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- W4376058619 abstract "With the large number of power electronic power sources such as wind power, photovoltaic power, energy storage connected to the grid, the degree of electric power electronic system gets higher and higher. The fault characteristics of power electronic power supply and synchronous generator are obviously different. When unbalance fault occurs in transmission line especially in the case of high transition resistance, the zero-sequence current will be so small that the zero-sequence overcurrent protection of the line fails to operate, which brings great challenges to the traditional relay protection. In this paper we analyzed the adaptability of traditional zero-sequence protection in different working conditions under the background of typical high-proportion new energy grid engineering, and a high-sensitivity protection principle for unbalance faults of high-proportion new energy access system is proposed. On the basis of traditional zero-sequence overcurrent protection, the protection sensitivity is improved by combining zero-sequence voltage criteria. Considering that the zero-sequence current and zero-sequence voltage criteria may not be sensitive enough under high resistance fault conditions, and the limiting link of some systems will also reduce the fault current, the three-phase voltage specific unbalance is defined to reflect the characteristics of the fault. The voltage specific unbalance fits the voltage characteristics well when unbalance fault occurs in transmission line. In theory the results are very accurate when the fault is identified by the voltage specific unbalance. In order to avoid the influence of phasor extraction algorithm of power frequency, the proposed method uses modulus values of voltage and current instantaneous values in one power frequency period to replace the power frequency phasor. We have verified that the proposed method has a good ability to identify faults with high transition resistance especially when dealing with unbalance faults under different working conditions. The method can still accurately identify line faults when the transition resistance reaches 150 ohms." @default.
- W4376058619 created "2023-05-11" @default.
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- W4376058619 date "2022-01-01" @default.
- W4376058619 modified "2023-10-17" @default.
- W4376058619 title "A high-resistance unbalance fault identification method for high-proportion new energy access system" @default.
- W4376058619 doi "https://doi.org/10.1049/icp.2023.0116" @default.
- W4376058619 hasPublicationYear "2022" @default.
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