Network loss equivalence load model-based power flow calculation initial value setting method

A load model and initial value technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as large difference in active power distribution, no consideration of branch resistance active power loss, etc., to achieve clear physical meaning and improve power flow convergence. Intuitive and simple effect of performance and indicators

Inactive Publication Date: 2016-11-16
CHINA ELECTRIC POWER RES INST +2
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  • Application Information

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Problems solved by technology

However, the commonly used DC power flow calculation method (i.e. the standard DC power flow calculation method) does not consider the active power loss caused by the branch resistance, and the active power distribution may be quite different from the actual power flow.

Method used

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  • Network loss equivalence load model-based power flow calculation initial value setting method
  • Network loss equivalence load model-based power flow calculation initial value setting method
  • Network loss equivalence load model-based power flow calculation initial value setting method

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041]The method for setting the initial value of the Newton method power flow calculation in the present invention first performs the DC power flow calculation based on the network loss equivalent load model; As the initial value of the voltage amplitude, the PQ node takes 1.0p.u. The evaluation of the results, and finally given the initial value of the Newton method power flow calculation. The method combines the advantages of fast DC power flow calculation and no convergence problem, overcomes the defect of large active power distribution error caused by ignoring network loss in standard DC power flow calculation, and retains the relatively simple and efficient fast decoupling method. The advantage provides a better initial value of Newton's method power flow.

[0042] The overall flow chart of this implementation is as follow...

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Abstract

The invention provides a network loss equivalence load model-based power flow calculation initial value setting method, which comprises the steps of carrying out network loss equivalence load model-based DC power flow iteration calculation on a power grid to obtain a DC power flow voltage phase angle phasor theta*<DC> of a power grid node; by employing the theta*<DC> as an initial value of a node voltage phase angle, calculating a voltage amplitude estimation value phasor V*<F> and a phase angle estimation value phasor theta*<F> of the node through a quick decoupling method; and evaluating the voltage amplitude estimation value phasor V*<F> and the phase angle estimation value phasor theta*<F>, calculated through the quick decoupling method, of the node to obtain a newton method power flow initial value. The network loss equivalence load model-based power flow calculation initial value setting method is conducive to improvement of the power flow convergence and has the advantages that DC power flow calculation is free of a convergence problem and calculation through the quick decoupling method is relatively simple.

Description

technical field [0001] The invention relates to the field of power flow calculation, in particular to a method for giving an initial value of power flow calculation based on a network loss equivalent load model. Background technique [0002] The essence of power flow calculation is to solve a set of high-order power flow equations. When the power flow calculation converges normally, the power flow results are generally accurate enough. However, due to the characteristics of the nonlinear equation itself, the calculation speed is slow when the network scale is large, and the calculation The process is prone to non-convergence. Newton's method is still a widely used power flow algorithm at present. It expands the power flow equation with Taylor series, and omits higher-order terms above the second order, and then solves it. Its essence is successive linearization, and the core of the solution process is to repeatedly form and solve the correction equation. Iterate until conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 王毅王虹富董毅峰侯俊贤陶向红邵宝珠仲悟之汤涌宋新立刘道伟刘涛叶晓晖王铁柱张志强刘燕嘉
Owner CHINA ELECTRIC POWER RES INST
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