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Effect of harmonic distortion on electric energy meters of different metrological principles

Illia DIAHOVCHENKO, Vitalii VOLOKHIN, Victoria KUROCHKINA, Michal ŠPES, Michal KOSTEREC

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 377-385 doi: 10.1007/s11708-018-0571-1

Abstract: This paper deals with the errors of electric energy metering devices as a result of distortions in the shape of the curves of voltage and current load. It is shown and proved that the errors in energy measurements depend on the design and the algorithms used in electricity meters. There are three main types of metering devises having different principles: inductive (electro-mechanical), electronic static, and digital electronic (microprocessor). Each of these types has its measuring features. Some devices take into account all the harmonic distortions and the constant component which occur in the network while others measure the power and energy values of the fundamental harmonic only. Such traits lead to the discrepancies in the readings of commercial electric energy meters of different types. Hence, the violations in the measurement system unity occur, and a significant error can be observed in the balance of transmitted/consumed electric energy.

Keywords： current     distortion     electric energy meter     harmonics     power quality    

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Equivalent thermal conductivity of heat pipes

LU Zesheng, MA Binghui

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 462-466 doi: 10.1007/s11465-008-0087-1

Abstract: In precision machining, the machining error from thermal distortion carries a high proportion of theIf a precision machining tool can transfer heat fast, the thermal distortion will be reduced and theWhen a heat pipe is applied to a hydrostatic motorized spindle, the thermal distortion cannot be solvedThe proposed model provides a calculation method for the thermal distortion analysis of heat pipes applied

Keywords： proposed     distortion analysis     hydrostatic motorized     motorized spindle     Performance    

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Performance investigation of artificial intelligence based controller for three phase four leg shunt active filter

J. JAYACHANDRAN,R. MURALI SACHITHANANDAM

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 446-460 doi: 10.1007/s11708-015-0378-2

Abstract: In this paper, the choice of power quality compensator is a DSTATCOM which constitutes a three phase four leg voltage source converter (VSC) with a DC capacitor. The control strategy proposed for the DSTATCOM is a neural network based one cycle control (OCC). This control strategy involves neural network block, digital circuits and linear elements, which eliminates the sensors required for sensing the load current and coupling inductor current in addition to the multiplier employed in the conventional method. The calculation of harmonic and reactive currents for the reference current generation is also eliminated, thus minimizing the complexity in the control strategy. The control strategy mitigates harmonic/reactive currents, ensures balanced and sinusoidal source current from the supply mains that are nearly in phase with the supply voltage, compensates neutral current, and maintains voltage across the capacitor under unbalanced source and load conditions. The performance of the DSTATCOM with the proposed artificial neural network (ANN) controllers is validated and investigated through simulations using Matlab software. The simulation results prove the efficacy of the proposed neural network based control strategy under varying source and load conditions.

Keywords： neural network     DSTATCOM     neutral current mitigation     total harmonic distortion (THD)     three phase four wire    

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Preparation and properties of nano SiO2 core-shell structured additives and their nanocomposite with polypropylene

KE Yangchuan, SUN Mingzhuo, SONG Yanxin, YANG GuangFu

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1,   Pages 76-80 doi: 10.1007/s11705-007-0016-6

Abstract: The NPP0-PP composite has a transparency of over 93%, haze lower than 15%, and a heat distortion temperature

Keywords： deformation coefficient     distortion temperature     excellent     NPP0-PP     traditional nucleation    

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Power quality investigation of a solar PV transformer-less grid- connected system fed DVR

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 240-253 doi: 10.1007/s11708-014-0322-x

Abstract: control scheme which performs power quality control at a maximum power by reducing the total harmonic distortion

Keywords： data-based maximum power point tracking (MPPT)     total harmonic distortion (THD)     proportional integral    

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The Study of an Improved Algorithm About Hilbert Energy Spectrum

Yang Jianwen,Jia Minping,Xu Feiyun,Hu Jianzhong

Strategic Study of CAE 2005, Volume 7, Issue 7,   Pages 55-59

Abstract:

The Hilbert energy spectrum's principle in HHT is analyzed in the paper; Aimed to solve the end problem in the instantaneous spectrum figure, the cause is researched and ARMA model is introduced in the calculation of Hilbert of HHT. By the simulation of several typical IMFs about vibration signal of rotating machine, and comparing with the conventional methods, the advanced method is proved to be able to improve the end problem effectively and optimize the Hilbert energy spectrum greatly.

