Impact of STATCOM and SSSC on synchronous generator LOE protection

Ghorbani, Amir; Mozafari, Babak; Soleymani, Soodabeh; Ranjbar, Ali Mohammad

doi:10.3906/elk-1403-13

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…Segundo Neves (2020), a proteção contra perda de excitação de geradores síncronos, a alocação dos dispositivos FACTS em LTs poderá provocar atraso de tempo da atuação do relé de proteção, levando a máquina a ficar maior tempo exposta nas condições de falta que são prejudiciais para sua vida útil, como relatado nos estudos de Elsamahy (2013), Yaghobi (2014), Mati (2017) e Ghorbani (2016).…”

Section: Introductionunclassified

Influência da inserção do dispositivo STATCOM na proteção contra perda de excitação de geradores: Uma contribuição utilizando a lógica fuzzy

Dutra

Coelho

Baracho

et al. 2022

Proceedings IX Simpósio Brasileiro De Sistemas Elétricos

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Brazil is a country with continental dimensions and has a power generation system interconnected with all regions, through transmission lines (TLs), allowing supply for its all-consumption centers. However, building new TLs may be unfeasible in an environmental and financial sense. With the advancement of power electronics, FACTS (Flexible Alternating Current Transmission Systems) devices were created, which are based on series or parallel reactive compensation in the network, allowing flexibility in system operation, with lower transmission losses and better stability. However, the insertion of such devices may cause the maloperation of synchronous generators protection. In this sense, this work presents the effects of inserting one FACTS model (STATCOM -Static Synchronous Compensator), in relation to the protection system against the loss of excitation of synchronous generators. To identify and improve the protection response against loss of excitation, it is proposed to use a fuzzy classifier, which has its effectiveness compared to the traditional scheme that uses the impedance characteristic.Resumo: O Brasil é um país com dimensões continentais e possui um sistema de geração de energia interligado em todas suas regiões, através de linhas de transmissão (LTs), permitindo um atendimento a todos seus centros de consumo. Entretanto, construir novas LTs pode ser inviável no sentido ambiental e financeiro. Com o avanço da eletrônica de potência, os dispositivos FACTS (Flexible Alternating Current Transmission Systems) foram criados, os quais se baseiam em compensação série ou paralela de reativos na rede, permitindo uma flexibilização na operação do sistema, com menores perdas de transmissão e melhor estabilidade. Porém, a inserção de tais dispositivos pode afetar a proteção de geradores síncronos. Neste sentido, este trabalho apresenta os efeitos da inserção de um modelo de dispositivo FACTS (STATCOM -Static Synchronous Compensator), em relação ao sistema de proteção contra a perda de excitação de geradores síncronos. A fim de identificar e melhorar a resposta da proteção contra perda de excitação, propõe-se a utilização de um classificador fuzzy, o qual tem sua efetividade comparada com o esquema de tradicional que utiliza a característica de impedância.

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Section: Introductionunclassified

Influência da inserção do dispositivo STATCOM na proteção contra perda de excitação de geradores: Uma contribuição utilizando a lógica fuzzy

Dutra

Coelho

Baracho

et al. 2022

Proceedings IX Simpósio Brasileiro De Sistemas Elétricos

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“…The second category of FACTS devices such as static synchronous series compensator (SSSC) can control the power transfer by compensating reactance of a transmission network. During the LOE, the SSSC injects the voltage based on a reference voltage, and it can lead to the mal-operation of the LOE relay [14][15]. The third category of FACTS devices has the series-shunt connection to the power system such as unified power flow controller (UPFC).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

Moravej¹,

Rasooli²,

Pazoki³

2019

ijeei

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The advantages of using flexible AC transmission system devices increase the penetration of these devices in the existing power systems, but it is necessary to reconsider the protection schemes of a compensated network. This paper investigates four conventional schemes of loss of excitation (LOE) protection, which is used in the commercial relays, in the presence of Unified Power Flow Controller (UPFC) by both analytical and simulation approaches. The first scheme is based on the capability curve of the synchronous generator. The second scheme is the admittance-based method. The third scheme uses two double circled diagrams with a negative offset. The fourth scheme uses doubled circle diagram with a positive offset and directional element. This paper compares and evaluates the performance of these schemes in precise detail. In addition to LOE, the impact of partial loss of excitation, external fault and power swing on the LOE relay in the presence of UPFC is investigated.

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“…That all leads to increase in the number of technological disturbances in power systems and decrease the reliability of parallel operation of power plants and power systems, as a whole. In particular, disconnection of a generating unit became more frequent due to the loss of excitation (incorrect operation of AVR) in power plants, moreover, due to the fact that interconnecting mains are usually "weak" and heavily loaded, it in turn causes the lowfrequency (0,1-0,5 Hz) fluctuations with large amplitude in power systems and leads to a non-effective operation of AVR and false operation of protective relays [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The concept of usage HRTSIM as a device for setting and certification of AVR

Askarov

Ruban

2017

MATEC Web Conf.

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Impact of STATCOM and SSSC on synchronous generator LOE protection

Abstract: Loss of excitation (LOE) protection is one of the most important protections of synchronous generators.Nowadays, application of an impedance relay with two negative offset operation zones to protect LOE is prevalent; this

Cited by 11 publications

References 24 publications

Influência da inserção do dispositivo STATCOM na proteção contra perda de excitação de geradores: Uma contribuição utilizando a lógica fuzzy

Influência da inserção do dispositivo STATCOM na proteção contra perda de excitação de geradores: Uma contribuição utilizando a lógica fuzzy

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

The concept of usage HRTSIM as a device for setting and certification of AVR

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