EPE Association: EPE 2015 - LS1f: Measurements Techniques

EPE 2015 - LS1f: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS1f: Measurements Techniques

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   A Three-Phase Adaptive Phase-Locked Loop Scheme for Utility Grid-Connected Systems
By Sergio SILVA [View]
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Abstract: This paper deals with a phase-locked loop (PLL) algorithm for both phase-angle and frequency detections in three-phase utility grid connected systems. The proposed algorithm uses non-autonomous adaptive filters (AFs) for extracting the fundamental components of the utility voltages, while a positive sequence detector (PSD) is employed for obtaining the positive sequence components at fundamental utility frequency. Both the AFs and the PSD operate in conjunction with a three-phase power-based PLL (3pPLL) yielding the scheme called AF-PSD-3pPLL. Therefore, power quality problems that interfere on the PLL performance are mitigated, such as voltage harmonics and unbalances. The performance of the proposed AF-PSD-3pPLL algorithm is evaluated by means of experimental tests considering utility disturbances, such as voltage harmonics and unbalances, voltage sags, phase-angle jumps and frequency variations.

   Discrete Time Control Design of Three Phase PWM Rectifiers
By Christoph VAN DER BROECK [View]
[Download]

Abstract: A high bandwidth discrete time controller for three phase PWM rectifiers which optimizes the dc-link stiffness with respect to load variations is introduced. Based on one derived discrete time model of the PWM rectifier the control implementation and design is illustrated. The proposed concept is compared to a conventional design and simulations and experimental results are shown.

   Reduction of Saturation-Induced Distortion and Antiwindup in Multifrequency Current Control
By Lennart HARNEFORS [View]
[Download]

Abstract: Preventing voltage waveform distortion and integrator windup in multifrequency current control during saturated operation is a difficult combined problem, which so far has only partially been solved. In this paper, a scheme based on distortion-free saturation of the resonant-part outputs is proposed. Its effectiveness is experimentally verified.

   Wide-bandwidth Identification of Small-Signal dq Impedances of ac Power Systems via Single-Phase Series Voltage Injection
By Marko JAKSIC [View]
[Download]

Abstract: The injection of single-phase wide-bandwidth signals into three-phase ac power systems significantly reduces measurement time using the hardware with minimized number of components. Interleaved transformer-less H-bridge converter is optimized to operate as a series voltage injector, increasing the low frequency injection range by avoiding transformer saturation problems. The decoupling control is implemented, providing the effective way to balance dc capacitor voltages and regulate the series injection voltage. The modular and scalable single-phase impedance measurement unit (IMU) is designed and constructed to inject chirp, multi-tone and sinusoidal signals in series with the three-phase ac power systems. The measurement system is designed to inject all three types of signals in the full frequency range, offering a trade-off between measurement time, identification process precision, and number of identification points. The effectiveness of the proposed identification approach is verified with the online estimation of source and load impedances of actively controlled programmable voltage source and a three-phase resistive load.

EPE 2015 - LS1f: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS1f: Measurements Techniques
	[return to parent folder]

	A Three-Phase Adaptive Phase-Locked Loop Scheme for Utility Grid-Connected Systems By Sergio SILVA	[View] [Download]
Abstract: This paper deals with a phase-locked loop (PLL) algorithm for both phase-angle and frequency detections in three-phase utility grid connected systems. The proposed algorithm uses non-autonomous adaptive filters (AFs) for extracting the fundamental components of the utility voltages, while a positive sequence detector (PSD) is employed for obtaining the positive sequence components at fundamental utility frequency. Both the AFs and the PSD operate in conjunction with a three-phase power-based PLL (3pPLL) yielding the scheme called AF-PSD-3pPLL. Therefore, power quality problems that interfere on the PLL performance are mitigated, such as voltage harmonics and unbalances. The performance of the proposed AF-PSD-3pPLL algorithm is evaluated by means of experimental tests considering utility disturbances, such as voltage harmonics and unbalances, voltage sags, phase-angle jumps and frequency variations.

	Discrete Time Control Design of Three Phase PWM Rectifiers By Christoph VAN DER BROECK	[View] [Download]
Abstract: A high bandwidth discrete time controller for three phase PWM rectifiers which optimizes the dc-link stiffness with respect to load variations is introduced. Based on one derived discrete time model of the PWM rectifier the control implementation and design is illustrated. The proposed concept is compared to a conventional design and simulations and experimental results are shown.

	Reduction of Saturation-Induced Distortion and Antiwindup in Multifrequency Current Control By Lennart HARNEFORS	[View] [Download]
Abstract: Preventing voltage waveform distortion and integrator windup in multifrequency current control during saturated operation is a difficult combined problem, which so far has only partially been solved. In this paper, a scheme based on distortion-free saturation of the resonant-part outputs is proposed. Its effectiveness is experimentally verified.

	Wide-bandwidth Identification of Small-Signal dq Impedances of ac Power Systems via Single-Phase Series Voltage Injection By Marko JAKSIC	[View] [Download]
Abstract: The injection of single-phase wide-bandwidth signals into three-phase ac power systems significantly reduces measurement time using the hardware with minimized number of components. Interleaved transformer-less H-bridge converter is optimized to operate as a series voltage injector, increasing the low frequency injection range by avoiding transformer saturation problems. The decoupling control is implemented, providing the effective way to balance dc capacitor voltages and regulate the series injection voltage. The modular and scalable single-phase impedance measurement unit (IMU) is designed and constructed to inject chirp, multi-tone and sinusoidal signals in series with the three-phase ac power systems. The measurement system is designed to inject all three types of signals in the full frequency range, offering a trade-off between measurement time, identification process precision, and number of identification points. The effectiveness of the proposed identification approach is verified with the online estimation of source and load impedances of actively controlled programmable voltage source and a three-phase resistive load.