In 2020, there will be 5 UHV DCs fed into Central China.

State Grid Co., Ltd. recently released the "Zhumadian-Wuhan 1000 kV UHV AC Transmission and Transformation Project Environmental Impact Report (for review)", by 2020, the four Middle East China (Hubei, Hunan, Henan, Jiangxi) will Formed 2 times in Henan, 1 in Hubei, Hunan, and Jiangxi, each with a total of 5 ± 800 kV, 8000 megawatts of high-voltage DC feeding power transmission pattern, which guarantees UHV DC safe and stable power transmission to Central China Power Grid, building Huazhong The UHV "Day" type AC ring network project is very necessary.

The five UHV DCs are in the Haminan-Zhengzhou, Jiuquan-Hunan UHV, the Qinghai-Henan UHV under construction, the Shaanxi-Hubei UHV approved in January this year, and the Yazhong, which is about to be approved. Jiangxi UHV.

The five UHV DCs are in the Haminan-Zhengzhou, Jiuquan-Hunan UHV, the Qinghai-Henan UHV under construction, the Shaanxi-Hubei UHV approved in January this year, and the Yazhong, which is about to be approved. Jiangxi UHV.

Among them, Zhumadian-Wuhan UHV AC project is a supporting project of Qinghai-Henan UHV DC transmission project and an important part of Huazhong UHV AC ring network. The construction of the project is in line with the overall plan of Central China Power Grid, which will improve the inter-provincial power exchange capacity between Hubei and Henan and the power-receiving capacity outside the region, laying the foundation for the operation of the rated power of Qinghai-Henan, Shaanxi-Wuhan and other UHV DCs. Limit the short-circuit current level of the Central China Power Grid and create conditions for the interruption of the inter-provincial 500 kV grid.

The starting point of the Zhumadian-Wuhan UHV exchange project is the 1000 kV Zhumadian substation in Shangcai County, Zhumadian City, Henan Province. The end point is the 1000 kV Wuhan Substation in Xinzhou District, Wuhan City, Hubei Province, and the entry into Zhumadian City and Xinyang City of Henan Province. Huanggang City, Hubei Province, Wuhan City, with a total length of 286.5 kilometers. The 1000kV outlet interval project of Zhumadian Substation and Wuhan Substation is in the new construction of Zhumadian-Nanyang UHV AC Project Zhumadian Substation and Jingmen-Wuhan UHV AC Project Wuhan Substation. The project is scheduled to start in October 2019 and will be completed and put into operation in December 2020.

It is understood that in September 2018, the "Notice on Accelerating the Planning and Construction of a Batch of Key Projects for Power Transmission and Transformation" issued by the National Energy Administration (hereinafter referred to as "Notice") revealed that it is supporting the Qinghai-Henan UHV DC project. , will build Zhumadian - Nanyang, Zhumadian - Wuhan UHV exchange project. In March of this year, the Zhumadian-Nanyang UHV AC project has started construction.

At the same time, the "Notice" clarifies that the North Shaanxi-Hubei UHV DC project will be located in Wuhan, which will support the construction of the Jingmen-Wuhan UHV AC project; the Yazhong-Jiangxi UHV DC project will be located in Nanchang, and will be built in Nanchang-Wuhan and Nanchang. - Changsha UHV AC project. At the same time, the "Notice" also called for the promotion of the 1000 kV Nanyang-Jingmen-Changsha double-return UHV exchange project. These UHV projects will form an "U"-shaped Huazhong UHV AC ring network covering Nanyang, Zhumadian, Wuhan, Jingmen, Nanchang and Changsha with the 1000 kV Jindongnan-Nanyang-Jingmen UHV exchange project in operation.

By: JUCRO Electric (Focus on Vacuum Interrupter, Vacuum circuit breaker, Vacuum contactor , Current/Voltage transformer, SF6 Circuit Breaker, Isolation Switch and Switchgear)

2019.8.31