Grid equivalent method based on phase angle difference of call lines

A power grid equivalent and tie line technology, applied in the field of value, can solve the problem that the network equivalent simplification cannot be used, and achieve the effects of convenient related analysis and calculation, reduction of power grid scale, and good equivalent accuracy

Active Publication Date: 2014-11-26
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Application Information

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Problems solved by technology

In the case that the grid power flow calculation does not converge, it will not be possible

Method used

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  • Grid equivalent method based on phase angle difference of call lines
  • Grid equivalent method based on phase angle difference of call lines
  • Grid equivalent method based on phase angle difference of call lines

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example one

[0036] Such as figure 1 As shown, the grid equivalence method based on the phase angle difference of the tie line includes the following steps:

[0037] a) Divide the test grid into two sub-grids. Sub-grid A is composed of nodes 1, 2, 3, 4, 6, 7, 8, and 13, of which 4 and 8 are boundary nodes; Sub-grid B is composed of nodes 5, 9, 10, 11, and 12, of which 5 and 9 Is the boundary node; branch 4-5 and branch 8-9 are the tie lines between subsystems;

[0038] b) Suppose the voltage amplitude of all nodes in the power grid is 1, and use the DC power flow method to obtain the voltage phase angle θ of each node i (i=1,2,...13);

[0039] c) Calculate the line power on branch 4-5 according to the obtained DC power flow solution And line power on branch 8-9 will As equivalent injection power, connect to node 4 and node 8 respectively.

[0040] d) Obtain the grid equivalent network containing only the equivalent injected power of sub-grid A and sub-grid B, such as figu...

Example Embodiment

[0046] Example two

[0047] On the basis of the first embodiment, the system load level is gradually increased from 1.0 times to 3.0 times, the power flow calculation is performed on the grid after the equivalent value, and the approximate power flow result at this time is compared with the accurate power flow result before the equivalent value to obtain a table 2.

[0048] It can be seen from the results in the table that with the increase of load level, the voltage amplitude and phase angle errors of all nodes are within 4%, indicating that the proposed equivalent model and method have good performance under different load levels. Value accuracy.

[0049] Table 2 Comparison of power flow results of each node in sub-grid A under different load levels

[0050]

[0051]

[0052] The above calculation and analysis results show that the proposed equivalent model and calculation method can be used to approximate the local power grid when the accurate power flow solution of the power grid...

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Abstract

The invention discloses a grid equivalent method based on phase angle difference of call lines. The grid equivalent method particularly comprises the steps of dividing a grid into a plurality of sub-grids, obtaining approximate load flow solvability of the grid by means of a direct-current load flow method, calculating line power of the call lines among the sub-grids on the basis of the approximate load flow solvability, and equalizing the line power onto boundary nodes of a network needing retaining in a mode of power injection. By means of the direct-current load flow method, the approximate load flow solvability of the grid can be obtained under most of the conditions, the equivalent scheme does not depend on an accurate load flow result of the grid, and therefore, approximate static equivalence can be achieved under the conditions that load flow calculation of the grid is not convergent. In addition, an established equivalent model is good in equivalent accuracy.

Description

Technical field [0001] The invention belongs to the field of power system analysis, and more specifically, relates to a grid equivalence method based on the phase angle difference of tie lines. Background technique [0002] With the rapid development of my country’s society and economy, the scale of the power grid is expanding, the structure is becoming more and more complex, the load level is constantly increasing, and the operation mode is becoming more and more complex and changeable. Inconvenience caused by the planning and operation of the system. [0003] There are usually two possible reasons for the non-convergence of the power flow calculation: one is that some calculation data in the complex power grid are given incorrectly, which causes the power flow to be unsolvable, and the calculation is not converged in the calculation; the other is because of the expansion of the power grid Later, the commonly used Newton-Raphson method (Wang Xifan, etc., Modern Power System Analys...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 陈金富李智欢苏寅生孙鑫黄河徐光虎文汀姚海成
Owner CHINA SOUTHERN POWER GRID COMPANY
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