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Optimal STATCOM Sizing and Placement Using Particle Swarn Optimization

Optimal STATCOM Sizing and Placement Using Particle Swarn Op...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： Y. del Valle J. C. Hernandez G. K. Venayagamoorthy R. G. Harley Department of Electrical and Computer engineering Georgia Institute of Technology Atlanta GA USA Department of Electrical and Computer Engineering Real-Time Power and Intelligent Systems Laboratory University of Missouri-Rolla MO USA

Heuristic approaches are traditionally applied to find the size and location of flexible AC transmission systems (FACTS) devices in a small power system. Nevertheless, more sophisticated methods are required for placing them in a large power network. Recently, the particle swarm optimization (PSO) technique has been applied to solve power engineering optimization problems giving better results than classical methods. This paper shows the application of PSO for optimal sizing and allocation of a static compensator (STATCOM) in a power system. A 45 bus system (part of the Brazilian power network) is used as an example to illustrate the technique. Results show that the PSO is able to find the best solution with statistical significance and a high degree of convergence. A detailed description of the method, results and conclusions are also presented

关键词： Automatic voltage control Power systems Particle swarm optimization Flexible AC transmission systems Power system simulation Evolutionary computation Power engineering Power generation STATCOM Optimization methods

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Synchronous Reference Frame Based Active Filter Current Reference Generation Using Neural Networks

Synchronous Reference Frame Based Active Filter Current Refe...

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Annual Conference of Industrial Electronics Society

作者： Joy Mazumdar Ronald G Harley Ganesh K. Venayagamoorthy School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory University of Missouri Rolla Rolla MO USA

The increased use of nonlinear devices in industry has resulted in direct increase of harmonic distortion in the industrial power system in recent years. The significant harmonics are almost always 5th, 7th, 11th and the 13th with the 5th harmonic being the largest in most instances. Active filter systems have been proposed to mitigate harmonic currents of the industrial loads. The most important requirement for any active filter is the precise detection of the individual harmonic component's amplitude and phase. Fourier transform based techniques provide an excellent method for individual harmonic isolation, but it requires a minimum of two cycles of data for the analysis, does not perform well in the presence of subharmonics which are not integral multiples of the fundamental frequency and most importantly introduces phase shifts. To overcome these difficulties, this paper proposes a multilayer perceptron neural network trained with back-propagation training algorithm to identify the harmonic characteristics of the nonlinear load. The operation principle of the synchronous-reference-frame-based harmonic isolation is discussed. This proposed method is applied to a thyristor controlled DC drive to obtain the accurate amplitude and phase of the dominant harmonics. This technique can be integrated with any active filter control algorithm for reference generation

关键词： Active filters Synchronous generators Neural networks Power system harmonics Power harmonic filters Harmonic distortion Industrial power systems Phase detection Fourier transforms Data analysis

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Intelligent optimal control of excitation and turbine systems in power networks

Intelligent optimal control of excitation and turbine system...

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IEEE General Meeting Power& Energy Society

作者： G.K. Venayagamoorthy R.G. Harley Real-Time Power and Intelligent Systems (RTPIS) Laboratory Department of Electrical and Computer Engineering University of Missouri MO USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

The increasing complexity of the modern power grid highlights the need for advanced modeling and control techniques for effective control of excitation and turbine systems. The crucial factors affecting the modern power systems today is voltage control and system stabilization during small and large disturbances. Simulation studies and real-time laboratory experimental studies carried out are described and the results show the successful control of the power system excitation and turbine systems with adaptive and optimal neurocontrol approaches. Performances of the neurocontrollers are compared with the conventional PI controllers for damping under different operating conditions for small and large disturbances

关键词： Intelligent control Intelligent networks Optimal control Turbines Power system simulation Power system control Power system modeling Power systems Power grids Voltage control

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real-time Implementation of a STATCOM on a Wind Farm Equipped with Doubly Fed Induction Generators

Real-Time Implementation of a STATCOM on a Wind Farm Equippe...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Wei Qiao Ganesh K. Venayagamoorthy Ronald G. Harley School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla Rolla MO USA

