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Records with Subject: Process Control
Showing records 1 to 25 of 56. [First] Page: 1 2 3 Last
The Chaotic-Based Control of Three-Port Isolated Bidirectional DC/DC Converters for Electric and Hybrid Vehicles
Zheng Wang, Bochen Liu, Yue Zhang, Ming Cheng, Kai Chu, Liang Xu
November 16, 2018 (v1)
Keywords: bidirectional DC/DC converter, chaotic modulation, electric and hybrid vehicles, Energy Conversion, shifted-phase angle based control
Three-port isolated (TPI) bidirectional DC/DC converters have three energy ports and offer advantages of large voltage gain, galvanic isolation ability and high power density. For this reason this kind of converters are suitable to connect different energy sources and loads in electric and hybrid vehicles. The purpose of this paper is to propose chaotic modulation and the related control scheme for TPI bidirectional DC/DC converters, in such a way that the switching harmonic peaks can be suppressed in spectrum and the conducted electromagnetic interference (EMI) is reduced. Two chaotic modulation strategies, namely the continuously chaotic modulation and the discretely chaotic modulation are presented. These two chaotic modulation strategies are applied for TPI bidirectional DC/DC converters with shifted-phase angle based control and phase-shifted PWM control. Both simulation and experiments are given to verify the validity of the proposed chaotic modulation-based control schemes.
An Innovative Control Strategy to Improve the Fault Ride-Through Capability of DFIGs Based on Wind Energy Conversion Systems
Vandai Le, Xinran Li, Yong Li, Tran Le Thang Dong, Caoquyen Le
November 16, 2018 (v1)
Keywords: doubly fed induction generator (DFIG), low voltage ride-through (LVRT), passivity-based control (PBC), wind energy conversion systems (WECS)
An innovative control strategy is proposed for enhancing the low voltage ride-through (LVRT) capability of a doubly fed induction generator based on wind energy conversion systems (DFIG-WECS). Within the proposed control method, the current control loops of the rotor side converter (RSC) are developed based on passivity theory. The control scheme for the grid side converter (GSC) is designed based on a two-term approach to keep the DC-link voltage close to a given value. The first term based on the maximal voltage of GSC is introduced in the GSC control loops as a reference reactive current. The second one reflecting the instantaneous unbalanced power flow between the RSC and GSC is also introduced in the GSC control loops as a disturbance considering the instantaneous power of the grid filter to compensate the instantaneous rotor power. The effectiveness of the proposed control strategy is verified via time domain simulation of a 2.0 MW-575 V DFIG-WECS using PSCAD/EMTP. Simulation res... [more]
HyThSoft V. 2.0
Francisco Sanchez Careaga
November 2, 2018 (v1)
Keywords: Heat Water Treatment, LabWindows CVI, Process Control
HyThSoft, was developed as a powerful tool to consent with the ”WORK PLAN FOR THE MEXICAN MANGO TREATMENT AND PRECLEARENCE PROGRAM” developed jointly by the United States Department of Agriculture, Animal and Plant Health Inspection Service, International Services (USDA/APHIS) and the Secretaria de Agricultura Ganadería y Desarrollo Rural Pesca y Alimentación (SAGARPA) and with norm NOM-075-FITO-1997. This software is designed to take temperature signals and control up to 6 treatment tanks. The software also contains logical functions which facilitate the work of the exporters and USDA/APHIS personal. Although this software was developed for treatment tanks that have each one, an independent boiler, it can also be use with a single boiler for all the tanks (dependent equipment), just by changing its operational parameters.
Diesel-Minimal Combustion Control of a Natural Gas-Diesel Engine
Florian Zurbriggen, Richard Hutter, Christopher Onder
October 23, 2018 (v1)
Keywords: closed-loop control, combustion control, Diesel, dual fuel, engine control, extremum seeking, internal combustion engine, Natural Gas, Optimization
This paper investigates the combustion phasing control of natural gas-diesel engines. In this study, the combustion phasing is influenced by manipulating the start and the duration of the diesel injection. Instead of using both degrees of freedom to control the center of combustion only, we propose a method that simultaneously controls the combustion phasing and minimizes the amount of diesel used. Minimizing the amount of diesel while keeping the center of combustion at a constant value is formulated as an optimization problem with an equality constraint. A combination of feedback control and extremum seeking is used to solve this optimization problem online. The necessity to separate the different time scales is discussed and a structure is proposed that facilitates this separation for this specific example. The proposed method is validated by experiments on a test bench.
