特高压接入大型城市500 kV电网适应性分析及应对策略

doi:10.12204/j.issn.1000-7229.2021.07.007

摘要/Abstract

摘要：

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。

关键词: 特高压电网, 适应性分析, 动态仿真, 短路电流限制

Abstract:

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.

Key words: ultra-high voltage network, adaptability analysis, dynamic simulation, short-circuit current limitation

中图分类号:

TM72

宋福龙, 余潇潇. 特高压接入大型城市500 kV电网适应性分析及应对策略[J]. 电力建设, 2021, 42(7): 58-64.

SONG Fulong, YU Xiaoxiao. Adaptability Analysis of UHV Interconnection to Metropolitan 500 kV Power Network[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(7): 58-64.

图/表 12

图1 特高压接入某大型城市电网简化示意图

Fig.1 Simplified illustration of UHV interconnection to a metropolitan transmission network

图2 该大型城市电网主网架

Fig.2 Illustration of the 500 kV backbone network of the metropolitan transmission grid

图3 大型城市电网对特高压接入的适应性系统评估流程

Fig.3 Evaluation flow of the adaptability of UHV interconnection

图4 特高压站—E站500 kV线路N-1故障时, 线路功率变化量

Fig.4 Power fluctuation when “ N-1” fault happens on the lines between UHV and 500 kV substation E

图5 特高压站—E站500 kV线路N-1故障时, E站500 kV母线电压变化情况

Fig.5 500 kV bus voltage fluctuation of substation E when “ N-1” fault happens on the lines between UHV and 500 kV substation E

图6 特高压站—E站线路N-2故障, 特高压站—C站线路功率变化量

Fig.6 Power Fluctuation when “ N-2” fault happens on the line between UHV and 500 kV substation E

图7 受端电网短路电流简化计算模型

Fig.7 Illustration of the short-circuit current calculation model of the metropolitan network

表1 特高压站对该大型城市东部电网500 kV侧短路电流影响

Table 1 Short-circuit current of 500 kV network influenced by UHV interconnection

图8 断开F电厂—E站单回线限制短路电流措施示意图

Fig.8 Illustration of the short-circuit current limitation strategy by opening the interconnection between power plant F and substation E

表2 断开F电厂—E站500 kV线路,该大型城市东部电网短路电流水平

Table 2 Short-circuit current of the 500 kV network influenced by UHV interconnection when power plant F is isolated from substation E

图9 加装串联电抗器限制短路电流示意图

Fig.9 Illustration of the short-circuit current limitation strategy by adding serial reactor

表3 加装串联电抗器,东部500 kV电网短路电流水平

Table 3 Short-circuit current of the eastern 500 kV network influenced by UHV interconnection when serial reactor is added

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