特高压接入大型城市500kV电网适应性分析及应对策略

为支撑西部、北部大型风光新能源基地的开发和资源送出,西电东送、北电南送特高压直流输电通道在未来将会进一步拓宽。特高压直流的汇入会对受端大型城市500 kV电网潮流、动态稳定性和短路电流等产生重要影响。提出一种特高压接入受端电网的适应性综合分析方法,能够系统评估特高压直流接入对大型城市500 kV电网的影响。以我国某大型城市500 kV电网为例,系统分析特高压电网接入后该城市500 kV电网的适应性。针对特高压接入后该500 kV城市电网出现的短路电流超标问题,提出了改变电网结构和改变线路参数两种短路电流限制措施,仿真结果验证了两种措施限制短路电流的有效性。

Adaptability Analysis of UHV Interconnection to Metropolitan 500 kV Power Network

In order to support the exploitation and power delivery of the large-scale wind and solar power bases located in the Eastern and Northern Areas, a lot more west to east and north to south ultra-high voltage direct current (UHVDC) power transmission projects will be built. Interconnection with UHVDC network will impact the power flow, dynamic stability and short-circuit current level of the metropolitan 500 kV power grid. A systematic methodology to evaluate the impact of interconnection with UHVDC on metropolitan 500 kV network is proposed. To handle the problem of short-circuit current over-limitation, two measures are proposed to change the grid structure and the line parameters, respectively. The simulation results validate the effect of both the measures in limiting short-circuit current caused by UHVDC interconnection.