State Grid: Site planning, hijacking, "snails in the shells"

Open a national power grid plan, you will find that some substations and converter stations are built on the same site, and the power points are concentrated. There are also many UHV lines that use the same corridor channel to be parallel. Why is that? With such questions, the reporter interviewed the pre-grid workers. "An important starting point in our work in the pre-grid work is to achieve the harmonization of economic and social benefits. Finding the optimal balance between the two is the pursuit of our work." They gave such an answer.

In the preliminary work of the power grid project, there is such a widely circulated saying that “planning savings is the biggest savings”. The reporter consulted a large amount of data and data, and found that a power grid project, the cost savings in the construction process, is far less than the cost savings brought by the scientific research and reasonable power grid planning in the previous work, relying on solid research, visits, and feasibility study. more directly. The preliminary work of the power grid project can be adjusted according to the geographical position of the substation, the converter station and the line, and the layout can be rationally saved to save the power grid construction and operation and maintenance costs in the later period, so that the grid project can be put into operation and maximize the economic and social benefits.

Site planning

"Doing a dojo in the snail shell"

People often use the "snails in the snail shell" as a metaphor to make great things in a small space. After understanding the pre-work of the power grid project, you will find that all the pre-grid workers are masters of “doing the dojo in the snail shell”. In the site planning, they save as much space and public facilities as possible, and use the limited resources “on the cutting edge” to make the limited land, space, environment and capital “the biggest thing”.

In the preliminary work of the power grid project, there are hidden high-cost tricks everywhere. In the "Administrative Measures for the Pre-Work of the State Grid Corporation Power Grid", it is clearly stated: "In the preliminary work of the power grid project, the typical design, typical cost, general equipment should be vigorously implemented, the project cost should be strictly controlled, and the same tower double (multiple) back and large capacity should be adopted. Transformers, series compensation devices, substation miniaturization and other advanced and applicable technologies to save land, protect the environment, save energy and reduce consumption, and achieve the coordination of economic and social benefits."

Huainan-Nanjing-Shanghai 1000 kV AC UHV transmission and transformation project Taizhou 1000 kV substation is located in Nanshe Village, Doutou Town, Xinghua City. The Taizhou ±800 kV converter station was used as the receiving station for the Ximeng-Taizhou ±800 kV UHV DC transmission project. In August 2012, the feasibility study was started. However, at that time, there were no construction land indicators for new sites in Xinghua City. This has created a problem for the feasibility study staff. At first, the site of the converter station was selected in Yancheng City, which is located about 6 kilometers northeast of the Taizhou 1000 kV substation.

At that time, the idea of ​​"combining two into one" in the Taizhou 1000 kV substation and the ±800 kV Taizhou converter station emerged in the minds of researchers.

"Our consideration is to minimize land occupation and save resources." Huang Baoying, chief engineer of State Grid Economic Research Institute, recalled that UHV AC substations and DC converter stations have never been built. What are the benefits after the joint construction? What problems are brought about, and the villages near the existing sites are dense. If it is feasible to involve a large number of demolition, it needs to be studied carefully.

In June 2014, a total of 20 experts from the National Institute of Economics and Research and Design Institute of the system, substation, line and technology and other professionals gathered together to start working together to study the Taizhou 1000 kV substation and ±800 kV Taizhou The technical plan and design principles for the construction of the converter station. After the completion of the technical and economic comparative analysis of the sub-construction and construction projects, the State Grid Development Department and the State Grid DC Department, the Communication Department, the Infrastructure Department and the Transportation Inspection Department organized the State Grid Economic Research Institute, the Chinese Academy of Electric Power and related design units. The joint working group conducts a number of overall optimization designs to clarify the detailed design principles associated with the joint construction. After repeated research and discussion, it was finally determined that the Taizhou ±800 kV converter station and the Taizhou 1000 kV AC substation were constructed in the joint site of Xinghua City, Taizhou. In October of the following year, the Taizhou ±800 kV converter station adopting the joint construction plan was officially approved by the National Development and Reform Commission.

Huang Baoying introduced that compared with the two-station construction, the Taizhou 1000 kV substation and the Taizhou ±800 kV converter station can save at least 2 hectares of land, the number of equipment and water source, power supply, roads, station buildings, control and protection, etc. The amount of work has been reduced. “After the construction, the project can save resources and save investment costs.” Huang Baoying said, “Ensuring that every project has good social and ecological benefits from the source is the natural mission of the pre-work of the power grid project. The value of the job."

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