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non-linear Synergetic control of UPFC for Efficient Damping of Local and Inter-Area Oscillations

IEEE TRANSACTIONS ON POWER SYSTEMS 2024年第1期39卷 2106-2114页

作者： Afaq, Umer Ali, Farhan Hasan, Ammar Rana, Iftikhar Ahmad Asif, Mansoor Natl Univ Sci & Technol Sch Elect Engn & Comp Sci Islamabad 44000 Pakistan KFUPM Appl Res Ctr Metrol Stand & Testing Dhahran 31261 Saudi Arabia

This paper suggests a novel non-linear synergetic control for a unified power flow controller (UPFC). UPFC is a member of flexible AC transmission system devices, that controls power flow and regulates the voltage by enhancing the transient stability of the power system. UPFC comprises of two voltage source converters (VSCs). Equations of VSC are inherently non-linear. In this paper, we propose a non-linear approach to control the UPFC based on the synergetic control technique. It is simple to implement and valid for a variety of operations. It is also effective in suppressing inter-area oscillations. To verify the effectiveness of the proposed controller, various case studies are simulated and the results are compared with the traditional linear and non-linear controllers.

关键词： Automatic voltage control Power transmission lines Mathematical models Oscillators Power system stability Power conversion Reactive power linear control non-linear control power system PWM synergetic control transient stability UPFC VSC

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A New Robust Digital non-linear control for Power Factor Correction-Arc Welding Applications

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ENERGIES 2021年第4期14卷 991-991页

作者： Bellec, Quentin Le Claire, Jean-Claude Benkhoris, Mohamed Fouad Coulibaly, Peyofougou Univ Nantes IREENA 37 Blvd UnivBP406 F-44602 St Nazaire France GYS Res Dept 1 Rue Croix LandesCS 54159 F-53941 St Berthevin France

A welding power source is commonly assimilated to a non-linear load. Arc welding market being in full growth, the resulting harmonic pollution is becoming an increasingly difficult problem to ignore. Therefore, the main purpose of this work is to define and implement the most suitable solution for power factor correction in a welding power source. Due to the high non-linearity of the electric arc, the current controller used to control grid current need to show high robustness. Consequently, this paper focuses on the digitization of a very robust Phase-Shift Self-Oscillating Current controller (PSSOCC), which only exists in its analog version until then, to carry out this task. After quick descriptions of the entire energy conversion chain and the PSSOCC operation principle, a model of the digital PSSOCC is proposed. Then, the quality and the accuracy of the aforementioned model are evaluated and its operating limits are identified. Afterwards, the behavior of the digital controller is studied within a Power Factor Correction (PFC) regulation for several specific arc welding operating modes. Finally, excellent robustness of this new FPGA-based digital current controller, named DPSSOCC, is confirmed on a three-phase Vienna converter test bench.

关键词： power factor correction arc welding non-linear control robust current controller self-oscillation digital control three phase Vienna converter FPGA

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Application of Modern non-linear control Techniques for the Integration of Compressed Air Energy Storage with Medium and Low Voltage Grid

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ENERGIES 2021年第14期14卷 4097页

作者： Mitra, Sanjib Kumar Karanki, Srinivas Bhaskar King, Marcus Li, Decai Dooner, Mark Kiselychnyk, Oleh Wang, Jihong IIT Bhubaneswar Sch Elect Sci Bhubaneswar 752050 India Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England

Compressed air energy storage is a well-used technology for application in high voltage power systems, but researchers are also investing efforts to minimize the cost of this technology in medium and low voltage power systems. Integration of this energy storage requires a robust control of the power electronic converter to control the power injection due to the dynamic behavior of the system. The conventional linear control design requires a thorough knowledge of the system parameters, but the uncertain disturbances caused by the mechanical properties of the energy storage is neglected in the design and the system fails in presence of such instances. In this paper an adaptive control-based boost converter and sliding mode control-based three phase inverter for a grid integrated compressed air energy storage system of up to 1 kW has been presented that can mitigate any uncertain disturbances in the system without prior knowledge of the system parameters. The experimental results along with the simulation results are also presented to validate the efficiency of the system.

