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An Uncertain Harmonic Power Flow Calculation Method Applicable to Distributed Power Access

A technology of distributed power supply and harmonic power flow, which is applied to AC networks, circuit devices, and AC network circuits of the same frequency with different sources, which can solve the single uncertainty, difficult to obtain basic data, and difficult to obtain harmonic power flow. indicators and other issues, to achieve the effect of easy to grasp, accurate and reasonable calculation results

Active Publication Date: 2019-06-21
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

Establishing a realistic probability model requires a large amount of accurate basic data. In practical applications, on the one hand, it is difficult to obtain sufficient basic data under the current system hardware conditions; on the other hand, the probability model only considers a single uncertainty (randomness ), which is not enough to reflect the real situation of the information
Therefore, the existing stochastic harmonic power flow calculation method is difficult to obtain accurate harmonic power flow index

Method used

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  • An Uncertain Harmonic Power Flow Calculation Method Applicable to Distributed Power Access
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  • An Uncertain Harmonic Power Flow Calculation Method Applicable to Distributed Power Access

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] like figure 1 As shown, this embodiment provides an uncertain harmonic power flow calculation method suitable for distributed power access, specifically:

[0026] (1) For Distributed Generation (DG) with fluctuating output power, especially DG using wind energy, solar energy and other new energy sources, based on the measurement samples, use the cloud model generator to model the output power of grid-connected nodes ;

[0027] (2) According to the 3δ range of the normal cloud model, the power prediction range of the DG grid-connected node is obtained;

[0028] The specific implementation of step (1) (2) is as follows:

[0029] In the power network nodes, if the power of a certain node is uncertain, it will have an impact on the network power flow. When solving such a network power flow, the uncertain power flow algorithm is needed. First, use...

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Abstract

The invention relates to an indeterminate harmonic flow calculation method applicable to distributive power supply access. The method concretely comprises the following steps of firstly, for a distributive power supply with the fluctuation on the output power, performing modeling on the basis of a measuring sample by using the output power of a reverse cloud model generator on a gird integration node; then, solving the power prediction range of the DG gird integration node according to the 3 Delta range of a positive cloud model; then, on the basis of the obtained power range, performing indeterminate harmonic flow calculation by combining a boundary flow method; solving the power grid harmonic flow distribution; finally, judging whether the harmonic content of each node of the power grid is in a safe range or not according to the node voltage total harmonic distortion factor result. The method provided by the invention has the advantages that better inclusivity is realized on the fluctuation data; in addition, under the condition of the same operation goal and conditions, the calculation efficiency of the provided calculation method is much higher than that of a Monte Carlo method; the calculation efficiency is identical to the calculation efficiency of a probability flow method.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to an uncertain harmonic power flow calculation method suitable for distributed power access. Background technique [0002] Distributed power generation is more and more connected to the power grid. While it gradually exerts its advantages, it also brings many hazards to the power grid, including fluctuation and harmonic interference. Harmonic power flow calculation is the most direct and effective method to study the harmonic problems in power flow. Harmonic power flow calculation can calculate the harmonic voltage of each node of the power grid, the degree of harmonic distortion and the harmonic current of the branch circuit, which is the most important method for evaluating the safe operation of the power system. important basis. [0003] With the continuous growth of electricity demand, the shortage of traditional energy sources, and the opening of the electricity...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 张逸刘智煖林焱林芳张慧祥黄道姗吴丹岳陈育欣
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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