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An AC insulation detection circuit, system and method

A detection circuit and detection system technology, which is applied in the measurement of electrical variables, resistance/reactance/impedance, measurement devices, etc. Effect

Active Publication Date: 2020-03-24
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides an AC insulation detection circuit, system and method to solve the problems of large system self-loss and need for heat dissipation in the prior art

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  • An AC insulation detection circuit, system and method
  • An AC insulation detection circuit, system and method
  • An AC insulation detection circuit, system and method

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Embodiment Construction

[0057]The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0058] The invention provides an AC insulation detection circuit to solve the problems of large system self-loss and need for heat dissipation in the prior art.

[0059] Specifically, see figure 1 , the AC insulation detection circuit includes: a rectifier bridge 101, a current limiting resistor R1, a controllable switch K1 and a switching power supply module 102; wherein:

[0060] The current limiting resistor R1 and the controllable switch K1 are connected in series between the input end ...

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Abstract

The present invention provides an AC insulating detection circuit, system and method, wherein the AC insulating detection circuit is characterized in that a rectifier bridge, a current-limiting resistor, a controllable switch and a switch power supply are in series connection between a power grid and the ground, so that the current-limiting resistor and an AC power grid ground insulation impedor form a bleeder circuit, and the AC power grid ground insulation impedance is calculated; at the same time, by using the rectifier bridge to substitute for a three-phase virtual unit realized by the resistor in the prior art, the problems in the prior art that the system is large in self-loss and needs to radiate heat are avoided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation control, in particular to an AC insulation detection circuit, system and method. Background technique [0002] In order to ensure the reliable operation of high-power three-phase isolation transformers and photovoltaic power plants, there is a photovoltaic power generation system and its grid-side insulation impedance detection device in the prior art, which uses resistance and inductance to realize a three-phase virtual impedance unit. The three-phase impedance in the impedance unit can generate a virtual zero line with the same potential as the actual zero line, and then cooperate with the control unit to perform calculations to realize the grid side insulation resistance detection. [0003] However, in order to improve the power density of the inverter and the power generation efficiency of the system, the DC input voltage of the photovoltaic side has been increased from 1...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 王文广冯国海
Owner SUNGROW POWER SUPPLY CO LTD
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