EPE Association: EPE 2009 - Subtopic 08-1 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (I)'

EPE 2009 - Subtopic 08-1 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (I)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 08: 'Measurements and Sensors' > EPE 2009 - Subtopic 08-1 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (I)'

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   A Fast Frequency Estimation Method for Balanced Three-Phase Systems with Harmonic Distortion
By Pedro Luis RONCERO-SANCHEZ, Xavier DEL TORO GARCIA, Alfonso PARREÃ‘O, Vicente FELIU [View]
[Download]

Abstract: The continuous monitoring of voltage characteristics in electric power systems, such as in grid-connected power converters, is required for power quality assessment and control purposes. This paper presents a fast method to estimate the fundamental frequency of the grid voltage in balanced three-phase systems containing harmonic distortion. The proposed solution is based on a fast algebraic method, which is able to calculate the frequency of a pure sinusoidal signal. Due to the presence of harmonic distortion in the grid voltage some processing is previously carried out, involving coordiante transformations and several repetitive filters. Simulation and experimental results prove the validity of the method in balanced three-phase systems containing harmonic distortion. Furthermore, a fast and accurate estimation of the frequency is obtained even in the presence of amplitude and frequency variations. The response time achieved is around half the period of the fundamental voltage component.

   A New Closed-Loop Converter for Sinusoidal Encoders -Preliminary Results-
By Lazhar BEN-BRAHIM, Mohieddine BENAMMAR, Ahmed MAHRAN, Ahmed ALHOMSI [View]
[Download]

Abstract: Sinusoidal position transducers provide accurate and reliable representation of the mechanical position of their shafts. The sine/cosine transducers signals may be used in open loop or closed loop arrangements for the determination of position. The present work describes a novel implementation of the classical PLL closed loop method without using VCO, DAC, counter and look-up tables. The proposed method makes use of the excitation signal of the resolver to estimate the sine/cosine of the estimated angle. The proposed method is simpler than the available techniques, and may be implemented easily using digital or basic analogue electronic circuitry. Beside simplicity of implementation, the proposed schemes offer the advantage of robustness to amplitude fluctuation of the transducer excitation signal. This paper describes the concept of the new method, simulation results and preliminary experimental results.

   Regular-Sampled Current Measurement in AC Drives Using Delta-Sigma-Modulators
By Wilhelm PETERS [View]
[Download]

Abstract: A delta-sigma modulator converts an analog input signal into a high-frequency stream of single bits with out-off band noise. A high-resolution signal is extracted from the bit-stream with an appropriate low pass filter. The paper emphasizes on the utilization of SincK-filters as low pass filter and proposes a sampling method that is synchronized with the controller to incorporate a regular sampling. The paper also covers the detailed analysis of SincK-filters (known as decimation filter) with different decimation ratios and filter orders, and a detailed analysis of the impulse response for the synchronization of the filter with the controller. The SincK-filter is integrated into a field-oriented control for permanent magnet synchronous motors. The whole system is realized on a FPGA-based control platform. The performance is validated by experimental results.

EPE 2009 - Subtopic 08-1 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (I)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 08: 'Measurements and Sensors' > EPE 2009 - Subtopic 08-1 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (I)'
	[return to parent folder]

	A Fast Frequency Estimation Method for Balanced Three-Phase Systems with Harmonic Distortion By Pedro Luis RONCERO-SANCHEZ, Xavier DEL TORO GARCIA, Alfonso PARREÃ‘O, Vicente FELIU	[View] [Download]
Abstract: The continuous monitoring of voltage characteristics in electric power systems, such as in grid-connected power converters, is required for power quality assessment and control purposes. This paper presents a fast method to estimate the fundamental frequency of the grid voltage in balanced three-phase systems containing harmonic distortion. The proposed solution is based on a fast algebraic method, which is able to calculate the frequency of a pure sinusoidal signal. Due to the presence of harmonic distortion in the grid voltage some processing is previously carried out, involving coordiante transformations and several repetitive filters. Simulation and experimental results prove the validity of the method in balanced three-phase systems containing harmonic distortion. Furthermore, a fast and accurate estimation of the frequency is obtained even in the presence of amplitude and frequency variations. The response time achieved is around half the period of the fundamental voltage component.

	A New Closed-Loop Converter for Sinusoidal Encoders -Preliminary Results- By Lazhar BEN-BRAHIM, Mohieddine BENAMMAR, Ahmed MAHRAN, Ahmed ALHOMSI	[View] [Download]
Abstract: Sinusoidal position transducers provide accurate and reliable representation of the mechanical position of their shafts. The sine/cosine transducers signals may be used in open loop or closed loop arrangements for the determination of position. The present work describes a novel implementation of the classical PLL closed loop method without using VCO, DAC, counter and look-up tables. The proposed method makes use of the excitation signal of the resolver to estimate the sine/cosine of the estimated angle. The proposed method is simpler than the available techniques, and may be implemented easily using digital or basic analogue electronic circuitry. Beside simplicity of implementation, the proposed schemes offer the advantage of robustness to amplitude fluctuation of the transducer excitation signal. This paper describes the concept of the new method, simulation results and preliminary experimental results.

	Regular-Sampled Current Measurement in AC Drives Using Delta-Sigma-Modulators By Wilhelm PETERS	[View] [Download]
Abstract: A delta-sigma modulator converts an analog input signal into a high-frequency stream of single bits with out-off band noise. A high-resolution signal is extracted from the bit-stream with an appropriate low pass filter. The paper emphasizes on the utilization of SincK-filters as low pass filter and proposes a sampling method that is synchronized with the controller to incorporate a regular sampling. The paper also covers the detailed analysis of SincK-filters (known as decimation filter) with different decimation ratios and filter orders, and a detailed analysis of the impulse response for the synchronization of the filter with the controller. The SincK-filter is integrated into a field-oriented control for permanent magnet synchronous motors. The whole system is realized on a FPGA-based control platform. The performance is validated by experimental results.