Enhanced Predictive Current Control of Three-Phase Grid-Tied Reversible Converters with Improved Switching Patterns
Zhanfeng Song, Yanjun Tian, Zhe Chen, Yanting Hu
October 23, 2018 (v1)
Keywords: bidirectional power flow, cost function minimization, improved switching pattern, predictive control, three-phase grid-tied converters
A predictive current control strategy can realize flexible regulation of three-phase grid-tied converters based on system behaviour prediction and cost function minimization. However, when the predictive current control strategy with conventional switching patterns is adopted, the predicted duration time for voltage vectors turns out to be negative in some cases, especially under the conditions of bidirectional power flows and transient situations, leading to system performance deteriorations. This paper aims to clarify the real reason for this phenomenon under bidirectional power flows, i.e., rectifier mode and inverter mode, and, furthermore, seeks to propose effective solutions. A detailed analysis of instantaneous current variations under different conditions was conducted. An enhanced predictive current control strategy with improved switching patterns was then proposed. An experimental platform was built based on a commercial converter produced by Danfoss, and moreover, relative... [more]
Model-Free Coordinated Control for MHTGR-Based Nuclear Steam Supply Systems
Zhe Dong
October 23, 2018 (v1)
Keywords: coordinated control, MHTGR, model-free, nuclear power plant, stability
The modular high temperature gas-cooled reactor (MHTGR) is a typical small modular reactor (SMR) that offers simpler, standardized and safer modular design by being factory built, requiring smaller initial capital investment, and having a shorter construction period. Thanks to its small size, the MHTGRs could be beneficial in providing electric power to remote areas that are deficient in transmission or distribution and in generating local power for large population centers. Based on the multi-modular operation scheme, the inherent safety feature of the MHTGRs can be applicable to large nuclear plants of any desired power rating. The MHTGR-based nuclear steam supplying system (NSSS) is constituted by an MHTGR, a side-by-side arranged helical-coil once-through steam generator (OTSG) and some connecting pipes. Due to the side-by-side arrangement, there is a tight coupling effect between the MHTGR and OTSG. Moreover, there always exists the parameter perturbation of the NSSSs. Thus, it is... [more]
Optimal Coordinated Control of Power Extraction in LES of a Wind Farm with Entrance Effects
Jay P. Goit, Wim Munters, Johan Meyers
October 23, 2018 (v1)
Keywords: adjoints, large eddy simulations, Optimization, turbulent boundary layers, wind farm, wind farm control
We investigate the use of optimal coordinated control techniques in large eddy simulations of wind farm boundary layer interaction with the aim of increasing the total energy extraction in wind farms. The individual wind turbines are considered as flow actuators, and their energy extraction is dynamically regulated in time, so as to optimally influence the flow field. We extend earlier work on wind farm optimal control in the fully-developed regime (Goit and Meyers 2015, J. Fluid Mech. 768, 5⁻50) to a ‘finite’ wind farm case, in which entrance effects play an important role. For the optimal control, a receding horizon framework is employed in which turbine thrust coefficients are optimized in time and per turbine. Optimization is performed with a conjugate gradient method, where gradients of the cost functional are obtained using adjoint large eddy simulations. Overall, the energy extraction is increased 7% by the optimal control. This increase in energy extraction is related to faster... [more]
Performance Characteristics of a Modularized and Integrated PTC Heating System for an Electric Vehicle
Yoon Hyuk Shin, Seungkyu Sim, Sung Chul Kim
October 23, 2018 (v1)
Keywords: heating power density, high voltage, performance characteristics, PTC heating system, weight reduction
A modularized positive temperature coefficient heating system has controller-integrated heater modules. Such a heating system that uses a high-voltage power of 330 V was developed in the present study for use in electric vehicles. Four heater modules and one controller with an input power of 5.6 kW were integrated in the modularized system, which was designed for improved heating power density and light weight compared to the conventional heating system, in which the controller is separated. We experimentally investigated the performance characteristics, namely, the heating capacity, energy efficiency, and pressure drop, of a prototype of the developed heating system and found it to have satisfactory performance. The findings of this study will contribute to the development of heating systems for electric vehicles.
