12相整流发电机接地方式对直流过电压影响的研究
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摘要
在12相整流发电机发生交流侧单相接地故障时,为了能够有效抑制直流过电压,提出一种发电机中性点接地方式与过电压关系的分析方法。首先运用功率平衡的方法,对直流负载电阻进行零序回路折算,分析并等效出非故障绕组的零序回路,计算出各套绕组的零序电压。再通过向量分析法计算出故障后各相之间线电压,并进行比较分析,得出直流侧最高过电压的计算公式。结果表明,发电机中性点电阻接地时,接地电阻阻值越大,直流侧过电压越小。最后通过仿真及实验结果验证了理论分析的正确性。
In order to effectively suppress DC overvoltage in the occurrence of single-phase grounding fault of the 12 phase generator with rectifier load, an analysis method of the relation between the grounding mode of generator neutral point and DC overvoltage is proposed. First of all, the DC load resistor was converted to resistor in zero sequence circuit by power balance. The zero sequence loop of the non fault winding was analyzed, and the zero sequence voltage of each winding was calculated. Then, through vector analysis method, the line voltage between the phases were calculated and compared in fault state, and the calculation formula of maximum overvoltage on the DC side was obtained. The results show that when resistance is grounded at the neutral point of the generator, the greater the earth resistance is, the smaller the DC side voltage is. Finally, the correctness of theoretical analysis were verified by using simulation and experimental results.
In order to effectively suppress DC overvoltage in the occurrence of single-phase grounding fault of the 12 phase generator with rectifier load, an analysis method of the relation between the grounding mode of generator neutral point and DC overvoltage is proposed. First of all, the DC load resistor was converted to resistor in zero sequence circuit by power balance. The zero sequence loop of the non fault winding was analyzed, and the zero sequence voltage of each winding was calculated. Then, through vector analysis method, the line voltage between the phases were calculated and compared in fault state, and the calculation formula of maximum overvoltage on the DC side was obtained. The results show that when resistance is grounded at the neutral point of the generator, the greater the earth resistance is, the smaller the DC side voltage is. Finally, the correctness of theoretical analysis were verified by using simulation and experimental results.
引文
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[10]史伟国.发电机中性点接地方式的研究[J].上海电力学院学报,1995,11(4):40-45.Shi Weiguo.Study into ways of generator neutral grounding[J].Journal of Shanghai Institute of Electric Power,1995,11(4):40-45.
[11]张晓锋,李耕,陈亮,等.船舶交流电力系统电制选择与工作接地[J].海军工程大学学报,2017,29(2):85-91.Zhang Xiaofeng,Li Geng,Chen Liang,et al.Voltage level selection and working grounding designing for shipboard AC power system[J].Journal of Naval University of Engineering,2017,29(2):85-91.
[12]李宗礼,刘伯颖,王明辉,等.谐振接地电网失谐度测量及跟踪补偿技术研究[J].电工技术学报,2014,29(增刊1):469-474.Li Zongli,Liu Boying,Wang Minghui,et al.Research on the measurement of detuning degree and the technology of tracking compensation of resonant grounding grid[J].Transactions of China Electrotechnical Society,2014,29(S1):469-474.
[13]要焕年.电力系统谐振接地[M].北京:中国电力出版社,2009.
[14]邵英,袁立军.十二相同步发电机整流系统运行模式分析[J].中国电机工程学报,2003,23(7):129-133.Shao Ying,Yuan Lijun.Operational mode analysis of12-phase synchronous generator-rectifier-load systems[J].Proceedings of the CSEE,2003,23(7):129-133.
[2]马伟明.电力集成技术[J].电工技术学报,2005,20(1):16-20.Ma Weiming.Power system integration technique[J].Transactions of China Electrotechnical Society,2005,20(1):16-20.
[3]付立军,刘鲁锋,王刚,等.我国舰船中压直流综合电力系统研究进展[J].中国舰船研究,2016,11(1):72-79.Fu Lijun,Liu Lufeng,Wang Gang,et al.The research progress of the medium voltage DC integrated power system in China[J].Chinese Journal of Ship Research,2016,11(1):72-79.
