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Houlei Gao - One of the best experts on this subject based on the ideXlab platform.
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a fast Protection scheme for vsc based multi terminal dc grid
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: Guibin Zou, Chenjun Sun, Q. Feng, Qiang Huang, Houlei GaoAbstract:Abstract This paper proposes a novel Protection scheme for voltage source converter based multi-terminal direct current (VSC-MTDC) grid, in which DC line pilot Protection applies polarity comparison of initial current travelling wave and DC Busbar Protection is based on sampled value current differential theory. This DC line Protection utilizes modulus maximum of wavelet transform to get the polarity of initial current travelling wave on two ends of DC lines to distinguish internal faults from external faults. Current differential Protection based on sampling values is adopted as DC Busbar Protection, which has the characteristics of fast operation speed and less computation compared to conventional current differential Protection. A two-level voltage source converter (VSC) based four-terminal DC grid is built on the PSCAD platform and each VSC is equipped with resistive superconducting fault current limiters (R-SFCLs) to limit the short circuit current. Thus, DC circuit breakers can be used to break the DC fault current. The simulation results verify the validity and feasibility of the proposed VSC-MTDC grid Protection scheme.
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a novel Busbar Protection based on the average product of fault components
Energies, 2018Co-Authors: Guibin Zou, Shenglan Song, Shuo Zhang, Houlei GaoAbstract:This paper proposes an original Busbar Protection method, based on the characteristics of the fault components. The method firstly extracts the fault components of the current and voltage after the occurrence of a fault, secondly it uses a novel phase-mode transformation array to obtain the aerial mode components, and lastly, it obtains the sign of the average product of the aerial mode voltage and current. For a fault on the Busbar, the average products that are detected on all of the lines that are linked to the faulted Busbar are all positive within a specific duration of the post-fault. However, for a fault at any one of these lines, the average product that has been detected on the faulted line is negative, while those on the non-faulted lines are positive. On the basis of the characteristic difference that is mentioned above, the identification criterion of the fault direction is established. Through comparing the fault directions on all of the lines, the Busbar Protection can quickly discriminate between an internal fault and an external fault. By utilizing the PSCAD/EMTDC software (4.6.0.0, Manitoba HVDC Research Centre, Winnipeg, MB, Canada), a typical 500 kV Busbar model, with one and a half circuit breakers configuration, was constructed. The simulation results show that the proposed Busbar Protection has a good adjustability, high reliability, and rapid operation speed.
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A fast Busbar Protection technique based on travelling wave
2012 IEEE Power and Energy Society General Meeting, 2012Co-Authors: Houlei Gao, Guibin Zou, Minjiang XiangAbstract:Using propagation characteristics of travelling wave, an extra high speed Busbar Protection technique is proposed. If a fault occurs on the transmission line, the forward and backward travelling waves will be generated. When a fault occurs on the Busbar, the detected initial travelling waves on all lines connected to this Busbar will come from their backs, which are positive direction travelling waves. When a fault occurs on any one of these lines, the detected initial travelling waves on all healthy lines are positive direction travelling wave, whereas the direction of detected one on faulted line is negative. Utilizing amplitude integral relationship of directional travelling waves within a short time after fault, an algorithm discriminating fault direction is constructed. Analyzing fault directions of all lines, an internal Busbar fault can be fast identified from external fault. Main factors influencing Busbar Protection are simulated and analyzed. Simulation results demonstrate that the proposed technique can fast and reliably discriminate whether the Busbar has an internal fault or not. Moreover, its performances are hardly affected by earth fault resistances, fault inception angles and fault types, etc.
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a traveling wave based amplitude integral Busbar Protection technique
IEEE Transactions on Power Delivery, 2012Co-Authors: Guibin Zou, Houlei GaoAbstract:This paper proposes an extra high-speed Busbar Protection technique according to the propagation theory of traveling wave. When the fault occurs on the Busbar, the detected initial traveling waves on all connected lines will come from their back, which are defined as positive direction traveling waves. While a fault occurs on any one of these lines, the detected initial traveling waves on all healthy lines are positive direction traveling waves; however, the traveling wave direction on the faulted line is negative. Within a short duration of postfault, a criterion discriminating fault direction can be established according to the amplitude integral relationships between the positive direction traveling wave and the negative direction traveling wave. Analyzing the detected traveling wave directions for all lines, a distributed Busbar Protection scheme can be constructed. To evaluate the proposed technique, a typical Busbar model was built. Simulation results show that the proposed method can rapidly and reliably discriminate the internal faults from external faults, and the Protection performances are immune to fault resistances, fault inception angles, fault types, and current-transformer saturation.
