Post by amurman28 on Dec 18, 2023 2:17:37 GMT
From district.ce.cn/newarea/roll/201408/06/t20140806_3303258.shtml :
It is reported that high-voltage direct current (HVDC) transmission is a transmission method that rectifies three-phase AC power into direct current through a converter station, and then sends it to another converter station through a direct current transmission line and inverts it into three-phase AC power. It mainly solves the problem of high-voltage, long-distance and large-capacity power transmission. Compared with high-voltage AC transmission, high-voltage direct current transmission has economic advantages such as low line cost, saving land in line corridors, and low operating losses, as well as no system stability problems, asynchronous networking of AC systems, and improved system operation reliability. Other technical advantages.
It is reported that high-voltage direct current (HVDC) transmission is a transmission method that rectifies three-phase AC power into direct current through a converter station, and then sends it to another converter station through a direct current transmission line and inverts it into three-phase AC power. It mainly solves the problem of high-voltage, long-distance and large-capacity power transmission. Compared with high-voltage AC transmission, high-voltage direct current transmission has economic advantages such as low line cost, saving land in line corridors, and low operating losses, as well as no system stability problems, asynchronous networking of AC systems, and improved system operation reliability. Other technical advantages.
I have been studying Chinese DC lines for several years now. This screenshot shows the lines,
that I was able to recognize it on GE and draw it with “Path” placemarks.
Map of the HVDC and UHVDC power transmission lines
Transmission lines with different rated voltages (kV) are drawn in different colors.
Next, let's look at some of these DC projects in more detail.
In China, the first 500 kV High Voltage Direct Current transmission line is the Gezhouba - Shanghai ±500 kV HVDC Project,
which was completed and put into operation in 1989.
This project was designed to transfer electricity from the Three Gorges hydroelectric power station on the Yangtze River to Shanghai.
The HVDC transmission link is a ±500 kV bipolar line, 1,046 kilometers (650 mi) long, with a maximum power capacity of 1,200 MW.
The line starts at Gezhouba Converter Station in Yichang City, Hubei Province and ends at Nanqiao Converter Station in Fengxian District, Shanghai.
The HVDC Gezhouba - Shanghai transmission line runs through a rice field (Screenshot map.Baidu)
From Wikipedia:
Between 2008 and 2011 the towers of the most part of the HVDC Gezhouba - Shanghai transmission line, which were almost guyed towers capable of carrying two conductors,
were replaced by new free-standing line towers for 4 conductors in order to install the conductors for the HVDC Hubei-Shanghai on them.
Between 2008 and 2011 the towers of the most part of the HVDC Gezhouba - Shanghai transmission line, which were almost guyed towers capable of carrying two conductors,
were replaced by new free-standing line towers for 4 conductors in order to install the conductors for the HVDC Hubei-Shanghai on them.
runs from Jingmen CS (Jingmen, Hubei Province) to Fenjing CS (Jinshan, Shanghai) and has a transmission capacity of 3000 MW.
The HVDC Gezhouba - Shanghai and HVDC Hubei-Shanghai lines share towers along most of their track (Screenshot GE)
Ningdong-Shandong ±660kV HVDC Project is the world’s first one project at this voltage level. This transmission project was commissioned in 2011.
It starts from the Yinchuandong converter station (coal-fired generation in Ningxia) and ends to the Qingdao converter station on the East coast (Shandong).
The total length of T/L is 1335km, which via by way of five province (Ningxia, Shaanxi, Shanxi, Hebei, Shandong). This bipolar line has a rated capacity of 4000 MW.
This is important cross-regional power grid DC transmission project opened up the North channel from West China to East China.
Lingwu Power Plant, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
UHV AC 750 kV double-circuit transmission line "Lingwu Power Plant - Yinchuandong converter station", Road G307, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
UHV AC 750 kV one-circuit transmission line "Lingzhou substation - Yinchuandong converter station", Road G307, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
Yinchuandong converter station, Road G307, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
Suspension tower on Yinchuandong CS - Qingdao CS ±660kV HVDC bipolar transmission line, Road G307, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
Tension tower on Yinchuandong CS - Qingdao CS ±660kV HVDC bipolar transmission line, Ningxia Hui Autonomous Region (Screenshot map.Baidu)
Yunnan - Guangdong (YG) ±800kV UHVDC Project is a first ultra-high-voltage direct current link in the world operating at a transmission voltage of 800 kV.
It has a total length of 1,418 kilometres (881 mi) and runs from Chuxiong CS (Lufeng County in Yunnan Province) to Suidong CS (Zengcheng District in Guangdong Province)
From Wikipedia:
The first pole was put into operation in December 2009 with the second pole to follow in June 2010. The transmission system has a transmission capacity of 5,000 MW and a rated DC current of 3,125 A.
