检索结果-内蒙古大学图书馆

Predictive functional control based on particle swarm optimisation algorithm for MIMO process with time delay

INTERNATIONAL JOURNAL OF MODELLING IDENTIFICATION AND CONTROL 2021年第1期39卷 29-38页

作者： Ghadiri, Hamid Khodadadi, Hamed Razavi, S. Ehsan Islamic Azad Univ Qazvin Branch Fac Elect Biomed & Mech Engn Qazvin Iran Islamic Azad Univ Khomeinishahr Branch Dept Elect Engn Esfahan Iran Islamic Azad Univ Dept Elect Engn Mashhad Branch Mashhad Razavi Khorasan Iran

The present study aims to propose a method for designing a predictive functional control (PFC) based on the particle swarm optimisation (PSO) algorithm for the multi-input multi-output (MIMO) process with time delay. Due to the cross-coupling, time delay, and other MIMO industrial process challenges, the classical controller could not overcome the system challenges. PFC is a model-based predictive controller that uses the state-space equations of the system. According to the results, the optimisation problem is resolved using the PSO for determining the optimal controller parameters. The incorporated PFC and PSO's performance as the proposed controller is evaluated using simulations on the chamber pressure coke furnace as a MIMO process with time-delay. The simulation results demonstrate that the PFC variables tuned by the PSO approach have better performance compared to the conventional PFC, especially in the presence of disturbances and uncertainty.

关键词： multi-input multi-output MIMO time delay predictive functional control PFC particle swarm optimisation PSO chamber pressure

来源：评论

学校读者我要写书评

暂无评论

A novel dual-band-high-gain terahertz MIMO antenna

引用

MODERN PHYSICS LETTERS B 2024年第17期38卷

作者： Zhang, Rui Zhang, Yonggang Liang, Lanju Yao, Haiyun Yan, Xin Tian, Zhongjun Li, Zhenhua Wang, Ziqun Hu, Xiaofei Cao, Xin Yin, Kehao Liu, Wei Feng, Zhenwei Huang, Chengcheng Anhui Univ Sci & Technol Sch Elect & Informat Engn Huainan 232001 Anhui Peoples R China Zaozhuang Univ Sch Optoelect Engn Zaozhuang 277160 Peoples R China Zaozhuang Univ Sch Informat Sci & Engn Zaozhuang Peoples R China

In this study, a terahertz dual-band-high-gain, multi-input-multi-output (MIMO) antenna with two and four input ports was realized, with gain values of up to 7.16dBi and 6.44dBi, respectively. This represents an increase in gain of 102.4% and 81.8%, respectively, compared to single-input port antennas. By calculating and analyzing the voltage standing wave ratio (VSWR), gain, envelope correlation coefficient (ECC), and diversity gain, the two MIMO antennas achieved perfect impedance matching at their resonance points. Moreover, the interference between the elements of the MIMO antenna was small, and an isolation effect between the units was realized. These MIMO antennas can achieve multiple input signals to regulate the antenna radiation performance and improve signal strength and quality. In addition, they possess good development prospects for achieving high-speed data transmission in the terahertz band and in mobile communication.

关键词： multi-input multi-output voltage standing wave ratio envelope correlation coefficient directivity gain

来源：评论

学校读者我要写书评

暂无评论

Fault-tolerant virtual synchronous generator control of inverters in synchronous generator-based microgrids

引用

ELECTRIC POWER SYSTEMS RESEARCH 2023年第1期218卷

作者： Khajesalehi, Jasem Afjei, Seyed Ebrahim Shahid Beheshti Univ Dept Elect & Comp Engn Tehran Iran

