EPE Association: EPE 1997 – 89: Dialogue Session DS8c: HARMONICS AND ACTIVE FILTERS

EPE 1997 – 89: Dialogue Session DS8c: HARMONICS AND ACTIVE FILTERS - ANALYSIS AND DESIGN
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 89: Dialogue Session DS8c: HARMONICS AND ACTIVE FILTERS - ANALYSIS AND DESIGN

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   POWER SOURCE WITH PROGRAMMABLE HARMONIC CONTENTS
By J. Ballcells; D. Gonzales; M. Lamich [View]
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Abstract: The paper describes a switched power supply (PS) , allowing the synthesis of voltage or current waves witlt a programmable harmonic contents. The aim of such PS is to facilitate the test of power components frequently used in electrical power systems , in real operating conditions (up to 50 A) , when supplied by very distorted supply systems. In the simplest operation mode, a microcontroller allows the open loop control of the PS as a voltage source. It may also be controlled from. a PC equipped with an ND input card and a software, which allow the closed loop control as a current source. The results of some tests carried out on power transformers and inductors will be presented.

   AN EVALUATION OF TECHNIQUES FOR DETERMINING ACTIVE FILTER COMPENSATING CURRENTS IN UNBALANCED SYSTEMS
By S.D. Round; D.M.E. Ingram [View]
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Abstract: An active filter is used to eliminate current harmonics produced at a consumer's site. This paper evaluates five different methods of determining the compensating current for an active filter that compensates unbalanced three-phase loads. The methods compared are notch filtering, Instantaneous Reactive Power Theory, Synchronous Reference Frame, sinusoidal subtraction and the Fast Fourier Transform. Simulation results have determined that the Fast Fourier Transform method provides good steady state and transient responses for active filters in unbalanced systems.

   STATIC CONVERTER DESIGN FOR HIGH FREQUENCY SIGNAL INJECTION IN AN ELECTROMAGNETIC DEVICE CONNECTED TO THE NETWORK
By B. Cassoret; D. Roger; J.-F. Brudny [View]
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Abstract: Several methods are described which permit to inject in a high power receiver directly connected to the network a high frequency supplementary signal. This function can be considered as the dual of the active power filter one.

   ANALYSIS AND DESIGN OF A NOVEL ACTIVE POWER FILTER
By C. T. Pan; M. C. Jiang [View]
[Download]

Abstract: A novel active power filter is designed and analyzed in this paper. A low cost power circuit configuration of the active power filter and a simple synthetic sinusoidal generation technique are proposed. Reactive power compensation can be achieved without sensing and computing the reactive current component of the load. It also avoids using the mains voltage signal in the calculation of the reference compensation current. Therefore, the mains current after compensation still has a purely sinusoidal waveform even when the mains voltage is distorted. Furthermore, a critical value of the capacitor voltage magnitude on the DC side and a critical value of the reactor inductance on the AC side for successful harmonic current tracking are also derived for design applications. Finally, the performance of the active power filter is demonstrated with some simulation results.

   FEEDFORWARD VOLTAGE COMPENSATION FOR DIGITAL ACTIVE FILTER USING FREQUENCY DOMAIN DECOMPOSITION
By Kenji Kubo; Keijiro Sakai [View]
[Download]

Abstract: A new control scheme of digital current regulator for parallel compensation type active power filter is proposed. Orthogonal d-q axis coordinate transformations in n-th order frequency domain are introduced to calculate compensation voltages in a feedforward manner. The control algorithm is implemented on RISC microprocessors, sufficient harmonic current suppressing characteristics are achieved.

   Harmonic Elimination in a PWM Inverter using Genetic Algorithms
By Pascal MAUSSION; Laurent MAGNE [View]
[Download]

Abstract: This paper proposes a new method for off line pulse width modulation optimisation, with selective harmonic elimination. A genetic algoritm finds a good global solution that reduces total harmonic distorsion, even with non linear loads. Influences of some GA parameters are checked.

