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Photovoltaic system ground-fault resistance detection and location method

A photovoltaic system and ground fault technology, which is applied in the field of photovoltaic system ground fault resistance detection and positioning, to save labor costs and shorten troubleshooting time

Inactive Publication Date: 2018-10-12
上海岩芯电子科技有限公司
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Problems solved by technology

[0004] The invention provides a photovoltaic system ground fault resistance detection and positioning method, aiming to solve the problem of accurately locating the fault location when a ground fault occurs in the photovoltaic system

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  • Photovoltaic system ground-fault resistance detection and location method
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Embodiment Construction

[0023] In order to describe the present invention more specifically, preferred embodiment is hereby described in detail in conjunction with accompanying drawings as follows:

[0024] Such as figure 1 As shown, the embodiment of the present invention provides a photovoltaic system ground fault resistance detection and location method, including the following steps:

[0025] Step A: Obtain the impedance value of the resonance point of the positive and negative wiring of the photovoltaic system.

[0026] Such as image 3 Shown is the block diagram of photovoltaic system ground fault resistance prediction and its positioning method. The impedance value of the resonance point is measured by an AC impedance measurement device and connected to the photovoltaic system through capacitive coupling.

[0027] Connect the AC impedance measuring devices P and N to the positive DC bus 0 of the photovoltaic system and the ground G to obtain the impedance value Z of the positive resonance p...

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Abstract

The invention provides a photovoltaic system ground-fault resistance detection and location method, comprising the following steps: connecting an alternating-current impedance measuring device with aphotovoltaic system through a capacitive coupling, and measuring photovoltaic system positive and negative wiring resonance point impedance values ZP and ZN and a photovoltaic system self-resonance point impedance value Zall through different connection methods; assuming that the photovoltaic module resonance point impedance values are the same, calculating to obtain a photovoltaic component resonance point impedance value Zavr; according to the positive and negative resonance point impedance values and the photovoltaic system resonance point impedance value and the photovoltaic module resonance point impedance values, calculating a ground-fault resistance value Rfault and a ground-fault location l. The photovoltaic system ground-fault resistance detection and location method does not needto additionally arranging sensors, does not depend on the fault current value, realizes the ground-fault resistance prediction and fault location according to the impedance characteristics of the photovoltaic system, and has certain significances for shortening the fault checking time and lowering the labor cost.

Description

Technical field: [0001] The invention belongs to the field of photovoltaic system fault location, in particular to a photovoltaic system ground fault resistance detection and location method. Background technique: [0002] Photovoltaic power generation has been paid attention to because of its clean and pollution-free advantages, and has been able to develop rapidly. With the growth of photovoltaic power generation systems, fire accidents in photovoltaic power stations have attracted the attention of the industry. The analysis found that the ground fault was one of the main culprits leading to the fire. Such as figure 2 The electrical connection diagram of the photovoltaic system is shown. Under normal working conditions, the exposed metal conductors (such as module frames, metal casings, and mounting brackets) do not carry current and are reliably connected to the earth. figure 2 The middle dotted line represents the earth. A ground fault occurs when a low-resistance pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00
CPCH02S50/00Y02E10/50
Inventor 黄建明
Owner 上海岩芯电子科技有限公司
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