Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Nonsinusoidal Currents and Compensation (ISNCC), 2010 International School on

Date 15-18 June 2010

Filter Results

Displaying Results 1 - 25 of 44
  • [Front cover]

    Publication Year: 2010 , Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (168 KB)  
    Freely Available from IEEE
  • [Title page]

    Publication Year: 2010 , Page(s): i
    Save to Project icon | Request Permissions | PDF file iconPDF (34 KB)  
    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2010 , Page(s): ii
    Save to Project icon | Request Permissions | PDF file iconPDF (18 KB)  
    Freely Available from IEEE
  • Contents

    Publication Year: 2010 , Page(s): iii - v
    Save to Project icon | Request Permissions | PDF file iconPDF (44 KB)  
    Freely Available from IEEE
  • Preface

    Publication Year: 2010 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (15 KB)  
    Freely Available from IEEE
  • Committees

    Publication Year: 2010 , Page(s): 2
    Save to Project icon | Request Permissions | PDF file iconPDF (25 KB)  
    Freely Available from IEEE
  • Conference subject matter

    Publication Year: 2010 , Page(s): 3
    Save to Project icon | Request Permissions | PDF file iconPDF (17 KB)  
    Freely Available from IEEE
  • [Blank page]

    Publication Year: 2010 , Page(s): 4
    Save to Project icon | Request Permissions | PDF file iconPDF (4 KB)  
    Freely Available from IEEE
  • Reflections on power theories for poly-phase nonsinusoidal voltages and currents

    Publication Year: 2010 , Page(s): 5 - 16
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (435 KB) |  | HTML iconHTML  

    This tutorial paper reviews the fundamentals of different methods for current decomposition and non-active power compensation in poly-phase power systems. The basic concepts and the properties of the instantaneous active and reactive power theory and of the active/reactive average power theory are discussed and critically compared. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Instantaneous p–q power theory for control of compensators in micro-grids

    Publication Year: 2010 , Page(s): 17 - 26
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1324 KB) |  | HTML iconHTML  

    The main objective of this tutorial is to present the basic concepts on the instantaneous p-q Theory and then show its applicability for controlling switching converters connected in a micro-grid. These converters can be used for connecting renewable energy sources (solar, wind, and others) to the micro-grids or for harmonic, reactive power or unbalance compensation, and even for voltage regulation. The emphasis is given on the compensation characteristics derived from the p-q Theory, and simulation results of test cases are shown. Special attention is put on the oscillating component of the instantaneous real power, as it may produce torque oscillations or frequency variations in weak systems (micro-grids) generators. This oscillating component, as defined in the p-q Theory, gives the amount of oscillating energy between the source and the load, and its compensation through a switching compensator must have an energy storage element to exchange it with the load. With the p-q Theory this energy storage element can be easily calculated as a function of the average component of the instantaneous real power, which depends on the observation period. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • CPC-based comparison of compensation goals in systems with nonsinusoidal voltages and currents

    Publication Year: 2010 , Page(s): 27 - 36
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (347 KB) |  | HTML iconHTML  

    There is some level of confusion upon goals of compensation in systems with nonsinusoidal voltages and currents (NV&C), especially considering that compensation with switched compensators is a recursive process. This recursive nature of compensation is often ignored in discussions on compensation. This paper presents results of studies on recursive compensation with a switching compensator, aimed at reducing the supply current to its active component, defined according to Fryze, according to CPC power Theory, and to its working component. The paper also shows that the instantaneous reactive power p-q theory-based algorithm for switching compensator control, does not provide, in the presence of the supply voltage harmonics and/or asymmetry, right control of such compensators. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Conservative Power Theory, sequence components and accountability in smart grids

    Publication Year: 2010 , Page(s): 37 - 45
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (902 KB) |  | HTML iconHTML  

    Smart grids offer a new challenging domain for power theories and compensation techniques, because they include a variety of intermittent power sources which can have dynamic impact on power flow, voltage regulation, and distribution losses. When operating in the islanded mode, smart micro-grids can also exhibit considerable variation of amplitude and frequency of the voltage supplied to the loads, thus affecting power quality and network stability. Due to the limited power capability of smart micro-grids, voltage distortion can also get worse, affecting measurement accuracy and possibly causing tripping of protections. In such a context, a reconsideration of power theories is required, since they form the basis for supply and load characterization and accountability. A revision of control techniques for harmonic and reactive compensators is also required, because they operate in a strongly interconnected environment and must perform cooperatively to face system dynamics, ensure power quality and limit distribution losses. This paper shows that the Conservative Power Theory (CPT) provides a suitable background to cope with smart grids characterization needs, and a platform for the development of cooperative control techniques for distributed switching power processors and static reactive compensators. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Distributed intelligence for smart grid control