   THE GENERALIZED OPTIMIZATION CRITERION FOR FILTERS
By L. Frackowiak; R. Muszynski; R. Strzelecki [View]
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Abstract: ln the paper the need of passive filter optimization is substantiated and the generalized criterion for this purpose is elaborated. The way of comparing different quantities which express the compensation effects with the compensator cost index is presented. The levels of different requirement fulfillments are reduced to the dimension less values from the range between 0 and I by means of the special transformation and the desirability function. For the combination of separate requirements into one generalized optimization criterion the geometric mean formula is used. In the paper, using the proposed procedure, an example of filter optimization is given.

   ANALYSIS OF ACTIVE POWER FILTERS IN FREQUENCY DOMAIN USING THE FAST FOURIER TRANSFORM
By V. Soares; P. Verdelho [View]
[Download]

Abstract: This paper presents a simulation method for the analysis of active power filters in frequency domain under steady state conditions using the Fast Fourier Transform. With the presented method the performance of active power filters for several types of control strategies can be easily evaluated. The control strategies can be studied and compared under nonsinusoidal and unbalanced mains voltages conditions. The design of the highpass filters necessary to inject the undesirable harmonics can also be performed. Simulations reflecting a few particular network conditions for two control strategies, which are the instantaneous active and reactive current id-iq method and the instantaneous active and reactive power p-q method, are presented.

   AN ADAPTIVE HOPFIELD NEURAL NETWORK FOR FREQUENCY AND HARMONIC DETERMINATION
By L. L. Lai; W. L. Chan; A.T.P. So [View]
[Download]

Abstract: In real life, there are frequently occasions that the frequency of the signal under monitoring is varying significantly during the measurement period. That creates a large problem to the conventional approach of spectrum analysis using Fast Fourier Transform. An obvious example is the measurement of the output of a Variable Voltage and Variable Frequency Converter during the motor acceleration/deceleration stages. Many iterations are required in solving the frequency and harmonic determination using Hopfield neural network. In this paper, a solution using two adaptive Hopfield Artificial Neural Networks (NN) is being proposed. The adaptive feature comes from the slope adjustment which speeds up the convergence of the neural network. One NN is used to calculate the frequency of the signal whereas the other. is used to estimate the magnitudes and phase angles of the spectra. The deceleration profile of Danfoss Variable Speed Drive (VSD) is used as an example to illustrate the usefulness and effectiveness of this approach.

EPE 1997 – 89: Dialogue Session DS8c: HARMONICS AND ACTIVE FILTERS - ANALYSIS AND DESIGN
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 89: Dialogue Session DS8c: HARMONICS AND ACTIVE FILTERS - ANALYSIS AND DESIGN
	[return to parent folder]

	POWER SOURCE WITH PROGRAMMABLE HARMONIC CONTENTS By J. Ballcells; D. Gonzales; M. Lamich	[View] [Download]
Abstract: The paper describes a switched power supply (PS) , allowing the synthesis of voltage or current waves witlt a programmable harmonic contents. The aim of such PS is to facilitate the test of power components frequently used in electrical power systems , in real operating conditions (up to 50 A) , when supplied by very distorted supply systems. In the simplest operation mode, a microcontroller allows the open loop control of the PS as a voltage source. It may also be controlled from. a PC equipped with an ND input card and a software, which allow the closed loop control as a current source. The results of some tests carried out on power transformers and inductors will be presented.

	AN EVALUATION OF TECHNIQUES FOR DETERMINING ACTIVE FILTER COMPENSATING CURRENTS IN UNBALANCED SYSTEMS By S.D. Round; D.M.E. Ingram	[View] [Download]
Abstract: An active filter is used to eliminate current harmonics produced at a consumer's site. This paper evaluates five different methods of determining the compensating current for an active filter that compensates unbalanced three-phase loads. The methods compared are notch filtering, Instantaneous Reactive Power Theory, Synchronous Reference Frame, sinusoidal subtraction and the Fast Fourier Transform. Simulation results have determined that the Fast Fourier Transform method provides good steady state and transient responses for active filters in unbalanced systems.

	STATIC CONVERTER DESIGN FOR HIGH FREQUENCY SIGNAL INJECTION IN AN ELECTROMAGNETIC DEVICE CONNECTED TO THE NETWORK By B. Cassoret; D. Roger; J.-F. Brudny	[View] [Download]
Abstract: Several methods are described which permit to inject in a high power receiver directly connected to the network a high frequency supplementary signal. This function can be considered as the dual of the active power filter one.

