The Key to Economic Transformation in Shanxi: UHV Opens a New Channel for "Jindian Power Transmission"

The Key to Economic Transformation in Shanxi: UHV Opens a New Channel for "Jindian Power Transmission" On December 16th, the world’s highest voltage, highest transmission capacity, and most advanced technological level of the AC transmission project—the 1000-kV Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project project was formally put into operation. , Full-voltage, large-capacity transmission, the maximum transmission power of 5.72 million kilowatts. Zhang Jiankun, general manager of Shanxi Electric Power Co., Ltd. recently said in an interview with the “Liangbao” reporter that after the expansion project was formally put into operation, the transport capacity and secondary pollution caused by the transport of tens of millions of tons of coal per year in Shanxi will be effectively mitigated. Less electricity in the southern region is equivalent to the addition of five million kilowatts of installed power plants. The expansion project has broadened the “electricity highway” and broadened the broad road to the scientific development of energy resources in Shanxi Province.

Scientifically Layout of UHV Construction “Lingbao”: The UHV AC pilot demonstration project expansion project was formally put into operation, which is of great significance for the large-scale development of UHV in China and the transformation of energy and power development modes. As the starting point for the expansion project, Shanxi Province will also be an important power transmission resource base and an important power transmission base in the country. How will the UHV construction plan be planned during the “Twelfth Five-Year Plan” to help the province's energy economic transformation to leapfrog development?

Zhang Jiankun: Shanxi is the starting point of the expansion project. In the entire project, the provincial power companies closely cooperate with each other from the aspects of dispatching, infrastructure, and production to ensure the smooth operation of the project.

Shanxi is known as the “Coal Sea”. Of the 14 large-scale coal bases approved by the state, Shanxi has occupied three parts of Shanxi Province, Jinzhong, and Jindong. At the end of last year, Shanxi Province was approved by the State Council to set up a “comprehensive reform pilot zone for national resource-based economy transformation”. In the overall plan for comprehensive reform and experimentation, "transmission of coal for transmission" is an important part, with particular emphasis on increasing the ability of coal resources to be transformed locally. During the “Twelfth Five-Year Plan” period, Shanxi Electric Power Company will closely focus on the overall development and overall planning of the three major coal bases, scientifically and rationally, and deploy it to vigorously develop the UHV power grid and increase the pace of the delivery of Jin Electric Power.

In the north of Shanxi Province, there are Datong coalfields and Ningwu coalfields. We plan to construct 1,000 kV UHV stations in the Jinbei area and form the “Northern” channel in the national UHV power grid planning: Northern Shaanxi—Northern Shanxi—Shijiazhuang—Jinan—Weifang 2 back to the UHV line, the Jinbei coal-electric power base (initiative power supply installed capacity of 18.92 million kilowatts) power brought together in the North Shanxi UHV station, through the UHV "North Transverse" channel sent to Hebei, Shandong power grid.

In Jinzhong, part of the Xishan coalfield and the Qishui coalfield, we plan to build a 1,000-kV Jinzhong-UHV station and form the “Zhongheng” channel in the national UHV grid plan: Jingbian-Jinzhong-Northern Henan The Xuzhou-Lianyungang two-circuit UHV line will bring the Jinzhong Coal-fired Power Base (which has an initial installed power capacity of 18.4 million kilowatts) into the Jinzhong UHV station, and send it to Henan and Jiangsu power grids through the UHV “Zhongheng” channel.

In the southeastern Shanxi Province, there are most of the Huoxi coalfields, the vast majority of the Qishui coalfields, and a large number of small coal fields, and their coal reserves are very abundant. At present, the expansion project of the 1,000 kV Changzhi Substation has already been partially completed. In the future, the “western vertical” channel in the national UHV grid plan will be formed: Mengxi-Jinzhong-Jindongnan-Nanyang-Jingmen-Changsha 2 to 3 UHV lines. The southeastern coal-electric power base (which has an initial installed power capacity of 40.4 million kilowatts) was brought together in the southeastern Shanxi UHV station and sent to Henan, Hubei, and Hunan power grids via the UHV "West-Longitudinal" channel.

By 2015, relying on the three major coal and electricity bases in Shanxi, Jinzhong, and Jindong, Shanxi will fully build three UHV transmission lines, namely “Western Longitudinal”, “Northern Transverse” and “Zhongheng”, plus existing ones. Four 500 kV network-to-network transmission channels (transmission capacity of 11 million kilowatts) and one 500 kilovolt point-to-network transmission channel (transmission capacity of 3.3 million kilowatts) will have a power transmission capacity of 50.1 million kilowatts.

The UHV has opened a new channel for “Jinan Power Transmission” “Lingbao”: At present, how is the delivery of the Jindian power transmission carried out? What areas will be specifically transported to?

Zhang Jiankun: Shanxi Power Grid is an external transmission type power grid. During the “Eleventh Five-Year Plan” period, the completion of one UHV and nine 500-kV delivery routes put Jindian’s outbound delivery scale rapidly. At present, Shanxi Power Grid has two power transmission channels: three 500 kV lines from Datong Second Power Plant to Fangshan, two 500 kV lines from Baotou Second Power Plant to Baotou, and two 500 kV lines from Yangquan to Shibei. Two 500 kV lines from the city to Xin'an and one 1000 kV line from Jinyang to Nanyang to Jingmen; a 3.3-million-kw unit from Yangcheng Power Plant transmits electricity to Jiangsu in a point-to-network manner; through the 220 kV substation in Baode, Zhangzhou 110 kV was sent to Shaanxi Yulin.

