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新疆大学电气工程学院
Published:2021
移动端阅览
[1]刘江山,李凤婷,解超,等.直流馈入对工频变化量距离保护影响分析及改进[J].新疆大学学报(自然科学版)(中英文),2021,38(06):753-763.
[1]刘江山,李凤婷,解超,等.直流馈入对工频变化量距离保护影响分析及改进[J].新疆大学学报(自然科学版)(中英文),2021,38(06):753-763. DOI: 10.13568/j.cnki.651094.651316.2020.12.29.0003.
DOI:10.13568/j.cnki.651094.651316.2020.12.29.0003.
为研究直流馈入对工频变化量距离保护的影响
建立了直流系统等值工频变化量阻抗模型
基于不同故障程度下直流控制策略的切换
分析了直流系统等值工频变化量阻抗的变化特性及其对工频变化量距离保护的影响.在过渡电阻较大的情况下
直流系统等值工频变化量阻抗呈容性
会造成工频变化量距离保护正方向保护范围减小.基于此
提出了工频变化量阻抗继电器与全阻抗继电器配合的改进方法
有效改善了由于直流馈入造成保护拒动的问题.最后
基于PSCAD/EMTDC的仿真结果验证了理论分析的正确性和改进措施的有效性.
In order to research the influence of DC feed on power-frequency variation distance protection
the equivalent power-frequency variation impedance model of the DC system is established. Based on the switching of HVDC control strategies under different fault levels
the change characteristics of the equivalent power-frequency variation impedance of the DC system and its influence on the power-frequency variation distance protection are analyzed. It is concluded that when the fault resistance is large
the equivalent power-frequency variation impedance of the DC system is capacitive
which will cause the protection range of the power-frequency variation distance protection to be reduced in the positive direction. Based on this
an improved method for the coordination of power-frequency variation impedance relays and impedance relays is proposed
which can solve the problem of the reduction of the protection range in the positive direction caused by DC feed. Finally
the simulation results based on PSCAD/EMTDC verify the correctness of the theoretical analysis and the effectiveness of the improvement measures.
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