	ANALYSIS AND DESIGN OF A NOVEL ACTIVE POWER FILTER By C. T. Pan; M. C. Jiang	[View] [Download]
Abstract: A novel active power filter is designed and analyzed in this paper. A low cost power circuit configuration of the active power filter and a simple synthetic sinusoidal generation technique are proposed. Reactive power compensation can be achieved without sensing and computing the reactive current component of the load. It also avoids using the mains voltage signal in the calculation of the reference compensation current. Therefore, the mains current after compensation still has a purely sinusoidal waveform even when the mains voltage is distorted. Furthermore, a critical value of the capacitor voltage magnitude on the DC side and a critical value of the reactor inductance on the AC side for successful harmonic current tracking are also derived for design applications. Finally, the performance of the active power filter is demonstrated with some simulation results.

	FEEDFORWARD VOLTAGE COMPENSATION FOR DIGITAL ACTIVE FILTER USING FREQUENCY DOMAIN DECOMPOSITION By Kenji Kubo; Keijiro Sakai	[View] [Download]
Abstract: A new control scheme of digital current regulator for parallel compensation type active power filter is proposed. Orthogonal d-q axis coordinate transformations in n-th order frequency domain are introduced to calculate compensation voltages in a feedforward manner. The control algorithm is implemented on RISC microprocessors, sufficient harmonic current suppressing characteristics are achieved.

	Harmonic Elimination in a PWM Inverter using Genetic Algorithms By Pascal MAUSSION; Laurent MAGNE	[View] [Download]
Abstract: This paper proposes a new method for off line pulse width modulation optimisation, with selective harmonic elimination. A genetic algoritm finds a good global solution that reduces total harmonic distorsion, even with non linear loads. Influences of some GA parameters are checked.

	THE GENERALIZED OPTIMIZATION CRITERION FOR FILTERS By L. Frackowiak; R. Muszynski; R. Strzelecki	[View] [Download]
Abstract: ln the paper the need of passive filter optimization is substantiated and the generalized criterion for this purpose is elaborated. The way of comparing different quantities which express the compensation effects with the compensator cost index is presented. The levels of different requirement fulfillments are reduced to the dimension less values from the range between 0 and I by means of the special transformation and the desirability function. For the combination of separate requirements into one generalized optimization criterion the geometric mean formula is used. In the paper, using the proposed procedure, an example of filter optimization is given.

	ANALYSIS OF ACTIVE POWER FILTERS IN FREQUENCY DOMAIN USING THE FAST FOURIER TRANSFORM By V. Soares; P. Verdelho	[View] [Download]
Abstract: This paper presents a simulation method for the analysis of active power filters in frequency domain under steady state conditions using the Fast Fourier Transform. With the presented method the performance of active power filters for several types of control strategies can be easily evaluated. The control strategies can be studied and compared under nonsinusoidal and unbalanced mains voltages conditions. The design of the highpass filters necessary to inject the undesirable harmonics can also be performed. Simulations reflecting a few particular network conditions for two control strategies, which are the instantaneous active and reactive current id-iq method and the instantaneous active and reactive power p-q method, are presented.

	AN ADAPTIVE HOPFIELD NEURAL NETWORK FOR FREQUENCY AND HARMONIC DETERMINATION By L. L. Lai; W. L. Chan; A.T.P. So	[View] [Download]
Abstract: In real life, there are frequently occasions that the frequency of the signal under monitoring is varying significantly during the measurement period. That creates a large problem to the conventional approach of spectrum analysis using Fast Fourier Transform. An obvious example is the measurement of the output of a Variable Voltage and Variable Frequency Converter during the motor acceleration/deceleration stages. Many iterations are required in solving the frequency and harmonic determination using Hopfield neural network. In this paper, a solution using two adaptive Hopfield Artificial Neural Networks (NN) is being proposed. The adaptive feature comes from the slope adjustment which speeds up the convergence of the neural network. One NN is used to calculate the frequency of the signal whereas the other. is used to estimate the magnitudes and phase angles of the spectra. The deceleration profile of Danfoss Variable Speed Drive (VSD) is used as an example to illustrate the usefulness and effectiveness of this approach.