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A Novel Distributed Busbar Protection for Digital Substation
2010 Asia-Pacific Power and Energy Engineering Conference, 2010Co-Authors: Guibin Zou, Houlei Gao, Xiaogang WangAbstract:For the digital substation based on IEC61850 communication standards, this paper presents a novel scheme of distributed Busbar Protection. According to the technical characteristics of digital substation, the configuration of distributed Busbar Protection without central unit is constructed; the requirements of data communication between merging units (MU) and distributed Busbar Protection units are analyzed and the process bus based on Ethernet is designed; last, the percentage differential algorithm for distributed Busbar Protection is introduced. Analysis shows that the proposed scheme is a simple, high reliable and feasible distributed Busbar Protection for digital substation.
Guibin Zou - One of the best experts on this subject based on the ideXlab platform.
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a fast Protection scheme for vsc based multi terminal dc grid
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: Guibin Zou, Chenjun Sun, Q. Feng, Qiang Huang, Houlei GaoAbstract:Abstract This paper proposes a novel Protection scheme for voltage source converter based multi-terminal direct current (VSC-MTDC) grid, in which DC line pilot Protection applies polarity comparison of initial current travelling wave and DC Busbar Protection is based on sampled value current differential theory. This DC line Protection utilizes modulus maximum of wavelet transform to get the polarity of initial current travelling wave on two ends of DC lines to distinguish internal faults from external faults. Current differential Protection based on sampling values is adopted as DC Busbar Protection, which has the characteristics of fast operation speed and less computation compared to conventional current differential Protection. A two-level voltage source converter (VSC) based four-terminal DC grid is built on the PSCAD platform and each VSC is equipped with resistive superconducting fault current limiters (R-SFCLs) to limit the short circuit current. Thus, DC circuit breakers can be used to break the DC fault current. The simulation results verify the validity and feasibility of the proposed VSC-MTDC grid Protection scheme.
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a novel Busbar Protection based on the average product of fault components
Energies, 2018Co-Authors: Guibin Zou, Shenglan Song, Shuo Zhang, Houlei GaoAbstract:This paper proposes an original Busbar Protection method, based on the characteristics of the fault components. The method firstly extracts the fault components of the current and voltage after the occurrence of a fault, secondly it uses a novel phase-mode transformation array to obtain the aerial mode components, and lastly, it obtains the sign of the average product of the aerial mode voltage and current. For a fault on the Busbar, the average products that are detected on all of the lines that are linked to the faulted Busbar are all positive within a specific duration of the post-fault. However, for a fault at any one of these lines, the average product that has been detected on the faulted line is negative, while those on the non-faulted lines are positive. On the basis of the characteristic difference that is mentioned above, the identification criterion of the fault direction is established. Through comparing the fault directions on all of the lines, the Busbar Protection can quickly discriminate between an internal fault and an external fault. By utilizing the PSCAD/EMTDC software (4.6.0.0, Manitoba HVDC Research Centre, Winnipeg, MB, Canada), a typical 500 kV Busbar model, with one and a half circuit breakers configuration, was constructed. The simulation results show that the proposed Busbar Protection has a good adjustability, high reliability, and rapid operation speed.
