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multi-loop control strategy of a solid oxide fuel cell and micro gas turbine hybrid system

JOURNAL OF POWER SOURCES 2011年第20期196卷 8444-8449页

作者： Wu, Xiao-Juan Zhu, Xin-Jian Univ Elect Sci & Technol China Sch Automat Chengdu 610054 Peoples R China Shanghai Jiao Tong Univ Inst Fuel Cell Shanghai 200030 Peoples R China

Solid oxide fuel cell and micro gas turbine (SOFC/MGT) hybrid system is a promising distributed power technology. In order to ensure the system safe operation as well as long lifetime of the fuel cell, an effective control manner is expected to regulate the temperature and fuel utilization at the desired level. and track the desired power output. Thus, a multi-loop control strategy for the hybrid system is investigated in this paper. A mathematical model for the SOFC/MGT hybrid system is built firstly. Based on the mathematical model, control cycles are introduced and their design is discussed. Part load operation condition is employed to investigate the control strategies for the system. The dynamic modeling and control implementation are realized in the MATLAB/SIMULINK environment, and the simulation results show that it is feasible to build the multi-loop control methods for the SOFC/MGT hybrid system with regard to load disturbances. (C) 2011 Elsevier B.V. All rights reserved.

关键词： Solid oxide fuel cell Micro gas turbine multi-loop control

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Robust decoupling PI controllers for multi-loop control

Robust decoupling PI controllers for multi-loop control

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IEEE Annual Conference on Decision and control

作者： Bruno M. Goncalves Eduardo N. Goncalves Reinaldo M. Palhares Ricardo H. C. Takahashi Department of Electrical Engineering Centro Federal de Educacao Tecnologica de Minas Gerais Department of Electronic Engineering Universidade Federal de Minas Gerais Department of Mathematics Universidade Federal de Minas Gerais

ISBN: (纸本)9781467320658

Very often, the control of multivariable industrial processes is performed using multi-loop architectures, in which several SISO PI or PID controllers are committed to control different channels of the plant. A difficulty with such a strategy arises due to the interaction between the different control loops, which may cause the control action in a loop to give rise to significant disturbances in other loops. This paper presents a new robust PI tuning procedure for multi-loop control systems which aims to decouple the different channels of the multivariable system and to guarantee the tracking response performance and measurement noise attenuation, using a reference model approximation scheme. The control problem is formulated as a non-convex multi-objective optimization problem which is formulated directly in the space of PI controller parameters. Polytopic models represent the system uncertainty. An application example is developed for the control of a quadruple-tank process.

关键词： Robust PI control multi-loop control Decoupling control Polytopic uncertainty control ring PI control decoupling control multiple loop control action DECOUPLING system uncertainties multiple input multiple output systems loops Proportional Integral Derivative control Standing Orders

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A Comparative Study of control Topologies for Single-Phase UPS Inverter System

A Comparative Study of Control Topologies for Single-Phase U...

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Asian Conference on Energy, Power and Transportation Electrification (ACEPT)

作者： Singh, Santosh Kumar Choudhuri, Sumit Ghatak Indian Inst Technol Roorkee Dept Elect Engn Roorkee 247667 Uttarakhand India

ISBN: (纸本)9781538609712

Uninterruptible Power Supplies (UPS) have several closed loop control topologies for control of Voltage Source Inverter (VSI). The topologies vary mainly due to choice of control/feedback variable. This paper attempts to categorize different control topologies and highlights the similarities/differences between them. Further, an analytical study on the basis of steady-state and transient performance, design complexity and cost is also presented. Respective control strategies under different loading conditions have been simulated in MATLAB environment in Discrete Time Frame (DTF) for comparative analysis.

关键词： active damping current mode control multi-loop control single-loop control UPS voltage mode control VSI

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Comparative Evaluation of multi-loop control Schemes for a High-Bandwidth AC Power Source with a Two-Stage LC Output Filter

Comparative Evaluation of Multi-Loop Control Schemes for a H...