It transmits electricity from the hydropower plants in the Yunnan to the Guangdong, including cities of Guangzhou and Shenzhen.
The first pole was put into operation in December 2009 with the second pole to follow in June 2010. The transmission system has a transmission capacity of 5,000 MW and a rated DC current of 3,125 A.
It transmits electricity from the hydropower plants in the Yunnan to the Guangdong, including cities of Guangzhou and Shenzhen.
View from a bird's-eye view to the Chuxiong CS - Suidong CS ±800 kV UHVDC bipolar transmission line. Shanglin County, Guangxi Zhuang Autonomous Region (Screenshot GE)
The Chuxiong CS - Suidong CS ±800 kV UHVDC line runs on the mountains. Qingxin District, Guangdong Province (Screenshot GE)
Suspension tower on Chuxiong CS - Suidong CS ±800 kV UHVDC bipolar transmission line, road S2. Guangzhou, Guangdong Province (Screenshot map.Baidu)
Suspension tower on Chuxiong CS - Suidong CS ±800 kV UHVDC bipolar transmission line, road S2. Guangzhou, Guangdong Province (Screenshot map.Baidu)
Tension tower on Chuxiong CS - Suidong CS ±800 kV UHVDC bipolar transmission line, road G324. Guangzhou, Guangdong Province (Screenshot map.Baidu)
Several coal-based power plants have been built and are operating at Shengli coal field (Xilinhot City, Inner Mongolia).
Xilin Gol North Shengli is a 1.32GW lignite-fired power station.
(Photo by China Huaneng Group Company from nsenergybusiness.com)
In 2017, the Xilin Hot - Taizhou ±800 kV UHVDC project was commissioned to transmit electricity from these power plants to Jiangsu Province,
which is a major load center and one of the largest production centers in China.
From HVDC News China:
The ±800kV UHVDC Transmission line starts at the Ximeng converter station, which is located in the Inner Mongolia Autonomous Region and terminates at the Taizhou converter station,
crossing five provinces (Inner Mongolia, Hebei, Tianjin, Shandong, Jiangsu), and covering an overall distance at 1620km.
The ±800kV UHVDC Transmission line starts at the Ximeng converter station, which is located in the Inner Mongolia Autonomous Region and terminates at the Taizhou converter station,
crossing five provinces (Inner Mongolia, Hebei, Tianjin, Shandong, Jiangsu), and covering an overall distance at 1620km.
Xilin Hot - Taizhou ±800kV UHVDC Project is the first transmission project with hierarchical connection the inverter station to two AC systems (a 500kV and a 1000kV) in the world.
General view of Taizhou ±800 kV DC converter station/1000 kV AC substation. Taizhou city, east China's Jiangsu province. (Photo 18 September 2017 by ChinaImages)
From Xi'an Xidian Transformer Co., Ltd.:
The DC rated voltage of the converter station is ±800KV, which is combined with the Taizhou 1000 kV AC substation.
The project of Taizhou Converter Station adopted the world's first technology such as tiered access and AC/DC deep integration.
The DC rated voltage of the converter station is ±800KV, which is combined with the Taizhou 1000 kV AC substation.
The project of Taizhou Converter Station adopted the world's first technology such as tiered access and AC/DC deep integration.
Substation Taizhou CS/SS-1000/500 is a common link between Xilin Hot - Taizhou ±800kV UHVDC Project and Huainan-Nanjing-Shanghai 1000kV UHV AC Project.
The Huainan-Nanjing-Shanghai 1000 kV UHV AC double-circuit transmission line project starts from the Huainan 1000/500 kV substation in Anhui and ends at Huxi 1000/500 kV substation in Shanghai,
crossing Huaihe River and Yangtze River, with the power transmission capacity of 12 million kilowatts and total length of 759 km. Three ultra-high voltage substations 1000/500 kV (Nanjing, Taizhou and Suzhou)
are built in Jiangsu province.
The most important and unique part of this project is the Sutong GIL tunnel project that adopts UHV GIL technology. It is the world's first UHV AC 1000kV GIL integrated river-crossing pipe gallery.
The Sutong GIL integrated pipe gallery started construction in August 2016 and was officially put into operation in September 2019.
The Sutong GIL pipe corridor under the Yangtze River. Source: OurJiangsu.com
GILs (Gaz Insulation Line) are filled with sulfur hexafluoride (SF6) insulation gas to transmit power underground with minimum transmission losses.
The tunnel starts from the Nantong connection station in the north bank river and ends in Suzhou connection station in the south bank, with a total length of 5468.5 meters. The deepest point is 74.83 meters from the river surface.
The Sutong GIL comprehensive pipe gallery project also has two circuits of 500 kV cables and municipal general pipeline space such as communication and cable TV.
It is an ultra-long-distance GIL project with the highest voltage grade, the largest transmission capacity and the highest technical level in the world.