    Publication Year: 2010 , Page(s): 46 - 58
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1587 KB) |  | HTML iconHTML  

    This paper provides an overview of the challenges, their potential solutions and the trends in the control of electrical power distribution in presence of distributed generation. Power grids are supposed to go through a significant transformation in the close future. Distribution is supposed to be mostly affected. The tutorial reviews the current practice and outlines the possible evolutions towards a more intelligent grid able to operate more dynamically mostly under the hypothesis of a large penetration of renewable energy sources or distributed energy sources more in general. Some specific topics are then addressed with reference to recent research results such network-based control, distributed state estimation and distributed intelligence. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic grid-flux-based control for grid connected voltage-source converters

    Publication Year: 2010 , Page(s): 59 - 68
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (309 KB) |  | HTML iconHTML  

    Power-grid connected voltage-source converters provide two-way energy exchange with the grid. They are used for renewable energy applications, combined heat and power, active filtering and loads with dynamically changing working conditions. Aggravated grid codes and dynamic loads require very fast control methods. A control based on the integral of the grid voltage (called grid flux) offers extremely fast dynamics and graphical understanding. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flux-based control of 3-phase Active Front End

    Publication Year: 2010 , Page(s): 69 - 73
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1884 KB) |  | HTML iconHTML  

    Active Front End converters (AFE) connect a DC link to a grid, usually with three phases. They allow energy flow in both directions, reduce grid-current harmonics, needed short-circuit power and non-active power in comparison to diode or thyristor-based devices. One more advantage, with is in the center of this paper, is the dynamic reaction to load variations combined with the need for robust control under varying grid parameters. The worst-case variations of grid parameters, in this context, are voltage sags and voltage unsymmetry (e.g. phase faults). This paper presents a control concept employing an inner, virtual-grid-flux based control for fast current control and an outer DC-link voltage control with a conventional PI controller. The layout of the controllers is detailed. Simulations characterise the dynamic performance concerning load variation and grid parameter variation. A comparison of measured and simulated result of a step-wise load change proves the validity of the simulation and the control concept. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • p–q power theory: Some theoretical and practical aspects

    Publication Year: 2010 , Page(s): 74 - 79
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (129 KB) |  | HTML iconHTML  

    This paper presents an analysis of Akagi's p-q theory for active filtering under real nonsinusoidal voltage conditions. It is ascertained that compensating the alternative parts of the instantaneous active and reactive powers leads to a sinusoidal power source current only under sinusoidal voltage conditions. The mathematical demonstration is found and it is verified on some practical examples. It is shown that the difference between Akagi's active current and the true active current is very small for operation under real conditions of voltage total harmonic distortion factor below 10%. A modified definition of the active component of the current is proposed for operation under nonsinusoidal voltage conditions. The DC motor and full control rectifier driving system is used as a case study. Finally, a mathematical inconsequence that put under uncertainty the p-q theory correctness under nonsinusoidal voltage conditions is pointed out. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hybrid power filter with single tuned passive filter - dynamical properties

    Publication Year: 2010 , Page(s): 80 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1843 KB) |  | HTML iconHTML  

    The paper has been intended to present the analysis of hybrid power filter (HPF) dynamical properties. The hybrid power filter with single tuned passive filter has been taken into consideration. The present paper deals with influence of control algorithm and its components on dynamical properties of HPF. Experimental results of transient states have also been included in the article. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The use of geometric algebra in circuit analysis and its impact on the definition of power

    Publication Year: 2010 , Page(s): 89 - 95
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    Geometric algebras of the Euclidean 2-dimensional and 3-dimensional spaces have been used to analyze electric circuits with linear and harmonic generating loads (HGLs). It is shown in this paper that with both loads, time domain signals may be transformed to the Gn domain such that the resulting multivectors permit circuit analysis through rotations and dilation-contractions of the excitation signal. The power equation, in particular, is created by applying the geometric product of the voltage and current multivectors and is suitable for linear and nonlinear loads. This is in contrast to commonly used frequency analysis methods where the reactive power cannot be obtained in correspondence with its definition in the time domain and it fails at providing a unified power equation for linear and HGLs. We interpret the proposed power equation in the frequency and time domains and introduce an analogous quantity to the reactive power Q, the CN-power, for circuits with nonlinear loads. A power factor equation applicable to both loads is also presented. The resulting one-to-one correspondence between the time domain and the Gn domain avoids eliminating any component from the power equation in the time domain. Single-phase circuit examples are provided. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The effect of PWM frequency on the effectiveness of protection against electric shock using residual current devices