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International Conference on Renewable Energy Research and Applications

作者： Patricio Cortes David O. Boillat Hans Ertl Johann W. Kolar Power Electronic Systems Laboratory ETH Zurich Switzerland Vienna University of Technology Austria

ISBN: (纸本)9781467323284

This paper presents a comparative evaluation of four different multi-loop control schemes for a high-bandwidth AC power source. The power source considered in this work is based on a three-level T-type inverter with a two-stage LC output filter. The control schemes evaluated in this paper have an output voltage controller in the outer loop. For the inner control loop the following options are evaluated: capacitor current feedbacks, proportional-integral and proportional inverter output current control in combination with reference voltage and load current feedforward, and first LC stage capacitor voltage and inverter output current feedback. The reference tracking capabilities as well as the power source output impedance are evaluated. Analytical and simulation results are shown to be in very good agreement, and the frequency and step responses for the different control schemes are compared. The results show that a cascaded structure consisting of a proportional-integral controller for the output voltage and a proportional controller for the inverter output current allows to achieve the best dynamic behavior in terms of output voltage control bandwidth and output impedance.

关键词： AC source high-bandwidth two-stage LC filter multi-loop control capacitor current feedback

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Z-Source Active Rectifier for Wind Energy Applications

Z-Source Active Rectifier for Wind Energy Applications

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IEEE AFRICON Conference - Science, Technology and Innovation for Africa

作者： Kala-Konga, C. L. Gitau, M. N. Univ Pretoria Dept Elect Elect & Comp Engn ZA-0002 Pretoria South Africa

ISBN: (纸本)9781538627754

In wind generator applications, generator speed varies with wind speed. In the case of permanent magnet synchronous generators, this translates into voltage magnitude and frequency variations. For such applications, it is advantageous to employ active rectifiers with buck-boost capability to interface the generator to a DC-bus. A PWM active rectifier cascaded with a Z-source DC-DC converter circuit is referred to as a Z-source active rectifier. It is capable of buck-boost operations and this study will demonstrate that it is suited for wind generator applications where wide input voltage variations are common. Further, the study will investigate its ability to reject disturbances when a multi-stage controller is employed. Detailed dynamic models derived using circuit averaging techniques will be employed to design a controller for the PWM-rectifier stage based on the synchronous reference frame. A second controller will be employed to regulate the output of the Z-source DC-DC converter stage.

关键词： Z-source active rectifier variable voltage systems multi-loop control dynamic response

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Load Current Distribution between Parallel Inverters based on Capacitor Voltage control for UPS Applications

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IEEJ JOURNAL OF INDUSTRY APPLICATIONS 2017年第4期6卷 258-267页

作者： Shamseh, Mohammad Bani Yoshino, Teruo Kawamura, Atsuo Yokohama Natl Univ Fac Phys Elect & Comp Engn Kawamura Lab Hodogaya Ku 79-5 Tokiwadai Yokohama Kanagawa 2408501 Japan Toshiba Mitsubishi Elect Ind Syst Corp Power Elect Syst Div 1 Toshiba Cho Fuchu Tokyo 1838511 Japan

Many challenges are encountered when uninterruptible power supply (UPS) modules are operated in parallel to meet the power demand of the load. The circulating current is one prominent example of these challenges that may cause serious damage to equipment. Hence, control algorithms must ensure that the current is shared equally or in proportion to the power ratings of the parallel inverters, while mitigating the circulating current. Another challenge is that all parallel inverters should have equal output voltage, phase, and frequency. This paper proposes a new method to control parallel UPS modules. The method is based on regulating the capacitor voltage of the LCL output filter of each inverter to indirectly control its output current. The method can achieve high accuracy in terms of equal current distribution between the power sources. Simulation and experimental results are presented to verify the theoretical analysis.

关键词： current sharing UPS parallel inverters multi-loop control active damping

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A Novel and Practical multi-loop control Strategy for Photovoltaic Inverters Based on DSP

A Novel and Practical Multi-loop Control Strategy for Photov...

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Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Gong, Ren-Xi Shu, Peng-Fei Xie, Ling-Ling Wei, Jiong-Quan Guangxi Univ Coll Elect Engn Nanning 530004 Peoples R China

ISBN: (纸本)9781424462551

A novel and practical multi-loop control strategy for photovoltaic (PV) inverters is presented. In which the double close-loop control structure of digital PID voltage and current instantaneous value is adopted based on the cross feedback decoupling control and load current feed-forward control. In addition, in order to improve accuracy of output voltage, a closeloop control structure of the output voltage RMS value is utilized. The mathematical model for single-phase full-bridge inverters is established. The operation principle of decoupling control and the control strategy are discussed in details. A 50Hz 1kW prototype with TMS320F2812 DSP as controller is developed to validate the effectiveness of the control strategy.

