中文摘要：

我国电力系统正在形成交直流互联的巨大网络,交直流系统操作及故障、直流换流阀的动作、负荷变化产生的ns、μs、ms级的电磁暂态将在直流系统和交流系统中交互作用,交直流互联系统的电磁暂态交互作用可对交流系统和直流系统构成危害,特别是导致直流系统的换相失败及闭锁等严重事故。鉴于此,采用理论分析及测试相结合的方法建立基于地上交直流互联电网络、控制系统和地下接地系统的全波过程的特高压系统电磁暂态精确分析方法,并重点对交直流互联系统的交流侧利用Ward等值法进行系统等值,考虑了冬大/冬小/夏大/夏小等多种运行方式,并对交直流系统进行稳态调试,为分析交直流互联系统电磁暂态交互作用打下基础。

英文摘要：

The interaction of nanoseconds,microseconds,milliseconds electromagnetic transients due to AC-DC system operation and fault,the DC converter valve movement,the load generated by changes in the interaction of AC-DC interconnected system electromagnetic transient,can pose a hazard on AC and DC power systems,in particular,lead to the commutation of DC system failures and artesian such serious incidents.Combining theoretical analysis with test,we can establish the analysis method of electromagnetic transient of the full-wave process of the UHV system based on AC-DC interconnected system,control systems,and underground grounding system,and focus on the equivalence circuit of AC side network with the Ward method of equivalency under many operation modes and steady-state debugging for the analysis of AC-DC interconnected system,so as to lay the foundation for the interaction of electromagnetic transient.