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A fast decomposition method power flow calculation method suitable for branch systems with small impedance

A technology of power flow calculation and small impedance, applied in the direction of calculation, circuit device, AC network circuit, etc., can solve problems such as non-convergence of calculation

Inactive Publication Date: 2016-02-24
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

Small impedance branches are ubiquitous in power systems. The convergence of power flow calculations is the most important indicator for nonlinear problems such as power flow calculations. If the calculations do not converge, the solution to the problem cannot be obtained.

Method used

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  • A fast decomposition method power flow calculation method suitable for branch systems with small impedance
  • A fast decomposition method power flow calculation method suitable for branch systems with small impedance
  • A fast decomposition method power flow calculation method suitable for branch systems with small impedance

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Embodiment Construction

[0164] The present invention will be further described below in conjunction with the accompanying drawings. Figure 4 It is an IEEE 14-node system (the test data of the Institute of Electrical and Electronics Engineers 14-node system). In order to verify the influence of small impedance branches on the convergence of the algorithm, the branch between node 4 and node 7 in the example 47 Change to small impedance branch, branch l 47 The transformation ratio k=0.978, located on the node 4 side. according to figure 2 The flow shown in the figure calculates the IEEE14-node system calculation example, and uses two conventional fast decomposition methods to calculate the calculation example at the same time as a comparison.

[0165] The two conventional fast decomposition methods are:

[0166] Conventional Algorithm 1: Perform P~θ iterations first, and then Q~V iterations;

[0167] Conventional Algorithm 2: Perform Q~V iterations first, and then P~θ iterations.

[0168] The fol...

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Abstract

The invention discloses a rapid decomposing method load flow calculating method suitable for a branch system comprising small impedance. The method comprises the step of inputting original data and initializing voltage, the step of forming a node admittance matrix, the step of forming a coefficient matrix B' and a coefficient matrix B'' of a modified equation and decomposing a factor table, the step of setting iteration count and a convergence mark, the step of calculating the inactive power unbalance amount delta Q, the step of judging whether the absolute value delta Qmax is smaller than the convergence accuracy epsilon or not, the step of calculating the active power unbalance amount delta P, the step of judging whether the absolute value delta Pmax is smaller than the convergence accuracy epsilon or not, the step of calculating the balance node power and the inactive power of a PV node, and the step of calculating the branch power. Part of elements in the coefficient matrix B' of the modified equation of a rapid decomposing method are modified, and the convergence problem produced during analyzing the branch system comprising the small impedance with the resistance not equal to zero in rapid decomposing load flow calculation is solved. When a convention method is adopted to calculate non-convergence, the rapid decomposing method load flow calculating method can carry out convergence reliably.

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] For a normal power network or a small impedance branch network with zero resistance, the power flow calculation...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 姚玉斌王丹吴志良
Owner DALIAN MARITIME UNIVERSITY
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