Fast decoupled power flow calculation method for serially compensating power grid containing small impedance branches

A series compensation and power flow calculation technology, applied in circuit devices, AC network circuits, AC networks with the same frequency from different sources, etc., can solve problems such as time increase and memory usage increase

Inactive Publication Date: 2017-06-16
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

However, this method needs to add more nodes and branches, which increases the memory usage and the time of each iteration. If there are many small impedance branches in the system, the memory usage and the increase value of each iteration time will decrease. more obvious

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  • Fast decoupled power flow calculation method for serially compensating power grid containing small impedance branches
  • Fast decoupled power flow calculation method for serially compensating power grid containing small impedance branches
  • Fast decoupled power flow calculation method for serially compensating power grid containing small impedance branches

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[0147] Below in conjunction with accompanying drawing, the present invention is further described, according to Figure 2-3 The flow shown is calculated for two calculation examples of the IEEE14-node system (test data of the Institute of Electrical and Electronics Engineers 14-node system) and a 445-node actual system. The calculation example is calculated, and the sparse matrix technology and node optimization numbering technology are used in each calculation method. The convergence precision ε of power flow calculation is 0.00001.

[0148] The 2 traditional methods and 1 existing patented method are:

[0149] Traditional method 1: In the traditional XB fast decomposition method, P~θ iterations are performed first, and then Q~V iterations are performed.

[0150] Traditional method 2: the traditional XB fast decomposition method, but first perform Q~V iterations, and then P~θ iterations.

[0151] Existing patent method: the method proposed by patent ZL201611130439.1.

[0...

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Abstract

The invention discloses a fast decoupled power flow calculation method for serially compensating a power grid containing small impedance branches. Before power flow calculation is carried out, the small impedance branches of which resistance values are greater than reactance absolute values are first processed, and each small impedance branch is changed into a form of serially connecting the two branches, wherein impedance of one branch is that z1 equals to the sum of r, and j (x+xav), the impedance of the other branch is that z2 equals to -jxav, and the xav is a normal reactance mean of a power system. One small impedance branch is changed into two branches with greater impedance by serial compensation, so that the astringency of power flow calculation can be improved; the small impedance branches with any impedance can be calculated. According to the fast decoupled power flow calculation method disclosed by the invention, the small impedance branch with r being greater than an absolute value of x is only compensated, and the number of newly-added nodes and branches is effectively reduced; compared with an existing patent method, the fast decoupled power flow calculation method has the advantages that memory occupancy is less and the calculation speed is higher; data are preprocessed and power flow calculation procedures do need to be changed.

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 power system according to the given operating conditions and network structure. 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 less memory requirements, the fast decomposition method has become one of the mainstream methods for power flow calculation. [0003] When there is no small impedance branch in the power system or the resistanc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 姚玉斌阳义青
Owner DALIAN MARITIME UNIVERSITY
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