关键词： photovoltaic inverter digital control multi-loop control cross decoupling control

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Teaching multiloop control of nonlinear system: three tanks case study

Teaching multiloop control of nonlinear system: three tanks ...

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11th IFAC Symposium on Advances in control Education (ACE)

作者： Rosinova, Danica Balko, Peter Puleva, Teofana Slovak Univ Technol Bratislava Inst Automot Mechatron Bratislava Slovakia Tech Univ Sofia Fac Automat Sofia Bulgaria

The paper focuses on teaching advanced MIMO control topics using hydraulic system model. Basic steps of nonlinear MIMO system control design are shown on three tank plant model. After modelling part, comprising nonlinear model based on first principles and its linearization about equilibrium point, two approaches to MIMO system control are demonstrated. The first approach designs a full state feedback PI controller in state space, the second one uses multi-loop approach with individual loop design, overall stability condition is used to detune loop PI controllers for the overall system issues. The results are analysed and compared, important teaching issues are indicated. (C) 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： modelling multi-input multi-output system multi-loop control PI controller nonlinear system robust stability

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Research on the piston precise electromagnetic centering of labyrinth-piston compressor

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 2016年第4期230卷 388-401页

作者： Cheng, Junming Zhang, Meimei Liu, Zhan Feng, Quanke Zeng, Xiangjun Xi An Jiao Tong Univ Sch Energy & Power Xian Peoples R China Xi An Jiao Tong Univ Sch Elect Engn Xian Peoples R China

In labyrinth piston compressor, the precise centering of the piston is the most important prerequisite to realize the labyrinth seal and ensure the compressor running safety. However, the piston suffers very large periodically varying loads caused by the gas force and the inertia force, which lead to the eccentrically running of the piston in cylinder. Under this condition, the leakage of the labyrinth piston compressor will be intensified, and the risk of the friction between piston and cylinder wall will increase. In order to realize the piston precise centering, in this paper, an electromagnetic centering system is introduced including the principle, structure, and application. In order to realize the piston precise electromagnetic centering outside of the cylinder, the through-piston rod is adopted. And the guide bearing can be removed. Thus, the current cantilever structure for the piston centering will be replaced with the simply supporting structure. More importantly, this technology can also be used for the traditional large reciprocating compressor, and thereby, the piston rings, packing and other wearing parts can be removed as well.

关键词： Labyrinth piston compressor centering technology multi-loop control eccentric running electromagnetic centering system

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Application of MEMS Accelerometers and Gyroscopes in Fast Steering Mirror control Systems

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SENSORS 2016年第4期16卷 440页

作者： Tian, Jing Yang, Wenshu Peng, Zhenming Tang, Tao Li, Zhijun Chinese Acad Sci Inst Opt & Elect Chengdu 610209 Peoples R China Univ Elect Sci & Technol China Sch Optoelect Informat Chengdu 610054 Peoples R China Chinese Acad Sci Key Lab Opt Engn Chengdu 610209 Peoples R China Univ Chinese Acad Sci Beijing 100039 Peoples R China

In a charge-coupled device (CCD)-based fast steering mirror (FSM) tracking control system, high control bandwidth is the most effective way to enhance the closed-loop performance. However, the control system usually suffers a great deal from mechanical resonances and time delays induced by the low sampling rate of CCDs. To meet the requirements of high precision and load restriction, fiber-optic gyroscopes (FOGs) are usually used in traditional FSM tracking control systems. In recent years, the MEMS accelerometer and gyroscope are becoming smaller and lighter and their performance have improved gradually, so that they can be used in a fast steering mirror (FSM) to realize the stabilization of the line-of-sight (LOS) of the control system. Therefore, a tentative approach to implement a CCD-based FSM tracking control system, which uses MEMS accelerometers and gyroscopes as feedback components and contains an acceleration loop, a velocity loop and a position loop, is proposed. The disturbance suppression of the proposed method is the product of the error attenuation of the acceleration loop, the velocity loop and the position loop. Extensive experimental results show that the MEMS accelerometers and gyroscopes can act the similar role as the FOG with lower cost for stabilizing the LOS of the FSM tracking control system.

关键词： MEMS accelerometer MEMS gyroscope acceleration feedback control multi-loop control light of sight stabilization

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