于能量的方法
Pub Date : 2024-07-09 DOI: 10.1109/JESTIE.2024.3425518
Marco Guerreiro;Pedro dos Santos;Steven Liu
Grid-forming converters in dc microgrids will have a key role in the next generation power system. These converters are responsible for stabilizing the bus voltage in a grid dominated by constant power loads, a task that requires highly dynamic voltage control loops. This article presents an energy-based method to control the output voltage of an isolated Ćuk converter, a high-order nonlinear system. The main motivation behind the energy-based method is to control the total energy of the converter. In many cases, most of the energy is stored in the output capacitor of the converter, and controlling total energy allows shaping the output voltage directly. By using feedback linearization, we show that it is possible to use a linear controller to control energy, and that the internal dynamics resulting from feedback linearization is stable. The energy-based method results in a single-loop controller capable of naturally handling constant power loads, characteristics that make it well suited for voltage control of grid-forming converters. The proposed controller is verified by experimental results, using an isolated Ćuk converter to supply a constant power load.
直流微电网中的成网变流器将在下一代电力系统中发挥关键作用。这些变流器负责稳定恒功率负载主导的电网中的母线电压,这项任务需要高度动态的电压控制回路。本文介绍了一种基于能量的方法,用于控制隔离式 Ćuk 转换器(一种高阶非线性系统)的输出电压。基于能量的方法背后的主要动机是控制转换器的总能量。在许多情况下,大部分能量都储存在转换器的输出电容器中,控制总能量可以直接塑造输出电压。通过使用反馈线性化,我们证明了使用线性控制器控制能量是可行的,而且反馈线性化产生的内部动态是稳定的。基于能量的方法产生的单回路控制器能够自然处理恒定功率负载,其特性使其非常适合电网形成转换器的电压控制。利用一个隔离的 Ćuk 转换器来提供恒功率负载,实验结果验证了所提出的控制器。
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引用次数: 0
Design Method of Impedance Matching Network for High Power Cascaded Class-E Inverter 大功率级联e类逆变器阻抗匹配网络设计方法
Pub Date : 2024-07-09 DOI: 10.1109/JESTIE.2024.3425750
Hui Wang;Chen Chen;Lifang Ha;Shiming Xie;Guangfu Ning;Mei Su;Xinyan Huang
Class-E inverters are widely used in high-frequency power conversion applications, and impedance matching networks are commonly used to match various loads to the given drain-source impedance required for class E inverter. However, due to the influence of the stray parameters in high-frequency circuit, fast and accurate design of the impedance matching network is still challenging. In this article, a design method of impedance matching network for cascaded class E inverters is proposed. The impedance matching network design method presented in this article prioritizes the design of the filter network to meet the waveform quality requirements, then adjusts the real part of the impedance using shunt capacitors, and finally adjusts the imaginary part of the impedance using an LC series circuit. In the driver circuit, the gate-source impedance including parasitic parameters of the main circuit switch is extracted to accomplish impedance matching. The correctness and effectiveness of the proposed scheme is verified by a 13.56 MHz, 5 kW experimental prototype, and experimental waveforms show good impedance matching and high output waveform quality.
