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Method and circuit for detecting insulation resistance of photovoltaic module array to ground

An impedance detection circuit and a technology of ground insulation resistance, which is applied in the field of photovoltaic module array ground insulation resistance detection, can solve the problems of inaccurate detection results and detection of blind areas

Active Publication Date: 2018-03-16
爱士惟科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the existing problems and realize the above-mentioned purpose, the present invention provides a method and circuit for detecting insulation resistance to ground to solve the problems of inaccurate detection results and detection blind spots in existing detection schemes

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  • Method and circuit for detecting insulation resistance of photovoltaic module array to ground
  • Method and circuit for detecting insulation resistance of photovoltaic module array to ground
  • Method and circuit for detecting insulation resistance of photovoltaic module array to ground

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Embodiment

[0057] Such as figure 1 As shown, a photovoltaic module array ground insulation resistance detection method, the method includes:

[0058] S1: Detection action start: When the CPU receives the system detection command signal input circuit low level continuous time is more than t1 and turns to high level, it is considered to have received the detection command (preferably t1 is 0.3S, t1 time is also visible situation settings). When the system detects that the DC voltage is greater than U1 (preferably 400V) 60s (the time can also be set according to the situation), it is considered that the detection command has been received;

[0059] S2: Sampling positive voltage divider circuit (positive bus-to-ground voltage value u1) and negative voltage divider circuit (ground-to-negative bus voltage value u2);

[0060] When u1>0, u2>0, and 0.9≤(u1 / u2)≤1.1, it is determined that the insulation resistance balance of the DC bus is similar to the balance of the bridge, and enter mode 1. At...

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Abstract

The invention discloses a detection method and circuit for ground insulation resistance of a photovoltaic module array, and therefore the problems that according to an existing detection scheme, when the difference value of positive bus ground insulation resistance and negative bus ground insulation resistance is large, many dead zones exist, and the ground insulation resistance can not be accurately detected in a full-voltage range are solved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method and circuit for detecting insulation resistance of a photovoltaic module array to ground. Background technique [0002] In today's global context where traditional energy sources are increasingly tense and the environment is deteriorating, it is becoming more and more important to find new alternative energy sources, and the use of solar energy is particularly prominent. Solar energy has always attracted people's attention because of its renewable, abundant resources, safety, and clean energy. With the improvement of photovoltaic power generation technology and the decline of application costs, photovoltaic power generation has been widely spread around the world, and under the favorable effects of various national policies, photovoltaic power generation is currently growing rapidly. [0003] Starting from the technology of photovoltaic power gener...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/10G01R27/18
CPCG01R27/18H02S50/00Y02E10/50
Inventor 黄国江张斗金张杜
Owner 爱士惟科技股份有限公司