Islanding Detection in Microgrids Using Harmonic Signatures

Merino, Julia; Mendoza-Araya, Patricio; Venkataramanan, G.; Baysal, Mustafa

doi:10.1109/tpwrd.2014.2383412

Cited by 87 publications

(74 citation statements)

References 35 publications

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“…The passive techniques look for some parameter deviations like voltage magnitude [7], rate of change of frequency [8], harmonics [9], or Phase angle displacement [10]. In the islanding mode, these parameters vary largely at the PCC.…”

Section: Passive Islanding Methodsmentioning

confidence: 99%

“…In cases of small differences between the load power and the PV output power, this method may not be able to detect islanding due to the large NDZ. An example of NDZ is given in Figure 3; the mismatch regions of the power components are represented by the shaded area where this method cannot detect the islanding events [9,[11][12][13][14]. on ΔP and ΔQ.…”

Section: Passive Islanding Methodsmentioning

confidence: 99%

“…However, the output power quality of the inverter and the system dynamics are not affected. The effectiveness of phase monitoring is not affected when the parallel inverters are connected to the islanded system [9]. The calculated load phase angle is given by the following equation:…”

Section: Phase Monitoring Methodsmentioning

confidence: 99%

“…This limitation can be answered by introducing an extra phase shift called the improved-SMS (IM-SMS). The IM-SMS was verified through digital simulation and experimentation, which resulted in a high reliability, easy implementation, and simplicity [9].…”

Section: Slip-mode Frequency Shift (Sms)mentioning

confidence: 99%

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Comparative Study of Passive and Active Islanding Detection Methods for PV Grid-Connected Systems

2018

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Photovoltaic (PV) power grid-connected systems have the advantages of being prompt and reliable supplies of electrical power. Nevertheless, the installation and operation requirements from the grid side have to be fulfilled in order to guarantee the security of the PV system technicians and the efficiency of the power system. Particularly, the potential for "islanding" is one of the dreads that are brought about by PV grid-connected systems. To be able to tackle these concerns, this paper investigates recent islanding detection techniques and topologies for PV systems. Active islanding detection techniques apply regular disturbances to the inverter system and then analyze the output voltage or frequency to investigate the islanding and stability of the grid. If the injected disturbances influence the load voltage or frequency, the controller forces the intermediate inverter to stop sending power to the connected load. In addition, several islanding detection techniques that inject a periodical signal to the reference current that causes a change in the magnitude of inverter output voltage when islanding happens in a three-phase photovoltaic grid-connected system are discussed. The validity of the proposed technique is tested and verified through PSIM software.

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Section: Passive Islanding Methodsmentioning

confidence: 99%

Section: Passive Islanding Methodsmentioning

confidence: 99%

Section: Phase Monitoring Methodsmentioning

confidence: 99%

Section: Slip-mode Frequency Shift (Sms)mentioning

confidence: 99%

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Comparative Study of Passive and Active Islanding Detection Methods for PV Grid-Connected Systems

2018

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“…Em [41] é apresentado um esquema de proteção passiva com base na variação da quinta harmônica em microrredes com geradores baseados em inversores. Tal método avalia a resposta em frequência para diferenciar entre operação ilhada e paralela, mas não faz uma análise da operação de sistemas baseados em geradores síncronos ou assíncronos.…”

Section: Passivaunclassified

Metodologias de ajuste das proteções anti-ilhamento de geradores distribuídos considerando múltiplos eventos

