This paper proposed a new diagnosis model for the stator inter-turn short circuit fault in synchronous generators.Different from the past methods focused on the current or voltage signals to diagnose the electrical fa...This paper proposed a new diagnosis model for the stator inter-turn short circuit fault in synchronous generators.Different from the past methods focused on the current or voltage signals to diagnose the electrical fault,the sta-tor vibration signal analysis based on ACMD(adaptive chirp mode decomposition)and DEO3S(demodulation energy operator of symmetrical differencing)was adopted to extract the fault feature.Firstly,FT(Fourier trans-form)is applied to the vibration signal to obtain the instantaneous frequency,and PE(permutation entropy)is calculated to select the proper weighting coefficients.Then,the signal is decomposed by ACMD,with the instan-taneous frequency and weighting coefficient acquired in the former step to obtain the optimal mode.Finally,DEO3S is operated to get the envelope spectrum which is able to strengthen the characteristic frequencies of the stator inter-turn short circuit fault.The study on the simulating signal and the real experiment data indicates the effectiveness of the proposed method for the stator inter-turn short circuit fault in synchronous generators.In addition,the comparison with other methods shows the superiority of the proposed model.展开更多
随着1 000 MW机组大量接入500 k V电网,以及负荷中心220 k V电网分区后供电能力日益紧张,600 MW级机组接入220 k V电网的案例逐渐增多。结合湖北电网的实例,通过仿真计算研究了600 MW级机组接入220 k V电网可能带来的问题和应对措施,并...随着1 000 MW机组大量接入500 k V电网,以及负荷中心220 k V电网分区后供电能力日益紧张,600 MW级机组接入220 k V电网的案例逐渐增多。结合湖北电网的实例,通过仿真计算研究了600 MW级机组接入220 k V电网可能带来的问题和应对措施,并提出了应遵循的原则,相关结论和建议具有较强的实际借鉴和参考价值。展开更多
基金supported in part by the National Natural Science Foundation of China(52177042)Natural Science Foundation of Hebei Province(E2020502031)+1 种基金the Fundamental Research Funds for the Central Universities(2017MS151),Suzhou Social Developing Innovation Project of Science and Technology(SS202134)the Top Youth Talent Support Program of Hebei Province([2018]-27).
文摘This paper proposed a new diagnosis model for the stator inter-turn short circuit fault in synchronous generators.Different from the past methods focused on the current or voltage signals to diagnose the electrical fault,the sta-tor vibration signal analysis based on ACMD(adaptive chirp mode decomposition)and DEO3S(demodulation energy operator of symmetrical differencing)was adopted to extract the fault feature.Firstly,FT(Fourier trans-form)is applied to the vibration signal to obtain the instantaneous frequency,and PE(permutation entropy)is calculated to select the proper weighting coefficients.Then,the signal is decomposed by ACMD,with the instan-taneous frequency and weighting coefficient acquired in the former step to obtain the optimal mode.Finally,DEO3S is operated to get the envelope spectrum which is able to strengthen the characteristic frequencies of the stator inter-turn short circuit fault.The study on the simulating signal and the real experiment data indicates the effectiveness of the proposed method for the stator inter-turn short circuit fault in synchronous generators.In addition,the comparison with other methods shows the superiority of the proposed model.
文摘随着1 000 MW机组大量接入500 k V电网,以及负荷中心220 k V电网分区后供电能力日益紧张,600 MW级机组接入220 k V电网的案例逐渐增多。结合湖北电网的实例,通过仿真计算研究了600 MW级机组接入220 k V电网可能带来的问题和应对措施,并提出了应遵循的原则,相关结论和建议具有较强的实际借鉴和参考价值。