As of the end of November, the province’s cumulative electricity transmission capacity was 61.648 billion kwh, of which the electricity output from the UHV was 3.834 billion kwh. It will continue to transmit electricity through the 500-kilovolt West-East Electricity Transmission Channel to the Jing-Jin-Tanggu area, transmit electricity to Jiangsu Province via a 500-kV point-of-internet network, and deliver electricity to Henan Province and Hubei Province in central China through the UHV power grid. It is estimated that by the end of this year, the installed capacity of new grid-connected power generation in the province will reach 8.253 million kilowatts, and in 2012, the new production capacity is expected to reach 6.27 million kilowatts.

As early as 2009, the Shanxi Provincial Government signed strategic cooperation framework agreements with the two provincial governments of Shandong and Hunan, and signed a strategic cooperation memorandum with the Jiangsu Provincial Government. During the “Twelfth Five-Year Plan” period, it is planned to transfer 10 million kilowatts of electricity to the three electricity-producing provinces through the UHV to a total of 30 million kilowatts of electricity load, and realize the conversion of 50 million tons of raw coal per year.

The "Twelfth Five-Year Plan" is a crucial period for the leap-forward development of Shanxi Province. UHV power transmission can be said to open up a new channel for the Sino-Singapore coal transportation, which greatly eases the severe situation in which the transportation capacity of highways and railways is strained. Facts have proved that the successful commissioning of the UHV AC pilot demonstration and expansion project has provided a high-speed channel for the transformation and development of Shanxi's energy economy and played an important role in optimizing the allocation of resources. As an air platform for Shanxi's opening to the outside world, UHV will certainly play an increasingly important role in accelerating the leap-forward development of Shanxi's transformation and realizing the transformation and development of a large coal province to a “three-dimensional energy center”.

Actively support coal-bed methane power generation and grid “Lingbao”: In the core work of “coal-based, diversified development” in Shanxi Province, CBM has become the first key promotion work for new energy development, proposed by the provincial party committee and the provincial government. The overall goal of “gasification Shanxi” is to plan to mine 50 billion cubic meters of CBM during the “12th Five-Year Plan” period. How does the Shanxi Electric Power Company carry out power generation and grid connection after the development of CBM?

Zhang Jiankun: CBM is often referred to as “gas” and is mainly composed of methane gas. The combustion produces only eighty-one percent of coal, and CBM power generation is of great significance in protecting the environment and saving energy and reducing emissions.

Shanxi Province is rich in coalbed methane resources, and its reserves account for one-third of the national total. It has been listed as the focus of national coalbed methane resource development. In 2010, the coalbed methane extraction amounted to 4.4 billion cubic meters, accounting for 61% of the total amount of national extraction, and the utilization rate of coalbed methane reached 40%, ranking first in the country.

As of the end of November this year, the province's installed coal-bed methane power generation capacity was 380,900 kilowatts, accounting for 0.78% of the province's installed capacity. It is estimated that the total installed capacity by the end of the year will reach 399,900 kilowatts. According to the “12th Five-Year Development Plan for Emerging Energy Industry in Shanxi Province” (draft for solicitation of opinions), by the end of the “Twelfth Five-Year Plan”, the installed capacity of coal-bed methane power generation reached 6 million kilowatts.

Current CBM power generation also has some problems. First of all, due to the limitation of the total amount of gas source and the means of collection, the source of coalbed gas is not stable, resulting in unstable operation of the generator set, frequent startup and shutdown of the unit, and frequent overhaul, affecting the safety of the grid. Secondly, at present, most CBM power plants are connected to the grid with a 10 kV line. Due to the large number of power stations and small capacity, numerous grid-connected CSG power stations are connected to the grid to increase the number of grid connection points, and they are occupying a large number of public transformer substation spacing resources and line corridors. Power transmission and distribution resources are in short supply. Thirdly, CBM power generation has not been included in the national renewable energy price surcharge subsidy range, and the renewable energy tariffs charged to users in the province have been uniformly deployed throughout the country, which cannot fully solve the problem of clean energy development in the province. In addition, renewable energy supplements (funds) are balanced across the country, and the current policy subsidy standards are too low to meet the needs of grid engineering construction investment and operation and maintenance.

Shanxi Electric Power Company actively supports the development of clean energy and renewable energy including CBM. On the one hand, it provides reliable power supply guarantee for construction and operation, and actively creates conditions for CBM power generation and grid connection. On the other hand, it timely signed contracts for the sale and purchase of electricity with power generation companies, fully acquired the on-grid electricity generated by CBM within the scope of the national grid, and cooperated with the state's renewable energy tariffs to allocate additional electricity, and paid for the on-grid electricity charges in full and on time.

In order to ensure the safe and reliable operation of the power grid, in terms of grid connection, the CBM power supply safety management will be strengthened. Reasonably determine the power grid connection method and grid-connected voltage level to ensure the balance of power on the ground, effectively reduce the loss of power grids and the flow backwards; strengthen the management of coal-fired power plant grid equipment, especially secondary equipment (protection, communications, etc.), from The grid-connected equipment and technical requirements are taken into consideration to effectively ensure the safety, reliability, stability, and economic operation of the power grid and power plant. At the same time, strengthen the coal-bed gas power grid management. The coal bed methane power plant with an installed capacity of more than 5 megawatts adheres to the “one-point grid connection” and multiple accesses to the system in the same tower to avoid the waste of corridor resources. The coal bed methane power plant with an installed capacity of less than 5 megawatts is dispersedly connected to the power grid in accordance with the principle of distributed power access system, and has strong flexibility and mobility.

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