Photovoltaic system direct-buried cable current-carrying type selection method

A photovoltaic system and cable technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as many influencing factors, difficult calculations, and inability to be widely used

Pending Publication Date: 2022-03-08
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Photovoltaic power generation system is a typical periodic load. Although the relevant specifications specify the calculation of the cable load factor under the periodic curve, the calculation formula in the specification is abstract and complicated, and cannot be widely used in actual projects.
For photovoltaic system direct buried cables, the periodic load carrying capacity coefficient is related to soil thermal resistance coefficient, ambient temperature, number of loops, loop spacing, and laying depth, etc. There are many influencing factors and difficult to calculate

Method used

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  • Photovoltaic system direct-buried cable current-carrying type selection method
  • Photovoltaic system direct-buried cable current-carrying type selection method
  • Photovoltaic system direct-buried cable current-carrying type selection method

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Embodiment 1

[0042] Embodiment 1, simulation method

[0043] In this embodiment, the present invention confirms the minimum load factor under the typical daily load curve through the simulation method, finally obtains the ampacity, and selects the cable accordingly.

[0044] The current-carrying capacity selection method of direct-buried cables for photovoltaic systems based on cyclic load curves includes the following steps:

[0045] (1) According to the hourly data of Pvsyst, the daily load cycle curve of the cable flowing in the photovoltaic system is fitted.

[0046] A typical load cycle curve is a sine wave. According to the Pvsyst simulation data, the limited hours can be confirmed, and the daily cycle load curve function can be approximately confirmed according to formulas (1)-(3).

[0047] (2) Based on the confirmed daily load cycle curve and the actual laying environment and configuration of the direct buried cable, calculate the steady-state ampacity Ir of the cable (IEC 60287 m...

Embodiment 2

[0071] Embodiment 2, look-up table method,

[0072] The table look-up method of the present invention is based on the results of the above-mentioned simulation method. When the thermal resistance varies between 0.8-2K.m / W, the number of loops varies between 1-4 loops, and the laying depth varies between 0.8-2m, the cable From three cores 70mm 2 ~400mm 2 When the distance between cables varies between 200 and 500, only the number of loops and the influence of thermal resistance coefficient on the M value are considered, the operation steps are simplified, it is convenient for practical engineering applications, and the cable cross section is effectively reduced to reduce the cable cost.

[0073] Taking the 35kV photovoltaic system as an example, the current-carrying capacity selection method of the 35kV direct-buried cable of the photovoltaic system based on the periodic load curve includes the following steps:

[0074] (1) Similar to the simulation method, first confirm the ...

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Abstract

The invention relates to a direct-buried cable current-carrying type selection method for a photovoltaic system. The method comprises the following steps: firstly, fitting a daily load period curve flowing through a cable in the photovoltaic system according to Pvsyst per hour data on the basis of the periodic load characteristic of the photovoltaic system; and then based on the confirmed daily load period curve and the actual laying environment and configuration of the buried cable, a cable period load factor is calculated through software (CYMCAP or the like), a cable current peak value under the period load is confirmed, and therefore the calculation method suitable for photovoltaic system buried cable type selection is provided. The invention further provides a 35kV direct-buried cable load factor M value table look-up method, the minimum value of M is confirmed, practical engineering application is facilitated, the cable section is effectively reduced, and therefore the cable cost is reduced.

Description

technical field [0001] The invention belongs to the field of photovoltaic system design, and in particular relates to a type selection method and application of the current-carrying capacity of a directly buried cable of a photovoltaic system. Background technique [0002] With the large-scale development of my country's photovoltaic power generation industry, how to effectively reduce the total cost of photovoltaic power station construction has become a major focus of the new energy industry. As an important part of the photovoltaic power generation system, the cost of cables accounts for a large proportion of the overall cost of photovoltaic projects. Therefore, optimizing the selection of cable models during design can greatly reduce the construction cost of the project while meeting safety regulations. [0003] In power design, the selection of cable type is usually based on the analytical calculation of cable ampacity. As a commonly used cable selection in photovoltai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/16
CPCG06F30/20G06F2113/16
Inventor 李华杨文斌施朝晖陈晴李久伟郦洪柯傅春翔王思逸陈海勇曹家兴黄可熠马润泽
Owner POWERCHINA HUADONG ENG COPORATION LTD
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