E类逆变器广泛用于高频功率转换应用,阻抗匹配网络通常用于将各种负载匹配到E类逆变器所需的给定漏源阻抗。然而,由于高频电路中杂散参数的影响,快速准确地设计阻抗匹配网络仍然是一个挑战。本文提出了一种级联E类逆变器阻抗匹配网络的设计方法。本文提出的阻抗匹配网络设计方法,首先设计满足波形质量要求的滤波网络,然后利用并联电容调整阻抗的实部,最后利用LC串联电路调整阻抗的虚部。在驱动电路中,提取包含主电路开关寄生参数的栅极源阻抗,实现阻抗匹配。通过13.56 MHz、5 kW的实验样机验证了该方案的正确性和有效性,实验波形阻抗匹配良好,输出波形质量高。
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引用次数: 0
Officers and Vice Presidents of Co-Sponsoring Societies Information 共同赞助学会的主席团成员和副主席信息
Pub Date : 2024-07-08 DOI: 10.1109/JESTIE.2024.3419636
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引用次数: 0
IEEE Industrial Electronics Society Information IEEE 工业电子学会信息
Pub Date : 2024-07-08 DOI: 10.1109/JESTIE.2024.3419638
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引用次数: 0
Journal of Emerging and Selected Topics in Industrial Electronics Publication Information 工业电子学新专题与选题》期刊 出版信息
Pub Date : 2024-07-08 DOI: 10.1109/JESTIE.2024.3419634
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引用次数: 0
Feedback Operating Frequency Control for Eliminating Dead Zone in Dynamic Wireless Power Transfer 动态无线输电中消除盲区的反馈工作频率控制
Pub Date : 2024-07-01 DOI: 10.1109/JESTIE.2024.3420121
Yutaka Shikauchi;Ryo Matsumoto;Sakahisa Nagai;Toshiyuki Fujita;Osamu Shimizu;Hiroshi Fujimoto
Dynamic wireless power transfer using repeater coils is studied as a cost-effective method that allows a single inverter to supply power to multiple transmitter coils. However, this method has a zone where the receiver coil positions on a transmitter coil called a dead zone. In the dead zone, the transfer efficiency and received power are significantly reduced. This is caused by matching the series resonance frequencies of each closed-loop circuit with the operating frequency of the inverter. Therefore, this article proposes the operating frequency control of the inverter to improve the power factor, which increases the efficiency and received power. The angle difference between the inverter output voltage and current is measured, and the operating frequency is controlled using a proportional–integral controller so that the angle difference becomes 0. From the experimental results, it was confirmed that the efficiency is 0.90 and the received power increases by $text{1.33} ,text{kW}$ when the operating frequency in the dead zone is not fixed compared to when it was fixed. In addition, the settling time of the operating frequency and angle difference was compared between the hill climbing algorithm and the proportional–integral controller. The settling time decreased by $text{2.9} ,text{ms}$.
研究了利用中继器线圈进行动态无线电力传输的一种经济有效的方法,该方法允许单个逆变器向多个发射线圈供电。然而,这种方法有一个区域,其中接收器线圈的位置上的发射机线圈称为死区。在死区,传输效率和接收功率显著降低。这是由于每个闭环电路的串联谐振频率与逆变器的工作频率相匹配造成的。因此,本文提出对逆变器的工作频率进行控制,以提高功率因数,从而提高了效率和接收功率。测量逆变器输出电压和电流之间的角度差,并使用比例积分控制器控制工作频率,使角度差变为0。实验结果证实,与固定死区工作频率相比,不固定死区工作频率时效率为0.90,接收功率增加1.33,kW。此外,比较了爬坡算法和比例积分控制器的工作频率和角度差的沉降时间。沉降时间减少$text{2.9} ,text{ms}$。
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引用次数: 0
A Smith Predictor Based High-Frequency Oscillation Suppression Method for VSC-HVDC System 基于史密斯预测器的 VSC-HVDC 系统高频振荡抑制方法
Pub Date : 2024-07-01 DOI: 10.1109/JESTIE.2024.3418215
Siqi Liu;Pengfei Hu;Yiqi Liu;Naixuan Zhu;Yanxue Yu;Daozhuo Jiang
This article presents a novel method to suppress high-frequency oscillations (HFOs) in voltage-source converters (VSCs) based high-voltage direct current (HVDC) systems. The analysis reveals that the main reason for HFOs is the negative damping of the VSC-HVDC impedance at high frequencies, which results from the time delay of the control system. The proposed method employs a Smith predictor to directly compensate for the time delay of the VSC-HVDC control system and eliminate the HFOs. The article first reviews the instability mechanism of VSC-HVDC systems. Then, it presents the Smith-predictor-based control method for HFO suppression and evaluates its robustness. Finally, the proposed method and theoretical analysis are verified by simulation and hardware-in-the-loop tests results.
本文介绍了一种抑制基于电压源变换器(VSC)的高压直流(HVDC)系统中高频振荡(HFOs)的新方法。分析表明,产生高频振荡的主要原因是控制系统的时间延迟导致 VSC-HVDC 阻抗在高频时产生负阻尼。所提出的方法采用 Smith 预测器直接补偿 VSC-HVDC 控制系统的时间延迟,消除了 HFOs。文章首先回顾了 VSC-HVDC 系统的不稳定机制。然后,介绍了基于史密斯预测器的 HFO 抑制控制方法,并评估了其鲁棒性。最后,通过仿真和硬件在环测试结果验证了所提出的方法和理论分析。
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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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