Virtual synchronous generator (VSG) control approach which mimics the behavior of conventional synchronous generator (SG) is an attractive solution to integrate low inertia inverter-based distributed energy resources into SG-based microgrids (MGs). As a result, parallel operation of VSGs and SG is a common practice to guarantee the stability of the MGs. Induction motors (IMs) with heavy reactive power demand during acceleration in post-fault condition heighten the risk of instability of SG-based MGs in islanding subsequent to faults. In this paper a novel VSG control system based on the concept of VSG is developed for inverters operating in parallel with SG to improve the voltage and frequency stability of MG with high penetration of IM loads during faults. For this purpose, a fault tolerant enhancement (FTE) module is added to the core of the VSG control system. Accurate reference power tacking in grid-connected (GC) mode, the capability of forming a MG in stand-alone (SA) mode when the SG is out of service and resistance against the grid disturbance are other merits of employing the proposed control system. A current limiting strategy is adopted to restrict the inverter current during fault without devastating control system operation and causing instability. Moreover, a systematic approach for design of a robust dual loop multi-input multi-output (MIMO) control system for inverters is proposed. A new dynamic modeling approach is developed in order to analyze the behavior of the proposed control system and design control parameters. Extensive simulations conducted in MATLAB/Simulink are used to substantiate the effectiveness of the proposed control. It is concluded in simulations that, unlike conventional VSG control, the proposed VSG maintains the voltage and frequency stability of the overall MG in islanding subsequent to a 140 ms fault. Furthermore, the proposed MIMO control and associated current limiting strategy improves the stability when a 140 ms fault occ

关键词： virtual synchronous generator inverter synchronous generator microgrid Induction motor multi-input multi-output

来源：评论

学校读者我要写书评

暂无评论

L₁ adaptive controller for a class of non-affine multi-input multi-output nonlinear systems

引用

INTERNATIONAL JOURNAL OF CONTROL 2013年第2期86卷 348-359页

作者： Luo, Jie Cao, Chengyu Yang, Qinmin Univ Connecticut Dept Mech Engn Storrs CT 06269 USA Zhejiang Univ Dept Control Sci & Engn Hangzhou Zhejiang Peoples R China

In this article, an extension of the L-1 adaptive control design is introduced for a class of non-affine multi-input multi-output nonlinear systems with unknown dynamics and unmeasured states. The system dynamics is represented in the normal form with the bounded-input-bounded-output internal dynamics. At first, a stable virtual reference counterpart is constructed. Thereafter, a piece-wise continuous adaptive law is introduced to the actual system along with a low-pass filtered control signal that allows for achieving arbitrarily close tracking of the input and the output signals of the reference system. Rigorous mathematical proof is provided, and the theoretical results are verified with the simulation.

关键词： L-1 adaptive control non-affine nonlinear systems multi-input multi-output

来源：评论

学校读者我要写书评

暂无评论

Redundancy and Fault-Tolerant Design of Rotational MIMO Wireless Power Transfer System 18

Redundancy and Fault-Tolerant Design of Rotational MIMO Wire...

引用

18th IEEE Vehicle Power and Propulsion Conference (IEEE VPPC)

作者： Wang, De'an Qiao, Yongkang Zhang, Jiantao Bie, Zhi Zhang, Xinyu Cui, Shumei Song, Kai Zhu, Chunbo Harbin Inst Technol Sch Elect Engn & Automat Harbin Peoples R China

ISBN: (纸本)9781665405287

Wireless power transfer (WPT) technology provides a new energy transmission solution, which completely removes the shackles of wires. Although the magnetic coupler of the WPT system has a high degree of integration, it can still avoid power fluctuation and even system failure in long-term work. In this paper, some early works of redundancy and fault-tolerant design in WPT systems are reviewed, and a kind of redundancy and fault-tolerant design method of the rotational wireless power transfer system is proposed. Both passive and active fault-tolerant control (FTC) methods for the WPT system were put forward at the same time. Two redundant coil structures of the magnetic coupler are designed by magnetic and circuit fault tolerance method of the multi-input multi-output (MIMO) WPT system. By monitoring real-time electromagnetic parameters, the fluctuation and fault of the WPT system can be quickly diagnosed and removed, and the derating operation state can be realized in time.

