Islanding Detection Assessment of Multi-Inverter Systems With Active Frequency Drifting Methods

Lopes, Luiz A. C.; Zhang, Yongzheng

doi:10.1109/tpwrd.2007.911188

Cited by 141 publications

(74 citation statements)

References 9 publications

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“…In view of this shortcoming of SFS method, this paper presents a new multi grid-connected inverters islanding detection method which is based on phase locked loop (PLL). The proposed method is a composite islanding detection method which combines SFS and Sandia Voltage Shift (SVS) method, and the simulation results verify the effectiveness of the proposed method [3] .…”

Section: Introductionmentioning

confidence: 81%

Research on a novel PLL based islanding detection technology for multi grid-connected inverters

Xie¹,

Zhang²,

Gao³

2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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Abstract. Aiming at the problem that under the condition of multi grid-connection inverters, the dilution effect can easily cause islanding detection failure of Sandia Frequency Shift (SFS) method, a new phase locked loop based composite islanding detection strategy for multi grid-connected inverters is proposed. The proposed strategy combines Sandia Voltage Shift (SVS) and SFS islanding detection method to improve the success rate of multi grid-connection inverters islanding detection. In addition, the SVS method is put into use only when the condition is met, which can avoid its adverse effects on the system energy efficiency. Theoretical analysis and simulation results show that the proposed method can effectively detect the islanding in the presence of dilution effect.

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Section: Introductionmentioning

confidence: 81%

Research on a novel PLL based islanding detection technology for multi grid-connected inverters

Xie¹,

Zhang²,

Gao³

2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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“…In addition, this information is used to generate the PV inverter controller command, such as the anti-islanding function and the Active Frequency Drift (AFD) method [10][11][12]14]. This section discusses both the conventional PLL technique and the proposed one to calculate the line frequency.…”

Section: The Line Frequency Measurement Techniques From the Digital Pllmentioning

confidence: 99%

“…To obtain grid synchronization between the grid voltage and the inverter output current, it is very important to obtain grid voltage information, such as the phase, frequency, and magnitude [3][4][5][6][7][8][9]. The frequency measurement, used in the PV inverter controller, is especially important, since it plays a key role in the inverter current command, such as the anti-islanding function [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An Improved Frequency Measurement Method from the Digital PLL Structure for Single-Phase Grid-Connected PV Applications

2018

Electronics

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Abstract:The Phase Locked Loop (PLL) technique has been studied to obtain the phase and frequency information in grid-connected distributed generations for the sake of synchronizing the grid voltage and the inverter output current. In particular, the line frequency information, such as the anti-islanding function, is very important for the grid connection requirement. This paper presents a novel frequency measurement method from the digital PLL control structure for single-phase grid-connected PV applications. The conventional PLL controller uses the phase information to calculate the frequency of PV inverter output voltage after every line cycle and has shown a relatively low accuracy. This paper uses the angular frequency to directly measure the frequency after every line cycle. To verify the validity of the proposed method compared with the conventional method, a simulation was conducted. According to the simulation results, the measurement error of the proposed method is 80 times lower than the conventional one.

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“…However, the advent of rapidly growing photovoltaic systems makes some problems to the stability and the power quality in the adjacent utility. Especially, as shown in Fig 1, the most issued problem is islanding phenomenon of grid-connected inverter which is defined as an independent power generation while the utility is disconnected [2,3]. Islanding causes a number of undesirable effects like safety hazard to utility service personnel and equipment malfunction [4].…”

Section: Introductionmentioning

confidence: 99%

An improved active frequency drift anti-islanding method for multiple PV micro-inverter systems

2014

IEICE Electron. Express

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Islanding phenomenon of Photovoltaic (PV) system should be prevented because it causes a safety problem to utility service personnel and power supply facilities. Until now, various antiislanding methods have been proposed. However, these are mostly focus on the islanding prevention method for single PV system. Recently, PV system using micro-inverters are widely disseminated in the field. Accordingly, an islanding issue for multiple PV microinverter systems has been paid attention due to their interaction not to detect islanding, even though the single micro-inverter unit can prevent islanding when the single unit is only tested. This paper presents an improved active frequency drift (AFD) anti-islanding method for multiple PV micro-inverter systems. The proposed method injects every half-line cycle asymmetrical signals and uses the correlation between the injected asymmetrical signal and the corresponding half line cycle. The proposed method is verified by using PSIM simulation, compared with the conventional AFD method. It shows that the proposed method is highly effective to detect islanding even under multiple micro-inverter system while the conventional one doesn't detect islanding.

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Islanding Detection Assessment of Multi-Inverter Systems With Active Frequency Drifting Methods

Cited by 141 publications

References 9 publications

Research on a novel PLL based islanding detection technology for multi grid-connected inverters

Research on a novel PLL based islanding detection technology for multi grid-connected inverters

An Improved Frequency Measurement Method from the Digital PLL Structure for Single-Phase Grid-Connected PV Applications

An improved active frequency drift anti-islanding method for multiple PV micro-inverter systems

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