A Fast Decomposition Method for Power Flow Calculation of Correction Coefficient Matrix

A coefficient matrix and correction coefficient technology, applied in the field of fast decomposition method power flow calculation, can solve problems such as divergence, and achieve the effect of improving convergence problems

Inactive Publication Date: 2017-08-08
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0058] The method proposed in the Chinese patent ZL201410314990.6 effectively improves the convergence of the power flow calculation of the power system with small impedance branches, but when the resistance of the small impedance branches is large (r ij >>x ij ), the method may still diverge

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  • A Fast Decomposition Method for Power Flow Calculation of Correction Coefficient Matrix
  • A Fast Decomposition Method for Power Flow Calculation of Correction Coefficient Matrix
  • A Fast Decomposition Method for Power Flow Calculation of Correction Coefficient Matrix

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Embodiment Construction

[0098] Below in conjunction with accompanying drawing, the present invention is further described, according to figure 2 The flow shown is calculated for two examples of IEEE14-node system (Institute of Electrical and Electronics Engineers 14-node system test data) and a 445-node actual system. As a comparison, the conventional fast decomposition method and the existing patented algorithm are used for this example Calculated. The convergence accuracy of the power flow calculation is 0.00001.

[0099] The two conventional fast decomposition methods are:

[0100] Conventional Algorithm 1: Perform P~θ iterations first, and then Q~V iterations;

[0101] Conventional Algorithm 2: Perform Q~V iterations first, and then P~θ iterations;

[0102] Existing patent algorithm: the method proposed by patent ZL201410314990.6.

[0103] Figure 5 It is an IEEE14 node system. In order to verify the influence of the small impedance branch on the convergence of the algorithm, the branch bet...

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Abstract

The invention discloses a power flow calculation method of the fast decomposition method of the correction coefficient matrix, which adopts the method of performing Q~V iterations first, and then performing P~θ iterations, and corrects some elements of the coefficient matrix B' of the P~θ iteration correction equation to modify. When forming the coefficient matrix B', the reactance of the small impedance transformer branch is multiplied by a correction factor α, and the reactance of the normal branch is not multiplied by this correction factor. The invention improves the convergence problem of the rapid decomposition method power flow calculation in analyzing the small impedance branch system with relatively large resistance by modifying some elements related to small impedance in the correction equation coefficient matrix B'. When the conventional fast decomposition method is used for power flow calculation or the existing patented algorithm does not converge, the present invention can reliably converge. Because the present invention can not only effectively solve the convergence problem of conventional rapid decomposition method power flow algorithm analysis containing small impedance branch systems with large resistance, but also can perform power flow calculation on normal systems, so there is no adverse effect.

Description

technical field [0001] The invention relates to a fast decomposition method power flow calculation method of an electric power system, in particular to a fast decomposition method power flow calculation method suitable for a small impedance branch system. 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 network according to the given operating conditions and network structure. Power flow calculation is also the basis of other power system analysis, such as safety analysis, transient stability analysis and so on. Due to the advantages of reliable convergence, fast calculation speed and less memory requirement, the fast decomposition method has become one of the mainstream algorithms for power flow calculation. [0003] When there is no small-impedance branch in the power network or the resistance of the small-impedance branch in...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06F17/50
Inventor姚玉斌阳义青吴志良王丹
OwnerDALIAN MARITIME UNIVERSITY