关键词： compressed air energy storage DC-DC converter voltage source inverter non-linear control model reference adaptive control sliding mode control

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Adaptive non-linear control for a Virtual 3D Manipulator

Adaptive Non-linear Control for a Virtual 3D Manipulator

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2020 IEEE Andescon Conference

作者： Ona, Alex Vimos, Victor Benalcazar, Marco Cruz, Patricio J. Escuela Politec Nacl Escuela Formac Tecnologos Quito Ecuador Escuela Politec Nacl Lab Invest Inteligencia Artif & Vis Computac Quito Ecuador Escuela Politec Nacl Dept Automatizac & Control Ind Quito Ecuador

ISBN: (纸本)9781728193656

This work focuses on two main problems in the field of robotic manipulators: modeling and non-linear robust control for trajectory tracking. The kinematic and dynamic model of a three degree of freedom (DoF) commercial manipulator is summarized. Through 3D simulation, the robot is implemented in a virtual environment using Autodesk Inventor and Matlab-Simulink in order to have a robotic computational platform for didactic and research purposes. Using the virtual robot, a non-linear controller is implemented for each joint and the tracking response of the tip to a sinusoidal input is verified. This controller presents a good performance when the manipulator parameters are known with accuracy, so the non-linearities are canceled. However, it is more challenging to consider a real case in which the manipulator holds an object that changes its dynamics. Therefore, an adaptive algorithm is designed and implemented for this case when the cancellation of non-linearities is not exact. This algorithm is based on Lyapunov stability to generate a control law that allows the estimation of the link masses and allowing a better cancellation of non-linearities. This control scheme provides a better performance compared with the case of a non-linear controller but not adaptive.

关键词： Robotic manipulator robot simulation non-linear control calculated torque control adaptive control

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Design of an Observer-Based Architecture and non-linear control Algorithm for Cogging Torque Reduction in Synchronous Motors

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ENERGIES 2020年第8期13卷 2077页

作者： Dini, Pierpaolo Saponara, Sergio Univ Pisa Dipartimento Ingn Informaz Via G Caruso 16 I-56122 Pisa Italy

The problem of cogging torque is due to a magnetic behavior, intrinsic to synchronous machines and due to the presence of permanent magnets themselves. Cogging torque is a significant problem when the servo drive is used for applications where high precision in terms of position control is required. In this paper we present a method of cogging torque reduction by means of a control technique based on mathematical modeling of the cogging phenomenon itself in order to exploit this knowledge directly in the controller design. The mathematical model is inserted in the dynamic model of the synchronous machine in order to exploit the feedback linearization, providing an expression of the control law in which the contribution of the deterministic knowledge of the phenomenon is directly present. The cogging phenomenon physically depends on the angular position of the rotor, as well as the deterministic model we use to define the control vector. This makes it interesting and innovative to determine whether the control algorithm can be inserted within a sensor-less architecture, where rotor position and angular velocity measurements are not available. For this purpose, we present the use of an extended Kalman filter (EKF) in the continuous-time domain, discussing the advantages of an observer design based on a dynamic motor model in three-phase and direct-square axes. Results are presented through very accurate simulation for a trajectory-tracking problem, completing with variational analysis in terms of variation of initial conditions between EKF and motor dynamics, and in terms of parametric variation to verify the robustness of the proposed algorithm. Moreover, a computational analysis based on Simulink Profiler is proposed, which provides some indication for possible implementation on an embedded platform.

