Polar coordinate Newton method load flow calculation method for Jacobian matrix change
A technology of power flow calculation and matrix change, applied in the direction of calculation, complex mathematical operation, instrument, etc., can solve the problems of long running time, complex algorithm logic, high power at the end point of small impedance branch, etc., to achieve less running time, simple logic, The effect of improving calculation speed
Pending Publication Date: 2020-04-21
DALIAN MARITIME UNIVERSITY
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[0088] According to the analysis of the document "A New Method for Solving the Power Flow of a System Containing Small Impedance Branches", the power at the end points of the small impedance branch calculated according to the initial value of the voltage set by the flat start is too large, which causes the divergence of the power flow calculation of the polar coordinate Newton method. If no node power P i and Q i correction, and instead use a given injected node power P is and Q is The correction can solve the problem of divergence in power flow calculation, but it makes the algorithm logic complex and the running time is longer
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[0118] The present invention will be further described below in conjunction with the accompanying drawings. according to Figure 4 The flow chart of the polar coordinate Newton method power flow calculation is shown, and the power flow calculation is performed on an actual large-scale power grid. The actual large grid has 445 nodes and contains a large number of small impedance branches. Among them, there are 49 small impedance branches with x≤0.001, 41 small impedance branches with x≤0.0001, and 22 small impedance branches with x≤0.00001. Among them, the smallest impedance value is the small impedance branch l between node 118 and node 125 118-125 is x=0.00000001. The convergence accuracy of the power flow calculation is 0.00001. In order to verify the convergence of the present invention to calculate the small impedance branch power system containing resistance not 0, the small impedance branch l 118-125 , l 60-122 and l 287-310 The resistor is changed to r=0.0001.
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The invention discloses a polar coordinate Newton method load flow calculation method for Jacobian matrix change. Load flow calculation is divided into two stages, different methods are adopted in different stages to calculate a Jacobian matrix, and the method is called as a two-stage method. The number of iterations of the first stage is set, practice shows that when the number of iterations of the first stage is set to be two, the effect is optimal, and the operation time of load flow calculation can be effectively shortened. According to the method, the load flow calculation is carried outby adopting a two-stage method, so that the convergence problem of the load flow calculation of the polar coordinate Newton method in analyzing the power system containing the small-impedance branch is solved, and the operation time of the load flow calculation is reduced. When conventional polar coordinate Newton method load flow calculation is not convergent, reliable convergence can be achieved, and the operation time is shorter than that of the prior art. The method can effectively solve the convergence problem of the conventional polar coordinate Newton method load flow calculation analysis of the power system containing the small impedance branch, and can perform load flow calculation on the normal power system without adverse effects.
Description
technical field [0001] The invention relates to a power flow calculation method of a small-impedance branch power system, in particular to a polar coordinate Newton method power flow calculation method with Jacobian matrix changes. Background technique [0002] Power system power flow calculation is a basic calculation for studying the steady-state operation of the power system. It determines the operating state of the entire power system according to the given operating conditions and network structure of the power system. The power flow calculation is also the basis of other analysis of the power system, such as safety analysis, transient stability analysis, etc., all use power flow calculation. Due to the advantages of reliable convergence, fast calculation speed and moderate memory requirements, Newton's method has become the mainstream method for power flow calculation. Newton's method is divided into two forms: polar coordinates and rectangular coordinates. Both forms...
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Login to View More IPC IPC(8): G06F17/16G06Q50/06
CPCG06F17/16G06Q50/06
Inventor姚玉斌王珏肖炳旭
OwnerDALIAN MARITIME UNIVERSITY