Research on Multiterminal Current Differential Protection Criterion With High Sensitivity and Synchronization Error Tolerance Capability

Jin, Neng; Lin, Xin; Xing, Jian; Li, Zhengtian; Liu, Shiming; Le, Chen; Ma, Xiao; Rong, Zirui; Tong, Ning

doi:10.1109/tpwrd.2018.2854891

Cited by 20 publications

(5 citation statements)

References 13 publications

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“…This ensures the safety and reliability of transmitted data. Additionally, the device facilitates the utilization of dedicated encryption chips for system key distribution and management, enabling user access verification confirmation and user data key confirmation to be effectively achieved [14][15][16][17][18][19][20].…”

Section: B Network Security Measuresmentioning

confidence: 99%

Multi-Terminal Wireless Differential Protection Method for Offshore Wind Power Collection Lines

Chen,

Xue,

Qiu

et al. 2024

IEEE Access

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The development of offshore wind power is a crucial step in China's energy transition and the achievement of carbon peaking and carbon neutrality goals. This paper first introduces a wireless communication technology for independent networking. Its applicability in the field of relay protection is analyzed, and a security encryption scheme for its use in relay protection services is designed. Considering the primary wiring form and protection function configuration of offshore wind power, a multi-terminal wireless differential protection method suitable for offshore wind power collection lines is proposed, achieving synchronization error less than 3° and typical delay of wireless self-organizing network communication less than 12ms. Utilizing multi-terminal data synchronization technology and differential protection algorithms, a scheme for fault isolation and recovery of non-faulty wind turbines is established, thereby achieving minimal range isolation of offshore wind power collection line faults and precise fault section location. The action time of multi-terminal differential protection is less than 40ms. Finally, experimental results confirm that this technology's various metrics satisfy the demands of engineering applications and hold promotional value, offering a reference for the practical application of wireless communication technology in offshore wind power collection line protection services.INDEX TERMS Offshore wind power, collection line, wireless differential protection, multi-terminal differential protection

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Section: B Network Security Measuresmentioning

confidence: 99%

Multi-Terminal Wireless Differential Protection Method for Offshore Wind Power Collection Lines

Chen,

Xue,

Qiu

et al. 2024

IEEE Access

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“…According to the standards of some countries like China, USA, South Korea, external clock synchronization such as the GPS synchronization scheme is not adopted for relay protection devices. Thus, only the point-to-point ping-pong synchronization scheme can be adopted [14]- [16]. However, in the case of asymmetrical channel delay, the channel transmission delay cannot be calculated correctly [16].…”

Section: A Synchronization Error Problemmentioning

confidence: 99%

A Differential Pilot Protection Scheme for MMC-Based DC Grid Resilient to Communication Failure

Xiang

Zhang

Yang

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Primary single-end line protection strategies of MMC HVDC systems are difficult to make a tradeoff between fast detection speed and high reliability. To improve reliability, the pilot protection schemes based on communication and data exchange can be adopted. However, the communication-based schemes suffer from potential communication failure problems, such as data error, data loss and time synchronization error. To avoid blocking of protection devices during communication failures, a resilience-oriented differential pilot protection method is proposed in this paper. To address the problem of synchronization error, a startup element based on the multiresolution morphological gradient (MMG) of traveling wave is proposed. For the problems of data error and data loss in communication, the sampled data are preprocessed by the morphological filtering (MF). And the correlation of traveling waves is used to identify the internal and external faults; the ratio of the morphological gradient of pole voltages is adopted to discriminate the faulty poles. A four-terminal MMC based DC grid model is built in PSCAD/EMTDC interfaced with the optical fiberbased communication system built in MATLAB/Simulink. The simulation results show that the protection scheme can effectively identify the faults against serious communication problems of 1% bit error rate and 5% data loss.

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“…However, the proposed method is easily affected by the line distributed capacitor current and the reliability will be decreased under pole-toground (PTG) faults with high fault resistances. Additionally, these pilot protection schemes are highly dependent on the communication between stations, which is vulnerable to the data code and synchronization errors [12].…”

Section: Introductionmentioning

confidence: 99%

A Single-End Protection Scheme for Hybrid MMC HVDC Grids Considering the Impacts of the Active Fault Current-Limiting Control

Yang

Xiang

Zhou

et al. 2021

IEEE Trans. Power Delivery

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In the hybrid modular multilevel converter (MMC) based high voltage direct current (HVDC) systems, the fault current can be actively suppressed by the converter itself, which endows a smaller requirement for current-limiting reactors (CLR) and a larger time margin for fault detection algorithms, comparing with the half-bridge MMC. But the robustness to fault resistance and noise disturbance of existing boundary protection schemes will be deteriorated with small CLRs. Moreover, the fast response of the fault current-limiting control will change the output DC voltage of hybrid MMC, which affects the fault characteristics and may cause mal-operation of existing protection algorithms. Thus, a single-end protection scheme considering the impacts of the active current-limiting control is proposed for the hybrid MMC based DC grids. The travelingwave characteristics under different fault stages are analyzed to evaluate the impacts of the fault current-limiting control. In addition, a coordination protection strategy versus different fault conditions is adopted to improve reliability. Various cases in PSCAD/EMTDC are simulated to verify that the proposed method is robust to fault resistance, fault distance, power reversal, AC faults, and immune to noise.

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Research on Multiterminal Current Differential Protection Criterion With High Sensitivity and Synchronization Error Tolerance Capability

Cited by 20 publications

References 13 publications

Multi-Terminal Wireless Differential Protection Method for Offshore Wind Power Collection Lines

Multi-Terminal Wireless Differential Protection Method for Offshore Wind Power Collection Lines

A Differential Pilot Protection Scheme for MMC-Based DC Grid Resilient to Communication Failure

A Single-End Protection Scheme for Hybrid MMC HVDC Grids Considering the Impacts of the Active Fault Current-Limiting Control

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