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Probability load flow calculation method considering unit random fault

A technology of probabilistic power flow calculation and random failure, applied in calculation, special data processing application, instrument, etc.

Active Publication Date: 2014-08-20
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In the conventional semi-invariant power flow calculation, unit faults are often described by the 0-1 distribution of node injected power, which will cause large errors in the AC power flow model

Method used

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  • Probability load flow calculation method considering unit random fault
  • Probability load flow calculation method considering unit random fault
  • Probability load flow calculation method considering unit random fault

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0047] Refer to attached figure 1 : Flowchart of the main calculation steps of the probabilistic power flow considering the random failure of the unit. In the figure, the working functions of each module are as follows:

[0048] 1. Basic data preparation, including power grid model, equipment parameters, bus load probability distribution description, unit output and forced outage rate, etc.;

[0049] 2. According to the probability distribution characteristics of the bus load, calculate the semi-invariant variables of each order.

[0050] 1) Firstly, the origin moment is obtained from the probability distribution characteristics of the bus load.

[0051] For a random variable with continuous distribution, if the density function of the random variable X is ζ(x), then its r-order origin moment α r It can be obtained by the following formula:

[0052] ...

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Abstract

The invention provides a probability load flow calculation method considering a unit random fault. The method comprises the steps that load flow calculation basic data are prepared; the semi-invariant of a bus load is computed; an event group of the unit random fault is selected, the node voltage and the probability distribution of branch load flow during each event in the event group are solved; the node voltage and the probability distribution of branch load flow considering the unit random fault are solved; and results are output. According to the method, an alternating-current load flow model is used, determinacy load flow analysis and a total probability theory are combined, errors caused by the unit fault in a conventional semi-invariant method are avoided, and computing efficiency is improved by limited selecting of the unit random fault group. According to the method, the accuracy of probability load flow calculation through the semi-invariant method is improved, high computing efficiency is achieved, a power grid operation state is disclosed comprehensively and deeply, and more effective information is provided for power grid planning and operation decision making.

Description

technical field [0001] The invention relates to a method for calculating a probability flow, in particular to a method for calculating a probability flow considering random faults of a unit. Background technique [0002] Power flow calculation is the most widely used, basic and important electrical calculation in the power system. It is a basic electrical calculation to study the steady-state operation of the power system. Operating status, such as voltage on each bus, power distribution in the network, power loss, etc. [0003] At present, the conventional power flow algorithm has been very perfect. Among them, the Newton-Raphson method and the fast decoupling method are representative. Newton's method has the advantages of high calculation accuracy and good convergence performance. The fast decoupling method combines the characteristics of the power system to decouple and simplify the pure mathematics Newton's method, so that it can improve both memory requirements and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 张传成戴赛丁强许丹蔡帜闫翠会董炜韩彬朱翊门德月李森
Owner STATE GRID CORP OF CHINA
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