Motter¹

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AgradecimentoAgradeço acima de tudo a Deus pela oportunidade de desenvolver esta pesquisa.A minha família pelo apoio e incentivo, e a minha companheira Vivian pelo carinho, dedicação, paciência e compreensão durante todos os momentos.Ao Prof. Dr. José Carlos de Melo Vieira Júnior, pela excelente orientação e correções, por toda a paciência, dedicação e amizade, e pela confiança ao me aceitar como seu orientado.Suas contribuições e conselhos foram além do conhecimento técnico, e ajudaram no meu desenvolvimento pessoal e profissional. Os geradores distribuídos em sistemas de distribuição de energia elétrica devem ser desconectados em eventos de ilhamento, que ocorrem quando parte da rede elétrica torna-se eletricamente isolada da concessionária e o subsistema isolado continua a ser energizado pela geração distribuída. A proteção anti-ilhamento deve detectar tal condição operativa, porém pode não atuar em condições de pequenos desbalanços entre carga e geração, ou atuar incorretamente para eventos de outra natureza. Assim, um ajuste adequado dessa proteção deve desconectar o gerador rapidamente quando detecta o ilhamento e, simultaneamente, deve ser imune a eventos como curtos-circuitos e chaveamentos de carga, por exemplo. Esta pode ser uma tarefa muito difícil face às variações de carga e diferentes eventos de não ilhamento que podem ocorrer no sistema de distribuição. Portanto, nesta tese são propostas metodologias de ajuste das funções de proteção anti-ilhamento de sub/sobrefrequência, taxa de variação de frequência, salto de vetor e sub/sobretensão, que são técnicas convencionalmente utilizadas para a detecção de ilhamento de geração distribuída. O objetivo das metodologias é maximizar a detecção de ilhamento e minimizar a atuação incorreta, e são considerados cenários com múltiplos geradores distribuídos de diferentes tecnologias. Inicialmente, são explorados os principais fatores que afetam as proteções, tais como distribuição das cargas, fator de potência e desequilíbrio das cargas. Esta análise permite identificar os casos mais difíceis de detecção de ilhamento. Como segunda contribuição, foi proposta a metodologia de análise gráfica denominada Mapa de Ajustes, cuja eficácia foi comprovada por meio de casos de teste, mostrando ser capaz de melhorar a sensibilidade da proteção anti-ilhamento e minimizar atuação incorreta. Na sequência, é apresentado um método automático para ajuste e bloqueio de tensão e outro baseado em proteção adaptativa para ajuste das funções de Distributed generators in power distribution systems must be disconnected after an islanding event, which occurs when part of the power grid becomes electrically isolated from the utility and the isolated subsystem continues to be energized by the distributed generation. The antiislanding protection has to detect such operating condition, which may fail for critical loading conditions, or operate incorrectly for events of other nature than islanding. Therefore, an appropriate protection setting should quickly disconnect the generator when an ...

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A combined islanding detection algorithm for grid connected multiple microgrids for enhanced microgrid utilisation

Radhakrishnan

Ashok

Sunitha

2019

Int Trans Electr Energ Syst

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SUMMARY There is an abundant interest in microgrids due to its innate ability to operate in either utility connected or isolated mode. The existing conventional methods disconnect the individual distributed generators on loss of utility. In this work, a combined islanding detection algorithm at the point of common coupling (PCC) of the whole microgrid is proposed. It detects islanding using islanding detection monitoring factor, rate of change of inverse hyperbolic cosecant function, and voltage at the PCC as the islanding detection elements with the help of phasor measurement units. On detection of islanding event, the whole microgrid is transferred to autonomous mode. Moreover, any fault in the microgrid side which may isolate the distributed generator is detected using dilation and erosion mathematical morphological operators. The algorithm estimates the probability of power balance and probability of islanding duration at the control centre for events within the microgrid. The decision for islanded operation or disconnecting the distributed generator is communicated based on this. The proposed method is tested on a microgrid test system and verified on a section of the realistic local feeder of the Indian utility system. The simulation results indicate that the developed algorithm is quick, reliable, and secure in discriminating between the islanding and nonislanding scenarios for the various cases during both import and export conditions with an accuracy of 100%. It eliminates the nondetection zone completely even during zero power mismatch conditions. With the proposed method, any unnecessary distributed generator outage can be avoided enhancing the microgrid utilisation.

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Islanding Detection in Microgrids Using Harmonic Signatures

Cited by 87 publications

References 35 publications

Comparative Study of Passive and Active Islanding Detection Methods for PV Grid-Connected Systems

Comparative Study of Passive and Active Islanding Detection Methods for PV Grid-Connected Systems

Metodologias de ajuste das proteções anti-ilhamento de geradores distribuídos considerando múltiplos eventos

A combined islanding detection algorithm for grid connected multiple microgrids for enhanced microgrid utilisation

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