Decoupling power flow calculation method for flexible DC power grid-containing AC-DC hybrid power grid
An AC-DC hybrid and power flow calculation technology, which is applied to AC networks with the same frequency from different sources, etc. It can solve problems such as difficult programming, power flow solution oscillation, and many iterations, achieving a wide range of applications and fast calculation speed. , the algorithm has good convergence effect
Inactive Publication Date: 2018-11-30
SHANDONG UNIV +3
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[0004] (1) The unified iterative method has good convergence and fewer iterations; however, it has the following defects: (a) it cannot be combined with existing commercial software, and programming is difficult; (b) Jacques needs to be recalculated after each iteration than the matrix, which increases the amount of calculation
[0005] (2) Alternate iterative method is easy to interface with existing commercial software, programming is simple, and its calculation speed is fast. Different algorithms can be used in the DC part and the AC part; however, there are also the following problems: (a) the initial value of the AC-DC system The given requirements are high and the convergence is poor, which will easily cause the oscillation and non-convergence of the power flow solution; (b) in the power flow calculation, the loss of the converter and the injected power of the balance converter station cannot be accurately obtained in a single power flow calculation Knowing that this leads to an increase in the number of iterations
[0007] Although the above two documents both decouple the power flow calculation of the DC power grid from the power flow calculation of the AC power grid and the converter station, and solve the defects of the alternate iteration method, the above two documents both have the power flow calculation of the AC power grid and the power flow calculation of the converter station. The problem that still needs to be realized by alternating iterations
[0008] To sum up, the existing decoupling power flow calculation methods for AC / DC hybrid power grids all need to be implemented alternately and iteratively, and the number of iterations is large, which affects the speed and efficiency of the entire decoupled power flow calculation.
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[0044] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0045] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0046] In order to solve the problems existing in the decoupling power flow calculation method of the existing A...
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The invention discloses a decoupling power flow calculation method for a flexible DC power grid-containing AC-DC hybrid power grid. The decoupling power flow calculation method comprises the steps of(1) dividing an AC power grid and a DC power grid by taking a bus at a DC side of a converter station as a boundary; and (2) completely decoupling power flow calculation of the AC power grid and the DC power grid, and sequentially solving DC power grid power flow and AC power grid power flow which are completely decoupled, wherein the Jacobian matrix is constant and unchanged during the process ofsolving the DC power grid power flow. The method is good in convergence and rapid in calculation speed.
Description
technical field [0001] The invention belongs to the field of grid power flow calculation, and in particular relates to a decoupling power flow calculation method for an AC / DC hybrid grid including a flexible DC grid. Background technique [0002] As a more flexible, convenient and safe new energy transmission method, the Voltage Source Converter-Multi-Terminal HVDC (VSC-MTDC) system has attracted extensive attention in recent years. VSC-MTDC can realize multi-source power supply, multi-drop power receiving, isolated island power supply, etc., and has broad application prospects in the fields of wind power and other new energy grid connection, construction of urban DC distribution network and other fields. For the AC / DC hybrid system including VSC-MTDC, the power flow calculation is an important part of the analysis of steady-state operation characteristics, and it is also the basis for the study of transient characteristics and protection control. [0003] The power flow ca...
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Login to View More IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor叶华高仕林刘玉田赵贺李子衿杜延菱刘海涛
OwnerSHANDONG UNIV