Several large coal-fired power plants have been built and are operating in the Wucaiwan mining area of Zhongdong coal field, Xinjiang Uygur Autonomous Region in north-west China.
Wucaiwan North 1st coal-fired 2.64 GW power plant. (Source: Wuhan East Lake High-tech Group Co.)
Simultaneously with the construction of these power plants, the construction of Changji - Guquan ±1100 kV UHVDC transmission Project facilities was carried out.
The Changji Converter Station ±1100 kV. (Source: nsenergybusiness.com/Guangdong Electric Power Design Institute)
Bipolar transmission line ±1100 kV of the Changji - Guquan UHVDC Project at the construction stage. (Source: ZMS Cable Company. Ltd)
The construction 225 m－high crossing tower at the south bank of the Yangtze River (Aerial photo Xinhua/Guo Chen)
Construction of this transmission project was started in January 2016 and completed in December 2018.
The Changji - Guquan ±1100 kV UHVDC power transmission line originates at the Changji (Zhundong) converter station in the Changji Hui autonomous prefecture of Xinjiang Uygur autonomous region in northwest China
and ends at the Guquan (Wannan) converter station in the southeast Anhui province in east China, passing through Xinjiang, Gansu, Ningxia, Shaanxi, Henan, and Anhui.
Changji - Guquan ±1100 kV UHVDC Project.kmz
Tension tower on the Changji - Guquan ±1100 kV UHVDC bipolar transmission line, road X010, Huangchuan County, Henan Province (photo by Hu Yibo from GE street view)
The Guquan converter station ±1100 kV DC/1000/500 kV AC. (Source: newsxc.com)
From The Journal of Engineering:
The ±1100 kV Changji–Guquan UHV DC project is hierarchically connected to the AC grid,
the HV-end converter transformers of both poles in Guquan converter station are connected to the 500 kV AC bus,
the LV-end converter transformers of both poles are connected to the 1000 kV AC bus
The ±1100 kV Changji–Guquan UHV DC project is hierarchically connected to the AC grid,
the HV-end converter transformers of both poles in Guquan converter station are connected to the 500 kV AC bus,
the LV-end converter transformers of both poles are connected to the 1000 kV AC bus
From NS ENERGY:
The Changji-Guquan ultra-high-voltage direct current (UHVDC) transmission line in China is the world’s first transmission line operating at 1,100kV voltage.
Owned and operated by state-owned State Grid Corporation of China, the 1,100kV DC transmission line also covers the world’s longest transmission distance and has the biggest transmission capacity globally.
The transmission line traverses for a total distance of 3,324km and is capable of transmitting up to 12GW of electricity.
The Changji-Guquan ultra-high-voltage direct current (UHVDC) transmission line in China is the world’s first transmission line operating at 1,100kV voltage.
Owned and operated by state-owned State Grid Corporation of China, the 1,100kV DC transmission line also covers the world’s longest transmission distance and has the biggest transmission capacity globally.
The transmission line traverses for a total distance of 3,324km and is capable of transmitting up to 12GW of electricity.
On September 25, 2013, the world's first double-circuit UHV project was put into operation. Construction of the Huainan–northern Zhejiang–Shanghai 1000 kV UHV AC transmission line began in October 2011.
This project is being used to transfer electricity generated in coal-rich Huainan, Anhui Province, to areas with high energy consumption in Eastern China.
This project is being used to transfer electricity generated in coal-rich Huainan, Anhui Province, to areas with high energy consumption in Eastern China.
The project starts from Huainan Substation in Anhui, crosses Huaihe River and Yangtze River successively, passes through Southern Anhui and Northern Zhejiang Substations, ends at Huxi Substation in Shanghai.
This UHV AC transmission link is a 1000 kV double-circuit line, 649 kilometers long, with a maximum power capacity of 8000 MW.
By the end of October 2012, the project has entered the most critical stage of crossing the Yangtze River, and the crossing towers constructed for this purpose is 277.5 meters high.
270 m－high crossing tower at the south bank of the Yangtze River
Suspension tower on "Northern Zhejiang SS – Husi SS" 1000 kV UHV AC double-circuit line, road S32(Shenjiahu Expy), Qingpu District, Shanghai (Screenshot map.Baidu_sv)
Tension tower on "Northern Zhejiang SS – Husi SS" 1000 kV UHV AC double-circuit line, near Husi SS, Qingpu District, Shanghai (Screenshot map.Baidu_sv)
In 2017, simultaneously with the construction of the Guquan converter station, as part of the Changji - Guquan ±1100 kV UHVDC transmission Project, a 1000 kV UHV AC double-circuit transmission line was built
from the Guquan CS to the already operating substation Southern Anhui SS, which is part of the Huainan - Zhejiang North - Shanghai 1000 KV UHV AC project.
