A power flow calculation optimization method for a power system

A power flow calculation and power system technology, which is applied to flexible AC transmission systems, AC networks with different sources of the same frequency, electrical components, etc., can solve the problem that the power flow calculation modules cannot be reused, and reduce programming workload and Effect of Minor Programming Difficulty

Active Publication Date: 2018-12-11
HOHAI UNIV
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Problems solved by technology

However, the introduction of this new type of component requires the correction of the Jacobian matrix in the solution process of the power flow calculation based on the Newton-Raphson method, which makes the existing power flow calculation module unable to be reused and requires a lot of programming work

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  • A power flow calculation optimization method for a power system
  • A power flow calculation optimization method for a power system
  • A power flow calculation optimization method for a power system

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0039] Such as figure 1 Shown is the topological equivalent circuit diagram of the unified power flow controller (UPFC) in the present invention, in which the present invention introduces a virtual node, so that the power flow therein can be expressed conveniently. figure 2 Shown is the equivalent circuit diagram of UPFC injection power. The present invention equivalently injects the equivalent power of the UPFC to the nodes at both ends, and transfers the line where the UPFC is located to between the new virtual node and the original line end node, thereby effectively The complexity of the model is reduced, which provides a basis for exploring the influence of UPFC on the injected power of system nodes.

[0040] The introduction of UPFC makes it necessary to correct the Jacobian matrix in the solution process of the power flow calculation based ...

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Abstract

The invention discloses a power flow calculation optimization method of a power system. Firstly, a virtual node is introduced into a unified power flow controller, and the function of the unified power flow controller is equivalent to injecting the equivalent power to the nodes at both ends of a line where the unified power flow controller is located, and the power balance equation of the system node is modified. Then, the convergence condition of power flow calculation is analyzed, and the objective function of the optimization model of power flow calculation is proposed. Secondly, the characteristics of power flow calculation are analyzed, and the constraint conditions of power flow calculation optimization model are put forward. Finally, computational optimization is carried out. The invention can effectively reduce the programming difficulty of the power flow calculation problem with the unified power flow controller, and provides a new solution idea for the power flow calculationproblem of the power system.

Description

technical field [0001] The invention relates to the technical field related to electric power systems, in particular to a power flow calculation and optimization method for electric power systems. Background technique [0002] The unified power flow controller (UPFC), as the most comprehensive flexible AC power transmission device, can realize fast and precise control of the power flow of the line without changing the existing grid structure of the system, thereby improving the regional power grid. Power supply capacity, has a wide range of application prospects. However, in actual engineering, in order to give full play to the control ability of UPFC, its topology and wiring mode are often more complicated, which makes the traditional UPFC steady-state model unsuitable. [0003] Power flow calculation, as the most basic analysis method for power system operation, can obtain the operating status information of the system by solving the power balance equation under the condi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/18
CPCH02J3/06H02J3/1814Y02E40/10
Inventor 卫志农朱梓荣孙国强臧海洋朱瑛
Owner HOHAI UNIV
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