A New Fast Peak Current Controller for Transient Voltage Faults for Power Converters
Jesús Muñoz-Cruzado-Alba, Javier Villegas-Núñez, José Alberto Vite-Frías, Juan Manuel Carrasco Solís
October 22, 2018 (v1)
Keywords: dip voltage, distributed generators (DGs), fast peak current control (FPCC), phase-jump ride through (PJRT), photo-voltaic (PV) systems, voltage ride through (VRT)
Power converters are the basic unit for the transient voltage fault ride through capability for most renewable distributed generators (DGs). When a transient fault happens, the grid voltage will drop suddenly and probably will also suffer a phase-jump event as well. State-of-the-art voltage fault control techniques regulate the current injected during the grid fault. However, the beginning of the fault could be too fast for the inner current control loops of the inverter, and transient over-current would be expected. In order to avoid the excessive peak current of the methods presented in the literature, a new fast peak current control (FPCC) technique is proposed. Controlling the peak current magnitude avoids undesirable disconnection of the distributed generator in a fault state and improves the life expectancy of the converter. Experimental and simulation tests with high power converters provide the detailed behaviour of the method with excellent results.
Side Stream Control in Semicontinuous Distillation
Pranav Bhaswanth Madabhushi, Thomas Adams II
October 18, 2018 (v1)
Keywords: dynamic optimization, dynamical system analysis, Semicontinuous Distillation, side stream control
The idea to reduce cycle time (𝑇), by controlling the side stream flow rate using a feedforward control model -- the ideal side draw recovery arrangement (ISR) -- was standard in most semicontinuous distillation studies. However, its effect, particularly on ‘𝑇’ and more broadly on the system dynamics, was not clearly understood. In the current study, we compare the performance of using a modified form of ISR model with the status quo, based on the criteria, 𝑇 and separating cost (SC) on different case studies. Results show that the modified control model performed better with a 10-20% reduction in SC while maintaining product purities. Furthermore, the side stream flow rate trajectory that minimizes SC was found by using dynamic optimization and it did not differ a lot from the trajectory generated by the modified control model. The improvement in SC was at most 2%.
Mitigation of DC Components Using Adaptive BP-PID Control in Transformless Three-Phase Grid-Connected Inverters
Long Bo, Lijung Huang, Yufei Dai, Youliang Lu, Kil To Chong
October 4, 2018 (v1)
Keywords: adaptive back-propagation, dc component, grid-connected inverter, neural network, power quality
Transformerless grid-connected inverters, due to their advantages of high efficiency, small volume and light weight, have been the subject of more research and interest in recent years. Due to the asymmetrical driving signal in pulse width modulation (PWM) caused by time-delay, zero-drift of the current sensors and imparities of the power transistors, output of the grid current contains dc component. As a result, power quality of the grid is degraded. In this paper, a dc (direct current) component suppression scheme with adaptive back-propagation (BP) neural network proportional-integral-differential (PID) control is proposed for dc component minimization. Moreover, sliding-window-double-iteration-method (SWDIM) is utilized for fast dc component extraction. Compared with the conventional method, the proposed scheme shows better performance, and the dc component can be attenuated to be within 0.5% of the rated current.
Comprehensive Design and Analysis of a State-Feedback Controller for a Dynamic Voltage Restorer
Javier Roldán-Pérez, Aurelio García-Cerrada, Alberto Rodríguez-Cabero, Juan Luis Zamora-Macho
October 4, 2018 (v1)
Keywords: AC-DC power converters, discrete-time control systems, dynamic voltage restorer (DVR), state-feedback controller, voltage sags
Voltage sags result in unwanted operation stops and large economical losses in industrial applications. A dynamic voltage restorer (DVR) is a power-electronics-based device conceived to protect high-power installations against these events. However, the design of a DVR control system is not straightforward and it has some peculiarities. First of all, a DVR includes a resonant (LC) connection filter with a lightly damped resonance. Secondly, the control system of a DVR should work properly regardless of the type of load, which can be linear or non-linear, to be protected. In this paper, a digital state-feedback (SF) controller for a DVR is proposed to address these issues. The design and features of the SF controller are studied in detail. Two pole-placement alternatives are discussed and the system robustness is tested under variations in the system parameters. Furthermore, implementation aspects such as discretization not commonly addressed in the literature are described. The control... [more]
Low Cost Position Controller for Exhaust Gas Recirculation Valve System
Habib Bhuiyan, Jung-Hyo Lee
September 21, 2018 (v1)
Keywords: automotive application, exhaust gas recirculation (EGR) valve system, position control, static friction
This paper proposes a position control method for a low-cost exhaust gas recirculation (EGR) valve system for automotive applications. Generally, position control systems used in automotive applications have many restrictions, such as cost and space. The mechanical structure of the actuator causes high friction and large differences between static friction and coulomb friction. When this large friction difference occurs, the position control vibrates when the controller uses a conventional linear controller such as the P or PI controller. In this paper, we introduce an inexpensive position control method that can be applied under the high-difference-friction mechanical systems. The proposed method is verified through the use of experiments by comparing it with the results obtained when using a conventional control system.
