中文摘要：

为确保间歇性能源系统的安全稳定运行,文章从风、光电源以及电铁负荷并网点所允许的电压偏差出发,模拟量化分析风、光电源出力变化、电铁冲击负荷影响下无功电压运行风险;同时考虑大规模风、光电源脱网、送端系统直流闭锁故障因素影响下,讨论故障期间的暂态电压波动,以进一步分析无功电压运行风险。结果表明,电铁汇集点电压运行风险相对较大;风、光电源脱网下其750 k V节点影响不大,而220 k V节点电压风险较大,且随脱网容量加深其运行风险加重;直流双极闭锁下易导致换流站节点暂态过电压现象,使得电压运行存在一定风险。

英文摘要：

Cluster of wind-photovoltaic power supply、electrified railway load multipoint distribution and AC/DC hybrid transmission system combine in the same regional power grid, it was bound to have an impact on the stability of the intermittent energy system, especially the safe operation of the grid connected voltage. To ensure the safe and stable operation of intermittent energy system, this paper simulated and quantitatively analysised the operational risk of reactive voltage under the influence of wind-photovoltaic power supply output change and electrified railway impact load based on the voltage deviation allowed of wind-photovoltaic power supply and electrified railway impact load connected node. Taking into account the impact of large-scale wind-photovoltaic power off-grid and the sending system HVDC monopole block, the transient voltage fluctuation during the fault period is discussed in order to further analyze the operation risk of reactive voltage.The results show that voltage operational risk of electric iron apoptosis is relatively large; the 750 k V nodes have little effect of wind-photovoltaic power off-grid,but the 220 k V node voltage risk is larger, and with the increase of the capacity of offgrid to deepen its operational risk; HVDC monopole block easily cause transient overvoltage phenomenon of converter station node so that the operation of voltage exists a certain risk.