Fast decoupled flow calculation method of modified coefficient matrix

A technology of coefficient matrix and correction coefficient, which is 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: 2015-09-09
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 s

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  • Fast decoupled flow calculation method of modified coefficient matrix
  • Fast decoupled flow calculation method of modified coefficient matrix
  • Fast decoupled flow calculation method of modified 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 fast decoupled flow calculation method of a modified coefficient matrix. The fast decoupled flow calculation method of the modified coefficient matrix comprises the steps of: adopting a way of firstly performing Q-V iteration and then performing P-theta iteration, and modifying partial elements of a coefficient matrix B' of the modified equation of P-theta iteration; multiplying reactance of a low-impedance transformer branch with a correction factor alpha and not multiplying the reactance of a normal branch with the correction factor. By modifying partial elements related to the small reactance in the modified equation coefficient matrix B', the convergence problem of the fast decoupled flow calculation method when being used for analyzing a relatively high resistance containing low-impedance branch system is improved. When convergence is failed by adopting the conventional fast decoupled flow calculation or the conventional patent algorithm, the fast decoupled flow calculation method can realize convergence reliably. As the fast decoupled flow calculation method can effectively solve the convergence problem of conventional fast decoupled flow calculation method which is used for analyzing the relatively high resistance containing low-impedance branch system and also can perform flow calculation on a common system, no negative influence is generated.

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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IPC IPC(8): G06F17/50
Inventor 姚玉斌阳义青吴志良王丹
Owner DALIAN MARITIME UNIVERSITY
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