Voltage stability is a key issue to achieve the uninterrupted operation of wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. A static synchronous compensator (STATCOM) is applied to a power network which includes a DFIG driven by a wind turbine, for steady state voltage regulation and transient voltage stability support. The control schemes of the DFIG rotor-side converter, grid-side converter and the STATCOM are suitably designed and coordinated. The system is implemented in real-time on a real-time Digital Simulator (RTDSreg). Results show that the STATCOM improves the transient voltage stability and therefore helps the wind turbine generator system to remain in service during grid faults

关键词： Automatic voltage control Wind farms Induction generators Stability Wind turbines real time systems Steady-state Voltage control Rotors Mesh generation

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Intelligent Integration of a Wind Farm to an Utility Power Network with Improved Voltage Stability

Intelligent Integration of a Wind Farm to an Utility Power N...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Vamsi K. Polisetty Sandhya R. Jetti Ganesh K. Venayagamoorthy Ronald G. Harley Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla Rolla MO USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

The increasing effect of wind energy generation will influence the dynamic behavior of power systems by interacting with conventional generation and loads. Due to the inherent characteristics of wind turbines, non-uniform power production causes variations in system voltage and frequency. Therefore, a wind farm requires high reactive power compensation. Flexible AC transmission systems (FACTS) devices such as SVCs inject reactive power into the system which helps in maintaining a better voltage profile. This paper presents the design of a linear and a nonlinear coordinating controller between a SVC and the wind farm inverter at the point of interconnection. The performances of the coordinating controllers are evaluated on the IEEE 12 bus FACTS benchmark power system where one of the generators is replaced by a wind farm supplying 300 MW. Results are presented to show that the voltage stability of the entire power system during small and large disturbances is improved

关键词： Intelligent networks Wind farms Voltage Power system stability Wind energy generation Power system interconnection Power system dynamics Power generation Reactive power Flexible AC transmission systems

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Hierarchical Control Scheme for two Static Compensators in the Brazilian 45-Bus Power System

Hierarchical Control Scheme for two Static Compensators in t...

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IEEE PES Power systems Conference and Exposition, PSCE

作者： S. Mohagheghi Y. Del Valle G.K. Venayagamoorthy R.G. Harley Intelligent Power Infrastructure Consortium IPIC School of Electrical and computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

This paper presents a conventional external scheme for controlling two neighboring static compensators (STATCOMs) from a supervisory level. The two STATCOMs are connected to two buses of a load area in a multimachine power system. The power network analyzed in this paper is a 45-bus 10-generator section of the Brazilian power system. Regulating the voltages at the points of connection to the power system is considered to be the primary objective of the local controllers of the two STATCOMs in this study. Based on the deviations of the voltages with respect to their corresponding reference values, the hierarchical control generates the appropriate signals in the form of the auxiliary reference signals for the line voltage control loops in the two devices. Simulation results are provided to show the proposed external controller improves the performance of the power system during small and large scale disturbances

关键词： Control systems STATCOM Power system control Power systems Power system analysis computing Automatic voltage control Voltage control Power system simulation Signal generators Large-scale systems

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Bacteria Foraging: A New Tool for Simultaneous Robust Design of UPFC Controllers

Bacteria Foraging: A New Tool for Simultaneous Robust Design...

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International Joint Conference on Neural Networks (IJCNN)

作者： M. Tripathy S. Mishra G.K. Venayagamoorthy University College of Engineering Burla Orissa India Department of Electrical Engineering Indian Institute of Technology New Delhi India Department of Electrical and Computer Engineering Real-Time Power and Intelligent Systems Laboratory University of Missouri MO USA

Robust tuning of lead-lag type controller used for regulating FACTS control signal to improve dynamic stability has been an area of interest in research. This paper presents a new approach based on the foraging behavior of *** Bacteria in the human intestine, to optimize simultaneously three constants each of four lead-lag type UPFC controller present in a single machine infinite bus (SMIB) power system. For the tuning purpose, a multi-objective cost function is formulated that accounts for damping factors and ratios of various system modes for a wide range of operating conditions. Robustness of the proposed tuning method is shown by transient stability analysis of the system time domain simulations when subjected to disturbances at different operating conditions.

关键词： Microorganisms Robust control Robust stability Power system dynamics Power system stability Power system simulation Power system transients Humans Intestines Control systems

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An Interval Type-II Robust Fuzzy Logic Controller for a Static Compensator in a Multimachine Power System

An Interval Type-II Robust Fuzzy Logic Controller for a Stat...

