Islanding phenomenon elimination study at Rokko test center

Kitamura, Akio; Okamoto, Masahiro; Yamamoto, Fumio; Nakaji, Kazuo; Matsuda, H.; Hotta, Kazutaka

doi:10.1109/wcpec.1994.520070

Cited by 33 publications

(16 citation statements)

References 1 publication

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“…The topic of whether multiple-inverter testing for certification and listing purposes (if so, how many) also must be addressed soon. In the impedance insertion method, a low-value-impedance, usually a capacitor bank [21,22,23] is installed on the utility system inside the potential island at point "b" as shown in Figure 9. The switch is normally open.…”

Section: Ndzmentioning

confidence: 99%

“…This method offers several advantages. It is highly effective in preventing islanding [21,22] as long as the small delay is allowed between the time of switch opening and the time of capacitor insertion to ensure that insertion of the capacitor will not actually create a balanced situation between the PV inverter and a lagging load. Capacitors of this type are readily available, and utilities have a great deal of experience with them.…”

Section: Ndzmentioning

confidence: 99%

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Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems

Bower¹,

Ropp²

2002

279

281

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This report describes the various methods and circuits that have been developed to detect an islanding condition for photovoltaic applications and presents three methods that have been developed to test those methods and circuits. Passive methods for detecting an islanding condition basically monitor parameters such as voltage and frequency and/or their characteristics and cause the inverter to cease converting power when there is sufficient transition from normal specified conditions. Active methods for detecting the island introduce deliberate changes or disturbances to the connected circuit and then monitor the response to determine if the utility grid with its stable frequency, voltage and impedance is still connected. If the small perturbation is able to affect the parameters of the load connection within prescribed requirements, the active circuit causes the inverter to cease power conversion and delivery of power to the loads. The methods not resident in the inverter are generally controlled by the utility or have communications between the inverter and the utility to affect an inverter shut down when necessary. This report also describes several test methods that may be used for determining whether the anti-islanding method is effective. The test circuits and methodologies used in the U.S. have been chosen to limit the number of tests by measuring the reaction of a single or small number of inverters under a set of consensus-based worst-case conditions. FOREWORDThis report has been prepared as part of Sandia National Laboratories' Photovoltaic Systems Research and Development work for the U.S. Department of Energy. Sandia is the DOE's lead laboratory for photovoltaic systems research. The development and approach for accomplishing meaningful systems goals for the nation's photovoltaic program and the photovoltaic industry is defined through five technical objectives: (1) reduce the life-cycle costs; (2) improve the reliability; (3) increase and assure the performance and safety of fielded systems; (4) remove barriers to the use of the technology; and (5) support market growth for commercial U.S. photovoltaic systems. This evaluation of the various islanding detection methods for photovoltaic inverters and utility-interactive power systems complements Sandia's photovoltaic inverter development and evaluation goals, provides valuable information for standards and codes input, and summarizes the strengths and weaknesses of the developed anti-islanding methods available today. ABSTRACTThis report describes the various methods and circuits that have been developed to detect an islanding condition for photovoltaic applications and presents methods that have been developed to test those methods and circuits. The methods described are separated into three categories. They are:

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Section: Ndzmentioning

confidence: 99%

Section: Ndzmentioning

confidence: 99%

Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems

Bower¹,

Ropp²

2002

279

281

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“…Although this method has been proven to be highly effective in islanding detection [11], it has also important weaknesses, such as:…”

Section: A Impedance Insertionmentioning

confidence: 99%

“…Detection times can be above certain standards, such as [12]. Though, the islanding detection time decreases as the capacitance increases [11], obtaining standard complying delays with relatively small capacities, about 20% of the generation capacity [13]. Therefore, the impedance value should be sized according to the minimum variation of frequency that can be detected.…”

Section: A Impedance Insertionmentioning

confidence: 99%

Analysis of remote islanding detection methods for distributed resources

Etxegarai

Eguía²,

Zamora³

2011

REPQJ

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Abstract. Penetration of distributed generation in the power grid is increasing. This situation leads to new possibilities but also new issues, such as anti-islanding protection. During a loss-of-mains or islanding situation, distributed generation (DG) units remain feeding a part of the electrical network without connection to the main power system. Currently, DG units have to be disconnected from the grid during islanding as soon as possible, due to potential risks for repair crews and components, poor power quality in the island and reclosing problems. A fast and reliable islanding detection method could avoid mentioned issues. Among the many existing methods, remote schemes could meet these requirements.Hence, this paper presents the operating principles of remote islanding detection methods, as well as the current state of development of communication-based remote islanding detection methods to be applied in distributed power generation systems.

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“…However, setting an appropriate harmonic threshold to disconnect the inverter is nearly impossible due to presence of nonlinear loads. This renders the harmonic monitoring method as impractical [6].…”

Section: Activementioning

confidence: 99%

Development of a Robust Anti-Islanding Algorithm for Utility Interconnection of Distributed Fuel Cell Powered Generation

Jeraputra

Enjeti

2004

IEEE Trans. Power Electron.

108

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In this paper, a robust anti-islanding algorithm for distributed fuel cell powered generation (DFPG) is proposed. Three different islanding scenarios are explored and presented based on analysis of real and reactive power mismatch. It is shown via analysis that islanding voltage is a function of real power alone, whereas its frequency is a function of both real and reactive power. Following this analysis, a robust anti-islanding algorithm is developed. The proposed algorithm continuously perturbs ( 5%) the reactive power supplied by DFPG while simultaneously monitoring the utility voltage and frequency. If islanding were to occur, a measurable frequency deviation takes place upon which the real power of DFPG is further reduced to 80%; now a drop in voltage positively confirms islanding, and the DFPG is safely disconnected. This method of control is shown to be robust, able to detect islanding under resonant loads, and fast acting (operable in one cycle). Possible islanding conditions are simulated and verified with analysis. Experimental results on a 0.5-kW fuel cell inverter system connected to 120-V 60-Hz utility are discussed.Index Terms-Anti-islanding algorithm, distributed fuel cell powered generation (DFPG), islanding.

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Islanding phenomenon elimination study at Rokko test center

Cited by 33 publications

References 1 publication

Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems

Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems

Analysis of remote islanding detection methods for distributed resources

Development of a Robust Anti-Islanding Algorithm for Utility Interconnection of Distributed Fuel Cell Powered Generation

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