Lighting Control Including Daylight and Energy Efficiency Improvements Analysis
Aniela Kaminska, Andrzej Ożadowicz
September 21, 2018 (v1)
Keywords: building automation systems, building energy efficiency, daytime lighting, EN 15232 standard, lighting control systems
Energy used for lighting is one of the major components of total energy consumption in buildings. Nowadays, buildings have a great potential to reduce their energy consumption, but to achieve this purpose additional efforts are indispensable. In this study, the need for energy savings evaluation before the implementation of lighting control algorithms for a specified building is highlighted. Therefore, experimental tests have been carried out in a university building with laboratories and other rooms, equipped with KNX building automation system. A dimmable control strategy has been investigated, dependent on daylight illuminance. Moreover, a relationship between external and internal daylight illuminance levels has been evaluated as well. Based on the experimental results, the authors proposed a method for the rough estimation of electrical energy savings. Since, according to the EN 15232 standard, Building Automation and Control Systems (BACS) play an important role in buildings’ ene... [more]
On Energy Management Control of a PV-Diesel-ESS Based Microgrid in a Stand-Alone Context
Ahmed Belila, Mohamed Benbouzid, El-Madjid Berkouk, Yassine Amirat
September 21, 2018 (v1)
Keywords: diesel generator, energy management control, energy storage system, hybrid system, photovoltaic generator, power converters
This paper deals with the energy management control of a PV-Diesel-ESS-based microgrid in a stand-alone context. In terms of control, an Isolated Mode Control (IMC) strategy based on a resonant regulator is proposed. In Parallel Mode Control (PMC) conditions, the diesel generator (DG) is controlled to operate at its nominal power. In this context, a supervisory algorithm optimizing the power flow between the microgrid’s various components ensures switching between the two modes for different possible scenarios. To prove the effectiveness of the proposed control strategies, the energy management control (EMC) is tested first using a standard state of charge (SOC) profile emulating the microgrid different states. Then real data are used to simulate the load and solar radiations. An experimental validation on a reduced scale test bench is carried out to prove the feasibility and the effectiveness of the proposed energy management control strategies.
Experimental Study on the Performance of Controllers for the Hydrogen Gas Production Demanded by an Internal Combustion Engine
Marisol Cervantes-Bobadilla, Ricardo Fabricio Escobar-Jiménez, José Francisco Gómez-Aguilar, Jarniel García-Morales, Víctor Hugo Olivares-Peregrino
September 21, 2018 (v1)
Keywords: digital PID, hydrogen production control, Model Predictive Control
This work presents the design and application of two control techniques—a model predictive control (MPC) and a proportional integral derivative control (PID), both in combination with a multilayer perceptron neural network—to produce hydrogen gas on-demand, in order to use it as an additive in a spark ignition internal combustion engine. For the design of the controllers, a control-oriented model, identified with the Hammerstein technique, was used. For the implementation of both controllers, only 1% of the overall air entering through the throttle valve reacted with hydrogen gas, allowing maintenance of the hydrogen⁻air stoichiometric ratio at 34.3 and the air⁻gasoline ratio at 14.6. Experimental results showed that the average settling time of the MPC controller was 1 s faster than the settling time of the PID controller. Additionally, MPC presented better reference tracking, error rates and standard deviation of 1.03 × 10 − 7 and 1.06 × 10 − 14 , and had a gre... [more]
Modeling and Parameter Design of Voltage-Controlled Inverters Based on Discrete Control
Ningbo Dong, Huan Yang, Junfei Han, Rongxiang Zhao
September 21, 2018 (v1)
Keywords: discrete control, optimal design, parameter design, voltage-controlled inverter
Grid-connected inverters are widely used to interface renewable energy and energy storage resources into the grid. Voltage-controlled inverters have attracted more and more attention due to their grid-friendly characteristics. The mathematical models of the voltage and current loops are developed in this paper, considering especially the discrete control delay caused by calculation and modulation. In order to suppress the resonance peak in the current loop, the frequency characteristics of the current loop are analyzed in detail. The optimum design flow of the current controller and voltage controller parameters are presented based on numerical analysis, and the stability, dynamic performance and the resonance peak suppression in voltage loop are also considered. Finally, the validity of the mathematical model and the effectiveness of the controller parameters design method are verified by simulation and experimental results.
