DC Offset Error Compensation for Synchronous Reference Frame PLL in Single-Phase Grid-Connected Converters

Hwang, Seon‐Hwan; Li, Liming; Li, Hui; Kim, Jang-Mok

doi:10.1109/tpel.2012.2190425

Cited by 104 publications

(41 citation statements)

References 16 publications

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“…Typically, the measured back-EMF is digitalized through matching circuits including voltage sensor, low pass filter, and A/D converter. As a result, a DC offset error may be generated from the voltage sensor itself because of sensor errors, the thermal variation of the analog electric device and the quantization error of the A/D converter [11][12][13][14].…”

Section: Back-emf-based Sensorless Methodsmentioning

confidence: 99%

“…When using the sensorless control method based on the back-EMF estimation, the back-EMF information is measured by the voltage sensor of the system after passing the digital controller signal through a low pass filter (LPF) and analog to digital conversion (ADC). In this process, back-EMF measurement errors can occur due to the nonlinearity of the voltage sensor, the thermal variation of the analog electric device, and ADC quantization errors [11][12][13][14]. At this time, the main component of any occurring nonlinear errors is the direct current (DC) offset error, and when this DC offset error component occurs, it causes a pulsation in the synchronous coordinate system d axis voltage.…”

Section: Introductionmentioning

confidence: 99%

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A Back-EMF Estimation Error Compensation Method for Accurate Rotor Position Estimation of Surface Mounted Permanent Magnet Synchronous Motors

2017

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This paper proposes a back electromotive force estimation error compensation method for accurate rotor position estimation of surface mounted permanent magnet synchronous motors. When estimating the rotor position of surface mounted permanent magnet synchronous motor sensorless drives, a direct current offset error component occurs in the voltage sensor. As a result, the rotor position is distorted and the sensorless control in surface mounted permanent magnet synchronous motor is degraded. In addition, the dq-axis voltages in the synchronous reference frame have the direct current offset error component, ripples compared with the motor frequency under the distorted rotor position. In this paper, the effects of the direct current offset errors are analyzed based on the synchronous reference frame phase locked loop. To remove this direct current offset error component, a d-axis voltage is converted into a synchronous reference frame again to compensate. In other words, it is a dual synchronous coordinate conversion compensation method. The compensator utilizes a proportional-integral controller that compensates by estimating the direct current offset error component. The proposed method is useful for the improvement of surface mounted permanent magnet synchronous motor sensorless control and operating performance. The effectiveness of the proposed algorithm is verified through PSIM simulation and experimental results.

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Section: Back-emf-based Sensorless Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Back-EMF Estimation Error Compensation Method for Accurate Rotor Position Estimation of Surface Mounted Permanent Magnet Synchronous Motors

2017

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“…It should be mentioned that the developed OSG exhibits DC offset rejection by integrating a simple integral loop. This is different from DC offset elimination loops based on the error between the input signal and the output in-phase signal proposed in [14] and [15]. Subsequently, the new AF-SPLL is proposed.…”

Section: Introductionmentioning

confidence: 99%

A New Orthogonal Signal Generator with DC Offset Rejection for Single-Phase Phase Locked Loops

Huang¹,

Dong²,

Fang³

et al. 2016

Journal of Power Electronics

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This paper presents a new orthogonal signals generator (OSG) with DC Offset rejection for implementing a phase locked loop (PLL) in single-phase grid-connected power systems. An adaptive filter (AF) based on the least mean square (LMS) algorithm is used to constitute the OSG in this study. The DC offset in the measured grid voltage signal can be significantly rejected in the developed OSG technique. This generates two pure orthogonal signals that are free from the DC offset. As a result, the DC offset rejection performance of the presented single-phase phase locked loop (SPLL) can be enhanced. A mathematical model of the developed OSG and the principle of the adaptive filter based SPLL (AF-SPLL) are presented in detail. Finally, simulation and experimental results demonstrate the feasibility of the proposed AF-SPLL.

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“…In [15], the focus is on rejecting the dc offset in the single-phase synchronous reference frame PLL. This algorithm can be implemented by a simple integral operation and the proportional-integral (PI) controller without additional hardware.…”

Section: Introductionmentioning

confidence: 99%

Improved DC Offset Error Compensation Algorithm in Phase Locked Loop System

Park¹,

Jung²

2016

Journal of Electrical Engineering and Technology

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-This paper proposes a dc error compensation algorithm using dq-synchronous coordinate transform digital phase-locked-loop in single-phase grid-connected converters. The dc errors are caused by analog to digital conversion and grid voltage during measurement. If the dc offset error is included in the phase-locked-loop system, it can cause distortion in the grid angle estimation with phase-locked-loop. Accordingly, recent study has dealt with the integral technique using the synchronous reference frame phase-locked-loop method. However, dynamic response is slow because it requires to monitor one period of grid voltage. In this paper, the dc offset error compensation algorithm of the improved response characteristic is proposed by using the synchronous reference frame phase-locked-loop. The simulation and the experimental results are presented to demonstrate the effectiveness of the proposed dc offset error compensation algorithm.

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DC Offset Error Compensation for Synchronous Reference Frame PLL in Single-Phase Grid-Connected Converters

Cited by 104 publications

References 16 publications

A Back-EMF Estimation Error Compensation Method for Accurate Rotor Position Estimation of Surface Mounted Permanent Magnet Synchronous Motors

A Back-EMF Estimation Error Compensation Method for Accurate Rotor Position Estimation of Surface Mounted Permanent Magnet Synchronous Motors

A New Orthogonal Signal Generator with DC Offset Rejection for Single-Phase Phase Locked Loops

Improved DC Offset Error Compensation Algorithm in Phase Locked Loop System

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