摘要
消弧线圈接地方式用于船舶中压电网时,对其机理和规律迄今还缺乏定量研究。在对船舶中压电网单相接地故障进行理论分析的基础上,结合暂态仿真,研究了消弧线圈阻尼率、脱谐度以及发电机频率偏移、燃弧时刻角等对熄弧恢复电压、重燃过电压、中性点位移电压以及故障电流的影响。结果表明,增大阻尼率将减小熄弧电压恢复超调量,从而降低重燃过电压,但也会使故障电流有所增加;而增加脱谐度会使得熄弧电压恢复超调量增加,可能引起较大的重燃过电压,为了限制故障电流,脱谐度不宜取值过大;此外,发电机频率偏移也可能导致较大的暂态过电压。
At present, a quantitative research on the mechanisms and laws of the application of resonant neutral grounding （RNG） to shipboard medium voltage （MV） power grid is scarce. Based on the theoretical analysis of single-phase to ground fault for shipboard MV power grid, combining with transient simulation, the paper studies the impact of damping ratio and tuning degree of arc-suppression coil on arc-extinct recovery voltage, re-strike overvoltage, neutral displacement voltage and fault current. The effects of generator frequency offset and arc angle are also discussed. The results show that increasing the damping ratio will decrease the arc-extinct voltage recovery overshoot, thereby reducing re-strike overvoltage, but will also increase fault current. While increasing tuning degree will increase the arc-extinct voltage recovery overshoot, and possibly cause greater re-strike overvoltage, so the tuning degree should be appropriate to restrict the fault current. In addition, the generator frequency offsets can also lead to greater transient overvoltage.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2013年第23期23-29,共7页
Power System Protection and Control
关键词
船舶中压电网
消弧线圈接地
熄弧恢复电压
重燃过电压
故障电流
shipboard medium voltage （MV） power grid
resonant neutral grounding （RNG）
arc-extinct recovery voltage
re-strike overvoltage
fault current