An Improved Multi-Timescale Coordinated Control Strategy for Stand-Alone Microgrid with Hybrid Energy Storage System
Jingfeng Chen, Ping Yang, Jiajun Peng, Yuqi Huang, Yaosheng Chen, Zhiji Zeng
September 21, 2018 (v1)
Keywords: coordinated control, hybrid energy storage, multi-time scale, stand-alone microgrid
A scientific and effective coordinated control strategy is crucial to the safe and economic operation of a microgrid (MG). With the continuous improvement of the renewable energy source (RES) penetration rate in MG, the randomness and intermittency of its output lead to the increasing regulation pressure of the conventional controllable units, the increase of the operating risk of MG and the difficulty in improving the operational economy. To solve the mentioned problems and take advantage of hybrid energy storage system (HESS), this study proposes a multi-time scale coordinated control scheme of “day-ahead optimization (DAO) + intraday rolling (IDR) + quasi-real-time correction (QRTC) + real-time coordinated control (RTCC).„ Considering the shortcomings of existing low prediction accuracy of distributed RES and loads, the soft constraints such as unit commitment scheduling errors and load switching scheduling errors are introduced in the intraday rolling model, allowing the correction... [more]
A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control
Ming Li, Xing Zhang, Wei Zhao
September 21, 2018 (v1)
Keywords: current source mode (CSM), distributed generations, grid impedance, grid-connected inverter, multi-inverter system, voltage source mode (VSM), weak grid
Due to the increasing penetration of distributed generations (DGS) and non-negligible grid impedance, the instability problem of the multi-inverter system operating in current source mode (CSM) is becoming serious. In this paper, a closed-loop transfer function model of such a multi-inverter system is established, by which it is concluded that output current resonance will occur with the increase in the grid impedance. In order to address this problem, this paper presents a novel dual-mode control scheme of multiple inverters: one inverter operating in CSM will be alternated into voltage source mode (VSM) if the grid impedance is high. It is theoretically proved that the coupling between the inverters and the resonance in the output current can be suppressed effectively with the proposed scheme. Finally, the validity of the proposed theory is demonstrated by extensive simulations and experiments.
Data-Driven Predictive Control Applied to Gear Shifting for Heavy-Duty Vehicles
Xinxin Zhao, Zhijun Li
September 21, 2018 (v1)
Keywords: data-driven control, Model Predictive Control, shift control, subspace identification
In this paper, the data-driven predictive control method is applied to the clutch speed tracking control for the inertial phase of the shift process. While the clutch speed difference changes according to the predetermined trajectory, the purpose of improving the shift quality is achieved. The data-driven predictive control is implemented by combining the subspace identification with the model predictive control. Firstly, the predictive factors are constructed from the input and output data of the shift process via subspace identification, and then the factors are applied to a prediction equation. Secondly, an optimization function is deduced by taking the tracking error and the increments of inputs into accounts. Finally, the optimal solutions are solved through quadratic programming algorithm in Matlab software, and the future inputs of the system are obtained. The control algorithm is applied to the upshift process of an automatic transmission, the simulation results show that the a... [more]
Optimal P-Q Control of Grid-Connected Inverters in a Microgrid Based on Adaptive Population Extremal Optimization
Min-Rong Chen, Huan Wang, Guo-Qiang Zeng, Yu-Xing Dai, Da-Qiang Bi
September 21, 2018 (v1)
Keywords: design optimization, evolutionary algorithms, extremal optimization, grid-connected inverter, power control
The optimal P-Q control issue of the active and reactive power for a microgrid in the grid-connected mode has attracted increasing interests recently. In this paper, an optimal active and reactive power control is developed for a three-phase grid-connected inverter in a microgrid by using an adaptive population-based extremal optimization algorithm (APEO). Firstly, the optimal P-Q control issue of grid-connected inverters in a microgrid is formulated as a constrained optimization problem, where six parameters of three decoupled PI controllers are real-coded as the decision variables, and the integral time absolute error (ITAE) between the output and referenced active power and the ITAE between the output and referenced reactive power are weighted as the objective function. Then, an effective and efficient APEO algorithm with an adaptive mutation operation is proposed for solving this constrained optimization problem. The simulation and experiments for a 3 kW three-phase grid-connected... [more]
