特高压串补装置平台的开关操作瞬态电磁特性仿真研究(英文)

Simulation of Electromagnetic Transient Characteristics on Platform of 1 000 kV Fixed Series Capacitors due to Switching Operation

特高压串补装置的旁路间隙和隔离开关操作时,都会在高电位平台上产生瞬态电磁现象,包括一次系统过电压及对二次系统的电磁干扰。为研究其瞬态特性,结合有限元法和时域部分元等效电路法,首先在串补装置缩微模型和真型试验平台上验证了建模方法的正确性,其次仿真了旁路间隙击穿和隔离开关操作时在平台上产生的一次系统过电压、平台电位升和二次系统电磁骚扰。为了抑制旁路间隙击穿在平台上产生的一次系统过电压,评价了一种过电压抑制方案的有效性,并已经在工程中成功应用。同时,对仿真结果的应用进行了分析和探讨。

Sparkover of the bypass gap and isolation of the disconnecting switch on the 1 000 kV fixed series capacitors （FSC） platform will cause electromagnetic transient phenomena including transient overvoltage in the primary equipment circuit and induce electromagnetic interference （EMI） into the secondary circuit on the platform. To investigate the electromagnetic transient characteristics, a simulation method incorporating the 3-D finite element method （FEM） and the time-domain partial-element equivalent circuit （PEEC） was presented and verified based on the reduced-size experimental model and the life-size 1000kV FSC experimental platform. Simulation results of the overvoltage, platform potential rise （PPR） in primary circuit and disturbance in the secondary circuit on the platform due to bypass gap sparkover and disconnecting switch operation were obtained with the method. To mitigate the overvoltage in the primary circuit on the platform due to bypass gap breakdown, a suppressing scheme was evaluated and already implemented in actual 1 000kV FSC projects. Further application aspects of simulation results were analyzed and discussed as well.