An Islanding Detection Method for Grid-Connected Inverter of Distributed Renewable Generation System

Chang, Wen-Yeau

doi:10.1109/appeec.2011.5748897

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…These methods measure the rate of change of voltage (ROCOV) [55], the rate of change of frequency (ROCOF) [55][56][57][58], the rate of change of Power (ROCOP) [59], or a combination of more than one of these methods. Eq.…”

Section: E) Rate Of Change Methodsmentioning

confidence: 99%

“…To overcome this limitation, the rate of change in voltage V/t is used as an index of islanding [60]. The relation between the mismatch in real power P and the rate of change in voltage can be expressed as [55]:…”

Section: E) Rate Of Change Methodsmentioning

confidence: 99%

“…The rate of change of frequency f/t can be used as an indication of islanding since it is much larger when the grid is absent. The relation between the rate of change of frequency and the mismatch in reactive power Q was found in [55]:…”

Section: E) Rate Of Change Methodsmentioning

confidence: 99%

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Novel Anti-Islanding Detection Method and Maximum Power Tracking Algorithm for Grid Connected Photovoltaic Systems with Interleaved DC/DC Converters

Yafaoui¹

2023

Preprint

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Photovoltaic (PV) energy, which has proven to be environmentally friendly and sustainable compared to traditional energy sources, has gained widespread attention in recent years. The grid-tied PV energy conversion system has become a preferred choice for renewable power generation since it does not need energy storage devices. In this dissertation, an advanced stateof-the-art PV energy system is developed. This includes a high-efficiency zero-voltage zerocurrent switching DC/DC converter with active voltage clamping for power loss minimization, a multiphase interleaved power conversion system with cascade control for power rating expansion, a modified maximum power point tracking (MPPT) scheme with improved accuracy and dynamic response, a novel active frequency drift anti-islanding detection met hod with grid code compliances, and a laboratory prototype PV energy system for performance evaluation and verification. Various soft switched DC/DC converters for PV applications are investigated. A new gating scheme for the converter with active voltage clamping that results in zero-voltage and zerocurrent switching (ZVZCS) is proposed. The operating principles of the proposed converter are presented and its performance is investigated. To increase the power rating of the PV converters, a multi-channel DC/DC converter system, consisting of multiple units of parallel converters and operating in an interleaved mode, is developed. A new cascade control method is proposed, where the PV array voltage is controlled by a master converter and the active current sharing is implemented by the remaining slave converters. The performance of the new control method under varying temperature and irradiance levels are analyzed and verified by simulation in the Matlab/Simulink platform. Various MPPT algorithms are investigated and their performance with rapid changes in irradiance and temperature are compared. A detailed simulation of the algorithms is carried out, and an experimental setup is developed. The islanding phenomenon in renewable energy systems is examined, and an improved active anti-islanding detection method that can detect islanding with less total harmonic distortion compared to the conventional methods is proposed. The rms value and the Fourier series coefficients of the current waveform of the proposed method are obtained and used to derive the operational characteristics of the method.

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Section: E) Rate Of Change Methodsmentioning

confidence: 99%

Section: E) Rate Of Change Methodsmentioning

confidence: 99%

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Novel Anti-Islanding Detection Method and Maximum Power Tracking Algorithm for Grid Connected Photovoltaic Systems with Interleaved DC/DC Converters

Yafaoui¹

2023

Preprint

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“…Consequently, measuring the ROCOV and ROCOC can be used to distinguish whether the DC MGs are operating within the host grid or in islanded mode. The dynamic change in the voltage and the current is directly proportional to power mismatch at the point of common coupling (PCC) following islanding and can be approximated as in (3) and (4) respectively [20].…”

Section: Load Step Changesmentioning

confidence: 99%

Assessment of Passive Islanding Detection Methods for DC Microgrids

Aḥmad

Florida-James

Tzelepis

et al. 2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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This paper provides an assessment of passive islanding detection methods in DC microgrids. In order to analyse the response of a DC microgrid to an islanding event, DC voltage and current signatures are captured locally at the terminals of Distributed Energy Resources (DERs). Further analysis on DC voltage and current measurements is carried out to derive the Rate of Change of Voltage (ROCOV) and the Rate of Change of Current (ROCOC), to distinguish between genuine islanding events and other disturbances. A detailed DC microgrid has been developed in MATLAB/Simulink to analyse the response of the DERs within a DC microgrid during intentional or unintentional islanding events. The results show that these approaches cannot be used to classify and characterise between islanding and non-islanding events caused by high resistive faults for DC microgrids, as the response of the DERs are dependent on the technology and associated control systems, which influences post event analysis in distinguishing between events.

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“…In the islanding detection using the technique based in communication [2,3] a data acquisition is performed between the relays in the system in order to detect if some circuit break in the system is opened, creating an islanded system. However, this method depends of the utility infrastructure to be implemented, which makes it very complicated and expensive.…”

Section: Islanding Detectionmentioning

confidence: 99%

Analysis and computer modelling of a Rate of Change of Frequency Relay for islanding detection in the software ATPDraw

Menezes¹,

Tresso²,

Schaffer³

et al. 2024

RE&PQJ

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Abstract.Although the distributed generation is bringing many benefits to the grid, its operation is also getting even more complicated due to the many loads and generators involved into it. One important issue that must be detected as fast as possible to avoid any damage for the grid and/or the loads connected is the islanding. The paper analyses the modelling of a relay based in a passive method of islanding detection for the software ATPDraw, which is current unavailable. So we focussed in a model based in the frequency, which the rate of change of frequency relay -ROCOF -was chosen. The results show that the relay was successful to detect the islanding under various circumstances and is obeying the requisites established by the IEEE 1547.

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An Islanding Detection Method for Grid-Connected Inverter of Distributed Renewable Generation System

Cited by 12 publications

References 10 publications

Novel Anti-Islanding Detection Method and Maximum Power Tracking Algorithm for Grid Connected Photovoltaic Systems with Interleaved DC/DC Converters

Novel Anti-Islanding Detection Method and Maximum Power Tracking Algorithm for Grid Connected Photovoltaic Systems with Interleaved DC/DC Converters

Assessment of Passive Islanding Detection Methods for DC Microgrids

Analysis and computer modelling of a Rate of Change of Frequency Relay for islanding detection in the software ATPDraw

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