    Publication Year: 2010 , Page(s): 96 - 100
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (339 KB) |  | HTML iconHTML  

    In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. The impact of these distorted currents on the fibrillation effect is evaluated. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequencies is discussed. Operational characteristic of the proposed residual current device is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Three-phase AC systems interfaced by current source matrix converter with space vector modulation

    Publication Year: 2010 , Page(s): 107 - 112
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1452 KB) |  | HTML iconHTML  

    The paper deals with three-phase AC systems interfaced by frequency converter without DC storage. As an interface between AC systems the current source matrix converter (CSMC) with space vector modulation (SVM) is used. First the averaged state space models are formulated. Next, the results of the analysis based on two frequency D-Q transformation method are presented. Furthermore simulation and experimental test results of ca 1 kVA laboratory model are presented to confirm of the discussed circuit properties. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The properties of the method of frequency errors correction of input circuits within the range of nonlinear operation

    Publication Year: 2010 , Page(s): 113 - 116
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    The paper concerns the method of the correction of frequency errors of input circuits, elaborated for correction of module errors and phase errors of linear input circuits. The method is implemented in the spectral domain in a programmed manner. The author presents the findings of experimental research which show the efficiency of the method in measurements of rms value of nonsinusoidal current within the range of linear and nonlinear processing characteristics of a current transformer. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • CPC based converter control for systems with non-ideal supply voltage

    Publication Year: 2010 , Page(s): 117 - 122
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (805 KB) |  | HTML iconHTML  

    In recent years there have been many strategies proposed for use of proportional plus resonant P-R controllers both in the stationary and in the synchronous reference frame that demonstrate grid-connected converter performance can be improved under non-ideal supply conditions such as supply asymmetry and supply voltage distortion. However, when employed in systems with high frequency variability such as micro-grids, the synchronization method required for operation in the synchronous reference frame or for dynamic retuning of the resonant controller may experience poor performance or even loss of phase-lock. A method is presented here based on CPC current decomposition that allows control of grid connected converters without direct supply synchronization. In this paper the proposed method is described and then performance is evaluated for systems with high frequency variability and non-ideal supply voltage conditions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power electronics active filter with controlled dynamics and improved EMC

    Publication Year: 2010 , Page(s): 123 - 126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1680 KB) |  | HTML iconHTML  

    Present tendencies of evaluation current distortion compensation methods aim to work out such compensator (serial or parallel active filter) which would be able to realize real time compensation of current distortions. The assumed aim of parallel active filter work is dynamic compensation of differential current which is the difference between load current and reference current. Unfortunately, dynamics of every real power electronics current source, being essential part of parallel filter, is limited. Proposed idea of increasing dynamics of active filter depends on temporarily changing inductance of coil at the output of such current source. For improving EMC of filter this coil is powered via low-pass filter. The paper presents idea of such modified parallel power electronics active filter and investigation results of simulation model. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Orthogonality of functions describing power states in electrical circuits in Budeanu's concept

    Publication Year: 2010 , Page(s): 127 - 131
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB) |  | HTML iconHTML  

    The Budeanu's concept of circuit analyses with nonsinusoidal voltages and currents has been presented in details with Author's comments. It has been reminded that Bunet was the first who proposed summing up reactive powers of the harmonics of nonsinusoidal waveforms. This postulate was included in so called Boucherot theorem. It has been shown that proposed by Budeanu vectors presenting the reactive power QB and deformation power D not always are orthogonal. Based on mathematical calculation Author pointed out that drawing general conclusion about orthogonality of these powers is not justifiable. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pole-restraining control of three-phase Active Front End

    Publication Year: 2010 , Page(s): 132 - 137
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (810 KB) |  | HTML iconHTML  

    State-of-the-art control approaches often neglect the time-variant characteristics of power-electronic systems in favour of a time-averaged approach. In consequence, the resulting system is partly instable, thus not optimally controlled. The pole-restraining control (PRC) removes the inherent instability, giving considerably improved dynamic behaviour. These improvements are demonstrated for three-phase Active Front Ends (AFE). The essentials of the pole-restraining control approach are explained, the improved transient behaviour is illustrated by comparison to other state-of-the-art control schemes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.