[4]孙宇光,黄子果,陈丽,等.十二相整流同步发电机定子匝间短路故障计算[J].电工技术学报,2014,29(3):57-64.Sun Yuguang,Huang Ziguo,Chen Li,et al.Calculation of stator winding inter-turn short circuit in12-phase synchronous generators with rectifier load system[J].Transactions of China Electrotechnical Society,2014,29(3):57-64.
[5]孙宇光,黄子果,王善铭,等.十二相整流同步发电机同组星形连接绕组的相间短路故障[J].电力系统自动化,2017,41(8):153-158.Sun Yuguang,Huang Ziguo,Wang Shanming,et al.Phase-to-phase short circuit fault between same group of star-connected phase windings in twelvephase synchronous generator with rectifier load system[J].Automation of Electric Power Systems,2017,41(8):153-158.
[6]孙宇光,黄子果,魏锟,等.十二相整流同步发电机系统异桥相间短路的故障分析[J].中国电机工程学报,2017,37(3):889-897.Sun Yuguang,Huang Ziguo,Wei Kun,et al.Analysis of stator internal phase-to-phase short circuit between different bridge-rectifiers in the 12-phase synchronous generator with rectifier-load system[J].Proceedings of the CSEE,2017,37(3):889-897.
[7]张伟玲,吴新振,魏锟,等.十二相整流发电机缺桥故障运行分析[J].中国电机工程学报,2016,36(6):1724-1730.Zhang Weiling,Wu Xinzhen,Wei Kun,et al.Analysis of bridge-loss fault operation of 12-phase generators with rectifier-load[J].Proceedings of the CSEE,2016,36(6):1724-1730.
[8]毕大强,王祥珩,王维俭.大型水轮发电机中性点接地方式的若干问题分析[J].电工技术学报,2002,17(4):7-12.Bi Daqiang,Wang Xiangheng,Wang Weijian.Study on how to ground for the neutral point of large-sized hydro-generator[J].Transactions of China Electrotechnical Society,2002,17(4):7-12.
[9]毕大强,王祥珩,王维俭.基于3次谐波电压故障暂态分量的定子单相接地保护[J].电力系统自动化,2003,27(13):45-49.Bi Daqiang,Wang Xiangheng,Wang Weijian.Protection scheme based on fault transient component of third harmonic voltage for stator ground fault of generators[J].Automation of Electric Power Systems,2003,27(13):45-49.
[10]史伟国.发电机中性点接地方式的研究[J].上海电力学院学报,1995,11(4):40-45.Shi Weiguo.Study into ways of generator neutral grounding[J].Journal of Shanghai Institute of Electric Power,1995,11(4):40-45.
[11]张晓锋,李耕,陈亮,等.船舶交流电力系统电制选择与工作接地[J].海军工程大学学报,2017,29(2):85-91.Zhang Xiaofeng,Li Geng,Chen Liang,et al.Voltage level selection and working grounding designing for shipboard AC power system[J].Journal of Naval University of Engineering,2017,29(2):85-91.
[12]李宗礼,刘伯颖,王明辉,等.谐振接地电网失谐度测量及跟踪补偿技术研究[J].电工技术学报,2014,29(增刊1):469-474.Li Zongli,Liu Boying,Wang Minghui,et al.Research on the measurement of detuning degree and the technology of tracking compensation of resonant grounding grid[J].Transactions of China Electrotechnical Society,2014,29(S1):469-474.
[13]要焕年.电力系统谐振接地[M].北京:中国电力出版社,2009.
[14]邵英,袁立军.十二相同步发电机整流系统运行模式分析[J].中国电机工程学报,2003,23(7):129-133.Shao Ying,Yuan Lijun.Operational mode analysis of12-phase synchronous generator-rectifier-load systems[J].Proceedings of the CSEE,2003,23(7):129-133.