New Synchronization Method for Three-Phase Three-Wire PWM Converters under Unbalance and Harmonics in the Grid Voltages

Camargo, Robinson Figueiredo de; Pereira, Alexandre Trevisan; Pinheiro, Humberto

doi:10.1109/pesc.2005.1581672

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…1 for three-phase three-wire systems. It can be applied to three-phase four-wire system with small modifications [27], as well. From the measure of two line-toline grid voltages, the normalized positive sequence synchronization vector in the fundamental frequency is obtained.…”

Section: Proposed Synchronization Methodsmentioning

confidence: 99%

New Synchronization Method For Three-phase Three-wire Pwm Converters Under Unbalanced And Distorted Grid Voltages

Camargo¹,

Pinheiro²

2006

Eletrônica de Potência

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This paper proposes a new open-loop synchronization method for three-phase three-wire PWM converters connected to the utility grid. It presents a good performance under unbalanced and highly distorted grid voltages. Moreover, it has a better performance in terms of distortions in the synchronization signals if compared with other open-loop methods and it has a good transient performance due amplitude, frequency and angle disturbances. In addition, a frequency adaptation algorithm is proposed for applications where large frequency variations are expected, such as in weak grids. Experimental results using a DSP TMS320F2812 are given to demonstrate the good performance of the proposed synchronization method.

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Section: Proposed Synchronization Methodsmentioning

confidence: 99%

New Synchronization Method For Three-phase Three-wire Pwm Converters Under Unbalanced And Distorted Grid Voltages

Camargo¹,

Pinheiro²

2006

Eletrônica de Potência

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“…Various synchronization techniques have been proposed in literatures. The zero crossing detection methods [7,8], the space-vector filtering (SVF) method [9], the artificial neural networks (ANN) method [10], the recursive weighted least-squares estimation (WLSE) algorithm [11], the discrete Fourier transform (DFT) and its modifications [12], the method based on the concept of adaptive notch filtering (ANF) [13], the Kalman filtering technique [14], the frequency-locked loop (FLL) method [15], three-phase open-loop phase-locked method [16], and the phase-locked loop (PLL) based on algorithms [17,18,19,20,21,22,23,24,25] are among the existing synchronization techniques. This paper incorporates the merits of the three-phase open-loop and closed-loop phase-locked method, and puts forward a new closed-loop phase-locked method with frequency adaptation function for three-phase grid-connected inverters.…”

Section: Introductionmentioning

confidence: 99%

A New Synchronization Algorithm for Grid-Connected Inverters

Guo¹,

Guo²

2014

Appl. Math. Inf. Sci.

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Synchronization algorithms are of great importance in control of grid-connected inverters as an integral part of distributed power generation units such as photovoltaic systems. A new all-digital closed-loop phase-locked algorithm for the synchronization signals of three-phase grid-connected inverters is presented even considering seriously distorted and variable-frequency utility conditions. The proposed synchronization algorithm can suppress the negative sequence utility voltage at fundamental frequency and high-frequency harmonic components effectively, and lock the positive sequence phase at fundamental frequency accurately. Moreover, a frequency adaptation algorithm is also proposed for applications where large frequency variations are often expected. Finally, digital simulation and experimental results both prove the feasibility of the proposed phase-locked method. The introduced synchronization method provides higher degree of immunity and insensitivity to harmonics and other types of pollutions in the utility when used to synchronize inverters.

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“…However, in the presence of grid-voltage harmonics, imbalance, or voltage amplitude change, an error in the estimated phase will occur. In order to make the PLL robust towards this polluted voltage and to recover the correct phase angle, the use of low pass filters (LPF) has been proposed in [2] and [3]. The aim of using an LPF is to extract the positive sequence of the grid voltage in the q-direction, in which the negative sequence should not appear.…”

Section: Introductionmentioning

confidence: 99%

A robust PLL for grid interactive voltage source converters

Hassan¹,

Critchley²

2010

Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010

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Phase locked loop (PLL) is an important part of the current-controlled grid-connected converter. Its job is to estimate the phase angle of the grid voltage. If the PLL is not robust, the grid-voltage distortion will lead to an error in the estimated phase leading to a degradable performance of the converter. In this paper, the effect of the PLL on the operation of a current-controlled voltage-source converter is examined. A PLL synthesis is proposed, to track the phase angle of the distorted grid voltage, and compared with a previously investigated PLL. The result found is that the proposed synthesis of the PLL is superior in case of grid voltage harmonics other than the 5 th and the 7 th orders. Moreover, the voltage amplitude oscillation has been reduced from 8% to 3%, with the proposed PLL, compared to 5% with the previously investigated PLL.

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New Synchronization Method for Three-Phase Three-Wire PWM Converters under Unbalance and Harmonics in the Grid Voltages

Cited by 9 publications

References 18 publications

New Synchronization Method For Three-phase Three-wire Pwm Converters Under Unbalanced And Distorted Grid Voltages

New Synchronization Method For Three-phase Three-wire Pwm Converters Under Unbalanced And Distorted Grid Voltages

A New Synchronization Algorithm for Grid-Connected Inverters

A robust PLL for grid interactive voltage source converters

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