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A novel control method for the compensation voltages in dynamic voltage restorers

A novel control method for the compensation voltages in dyna...

引用

19th Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2004

作者： Lee, Sang-Joon Kim, Hyosung Sul, Seung-Ki Sch. of Elec. Eng./Computer Science Seoul National University Korea Republic of Deptartment of Control Engineering Cheonan National Technical College Korea Republic of

This paper discusses the control of the compensation voltages in dynamic voltage restorers (DVR). On analyzing the power circuit of a DVR system, control limitations and control targets are presented for the compensation voltage control. Based on the preceeded power stage analysis, a novel controller for the compensation voltages in DVRs is proposed by a feedforward control scheme. This paper also discusses the time delay problems in the control system of DVRs. Digital control systems inevitably have control delay due to its the sampling of signal, the switching frequency of an inverter, and the signal delay due to sensor itself. The total signal delay is considerable in real implementation and it endanger the system stablity. This paper analyzes the relationship among the control delay, closed loop damping factor, and the output filter parameters of DVR inverters. Based on the control system analysis, a guideline is proposed to design the appropriate output filter parameters and the inverter switching frequency for DVRs. The proposed theory is verified by an experimental DVR system, which is controlled in full digital manner.

关键词： Voltage control

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Reference wave generation in dynamic voltage restorers by use of PQR power theory

Reference wave generation in dynamic voltage restorers by us...

引用

19th Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2004

作者： Kim, Hyosung Lee, Sang-Joon Sul, Seung-Ki Dept. of Control Engineering Cheonan National Technical College Korea Republic of Sch. of Elec. Eng./Computer Science Seoul National University Korea Republic of

Dynamic voltage restorer (DVR)s are known as effective and economic means to compensate for voltage sags and swells [1]-[11], This paper proposes a novel method to generate reference waves synchronized with the grid whether or not the line voltages are distorted by a fault. The proposed reference wave generator (RWG) looks for the normal voltage waveforms in the grid from the corrupted line voltages and synthesizes the expected positive sequence reference waves for DVRs. There is no transient problem on the generated reference waves when the line voltages are distorted by faults. Experimental results verified the proposed theory very well.

关键词： Electrical engineering

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An improved fuzzy algorithm with dynamically adjusting the basic control quantity and the scaling factor

An improved fuzzy algorithm with dynamically adjusting the b...

引用

Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Lai, Y.I.-Nan Mei, Zhao-Xin Ming-Zhu, Lai Coll. of Mech. and Power Engineering Harbin Univ. of Sci. and Technology Harbin 150080 China Computer and Control College Harbin Univ. of Sci. and Technology Harbin 150080 China

ISBN: (纸本)0780384032

According to the characteristic of the first-order system with the time-delay and the large inertia, the paper proposes a grading fuzzy control algorithm based on the object specified value. The basic control quantity and the scaling factor are adjusted dynamically. The self-adjusting factor varies with the different control stage. Simulation with a typical first-order air conditioner system shows that improved fuzzy control algorithm can eliminate the steady-state error and restrain over modulation. The respond speed is rapidly. The control frequent is smooth. Due to combining the look-up table with calculation on-line, the hardware resource is also economized.

关键词： Fuzzy control

来源：评论

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Improved line-of-sight guidance for cruising underwater vehicles

Improved line-of-sight guidance for cruising underwater vehi...

引用

2004 IFAC Conference on computer Applications in Marine Systems, CAMS 2004

作者： Balearic, Vedran Vukic, Zoran Antonic, Radovan Brodarski Inslitut Av. V Holjevca 20 Zagreb10020 Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing Unska 3 Zagreb10000 Croatia Split College of Maritime Studies Zrinsko-Frankopanaka 38 Split21000 Croatia

Guidance through waypoinis is common for small autonomous marine vehicles. Guidance by the line of sight, which turns the vehicle directly towards the next waypoint without any reference path calculation, is computationally the simplest form of waypoint guidance. However, the basic algorithm gives rather poor guidance due to the missed waypoint problem, lack of sea current compensation and abrupt transitions between the consecutive waypoinis. Significant path deviations and even deadlocks are possible due to these problems. Therefore, more complex algorithms are usually used in real world applications. The research reported in this paper aims to demonstrate that significant improvements of the basic line-of-sight guidance algorithm can be achieved by several intuitive, simple corrections and additions. The simplicity of the basic line-of-sight guidance algorithm is not compromised. In particular, missed waypoint detection is performed by monitoring the distance between the vehicle and the waypoint. Introduced reference heading corrections are based upon the location of the next waypoint after the one the vehicle is currently approaching, and upon the sea current direction and intensity. The results of these corrections are shown in several simulation examples. In addition, the paper includes a short discussion about the lineof-sight guidance in the diving plane. Copyright 2004 IFAC.

关键词： Autonomous vehicles

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On hierarchical extensions of large-scale 4-regular grid network structures

On hierarchical extensions of large-scale 4-regular grid net...

引用

Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications, PDPTA'04

作者： Pedersen, Jens Myrup Patel, Ahmed Knudsen, Thomas Phillip Madsen, Ole Brun Department of Control Engineering Aalborg University DK-9220 Aalborg East Denmark Comp. Netwk./Distributed Syst. R.G. Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

ISBN: (纸本)1932415262

It is studied how the introduction of ordered hierarchies in 4-regular grid network structures decreases distances remarkably, while at the same time allowing for simple topological routing schemes. Both meshes and tori are considered;In both cases non-hierarchical structures have power-law dependencies between the number of nodes and the distances in the structures. The perfect square mesh is introduced for hierarchies, and it is shown that applying ordered hierarchies in this way results in logarithmic dependencies between the number of nodes and the distances, resulting in better scaling structures. For example, in a mesh of 391876 nodes the average distance is reduced from 417.33 to 17.32 by adding hierarchical lines. This is gained by increasing the number of lines by 4.20% compared to the non-hierarchical structure. A similar hierarchical extension of the torus structure also results in logarithmic dependencies, the relative difference between performance of mesh and torus structures being less significant than for non-hierarchical structures, especially for large structures. The skew and extended meshes are introduced as variants of the perfect square mesh and their performances studied, and it is shown that while they allow for more flexibility in design and construction of structures supporting topological routing, their performances are comparable to the performance of the perfect square mesh. Finally suggestions for further research within the field is given.

