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Load flow calculation method with small-impedance power grid serial-connection compensation right-angle coordinate Newton method

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

Inactive Publication Date: 2017-05-31
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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  • Load flow calculation method with small-impedance power grid serial-connection compensation right-angle coordinate Newton method
  • Load flow calculation method with small-impedance power grid serial-connection compensation right-angle coordinate Newton method
  • Load flow calculation method with small-impedance power grid serial-connection compensation right-angle coordinate Newton method

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[0147] Below in conjunction with accompanying drawing, the present invention is further described, according to Figure 2-3 The shown process calculates two calculation 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 traditional method and the method proposed by the existing patent ZL201611131677. This 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] Figure 5 It is an IEEE14-node system. In order to verify the influence of the small-impedance transformer branch ratio k on the convergence of various methods, the branch between node 4 and node 7 in the example l 4-7 Change to small impedance branch, branch l 4-7 The impedance z=10 -6 +j10 -9 , the transformation ratio k is located on the node ...

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Abstract

The invention discloses a load flow calculation method with a small-impedance power grid serial-connection compensation right-angle coordinate Newton method. Before load flow calculation, small-impedance branches except those of which nodes at two ends are both PQ nodes and a branch transformation ratio k is 1 are firstly processed, then the small-impedance branches can be transformed into a mode that two branches are serially connected, the impedance of one branch is z1=r+j(x+xav), the impedance of the other branch is z2=-jxav, and xav is a normal reactance mean value of a power system. Through serial-connection compensation, small impedance can be transformed into two branches with relatively large impedance, so that the astringency of load flow calculation can be improved. Meanwhile, as serial-connection compensation on small-impedance branches of which nodes at two ends are both PQ nodes and the branch transformation ratio k is 1 are not implemented, the number of new nodes and branches can be effectively reduced, furthermore the memory space can be reduced, and the calculation speed can be increased. The load flow calculation method is applicable to transformation of conventional load flow calculation procedures.

Description

technical field [0001] The invention relates to a power flow calculation method of a power system with a small impedance branch, in particular to a power flow calculation method of the Cartesian coordinate Newton method of the power 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 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. B...

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20Y02E40/30
Inventor 姚玉斌赵红吴志良
Owner DALIAN MARITIME UNIVERSITY
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