关键词： wireless power transfer redundancy fault-tolerant control magnetic coupler multi-input multi-output

来源：评论

学校读者我要写书评

暂无评论

Integration of Photovoltaic-Based Transformerless High Step-Up Dual-output-Dual-input Converter with Low Power Losses for Energy Storage Applications

引用

ENERGIES 2022年第15期15卷 5559页

作者： Aljafari, Belqasem Ramu, Senthil Kumar Devarajan, Gunapriya Vairavasundaram, Indragandhi Najran Univ Coll Engn Dept Elect Engn Najran 11001 Saudi Arabia Sri Krishna Coll Technol Autonomous Dept Elect & Elect Engn Coimbatore 641042 Tamil Nadu India Sri Eshwar Coll Engn Dept Elect & Elect Engn Coimbatore 641202 Tamil Nadu India Vellore Inst Technol Sch Elect Engn Vellore 632014 Tamil Nadu India

The synchronous integration of numerous input and output loads is possible with multi-input (MI) and multi-output (MO) DC-DC converters. In this paper, the non-isolated DC-DC converter described, which has a high step-up capability and multiple ports for outputs and inputs for energy storage system (ESS) applications. The voltage level of the converter is changeable. The capacity to provide the large voltage increases with a low duty cycle portion, the ease with which each duty cycle can be controlled, and minimal power losses are all advantages of the proposed design. The proposed system offers advantages for applications requiring energy storage. In the continuous conduction mode (CCM), the operation principles, steady-state evaluation, and extracting of the voltage and current coefficients are performed. The supply sources can be inserted or withdrawn without causing a cross-regulation issue in the proposed converter. Ultimately, the functionality of the proposed structure is examined using simulation and the laboratory prototype that has been implemented. The proposed converter achieved 94.3% efficiency at maximum power. In addition, the proposed converter attained minimum losses with a difference of 28.5 W when compared to a conventional converter.

关键词： multi-input multi-output step-up converter energy storage DC-DC converter

来源：评论

学校读者我要写书评

暂无评论

Phase Index-Based Receive Spatial Modulation PHY Security Against Supervised Pattern Recognition

Phase Index-Based Receive Spatial Modulation PHY Security Ag...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Abushattal, Abdelrahman Arslan, Huseyin Istanbul Medipol Univ Dept Elect & Elect Engn Istanbul Turkey Univ S Florida Dept Elect Engn Tampa FL USA

ISBN: (纸本)9781728195056

Receive Spatial Modulation (RSM) uses the index of the receive antenna to convey additional information bits, which reduces the receiver complexity and improves spectral efficiency. Additionally, it provides inherent physical layer security using the Zero-forcing (ZF) precoding technique. However, the channel becomes vulnerable to eavesdropper (Eve) if the channel impulse response is assumed to be time-invariant or stationary through coherent block intervals. In this paper, a physical layer secure scheme is proposed based on phase index RSM to combat eaves-droppers that use k-nearest neighbors (KNN) supervised pattern recognition. The average bit error rate (BER) performance shows the ability of the proposed scheme to provide a suitable level of security while degrading the average BER performance of Eve.

关键词： multi-input multi-output k-nearest neighbors (KNN) Zero-forcing precoding supervised pattern recognition receive spatial modulation physical-layer security supervised Pattern Recognition

来源：评论

学校读者我要写书评

暂无评论

Octagonal polarization-maintaining supermode fiber for mode division multiplexing system

引用

OPTICS COMMUNICATIONS 2022年 510卷 127897-127897页

作者： Chen, Hongyao Chen, Yijin Wang, Jianping Lu, Huimin Feng, Lifang Song, Weijun Univ Sci & Technol Beijing Shunde Grad Sch 2 Daliang Zhihui Rd Foshan 528300 Peoples R China Univ Sci & Technol Beijing 30 Xuanyuan Rd Beijing 100083 Peoples R China