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A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid
MDPI AG, 2018Co-Authors: Yu Zeng, Guibin Zou, Chenjun Sun, Xiuyan Wei, Lingtong JiangAbstract:Nowadays, the efficient and reliable Protection and location schemes for MMC-MVDC (Modular Multilevel Converter-Medium Voltage Direct Current) grid are few. This paper is the first to propose a scheme to not only protect the feeders and the Busbar, but locate the segments in MMC-MVDC grid. To improve the reliability, this paper analyzes the transient characteristics of the pole-to-pole fault and then obtains the characteristic frequency band. Based on S-transform, STCFB (S-transform characteristic frequency band) Phase of fault component is utilized to construct the identification criterion for faulty feeder and faulty segment. The whole scheme can be divided into three steps, namely, Protection starting criterion, faulty feeder and Busbar Protection criterion, and faulty segment location criterion. Firstly, the current gradient method is utilized to quickly detect the fault and start the Protection device. Secondly, the non-unit Protection criterion on Busbar and feeders is proposed according to STCFB Phase of the voltage and current fault component. Thirdly, according to the STCFB Phase on both sides of the feeder segment, the faulty segment can be located. A radial MMC-MVDC distribution network model was built in PSCAD/EMTDC software to evaluate the performance of the Protection and location method. Simulation results for different cases demonstrate that the proposed scheme has high accuracy, good adaptability and reliability
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a novel Busbar Protection method based on polarity comparison of superimposed current
IEEE Transactions on Power Delivery, 2015Co-Authors: Shenglan Song, Guibin ZouAbstract:This paper proposes a novel Busbar Protection method based on the polarity comparison of superimposed current. Analysis shows that all lines connected to the faulted Busbar have the same polarities for the superimposed currents in case of an internal fault to Busbar; but for a fault occurring on any one of these lines, the polarity on the faulted line is opposite of those on healthy lines. According to this important characteristic, the Busbar Protection criterion can be established. To improve the reliability of the Busbar Protection method, waveforms of superimposed currents are integrated within a short time after the fault. Moreover, a new phase-mode transformation matrix is proposed to realize that single aerial modulus can reflect all fault types. A real 500-kV substation Busbar model was built in PSCAD to evaluate the performance of Busbar Protection. Simulation results demonstrate that the proposed Protection method has good adaptability, fast operation speed, and high reliability. In addition, its performance is rarely influenced by the fault initial conditions, series compensation, and CT saturation, etc.
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A fast Busbar Protection technique based on travelling wave
2012 IEEE Power and Energy Society General Meeting, 2012Co-Authors: Houlei Gao, Guibin Zou, Minjiang XiangAbstract:Using propagation characteristics of travelling wave, an extra high speed Busbar Protection technique is proposed. If a fault occurs on the transmission line, the forward and backward travelling waves will be generated. When a fault occurs on the Busbar, the detected initial travelling waves on all lines connected to this Busbar will come from their backs, which are positive direction travelling waves. When a fault occurs on any one of these lines, the detected initial travelling waves on all healthy lines are positive direction travelling wave, whereas the direction of detected one on faulted line is negative. Utilizing amplitude integral relationship of directional travelling waves within a short time after fault, an algorithm discriminating fault direction is constructed. Analyzing fault directions of all lines, an internal Busbar fault can be fast identified from external fault. Main factors influencing Busbar Protection are simulated and analyzed. Simulation results demonstrate that the proposed technique can fast and reliably discriminate whether the Busbar has an internal fault or not. Moreover, its performances are hardly affected by earth fault resistances, fault inception angles and fault types, etc.
Escudero, Alfredo Miguel Pianeta - One of the best experts on this subject based on the ideXlab platform.
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Proteção diferencial de barramentos baseada na transformada wavelet
2016Co-Authors: Escudero, Alfredo Miguel PianetaAbstract:Apresenta-se neste trabalho a implementação e testes de uma nova função de proteção diferencial numérica de baixa impedância para barramentos, na qual os conceitos da proteção diferencial tradicional são mapeados para a teoria da transformada wavelet. Para tanto, energias de operação e restrição são calculadas utilizando os coeficientes wavelet e escala obtidos a partir dos sinais de corrente medidos no sistema monitorado. Tradicionalmente, a operação da proteção de barramentos se baseia nos elementos filtrados, ou seja, nos fasores fundamentais, o que resulta em atrasos adicionais nas atuações da proteção. Neste trabalho, utilizam-se elementos instantâneos para reduzir os tempos de atuação. O critério de operação da proteção se baseia nas lógicas de atuação 1-de-1 e 2-de-2, as quais têm sido amplamente empregadas em relés reais disponíveis no comércio. Para avaliar a função de proteção proposta, diferentes condições de operação de um sistema de barra dupla de 230 kV foram simulados no AlternativeTransientsProgram (ATP). Os resultados obtidos revelam que o esquema de proteção diferencial de barramentos proposto opera de forma seletiva em casos de faltas internas e externas ao barramento, resultando em tempos de atuação menores que 1 milissegundo, mesmo quando aplicado em subestações com configurações complexas e flexíveis. Além o esquema garante a operação estável durante condições de saturação de transformadores de corrente para faltas externas, considerada a situação mais adversa que pode afetar a proteção de barramentos, levando a eventuais operações indevidas da