MPPT and SPPT Control for PV-Connected Inverters Using Digital Adaptive Hysteresis Current Control
Triet Nguyen-Van, Rikiya Abe, Kenji Tanaka
September 21, 2018 (v1)
Keywords: adaptive hysteresis current control, MPPT, PV-connected inverter, SPPT
Most PV systems are usually controlled by a Maximum Power Point Tracking (MPPT) algorithm to maximize the generated electrical power. However, the maximum power is often unstable and depends on the solar irradiance and temperature. This makes it difficult to control the power grid supply-demand balance due to fluctuations caused by the increase of renewable and variable PV systems. This paper proposes a new control algorithm for a PV-connected inverter called Specified Power Point Tracking (SPPT) control in addition to the conventional Maximum Power Point Tracking (MPPT) control. The PV system is controlled to generate the maximum power or a specified power depending on the electricity transactions comes from the electricity trading system. A high-speed FPGA-based digital adaptive hysteresis current control method, which has fast and stable response and simple structure comparing with the popular Sine-triangle Pulse Width Modulation (SPWM) method, is proposed to implement the MPPT and... [more]
High Efficiency and Power Tracking Method for Wireless Charging System Based on Phase-Shift Control
Vladimir Kindl, Martin Zavrel, Pavel Drabek, Tomas Kavalir
September 21, 2018 (v1)
Keywords: efficiency, phase-shift control, resonant coupling, shielding, wireless power transfer
The paper presents optimal operating point tracking algorithm for wireless charging system using identical coupling coils providing us to meet simultaneously high efficiency and high transmitted power under varied load and detuning conditions. The proposed method is suitable either for purely resistive load or battery load and it is based on phase-shift control between the primary and the secondary voltage. The paper also gives an intuitive mathematical description of the key control idea and demonstrates its operational abilities. The proposed algorithm is finally implemented into digital signal processor (DSP) and tested on 4 kW laboratory prototype of shielded wireless power transfer system.
An LQR-Based Controller Design for an LCL-Filtered Grid-Connected Inverter in Discrete-Time State-Space under Distorted Grid Environment
Thuy Vi Tran, Seung-Jin Yoon, Kyeong-Hwa Kim
September 21, 2018 (v1)
Keywords: digital signal processor (DSP) TMS320F28335, distorted grid, grid-connected inverter, internal model, LCL filter, linear quadratic regulator
In order to alleviate the negative impacts of harmonically distorted grid conditions on inverters, this paper presents a linear quadratic regulator (LQR)-based current control design for an inductive-capacitive-inductive (LCL)-filtered grid-connected inverter. The proposed control scheme is constructed based on the internal model (IM) principle in which a full-state feedback controller is used for the purpose of stabilization and the integral terms as well as resonant terms are augmented into a control structure for the reference tracking and harmonic compensation, respectively. Additionally, the proposed scheme is implemented in the synchronous reference frame (SRF) to take advantage of the simultaneous compensation for both the negative and positive sequence harmonics by one resonant term. Since this leads to the decrease of necessary resonant terms by half, the computation effort of the controller can be reduced. With regard to the full-state feedback control approach for the LCL-fi... [more]
A Fractional Order Power System Stabilizer Applied on a Small-Scale Generation System
Florindo A. de C. Ayres Junior, Carlos T. da Costa Junior, Renan L. P. de Medeiros, Walter Barra Junior, Cleonor C. das Neves, Marcelo K. Lenzi, Gabriela de M. Veroneze
September 21, 2018 (v1)
Keywords: digital robust control, fractional order power systems stabilizers, power systems stabilizers
In this paper, a Fractional Order Power System controller (FOPSS) is designed, and its performance and robustness are experimentally evaluated by tests in a 10 kVA laboratory scale power system. The FOPSS design methodology is based on the tuning of an additional design variable, namely the fractional order of the controller transfer function. This design variable is tuned aiming to obtain a tradeoff between satisfactory damping of dominant oscillating mode and improved closed-loop system robustness. For controller synthesis, transfer function models were estimated from data collected at selected operating points and subsequently applied for the controller design and for obtaining upper bounds estimates on the operating-point depends on plant uncertainties. The experimental results show that the FOPPS was able to obtain a robust performance for the considered set of the power system operating conditions.
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