关键词： non-linear control feedback linearization cogging torque synchronous permanent magnets motor state observer extended Kalman filter power drive system

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non-linear control for Variable Resistive Bridge Type Fault Current Limiter in AC-DC Systems

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ENERGIES 2019年第4期12卷 713-713页

作者： Alam, Md Shafiul Abido, Mohammad Ali Yousef Hussein, Alaa El-Din King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia Int Islamic Univ Chittagong Dept Elect & Elect Engn Chittagong 4318 Bangladesh

This paper proposes a non-linear control-based variable resistive bridge type fault current limiter (VR-BFCL) as a prospective solution to ease the effect of disturbances on voltage source converter-based high voltage DC (VSC-HVDC) systems. A non-linear controller for VR-BFCL has been developed to insert a variable optimum resistance during the inception of system disturbances in order to limit the fault current. The non-linear controller takes the amount of DC link voltage deviation as its input and provides variable duty to generate a variable effective resistance during faults. The VSC-HVDC system's real and reactive power controllers have been developed based on a current control loop where direct axis and quadrature axis currents are used to control the active and reactive power, respectively. The efficacy of the proposed non-linear control-based VR-BFCL solution has been proved with balanced as well as unbalanced faults. The results confirm that the oscillations in active power and DC link voltage have been significantly reduced by limiting the fault current through the insertion of an optimum effective resistance with the proposed control technique. The real time digital simulator (RTDS) has been used to implement the proposed approach. The performance of the proposed non-linear control based VR-BFCL is compared with that of traditional fixed duty control.

关键词： non-linear control variable resistive bridge type fault current limiter (VR-BFCL) voltage source converter high voltage DC (VSC-HVDC) transient stability voltage fluctuation

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A High-Speed, non-linear control Based Voltage Droop Mitigation Technique for Integrated Voltage Regulators in Modern Microprocessors 34

A High-Speed, Non-Linear Control Based Voltage Droop Mitigat...

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34th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

作者： Masilamani, Sivaraman Raghavan, Arvind Vunnam, Ravi Sankar Makala, Sarath Intel Corp Scalable Performance CPU Dev Grp SDG Hudson MA 01749 USA Intel Corp DDG Hillsboro OR USA

ISBN: (纸本)9781538683309

Modern microprocessors impose stringent constraints on power supply design. Large voltage droops caused by the high output current slew rate (di/dt) requirements of advanced microprocessor features are one of the significant challenges for power supply design. Fully Integrated Voltage Regulator (FIVR) technology introduced in Intel (R) 4th generation Core (TM) processors, features a fast output supply ramp rate by virtue of its small on-die output capacitance. While this provides several benefits, it limits FIVR's ability to handle high-current workloads and can cause large voltage droops, adversely impacting microprocessor performance. This paper presents a novel non-linear control (NLC) based droop mitigation technique that can reduce output voltage droop by 25% for AVX workloads. The NLC loop works in tandem with the main FIVR loop and kicks in only in the event of a voltage droop larger than a programmed threshold.

关键词： Integrated voltage regulators load transient response non-linear control droop mitigation FIVR

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Effect of Different Interval Lengths in a Rolling Horizon MILP Unit Commitment with non-linear control Model for a Small Energy System

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ENERGIES 2019年第6期12卷 1003-1003页

作者： Erichsen, Gerrit Zimmermann, Tobias Kather, Alfons Hamburg Univ Technol Inst Energy Syst Denickestr 15 D-21073 Hamburg Germany

In this paper, a fixed electricity producer park of both a short- and long-term renewable energy storage (e.g., battery, power to gas to power) and a conventional power plant is combined with an increasing amount of installed volatile renewable power. For the sake of simplicity, the grid is designed as a single copper plate with island restrictions and constant demand of 1000 MW;the volatile input is deducted from scaled 15-min input data of German grid operators. A mixed integer linear programming model is implemented to generate an optimised unit commitment (UCO) for various scenarios and configurations using CPLEXA (R) as the problem solver. The resulting unit commitment is input into a non-linear control model (NLC), which tries to match the plan of the UCO as closely as possible. Using the approach of a rolling horizon the result of the NLC is fed back to the interval of the next optimisation run. The problem's objective is set to minimise CO2 emissions of the whole electricity producer park. Different interval lengths are tested with perfect foresight. The results gained with different interval lengths are compared to each other and to a simple heuristic approach. As non-linear control model a characteristic line model is used. The results show that the influence of the interval length is rather small, which leads to the conclusion that realistic forecast lengths of two days can be used to achieve not only a sufficient quality of solutions, but shorter computational times as well.