We present a new type of polarization-maintaining supermode fiber which can separate adjacent modes from each other. The proposed polarization-maintaining supermode fiber features an octagonal core composed of multiple high-refractive-index circular holes. By using high refractive index cores and setting the angle subtly between the cores, the fiber proposed can support 22 modes with different polarization states under two parameters in the entire C-band. Through the finite element method simulation, we conducted simulation study to analyze the influence of the angle between the cores and the core diameter on the performance of the optical fiber. In addition, we analyzed effective refractive index difference (d(neff)) and effective modal area (A(eff)) of the fiber for each characteristic mode. The differential mode delay (DMD) under different cores angle is also calculated. Numerical results present that the minimum A neff of the octagonal polarization-maintaining supermode fiber in the entire C-band under the two parameters is greater than 1.1 x 10(-4). It was measured to have good tolerance under the condition of unsatisfactory structure. These results indicate that the proposed fiber is superior candidate for improving the optical transmission capacity in the transmission of the mode division multiplexing system.

关键词： Supermode fiber Mode division multiplexing multi-input multi-output

来源：评论

学校读者我要写书评

暂无评论

Cooperative DF Protocol for MIMO Systems Using One-Bit ADCs

引用

SENSORS 2022年第20期22卷 7843页

作者： Kim, Tae-Kyoung Gachon Univ Dept Elect Engn Seongnam 13120 South Korea

This study considers a detection scheme for cooperative multi-input-multi-output (MIMO) systems using one-bit analog-to-digital converters (ADCs) in a decode-and-forward (DF) relay protocol. The use of one-bit ADCs is a promising technique for reducing the power consumption, which is necessary for supporting future wireless systems comprising a large number of antennas. However, the use of a large number of antennas remains still limited to mobile devices owing to their size. Cooperative communication using a DF relay can resolve this limitation;however, detection errors at the relay make it difficult to employ cooperative communication directly. This difficulty is more severe in a MIMO system using one-bit ADCs due to its nonlinear nature. To efficiently address the difficulty, this paper proposes a detection scheme that mitigates the error propagation effect. The upper bound of the pairwise error probability (PEP) of one-bit ADCs is first derived in a weighted Hamming distance form. Then, using the derived PEP, the proposed detection for the DF relay protocol is derived as a single weighted Hamming distance. Finally, the complexity of the proposed detection is analyzed in terms of real multiplications. The simulation results show that the proposed detection method efficiently mitigates the error propagation effect but has a relatively low level of complexity when compared to conventional detection methods.

关键词： multi-input multi-output cooperative communication pairwise error probability one-bit ADCs

来源：评论

学校读者我要写书评

暂无评论

MIMO modeling and multi-loop control based on neural network for municipal solid waste incineration

引用

CONTROL ENGINEERING PRACTICE 2022年 127卷

作者： Ding, Haixu Tang, Jian Qiao, Junfei Beijing Univ Technol Fac Informat Technol Beijing 100124 Peoples R China Beijing Lab Smart Environm Protect Beijing 100124 Peoples R China

The Municipal solid wastes incineration (MSWI) process with complex mechanism and strong nonlinearity is an important part of resource cycle. It is a challenge to design its multivariable controlled object model and control strategy. To solve this problem, a multi-input multi-output (MIMO) data-driven model and a multi-loop PID controller are proposed in this paper. Firstly, a feature selection method based on Pearson correlation coefficient (PCC) and expert knowledge is used to analyze the relationship between the manipulated variable and the controlled variable of MSWI process. Secondly, a MIMO Takagi-Sugeno fuzzy neural network (TSFNN) based on multi-task learning (MTL) is designed to construct the multivariable controlled object model. Thirdly, a multi-loop PID controller based on quasi-diagonal recurrent neural network (QDRNN) is constructed, which has self-feedback channel and interconnection channel, and can adjust the control parameters automatically. Next, the stability of control strategy is proved by Lyapunov second method. Finally, the modeling effect and control performance are confirmed on the simulation experiments based on the real MSWI process data.

关键词： Municipal solid wastes incineration Quasi-diagonal recurrent neural network multi-loop PID controller multi-input multi-output multi-task learning

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：