Method for simplifying electric network based on power transfer distribution factor
A distribution factor and power transfer technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as large power flow errors
Inactive Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology
At present, there have been many methods trying to use DC power flow to simplify the power flow calculation of the network. However, the existing methods all depend on the operating point of the system. Even if the simplified network is in the same congestion situation as the original network, the power flow The error is also larger
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[0107] The power grid simplification method based on the power transfer distribution factor of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:
[0108] The method based on the power transfer distribution factor of the present invention comprises the following steps:
[0109] 1) Structural characteristic description of power transfer distribution factor
[0110] The L×N dimensional power transfer distribution factor matrix H links the active power flow with the active power injection, and the active power injection is the control variable of the optimal power flow. In the DC power flow mode, the linear relationship between the active power flow and the active power flow and the voltage phase angle θ is:
[0111] P inj =B bus θ (1)
[0112] P flow =B branch Cθ
[0113] Among them, B bus is a non-full-rank matrix, which can be obtained by solving equation (1) after selecting the reference bus.
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The invention relates to a method for simplifying a large-scale electric network based on a power transfer distribution factor. The method is characterized by comprising the steps of describing the structural characteristics of the power transfer distribution factor; describing a simplified power transfer distribution factor matrix Hr; and describing Hr properties, and the like. The method disclosed by the invention can be used for solving the problem of load flow calculation of simplifying a large-sized electric system into a small-sized system by sufficiently utilizing the advantage of easiness in calculation of the power transfer distribution factor with direct-current load flow, the load flow of the simplified system and original load flow have same results, the method can be used for the simplified calculation of large-scale electric system planning, is scientific, reasonable, simple and applicable, is capable of accurately expressing the original network result without depending on the load flow calculation result of a network operation point and has effectiveness and applicability.
Description
technical field [0001] The invention relates to a grid simplification method based on a power transfer distribution factor, which is used to simplify the planning calculation of a large-scale power system. Background technique [0002] With the growing concern about climate change issues, the grid integration of renewable energy is increasing. In order to optimize the generation and transmission networks, large-scale grid expansion planning algorithms have been further developed, however, the calculation of large-scale power system master planning is extremely challenging, so its computational load can be greatly improved by using small, equivalent networks. decrease. [0003] The simplification of the network can be achieved by eliminating unnecessary components and calculating the impedance matrix of the simplified network. However, this simplification will produce a high-density impedance matrix, so that the simplified network cannot improve the computational efficiency....
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 郭健段金君于永忠韩璐刘玉剑闫晶韩洁平王燕涛
Owner STATE GRID CORP OF CHINA