mesma. ________________________________________________________________________________________________ ABSTRACTThis work presents the implementation and test of a new numerical lowimpedance Busbar differential Protection function, in which the fundamentals of traditional differential Protection are adapted to the wavelet transform domain. In order to do so, operating and restraint energies are computed using the wavelet and scaling coefficients obtained from the current signals measured in the monitored system. Traditionally, the differential Protection is based on filtered elements, i.e., in fundamental phasors, what results in additional operation delays. In this work, instantaneous elements are used in order to reduce the Protection operation time. The 1-out-of-1 and 2-out-of-2 operating tripping logics are used, which have been widely applied in actual numerical relays commercially available. To evaluate the proposed Protection function, different operating conditions of a 230 kV double Busbar arrangement were simulated in the Alternative Transients Program (ATP). The obtained results reveal that the proposed Busbar Protection scheme is selective in cases of faults internal and external to the monitored Busbar, resulting in Protection operation times less than 1millisecond, even when it is applied in substations with complex and flexible topologies.Also the Protection scheme remains stable operations during external faults with external fault saturation
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Proteção diferencial de barramentos baseada na transformada wavelet
'Biblioteca Central da UNB', 2016Co-Authors: Escudero, Alfredo Miguel PianetaAbstract:Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2016.Apresenta-se neste trabalho a implementação e testes de uma nova função de proteção diferencial numérica de baixa impedância para barramentos, na qual os conceitos da proteção diferencial tradicional são mapeados para a teoria da transformada wavelet. Para tanto, energias de operação e restrição são calculadas utilizando os coeficientes wavelet e escala obtidos a partir dos sinais de corrente medidos no sistema monitorado. Tradicionalmente, a operação da proteção de barramentos se baseia nos elementos filtrados, ou seja, nos fasores fundamentais, o que resulta em atrasos adicionais nas atuações da proteção. Neste trabalho, utilizam-se elementos instantâneos para reduzir os tempos de atuação. O critério de operação da proteção se baseia nas lógicas de atuação 1-de-1 e 2-de-2, as quais têm sido amplamente empregadas em relés reais disponíveis no comércio. Para avaliar a função de proteção proposta, diferentes condições de operação de um sistema de barra dupla de 230 kV foram simulados no AlternativeTransientsProgram (ATP). Os resultados obtidos revelam que o esquema de proteção diferencial de barramentos proposto opera de forma seletiva em casos de faltas internas e externas ao barramento, resultando em tempos de atuação menores que 1 milissegundo, mesmo quando aplicado em subestações com configurações complexas e flexíveis. Além o esquema garante a operação estável durante condições de saturação de transformadores de corrente para faltas externas, considerada a situação mais adversa que pode afetar a proteção de barramentos, levando a eventuais operações indevidas da mesma.This work presents the implementation and test of a new numerical lowimpedance Busbar differential Protection function, in which the fundamentals of traditional differential Protection are adapted to the wavelet transform domain. In order to do so, operating and restraint energies are computed using the wavelet and scaling coefficients obtained from the current signals measured in the monitored system. Traditionally, the differential Protection is based on filtered elements, i.e., in fundamental phasors, what results in additional operation delays. In this work, instantaneous elements are used in order to reduce the Protection operation time. The 1-out-of-1 and 2-out-of-2 operating tripping logics are used, which have been widely applied in actual numerical relays commercially available. To evaluate the proposed Protection function, different operating conditions of a 230 kV double Busbar arrangement were simulated in the Alternative Transients Program (ATP). The obtained results reveal that the proposed Busbar Protection scheme is selective in cases of faults internal and external to the monitored Busbar, resulting in Protection operation times less than 1millisecond, even when it is applied in substations with complex and flexible topologies.Also the Protection scheme remains stable operations during external faults with external fault saturation
Xingxing Dong - One of the best experts on this subject based on the ideXlab platform.
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New principle for Busbar Protection based on the Euclidean distance algorithm.
PloS one, 2019Co-Authors: Xingxing Dong, Qian Peng, Zhengwei Chang, Yinggao Yue, Yi ZengAbstract:A new fast Busbar Protection algorithm based on the comparison of the similarity of back-wave waveforms is proposed in this paper. The S-transform is performed on the back-wave from each defected transmission line connected to the Busbar, and the Protection criterion is thus constructed by using the Euclidean distance to analyze the similarity of the back-waves, with the implementation of the S-transform between the transmission lines. When a fault occurs internally on the Busbar, the Euclidean distance of the S-transformed back-wave between each associated transmission line is small, and there is a remarkable similarity between the waveform. When a fault occurs externally on the Busbar, the Euclidean distance of the S-transformed backward traveling wave between the faulty line and the nonfaulty line is larger than that between the nonfaulty lines. The wave-forms of the faulty line and the nonfaulty line bear little similarity, while there is a striking similarity between the nonfaulty lines. Therefore, a Protection criterion is established according to the ratio between the maximal similarity and the minimal similarity to discriminate the internal and external faults of the Busbar zones. The simulation results show that the proposed Busbar Protection method can discriminate the internal and external faults of Busbar zones in a sensitive and reliable way.
