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Power cable selection method of photovoltaic power station

A technology for power cables and photovoltaic power stations, applied in the field of photovoltaic power generation, can solve problems such as waste of resources, and achieve the effects of avoiding waste, calculating accurate and reasonable, and reducing cross-sectional area.

Pending Publication Date: 2022-03-01
NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cable cross-section selected with the maximum working current can certainly meet the engineering requirements, usually the maximum output of the photovoltaic power generation system in a day only occurs in the best 3-4 hours of sunshine, and the current flowing in the cable during the rest of the time is much less than The maximum operating current, according to the existing selection method of the conductor section of the power cable, causes a waste of resources to a large extent

Method used

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  • Power cable selection method of photovoltaic power station
  • Power cable selection method of photovoltaic power station
  • Power cable selection method of photovoltaic power station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A power cable selection method for a photovoltaic power station, comprising the following steps:

[0037] S1: Check the national specification or cable information to obtain the theoretical allowable steady-state current I of the proposed cable R ;

[0038] S2: Multiply the load carrying capacity coefficient M and the laying conditions by the theoretical allowable steady-state current of the proposed cable, and correct it to obtain the actual allowable load current of the proposed cable; among them, the laying conditions include temperature coefficient and soil thermal resistance coefficient and laying factor;

[0039] S3: Obtain the maximum working current data of the cable to be selected;

[0040] S4: Compare the actual allowable load current of the cable to be selected with the maximum operating current data of the cable to be selected;

[0041] S5: If the actual allowable load current of the cable to be selected is not less than the maximum working current data o...

Embodiment 2

[0069] A power cable selection method for a photovoltaic power station, characterized in that it comprises the following steps:

[0070] 1) Comprehensively analyze the load change law of photovoltaic power generation system;

[0071] Use software or other methods to obtain the annual hourly power generation output data of photovoltaic power plants; analyze the data and calculate the total power generation per day for 365 days of the year (366 days for leap years); select the data of the day with the largest power generation output as The harshest conditions for cable selection.

[0072] 2) Calculate the periodic load loss factor of the photovoltaic power generation system;

[0073] The invention is based on the international standard of IEC 60853-1 "Calculation of Current Rating for Periodic Nuclear Accidents of Cables Part 1: Factors of Periodic Rating of Cables at 18 / 30 (36) kV and Below". The calculation scheme is applicable to direct burial or buried pipeline laying of a...

Embodiment 3

[0098] The following takes the 35kV AC cable selection design of a photovoltaic power station as an example to illustrate.

[0099] 1) For a photovoltaic project, 540Wp double-sided monocrystalline silicon photovoltaic modules are selected for photovoltaic modules, 26 photovoltaic modules are connected in series to form a string, and fixed and adjustable brackets. The rated capacity of the box-inverter integrated machine is 3125kW, and the high-voltage side voltage is 35kV. Every six box-inverter integrated machines are connected in series to form a collector line, which is sent to the step-up station through a 35kV cable. Cable ZRC-YJLY23-26 / 35-3x240.

[0100] Calculated by the software, the hourly output of the power station on the day of maximum output under clear and cloudless conditions is shown in Table 1:

[0101] Table 1 Hourly output data of a certain power station on the day of maximum output under sunny and cloudless conditions

[0102]

[0103]

[0104] 2) ...

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Abstract

The invention discloses a power cable selection method for a photovoltaic power station. The power cable selection method comprises the following steps: S1, obtaining theoretical allowable steady-state current of a to-be-selected cable; s2, correcting the theoretical allowable steady-state current by adopting a load current-carrying capacity coefficient M and a laying condition to obtain an actual allowable load current; s3, obtaining the maximum working current data of the to-be-selected cable; s4, comparing the actual allowable load current with the maximum working current data; s5, if the actual allowable load current is not smaller than the maximum working current data, determining that the selected cable meets the engineering requirements; and S6, if the actual allowable load current is smaller than the maximum working current data, reselecting the power cable, and repeating the processes from S1 to S4 until the process of S5 is satisfied, thereby completing the selection of the power cable. According to the method, selection of the power cable is more reasonable, the sectional area of the selected power cable is effectively reduced under the condition that the temperature rise requirement is met, the current-carrying capacity of the power cable is fully utilized, and the engineering cost is controlled.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and relates to a method for selecting a power cable of a photovoltaic power station. Background technique [0002] In the operation of power cables, the rated current carrying capacity refers to the maximum operating current corresponding to the temperature of the insulation layer of the power cable when it does not exceed the rated value during long-term operation. During the actual operation of the cable, the load current of the power cable generally changes periodically, and a peak-valley cycle will be formed within 24 hours a day. When the load changes from the trough to the peak, the temperature of the cable conductor will increase with the increase of the load, and the conductor temperature will reach the maximum value when it is close to the peak value of the load current. The operating temperature is much lower, so when operating under cyclical conditions, the power cable can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/17G06F113/16
CPCG06F30/20G06F30/17G06F2113/16
Inventor 梁铮张欢畅黄一凡康博
Owner NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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