Power transmission and distribution network coordination planning method considering strong-weak relationship
A power grid, strong and weak technology, applied in the field of power system, can solve problems such as little consideration of transmission and distribution network coordination, difficulty in fully utilizing the power transmission and distribution network capacity, etc., to avoid excessive investment in construction, weaken the problem of electromagnetic ring network, and improve the reliability of power supply Effects on sex and safety
Active Publication Date: 2019-10-22
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Since power grids of different voltage levels are closely connected with each other and the transmission and distribution networks are mutually restricted, it will be difficult to fully utilize the transmission and distribution network capacity of the power grid by adopting the planning of hierarchical planning of each voltage level system and seldom considering the coordination between transmission and distribution networks.
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Embodiment 1
[0111] see figure 1 , a coordinated planning method for transmission and distribution networks considering the relationship between strength and weakness. This method takes a power grid in my country as an object (the power grid has 31 nodes, including 5 nodes of 500 kV, 2 nodes of power plants, and 24 nodes of 220 kV , the schematic diagram of its grid structure is shown in figure 2 shown), follow the steps below:
[0112] Step 1. After deleting the electrical connection equipment with a voltage level of 500 kV and above between the 500 kV nodes in the power grid, the admittance matrix Y between the nodes is established:
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[0115]
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[0118] In the above formula, when i≠j, Y ij is the mutual admittance between node i and node j, when i=j, Y ij is the self-admittance of node i, i=1,2,...,K, j=1,2,...,K, K is the total number of nodes with a voltage level of 500 kV and below in the grid to be planned, and M is the number of nod...
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The invention discloses a power transmission and distribution network coordination planning method considering a strong-weak relationship. The method comprises the following steps: firstly, establishing an electrical distance matrix S of 500 kilovolt nodes in a to-be-planned power grid, wherein the electrical distance matrix S is connected through a 220 kilovolt and below voltage level power grid;and dividing 500 kilovolt nodes into regions by adopting a clustering analysis method in combination with a basic principle of power grid partitioning, judging the strength grade of the 500 kilovoltnodes according to the magnitude of short-circuit current of the 500 kilovolt nodes, and finally planning a 220 kilovolt power grid for the strength grade of the 500 kilovolt nodes in different regions. According to the design, the power supply reliability and safety of the power grid are improved, the operation efficiency of the power transmission and distribution network is improved, and excessive investment construction of the power grid is avoided.
Description
technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for coordinating and planning a transmission and distribution network considering the relationship between the strength and weakness of the power grids at each voltage level. Background technique [0002] Scientific and reasonable power grid planning technology is a prerequisite for ensuring the safety, reliability and economy of the power system. As my country's economy enters a new normal, the development of my country's power grid has shifted from a period of high-speed development to a period of high-quality development. Power grid planning needs to make good use of the stock to revitalize the increase and give full play to the power transmission and distribution network capabilities of the power grid. In practice, people generally adopt the strategy of hierarchically planning each voltage level system, and use different methods for planning for powe...
Claims
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IPC IPC(8): G06Q50/06H02J3/00
CPCG06Q50/06H02J3/00H02J2203/20Y04S10/50
Inventor 刘巨李梦颖杨东俊杜治赵红生王博
Owner STATE GRID CORP OF CHINA