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New principle of Busbar Protection based on a fundamental frequency polarity comparison.
PloS one, 2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:To overcome the contradiction between speed and reliability in existing Busbar Protection schemes, a new Busbar Protection algorithm based on a polarity comparison of fundamental frequency currents is proposed. The algorithm extracts the fundamental frequency components of the fault reference current and the virtual current through a wavelet transform. The angle between the two currents is used to characterize the polarity relationship. The polarities of the virtual current and the reference current are the same when an internal fault occurs, and the angle will be small. The polarities of the two currents are opposite for an external fault, in which case the angle is larger. By analysing the variation characteristics of the angle between faults inside and outside Busbar, a Protection criterion is established, and the fault area is determined. In simulation results based on PSCAD/EMTDC, the algorithm can quickly and reliably identify the faults inside and outside the Busbar area, and its performance is not affected by the initial fault angle, fault resistance, fault type or capacitor voltage transformer (CVT) transmission characteristics.
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Busbar Protection algorithm flow based on the current polarity comparison.
2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:Busbar Protection algorithm flow based on the current polarity comparison.
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Comparison of Protection response times of the Busbar Protection algorithm.
2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:Comparison of Protection response times of the Busbar Protection algorithm.
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A New Principle for Initial Traveling Wave Active Power Differential Busbar Protection
IEEE Access, 2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:To avoid the impact of the transient saturation of a current transformer, a fast Busbar Protection method based on the initial traveling wave integrated active power differential principle is proposed in this paper. The Peterson equivalent model is applied to analyze the initial traveling wave distribution characteristics of the internal and external faults of the Busbar. The initial traveling wave active powers of each sampling point on each transmission line connected to the Busbar are calculated with the implementation of an S-transform. By introducing the integrated active power actuating quantity and active power braking quantity, a Protection criterion with a characteristic braking ratio is proposed. The theoretical analysis and experimental simulation results show that the Protection performance is sensitive and reliable, with a quick response and simple criterion, and is essentially not susceptible to the impacts of the initial fault angle, fault type, and fault resistance.
Qiaomei Wang - One of the best experts on this subject based on the ideXlab platform.
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New principle of Busbar Protection based on a fundamental frequency polarity comparison.
PloS one, 2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:To overcome the contradiction between speed and reliability in existing Busbar Protection schemes, a new Busbar Protection algorithm based on a polarity comparison of fundamental frequency currents is proposed. The algorithm extracts the fundamental frequency components of the fault reference current and the virtual current through a wavelet transform. The angle between the two currents is used to characterize the polarity relationship. The polarities of the virtual current and the reference current are the same when an internal fault occurs, and the angle will be small. The polarities of the two currents are opposite for an external fault, in which case the angle is larger. By analysing the variation characteristics of the angle between faults inside and outside Busbar, a Protection criterion is established, and the fault area is determined. In simulation results based on PSCAD/EMTDC, the algorithm can quickly and reliably identify the faults inside and outside the Busbar area, and its performance is not affected by the initial fault angle, fault resistance, fault type or capacitor voltage transformer (CVT) transmission characteristics.
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Busbar Protection algorithm flow based on the current polarity comparison.
2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:Busbar Protection algorithm flow based on the current polarity comparison.
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Comparison of Protection response times of the Busbar Protection algorithm.
2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:Comparison of Protection response times of the Busbar Protection algorithm.
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A New Principle for Initial Traveling Wave Active Power Differential Busbar Protection
IEEE Access, 2019Co-Authors: Xingxing Dong, Qiaomei WangAbstract:To avoid the impact of the transient saturation of a current transformer, a fast Busbar Protection method based on the initial traveling wave integrated active power differential principle is proposed in this paper. The Peterson equivalent model is applied to analyze the initial traveling wave distribution characteristics of the internal and external faults of the Busbar. The initial traveling wave active powers of each sampling point on each transmission line connected to the Busbar are calculated with the implementation of an S-transform. By introducing the integrated active power actuating quantity and active power braking quantity, a Protection criterion with a characteristic braking ratio is proposed. The theoretical analysis and experimental simulation results show that the Protection performance is sensitive and reliable, with a quick response and simple criterion, and is essentially not susceptible to the impacts of the initial fault angle, fault type, and fault resistance.
