Construction method of UHV power transmission grid structure scheme for large-scale energy base
A technology of power grid structure and construction method, applied in resources, data processing applications, forecasting, etc., can solve problems such as limited power transmission, weak temporary stability ability, and weak voltage support ability of energy bases, so as to avoid adverse effects and control flexibly Effect
Active Publication Date: 2021-08-17
STATE GRID CORP OF CHINA +2
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Problems solved by technology
In the early stage of UHV construction, the grid structure has not yet been formed. If the UHV substation and the ultra-high voltage power grid at the sending end are connected by AC lines, the short-circuit current level of the original power grid at the sending end may exceed the breaking capacity of the switch, and may also be sent to the outside of the power grid at the sending end. If the UHV substation is not interconnected with the UHV power grid at the sending end, the voltage support capability is weak, and there is also the possibility that the power transmission of the energy base is limited due to the weak temporary stability capability
Method used
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Embodiment 1
[0045] According to the planning report of a sending-end power grid, clearly study the construction progress of the UHV power grid in the horizontal year and the generator commissioning of the sending-end UHV power grid, and initially determine the abundant power of the sending-end power grid through the balance of power and electricity, and then initially set the DC The back-to-back capacity is 1000MW and 1500MW respectively. According to the ultra-high voltage sending-end power grid construction plan and considering the sustainability of the plan, it is determined that the DC back-to-back AC drop point can be initially selected as image 3 The ultra-high voltage substation A or E in , thus, the structure scheme set of ultra-high voltage power transmission grid for large-scale energy base can be constructed as follows:
[0046] Option 1: The DC back-to-back capacity is 1000MW, and the DC back-to-back AC drop point is substation A;
[0047] Scheme 2: The DC back-to-back capac...
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The invention discloses a construction method of a large-scale energy base UHV power transmission grid structure scheme, comprising the following steps: 1) constructing an initial model of a large-scale energy base UHV power transmission grid; 2) determining 2-3 DC back-to-back capacity value; 3) determine 2‑3 DC back-to-back AC placement schemes; 4) obtain a number of planning grids, and then use each planning grid as a primary selection scheme to construct a primary selection scheme set; Electrical performance analysis; 6) When the preset requirements are not met, delete the planned network frame from the primary selection scheme set; 7) When the primary selection scheme set is empty after step 6), go to step 2) ; Otherwise, then go to step 8); 8) carry out economical analysis to each planned network frame in the primary selection scheme; 9) select the optimal planned network frame according to the multi-objective optimization planning model, and this method can synthesize electrical performance and economy to realize the construction of the power grid structure scheme.
Description
technical field [0001] The invention belongs to the field of power grid development and planning, and relates to a construction method of a large-scale energy base ultra-high voltage power transmission grid structure scheme. Background technique [0002] The distribution of my country's energy resources is extremely uneven. Nearly two-thirds of the country's developable hydropower is distributed in the three provinces (regions) of Sichuan, Yunnan, and Tibet in the west, and nearly two-thirds of the coal reserves are concentrated in Shanxi and Inner Mongolia in the north and northwest of my country. The three provinces (regions) of Shaanxi and Shaanxi have formed large-scale hydropower bases and coal power bases. my country's energy resource distribution and economic development are inversely distributed, which determines the inevitability of large-scale cross-regional flow of energy and electricity. The transmission capacity of ultra-high voltage lines will be limited by the...
Claims
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IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06
CPCG06Q10/04G06Q10/06315G06Q50/06Y04S10/50
Inventor 吉平严欢姜宁张鑫杨海涛王喆宋云亭郑超
Owner STATE GRID CORP OF CHINA