关键词： mixed integer linear programming unit commitment rolling horizon islands non-linear control MILP models renewable energies long-term storage

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A Novel non-linear control for Three-Phase Five-Level Cascaded H-Bridge Inverter Based Shunt Active Power Filter

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INTERNATIONAL JOURNAL OF EMERGING ELECTRIC POWER SYSTEMS 2018年第5期19卷

作者： Ray, Soumyadeep Gupta, Nitin Gupta, Ram Avtar Malaviya Natl Inst Technol Dept Elect Engn Jaipur Rajasthan India

Cascaded H-Bridge multilevel inverter (CHB-MLI) based shunt active power filter (SAPF) provides a cost-worthy and realistic solution for mitigating current related power quality problems in case of medium-voltage and high-power grid. Mitigation of current harmonic component, reactive power minimization and power factor correction depend on accuracy of control technique applied to the CHB-MLI based SAPF unit. Switching technique dynamics is not considered by most of the researchers while designing control techniques applied to SAPF unit and hence it is assumed linear in order to make system simpler. A limited amount of literature is available which considers the non-linearity of CHB-MLI switching pattern while designing control theory for MLI based SAPF. Therefore, a novel non-linear control is proposed in this paper to enhance system steady-state and dynamic performance. This non-linear control is based on dynamic mathematical modeling of five-level CHB-MLI tied SAPF. Stability of proposed control strategy applied to CHB-MLI based SAPF is rigorously checked by using Lyapunov's direct method. Proportional-Integral controller is used for stabilizing DC-link voltages to its proper reference value. This proposed control exhibits excellent dynamic performance and compensation criteria in comparison to conventional control techniques available in the literature. The effectiveness of the proposed control theory is tested rigorously in MATLAB/Simulink and verified through hardware prototype under steady-state and transient operating conditions. Rigorous analysis from hardware and simulation results confirms that source current waveform is in compliance with IEEE-519 standard defined THD limit. Keywords: cascaded-h-bridge, multilevel inverter, shunt active power filter, non-linear control

关键词： cascaded-h-bridge multilevel inverter shunt active power filter non-linear control

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non-linear control of a hydraulic piezo-valve using a generalised Prandtl-Ishlinskii hysteresis model

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2017年第0期82卷 412-431页

作者： Stefanski, Frederik Minorowicz, Bartosz Persson, Johan Plummer, Andrew Bowen, Chris Poznan Univ Tech Inst Mech Technol Fac Mech Engn & Management Piotrowo St 3 PL-60965 Poznan Poland Univ Bath Dept Mech Engn Ctr Power Transmiss & Mot Control Bath BA2 7AY Avon England

The potential to actuate proportional flow control valves using piezoelectric ceramics or other smart materials has been investigated for a number of years. Although performance advantages compared to electromagnetic actuation have been demonstrated, a major obstacle has proven to be ferroelectric hysteresis, which is typically 20% for a piezoelectric actuator. In this paper, a detailed study of valve control methods incorporating hysteresis compensation is made for the first time. Experimental results are obtained from a novel spool valve actuated by a multi-layer piezoelectric ring bender. A generalised Prandtl-Ishlinskii model, fitted to experimental training data from the prototype valve, is used to model hysteresis empirically. This form of model is analytically invertible and is used to compensate for hysteresis in the prototype valve both open loop, and in several configurations of closed loop real time control system. The closed loop control configurations use PID (Proportional Integral Derivative) control with either the inverse hysteresis model in the forward path or in a command feedforward path. Performance is compared to both open and closed loop control without hysteresis compensation via step and frequency response results. Results show a significant improvement in accuracy and dynamic performance using hysteresis compensation in open loop, but where valve position feedback is available for closed loop control the improvements are smaller, and so conventional PID control may well be sufficient It is concluded that the ability to combine state-of-the-art multi-layer piezoelectric bending actuators with either sophisticated hysteresis compensation or closed loop control provides a route for the creation of a new generation of high performance piezoelectric valves. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Hydraulic valve Piezoelectric actuator non-linear control Hysteresis Generalised Prandtl-Ishlinskii model

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