Modeling and Estimating Current Harmonics of Variable Electronic Loads

Wichakool, Warit; Avestruz, Al-Thaddeus; Cox, Robert W.; Leeb, Steven B.

doi:10.1109/tpel.2009.2029231

Cited by 79 publications

(43 citation statements)

References 13 publications

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“…This can capture the steady-state and transient characteristics of the diode bridge rectifier. An approximate switching function of the diode bridge rectifier is used in order to obtain the estimating function for the fundamental current harmonics [4].This method is proven to be effective in finding out the input current harmonic content. A switching function model for voltage source inverter is derived and also it is validated using MATLAB/Simulink [5].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of VSI Fed Induction Motor Drive in Matlab/Simulink

Uma¹,

Vijayarekha²

2017

IJECE

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The theory of reference frames and switching functions are effective in analyzing the performance of the induction motor fed from VSI (Voltage Source Inverter). In this work, mathematical model of Adjustable Speed Drive (ASD) is developed by taking synchronous reference frame equations for induction motor, switching function concept for VSI and non-switching concept for diode bridge rectifier. Simulation model of induction machine is implemented using dq0 axis transformations of the stator and rotor variables in the arbitrary reference frame. The corresponding equations are given in the beginning and then the developed model is implemented using MATLAB/Simulink. In this work, the proposed model is implemented using basic function blocks. The performance of induction motor is analysed for different frequencies. The developed model is tested for the steady state behavior of machine drive. The proposed mathematical model is validated by the simulation results. Keyword: Converters INTRODUCTIONIn many industrial applications Adjustable speed drives (ASD) are most commonly seen workhorses. In order to supply the motor with variable AC voltage or AC current with variable frequency Variable Frequency Drives (VFD) are employed. ASDs are used in pumping applications, in sugar cane industries, conveyor applications etc. The common VFD consists of a three phase diode bridge rectifier, dc link and a pulse width modulated inverter. It is necessary to develop a model for VFD for power system dynamic studies. In literature, for the three phase diode bridge rectifier dq impedance model is employed [1]. State-space averaging method is used for modeling a three phase four wire diode bridge rectifier [2]. Dynamic average value modeling methods are utilized for conventional three phase diode bridge rectifier and are validated [3]. This can capture the steady-state and transient characteristics of the diode bridge rectifier. An approximate switching function of the diode bridge rectifier is used in order to obtain the estimating function for the fundamental current harmonics [4].This method is proven to be effective in finding out the input current harmonic content. A switching function model for voltage source inverter is derived and also it is validated using MATLAB/Simulink [5].Modulation function theory is effectively utilized for deriving the Pulse Width Modulated (PWM) inverter which makes use of the Iterative Harmonic and Interharmonics Analysis (IHIA) [6]. Space vector pulse width modulation method is employed for inverter and the method is validated using MATLAB/Simulink [7]. A three phase boost dc-ac converter is used to supply the induction motor [8]. AC output voltage that is greater than the input dc voltage is obtained without the need of additional boost converter.

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Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of VSI Fed Induction Motor Drive in Matlab/Simulink

Uma¹,

Vijayarekha²

2017

IJECE

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“…In earlier charging stations, which used passive power factor correction rectifiers [13][14][15], it was difficult to reduce the harmonics from the charger. Active power filters (APF) can be used in a charging station to compensate for the harmonics produced by the nonlinear loads.…”

Section: Introductionmentioning

confidence: 99%

“…Harmonic distortion will occur in the voltage and current on the AC (Alternating Current) side of the charging station because of the coupling between the rectifier and the power grid. The existing literature on this topic has mainly employed experimental testing [2,5] and simulation analysis [14,15]. However, the former method is only applicable to charging facilities under experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Capacity Calculation of Shunt Active Power Filters for Electric Vehicle Charging Stations Based on Harmonic Parameter Estimation and Analytical Modeling

Zhou

Wang

et al. 2014

Energies

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Abstract:The influence of electric vehicle charging stations on power grid harmonics is becoming increasingly significant as their presence continues to grow. This paper studies the operational principles of the charging current in the continuous and discontinuous modes for a three-phase uncontrolled rectification charger with a passive power factor correction link, which is affected by the charging power. A parameter estimation method is proposed for the equivalent circuit of the charger by using the measured characteristic AC (Alternating Current) voltage and current data combined with the charging circuit constraints in the conduction process, and this method is verified using an experimental platform. The sensitivity of the current harmonics to the changes in the parameters is analyzed. An analytical harmonic model of the charging station is created by separating the chargers into groups by type. Then, the harmonic current amplification caused by the shunt active power filter is researched, and the analytical formula for the overload factor is derived to further correct the capacity of the shunt active power filter. Finally, this method is validated through a field test of a charging station.

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“…At a particular site, these harmonics may be uniquely associated with the VSD and can be used to estimate the fundamental current harmonic and the power consumption of the VSD accurately using a data-driven model [6]. The estimating function based on empirical data is sensitive to changes in the environment such as input voltage harmonics [7]. An alternative estimator was developed by modeling and analyzing the behavior of the internal circuit of the VSD, specifically the uncontrolled three-phase rectifier [7].…”

Section: Introductionmentioning

confidence: 99%

“…The estimating function based on empirical data is sensitive to changes in the environment such as input voltage harmonics [7]. An alternative estimator was developed by modeling and analyzing the behavior of the internal circuit of the VSD, specifically the uncontrolled three-phase rectifier [7]. The model-based estimator solves the issue of the input voltage distortions, enhancing the robustness of the estimator.…”

Section: Introductionmentioning

confidence: 99%

A waveform-based power estimator for variable power loads

Wichakool

Remscrim

Orji

et al. 2011

2011 IEEE Energy Conversion Congress and Exposition

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This paper proposes a method to derive an estimator that predicts the power consumption of variable power loads from a subset of higher current harmonics without requiring a full analysis of the internal circuit of the load. The method exploits structural features of the current waveforms consumed by the load to develop the estimator. The computation involves Gaussian elimination of a cyclotomic field representation to compute the estimator coefficients, avoiding floating-point computational error. Experimental results have shown that the proposed algorithm can derive estimators that can extract the power consumption of variable speed drives, computers, or light dimmers from fixed power loads in aggregate measurements.

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Modeling and Estimating Current Harmonics of Variable Electronic Loads

Cited by 79 publications

References 13 publications

Modeling and Simulation of VSI Fed Induction Motor Drive in Matlab/Simulink

Modeling and Simulation of VSI Fed Induction Motor Drive in Matlab/Simulink

Capacity Calculation of Shunt Active Power Filters for Electric Vehicle Charging Stations Based on Harmonic Parameter Estimation and Analytical Modeling

A waveform-based power estimator for variable power loads

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