关键词： Large scale systems

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Improved basic planar algorithm of vehicle guidance through waypoints by the line of sight

Improved basic planar algorithm of vehicle guidance through ...

引用

International Symposium on Communications control and Signal Processing (ISCCSP)

作者： V. Bakaric Z. Vukic R. Antonic Department of Control Engineering Brodarski institut Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing Zagreb Croatia Split College of Maritime Studies Split Croatia

Guidance through waypoints is common for small autonomous marine vehicles. Guidance by the line of sight, the basic waypoint guidance algorithm, is very simple, computationally inexpensive, and flexible to sudden changes in the desired path specification. On the other side, the basic algorithm achieves unoptimal vehicle trajectory, ignores possible side disturbances as sea currents, and can even lead to deadlock situations. Therefore it should be improved to use in the real world applications. This paper introduces several such improvements: missed waypoint detection to prevent deadlocks, novel reference heading correction method to give smoother vehicle path in turns at waypoints, and sea current compensation method to cancel its influence. This improvements address the mentioned flaws of the basic algorithm, as is demonstrated by the simulations, and yet keep it simpler than is the case for the most used waypoint-derived guidance methods.

关键词： Navigation Remotely operated vehicles computer vision System recovery Error correction control engineering Automatic control control engineering computing Automotive engineering Automation

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Signal propagation delay as a barrier to control applications in WAN

Signal propagation delay as a barrier to control application...

引用

Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications, PDPTA'04

作者： Knudsen, Thomas Phillip Patel, Ahmed Pedersen, Jens Myrup Madsen, Ole Brun Department of Control Engineering Aalborg University Aalborg East DK 9220 Denmark Comp. Netwk. Distributed Syst. R. G. Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

ISBN: (纸本)1932415262

With the advent in WAN of delay sensitive technical applications, such as remote control, signal propagation delay becomes a major problem. The extent of the problem is analysed by lower bounding the delay in relation to different transmission media. Requirements for reliability and bandwidth are considered. The consequences of this bounding for communication network planning and provisioning are discussed in relation to mitigating the effects of signal propagation delay as a barrier to the penetration of control applications into WAN.

关键词： Wide area networks

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An improved fuzzy algorithm with dynamically adjusting the basic control quantity and the scaling factor

An improved fuzzy algorithm with dynamically adjusting the b...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Yi-Nan Lai Zhao-Xin Mei Lai Ming-Zhu College of Mechanical & Power Engineering Harbin University of Science and Technology Harbin China Computer & Control College Harbin University of Science and Technology Harbin China

ISBN: (纸本)0780384032

According to the characteristic of the first-order system with the time-delay and the large inertia, the paper proposes a grading fuzzy control algorithm based on the object specified value. The basic control quantity and the scaling factor are adjusted dynamically. The self-adjusting factor varies with the different control stage. Simulation with a typical first-order air conditioner system shows that unproved fuzzy control algorithm can eliminate the steady-state error and restrain over modulation. The respond speed is rapid. The control frequent is smooth. Due to combining the look-up table with calculation on-line, the hardware resource is also economized.

关键词： Fuzzy control Heuristic algorithms control systems Steady-state Sampling methods Error correction Delay effects Educational institutions Paper technology Hardware

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A design consideration of output filters for dynamic voltage restorers

A design consideration of output filters for dynamic voltage...

引用

Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Hyosung Kim Jang-Hwan Kim Seung-Ki Sul Department of Control Engineering Cheonan National Technical College South Korea School of Electrical Engineering & Computer Science Seoul National University South Korea

ISBN: (纸本)0780383990

The cutoff frequency of a LC output filter for dynamic voltage restorers (DVR) limits the control bandwidth of a DVR system and the attenuation factor against the inverter switching ripples. For a selected cutoff frequency of a LC output filter, infinite number of L-C combinations is possible. Although different L-C combination has different filter characteristics, the filter design on L-C combination has been depended on field experiences without clear analysis. This paper proposes a design criterion and a design example for the L-C filter combination considering the control characteristics and the size of DVRs. An experimental DVR system based on the proposed LC output filter design methodology is built and tested.

关键词： Filters Cutoff frequency Voltage control control systems Bandwidth Attenuation Inverters Size control Design methodology System testing

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Reference wave generation in dynamic voltage restorers by use of PQR power theory

Reference wave generation in dynamic voltage restorers by us...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Hyosung Kim Sang-Joon Lee Seung-Ki Sul Department of Control Engineering Cheonan National Technical College South Korea School of Electrical Engineering and Computer Science Seoul National University South Korea

Dynamic voltage restorer (DVR)s are known as effective and economic means to compensate for voltage sags and swells. This paper proposes a novel method to generate reference waves synchronized with the grid whether or not the line voltages are distorted by a fault. The proposed reference wave generator (RWG) looks for the normal voltage waveforms in the grid from the corrupted line voltages and synthesizes the expected positive sequence reference waves for DVRs. There is no transient problem on the generated reference waves when the line voltages are distorted by faults. Experimental results verified the proposed theory very well.

关键词： Power generation Circuit faults Phase locked loops Power quality Mesh generation Dynamic voltage scaling Power generation economics Surges control systems Frequency

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