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International Joint Conference on Neural Networks (IJCNN)

作者： S. Mohagheghi G.K. Venayagamoorthy R.G. Harley Intelligent Power Infrastructure Consortium (IPIC) in the School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri MO USA University of KwaZulu-Natal South Africa

This paper presents a novel fuzzy logic based controller for a Static Compensator (STATCOM) connected to a power system. Type-II fuzzy systems are selected that enable the controller to deal with design uncertainties and the noise associated with the measurements in the power system. Interval type-II fuzzy is computationally more effective than the ordinary type-II fuzzy systems and is more suitable for the power network with fast changing dynamics. Using a proportional-integrator approach the proposed controller is capable of dealing with actual rather than deviation signals. The STATCOM is connected to a multimachine power system in order to provide extra voltage support and improve the system dynamic performance. Simulation results are provided to show that the proposed controller outperforms a conventional PI controller during large scale faults as well as small disturbances. The type-II fuzzy membership functions provide a robust performance for the controller and eliminate the need for a model based adaptive control scheme.

关键词： Robust control Fuzzy logic Control systems STATCOM Power systems Power system dynamics Power system measurements Fuzzy systems Automatic voltage control Power system simulation

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COS: A Configurable OS for Embedded SoC systems

COS: A Configurable OS for Embedded SoC Systems

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IEEE International Conference on Embedded and real-time Computing systems and Applications (RTCSA)

作者： Hsin-hung Lin Chih-Wen Hsueh Real-Time Systems Laboratory Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Embedded System and Wireless Networking Laboratory Graduate Institute of Networking and Multimedia and Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

As the increasing of system performance and computing power, embedded systems are more complicated and interactive. Therefore, operating system (OS) plays a more important role in embedded systems to utilize various hardware and software resources. However, no OS can meet all requirements of various embedded systems. Due to the advance of reconfigurable processors, system requirements can be more dynamic. Embedded OS has becoming more critical in the development of embedded systems and thus there is a strong need of configurable embedded OS to better and faster build up the target system. In this paper, we propose a configurable OS, called COS, based on SOA (service-oriented architecture) for embedded SoC (system on a chip) systems to build an application specific OS according to the system requirements. COS can be easily configured to better utilize the resources of the target embedded platform and have better support to the embedded application. Moreover, the COS can easily extend new features or functionalities of other OSes and even be adapted to the designs of other OSes. We implement COS on an ARM platform to prove its configurability and also evaluate its overhead. We believe that COS can be configured to meet the various requirements in embedded SoC systems and help to speed up the embedded system development process

关键词： Embedded system Kernel System-on-a-chip Service oriented architecture Operating systems real time systems Laboratories computer science Power engineering and energy System performance

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A fault-tolerant P-Q decoupled control scheme for static synchronous series compensator

A fault-tolerant P-Q decoupled control scheme for static syn...

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IEEE General Meeting Power& Energy Society

作者： Wei Qiao R.G. Harley G.K. Venayagamoorthy Intelligent Power Infrastructure Consortium (IPIC) in the School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA University of KwaZulu-Natal Durban South Africa Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

Control of nonlinear devices in power systems relies on the availability and the quality of sensor measurements. Measurements can be corrupted or interrupted due to sensor failure, broken or bad connections, bad communication, or malfunction of some hardware or software (referred to as missing sensor measurements in this paper). This paper proposes a fault-tolerant control scheme (FTCS) for a static synchronous series compensator (SSSC). This FTCS consists of a sensor evaluation and (missing sensor) restoration scheme (SERS) cascaded with a P-Q decoupled control scheme (PQDC). It is able to provide effective control to the SSSC when single or multiple crucial sensor measurements are unavailable. Simulation studies are carried out to examine the validity of the proposed FTCS. During the simulations, single and multiple phase current sensors are assumed to be missing, respectively. Results show that the SERS restores the missing data correctly during steady and transient states, including small and large disturbances, and unbalanced three-phase operation. Thus, the FTCS continuously provides effective control to the SSSC with and without missing sensor measurements

关键词： Fault tolerance Communication system control Software measurement Nonlinear control systems Control systems Power system faults Power system measurements Power system control Power systems Sensor systems

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