Analysis of Power System Affected by Extreme Weather and Its Adaptive Strategy

doi:10.12096/j.2096-4528.pgt.21059

Abstract

Abstract:

The impact of climate change on human society has attracted more and more attention, and the risk of power outage caused by a series of extreme weather is becoming more and more significant. In order to deal with climate change, especially extreme weather, human society needs to adopt two coping strategies of mitigation and adaptation. For the developing countries and small island countries, since climate change has already taken place, the climate problem will first be adaptation. In order to solve the problem of how the power system can fully adapt to climate change from all aspects, a power system development system adapted to climate change was established, and a construction method of power system development path covering extreme meteorological factors was proposed. On the basis of summarizing the impacts of various extreme weather on the power system, the vulnerability of power grid was evaluated. The overall strategy of adapting to extreme weather was studied, and the scheme of power system adapting to extreme weather events was proposed, namely planning-construction-emergency management-assessment (PCEA) disaster resistance system. In the planning stage, the study focused on the minimum power grid planning and built the minimum power grid backbone network without power outage. Based on the application examples in different stages of the scheme, it was verified that the PCEA system can make the power system better adapt to the extreme weather.

Key words: power system, climate change, extreme weather, minimum power grid planning, minimum power grid backbone network without power outage

CLC Number:

TM71

Geng LU, Jing DENG, Yuhong WANG, Jing CAO, Yunfeng YUE. Analysis of Power System Affected by Extreme Weather and Its Adaptive Strategy[J]. Power Generation Technology, 2021, 42(6): 751-764.

Figures/Tables 15

Fig.1 Mean temperature trends of global ocean surface and land

Fig.2 Temperature prediction in Asian land area

Fig.3 Global natural disaster frequency by type from 1970 to 2014

Fig.4 Landing times and frequency of tropical cyclones in China from 1949 to 2016

Fig.5 Changes of rainstorm and flood disasters in China from 1950 to 2010

Fig.6 Power system adaptation strategy chart

Fig.7 Minimum power grid planning for a coastal city frequently attacked by typhoon

Fig.8 Minimum power grid planning for a city with few typhoon

Fig.9 Application scheme of single conductor technology

Tab. 1 Comparison of wind protection retrofit schemes for 500 kV transmission lines in a city

现抗台风能力		改造后抗台风级(风速)
风级(风速)	输电线路占比/%	方案1	方案2(推荐方案)
13级下限(33.0~35.0 m/s)	7.3	16级中限(47.7~50.0 m/s)	15级上限(45.4~47.7 m/s)
13级中限(35.0~37.0 m/s)	14.7
14级下限(37.0~39.1 m/s)	72.0
14级中限(39.1~42.0 m/s)	6.0
改造工程投资/新建工程投资		53.4%	43.1%

Tab. 2 Comparison of wind protection retrofit schemes for 110~220 kV transmission lines in a city

现抗台风能力		改造后抗台风级(风速)
风级(风速)	输电线路占比/%	方案1	方案2(推荐方案)
13级下限(33.0~35.0 m/s)	4.5	15级上限(45.4~47.7 m/s)	15级下限(41.3~43.3 m/s)
13级中限(35.0~37.0 m/s)	38.7
14级下限(37.0~39.1 m/s)	50.3
14级中限(39.1~42.0 m/s)	6.5
改造工程投资/新建工程投资		44.1%	34.1%

Fig.10 Evaluation and thinking of disaster resistance system

Fig.11 Average outage time of customers from 2014 to 2016

Tab. 3 Power supply restored time in 2014-2016

项目	2014年	2015年	2016年
城区恢复供电平均时间/h	4	1.78	1.77
农村恢复供电平均时间/h	5	2.49	2.49

Fig.12 Comparison of improvement of grid structure

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