Keywords： Hilbert transform     the distortion of end     instantaneous parameter     intrinsic mode function    

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A simple digital control algorithm for three phase shunt active filter: simulation and experimentation

Subbaraman SRINATH, Chandan KUMAR, M. P. SELVAN

Frontiers in Energy 2014, Volume 8, Issue 1,   Pages 119-128 doi: 10.1007/s11708-013-0288-0

Abstract: The hardware results correlate with the simulation results in reducing the total harmonic distortion

Keywords： filter (SAF)     power quality     voltage source inverter (VSI)     digital signal processor (DSP)     total harmonic distortion    

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Robust switched fractional controller for performance improvement of single phase active power filter under unbalanced conditions

H. AFGHOUL,F. KRIM,D. CHIKOUCHE,A. BEDDAR

Frontiers in Energy 2016, Volume 10, Issue 2,   Pages 203-212 doi: 10.1007/s11708-015-0381-7

Abstract: A novel controller is proposed to regulate the DC-link voltage of a single phase active power filter (SPAPF). The proposed switched fractional controller (SFC) consists of a conventional PI controller, a fractional order PI (FO-PI) controller and a decision maker that switches between them. Commonly, the conventional PI controller is used in regulation loops due to its advantages in steady-state but it is limited in transient state. On the other hand, the FO-PI controller overcomes these drawbacks but it causes dramatic degradation in control performances in steady-state because of the fractional calculus theory and the approximation method used to implement this kind of controller. Thus, the purpose of this paper is to switch to the PI controller in steady-state to obtain the best power quality and to switch to the FO-PI controller when external disturbances are detected to guarantee a fast transient state. To investigate the efficiency and accuracy of the SFC considering all robustness tests, an experimental setup has been established. The results of the SFC fulfill the requirements, confirm its high performances in steady and transient states and demonstrate its feasibility and effectiveness. The experiment results have satisfied the limit specified by the IEEE harmonic standard 519.

Keywords： conventional PI controller     fractional calculus (FC)     total harmonic distortion (THD)     Oustaloup continuous    

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Title Author Date Type Operation

Effect of harmonic distortion on electric energy meters of different metrological principles

Illia DIAHOVCHENKO, Vitalii VOLOKHIN, Victoria KUROCHKINA, Michal ŠPES, Michal KOSTEREC

Journal Article

Equivalent thermal conductivity of heat pipes

LU Zesheng, MA Binghui

Journal Article

Performance investigation of artificial intelligence based controller for three phase four leg shunt active filter

J. JAYACHANDRAN,R. MURALI SACHITHANANDAM

Journal Article

Preparation and properties of nano SiO2 core-shell structured additives and their nanocomposite with polypropylene

KE Yangchuan, SUN Mingzhuo, SONG Yanxin, YANG GuangFu

Journal Article

Power quality investigation of a solar PV transformer-less grid- connected system fed DVR

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

Journal Article

The Study of an Improved Algorithm About Hilbert Energy Spectrum

Yang Jianwen,Jia Minping,Xu Feiyun,Hu Jianzhong

Journal Article

A simple digital control algorithm for three phase shunt active filter: simulation and experimentation

Subbaraman SRINATH, Chandan KUMAR, M. P. SELVAN

Journal Article

Robust switched fractional controller for performance improvement of single phase active power filter under unbalanced conditions

H. AFGHOUL,F. KRIM,D. CHIKOUCHE,A. BEDDAR

Journal Article